CN111459048A - SVG control hardware-in-loop simulation platform and simulation method - Google Patents

SVG control hardware-in-loop simulation platform and simulation method Download PDF

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CN111459048A
CN111459048A CN202010168268.1A CN202010168268A CN111459048A CN 111459048 A CN111459048 A CN 111459048A CN 202010168268 A CN202010168268 A CN 202010168268A CN 111459048 A CN111459048 A CN 111459048A
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power
voltage
real
grid
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Inventor
刘纯
何国庆
李光辉
高丽萍
张柏林
邵冲
张兴
李丽娜
孙艳霞
刘可可
徐宏雷
何欣
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Jiangsu Electric Power Co Ltd
State Grid Gansu Electric Power Co Ltd
Electric Power Research Institute of State Grid Gansu Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Jiangsu Electric Power Co Ltd
State Grid Gansu Electric Power Co Ltd
Electric Power Research Institute of State Grid Gansu Electric Power Co Ltd
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Priority to CN202010168268.1A priority Critical patent/CN111459048A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B17/00—Systems involving the use of models or simulators of said systems
    • G05B17/02—Systems involving the use of models or simulators of said systems electric
    • 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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a simulation platform and a simulation method of an SVG control hardware-in-loop, which comprises the following steps: the system comprises a workstation, an SVG controller and a real-time simulator; the real-time simulator is used for simulating an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting-end system of the new energy base and verifying whether the SVG controller is off-line; the real-time simulator is respectively connected with the workstation and the SVG controller; the workstation is used for issuing a test instruction to the real-time simulator based on a disturbance test of the power grid voltage of the sending end system; the workstation is also used for acquiring test process information executed by the SVG circuit topology model based on the test instruction through the real-time simulator to monitor the test; wherein, the disturbance test of sending end system grid voltage includes: high voltage ride through, low voltage ride through and commutation failure disturbance tests; the simulation and reproduction of the transient working condition on site are realized; the method is beneficial to mastering the transient operation characteristic of the reactive power compensation device of the new energy base, and provides a reasonable operation control strategy of the new energy grid-connected equipment.

Description

SVG control hardware-in-loop simulation platform and simulation method
Technical Field
The invention belongs to the technical field of electromagnetic transient simulation of an SVG reactive power compensation device of a new energy power generation base, and relates to an SVG control hardware-in-loop simulation platform and a simulation method.
Background
The existing power generation units and reactive power compensation devices of the new energy cluster sending-out system have large restriction on the direct current sending-out capacity due to a fault ride-through control strategy, voltage tolerance capacity and a reactive/voltage control strategy, a direct current sending end is weak in power grid and insufficient in supporting capacity, and faults such as direct current commutation failure and locking easily cause a large number of power generation units to be in linkage disconnection. Due to the fact that the wind turbine generator, the photovoltaic power generation unit and the dynamic reactive power compensation device are complex in voltage regulation characteristic, dispersed in control target and lack of coordination control, the whole new energy power generation base in an actual power grid is opposite to a conventional power supply in voltage regulation characteristic, and the power grid adaptability is not strong. In order to solve the problems, research on dynamic characteristics of a reactive power compensation device is urgently needed, an optimization control strategy is proposed, and the stability level of a weak grid extra-high voltage direct current transmission end system is improved.
In consideration of the advancement of the technology, the reactive power compensation devices configured in the alternating current collection station of the large-scale new energy power generation base are mainly static reactive power compensation devices (SVG), which generally comprise 35kV direct-hanging SVG and 10kV boost SVG, and the compensation capacities of the SVG and the SVG are respectively about 30MVar and 10 MVar. The SVG has important functions in the aspects of improving the power output of a power grid, power factors of the power grid and suppressing system harmonics, and because the SVG has high application field voltage level and large compensation capacity, a large number of tests and multi-working-condition tests cannot be carried out on the field, the transient response characteristics of the SVG need to be deeply researched and explored by a simulation means.
Disclosure of Invention
The invention provides an SVG control hardware-in-loop simulation platform and a simulation method, which aim at the problems that the fault ride-through control strategy, the voltage tolerance capability and the reactive/voltage control strategy of the existing power generation unit and reactive compensation device of a new energy cluster sending-out system have larger restriction on the direct current sending capability, the direct current sending end power grid is weak, the supporting capability is insufficient, and the faults of direct current commutation failure, locking and the like easily cause the chain off-grid deficiency of a large number of power generation units, and the invention provides the SVG control hardware-in-loop simulation platform and the simulation method, which have the following specific:
an SVG control hardware-in-the-loop simulation platform, comprising: the system comprises a workstation, an SVG controller and a real-time simulator;
the real-time simulator is used for simulating an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting end system of the new energy base and verifying whether the SVG controller is off-line;
the real-time simulator is respectively connected with the workstation and the SVG controller;
the workstation is used for issuing a test instruction to the real-time simulator based on the disturbance test of the power grid voltage of the sending end system; the workstation is also used for acquiring test process information executed by the SVG circuit topology model based on the test instruction through the real-time simulator to monitor the test;
wherein, the disturbance test of sending end system grid voltage includes: and (3) carrying out perturbation tests on high voltage ride through, low voltage ride through and commutation failure.
