CN109617091B - Dynamic reactive power compensation device control strategy verification system - Google Patents
Dynamic reactive power compensation device control strategy verification system Download PDFInfo
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- CN109617091B CN109617091B CN201811533885.6A CN201811533885A CN109617091B CN 109617091 B CN109617091 B CN 109617091B CN 201811533885 A CN201811533885 A CN 201811533885A CN 109617091 B CN109617091 B CN 109617091B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
Abstract
The invention discloses a dynamic reactive power compensation device control strategy verification system, which comprises: the system comprises a main circuit simulation module, a new energy power station and power grid simulation module, an optical fiber conversion interface, a level conversion interface and a man-machine interaction interface. The dynamic reactive power compensation device control strategy verification system simulates various complicated power grid operation conditions, and can give out feedback signals of the device link system according to the needs, so that wiring and debugging are simple and convenient; the method can verify various control strategies of the dynamic reactive power compensation device, perform off-line optimization on the control performance of the dynamic reactive power compensation device, greatly shorten the debugging and starting period before on-site operation, realize off-line verification and off-line parameter optimization on the control strategy of the dynamic reactive power compensation device, and solve the problems that a part of new energy power stations are put into operation for the dynamic reactive power compensation device to perform operation performance optimization, but the on-line parameter optimization cannot be performed due to the limitation of on-site operation conditions.
Description
Technical Field
The invention belongs to the field of new energy access and control, and provides a control strategy verification system of a dynamic reactive power compensation device.
Background
The wind power plant/photovoltaic power station in China mostly adopts a development mode of 'large-scale centralized development and high-voltage remote sending', and in recent years, the wind power/photovoltaic grid-connected capacity is continuously increased, and the reactive voltage control problem is increasingly prominent when large-scale new energy is accessed into a weak-end power grid. The reactive compensation device can improve the wind power/photovoltaic dynamic supporting capability and is beneficial to the fault recovery of the power grid. However, from the practical operation situation, the control performance of the dynamic reactive power compensation device of the new energy power station has a plurality of problems, especially the control strategy of the basic control is imperfect, the low voltage ride through and abnormal condition locking control strategy is lacked, and the safe and stable operation of the power grid is seriously affected. Large-scale off-grid accident analysis of a plurality of new energy power stations shows that the imperfect control strategy of the matched dynamic reactive power compensation device is one of the important reasons for fault expansion. Since 2013, typical tests of grid-connected performance of the dynamic reactive power compensation device are carried out in the domestic part of the area, and the steady state regulation characteristic, the fault ride-through capability and the abnormal locking function of the dynamic reactive power compensation device are key technical indexes for examination as the safe operation of a new energy power station, the dynamic reactive power compensation device and a power grid is involved. The technical performance and the test standard of the reactive power compensation device of the wind power plant of the industry standard Q/GDW 11064-2013 and the reactive power compensation technical standard of the photovoltaic power station of the national standard GBT 29321-2012 provide specific requirements on the control mode and the fault ride-through capability of the dynamic reactive power compensation device of the wind power plant/photovoltaic power station.
The dynamic reactive power compensation device of the new energy power station generally comprises a static dynamic reactive power generator (SVG), a Thyristor Controlled Reactor (TCR), a magnetic valve type controllable reactor (MCR), a static reactive power compensator (SVC) and other dynamic reactive power compensation devices; the control strategy mainly comprises the following steps: voltage control strategy, reactive voltage integrated control strategy (power factor control), fault ride-through control strategy and abnormal condition lockout control strategy.
At present, as the voltage regulating capability of domestic fans/photovoltaic inverters is not fully utilized, most dynamic reactive power compensation devices are the only reactive power sources of new energy power stations, and the control strategy is correct and the reasonable setting value of control parameters is particularly important. From the network performance test situation of the developed dynamic reactive power compensation device, most dynamic reactive power compensation devices have imperfect/missing control strategies or the control effect corresponding to the actually set parameter setting value cannot reach the expected effect, and a quick, economical and effective method for verifying the correctness of the control strategies and the rationality of the parameter setting value is urgently needed.
