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Microcomputer intelligent quasi-synchronized controller
产品型号： PTQ2000C

In the power system, the parallel operation of synchronous generators and the grid connection of the line are often carried out. In order to ensure the safe and rapid integration of the equipment into the grid, a quasi-synchronized controller must be used.
PTQ2000C microcomputer intelligent qua...

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Features
◆In the working mode of the generator, the parallel generator is automatically adjusted in frequency and voltage in the selected way, and the predicted closing phase angle reaches the set value with the selected lead. The closing pulse (command) is issued before the time tdq to complete the parallel operation. The phase difference indicator light directly indicates the phase relationship between the generator and the power grid. If the synchronization is successful, the indicator light will stay on the synchronization point, and soon (software) will be blocked and turned into a standby state. The synchronization feedback switch signal is used as a hardware lock to prevent The channel of the gate is adjusted and closed again due to misoperation. If it is unsuccessful, the indicator light will not stay on the synchronization point, and the frequency modulation function will be activated soon (about 2 seconds) (the voltage regulation will not be activated for the time being), and the next synchronization control will be automatically activated after 12 seconds. If the parameters are modified during the period, the synchronous control is not allowed, and the control is allowed after the parameters are modified for at least 2 seconds. During the blocking period, the device is in a standby state and will not be put into operation again until a restart command or channel switching command is received.
◆In the working mode of line difference frequency and grid connection, the device completes the measurement of frequency difference (including the same frequency) and pressure difference. And use the switch mode to give "large frequency difference", "same frequency", "large pressure difference" and other signals. When the frequency difference (the setting value is smaller than that of the generator working mode) and the differential pressure conditions are satisfied, it is predicted that the closing phase angle reaches the set value like the generator working mode, and the closing command is issued at the selected lead time to complete the parallel connection. operate.
◆In the working mode of line co-frequency and grid connection, the device detects co-frequency, pressure difference and power angle, and gives "same frequency", "large pressure difference", "power angle" Angle over limit" and other switch signals. And accept the modification of parameters such as power angle by the host computer or panel at any time. Under the condition of the same frequency, when the pressure difference and power angle conditions are satisfied, the closing command is issued to complete the parallel operation.
◆In the generator working mode, the frequency modulation circuit adopts variable parameter pulse width adjustment, and the basic pulse width can be set by the user. Track the grid frequency when the grid is normal, and lock to 50Hz when the grid is abnormal or the grid is offline. In addition to the variable parameter adjustment, the frequency also has an acceleration limit and a low-speed (<43Hz) adjustment total limit. The adjustment function can be manually released.
◆In the generator working mode, the voltage regulating circuit does not work when the generator frequency is GF<43Hz, when the generator itself fails, it does not work during closing detection. When the power grid is abnormal or the power grid is disconnected, the rated voltage is locked, and the voltage is adjusted normally at 46Hz to 54Hz. There are two kinds of voltage regulation methods: analog (pulse width) regulation and digital regulation, and digital regulation has two kinds of counting regulation and special pulse width regulation, which are all variable parameter regulation. The adjustment function can also be manually released. The analog adjustment is suitable for the excitation given by the multi-turn potentiometer driven by the servo motor, and the digital adjustment is suitable for the digital excitation device or the excitation device with the digital potentiometer given. Count adjustment is similar to multiple quick presses
Move the plus and minus keys of the digital potentiometer, which is intuitive but the relay action is too frequent; the special pulse width adjustment is similar to properly pressing the plus and minus keys of the digital potentiometer for a period of time to connect Add and subtract functions.
◆When working normally, the highest digit of the digital tube displays the channel number. The second digit is used as an auxiliary display. It displays (F) when it displays frequency-related content; displays (U) when it displays voltage-related content; displays (P) when it displays phase-related content; displays frequency difference, voltage difference, and phase difference (-) is displayed if a negative sign appears. The remaining lower four bits are used to display the content. It can display the frequency of generator (to be paralleled), generator voltage, grid (system side) frequency, grid voltage, frequency difference between generator and grid, voltage difference between generator and grid, and phase difference between generator and grid. You can use the plus and minus keys to cycle selection, and the corresponding auxiliary indicator lights are lit to make the meaning very clear.
