Intelligent integrated hybrid dynamic reactive compensation control system

Abstract

The invention relates to the technical field of power system reactive compensation, and discloses an intelligent integrated hybrid dynamic reactive compensation control system which comprises an execution unit and an intelligent control unit. The execution unit comprises a static synchronous compensator unit and a thyristor switched capacitor unit; the intelligent control unit comprises a system state monitoring module, an impedance parameter feed-forward mapping table storage module and an active transient pre-suppression coordinator. A three-stage handover control process is executed through an active transient pre-suppression coordinator, a static synchronous compensator unit is controlled to output compensation power in advance before a thyristor switching capacitor unit acts, and reactive power impact at the switching moment is actively stabilized; meanwhile, according to the new system impedance state after switching, the optimal control parameter set is retrieved and loaded from the mapping table, and the problem of mismatching of the control parameters is solved. According to the invention, high-efficiency cooperation of high-capacity step compensation and rapid continuous adjustment is realized, and the voltage stability of the power grid is improved.

Description

Technical Field

[0001] This invention relates to the field of reactive power compensation technology in power systems, and in particular to an intelligent integrated hybrid dynamic reactive power compensation control system. Background Technology

[0002] Power grid systems require reactive power compensation to maintain voltage stability. Dynamic reactive power compensation devices, especially hybrid dynamic reactive power compensation systems composed of static synchronous compensators and thyristor-switched capacitors, are a common technical solution.

[0003] The hybrid system utilizes thyristor-switched capacitors to provide large-capacity step compensation and a static synchronous compensator (SRC) to provide smooth and fine-tuning. This combination aims to reduce the overall cost of the compensation system. However, in actual operation, the coordinated control of the two units presents difficulties. The lack of effective management of the operating range of the SRC unit leads to untimely switching decisions by the thyristor-switched capacitor unit, resulting in low overall operating efficiency of the hybrid compensation system.

[0004] The compensation capacity of the thyristor-switched capacitor unit is applied to the grid in a step-like manner. This step-like action generates a momentary reactive power surge at the point of common coupling (PCC). This surge causes voltage fluctuations at PCC, affecting power quality. Although the static synchronous compensator (SMC) unit has a fast response capability, under traditional control methods, it can only passively compensate after the fluctuation occurs and cannot actively suppress this transient process.

[0005] The switching on or off of the thyristor-controlled capacitor bank also alters the system impedance at the compensation system's connection point. The controller of the static synchronous compensator unit operates using fixed control parameters. When the system impedance changes, these fixed control parameters cannot adapt to the new impedance state, resulting in control parameter mismatch. This mismatch reduces the dynamic response performance of the control system and may even trigger system oscillations, threatening system stability. Summary of the Invention

[0006] The purpose of this invention is to provide an intelligent integrated hybrid dynamic reactive power compensation control system, which solves the problems of reactive power impact caused by the switching of thyristor capacitor units, leading to voltage fluctuations, system impedance changes causing control parameter mismatch of static synchronous compensator units, and poor overall operating efficiency due to poor coordinated control of the hybrid compensation system.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an intelligent integrated hybrid dynamic reactive power compensation control system, comprising an execution unit and an intelligent control unit.

[0008] The execution unit is connected in parallel to the point of common coupling of the power grid to compensate for the reactive power of the load. The execution unit includes: a static synchronous compensator (SRC) unit for providing continuously adjustable reactive power; and a thyristor-switched capacitor (TSC) unit. The TSC unit comprises several groups of TSCs connected in parallel, all of which are connected in parallel to the point of common coupling.

[0009] In one specific implementation, the static synchronous compensator unit is a voltage source inverter and is connected to the common connection point via a coupling transformer. Each TSC group of the thyristor-switched capacitor unit contains a thyristor valve and a capacitor connected in series.

[0010] The system may also include a group of sensors for monitoring, such as a voltage sensor located at the common connection point, a first current sensor located on the load side, a second current sensor for measuring the output current of the static synchronous compensator unit, and several third current sensors for measuring several groups of currents of the TSC group.

[0011] The intelligent control unit establishes a signal connection with the execution unit, and the signal input terminal of the intelligent control unit can be connected to the signal output terminal of the sensor group to receive real-time voltage and current sampling values.

[0012] The intelligent control unit includes:

[0013] The system status monitoring module is used to calculate the current impedance combination state of the system;

[0014] Impedance parameter feedforward mapping table storage module is used to store the mapping relationship data between the system impedance combination state and the optimal control parameters of the static synchronous compensator unit;

[0015] Static synchronous compensator unit controller;

[0016] Thyristor-controlled capacitor switching unit controller;

[0017] And an active transient pre-suppression coordinator.

[0018] The system status monitoring module receives voltage and current sampling data from the common connection point and calculates the grid-side reactive power, load reactive power, and the current impedance combination state of the system based on the sampling data.

[0019] The impedance parameter feedforward mapping table storage module stores mapping relationship data including indices of various system impedance combination states and corresponding optimal control parameter sets of the static synchronous compensator unit. The optimal control parameter set may include proportional gain parameters and integral gain parameters.

[0020] The static synchronizing compensator unit controller is used to control the reactive power output of the static synchronizing compensator unit. The static synchronizing compensator unit controller is configured to steady-state fine-tuning mode and transient handover mode.

[0021] The thyristor switching capacitor unit controller is used to control the switching of the thyristor switching capacitor unit.

