CN103439967A - Closed loop test system of flexible direct current transmission control protection system - Google Patents
Closed loop test system of flexible direct current transmission control protection system Download PDFInfo
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Abstract
The invention discloses a closed loop test system of a flexible direct current transmission control protection system. The closed loop test system of the flexible direct current transmission control protection system comprises a real-time digital simulator and a control protection device of a flexible direct current transmission device based on modularized multi-level, wherein the alternating voltage and current signal output end of the real-time digital simulator is connected with the alternating analog quantity input end of the control protection device, the direct voltage and current signal output end of the real-time digital simulator is connected with the direct analog quantity input end of the control protection device, the switching state signal output end of the real-time digital simulator is connected with the switching value input end of the control protection device, and the switching merge-joint command signal output end of the control protection device is connected with the switching value input end of the real-time digital simulator. The closed loop test system of the flexible direct current transmission control protection system has the advantages of being simple, flexible, and capable of conveniently and rapidly achieving tests on a whole flexible direct current transmission actual control protection system device based on the modularized multi-level.
Description
Technical field
The invention belongs to electric and electronic technical field, particularly a kind of flexible DC power transmission based on modular multilevel is controlled the closed loop test system of protection system.
Background technology
Along with the progress of power electronic devices and control technology, flexible direct current capacity and electric pressure are more and more higher.Flexible DC power transmission based on modular multilevel is easy to realize the plurality of advantages such as new-energy grid-connected, black startup, power reverses, structure MTDC transmission system because of it, and more and more is used widely.
Flexible DC power transmission device based on modular multilevel needs the simulated field situation to make closed test in research and development and functional test stage, stable state and dynamic property with adjustment with the access control system.The method that closed test is commonly used builds the physics prototype; the method that builds the physics prototype is dwindled the primary system equipment such as converter valve according to certain capacity ratio; and be built into the dynamic analog test system of low capacity according to real topology, and form closed-loop system by interfacing equipment and working control protection equipment connection and complete various dynamic tests.
The test that flexible DC power transmission based on modular multilevel is controlled the protection system device has following characteristics:
(1) the flexible DC power transmission device based on modular multilevel is according to the parameter of the primary equipments such as the independent calculating of the actual conditions at each station and design converter valve, and device parameter and the converter valve submodule number of the flexible DC power transmission device of every cover based on modular multilevel are all not identical;
(2) the flexible DC power transmission mounted cast based on modular multilevel is comparatively complicated, and along with the rising of capacity, the submodule number more and more comes, and causes building the moving die system cost more and more higher;
(3) flexible DC power transmission based on modular multilevel and new forms of energy (for example wind-powered electricity generation access) access for multiterminal of the flexible DC power transmission based on modular multilevel, almost can't realize by building the complete simulation whole system test of prototype.
Due to above reason; the control protection system of the flexible DC power transmission based on modular multilevel is carried out to function to employing dynamic model method of testing and dynamic performance testing seems very uneconomical; and the construction period of change dynamic model equipment and parameter is longer, whole flexible direct current system is carried out to complete simulation and often can not realize.At present; to based on the modular multilevel flexible DC power transmission, controlling protection, tested; the main off-line simulation that relies on is simulated; but the dispatching system of off-line simulation, performance period, operational factor etc. can not prepare to simulate working control protection equipment; can not accurately simulate stable state and the dynamic property of controlling protection system, well Guiding Practice.At present, based on modular multilevel flexible DC power transmission working control protective device, test mode is not preferably also arranged.Development along with digital processing technology, digital signal technique and parallel computing etc.; utilize real-time simulation device; with control protection equipment based on the modular multilevel flexible DC power transmission and form closed loop test system, make to working control protection equipment carry out stable state and dynamic property test become a kind of possible.This case is based on this kind of consideration and produces.
Summary of the invention
Purpose of the present invention; be to provide a kind of flexible DC power transmission to control the closed loop test system of protection system; it has the characteristics of simple and flexible, can realize quickly and easily the test to the whole flexible DC power transmission working control protection system device based on modular multilevel.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of flexible DC power transmission is controlled the closed loop test system of protection system, the control protection equipment that comprises Real Time Digital Simulator and the flexible DC power transmission device based on modular multilevel, the alternating voltage of described Real Time Digital Simulator and current signal output end adopt the small voltage signal directly to be connected with the ac analog input end of controlling protection equipment, and the DC voltage of Real Time Digital Simulator and current signal output end are connected with the DC analogue quantity input end of control protection equipment; The switch state signal output terminal of Real Time Digital Simulator connects the switching value input end of controlling protection equipment and connects, and controls the switching value input end of the switch deciliter command signal output terminal connection Real Time Digital Simulator of protection equipment; The flexible direct current converter valve submodule capacitance voltage based on modular multilevel of Real Time Digital Simulator simulation output is connected with each submodule input end of the converter valve opertaing device of controlling protection equipment with the submodule malfunction, and the valve control system pulse signal of control protection equipment is connected with the pulse input end of Real Time Digital Simulator.