If the generator frequency is displayed, the auxiliary indicators of "Generator" and "Frequency" will be on at the same time; if the voltage difference between the generator and the grid is displayed, the "Generator" , "Grid", "Voltage" auxiliary indicator lights at the same time. other similar.
◆This device can set parameters on site. Except for some common parameters, each channel has its own parameters. Press the parameter key once to enter the parameter setting state, the parameter light is on, usually start from parameter 11 (1# channel working mode selection), and press it again to exit the parameter setting. See Section 7 for specific operations, and Section 3 for parameter meanings.
◆This device can quickly and accurately capture the first closing timing, and can choose automatic closing, automatic + manual approval, and manual closing. There is also an option to have a voltageless closing function (using an approved key to close).
◆This device has various fault detection functions:
(A) Generator offline or no voltage (generator voltage and frequency are displayed as 0)
(B) Grid disconnection or no voltage (grid voltage and frequency are displayed as 0)
(C) Grid frequency deviation>1.5Hz (see grid frequency display)
(D) Abnormal grid voltage (over, under voltage, see grid voltage display)
(E) Generator frequency deviation>4Hz (except when starting, see display)
(F) Generator overvoltage (see generator voltage display)
(G) channel fault (transmitted by PFX-1 splitter) These faults are not allowed to issue synchronous closing command!
◆This device uses the speed-up, deceleration, boost, and step-down relays under the generator working mode to send out "large frequency difference" and "same frequency" in the line working mode. ”, “large pressure difference”, “power angle exceeding limit” and other on-site information. When the line difference frequency is connected to the grid, the first three information are mainly meaningful. "Power angle exceeds the limit" means "lead angle has not yet met the requirements". This information is for reference only, as long as there is a 5-frequency difference pilot angle. Meet the requirements. When the lines are connected to the grid at the same frequency, the last three pieces of information are mainly meaningful.
◆This device generally works with PFX-1 splitter, and the communication between them uses serial half-duplex RS-485; if there is a host computer or system network, this The communication line is sent to the host computer at the same time to form a communication network with PTQ2000C as the main machine and PFX-1 splitter and the host computer as the auxiliary machine. The baud rate is optional from 1200 to 9600, but the three parties must choose the same. Communication content is mainly "command", "response", "parameter", "data" and so on. The communication protocol imitates the remote communication "RTU mode". In addition, we have developed a dedicated communication module PTX-1R, through which the host computer or system network communicates with PTQ2000C. The communication protocol completely complies with the regulations of "MODBUS", and there are "RTU mode" and "ASCⅡ mode" optional, please refer to the PTQ2000C communication software manual for details. .
◆ In addition to serial communication between the device and the PFX-1 splitter, it is also necessary to connect the “generator” and “grid” PT voltage signals and relay output on the hardware. The "synchronization", "speeding up", "deceleration", "boosting" and "stepping down" lines are connected, and the "synchronization feedback" input should also be connected when needed (this signal is used to measure the lead time, auxiliary closing atresia).

technical parameter
parameter 0, debugging parameter, generator (to be paralleled) voltage measurement correction, it is used to correct the manufacturing error of the generator voltage measurement circuit, users generally cannot enter this parameter. When debugging, first enter this parameter, the setting range of this parameter is ±12.5%, and the setting accuracy is 0.1%, but this parameter itself is not displayed, but the measured value of generator voltage is displayed, so as long as this parameter is adjusted so that the displayed value is the same as the actual value That's it, very convenient. Note that if the difference between the displayed value and the actual value exceeds ±8%, it is better to modify the measured voltage divider resistance first, and then adjust this parameter.
◆Parameter 1, debugging parameters, grid (system side) voltage measurement correction, which is used to correct the manufacturing error of the grid voltage measurement circuit. Similarly, the user cannot enter, and the others are similar to parameter 0.
