The experimental system of MMC flexible direct-current transmission of electricity Control protection equipment and method
Technical field
The invention belongs to modular multi-level flexible direct-current transmission field, particularly a kind of experimental system of modular multi-level flexible direct-current transmission Control protection equipment and experimental technique.
Background technology
Flexible DC power transmission is a kind of IGBT(Insulated of employing Gate Bipolar Transistor) entirely control device formation voltage-source type converter valve, carry out the mode of direct current transportation transmission, modular multilevel (MMC, Multi-level modular Converter) namely the converter valve that forms of mode be wherein a kind of, can see J.DORH, H.HUANG, D.RETZMANN.A new Multilevel Voltage-sourced converterTopology for HVDC Applications [C], Cigre Symposium Paris2008, France.Being the topological diagram of modularization multi-level converter as shown in Figure 1, is the complete structure of three-phase six brachium pontis in figure, and in figure, each brachium pontis is composed in series by multiple half-bridge submodule.
Modular multi-level flexible direct-current transmission Control protection equipment and valve base control electronic equipment, the equipment that modularization multi-level converter is controlled, the object controlled is the service requirement meeting flexible direct current transmission converter station, these require to include the adjustment to conveying DC power size, the voltage at electrical network place is connected to modularization multi-level converter and reactive power regulates, and the operation of a satisfied definite sequence is carried out to switch tool in station;
Modular multi-level flexible direct-current transmission Control protection equipment and valve base control electronic equipment; simulated field situation is needed to carry out control performance test; defencive function is tested; and the policy validation experiment of submodule; adjust the dynamic property of Control protection system whereby; Protection parameters is arranged, defencive function, and simultaneous verification and improvement valve base control electronic equipment submodule Preservation tactics.The method of common simulated experiment is reduced according to certain capacity ratio by the primary system equipment such as converter valve, the dynamic simulation experiment system of low capacity is built into according to real topology, and form closed-loop system with the Control protection equipment of reality and complete various dynamic experiment, such as at number of patent application 201110171890.9, application publication number is CN102313850A, autograph is: in a kind of physical real-time dynamic simulation device literary composition of flexible direct current power transmission system, mention a kind of modular multi-level flexible direct-current transmission Control protection equipment experimental system and experimental technique, be exactly carry out the experimental system that physical model builds in this manner, the shortcoming of this mode needs to build to comprise transformer, reactor, and the Scaling physical model of the primary equipment such as submodule, not only take up room, and affect experimental performance when variation in plant parameters, change parameter difficulty.
On the other hand, the Modularized multi-level converter sub-module board being multiple Scaling due to each brachium pontis is composed in series, and each submodule board includes communication interface, controls electronic equipment be connected complexity with valve base, when submodule quantity increases, be difficult to expand on original basis.
At document " Liu Tao, Guo Chunyi, Zhao Chengyong, horse Yulong, the modeling of modularization multi-level converter main circuit in RTDS, Chinese Higher school Power System and its Automation specialty the 26 Annual Conference and the annual meeting in 2010 of electric system Professional Committee of CSEE " in mention and utilize real-time simulation platform RTDS constructing modular multilevel converter main circuit model, and utilize small step long transmission line model to expand the emulation capacity of modularization multi-level converter in RTDS, and after have employed small step long transmission line model, verification experimental verification has been carried out on the impact of modularization multi-level converter operation characteristic.This is the off-line simulation ability utilizing RTDS, studies the emulation capacity of RTDS itself.
At document " L A Gregoire, W Li, J Belanger, L Snider, Validationof a60-level modular multilevel converter model-overview of offline andreal-time HIL testing and results.International conference on powersystems Transients (IPST2011) Delft, the Netherlands June14-17, 2011 " mention in and transverter model and controller be put into respectively two independently in Real Time Digital Simulator, this is a kind of test to analogue system itself and mathematical model, but lack important step valve base and control electronic equipment, the submodule Preservation tactics that valve base controls electronic equipment cannot be verified, on the other hand, do not adopt actual Control protection equipment, also complete test cannot be done to the control characteristic of the Control protection equipment of reality and protective capability.
Current modular multi-level flexible direct-current transmission Control protection equipment experiment has following characteristics:
(1) quantity in different engineerings of the submodule quantity in primary system topology is different, and varying number submodule will bring output voltage, and the characteristic of electric current is different, needs Control protection equipment according to circumstances to adjust control program parameter, meets control characteristic requirement;
(2) control strategy of Control protection equipment needs frequently to adjust according to field requirement, needs to carry out short time test at the scene and will drop into on-the-spot operation after adjustment, after sometimes even there is adjustable strategies, because condition limits the situation being difficult to verify;
(3) Preservation tactics relating to submodule in valve base control electronic equipment is difficult to verify at the scene;
(4) parameter of primary system topology can adjust for different engineerings.