[0022] The active transient pre-suppression coordinator is connected to the system state monitoring module, the impedance parameter feedforward mapping table storage module, the static synchronous compensator unit controller, and the thyristor switching capacitor unit controller, respectively. The active transient pre-suppression coordinator is used to trigger the switching decisions of the thyristor switching capacitor unit based on the system operating state and execute a three-stage handover control process to achieve coordinated control between the static synchronous compensator unit and the thyristor switching capacitor unit.

[0023] In one embodiment, the active transient pre-suppression coordinator continuously monitors the reactive power of the static synchronizing compensator (SRC) unit and pre-sets an upper threshold for activating the thyristor-switched capacitor unit and a lower threshold for deactivating the thyristor-switched capacitor unit. When the reactive power of the SRC unit exceeds the upper threshold for activation and remains below it for a preset delay time, an activation decision for the thyristor-switched capacitor unit is triggered; when the reactive power of the SRC unit falls below the lower threshold for deactivation and remains below it for a preset delay time, a deactivation decision for the thyristor-switched capacitor unit is triggered.

[0024] As the core technical solution of this invention, the three-stage handover control process includes:

[0025] Transient preloading phase: The active transient pre-suppression coordinator instructs the static synchronous compensator unit controller to switch to transient handover mode. In this mode, the transient handover control unit is activated and executes open-loop reactive power ramp control. The transient handover control unit receives the transient preloading target value and ramp transition time from the active transient pre-suppression coordinator, obtains the reactive power of the static synchronous compensator unit at this moment, and generates a reactive power ramp command to control the reactive power of the static synchronous compensator unit to change linearly from the current value to the transient preloading target value.

[0026] Synchronous switching phase: At the end of the transient preloading phase, the active transient pre-suppression coordinator instructs the thyristor switching capacitor unit controller to switch on or off the corresponding TSC group. In one specific implementation, the thyristor switching capacitor unit controller includes a voltage zero-crossing detection unit, which sends a trigger pulse signal to execute the switching when a voltage zero-crossing point is detected.

[0027] Simultaneously with the switching, the active transient pre-suppression coordinator retrieves the optimal control parameter set corresponding to the new system impedance combination state from the impedance parameter feedforward mapping table storage module based on the new system impedance combination state determined by the system state monitoring module, and instructs the static synchronous compensator unit controller to switch back to steady-state fine-tuning mode and load the optimal control parameter set.

[0028] New Steady-State Recovery Phase: The Static Synchronous Compensator (SSC) unit controller uses the new optimal control parameter set to perform closed-loop reactive power control, enabling the compensation system to smoothly transition to the new operating point. In steady-state fine-tuning mode, the steady-state fine-tuning control unit is activated. It receives the load reactive power as the total reactive power compensation target of the system and receives the total reactive power provided by the compensation system as feedback. It calculates the reactive power error and generates the reactive current command for the SSC unit based on the reactive power error and the newly loaded control parameters.

[0029] In summary, the present invention has at least one of the following beneficial technical effects:

[0030] 1. This invention sets up a three-stage handover control process and utilizes the transient preloading stage to control the static synchronous compensator unit to change its reactive power output in advance before the switching action of the thyristor switching capacitor unit occurs, thereby actively absorbing the reactive power step generated at the moment of switching and smoothing the voltage fluctuation at the point of common coupling.

[0031] 2. By setting up an impedance parameter feedforward mapping table storage module, after the thyristor switching capacitor unit completes its switching action, the present invention dynamically loads the corresponding optimal control parameter set for the static synchronous compensator unit controller based on the new system impedance combination state determined by the system state monitoring module. This solves the problem of control parameter mismatch caused by system impedance changes and improves the stability of the system under different operating conditions.

[0032] 3. This invention monitors the reactive power output of the static synchronous compensator unit through an active transient pre-suppression coordinator, triggers the switching decision of the thyristor switching capacitor unit according to a preset threshold, and maintains the operating range of the static synchronous compensator unit within a reasonable range. This achieves coordinated control of large-capacity reactive power compensation and smooth and fine adjustment, and improves the overall operating efficiency of the hybrid compensation system. Attached Figure Description

[0033] Figure 1 This is a topology diagram of the intelligent integrated hybrid dynamic reactive power compensation control system of the present invention.

[0034] Figure 2 This is a functional block diagram of the intelligent control unit of the present invention;

[0035] Figure 3This is a structural diagram of the internal logic function modules of the intelligent control unit of the present invention.

[0036] Among them, 1. Intelligent integrated hybrid dynamic reactive power compensation control system; 10. Static synchronous compensator unit; 100. Power grid; 101. Point of common coupling; 20. Thyristor switching capacitor unit; 30. Intelligent control unit; 301. System status monitoring module; 302. Impedance parameter feedforward mapping table storage module; 303. Active transient pre-suppression coordinator; 304. STATCOM controller; 3041. Steady-state fine-tuning control unit; 3042. Transient handover control unit; 305. TSC controller; 31. Signal acquisition interface; 32. STATCOM control interface; 33. TSC control interface; 40. Sensor; 41. Voltage sensor; 42. First current sensor; 43. Second current sensor. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 The present invention will be further described in detail below.

[0038] This invention provides an intelligent integrated hybrid dynamic reactive power compensation control system.

[0039] See attached document Figure 1 , attached Figure 1 This is a topology diagram of an intelligent integrated hybrid dynamic reactive power compensation control system 1 according to an embodiment of the present invention. The present invention provides an intelligent integrated hybrid dynamic reactive power compensation control system 1, which is connected in parallel to the common connection point 101 of the power grid 100 for compensating the reactive power of the load.