◆ Parameter 2, multi-channel/single-channel selection (display 8888/1111), the factory setting is set to multi-channel/single-channel according to user requirements.
◆Parameter 3, closing manual/automatic selection (display HE--/HEAU), the factory setting is automatic.
◆Parameter 4, manual approval for closing (display HE11/HE00, HE11 requires approval), the factory setting is no approval.
◆Parameter 5, allow/disallow closing without pressure (display HU11/HU00, HU11 is allowed), the factory setting is not allowed.
◆Parameter 6, the baud rate setting (displayed as 1200, 2400, 4800, 9600) is factory set to 2400.
◆Parameter 7, generator frequency modulation (speed) manual/automatic selection (display TF--/TFAU), manual is not allowed to work, the factory setting is automatic.
◆Parameter 8, generator voltage regulation manual/automatic selection (TU--/TUAU is displayed), manual is not allowed to work, the factory setting is automatic.
◆Parameter 9, generator voltage regulation mode selection: digital/analog regulation (display dddd/AAAA). The corresponding adjustment parameter of digital adjustment is parameter 23; the analog adjustment is pulse width adjustment, and the corresponding adjustment parameter is parameter 24. The factory setting is analog adjustment.
◆Parameter 10, when digital voltage regulation mode is selected, count/(special) pulse width regulation selection (display CCCC/PPPP). Count adjustment uses parameter 23 as the basic adjustment count; pulse width adjustment uses parameter 23 as the basic adjustment strength index, and uses parameters 24 and 25 to simulate the continuous plus (continuously minus) button action pulse width in line with the adjustment strength. This parameter does not appear when analog adjustment is selected, and the factory setting count adjustment.
◆Parameter 11, 1# channel working mode selection: line/generator (display EEEE/FFFF), usually when the user enters the parameter setting state, first enter this working mode selection. The factory setting is generator mode. Although in principle, 1# channel can be set to any working mode, but in the case of multiple channels, we stipulate: if at least one of the channels is a generator, the 1# channel must be selected as the generator working mode (the rest are optional); In the case of all lines, if at least one of them is a line difference frequency grid connection, the 1# channel must be selected as the difference frequency grid connection mode.
◆Parameter 12, 1# channel grid (system side) voltage sampling corner/no corner selection (display PH11/PH00), the factory setting is no corner.
◆ Parameter 13, 1# channel grid (system side) voltage sampling when selecting the corner, the corner +30°/-30° (display 30°/-30°), The factory setting is -30°.
◆Parameter 14, when channel 1 selects the line working mode, the difference frequency/same frequency grid connection is selected, dF11/dF00 is displayed, and the factory setting is the same frequency. This parameter does not appear when the 1# channel is selected as the generator working mode.
◆ Parameter 15, 1# channel lead time setting, the setting range is 0.05S～0.8S, and the setting precision is 0.01S. The lead time is used to compensate a series of time delays from the closing command of the quasi-synchronized device to the actual closing, and the factory setting is 0.3S. If the "Synchronous feedback" signal is connected, the device will automatically modify this parameter after the synchronous closing is successful.
◆Parameter 16, the rated voltage setting of the 1# channel generator (to be paralleled), the setting range is 50V~125V, and the setting accuracy is 0.5V. The general standard PT voltage is 100V. Due to the possible manufacturing error of the sampling voltage transformer, as well as the "line voltage"/"phase voltage", △/Y connection method, etc., the sampling voltage corresponding to the rated voltage is not 100V, how much is set? . The factory setting is 100V.
◆ Parameter 17, 1# channel grid (system side) rated voltage setting, the setting range is 50V ~ 125V, the setting accuracy is 0.5V, similar to parameter 16. The factory setting is 100V.
◆ Parameter 18, generator allowable frequency difference setting, the setting range is ±0.05Hz～±0.6Hz, and the setting accuracy is 0.01Hz. The factory setting is 0.2Hz. But when the 1# channel is set to the line difference frequency grid connection work mode, this parameter should be set to "line frequency difference", the setting range is ±0.02Hz～±0.3Hz, and the setting accuracy is 0.01Hz.