Above-mentioned Real Time Digital Simulator adopts RTDS or RT-LAB real-time simulation apparatus.
After adopting such scheme; the present invention builds flexible DC power transmission by real-time simulation device and controls the protection system closed loop test system; power electronic equipment before changing is given to the monotechnics means of physical verification by building prototype; overcome that physical prototype machine proving period is long, cost is high and lack the shortcoming of dirigibility, for comparatively comprehensively verification experimental verification is provided based on turn-off device power electronics control protective unit.Enforcement of the present invention will realize form comparatively complete closed loop test checking based on the modular multilevel flexible DC power transmission, thereby shorten exploitation, the design and establishing cycle of engineering, minimizing engineering cost.The closed loop test system of controlling protection system based on the modular multilevel flexible DC power transmission consists of Real Time Digital Simulator and control protection equipment.By selecting suitable digital model element, according to the Practical Project topological structure and input corresponding parameter and can be built into the digital model that is applicable to specific requirement of engineering, the digital model that each power equipment is corresponding is connected according to real topology, has just formed the primary system model program.After utilizing the supporting composing software of digital simulator that model program is compiled, download in the processor board of digital simulator and carry out computing.The hardware components of digital simulator has also comprised the interface board usually.The interface board is connected with the processor board by cable or optical fiber on one side, and another side is connected with control protection equipment by cable, completes the interface of digital simulator and working control protection equipment.
The present invention is owing to adopting Real Time Digital Simulator and the flexible DC power transmission based on modular multilevel to control the structure of protection structure closed-loop system, can revise easily and quickly parameter and the topological structure of primary equipment, meet the test demand of the different flexible DC power transmission engineerings based on modular multilevel; The flexible DC power transmission of simultaneously building based on modular multilevel by real-time simulator is controlled protection system closed-loop system pilot system, can realize that large-scale and the flexible DC power transmission system of multiterminal based on modular multilevel are controlled to protection system is tested.
The accompanying drawing explanation
Fig. 1 is based on the topological structure schematic diagram (take the flexible DC power transmission system of two ends based on modular multilevel as the example explanation) of the relevant primary system of flexible DC power transmission of modular multilevel;
Fig. 2 is based on modularization multi-level converter topological structure and submodule topological structure;
Fig. 3 is based on the schematic diagram that the relevant primary system digital module of flexible DC power transmission of modular multilevel is built;
Fig. 4 is the structural representation of real-time digital closed loop test system of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
As shown in Figure 4; the invention provides a kind of flexible DC power transmission and control the closed loop test system of protection system; the control protection equipment that comprises Real Time Digital Simulator and the flexible DC power transmission device based on modular multilevel; the control protection equipment connection of described Real Time Digital Simulator and the flexible DC power transmission device based on modular multilevel, form closed loop test system.
The alternating voltage of described Real Time Digital Simulator and current signal output end adopt the small voltage signal directly to be connected with the ac analog input end of controlling protection equipment, and the DC voltage of Real Time Digital Simulator and current signal output end are connected with the DC analogue quantity input end of control protection equipment; The switch state signal output terminal of Real Time Digital Simulator connects the switching value input end of controlling protection equipment and connects, and controls the switching value input end of the switch deciliter command signal output terminal connection Real Time Digital Simulator of protection equipment; The flexible direct current converter valve submodule capacitance voltage based on modular multilevel of Real Time Digital Simulator simulation output is connected with each submodule input end of the converter valve opertaing device of controlling protection equipment with the submodule malfunction, and the valve control system pulse signal of control protection equipment is connected with the pulse input end of Real Time Digital Simulator.
In the present embodiment, Real Time Digital Simulator adopts RTDS or RT-LAB real-time simulation apparatus.
The present invention, when implementing, comprises the steps:
1), according to primary system equipment topology and parameter and the AC system parameter of the flexible DC power transmission device based on modular multilevel, set up the relevant primary system digital simulation model of flexible DC power transmission based on modular multilevel;
2) utilize the supporting modeling software of Real Time Digital Simulator, set up the numerical experiment program of the relevant primary system digital simulation model of flexible DC power transmission based on modular multilevel;
3) utilize the supporting program compilation software of Real Time Digital Simulator by the numerical experiment program compilation, and download on Real Time Digital Simulator and move;
4) alternating voltage and deciliter order of electric current, DC voltage and electric current, on off state and switch of Real Time Digital Simulator simulation realize that by cable real-timedigital simulation equipment is connected with the working control protection system; the converter valve internal simulation amount output of Real Time Digital Simulator simulation, fault output and pulse input are connected with working control protection equipment by cable or optical cable; build the closed-loop simulation system, thereby realize function and the dynamic property of the control of the flexible DC power transmission based on modular multilevel protection system are carried out to DCO.