Preferably, the SVG controller comprises a main control device and a valve control device; the simulation platform further comprises an optical fiber interface converter;
the real-time simulator is connected with the master control equipment of the SVG controller, and the real-time simulator is also connected with the valve control equipment of the SVG controller through an optical fiber interface converter.
Preferably, the real-time simulator includes: the short-circuit ratio sub-module, the functional sub-module, the I/O port and the high-speed optical fiber interface;
the short-circuit ratio submodule is used for changing the equivalent impedance of the simulated power supply of the power grid to obtain different short-circuit ratios of the power system so as to obtain different power grid strengths;
the function sub-module is used for disturbing the power grid voltage of the transmitting-end system based on the simulated SVG circuit topology model and the different power grid intensities to obtain the simulated power grid system voltage/current/SVG current analog quantity and the switch digital quantity in the SVG controller;
the high-speed optical fiber interface is connected with a low-speed optical fiber interface of valve control equipment of the SVG controller through the optical fiber interface converter, and is used for receiving a pulse trigger signal sent by the SVG controller to a model in the simulator and also used for transmitting a power module capacitance voltage signal to the SVG controller by the SVG circuit topology model in the real-time simulator; and the I/O port is used for transmitting the power grid system voltage/current/SVG current analog quantity and the switch digital quantity in the SVG controller obtained by the simulation of the real-time simulator to the SVG controller through the main control equipment.
Preferably, the I/O port includes: an SVG switch control signal DI port, an SVG switch feedback signal DO port and an analog signal AO port;
the port of the SVG switch control signal DI is connected with the corresponding port of the main control equipment of the SVG controller and is used for receiving a main circuit breaker control signal and a bypass switch control signal issued by the SVG controller;
the feedback signal DO port of the SVG switch is connected with a corresponding port of a main control device of the SVG controller and used for sending a main breaker state and a bypass switch state returned by a SVG circuit topology model in the real-time simulator to the SVG controller;
the analog signal AO port is connected with a corresponding port of a main control device of the SVG controller and used for sending 35kV line voltage signals, 35kV phase current signals, 110kV line voltage signals, 110kV phase current signals and SVG phase currents of an SVG circuit topology model in the real-time simulator to the SVG controller.
Preferably, the short circuit ratio sub-module includes: a system short circuit capacity unit, a device short circuit capacity unit and a short circuit ratio calculation unit;
the system short-circuit capacity unit is used for calculating the system short-circuit capacity based on the equivalent inductive reactance of the power grid power supply, the equivalent resistance of the power grid power supply, the system rated capacity and the system power grid voltage;
the device short-circuit capacity unit is used for calculating the device short-circuit capacity based on the capacities of the power generation units and the compensation device;
the short circuit ratio calculation unit is used for calculating a system short circuit ratio based on the system short circuit capacity and the system short circuit capacity.
Preferably, the optical fiber interface converter includes: the signal triggering submodule and the capacitor voltage returning submodule;
the signal triggering sub-module is used for converting the low-speed optical fiber into a high-speed optical fiber after analyzing and recompiling the low-speed optical fiber of the valve control equipment, and transmitting a pulse triggering signal of the SVG controller to the real-time simulator through the high-speed optical fiber interface;
and the capacitance voltage feedback sub-module is used for converting a power module capacitance voltage signal of the SVG circuit topology model output by a high-speed optical fiber into a low-speed optical fiber and transmitting the low-speed optical fiber signal to the SVG controller through the low-speed optical fiber interface of the valve control device.
Preferably, the simulation platform further comprises an analysis module;
and the analysis module is used for analyzing the transient reactive response characteristic of the SVG based on a disturbance test of the grid voltage of the transmitting end system performed by the real-time simulator.
Preferably, the analysis module includes: a characteristic parameter calculation submodule;
and the characteristic parameter calculation submodule is used for calculating the line loss of a new energy base transmitting system, calculating the power of a grid-connected point system, setting the power of an SVG device, calculating the power emitted by a new energy station, calculating the power of a transmitting system grid and calculating the grid-connected voltage of the new energy station based on the voltage/current/SVG current analog quantity of a power grid system and the switch digital quantity in the SVG controller which are obtained by simulation under different power grid strengths and in a constant reactive power control or constant voltage control mode.
Preferably, the SVG circuit topology model and the model parameters are determined based on the selection of a filter reactance, the determination of the conversion relation between a power module and an alternating-current line voltage, the calculation of the number of the power modules, the calculation of the equivalent switching frequency of an SVG alternating-current port and the calculation of the equivalent level number of the SVG alternating-current port line voltage.