◆Parameter 19, generator allowable voltage difference setting, the setting range is 1%～8% of rated voltage. Set the accuracy to 0.1%. The system will adjust the positive deviation according to this set value (the positive deviation is 1.5 times the set value, and the negative deviation is 0.5 times the set value), and the factory setting is 3%. However, when the 1# channel is set to the line working mode, this parameter should be set as "line pressure difference", the setting range is ±1%～±18%, and the setting accuracy is 0.1%.
parameter 20, generator (line difference frequency grid-connected) allowable closing phase difference setting, the setting range is ±1.0°～±6.0°, and the setting accuracy is 0.1 °. The factory setting is 3.0°. However, when the 1# channel is set to the working mode of line co-frequency and grid connection, this parameter should be set to "power angle", the setting range is 10°～60°, and the setting accuracy is 1°. Parameters 18, 19, and 20 are generally used for generator parameter settings, and parameters 42, 43, and 44 are generally used for similar circuit parameter settings. However, the settings of parameters 18, 19 and 20 are always consistent with the working mode selection of 1# channel, when all 8 channels are connected to the grid at the same frequency When 1# channel takes parameters18, 19, 20, other channels take parameters 42, 43, 44. Therefore, this arrangement is made to only take the first 27 parameters when working with a single channel.
Parameter 21, generator frequency modulation pulse width setting, the setting range is 0.1S～0.8S, the basic adjustment interval is 1S, the setting accuracy is 0.01S, variable coefficient adjustment . The factory setting is 0.3S.
◆Parameter 22, closing width setting, the setting range is 0.2S～1S, the setting precision is 0.01S, and the factory setting is 0.5S.
parameter 23, the generator digital voltage regulation coefficient setting, the setting range is 2~10, the setting precision is 1, it is valid when the parameter 9 is set to digital voltage regulation, it leaves the factory Set to 6.
◆ Parameter 24, generator analog voltage regulation pulse width (digital single-shot voltage regulation pulse width) setting, the setting range is 0.1S～0.8S, and the setting accuracy is 0.01 S, when parameter 9 is set to analog voltage regulation, its meaning is the analog voltage regulation pulse width, and the factory setting is 0.3S. When parameter 9 is set to digital voltage regulation and parameter 10 is set to pulse width voltage regulation, its meaning is digital single-shot voltage regulation pulse width. Equivalent to the digital potentiometer ±1 digit when the button is pressed the maximum time our company's digital potentiometer is designed to be 0.3S
Number 25, the incremental pulse width setting of the generator digital voltage regulation, the setting range is 0.02S～0.2S, the setting accuracy is 0.01S, and the factory setting is 0.06 S, the value of our company's digital potentiometer is designed to be 0.06S. It is valid when parameter 9 is set to digital voltage regulation and parameter 10 is set to pulse width voltage regulation, and this parameter does not appear in other settings. It cooperates with parameter 24 "digital single-shot voltage regulation pulse width" to complete the preparation of "digital special pulse width". Assuming that "digital single-shot voltage regulation pulse width" is set to TA, this parameter is set to TB, if parameter 23 Digital voltage regulation coefficient K=1, then "digital special pulse width" T=TA-0.01; K=2, T= TA-0.01+TB; K=3, T=TA-0.01+2TB …
Parameter 26, generator (to be paralleled) overvoltage value setting, it means the ratio of overvoltage value to rated voltage, the setting range is 110%～130 %. The factory setting is 120%.
◆Parameter 27, equipment number setting, the setting range is 0～99, the factory setting is 10.
◆Parameter 28, 2# channel working mode selection: line/generator (display EEEE/FFFF), the factory setting is generator mode.
◆Parameter 29, 2# channel grid (system side) voltage sampling corner/no corner selection (display PH11/PH00), the factory setting is no corner.