[0040] The intelligent integrated hybrid dynamic reactive power compensation control system 1 includes an execution unit and an intelligent control unit 30. The execution unit is connected in parallel to a common connection point 101, and the intelligent control unit 30 establishes a signal connection with the execution unit.

[0041] The execution unit includes a static synchronous compensator unit 10 and several sets of thyristor switching capacitor units 20.

[0042] The Static Synchronous Compensator (SSC) unit 10 is a voltage source inverter, connected to a common coupling point 101 via a coupling transformer 11. The SSC unit 10 is used to provide continuously adjustable reactive power.

[0043] Thyristor-switched capacitor unit 20 includes A group of TSCs connected in parallel is labeled as ( Each TSC group Includes a thyristor valve and a capacitor Series connection. Thyristor valve It consists of two thyristors connected in reverse parallel. All TSC groups are connected in parallel to the common connection point 101.

[0044] The intelligent integrated hybrid dynamic reactive power compensation control system 1 also includes a set of sensors 40 for monitoring. A voltage sensor 41 is located at the common coupling point 101 to measure the voltage at the common coupling point 101. A first current sensor 42 is disposed on the load side for measuring the load current. And based on this, calculate the reactive power consumed by the load. .

[0045] A second current sensor 43 is used to measure the output current of the static synchro unit 10. Based on this, the reactive power provided by the static synchronizing compensator unit 10 is calculated. .

[0046] A third current sensor Used for measurement Group TSC current Based on this, calculate the TSC groups for each group. The reactive power provided.

[0047] The signal input terminal of the intelligent control unit 30 is connected to the voltage sensor 41, the first current sensor 42, the second current sensor 43, and... A third current sensor The signal output terminal is connected to receive real-time voltage and current sample values.

[0048] The PWM control signal output terminal of the intelligent control unit 30 is connected to the control interface of the static synchronous compensator unit 10 to control the reactive power output of the static synchronous compensator unit 10.

[0049] Intelligent control unit 30 Group trigger pulse signal The output terminals are respectively connected to Group TSC thyristor valve The trigger interface is used to control the first The input and resection of the TSC group.

[0050] At point of common coupling 101, the reactive power provided by power grid 100 Reactive power consumed by the load The total reactive power provided by the intelligent integrated hybrid dynamic reactive power compensation control system 1 It satisfies the reactive power balance relationship.

[0051] ;

[0052] in: The reactive power supplied by power grid 100 to point of common coupling 101; Total reactive power consumed by the load; The total reactive power provided by the intelligent integrated hybrid dynamic reactive power compensation control system 1.

[0053] The intelligent integrated hybrid dynamic reactive power compensation control system 1 provides a total reactive power of Reactive power provided by static synchronous compensator unit 10 The total reactive power provided by the thyristor-switched capacitor unit 20 Together they constitute.

[0054] ;

[0055] in: The total reactive power provided by the intelligent integrated hybrid dynamic reactive power compensation control system 1; The reactive power provided by the static synchronous compensator unit 10; The total reactive power provided by the thyristor-switched capacitor unit 20.

[0056] The total reactive power provided by the thyristor-switched capacitor unit 20 yes Group TSC The sum of reactive power when in operation.

[0057] ;

[0058] in: The total reactive power provided by the thyristor-switched capacitor unit 20; : Total number of groups in the TSC group; : Index number of the TSC group; : No. Switching status of TSC group Indicates investment, Indicates excision; : No. The reactive power capacity of the TSC group under rated voltage.

[0059] See attached document Figure 2 , attached Figure 2This is a functional block diagram of an intelligent control unit 30 in one embodiment of the present invention, which shows the physical connection interface of the intelligent control unit 30.

[0060] The intelligent control unit 30 includes a signal acquisition interface 31. The input terminals of the signal acquisition interface 31 are respectively connected to a voltage sensor 41, a first current sensor 42, a second current sensor 43, and... A third current sensor Connect the signal output terminal.

[0061] The signal acquisition interface 31 contains an analog-to-digital conversion channel, which converts the analog voltage signal acquired by the voltage sensor 41 into a digital signal. And current sensor 42, second current sensor 43, third current sensor Collected analog current signal , , It is converted into a digital signal for internal processing by the intelligent control unit 30.

[0062] The intelligent control unit 30 includes a STATCOM control interface 32. The signal output terminal of the STATCOM control interface 32 is connected to the control interface of the static synchronizing compensator unit 10. The STATCOM control interface 32 is used to send PWM control signals to the static synchronizing compensator unit 10.

[0063] The intelligent control unit 30 includes a TSC control interface 33. The TSC control interface 33 includes... Each has an independent trigger pulse output channel. Each trigger pulse output channel is connected to... Group TSC Zhongjing gate valve The trigger interface. The TSC control interface 33 is used to send trigger pulse signals. To the corresponding thyristor valve .

[0064] STATCOM control interface 32 is connected to static synchrotron unit 10 via the first set of fiber optic links. TSC control interface 33... Each trigger pulse output channel passes through Group 2 fiber optic link and Thyristor valve The connection enables electrical isolation between the control signals and the main circuit.

[0065] See attached document Figure 3 , attached Figure 3This is a structural diagram of the internal logic function modules of an intelligent control unit 30 according to an embodiment of the present invention. The present invention provides an intelligent integrated hybrid dynamic reactive power compensation control system, wherein the intelligent control unit 30 is internally configured with a system status monitoring module 301, an impedance parameter feedforward mapping table storage module 302, an active transient pre-suppression coordinator 303, a STATCOM controller 304, and a TSC controller 305.