A simulation method based on an SVG control hardware-in-the-loop simulation platform comprises the following steps:
the real-time simulator simulates an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting end system of the new energy base based on a test instruction issued by the workstation, and verifies whether the SVG controller is off-line;
the real-time simulator receives test process information executed by the SVG controller based on the disturbance experiment and sends the information to the workstation;
the test instruction issued by the workstation is determined by a disturbance test of the workstation based on the grid voltage of the sending end system; the disturbance test of the grid voltage of the sending end system comprises the following steps: and (3) carrying out perturbation tests on high voltage ride through, low voltage ride through and commutation failure.
Preferably, real-time simulator is based on the test instruction that the workstation was assigned, and the disturbance test of sending end system power grid voltage that the SVG circuit topology model and the model parameter of simulation carry out the new forms of energy base verifies whether the SVG controller is off-line, includes:
the real-time simulator changes the simulated equivalent impedance of the power supply of the power grid based on a test instruction issued by the workstation to obtain different short-circuit ratios of the power system so as to obtain different power grid strengths;
the simulated power grid system voltage/current/SVG current analog quantity and the switch digital quantity in the SVG controller are obtained based on the simulated SVG circuit topology model and the different power grid intensity disturbance transmitting end system power grid voltages;
and the SVG circuit topology model in the real-time simulator transmits a power module capacitance voltage signal to the SVG controller through the high-speed optical fiber interface, and receives a pulse trigger signal sent by the SVG controller to the model in the simulator through the high-speed optical fiber interface.
Preferably, the real-time simulator receives test process information executed by an SVG controller based on the perturbation experiment, and sends the information to the workstation, and the method includes:
the real-time simulator transmits the voltage/current/SVG current analog quantity of the power grid system and the switch digital quantity in the SVG controller to a main control device of the SVG controller through an SVG switch feedback signal DO port and an analog signal AO port;
the real-time simulator acquires a switch control command fed back by a main circuit breaker and a bypass switch of the SVG controller and a pulse trigger signal fed back by a valve control device of the SVG controller through the optical fiber interface converter, and sends the switch control command and the pulse trigger signal to the workstation.
Preferably, the real-time simulator changes the simulated equivalent impedance of the power supply of the power grid based on a test instruction issued by the workstation to obtain different short-circuit ratios of the power system, so as to obtain different power grid strengths, and includes:
calculating the short-circuit capacity of the system based on the equivalent inductive reactance of the power grid, the equivalent resistance of the power grid, the rated capacity of the system and the voltage of the system power grid;
calculating device short circuit capacity based on the capacity of each power generation unit and the compensation device;
a system short ratio is calculated based on the system short capacity and the system short capacity.
Preferably, SVG circuit topology model among the real-time simulation ware sends power module capacitance voltage signal for the SVG controller through high-speed fiber interface to receive the pulse trigger signal that the SVG controller issued for the model among the simulation ware through high-speed fiber interface, include:
the optical fiber interface converter analyzes and recompiles the low-speed optical fiber of the valve control equipment, converts the low-speed optical fiber into a high-speed optical fiber, and transmits a pulse trigger signal of the SVG controller to the real-time simulator through the high-speed optical fiber interface;
the optical fiber interface converter converts a power module capacitance voltage signal of the SVG circuit topology model output by a high-speed optical fiber into a low-speed optical fiber, and the low-speed optical fiber is transmitted to the SVG controller through the low-speed optical fiber interface of the valve control device;
preferably, the method further comprises:
and analyzing the transient reactive response characteristic of the SVG based on the disturbance test of the power grid voltage of the transmitting end system by the real-time simulator.
Preferably, the analyzing the SVG transient reactive response characteristics based on the disturbance test of the grid voltage of the sending end system performed by the real-time simulator includes:
and calculating the line loss of a new energy base transmitting end system, calculating the power of a grid-connected point system, setting the power of an SVG device, calculating the power of a new energy station, calculating the power of a transmitting end system and calculating the grid-connected voltage of the new energy station under the conditions of the voltage/current/SVG current analog quantity of the power grid system and the switching digital quantity in the SVG controller which are obtained by simulation under different power grid strengths and a constant reactive power control or constant voltage control mode.
Preferably, the calculation formula of the grid power of the sending-end system is as follows:
Figure BDA0002408173770000051
in the formula,
Figure BDA0002408173770000052
for the grid power of the sending-end system,
Figure BDA0002408173770000053
in order to obtain the power of the point-to-point system,
Figure BDA0002408173770000054
in order to reduce the line loss of the system,
Figure BDA0002408173770000055
the power generated by the new energy station,
Figure BDA0002408173770000056
for SVG device power, PFDFor active power of new energy stations, PSVGFor SVG devices active power, QFDFor SVG devices reactive power, QFDFor reactive power, delta P, of a new energy stationZ、ΔQZActive and reactive power, P, respectively, of system line losses1、Q1Respectively the active power and the reactive power of the power grid.
