CN101867197B - Light direct current supply experiment system of offshore grid-connected wind farm - Google Patents
Light direct current supply experiment system of offshore grid-connected wind farm Download PDFInfo
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- CN101867197B CN101867197B CN2010102259760A CN201010225976A CN101867197B CN 101867197 B CN101867197 B CN 101867197B CN 2010102259760 A CN2010102259760 A CN 2010102259760A CN 201010225976 A CN201010225976 A CN 201010225976A CN 101867197 B CN101867197 B CN 101867197B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention relates to a light direct current (DC) supply experiment system of a offshore grid-connected wind farm in the electromechanical technical field. The system comprises two wind farm devices, five transformers, five switch control devices, an industrial personal computer, five high-pass filtering devices, five direct current contactors and five converters, wherein each switch control device contains an alternate current (AC) contactor, a thyristor of which gate can be turn off and an earth resistor; and each converter contains a level fully-controlled bridge unit, an AC capacitor, a converter reactor, a drive unit, a detection unit, a protection unit and a control unit. Various main application fields of light DC power supply can be simulated by switching the contactor of the system, and the system has universality so as to avoid repeated development caused by the change of the actual application occasion. A DSP processor is used as the control core, thus the processing speed is fast; the industrial personal computer is used as the upper computer which can realize data record and analysis and friendly man-machine interface; and the element with small capacity is adopted, which has small volume and lower cost, and is convenient to install and use.
Description
Technical field
What the present invention relates to is the system in a kind of mechanical & electrical technology field, specifically is a kind of light direct current supply experiment system of offshore grid-connected wind farm.
Background technology
The HVDC Light technology is based on VSC (voltage source converter) technology and GTO (gate level turn-off thyristor) or IGBT full-control type power devices such as (igbts); With traditional direct current transportation compared with techniques; Have the following advantages: 1) the VSC electric current can be from turn-offing; Can be operated in the passive inverter mode; Need not add commutation voltage, thereby having overcome that traditional direct current transportation held must be the essential defect of active network, makes and utilizes the direct current transportation technology to send electricity to become possibility for remote island load.VSC can independently control meritorious and reactive power when 2) normally moving, and control more flexiblely, and the controlled quentity controlled variable of traditional direct current transportation has only trigger angle, can not control independently and gain merit and reactive power.3) VSC does not need AC side that reactive power is provided, and when electrical network broke down, system can provide active power to the fault zone, simultaneously, the reactive power support can also be provided, thereby has improved the voltage and the angle stability property of system.4) VSC adopts the pulse-width modulation PWM control technology usually, and switching frequency is higher, just can obtain smooth current waveform and required alternating voltage through parallelly connected high pass filter, need not dispose special converter transformer, and the capacity of required filter also reduces greatly.
To extensive offshore grid-connected wind farm HVDC Light system; Usually adopt a big capacity current transformer respectively in wind energy turbine set side and grid side; Be connected with the direct current transportation cable, realize the offshore wind farm transmission and be incorporated into the power networks, finally insert electrical network through over commutation and two links of inversion respectively.Can take directly to give passive load for small-sized wind energy turbine set, like offshore drilling platform, isolated island terminal use etc. with the power delivery after the inversion.If the wind energy turbine set and the electrical network of a plurality of diverse geographic locations is interconnected, then need be through multiterminal direct current transportation technology, at this moment, the control mode of employing is more flexible, and can make current transformer operate in rectification state or inverter mode according to system's actual motion needs.
With respect to various connected modes, the control method that is adopted also has nothing in common with each other.Be incorporated into the power networks, take an end for deciding direct voltage, the other end for deciding the control method of active power usually, reactive power is by the independent respectively control of two ends current transformer; To the passive load power supply, the general employing decided frequency or decided alternating voltage amplitude control mode.The multi-terminal system interconnection, the control mode of employing is comparatively flexible, can switch various control modes according to actual condition.Current transformer adopts two closed-loop vector control modes usually, ring and outer shroud in being divided into, and wherein, interior ring is current closed-loop feedforward decoupling zero control, active current, reactive current are followed the tracks of the outer shroud set-point respectively; Outer shroud is then according to the control mode that is adopted, by the pi regulator control system, and the tracing preset value.