The existing method for verifying the correctness of the control strategy has the following defects: 1. the method has the advantages that the number of the operation parts is large, the test conditions are complex, and the influence factors are large during the field test, so that the period for finding and solving the problems is long; 2. the test results of the dynamic reactive power compensation devices of the same model at different installation sites have larger difference; 3. different field technicians debug the same model dynamic reactive power compensation device, and the test results have larger difference possibly caused by the lack of a control strategy or the difference of parameter setting values, so that the problem reasons are often difficult to find; 4. the power factor control capability (namely voltage reactive comprehensive control) of the dynamic reactive power compensation device is limited by various factors such as the power grid environment, so that the test period is greatly prolonged or the field test cannot be performed.
Disclosure of Invention
In view of the challenges and difficulties mentioned above, the present patent proposes a dynamic reactive compensation device control strategy verification system comprising: the system comprises a main circuit simulation module, a new energy power station and power grid simulation module, an optical fiber conversion interface, a level conversion interface and a man-machine interaction interface, wherein the main circuit simulation module performs signal interaction with a dynamic reactive power compensation device controller executing a dynamic reactive power compensation device control strategy through the optical fiber conversion interface; and the new energy power station and the power grid simulation module interact signals with the dynamic reactive power compensation device controller through the level conversion interface.
Preferably, the dynamic reactive power compensation device controller comprises a dynamic reactive power compensation device main controller and a device pulse controller.
Preferably, the main circuit simulation module simulates the running state of each power module in the dynamic reactive power compensation device after receiving the pulse control signal, and simultaneously simulates the dynamic reactive power compensation device to feed back the state signals of each power module to the dynamic reactive power compensation device controller.
Preferably, the new energy power station and the power grid simulation module correspondingly output the three-phase voltage, the three-phase current and the running state of the grid-connected switch of the dynamic reactive power compensation device of the required simulation control point according to the related parameters set by the main circuit simulation module.
Preferably, the optical fiber conversion interface receives PWM pulse signals (A0-An … …, cn) sent by the reactive compensation device controller and transmits the PWM pulse signals to the main circuit simulation module, and then the dynamic reactive compensation device power module state signals given by the main circuit simulation module are fed back to the device pulse controller.
Preferably, the level conversion interface module converts the analog control point voltage, current, new energy power station grid-connected point voltage, the dynamic reactive compensation device grid-connected switching state and grid-connected tripping and switching command signals into relevant analog quantity or switching quantity which can be identified by the dynamic reactive compensation device main controller, and sends relevant commands to the dynamic reactive compensation device main controller.
Preferably, the man-machine interaction interface is used for an operator to issue control point voltage, current, grid-connected point voltage instructions and related parameter settings, and to issue pulse instructions, grid-connected tripping instructions and real-time simulation operation parameters of the dynamic reactive compensation device to display information; the control strategy is a voltage control strategy or a reactive power voltage comprehensive control strategy or a fault ride-through control strategy or an abnormal condition locking control strategy; the dynamic reactive power compensation device is a static dynamic reactive power generator (SVG) or a Thyristor Controlled Reactor (TCR) or a magnetic valve type controllable reactor (MCR) or a static reactive power compensator (SVC).
And provides an establishment method of a control strategy verification system based on the dynamic reactive power compensation device: the method comprises the following steps:
(1): the output unit of the device pulse controller in the dynamic reactive power compensation device controller is connected with the optical fiber conversion interface in the control strategy verification system and is used for receiving the pulse control signal sent by the dynamic reactive power compensation device controller by the control strategy verification system;
(2): the state feedback signals of all power modules of the dynamic reactive power compensation device output by the main circuit simulation module are connected into the pulse controller of the device, and the power module state feedback signals are used for feeding back the simulated running states of the power modules of the dynamic reactive power compensation device to the pulse controller of the dynamic reactive power compensation device;
(3): the analog output signals and the switching value output signals in the new energy power station and the power grid simulation module are connected into a dynamic reactive power compensation device main controller through a level conversion interface, so as to simulate the running state of the power grid in real time;
(4): the switching value input signal sent by the main controller of the dynamic reactive power compensation device is connected to a control strategy verification system and is used for sending the tripping state signal of the dynamic reactive power compensation device to a new energy power station and a power grid simulation module;
(5): and (3) completing the establishment of a control strategy verification system of the dynamic reactive power compensation device, and executing a verification step to perform off-line control strategy verification on different dynamic reactive power compensation devices.