Preferably, the new energy station grid-connected voltage has the following calculation formula:
Figure BDA0002408173770000061
in the formula,
Figure BDA0002408173770000062
is the grid-connected voltage of the new energy station,
Figure BDA0002408173770000063
for wind farm grid-connected voltage, U1For ideal grid voltage of a new energy base sending end system, R is system line resistance, X is system line reactance, and R + jX is system line equivalent impedance;
wherein, the active power P of the power grid1The expression of (a) is:
P1＝PFD-PSVG-ΔPZ
reactive power Q of power grid1The expression of (a) is:
Q1＝QFD-QSVG-ΔQZ
compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a simulation platform of an SVG control hardware-in-loop, which comprises: the system comprises a workstation, an SVG controller and a real-time simulator; the real-time simulator is used for simulating an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting end system of the new energy base and verifying whether the SVG controller is off-line; the real-time simulator is respectively connected with the workstation and the SVG controller; the workstation is used for issuing a test instruction to the real-time simulator based on the disturbance test of the power grid voltage of the sending end system; the workstation is also used for acquiring test process information executed by the SVG circuit topology model based on the test instruction through the real-time simulator to monitor the test; wherein, the disturbance test of sending end system grid voltage includes: high voltage ride through, low voltage ride through and commutation failure disturbance tests; the simulation and reproduction of the transient working condition on site are realized, and the real-time simulation verification can be carried out on the working condition of the single machine equipment at any time;
2. the SVG control hardware-in-loop simulation platform and the simulation method provided by the invention provide a simulation analysis tool for analyzing the transient characteristics of the reactive power compensation device of a large new energy base, are favorable for mastering the transient operation characteristics of the reactive power compensation device of the new energy base, and provide a reasonable operation control strategy of new energy grid-connected equipment.
Drawings
FIG. 1 is a schematic diagram of an SVG control hardware-in-loop simulation platform provided by the present invention;
FIG. 2 is a topological structure diagram of an SVG main circuit provided by the present invention;
fig. 3 is a circuit topology diagram of the new energy cluster sending-out system provided by the present invention.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
Example 1:
the application provides a SVG control hardware is at emulation platform of ring, explains with fig. 1, specifically includes:
the real-time simulator is used for simulating an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting-end system of the new energy base and verifying whether the SVG controller is off-line;
the workstation is used for issuing a test instruction to the real-time simulator based on the disturbance test of the power grid voltage of the sending end system; the workstation is also used for acquiring test process information executed by the SVG circuit topology model based on the test instruction through the real-time simulator to monitor the test;
wherein, real-time emulation ware for the disturbance test of simulation SVG circuit topology model and model parameter in order to carry out the send end system electric network voltage at new forms of energy base verifies whether the SVG controller is off-line, specifically includes:
the SVG control hardware-in-loop simulation platform consists of a test management workstation, a real-time simulator, an optical fiber interface converter and an SVG controller. The real-time simulator has the functions of real-time operation of a mathematical model, real-time I/O port configuration and the like, controls functional modules in the circuit topology model, simulates the circuit topology model in the graph 2 and finally downloads the circuit topology model into the simulator through a workstation for operation; the optical fiber interface converter completes communication between the SVG valve control device and the simulation platform, analyzes and recompiles a large number (hundreds) of low-speed optical fibers of the SVG valve control device through a communication protocol, converts the low-speed optical fibers into a small number (generally 1 to 3 pairs) of high-speed optical fibers to be connected into the simulator, and completes data transmission of power module capacitance voltage, IGBT trigger signals and the like; the SVG controller is a real device, the main control equipment of the SVG controller is connected with the simulator to finish the acquisition of analog quantity and digital quantity, and the valve control equipment is connected with the optical fiber interface converter to finish the optical fiber data communication. The simulation platform can carry out overall test on all aspects of the performance of the controller of the SVG, can verify the conditions of the existing software control algorithm, control strategy, equipment performance, response state under abnormal working conditions and the like of the SVG controller, and can find problems in the controller in time.
The workstation sends a test instruction to the real-time simulator based on the disturbance test of the grid voltage of the sending end system; the workstation is still used for through the real-time simulator obtains the SVG circuit topology model is based on the test procedure information that test instruction executed is right the test is monitored, specifically includes:
the test management workstation is a test host and realizes the functions of model development, test management, automatic test, graph monitoring and the like.