Retrieval through to the prior art document is found; The Development and Research of HVDC Light System Based on DSP (based on the HVDC Light research and development of DSP) that people such as Yanping Gao deliver in Second International Workshop on Knowledge Discovery and Data Mining academic conference has designed a kind of HVDC Light pilot system based on the IPM module; This system utilizes the DSP2812 digital signal processor; Testing circuit, circuits for triggering and control method are integrated in one, can realize basic controlling two level fully controlled bridges.But also there is following shortcoming in this scheme for actual product checking and test: 1) only be directed against single controlled target and system design in the design of experimental rig; Lack versatility; Can not accomplish test to actual product each item performance; Do not have data acquisition interface, be unfavorable for the collection and the analysis of test data; 2) do not reserve communication interface, can not communicate by letter, be not easy to the condition monitoring of the operation and the physical device operation of real system with host computer; 3) only considered the converter topologies of two level fully controlled bridges, big capacity topological structure can't be connected with its controller; 4) only consider single-ended direct current transportation, can't satisfy the requirement of multiterminal DC transmission system, isolated island power supply; 5) can't simulate realization for electrical network transient response process.To sum up, the experimental system design scheme of this article lacks versatility, can not verify and performance test various direct current transportation modes, and controller is not reserved triggering and the control interface that connects other current transformers.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of light direct current supply experiment system of offshore grid-connected wind farm is provided.The present invention is a core controller with the DSP28335 digital signal processor, adopts industrial computer as system's host computer, coordinates the operation of each converter control system, go forward side by side line data collection and system performance analysis.Simulate actual wind energy turbine set with the wind energy turbine set device; With the load simulation passive system; After transformer isolation, connect and compose a five terminal DC transmission system with electrical network; And change system configuration through contactor is set at each corresponding end points, like structures such as single-ended, multiterminal, the control method of checking transmission system.
The present invention realizes through following technical scheme:
The present invention includes: two wind energy turbine set devices, five transformers, five switch controlling devices, industrial computer, five high pass filtering devices, five D.C. contactors and five convertor assemblys, wherein: the first wind energy turbine set device electric energy transmitting that links to each other with first transformer, the second wind energy turbine set device electric energy transmitting that links to each other with second transformer; First transformer electric energy of transmission after the transformation that link to each other with first switch controlling device, second transformer link to each other with the second switch control device and transmit the electric energy after the transformation, first switch controlling device control information transmission that links to each other with first convertor assembly; The second switch control device control information transmission that links to each other with second convertor assembly, first convertor assembly links to each other with second convertor assembly, and second convertor assembly links to each other with the 3rd convertor assembly; The 3rd convertor assembly links to each other with the 4th convertor assembly; The 4th convertor assembly links to each other with the 5th convertor assembly, and the 5th convertor assembly links to each other with first convertor assembly, and an end of first D.C. contactor links to each other with first convertor assembly; The other end of first D.C. contactor links to each other with the 3rd convertor assembly; One end of second D.C. contactor links to each other with second convertor assembly, and the other end of second D.C. contactor links to each other with the 4th convertor assembly, and an end of the 3rd D.C. contactor links to each other with the 3rd convertor assembly; The other end of the 3rd D.C. contactor links to each other with the 5th convertor assembly; One end of the 4th D.C. contactor links to each other with the 4th convertor assembly, and the other end of the 4th D.C. contactor links to each other with first convertor assembly, and an end of the 5th D.C. contactor links to each other with the 5th convertor assembly; The other end of the 5th D.C. contactor links to each other with first convertor assembly; The 3rd convertor assembly links to each other with the 3rd switch controlling device, and the 3rd switch controlling device links to each other with the 3rd transformer, and the 4th convertor assembly links to each other with the 4th switch controlling device; The 4th switch controlling device links to each other with the 4th transformer; The 5th convertor assembly links to each other with the 5th switch controlling device, and the 5th switch controlling device links to each other with the 5th transformer, the 3rd transformer electric energy transmitting that links to each other with first electrical network; The 4th transformer electric energy transmitting that links to each other with second electrical network; The 5th transformer electric energy transmitting that links to each other with passive network, the secondary side of each transformer connects a high pass filtering device respectively, the other end ground connection of high pass filtering device.