The invention has the technical effects that:
1. the dynamic reactive power compensation device control strategy verification system simulates various complicated power grid operation conditions, and can give feedback signals of a link system (namely a dynamic reactive power compensation device power module) according to requirements, so that wiring and debugging are simple and convenient;
2. the dynamic reactive power compensation device can verify various control strategies of the dynamic reactive power compensation device, including a voltage control strategy, a reactive power control strategy, a voltage reactive power comprehensive control strategy, a fault ride-through control strategy and an abnormal state locking control strategy, and has good expansibility;
3. the closed-loop simulation verification can be realized on the dynamic reactive power compensation device controller, the off-line optimization is carried out on the control performance (parameter setting value) of the dynamic reactive power compensation device, the debugging and starting period before on-site operation is greatly shortened, and the off-line verification and off-line parameter optimization of the control strategy of the dynamic reactive power compensation device are realized;
4. the method solves the problems that the running performance of the dynamic reactive power compensation device which is put into operation in part of new energy power stations needs to be optimized, but the parameters cannot be optimized offline due to the limitation of on-site running conditions.
Drawings
FIG. 1 is a schematic diagram of a dynamic reactive power compensation device control strategy verification system;
FIG. 2 is a schematic diagram of a dynamic reactive power compensation device control interval;
FIG. 3 is a schematic diagram of a grid connection point of the new energy power station and the dynamic reactive power compensation device thereof;
FIG. 4 is a voltage control strategy verification flow chart;
FIG. 5 reactive control strategy verification flow chart;
FIG. 6 is a flowchart of reactive voltage integrated control strategy (power factor control) verification;
FIG. 7 is a fault ride-through (first low pass then high pass) control strategy verification flowchart;
FIG. 8 is a flowchart of an abnormal lockout control strategy verification.
Detailed Description
The present invention is described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. The present invention will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the invention.
Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.
Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or being "connected between" two nodes, it can be directly coupled or connected to the other element or intervening elements may be present and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, it means that there are no intervening elements present between the two.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
As shown in figure 1, the new energy power station mainly connects the output electric energy of the wind power or photovoltaic grid-connected inverter with a power grid through a main transformer of the new energy power station, and an additionally installed dynamic reactive power compensation device is connected to one side of the main transformer of the new energy power station through a grid-connected point of the dynamic reactive power compensation device. The dynamic reactive power compensation device of the new energy power station generally comprises a static dynamic reactive power generator (SVG), a Thyristor Controlled Reactor (TCR), a magnetic valve type controllable reactor (MCR), a static reactive power compensator (SVC) and other dynamic reactive power compensation devices; the dynamic reactive compensation is realized by running a specific control strategy through a dynamic reactive compensation device controller, and the control strategy mainly comprises the following steps: voltage control strategy, reactive voltage integrated control strategy (power factor control), fault ride-through control strategy and abnormal condition lockout control strategy. The validity of these control strategies and the rationality of the parameter settings need to be verified by a control strategy verification system.
The structural schematic diagram of the dynamic reactive power compensation device control strategy verification system is further provided by fig. 1, and the dynamic reactive power compensation device control strategy verification system comprises: the system comprises a main circuit simulation module, a new energy power station and power grid simulation module, an optical fiber conversion interface, a level conversion interface and a man-machine interaction interface.
The main circuit simulation module is used for simulating the running state of the dynamic reactive power compensation device after different types of power modules receive the pulse control signals, and simultaneously simulating the dynamic reactive power compensation device to feed back the state signals of the power modules to the dynamic reactive power compensation device controller, wherein the dynamic reactive power compensation device controller comprises a dynamic reactive power compensation device main controller and a device pulse controller. The new energy power station and the power grid simulation module correspondingly output three-phase voltage, three-phase current and the running state of the grid-connected switch of the dynamic reactive compensation device of the simulation control point according to the relevant parameters of the set point of the main circuit simulation module;
the optical fiber conversion interface is used for receiving PWM pulse signals (A0-An … …, cn) sent by the reactive power compensation device controller and feeding back a dynamic reactive power compensation device power module state signal given by the main circuit simulation module to the dynamic reactive power compensation device pulse controller;
the level conversion interface module is used for converting the analog control point voltage, current, new energy power station grid-connected point voltage, the grid-connected switching state (switching value) of the dynamic reactive power compensation device and the grid-connected tripping and switching instruction signal into relevant analog quantity or switching value which can be identified by the dynamic reactive power compensation device main controller, and sending the relevant instruction to the dynamic reactive power compensation device main controller;
the man-machine interaction interface is used for an operator to issue instructions such as control point voltage, current and grid-connected point voltage and relevant parameters, and information such as pulse instructions, grid-connected jump instructions and real-time simulation operation parameters of the dynamic reactive power compensation device are displayed.