Example 2:
the application provides a simulation method based on an SVG control hardware-in-loop simulation platform, which takes 35kV direct-hanging SVG accessing to a 110kV transmitting-end power grid as an example to explain the SVG transient reactive characteristic simulation method based on the control hardware-in-loop. As shown in fig. 2, in the main circuit topology structure of the 35kV direct-hanging SVG, the SVG is a multi-level reactive power unit formed by connecting a plurality of IGBT rectifier modules in series, and is connected to a 110kV grid through a step-up transformer after being connected to a device impedance and a charging resistor. The SVG device detects the voltage and current of a power grid at a compensation side (35kV or 110kV side), and the control device sends or absorbs reactive power to complete a reactive compensation function. The SVG reactive power compensation device generally adopts a double closed-loop control structure of a voltage outer loop and a current inner loop. The voltage outer ring is used for controlling direct-current voltage Udc of the reactive power compensation device, and the current inner ring is used for outputting reactive current Isvg of the reactive power compensation device. Usually, the SVG control mode is divided into a constant power mode, a constant voltage mode, a constant current mode, a constant power factor mode and the like according to the requirement, and specifically includes:
step 1: the real-time simulator simulates an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting end system of the new energy base based on a test instruction issued by the workstation, and verifies whether the SVG controller is off-line;
step 2: the real-time simulator receives test process information executed by the SVG controller based on the disturbance experiment and sends the information to the workstation;
wherein, the step 1: real-time simulation ware carries out the disturbance test of the send end system grid voltage of new forms of energy base based on the experimental instruction that the workstation was assigned, simulation SVG circuit topology model and model parameter, verifies whether the SVG controller is off-line, specifically includes:
(1) SVG transient reactive response characteristic under different power grid intensities and analysis of influence on power grid voltage
In the circuit topology of the system sent out from the new energy base in fig. 3, the equivalent impedance of the power supply of the power grid is changed to obtain different short-circuit ratios of the system, so that the power grids with different strengths can be obtained. The invention utilizes a control hardware-in-loop simulation platform to observe the transient reactive response characteristics of the SVG under different power grid intensities, and completes the analysis of the influence of the SVG on the power grid voltage. The specific calculation method of the short-circuit ratio is as follows:
1) calculating the short circuit capacity of the system:
firstly, calculating the equivalent impedance Z of the power supply of the power gridS：
Figure BDA0002408173770000081
Wherein Z isLFor equivalent inductive reactance of mains supply, ZRThe equivalent resistance of the power supply of the power grid.
The system short circuit capacity is Sshort：
Figure BDA0002408173770000091
Wherein S isshortFor system short circuit capacity, S1Rated capacity for the system，U1Is the system grid voltage.
2) Device short circuit capacity calculation SN：
Figure BDA0002408173770000092
Wherein S isNFor the total capacity of the system power generating unit and the compensating device, SN1、SN2......SNnFor each power generation unit and compensator capacity.
3) And (3) calculating the short circuit ratio of the system to SCR:
Figure BDA0002408173770000093
when device capacity SNIn a certain degree, Z can be changed as shown in the formula (16-17)LAnd ZRThereby changing the system short-circuit capacity SshortAnd obtaining different system short circuit ratios, and analyzing the SVG transient reactive response characteristics according to different disturbance experiments. From SshortIt can be known that the line impedance value in the simulation model of fig. 3 needs to be changed to complete different short circuit ratio experiments.
(2) SVG control hardware-in-loop simulation platform building method
Building an SVG control hardware-in-loop simulation platform, firstly, modeling a circuit topology of FIG. 2, wherein the meaning and determination method of each parameter in the graph are as follows:
1) filter reactance L selection
Considering the capacity and the voltage grade of the SVG reactive power compensation device to determine the system impedance
Figure BDA0002408173770000094
According to empirical values, the short-circuit impedance of the SVG device generally takes 10%, so the filter reactance is:
Figure BDA0002408173770000095
wherein S isNRated capacity of the device, UNRated value of AC line voltage, U in this caseNIs 35kV, omegaNIs the power frequency.
2) Power module voltage Udc
The power module and the AC line voltage conversion relationship are
Figure BDA0002408173770000101
Wherein, Um_NFor a single power module DC voltage equivalent to the effective value of the AC line voltage, Udc_nThe voltage is the nominal voltage of the direct current capacitor of a single power module, M is the modulation ratio, and M is less than 1.
3) Power module number n calculation
Considering the system redundancy requirement, assuming the redundancy coefficient is k, the number of power modules is
Figure BDA0002408173770000102
4) Equivalent switching frequency of SVG alternating current port
f＝n·fk(5)
Wherein f iskIs the power module switching frequency.
5) SVG AC port line voltage equivalent level number
2n+1 (6)
And according to the calculation result, modeling and model parameter determination are completed on the SVG circuit topology, and the model is finally downloaded to a real-time simulator to complete the hardware-in-loop simulation test.
Based on the circuit topology structure of fig. 2 and the schematic diagram of the simulation platform of fig. 1, the following table describes the interfaces between the simulator model and the SVG controller, and for different controllers and different application sites, the names, types and numbers of the interfaces are different, including the voltage and current analog quantity between the power grid and the SVG controller and the switch digital quantity in the SVG controller circuit.