[0066] The system status monitoring module 301 is connected to the signal acquisition interface 31 and is used to receive voltage sampling data from the common connection point 101. The system status monitoring module 301 calculates the grid-side reactive power, load reactive power, and the current impedance combination state of the system status monitoring module 301 based on the sampled data, including current sampling data. Depend on Switching state vector of thyristor switching capacitor unit 20 The only certainty.

[0067] ;

[0068] in: : No. The switching state vector corresponding to the impedance state of the system; : The first in the vector The element corresponding to the element Group TSC The cutting state is 0 or 1, where 1 indicates cutting and 0 indicates cutting. : Total number of TSC groups.

[0069] The impedance parameter feedforward mapping table storage module 302 is used to store the mapping relationship data between the system impedance state and the STATCOM optimal control parameters. The mapping relationship data includes... Group state index and corresponding control parameter set. For any system impedance state The impedance parameter feedforward mapping table storage module 302 stores a set of corresponding optimal control parameters. .

[0070] ;

[0071] in: : Corresponding system impedance state The optimal control parameter set for STATCOM; : Corresponding system impedance state The proportional gain parameter is below; : Corresponding system impedance state The integral gain parameter is as follows.

[0072] The active transient pre-suppression coordinator 303 is connected to the system status monitoring module 301, the impedance parameter feedforward mapping table storage module 302, the STATCOM controller 304, and the TSC controller 305, respectively. The active transient pre-suppression coordinator 303 receives reactive power demand data output from the system status monitoring module 301 and determines whether the TSC switching conditions are met. When the switching conditions are met, the active transient pre-suppression coordinator 303 retrieves the control parameter set corresponding to the target state from the impedance parameter feedforward mapping table storage module 302, and sends a mode switching command and a parameter loading command to the STATCOM controller 304, while simultaneously sending an action command to the TSC controller 305.

[0073] The STATCOM controller 304 is connected to the STATCOM control interface 32 and is used to generate PWM signals to drive the static synchronous compensator unit 10. The STATCOM controller 304 internally includes a steady-state fine-tuning control unit 3041 and a transient handover control unit 3042. The steady-state fine-tuning control unit 3041 performs closed-loop reactive power control in steady-state mode, and its control parameters are dynamically loaded by the active transient pre-suppression coordinator 303. The transient handover control unit 3042 performs open-loop power ramp control in transient mode, and its ramp target value is set by the active transient pre-suppression coordinator 303.

[0074] The TSC controller 305 is connected to the TSC control interface 33 and is used to generate trigger pulse signals to drive the thyristor switching capacitor unit 20. The TSC controller 305 internally includes a voltage zero-crossing detection unit for monitoring the thyristor valve. The voltage at both ends crosses zero. When the active transient pre-suppression coordinator 303 is received, the TSC controller 305 sends a trigger pulse signal at the moment the voltage crosses zero. .

[0075] This invention provides a control method for an intelligent integrated hybrid dynamic reactive power compensation control system, wherein the method performs the construction of a mapping table during the offline preparation stage.

[0076] The construction of the mapping table first requires defining all the working states of the system. The system includes... Thyristor-switched capacitor unit 20 ( ).

[0077] Group TSC The input and resection actions formed There are several different combinations. Each combination is defined as a system impedance state. ,in For state index, The value range is from 1 to .

[0078] Each system impedance state By a unique dimensional projection state vector describe.

[0079] ;

[0080] in: : No. The switching state vector corresponding to the impedance state of the system; : The first in the vector The element corresponding to the element Group TSC The cutting state is 0 or 1, where 1 indicates cutting and 0 indicates cutting. : Total number of TSC groups.

[0081] System impedance state The physical meaning is that when the combination state of the TSC group is At that time, the equivalent system impedance at the common connection point 101 where the control loop of the static synchronous compensator unit 10 is located is... It is uniquely determined. The equivalent impedance of the power grid. This determines the stability of the control loop of the static synchronous compensator unit 10.

[0082] Define system impedance state The purpose is to provide an index for the impedance parameter feedforward mapping table storage module 302. All data entries stored in the impedance parameter feedforward mapping table storage module 302 use the system impedance state. As a key-value index.

[0083] This invention provides a control method for an intelligent integrated hybrid dynamic reactive power compensation control system, wherein the method performs the construction of a mapping table during the offline preparation stage.

[0084] Defining the system impedance state After that, it is necessary to do for each Determine a set of corresponding optimal control parameters The control stability of the static synchronous compensator unit 10 and the equivalent system impedance at the point of common coupling 101. Closely related. Different Corresponding to different Fixed control parameters cannot achieve stable control effects in all states.

[0085] The offline tuning process for control parameters is as follows: For System impedance state Each state in:

[0086] Step 1: Establish the corresponding state The system simulation model has an equivalent system impedance. .

[0087] Step Two: In the simulation model, a control parameter optimization algorithm is used to tune the control parameters of the steady-state fine-tuning control unit 3041 in the STATCOM controller 304. The control parameter optimization algorithm utilizes a fuzzy neural network algorithm to obtain the control parameters of the steady-state fine-tuning control unit 3041 in the current simulation model through iterative optimization. The set of control parameters that enables the STATCOM controller 304 to respond fastest and with the least oscillation.

[0088] Step 3: Calculate the optimal control parameter set output by the optimization algorithm. Extraction of the optimal control parameter set. Includes proportional gain parameter and integral gain parameter .

[0089] ;

[0090] in: : Corresponding system impedance state The optimal control parameter set for STATCOM; : Corresponding system impedance state The proportional gain parameter is below; : Corresponding system impedance state The integral gain parameter is as follows.