Summary of the invention
Object of the present invention; be experimental system and method that a kind of MMC flexible direct-current transmission of electricity Control protection equipment is provided; it can carry out closed loop test to the control performance of modular multi-level flexible direct-current transmission Control protection equipment, relaying configuration and function; functional test can be done to valve control equipment simultaneously; system topological change or primary system parameter modification time, can conveniently by amendment realistic model reach test purpose.
In order to reach above-mentioned purpose, solution of the present invention is:
An experimental system for MMC flexible direct-current transmission of electricity Control protection equipment, comprises Real Time Digital Simulator, the valve base control electronic equipment of modularization multi-level converter and the Control protection equipment of modularization multi-level converter; Wherein, Real Time Digital Simulator and valve base are controlled electronic equipment and are connected by optical fiber; Real Time Digital Simulator is connected by optical fiber or cable with Control protection equipment; Control protection equipment and valve base control to be connected by optical fiber or cable between electronic equipment, form valve base and control electronic equipment and Control protection performance closed loop test system.
The digitized communication that above-mentioned Real Time Digital Simulator and valve base control electronic equipment adopts optical-fibre communications mode, and interface bandwidth speed is 1000M or 1G-10G; Adopt agreement be Aurora agreement or 1000M/(1G-10G) Ethernet protocol; Interface hardware part adopts supports the FPGA board of Aurora agreement, the board of gigabit Ethernet agreement or described protocol conversion hardware device therebetween.
What above-mentioned Real Time Digital Simulator and valve base controlled that the digitized communication of electronic equipment adopts is receipts two optical fiber, and transferring content contains all valve bases that relates to and controls electronic equipment and control the pulse of brachium pontis submodule and simulation, on-off model.
Above-mentioned modularization multi-level converter comprises six brachium pontis, between two a brachium pontis one group facies unit in series; Described experimental system also comprises six deck valve bases and controls electronic equipment, and Real Time Digital Simulator and valve base control to be connected 12 optical fiber between electronic equipment.
The alternating voltage of above-mentioned Real Time Digital Simulator, alternating current, DC voltage are directly connected with actual Control protection equipment with the signal output port of DC current; the output switch parameter port of Real Time Digital Simulator is directly connected with working control proterctive equipment, and the output switch parameter end of Control protection equipment is directly connected with the On-off signal end of Real Time Digital Simulator.
Above-mentioned Real Time Digital Simulator adopts RTDS or RTLAB based on FPGA hardware.
A kind of experimental technique of the experimental system based on aforesaid MMC flexible direct-current transmission of electricity Control protection equipment; primary system model is built at the interface that Real Time Digital Simulator provides; this model adopts Practical Project parameter; comprise power supply, transformer, reactor and brachium pontis submodule model; to relating to modular multi-level flexible direct-current transmission system topological structure or parameter variations; the interface provided at Real Time Digital Simulator is directly revised; revise complete preservation, compiling forms loading of executed file to Digital Simulation System real time execution.
Above-mentioned experimental technique also comprises: valve base controls electronic equipment and is configured according to multi-level inverter bridge arm submodule quantity and separate unit valve base control electronic equipment CPU processing power.
Above-mentioned experimental technique also comprises: when verifying that each brachium pontis adopts two deck valve bases to control the ability of electronic equipment; Real Time Digital Simulator interface board and valve base control number of electronic devices and match; every deck valve base controls electronic equipment and is connected with Real Time Digital Simulator respectively; amendment Real Time Digital Simulator is relevant to be arranged; amendment valve base controls electronic equipment and emulator interface and control strategy program, simultaneously in Control protection equipment amendment with connect valve base and control the relevant program of electronic equipment interfaces part.
After adopting such scheme, the present invention is applicable to the test of modular multi-level flexible direct-current transmission Control protection equipment performance, and checking valve base controls experimental system and the method for testing of electronic equipment strategy; Can verify closed-loop control effect, step response time, transient state transient process simplation verification, control strategy is verified, relaying configuration validation test, and defencive function is tested, and also comprises the throwing of valve control equipment submodule and moves back strategy, submodule voltage balancing control policy validation.System topological change or primary system parameter modification time, can conveniently by amendment realistic model reach test purpose; Owing to comprising the information of a lot of quantity submodule of brachium pontis in simple optical fiber, so do not need to connect a large amount of optical fiber between submodule model and valve control equipment, it is convenient to build.
Accompanying drawing explanation
Fig. 1 is major equipment and the topological structure schematic diagram of modularization multi-level converter flexible DC power transmission primary system;
Fig. 2 is the structural drawing of experimental system of the present invention.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme of the present invention is described in detail.
As shown in Figure 2, the invention provides the experimental system of a kind of MMC flexible direct-current transmission of electricity Control protection equipment, comprise Real Time Digital Simulator, the valve base of modularization multi-level converter controls the Control protection equipment of electronic equipment and modularization multi-level converter, wherein, Real Time Digital Simulator and valve base are controlled electronic equipment and are connected by optical fiber, and Real Time Digital Simulator and Control protection equipment are connected by optical fiber or cable, described Control protection equipment and valve base control to be connected by optical fiber or cable between electronic equipment, the performance test closed loop test system of formation control proterctive equipment.