Table 1 SVG control in-loop simulation platform interface table
Figure BDA0002408173770000103
Figure BDA0002408173770000111
(3) FIG. 3 is a circuit topology diagram of a new energy cluster sending-out system, in which UNFor new energy power station grid voltage, U1The voltage is ideal grid voltage of a new energy base transmitting end system, and R and jX are equivalent impedance of a system circuit. Following analysis of SVG device voltage UNAnd the voltage U of the power grid of the sending end system1And (4) relationship.
1) Calculating system line loss
Figure BDA0002408173770000112
Figure BDA0002408173770000113
Z, R, X is the equivalent impedance, the equivalent resistance and the equivalent inductive reactance of the system line S1、P1、Q1Apparent power, active power and reactive power of the grid, delta PZ、ΔQZRespectively the active power and the reactive power of the system line loss.
2) Calculating power of grid-connected point system
Figure BDA0002408173770000121
Figure BDA0002408173770000122
Wherein, PN、QNThe active power and the reactive power of a wind field, the SVG and a grid connection point are respectively.
3) Assuming that the SVG device is powered at
Figure BDA0002408173770000123
Figure BDA0002408173770000124
Wherein, PSVG、QSVGThe SVG device is respectively active power and reactive power.
4) The power sent by the new energy station is
Figure BDA0002408173770000125
Figure BDA0002408173770000126
Wherein, PFD、QFDThe active power and the reactive power of the new energy station are respectively.
5) Calculating the power of the power grid of the transmitting end system
Figure BDA0002408173770000127
Figure BDA0002408173770000128
7) Calculating grid-connected voltage of new energy station
Figure BDA0002408173770000129
Figure BDA00024081737700001210
Wherein,
Figure BDA00024081737700001211
is the grid-connected voltage of the wind power plant.
Due to the fact that
Figure BDA00024081737700001212
The above equation can be simplified to
Figure BDA00024081737700001213
P1、Q1From formula 11
P1＝PFD-PSVG-ΔPZ(14)
Q1＝QFD-QSVG-ΔQZ(15)
Under ideal power grid, U1As can be seen from equations 13, 14, and 15, the new energy power generation grid voltage is related to the power generated by the power generation unit, the compensation device, and the system line impedance.
Step 2: the real-time simulator receives test process information executed by the SVG controller based on the disturbance experiment, and sends the information to the workstation, and the method specifically comprises the following steps:
the test management workstation is a test host and realizes the functions of monitoring the test process and the like;
the simulation platform in the invention is utilized to simulate the voltage U of the power grid of the sending end system1Carrying out disturbance and analyzing new energy field station grid-connected voltage UFDInfluence is generated, so that the transient response characteristics of the SVG compensation device under different control modes such as constant reactive power control and constant voltage control are observed. General to grid voltage U1The SVG controller still works, and then the power grid voltage can be compensated beneficially by modifying a control strategy and adjusting control parameters.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims (18)

1. The utility model provides a SVG control hardware is at emulation platform of ring which characterized in that includes: the system comprises a workstation, an SVG controller and a real-time simulator;
the real-time simulator is used for simulating an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting end system of the new energy base and verifying whether the SVG controller is off-line;
the real-time simulator is respectively connected with the workstation and the SVG controller;
the workstation is used for issuing a test instruction to the real-time simulator based on the disturbance test of the power grid voltage of the sending end system; the workstation is also used for acquiring test process information executed by the SVG circuit topology model based on the test instruction through the real-time simulator to monitor the test;
wherein, the disturbance test of sending end system grid voltage includes: and (3) carrying out perturbation tests on high voltage ride through, low voltage ride through and commutation failure.
2. The simulation platform of claim 1, wherein the SVG controller comprises a master device and a valve control device; the simulation platform further comprises an optical fiber interface converter;
the real-time simulator is connected with the master control equipment of the SVG controller, and the real-time simulator is also connected with the valve control equipment of the SVG controller through an optical fiber interface converter.
3. The simulation platform of claim 2, wherein the real-time simulator comprises: the short-circuit ratio sub-module, the functional sub-module, the I/O port and the high-speed optical fiber interface;
the short-circuit ratio submodule is used for changing the equivalent impedance of the simulated power supply of the power grid to obtain different short-circuit ratios of the power system so as to obtain different power grid strengths;
the function sub-module is used for disturbing the power grid voltage of the transmitting-end system based on the simulated SVG circuit topology model and the different power grid intensities to obtain the simulated power grid system voltage/current/SVG current analog quantity and the switch digital quantity in the SVG controller;
the high-speed optical fiber interface is connected with a low-speed optical fiber interface of valve control equipment of the SVG controller through the optical fiber interface converter, and is used for receiving a pulse trigger signal sent by the SVG controller to a model in the simulator and also used for transmitting a power module capacitance voltage signal to the SVG controller by the SVG circuit topology model in the real-time simulator; and the I/O port is used for transmitting the power grid system voltage/current/SVG current analog quantity and the switch digital quantity in the SVG controller obtained by the simulation of the real-time simulator to the SVG controller through the main control equipment.