[0091] Step 4: Determine the system impedance state and its corresponding optimal control parameter set As a data pair The impedance parameter feedforward mapping table storage module 302 is stored.

[0092] Repeat steps one through four until all are completed. The impedance states of all systems have been calibrated. The final storage in the impedance parameter feedforward mapping table storage module 302 is... Group mapping relationship.

[0093] This invention provides a control method for an intelligent integrated hybrid dynamic reactive power compensation control system. During the online control phase, the method defines and switches the operating mode of the STATCOM controller 304. The STATCOM controller 304 is configured with two operating modes, selected by the active transient pre-suppression coordinator 303 based on the system's operating state.

[0094] The first operating mode is the steady-state fine-tuning mode. When the active transient pre-suppression coordinator 303 does not perform TSC switching coordination, the STATCOM controller 304 operates in the steady-state fine-tuning mode.

[0095] In this mode, the steady-state fine-tuning control unit 3041 inside the STATCOM controller 304 is activated. The steady-state fine-tuning control unit 3041 performs closed-loop reactive power control.

[0096] The active transient pre-suppression coordinator 303 determines the current system impedance state based on the system state monitoring module 301. The corresponding optimal control parameter set is retrieved from the impedance parameter feedforward mapping table storage module 302. And load it into the steady-state fine-tuning control unit 3041.

[0097] Steady-state fine-tuning control unit 3041 receives the reactive power of the load. As the total reactive power compensation command, it receives the total reactive power provided by the intelligent integrated hybrid dynamic reactive power compensation control system 1. As feedback, this feedback mechanism enables the STATCOM to coordinate with the TSC group to compensate for load reactive power in steady state, and to undertake the tasks of fine-tuning and error compensation. The steady-state fine-tuning control unit 3041 calculates the reactive power error. Reactive power error The calculation is as follows:

[0098] ;

[0099] in: : Reactive power error of the system; Total reactive power consumed by the load; The total reactive power provided by the intelligent integrated hybrid dynamic reactive power compensation control system 1.

[0100] Steady-state fine-tuning control unit 3041 based on reactive power error and loading parameters Generate STATCOM reactive current command .

[0101] ;

[0102] in: STATCOM reactive current command; : Corresponding system impedance state The proportional gain parameter is below; : Corresponding system impedance state The integral gain parameter is as follows; : Reactive power error of the system; Time variable; Integration time variable.

[0103] The second operating mode is the transient handover mode. When the active transient pre-suppression coordinator 303 decides to switch the TSC, the active transient pre-suppression coordinator 303 sends a mode switching command to the STATCOM controller 304, causing it to switch to the transient handover mode.

[0104] In this mode, the transient handover control unit 3042 inside the STATCOM controller 304 is activated, and the steady-state fine-tuning control unit 3041 is disabled.

[0105] The transient handover control unit 3042 performs open-loop reactive power ramp control, and the transient handover control unit 3042 stops responding to reactive power error. .

[0106] The transient handover control unit 3042 receives the transient preload target value from the active transient pre-suppression coordinator 303. and slope transition time .

[0107] Transient handover control unit 3042 at mode switching time Start-up, obtain the reactive power of the static synchronous compensator unit 10 at this moment. The transient handover control unit 3042 generates a reactive power ramp command. The instruction comes from Linear change to Reactive power ramp command The calculation is as follows:

[0108] ;

[0109] in: : Reactive power ramp command in transient handover mode; Transient handover mode activation time STATCOM reactive power; Transient preload target value; : Slope transition time; Time variable .

[0110] The inner loop control unit of the STATCOM controller 304 tracks reactive power ramp commands. This reduces the actual output reactive power of the static synchronous compensator unit 10. Follow change.

[0111] See attached document Figure 3 , attached Figure 3This is a structural diagram of the internal logic function modules of an intelligent control unit 30 according to an embodiment of the present invention. The present invention provides a control method for an intelligent integrated hybrid dynamic uncompensated control system, wherein the method performs switching decisions during the online control phase.

[0112] The decision-making logic for switching is executed by the active transient pre-suppression coordinator 303.

[0113] The active transient pre-suppression coordinator 303 continuously monitors the reactive power of the static synchronous compensator unit 10 calculated by the system state monitoring module 301. .

[0114] Preset TSC input threshold and TSC resection threshold . and The steady-state operating range of the static synchronous compensator unit 10 was defined. This is to prevent TSC group... Frequent movements and There is a hysteresis interval between them. .

[0115] When the active transient pre-suppression coordinator 303 detects satisfy And the duration exceeds a preset delay. At that time, the TSC (Total Service Controller) will be triggered to make an investment decision.

[0116] When the active transient pre-suppression coordinator 303 detects satisfy And the duration exceeds a preset delay. At that time, the TSC resection decision is triggered.

[0117] When a TSC deployment decision is triggered, the active transient pre-suppression coordinator 303 determines a set of TSCs that need to be deployed. TSC group The reactive power capacity is .

[0118] The active transient pre-suppression coordinator 303 calculates the transient preloading target value. Transient preload target value Used to hedge TSC group during synchronous switching. The reactive power capacity deployed. For TSC deployment decisions, the transient preload target value. The calculation is as follows:

[0119] ;

[0120] in: Transient preload target value; : TSC group that needs to be invested The reactive power capacity.

[0121] When a TSC resection decision is triggered, the active transient pre-inhibition coordinator 303 determines a group of TSCs that need to be resected. TSC group The reactive power capacity is .