Valve base controls electronic equipment and controls the configuration of electronic equipment CPU processing power according to multi-level inverter bridge arm submodule quantity and separate unit valve base, common mode is that each brachium pontis configures one, six altogether, wherein every deck valve base controls electronic equipment and all receives two Fiber connection with Real Time Digital Simulator by one.Group module number expands further, and need to increase to each brachium pontis and be equipped with two deck valve bases when controlling electronic equipment, only need increase corresponding interface board at Real Time Digital Simulator, mode is constant.
The signal output port of the alternating voltage of Real Time Digital Simulator, alternating current, DC voltage, DC current is directly connected with the Control protection equipment of reality; the output switch parameter of Real Time Digital Simulator is directly connected with working control proterctive equipment; Control protection facility switching amount output terminal is directly connected with Real Time Digital Simulator On-off signal end, forms closed loop test system.It is ± 5V that Real Time Digital Simulator exports, or ± 10V voltage signal, adopts corresponding interface board to carry out cable connection to these signals by Control protection equipment.
In present embodiment, Real Time Digital Simulator is RTDS or RTLAB, based on FPGA hardware.
In the present embodiment, Real Time Digital Simulator and valve base control the digital interface part of electronic equipment, this interface is optical fiber solutions, the interface of speed between bandwidth 1000M or 1G-10G is provided, the selection of this speed be according to the size of module number in primary system topology and and valve base control interactive information between electronic equipment and how much select.When the submodule quantity of each brachium pontis is within the scope of 1-300, electronic equipment is controlled with six deck valve bases, be connected with Real Time Digital Simulator respectively, what adopt is the optical fiber interface of gigabit bandwidth, the agreement adopted is Aurora agreement, and six deck valve bases control the board that the optical fiber interface being exclusively used in Aurora agreement all installed respectively by electronic equipment, and transmission medium is receipts two root multimode fibers, 12 optical fiber, are connected to RTDS or RTLAB equipment altogether.
For verifying that each brachium pontis adopts two deck valve bases to control the ability of electronic equipment; when concrete enforcement; actual can be split as each brachium pontis adopt two deck valve bases control electronic equipments; connected mode is the same; increase Real Time Digital Simulator interface board; amendment emulator is relevant to be arranged, simultaneously in Control protection equipment amendment be connected valve base and control electronic equipment interfaces subprogram.
When the submodule quantity of each brachium pontis is within the scope of 300-1000, control electronic equipment with 12 deck valve bases, be connected with Real Time Digital Simulator respectively, connected mode is the same.
Control between electronic equipment and Real Time Digital Simulator at valve base, the agreement of employing can be the Ethernet protocol of Aurora agreement or gigabit or 1G-10G; Interface hardware part adopts the FPGA board or gigabit of supporting Aurora agreement, and the board of 1G-10G Ethernet protocol, or the protocol conversion hardware device between two kinds of agreements.
The signal that valve base control electronic equipment is handed down to Real Time Digital Simulator comprises the pulse and bypass commands that control brachium pontis submodule, receive the capacitance voltage analog quantity of each submodule that Real Time Digital Simulator is uploaded, and the whether malfunction of each submodule, control electronic equipment by valve base and determine to throw the strategy moving back submodule according to current sub-block state quality.
The alternating voltage of Real Time Digital Simulator and electric current; DC voltage, current output signal are directly connected with actual Control protection equipment; the output switch parameter of Real Time Digital Simulator is directly connected with working control proterctive equipment, and Control protection facility switching amount output terminal is directly connected with Real Time Digital Simulator On-off signal end.It is ± 5V that Real Time Digital Simulator exports, or ± 10V voltage signal, adopts corresponding interface board to carry out cable connection to these signals by Control protection equipment.
The experimental technique that the present invention also provides a kind of MMC flexible direct-current to transmit electricity Control protection equipment, primary system model is built at the interface that Real Time Digital Simulator provides, this model adopts Practical Project parameter, comprise power supply, transformer, reactor and brachium pontis submodule model, to relating to modular multi-level flexible direct-current transmission system topological structure or parameter variations, such as brachium pontis submodule number change, time brachium pontis reactor parameter and transformer parameter are changed, the interface provided at Real Time Digital Simulator is directly revised, revise complete preservation, compiling forms loading of executed file to Digital Simulation System real time execution.
Described experimental technique also comprises; when verifying that each brachium pontis adopts two deck valve bases to control the ability of electronic equipment; Real Time Digital Simulator interface board and valve base control number of electronic devices and match; every deck valve base controls electronic equipment and is connected with Real Time Digital Simulator respectively; amendment Real Time Digital Simulator is relevant to be arranged; amendment valve base controls electronic equipment and emulator interface and control strategy program, simultaneously in Control protection equipment amendment with connect valve base and control the relevant program of electronic equipment interfaces part.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.