4. The emulation platform of claim 3, wherein the I/O port comprises: an SVG switch control signal DI port, an SVG switch feedback signal DO port and an analog signal AO port;
the port of the SVG switch control signal DI is connected with the corresponding port of the main control equipment of the SVG controller and is used for receiving a main circuit breaker control signal and a bypass switch control signal issued by the SVG controller;
the feedback signal DO port of the SVG switch is connected with a corresponding port of a main control device of the SVG controller and used for sending a main breaker state and a bypass switch state returned by a SVG circuit topology model in the real-time simulator to the SVG controller;
the analog signal AO port is connected with a corresponding port of a main control device of the SVG controller and used for sending 35kV line voltage signals, 35kV phase current signals, 110kV line voltage signals, 110kV phase current signals and SVG phase currents of an SVG circuit topology model in the real-time simulator to the SVG controller.
5. The simulation platform of claim 3, wherein the short circuit ratio sub-module comprises: a system short circuit capacity unit, a device short circuit capacity unit and a short circuit ratio calculation unit;
the system short-circuit capacity unit is used for calculating the system short-circuit capacity based on the equivalent inductive reactance of the power grid power supply, the equivalent resistance of the power grid power supply, the system rated capacity and the system power grid voltage;
the device short-circuit capacity unit is used for calculating the device short-circuit capacity based on the capacities of the power generation units and the compensation device;
the short circuit ratio calculation unit is used for calculating a system short circuit ratio based on the system short circuit capacity and the system short circuit capacity.
6. The emulation platform of claim 3, wherein the fiber optic interface switch comprises: the signal triggering submodule and the capacitor voltage returning submodule;
the signal triggering sub-module is used for converting the low-speed optical fiber into a high-speed optical fiber after analyzing and recompiling the low-speed optical fiber of the valve control equipment, and transmitting a pulse triggering signal of the SVG controller to the real-time simulator through the high-speed optical fiber interface;
and the capacitance voltage feedback sub-module is used for converting a power module capacitance voltage signal of the SVG circuit topology model output by a high-speed optical fiber into a low-speed optical fiber and transmitting the low-speed optical fiber signal to the SVG controller through the low-speed optical fiber interface of the valve control device.
7. The simulation platform of claim 1, further comprising, an analysis module;
and the analysis module is used for analyzing the transient reactive response characteristic of the SVG based on a disturbance test of the grid voltage of the transmitting end system performed by the real-time simulator.
8. The simulation platform of claim 7, wherein the analysis module comprises: a characteristic parameter calculation submodule;
and the characteristic parameter calculation submodule is used for calculating the line loss of a new energy base transmitting system, calculating the power of a grid-connected point system, setting the power of an SVG device, calculating the power emitted by a new energy station, calculating the power of a transmitting system grid and calculating the grid-connected voltage of the new energy station based on the voltage/current/SVG current analog quantity of a power grid system and the switch digital quantity in the SVG controller which are obtained by simulation under different power grid strengths and in a constant reactive power control or constant voltage control mode.
9. The simulation platform of claim 1, wherein the SVG circuit topology model and model parameters are determined based on selection of filter reactance, determination of a conversion relationship between power modules and ac line voltage, calculation of the number of power modules, calculation of SVG ac port equivalent switching frequency, and calculation of the number of SVG ac port line voltage equivalent levels.
10. A simulation method based on an SVG control hardware-in-the-loop simulation platform is characterized by comprising the following steps:
the real-time simulator simulates an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of a transmitting end system of the new energy base based on a test instruction issued by the workstation, and verifies whether the SVG controller is off-line;
the real-time simulator receives test process information executed by the SVG controller based on the disturbance experiment and sends the information to the workstation;
the test instruction issued by the workstation is determined by a disturbance test of the workstation based on the grid voltage of the sending end system; the disturbance test of the grid voltage of the sending end system comprises the following steps: and (3) carrying out perturbation tests on high voltage ride through, low voltage ride through and commutation failure.
11. The simulation method of claim 10, wherein the real-time simulator simulates an SVG circuit topology model and model parameters to perform a disturbance test of the grid voltage of the transmitting end system of the new energy base based on test instructions issued by the workstation, and verifies whether the SVG controller is off-line, comprising:
the real-time simulator changes the simulated equivalent impedance of the power supply of the power grid based on a test instruction issued by the workstation to obtain different short-circuit ratios of the power system so as to obtain different power grid strengths;
the simulated power grid system voltage/current/SVG current analog quantity and the switch digital quantity in the SVG controller are obtained based on the simulated SVG circuit topology model and the different power grid intensity disturbance transmitting end system power grid voltages;
and the SVG circuit topology model in the real-time simulator transmits a power module capacitance voltage signal to the SVG controller through the high-speed optical fiber interface, and receives a pulse trigger signal sent by the SVG controller to the model in the simulator through the high-speed optical fiber interface.