[0122] The active transient pre-suppression coordinator 303 calculates the transient preloading target value. Transient preload target value Used to hedge TSC group during synchronous switching. Reactive power capacity to be cut off. Target value for transient preload for TSC cutoff decision. The calculation is as follows:

[0123] ;

[0124] in: Transient preload target value; TSC group requiring resection The reactive power capacity.

[0125] The active transient pre-suppression coordinator 303 is calculated to obtain Then, a command is sent to the STATCOM controller 304 to switch the STATCOM controller 304 to transient handover mode, and... As the control target for transient handover mode.

[0126] This invention provides a control method for an intelligent integrated hybrid dynamic uncompensated control system. After the active transient pre-suppression coordinator 303 makes a switching decision, the method executes a three-stage handover control process. The following description assumes the activation of a group of TSCs. For example.

[0127] exist At any given time, the active transient pre-suppression coordinator 303 monitors the reactive power of the static synchronous compensator unit 10. Exceeding the upper threshold of investment And start timing.

[0128] exist time, , Still satisfied The Active Transient Pre-Suppression Coordinator 303 officially initiated the three-stage handover control process, determining the TSC group that needs to be deployed. TSC group The reactive power capacity is .

[0129] Phase 1, Transient Preloading Phase, from The moment begins. At time 1, the active transient pre-suppression coordinator 303 calculates the transient preloading target value. The active transient pre-suppression coordinator 303 sends a mode switching command to the STATCOM controller 304, causing the STATCOM controller 304 to switch from steady-state fine-tuning mode to transient handover mode.

[0130] The STATCOM controller 304 activates the transient handover control unit 3042. The transient handover control unit 3042 then... and preset slope transition time Controlling the reactive power of the static synchronous compensator unit 10 from Moment Linear change to .

[0131] Phase two, the synchronous casting and switching phase, occurs during... time. The time is the end of the transient preloading phase.

[0132] ;

[0133] in: Synchronous switching time; The start time of the transient preloading phase; : Slope transition time.

[0134] exist At any given time, the reactive power of the static synchronous compensator unit 10 achieve .

[0135] ;

[0136] in: STATCOM reactive power at the moment of synchronous switching; Transient preload target value; : TSC group that needs to be invested The reactive power capacity.

[0137] exist At any given moment, the active transient pre-suppression coordinator 303 simultaneously executes three operations:

[0138] Operation 1: The active transient pre-suppression coordinator 303 sends an activation command to the TSC controller 305. The TSC controller 305 then... Detecting voltage zero-crossing points at all times and sending trigger pulses. Make TSC group Investment, provision The reactive power.

[0139] Operation 2: The active transient pre-suppression coordinator 303 determines the new system impedance state after switching. And retrieve the new state from the impedance parameter feedforward mapping table storage module 302. The corresponding optimal control parameter set .

[0140] Operation 3: The active transient pre-suppression coordinator 303 sends a mode switching command to the STATCOM controller 304, causing the STATCOM controller 304 to switch from transient handover mode back to steady-state fine-tuning mode. Simultaneously, the optimal control parameter set... Steady-state fine-tuning control unit 3041 is loaded into STATCOM controller 304.

[0141] Phase three, the new steady-state recovery phase, from It will begin after that moment.

[0142] exist At that moment, the TSC group Reactive power input The reactive power preloaded by the static synchronous compensator unit 10 They cancel each other out.

[0143] ;

[0144] The intelligent integrated hybrid dynamic reactive power compensation control system 1 provides a total reactive power of exist Maintaining continuity before and after the event avoids the impact of sudden changes in reactive power on the power grid.

[0145] exist After a certain time, the steady-state fine-tuning control unit 3041 of the STATCOM controller 304 is activated and uses the new optimal control parameter set. (corresponding to the new system impedance state) The closed-loop reactive power control is executed to enable the intelligent integrated hybrid dynamic reactive power compensation control system 1 to smoothly transition to the new operating point.

[0146] The control flow for TSC removal decisions is the opposite of that for TSC deployment decisions, and its transient preload target value... ,in This is the TSC group that needs to be removed. The reactive power capacity.

[0147] See attached document Figure 1 and attached Figure 3 , attached Figure 1 This is a system topology diagram of one embodiment of the present invention, attached. Figure 3 This is a functional block diagram of the intelligent control unit. This invention provides an intelligent integrated hybrid dynamic uncompensated control system 1. The working sequence of the intelligent integrated hybrid dynamic reactive power compensation control system 1 under typical operating conditions is as follows.

[0148] Initially, the intelligent integrated hybrid dynamic reactive power compensation control system 1 operates in the first steady state. The system impedance state is as follows: The STATCOM controller 304 operates in steady-state fine-tuning mode and is equipped with the corresponding... Optimal control parameter set .

[0149] The total reactive power provided by the thyristor-switched capacitor unit 20 is The static synchronous compensator unit 10 outputs reactive power. , Located at the upper threshold of input and the lower threshold of resection between.

[0150] Subsequently, the total reactive power consumed by the load Increase. The STATCOM controller 304 responds in steady-state fine-tuning mode, increasing the reactive power of the static synchronous compensator unit 10. Output to track The changes.

[0151] exist time, The value increases and exceeds the input threshold. The active transient pre-suppression coordinator 303 detected... And start the delay timer. .

[0152] exist time, , Still greater than The active transient pre-suppression coordinator 303 triggers the TSC (Transient Control Controller) activation decision and initiates the three-stage handover control process.