In order to meet the control strategy verification requirement of the dynamic reactive power compensation device, the control strategy verification system should meet the following conditions: 1. the main circuit simulation module adopts a fixed-step simulation model, and the simulation step is not more than 5us; 2. the new energy power station and the power grid simulation module adopt a fixed-step simulation model, and the simulation step is not more than 10ms; 3. the optical fiber conversion interface and the level conversion interface meet the signal transmission requirement between the dynamic reactive power compensation device controller and the control strategy verification system; the accuracy of the analog output signal is better than 0.5%; the time error of the input and output signals of the switching value is less than 1ms; the pulse time error of the chain link modulation is less than 1us; the output precision of the chain link state feedback signal is better than 0.5%.
Firstly, an output unit of a device pulse controller of a dynamic reactive power compensation device controller is connected with an optical fiber conversion interface in a control strategy verification system and is used for receiving a pulse control signal sent by the dynamic reactive power compensation device controller by the control strategy verification system; secondly, a chain link (dynamic reactive power compensation device power module) state feedback signal output by the simulation module is connected into the device pulse controller and is used for feeding back the simulated chain link running state to the dynamic reactive power compensation device pulse controller; thirdly, the analog output signals (control point voltage, current and grid-connected point voltage) and the switching value output signals in the new energy power station and the power grid simulation module are connected into a dynamic reactive power compensation device main controller through a level conversion interface, so that the running state of the power grid is simulated; finally, a switching value input signal (grid-connected tripping and closing instruction) sent by a main controller of the dynamic reactive power compensation device is connected to a control strategy verification system and is used for sending a tripping state signal of the dynamic reactive power compensation device to a new energy power station and a power grid simulation module; therefore, the dynamic reactive power compensation device control strategy verification system is built, and the off-line control strategy verification can be carried out on reactive power compensation device controllers of different models and different manufacturers.
The dynamic reactive power compensation device can be a static dynamic reactive power generator (SVG) or a Thyristor Controlled Reactor (TCR) or a magnetic valve type controllable reactor (MCR) or a static reactive power compensator (SVC).
The dynamic reactive power compensation device has various control strategies, in this example, a voltage control strategy or a reactive power control strategy or a reactive voltage comprehensive control strategy or a fault ride-through control strategy or an abnormal condition locking control strategy can be selected, and when the verification is performed through the control strategy verification system, the verification method and the verification steps are similar, and the specific verification steps are as follows.
(1) Setting a control mode of the dynamic reactive power compensation device. Such as a voltage control mode, a reactive power control mode, a power factor control mode, etc.;
(2) And correspondingly determining different control target points according to different selected control modes and different control targets. If the voltage or reactive power of the grid-connected point of the new energy power station is used as a control target, or the voltage of the grid-connected point of the dynamic reactive power compensation device is used as a control target;
(3) The control strategy verification system simulates the operation/fault states of various new energy power stations, achieves the aim of verifying the control strategy of the dynamic reactive compensation device controller, and has the following main working conditions to be verified:
a. simulating active output change of the new energy power station to cause voltage fluctuation of grid-connected points;
b. simulating external power grid changes by adjusting related grid-related parameters;
c. according to the related standard requirements, the dynamic reactive power compensation device is respectively operated in a light load state and a full load state, and the conditions that the grid voltage drops, rises or drops first and then rises are simulated (for example, the grid voltage drops to 0.2p.u., the duration is 625ms, and then the grid voltage rises to 1.3p.u., the duration is 500 ms);
d. simulating abnormal states such as abnormal bus voltage of the new energy power station, abnormal regulation instruction of the dynamic reactive power compensation device, abrupt communication interruption and the like;
e. the short-circuit capacity of the grid-connected point of the new energy power station is adjusted to be 1.0, 0.5 and 1.5 respectively, and the test working conditions required to be repeated in a-d are selected according to the related standard requirements;
(4) And recording voltage and current of the grid-connected point of the dynamic reactive power compensation device, voltage and current of the grid-connected point of the new energy power station/dynamic reactive power compensation device and response characteristic parameters (if the controller is blocked) of the controller in an abnormal state, calculating relevant data such as voltage, reactive power, active power, power factor, reactive current response time, reactive current regulation proportion coefficient and the like of the controller, and taking the data as a basis for judging the control performance of the controller of the dynamic reactive power compensation device.