The relevant primary system major equipment of flexible DC power transmission that the present invention is based on modular multilevel comprises wind power plant, the valve systems such as interchange, generator, converter power transformer, flexible DC power transmission converter valve based on modular multilevel, alternating current circuit and DC line, also comprise in addition the isolating switch of AC and DC side, isolation switch, grounding switch, its two ends topological structure as shown in Figure 1, wherein comprised some voltage, the measuring amount of electric current: converter valve becomes AC system side bus electric current and voltage, converter valve side electric current and voltage, each brachium pontis electric current, DC voltage and current etc.
The digital simulation model of the relevant primary system of the flexible direct current that the present invention builds according to the parameter of topological structure and primary equipment as shown in Figure 1, according to current conversion station AC topological structure and the mode of connection, as shown in Figure 1 with station 1 wind energy turbine set be connected, transformer T1, alternating-current switch Q1, transformer T2 etc., build at the supporting modeling software of digital simulator and build the AC system realistic model according to topological structure and parameter; According to valve reactor, converter valve topological structure, its concrete topological structure as shown in Figure 2, capacitance, half control type device etc. form the parameter of the equipment such as brachium pontis reactor and converter valve, at the supporting modeling software of Digital Simulation, by model element, build converter valve and brachium pontis reactance realistic model; According to actual parameters such as the mode of connection of current conversion station DC side circuit, cable type, length of cable, height, at the supporting modeling software of Digital Simulation, by model element, build the DC line model.According to real topology, above-mentioned each digital model is interconnected, complete the relevant primary system digital model of flexible DC power transmission based on modular multilevel.Its model buildings schematic diagram as shown in Figure 3.
As shown in Figure 4, the analog quantity board that the change of current that in Real Time Digital Simulator, the relevant primary system digital model computing of flexible direct current obtains becomes system side alternating voltage, converter transformer valve side alternating voltage, electric current process Real Time Digital Simulator directly is sent to the protection equipment of controlling to the embodiment of interface of the present invention; The analog output card of the voltage and current signals such as converter valve DC voltage, electric current, brachium pontis electric current process Real Time Digital Simulator directly is sent to the DC analogue quantity input card of controlling protection equipment and is sampled; The on off states such as location status of AC isolating switch and DC side disconnector directly are sent to by the digital output module of emulator the switching value input card of controlling protection equipment, control protection equipment the switch deciliter order of AC isolating switch and direct current strategy isolation switch etc. directly is sent to the switching value input card of real-time simulator by the digital output module of controlling protection equipment; Flexible DC power transmission converter valve submodule capacitance voltage and the submodule malfunction based on modular multilevel of Real Time Digital Simulator simulation output are passed through protocol mode; for example AURORA agreement or gigabit Ethernet agreement directly are connected with the valve control system of controlling protection equipment; control protection equipment valve control system after a series of computings; start pulse signal directly is connected with real-timedigital simulation equipment by protocol mode, completes the accurate control that converter valve in digital simulation model is triggered.
By the way, the flexible DC power transmission working control protection based on modular multilevel has realized the accurate control to the real-timedigital simulation model, completes controlling functional test and the dynamic performance testing of protection equipment.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention, and any change of doing on the technical scheme basis, within all falling into protection domain of the present invention.
Claims (2)
1. a flexible DC power transmission is controlled the closed loop test system of protection system, it is characterized in that: the control protection equipment that comprises Real Time Digital Simulator and the flexible DC power transmission device based on modular multilevel, the alternating voltage of described Real Time Digital Simulator and current signal output end adopt the small voltage signal directly to be connected with the ac analog input end of controlling protection equipment, and the DC voltage of Real Time Digital Simulator and current signal output end are connected with the DC analogue quantity input end of control protection equipment; The switch state signal output terminal of Real Time Digital Simulator connects the switching value input end of controlling protection equipment and connects, and controls the switching value input end of the switch deciliter command signal output terminal connection Real Time Digital Simulator of protection equipment; The flexible direct current converter valve submodule capacitance voltage based on modular multilevel of Real Time Digital Simulator simulation output is connected with each submodule input end of the converter valve opertaing device of controlling protection equipment with the submodule malfunction, and the valve control system pulse signal of control protection equipment is connected with the pulse input end of Real Time Digital Simulator.
2. a kind of flexible DC power transmission as claimed in claim 1 is controlled the closed loop test system of protection system, it is characterized in that: described Real Time Digital Simulator adopts RTDS or RT-LAB real-time simulation apparatus.
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| CN104914734A (en) * | 2015-04-21 | 2015-09-16 | 中国南方电网有限责任公司电网技术研究中心 | Mixed DC closed-loop test system and implementation method |
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