[0153] exist At that moment, the active transient pre-suppression coordinator 303 executes phase one (transient preloading phase). The active transient pre-suppression coordinator 303 determines the TSC group to be engaged as follows: Its reactive power capacity is .

[0154] The active transient pre-suppression coordinator 303 calculates the transient preloading target value. .

[0155] ;

[0156] in: Transient preload target value; : TSC group that needs to be invested The reactive power capacity.

[0157] The active transient pre-suppression coordinator 303 sends a command to switch the STATCOM controller 304 to transient handover mode. arrive During the specified time period, the transient handover control unit 3042 is activated, controlling... from Linear slope change to .

[0158] exist time, achieve Active transient pre-suppression coordinator 303 executes phase two (synchronization switching phase).

[0159] exist At that moment, the active transient pre-suppression coordinator 303 instructs the TSC controller 305 to engage the TSC group at the voltage zero-crossing point. TSC group Provided instantly The reactive power.

[0160] exist At any given time, the reactive power of the static synchronous compensator unit 10 With TSC group Reactive power input They cancel each other out.

[0161] ;

[0162] The intelligent integrated hybrid dynamic reactive power compensation control system 1 provides a total reactive power of exist Maintaining continuity before and after the event avoids sudden changes in reactive power.

[0163] exist At time 1, the active transient pre-suppression coordinator 303 determines the new system impedance state as follows: And retrieve the new optimal control parameter set from the impedance parameter feedforward mapping table storage module 302. .

[0164] The active transient pre-suppression coordinator 303 instructs the STATCOM controller 304 to switch back to steady-state fine-tuning mode and load... .

[0165] exist After that point, the system enters Phase Three (New Steady-State Recovery Phase). The steady-state fine-tuning control unit 3041 of the STATCOM controller 304 is activated and uses the new optimal set of control parameters. Perform closed-loop control.

[0166] The value from Smooth adjustment to a new steady-state operating point , lie in and Between. System 1 enters the second steady state.

[0167] The present invention provides an intelligent integrated hybrid dynamic reactive power compensation control system 1. The system 1 achieves precise regulation of the reactive power of the power grid 100 through the coordinated operation of the static synchronous compensator unit 10 and the thyristor switching capacitor unit 20, while suppressing the transient effects caused by the switching action.

[0168] The synergistic effect of the intelligent integrated hybrid dynamic reactive power compensation control system 1 is reflected in the following aspects:

[0169] First, through the three-stage handover control process executed by the active transient pre-suppression coordinator 303, the system realizes the TSC group Smooth transition of reactive power during switching. In TSC group Before switching, the static synchronous compensator unit 10 pre-adjusts its output reactive power to the transient preload target value through the transient handover control unit 3042. At the synchronous switching time TSC group Reactive power that is added or removed or The reactive power output of the static synchronizing compensator unit 10 They cancel each other out.

[0170] in: Indicates TSC group The change in reactive power generated by the switching action is as follows: During excision .

[0171] The reactive power cancellation relationship is as follows:

[0172] ;

[0173] in: The reactive power of the static synchronous compensator unit 10 at the moment of synchronous switching is equal to its value. ; TSC Group The change in reactive power generated by the switching action is as follows: During excision .

[0174] The offsetting effect ensures that the total reactive power output of the intelligent integrated hybrid dynamic reactive power compensation control system 1 to the power grid 100 is guaranteed. Maintaining continuity before and after switching avoids sudden voltage changes and current surges at the common connection point 101.

[0175] Secondly, the impedance parameter feedforward mapping table storage module 302 and the steady-state fine-tuning control unit 3041 of the STATCOM controller 304 work together to ensure that the static synchronous compensator unit 10 is in the TSC group It can maintain optimal control performance even after switching. (When TSC group) After switching, the system impedance state The change corresponds to the equivalent system impedance. The changes also occur. The active transient pre-suppression coordinator 303 retrieves and loads a new set of optimal control parameters from the mapping table based on the new system impedance state. The steady-state fine-tuning control unit 3041 is then activated. This process enables the control parameters of the STATCOM controller 304 to dynamically adapt to changes in the equivalent system impedance, maintaining the stability and fast response characteristics of the control loop.

[0176] Synergistic effect will TSC group The large-capacity, step-like reactive power compensation is combined with the rapid, continuous reactive power regulation of the static synchronous compensator unit 10. (TSC group) It is responsible for providing most of the reactive power, reducing the capacity requirement of the static synchronizing compensator unit 10. The static synchronizing compensator unit 10, through its dual operating modes and three-stage handover control process, smoothly absorbs the reactive power of the TSC group. The reactive power impact at the moment of switching is precisely compensated for the subtle fluctuations in the reactive power of the load.

[0177] In summary, this invention achieves overall optimization of the reactive power compensation system through precise coordinated control of STATCOM and TSC. The intelligent integrated hybrid dynamic reactive power compensation control system 1 effectively suppresses transient impacts during reactive power switching while providing the required reactive power capacity compensation, thus improving the voltage stability and power quality of the power grid 100.

Claims

1. An intelligent integrated hybrid dynamic reactive power compensation control system, characterized in that, the system comprises: an execution unit connected in parallel to a point of common coupling of a power grid for compensating reactive power of a load, the execution unit comprising: a static synchronous compensator unit for providing continuously adjustable reactive power; a thyristor switched capacitor unit comprising a plurality of groups of TSC groups, each group of TSC groups being connected in parallel to the point of common coupling; an intelligent control unit connected in signal connection with the execution unit, the intelligent control unit comprising: a system state monitoring module for calculating a current impedance combination state of the system; an impedance parameter feedforward mapping table storage module for storing mapping relationship data between the system impedance combination state and optimal control parameters of the static synchronous compensator unit; an active transient pre-suppression coordinator connected with the system state monitoring module, the impedance parameter feedforward mapping table storage module, a static synchronous compensator unit controller and a thyristor switched capacitor unit controller, respectively, for triggering switching decisions of the thyristor switched capacitor unit according to the system operating state, and performing a three-stage handover control process to realize collaborative control of the static synchronous compensator unit and the thyristor switched capacitor unit.