12. The simulation method of claim 11, wherein the real-time simulator receives test process information performed by an SVG controller based on the perturbation experiment and sends the information to the workstation, comprising:
the real-time simulator transmits the voltage/current/SVG current analog quantity of the power grid system and the switch digital quantity in the SVG controller to a main control device of the SVG controller through an SVG switch feedback signal DO port and an analog signal AO port;
the real-time simulator acquires a switch control command fed back by a main circuit breaker and a bypass switch of the SVG controller and a pulse trigger signal fed back by a valve control device of the SVG controller through the optical fiber interface converter, and sends the switch control command and the pulse trigger signal to the workstation.
13. The simulation method of claim 11, wherein the real-time simulator changes the simulated equivalent impedance of the power supply of the power grid based on the test instructions issued by the workstation to obtain different short-circuit ratios of the power system and thus different power grid strengths, and comprises:
calculating the short-circuit capacity of the system based on the equivalent inductive reactance of the power grid, the equivalent resistance of the power grid, the rated capacity of the system and the voltage of the system power grid;
calculating device short circuit capacity based on the capacity of each power generation unit and the compensation device;
a system short ratio is calculated based on the system short capacity and the system short capacity.
14. The simulation method of claim 11, wherein the transmitting a power module capacitor voltage signal to the SVG controller by the SVG circuit topology model in the real-time simulator through the high-speed optical fiber interface and receiving a pulse trigger signal issued by the SVG controller to the model in the simulator through the high-speed optical fiber interface comprises:
the optical fiber interface converter analyzes and recompiles the low-speed optical fiber of the valve control equipment, converts the low-speed optical fiber into a high-speed optical fiber, and transmits a pulse trigger signal of the SVG controller to the real-time simulator through the high-speed optical fiber interface;
and the optical fiber interface converter converts the power module capacitance voltage signal of the SVG circuit topology model output by the high-speed optical fiber into a low-speed optical fiber, and the low-speed optical fiber is transmitted to the SVG controller through the low-speed optical fiber interface of the valve control device.
15. The simulation method of claim 10, wherein the method further comprises:
and analyzing the transient reactive response characteristic of the SVG based on the disturbance test of the power grid voltage of the transmitting end system by the real-time simulator.
16. The simulation method of claim 15, wherein the analyzing SVG transient reactive response characteristics based on the disturbance test of the grid voltage of the sending-end system by the real-time simulator comprises:
and calculating the line loss of a new energy base transmitting end system, calculating the power of a grid-connected point system, setting the power of an SVG device, calculating the power of a new energy station, calculating the power of a transmitting end system and calculating the grid-connected voltage of the new energy station under the conditions of the voltage/current/SVG current analog quantity of the power grid system and the switching digital quantity in the SVG controller which are obtained by simulation under different power grid strengths and a constant reactive power control or constant voltage control mode.
17. The simulation method of claim 16, wherein the grid power of the sending-end system is calculated as follows:
Figure FDA0002408173760000051
in the formula,
Figure FDA0002408173760000052
for the grid power of the sending-end system,
Figure FDA0002408173760000053
in order to obtain the power of the point-to-point system,
Figure FDA0002408173760000054
in order to reduce the line loss of the system,
Figure FDA0002408173760000055
the power generated by the new energy station,
Figure FDA0002408173760000056
for SVG device power, PFDFor active power of new energy stations, PSVGFor SVG devices active power, QFDFor SVG devices reactive power, QFDFor reactive power, delta P, of a new energy stationZ、ΔQZActive and reactive power, P, respectively, of system line losses1、Q1Respectively the active power and the reactive power of the power grid.
18. The simulation method of claim 16, wherein the grid-connected voltage of the new energy station is calculated by the following formula:
Figure FDA0002408173760000057
in the formula,
Figure FDA0002408173760000058
is the grid-connected voltage of the new energy station,
Figure FDA0002408173760000059
for wind farm grid-connected voltage, U1For ideal grid voltage of a new energy base sending end system, R is system line resistance, X is system line reactance, and R + jX is system line equivalent impedance;
wherein, the active power P of the power grid1The expression of (a) is:
P1＝PFD-PSVG-ΔPZ
reactive power Q of power grid1The expression of (a) is:
Q1＝QFD-QSVG-ΔQZ。
CN202010168268.1A 2020-03-09 2020-03-09 SVG control hardware-in-loop simulation platform and simulation method Pending CN111459048A (en)

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