(5) The test content mentioned above is only a general working condition, and the control strategy verification system can increase other working conditions according to standard requirements or actual working requirements, so that the purpose of verifying other new control strategies in the future is realized.
The following describes the implementation steps in detail, taking verification of a voltage control strategy, a reactive control strategy, a voltage reactive comprehensive control strategy (power factor), a fault ride-through control strategy and an abnormal locking control strategy of the dynamic reactive compensation device controller as examples.
(1) Voltage control strategy verification step:
a) Setting the dynamic reactive power compensation device as a constant voltage control strategy, and setting the grid-connected point short-circuit capacity of the dynamic reactive power compensation device as a reference short-circuit capacity. Setting a target voltage value V by taking the voltage of a grid-connected point of a new energy power station as a control target g The method comprises the steps that (given by a new energy power station and a power grid simulation module), fluctuation of the voltage of the grid-connected point of the new energy power station caused by fluctuation of the active power output of the grid-connected point of the new energy power station is simulated, and reactive power output value of a dynamic reactive power compensation device and voltage value of the grid-connected point of the new energy power station under fluctuation of the active power output of the grid-connected point of the new energy power station are recorded;
b) Setting a dynamic reactive power compensation device as a constant voltage control strategy, setting different control target voltage values V by taking the grid-connected point voltage of a new energy power station as a control target t Recording a grid-connected point voltage control dead zone and a reactive power output dead zone value of a dynamic reactive power compensation device under different voltage target values;
c) Setting a control mode of the dynamic reactive power compensation device as voltage curve control, taking the voltage of a grid-connected point of a new energy power station as a control target, and setting a control interval as a steady-state voltage limit value interval [ V ] d- ～V d+ ]Simulating the fluctuation of the grid-connected active output of the new energy power station to cause the fluctuation of the grid-connected voltage, and recording the reactive power output value and the grid-connected voltage value of the dynamic reactive power compensation device under the fluctuation of the grid-connected active output of the new energy power station;
d) Maintaining voltage target value V of grid-connected point of new energy power station g The voltage values of grid-connected points of a given new energy power station are respectively in [ V ] d- ～V l ]And [ V d+ ～V h ]In the interval, recording the dynamic state of the new energy power station under different grid-connected point voltage set valuesCalculating a dynamic voltage regulation proportion coefficient of the dynamic reactive power compensation device and drawing a characteristic curve according to the reactive power output value corresponding to the reactive power compensation device;
e) And (3) adjusting the short-circuit capacity of the grid-connected point of the new energy power station to be 0.5 times and 1.5 times of the reference capacity, and repeating the test steps of a) to d). The voltage/reactive power control interval of the dynamic reactive power compensation device is schematically shown in fig. 2, and the verification flow of the voltage control strategy is schematically shown in fig. 4.
(2) The reactive power control strategy verification method comprises the following steps:
a) Taking the reactive power of the grid-connected point as a control target, and gradually increasing (or decreasing) the target reactive power according to a preset step length until the reactive current output by the dynamic reactive compensation device reaches the capacitive (or inductive) rated value;
b) Keeping a reactive power target value of a grid-connected point of the device, and recording a reactive power dead zone of the dynamic reactive power compensation device and a grid-connected point active and reactive power curve when the active power of the wind power plant fluctuates;
c) Taking the reactive power of the connecting point as a control target, gradually increasing (or reducing) the target reactive power according to a preset step length until the reactive current output by the dynamic reactive compensation device reaches the capacitive (or inductive) rated value, and recording the reactive power control dead zone delta Q and the voltage of the connecting point;
d) The grid connection point of the new energy power station and the grid connection point position of the dynamic reactive power compensation device are shown in fig. 3, and the reactive power control strategy verification flow is shown in fig. 5.