2. The intelligent integrated hybrid dynamic var compensation control system of claim 1, wherein, The static synchronous compensator unit is a voltage source inverter, and the static synchronous compensator unit is connected to the point of common coupling through a coupling transformer; each group of TSC groups of the thyristor switched capacitor unit comprises a thyristor valve and a capacitor in series.

3. The intelligent integrated hybrid dynamic var compensation control system of claim 1, wherein, The system further comprises a sensor group for monitoring, the sensors comprising a voltage sensor arranged at the point of common coupling, a first current sensor arranged at the load side, a second current sensor for measuring the output current of the static synchronous compensator unit, and a plurality of third current sensors for measuring the currents of a plurality of groups of TSC groups, respectively; the signal input end of the intelligent control unit is connected with the signal output ends of the voltage sensor, the first current sensor, the second current sensor and the plurality of third current sensors for receiving real-time voltage and current sampling values.

4. The intelligent integrated hybrid dynamic var compensation control system of claim 1, wherein, The system state monitoring module receives voltage sampling data and current sampling data of the point of common coupling, and calculates grid-side reactive power, load reactive power and the current impedance combination state of the system according to the sampling data; The mapping relationship data stored in the impedance parameter feedforward mapping table storage module comprises indexes of a plurality of system impedance combination states and corresponding optimal control parameter sets of the static synchronous compensator unit, and the optimal control parameter set comprises proportional gain parameters and integral gain parameters.

5. The intelligent integrated hybrid dynamic var compensation control system of claim 1, wherein, The intelligent control unit further comprises a static synchronous compensator unit controller and a thyristor switched capacitor unit controller; The static synchronous compensator unit controller is used for controlling the reactive power output of the static synchronous compensator unit, and is configured in a steady-state fine adjustment mode and a transient handover mode; The thyristor switched capacitor unit controller is used for controlling switching of the thyristor switched capacitor unit.

6. The intelligent integrated mixed dynamic var compensation control system according to claim 1, wherein, In the steady-state fine-tuning mode of the static synchronous compensator unit controller, a steady-state fine-tuning control unit is activated to perform closed-loop reactive power control, control parameters of which are dynamically loaded by the active transient pre-suppression coordinator, the steady-state fine-tuning control unit receives load reactive power as a total reactive compensation target of the system and receives total reactive power provided by the compensation system as feedback, the steady-state fine-tuning control unit calculates reactive error and generates reactive current instruction of the static synchronous compensator unit according to the reactive error and the loaded control parameters.

7. The intelligent integrated mixed dynamic var compensation control system of claim 1, wherein, In the transient handover mode of the static synchronous compensator unit controller, a transient fine-tuning control unit is activated to perform open-loop reactive power ramp control, the transient handover control unit receives transient pre-loaded target value and ramp transition time from the active transient pre-suppression coordinator, the transient handover control unit is started at the mode switching time, acquires reactive power of the static synchronous compensator unit at this moment, and generates reactive power ramp instruction, which linearly changes from the reactive power of the static synchronous compensator unit at the starting time to the transient pre-loaded target value.

8. The intelligent integrated mixed dynamic var compensation control system of claim 1, wherein, The thyristor switched capacitor unit controller internally contains a voltage zero-crossing detection unit for monitoring voltage zero-crossing point of the thyristor valve; When receiving the action instruction of the active transient pre-suppression coordinator, the thyristor switched capacitor unit controller sends a trigger pulse signal at the time when the voltage zero-crossing point is detected.

9. The intelligent integrated mixed dynamic var compensation control system of claim 1, wherein, The active transient pre-suppression coordinator continuously monitors reactive power of the static synchronous compensator unit, and pre-sets upper threshold of the thyristor switched capacitor unit and lower threshold of the thyristor switched capacitor unit; When the reactive power of the static synchronous compensator unit meets the upper threshold and lasts for a pre-set delay time, the thyristor switched capacitor unit triggering decision is triggered; When the reactive power of the static synchronous compensator unit meets the lower threshold and lasts for a pre-set delay time, the thyristor switched capacitor unit triggering decision is triggered.

10. The intelligent integrated mixed dynamic var compensation control system of claim 1, wherein, The three-stage handover control process includes: In the transient pre-loading stage, the static synchronous compensator unit controller switches to the transient handover mode and controls the reactive power of the static synchronous compensator unit to linearly change from the current value to the transient pre-loaded target value; In the synchronous switching stage, at the end of the transient pre-loading stage, the thyristor switched capacitor unit controller triggers or removes the corresponding TSC group, while the active transient pre-suppression coordinator determines the new system impedance combination state after switching and retrieves the optimal control parameter set corresponding to the new system impedance combination state from the impedance parameter feed-forward mapping table storage module, and instructs the static synchronous compensator unit controller to switch back to the steady-state fine-tuning mode and load the optimal control parameter set; In the new steady-state recovery stage, the static synchronous compensator unit controller performs closed-loop reactive control using the new optimal control parameter set, so that the compensation system smoothly transitions to a new working point.

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