◆ Parameter 30, when the voltage sampling of the 2# channel grid (system side) selects the corner, the corner is +30°/-30° (display 30°/-30°), The factory setting is -30°.
◆When parameter 31, 2# channel selects the line working mode, the difference frequency/same frequency grid connection selection, displays dF11/dF00, the factory setting 8 is the same frequency. This parameter does not appear when the 2# channel is selected as the generator working mode.
◆Parameter 32, 2# channel lead time setting, the setting range is 0.05S～0.8S, and the setting precision is 0.01S. The factory setting is 0.3S. If the "Synchronous feedback" signal is connected, the device will automaticallyModify this parameter manually.
◆ Parameter 33, 2# channel generator (to be paralleled) rated voltage setting, the setting range is 50V~125V, and the setting accuracy is 0.5V. The factory setting is 100V.
◆Parameter 34, 2# channel grid (system side) rated voltage setting, the setting range is 50V~125V, and the setting accuracy is 0.5V. The factory setting is 100V.
◆ Parameter 35, 3# channel working mode selection: line/generator (display EEEE/FFFF), the factory setting is line mode.
◆ Parameter 36, 3# channel grid (system side) voltage sampling corner/no corner selection (display PH11/PH00), the factory setting is no corner.
◆ parameter 37, when the voltage sampling of the 3# channel grid (system side) selects the corner, the corner is +30°/-30° (display 30°/-30°), The factory setting is -30°.
◆ When parameter 38, 3# channel selects the line working mode, the difference frequency/same frequency grid connection is selected, and dF11/dF00 is displayed, and the factory setting is the same frequency. This parameter does not appear when the 3# channel is selected as the generator working mode.
◆Parameter 39, 3# channel lead time setting, the setting range is 0.05S～0.8S, and the setting precision is 0.01S. The factory setting is 0.3S. If the "Synchronous feedback" signal is connected, the device will automatically modify this parameter after the synchronous closing is successful.
◆Parameter 40, 3# channel generator (to be paralleled) rated voltage setting, set The range is 50V～125V, . The setting precision is 0.5V. The factory setting is 100V.
◆Parameter 41, 3# channel grid (system side) rated voltage setting, the setting range is 50V~125V, and the setting accuracy is 0.5V. The factory setting is 100V.
◆Parameter 42, the allowable frequency difference setting of line difference frequency grid connection, the setting range is ±0.02Hz～±0.3Hz, and the setting accuracy is 0.01Hz. The factory setting is 0.1Hz.
◆ Parameter 43, the setting of the allowable voltage difference of the line grid connection, the setting range is ±1%～±18% of the rated voltage, and the setting accuracy is 0.1%. The factory setting is ±5%
parameter 44, the "power angle" setting of line co-frequency grid connection, the setting range is 10°～60°, the setting accuracy is 1°, and the factory setting is 30 °. This parameter can be temporarily modified by the host computer on site until 80°. But (after a power outage) it doesn't save.
◆Parameter 45, 4# channel working mode selection: line/generator (display EEEE/FFFF), the factory setting is line mode.
◆Parameter 46, 4# channel grid (system side) voltage sampling corner/no corner selection (display PH11/PH00), the factory setting is no corner.
◆ parameter 47, when the voltage sampling of channel 4# channel grid (system side) selects the corner, the corner is +30°/-30° (display 30°/-30°), The factory setting is -30°. 9
◆ When parameter 48, 4# channel selects the line working mode, the difference frequency/same frequency grid connection is selected, dF11/dF00 is displayed, and the factory setting is the same frequency. This parameter does not appear when the 4# channel is selected as the generator working mode.
◆Parameter 49, 4# channel lead time setting, the setting range is 0.05S～0.8S, and the setting precision is 0.01S. The factory setting is 0.3S. If the "Synchronous feedback" signal is connected, the device will automatically modify this parameter after the synchronous closing is successful.
◆Parameter 50, 4# channel generator (to be paralleled) rated voltage setting, the setting range is 50V~125V, and the setting accuracy is 0.5V. The factory setting is 100V.