(3) The voltage reactive comprehensive control strategy verification method comprises the following steps:
a) Setting different target power factor values by taking the power factor of the grid-connected point of the new energy power station as a control target, simulating the active output fluctuation of the new energy power station, recording the power factor of the grid-connected point, the active power of the grid-connected point, the reactive power of the grid-connected point and the reactive power output value of the dynamic reactive compensation device of the new energy power station under the active power fluctuation when different power factor target values are recorded, and recording a constant power factor control dead zone;
b) Setting dynamic reactive power compensation device as grid-connected point voltage of new energy power station, in figure 2 [ V ] d -～V d+ ]New energy power station and electricity when in rangeThe minimum network reactive power exchange is a control target, the active output fluctuation of the new energy power station is simulated, and the reactive power of the grid-connected point of the new energy power station and the reactive compensation dynamic reactive power output value are recorded under the active power fluctuation;
c) The voltage/reactive power control interval of the dynamic reactive power compensation device is shown in fig. 2, the grid-connected point of the new energy power station and the grid-connected point position of the dynamic reactive power compensation device are shown in fig. 3, and the verification flow of the voltage reactive power comprehensive control strategy is shown in fig. 6.
(4) Fault ride through control strategy verification method (taking voltage drop followed by rise as an example):
a) In the process of power grid faults, the grid-connected point voltage of the dynamic reactive power compensation device is used as a control target, the dynamic reactive power compensation device is controlled to rise in a two-phase and three-phase manner by the control of the fault simulation device under the conditions of inductive low-power output (0.2p.u.), inductive high-power output (1.0p.u.), capacitive low-power output (0.2p.u.), capacitive high-power output (1.0p.u.), the amplitude of the dynamic reactive power compensation device is respectively 0.9p.u. -0.02p.u., 0.50p.u.+ -. 0.02p.u., 0.20p.02p.u., 1.10p.u.+0.02p.u., 1.20p.u.+ -. 0.02p.u., and the transient state current response curve is drawn between the grid-connected point voltage of the dynamic reactive power compensation device and three-phase, and the reactive power compensation device, and the reactive current transient state response time is recorded. The voltage drop and rise indicators are shown in table 1.
b) The grid connection point of the new energy power station and the grid connection point position of the dynamic reactive power compensation device are shown in fig. 3, and the verification flow of the voltage reactive power comprehensive control strategy is shown in fig. 7.
TABLE 1 Voltage sag and rise
(5) The abnormal locking strategy verification method comprises the following steps:
simulating conditions such as abnormal bus voltage of a new energy power station, abnormal device regulation instruction, communication interruption and the like, and recording response characteristics of a dynamic reactive power compensation device controller when the abnormality occurs. The abnormal latching control strategy verification flow is shown in fig. 8.
After the control strategy is verified, whether the dynamic reactive power compensation device controller meets the requirements or not can be evaluated by referring to the following indexes:
a. within the steady-state voltage limit interval, the voltage control deviation should be less than + -0.1%;
b. reactive power control strategy: the overshoot rate is less than 2% during step output, and the steady-state control deviation is better than 1%;
c. voltage reactive comprehensive control strategy: under the condition of qualified voltage, the power factor meets the requirements of a local dispatching mechanism;
d. failure traditional control strategy: the reactive current regulation coefficient of the fault phase is greater than 1.5;
e. abnormal locking: when the strategy electric quantity is abnormal, reactive locking is output and alarming is carried out; when the adjusting instruction or the step size is over the limit, the method is not executed; and locking reactive power output and alarming when communication is abnormal.
By the control strategy verification system provided by the invention, the voltage control strategy, reactive power voltage comprehensive control strategy, fault ride-through control strategy and abnormal locking strategy of the dynamic reactive power compensation device required by relevant standards are verified or optimized, so that economic and time cost caused by on-site test delay/delay or technical transformation due to the loss of the control strategy of the dynamic reactive power compensation device is reduced; the difference of the setting values of the parameters of the controller of the dynamic reactive compensation device caused by different technical capacities of field debugging personnel and other factors is eliminated, and the dynamic reactive compensation device is not limited by field conditions; only the controller of the dynamic reactive power compensation device is required to be sent to a laboratory for verification/optimization, and the field test is not required, so that a large amount of manpower and material resources are saved; by using the control strategy verification system, not only the performance of the dynamic reactive power compensation device controller can be verified, but also the parameter optimization can be performed on the dynamic reactive power compensation device controller, and the optimal control parameter setting is finally realized through test-optimization-test-optimization … …; the control strategy verification method of the dynamic reactive power compensation device is simple and feasible, is convenient to operate, and can comprehensively verify the effectiveness of different control strategies of the dynamic reactive power compensation device; the dynamic reactive power compensation device control strategy verification system has good expansion characteristics, and can meet the requirements of verification/parameter optimization of various other new control strategies of the dynamic reactive power compensation device in the future.
Only the preferred embodiments of the present invention have been described herein, but it is not intended to limit the scope, applicability, and configuration of the invention. Rather, the detailed description of the embodiments will enable those skilled in the art to practice the embodiments. It will be understood that various changes and modifications may be made in the details without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A dynamic reactive power compensation device control strategy verification system, comprising: the system comprises a main circuit simulation module, a new energy power station and power grid simulation module, an optical fiber conversion interface, a level conversion interface and a man-machine interaction interface, wherein the main circuit simulation module performs signal interaction with a dynamic reactive power compensation device controller executing a dynamic reactive power compensation device control strategy through the optical fiber conversion interface; the new energy power station and the power grid simulation module interact with the dynamic reactive power compensation device controller through a level conversion interface;
the dynamic reactive power compensation device controller comprises a dynamic reactive power compensation device main controller and a device pulse controller;
the main circuit simulation module simulates the running state of each power module in the dynamic reactive power compensation device after receiving the pulse control signal, and simultaneously simulates the dynamic reactive power compensation device to feed back the state signals of each power module to the dynamic reactive power compensation device controller;
the new energy power station and the power grid simulation module correspondingly output the three-phase voltage and the three-phase current of the required simulation control point and the running state of the grid-connected switch of the dynamic reactive compensation device according to the related parameters set by the main circuit simulation module;
the optical fiber conversion interface receives PWM pulse signals A0-An … … and Cn sent by the reactive power compensation device controller, transmits the PWM pulse signals A0-An … … and Cn to the main circuit simulation module, and feeds back a dynamic reactive power compensation device power module state signal given by the main circuit simulation module to the device pulse controller;
the level conversion interface module converts the simulated control point voltage, current, new energy power station grid-connected point voltage, the dynamic reactive power compensation device grid-connected switching state and grid-connected tripping and closing instruction signals into relevant analog quantity or switching quantity which can be identified by the dynamic reactive power compensation device main controller, and sends relevant instructions to the dynamic reactive power compensation device main controller;
the man-machine interaction interface is used for an operator to issue control point voltage, current, grid-connected point voltage instructions and related parameter settings, and the dynamic reactive power compensation device issues pulse instructions, grid-connected tripping instructions and real-time simulation operation parameter information of the dynamic reactive power compensation device to display;
the control strategy is a voltage control strategy or a reactive power voltage comprehensive control strategy or a fault ride-through control strategy or an abnormal condition locking control strategy.
2. A dynamic reactive power compensation device control strategy verification system according to claim 1, wherein the dynamic reactive power compensation device is a static dynamic reactive power generator SVG or a thyristor controlled reactor TCR or a magnetic valve controlled reactor MCR or a static reactive power compensator SVC;
the method for establishing the dynamic reactive power compensation device control strategy verification system comprises the following steps: the method comprises the following steps:
(1): the output unit of the device pulse controller in the dynamic reactive power compensation device controller is connected with the optical fiber conversion interface in the control strategy verification system and is used for receiving the pulse control signal sent by the dynamic reactive power compensation device controller by the control strategy verification system;
(2): the state feedback signals of all power modules of the dynamic reactive power compensation device output by the main circuit simulation module are connected into the pulse controller of the device, and the power module state feedback signals are used for feeding back the simulated running states of the power modules of the dynamic reactive power compensation device to the pulse controller of the dynamic reactive power compensation device;
(3): the analog output signals and the switching value output signals in the new energy power station and the power grid simulation module are connected into a dynamic reactive power compensation device main controller through a level conversion interface, so as to simulate the running state of the power grid in real time;
(4): the switching value input signal sent by the main controller of the dynamic reactive power compensation device is connected to a control strategy verification system and is used for sending the tripping state signal of the dynamic reactive power compensation device to a new energy power station and a power grid simulation module;
(5): and (3) completing the establishment of a control strategy verification system of the dynamic reactive power compensation device, and executing a verification step to perform off-line control strategy verification on different dynamic reactive power compensation devices.
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