◆Parameter 51, 4# channel grid (system side) rated voltage setting, the setting range is 50V~125V, and the setting accuracy is 0.5V. The factory setting is 100V.
◆Parameter 52, 5# channel working mode selection, similar to parameter 45.
◆Parameter 53, 5# channel grid (system side) voltage sampling corner/no corner selection, similar to parameter 46.
◆Parameter 54, when the voltage sampling of channel 5# channel grid (system side) selects the corner, the corner is +30°/-30°, similar to parameter 47.
◆When parameter 55, 5# channel selects the line working mode, the difference frequency/same frequency grid connection selection, the factory setting is the same frequency. Similar to parameter 48.
◆Parameter 56, 5# channel lead time setting, similar to parameter 49.
◆Parameter 57, 5# channel generator (to be paralleled) rated voltage setting, similar to parameter 50.
◆Parameter 58, 5# channel grid (system side) rated voltage setting, similar to parameter 51.
◆Parameter 59, 6# channel working mode selection, similar to parameter 45.
◆Parameter 60, 6# channel grid (system side) voltage sampling corner/no corner selection, similar to parameter 46.
◆Parameter 61, when the voltage sampling of channel 6# channel grid (system side) selects the corner, the corner is +30°/-30°, similar to parameter 47.
◆When parameter 62, 6# channel selects the line working mode, the difference frequency/same frequency grid connection selection, the factory setting is the same frequency. Similar to parameter 48.
◆Parameter 63, 6# channel lead time setting, similar to parameter 49.
◆Parameter 64, 6# channel generator (to be paralleled) rated voltage setting, similar to parameter 50.
◆Parameter 65, 6# channel grid (system side) rated voltage setting, similar to parameter 51.
◆Parameter 66, 7# channel working mode selection, similar to parameter 45.
◆Parameter 67, 7# channel grid (system side) voltage sampling corner/no corner selection, similar to parameter 46.
◆Parameter 68, 7# channel grid (system side) voltage sampling when selecting the corner, the corner is +30°/-30°, similar to parameter 47.
◆When parameter 69, 7# channel selects the line working mode, the difference frequency/same frequency grid connection selection, the factory setting is the same frequency. Similar to parameter 48.
◆Parameter 70, 7# channel lead time setting, similar to parameter 49.
◆Parameter 71, 7# channel generator (to be paralleled) rated voltage setting, similar to parameter 50.
◆Parameter 72, 7# channel grid (system side) rated voltage setting, similar to parameter 51.
◆Parameter 73, 8# channel working mode selection, similar to parameter 45.
75. Parameter 74, 8# channel grid (system side) voltage sampling corner/no corner selection, similar to parameter 46. 10
◆Parameter 75, 8# channel grid (system side) voltage sampling selects the corner when the corner is +30°/-30°, similar to parameter 47.
◆When parameter 76, 8# channel selects the line working mode, the difference frequency/same frequency grid connection selection, the factory setting is the same frequency. Similar to parameter 48.
◆Parameter 77, 8# channel lead time setting, similar to parameter 49.
◆Parameter 78, 8# channel generator (to be paralleled) rated voltage setting, similar to parameter 50.
◆Parameter 79, 8# channel grid (system side) rated voltage setting, similar to parameter 51.

Device Specifications
◆Power:
AC85V～250V DC100V～250V
◆Input PT signal:
Generator (to be paralleled) standard voltage: 0V～100V+30V
Grid (system side) standard voltage: 0V～100V+30V
◆Input synchronous feedback signal: closing auxiliary normally open contact signal
◆Output signal: speed-up, speed-down, boost, step-down synchronous closing and fault six contact signals, output in relay mode,
The contact capacity is AC resistive 220V/5A; AC resistive 380V/2A; DC 110V/0.8A, DC 220V/0.2A.
◆For other conditions, please refer to the industry standard of the former Ministry of Machinery Industry JB/T 3950-1999 "Automatic quasi-synchronization device".


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