Described wind energy turbine set device comprises: generator and generating speed regulator, wherein: the input electric energy transmitting that links to each other with electrical network of generating speed regulator, the speed regulator that generates electricity links to each other with generator and transmits the electric energy of speed governing, the generator electric energy transmitting that links to each other with transformer.
Described switch controlling device comprises: A.C. contactor, gate level turn-off thyristor and earth resistance; Wherein: a common end after an end of A.C. contactor links to each other with an end of gate level turn-off thyristor as switch controlling device; One end of earth resistance links to each other with the other end of gate level turn-off thyristor; The other end ground connection of earth resistance, the other end of A.C. contactor is as the other end of switch controlling device.
Described industrial computer is provided with data collecting card.
Described high pass filtering device is used for the high order harmonic component around filtering PWM (pulse width modulation) switching frequency; Comprise: star-like electric capacity of three-phase and inductance; Wherein: an end of inductance links to each other with the secondary side of transformer, and the other end of inductance links to each other with the star-like electric capacity of three-phase, the star-like capacity earth of three-phase.
Described convertor assembly comprises: level fully controlled bridge unit, dc capacitor, change of current reactor, driver element, detecting unit, protected location and control unit; Wherein: dc capacitor is parallel to the DC port of level fully controlled bridge unit; The port that exchanges of change of current reactor and level fully controlled bridge unit; Driver element, detecting unit and the protected location transmission current voltage signal that links to each other with level fully controlled bridge unit respectively; Driver element, detecting unit and protected location link to each other with control unit respectively and transmit start pulse signal, current and voltage signals and fault-signal, and control unit links to each other with industrial computer and transmits running state information and command signal.
Be based on described control unit two closed loops and the vector control of pi regulator realize.
Compared with prior art, the invention has the beneficial effects as follows:
1. require can realize single-ended wind field is incorporated into the power networks according to different system, the multiterminal wind field is incorporated into the power networks or directly the different DC transmission systems of passive load power supply is simulated.Detailed process can be simply accomplished with contactor, between the DC side of each current transformer end points and system's dc bus, adds contactor, through closed or break off the corresponding contact device and realize that this end points inserts the purpose that perhaps breaks away from the direct current transportation network.For example simulate the single-ended wind field DC transmission system that is incorporated into the power networks, can the closed D.C. contactor of generator side converter arbitrarily, make it insert DC network, connect any grid side current transformer through contactor again and get final product.If simulation multiterminal DC transmission system can break off the load-side contactor, other contactors are all closed, make other four end points except that the end points of resistance place all incorporate the DC network operation into.If analogue system supplies power to passive load, contactor that then can closed load end points, and the contactor of other any one or more active system end points makes it incorporate the DC network operation into to get final product.
2. because the integrated CAN bus unit of main control part dsp chip; Can carry out network communication between each current transformer and the industrial computer; Data and running state data are detected in this locality be transferred to upper industrial computer and show and handle, be convenient to carry out the check of data analysis and systematic function.
3. because the current transformer controller partly adopts the STD bus form; Make systems control division divide the design modularization; Interface can be realized standardization; Can insert control corresponding unit (being the DSP control board) according to the concrete form (two level or many level) that system power part main circuit is adopted, also can expand new functional module, provide convenience for improving functions of the equipments according to standard interface.
4. the feasible system transient performance is analyzed, and through controlling the moment break-make of corresponding GTO, the assessment and the checking of some control methods of systematic function are convenient to the test of the ability to bear of transient state fault in the realization system.
Description of drawings
Fig. 1 is the system configuration sketch map of embodiment.
Embodiment
Below in conjunction with accompanying drawing system of the present invention is further described: present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment
As shown in Figure 1; Present embodiment comprises: computer, two wind energy turbine set devices, the first transformer TR1, the second transformer TR2, the 3rd transformer TR3, the 4th transformer TR4, the 5th transformer TR5, five switch controlling devices, industrial computer, first high pass filtering device 1, second high pass filtering device 2, the 3rd high pass filtering device 3, the 4th high pass filtering device 4, the 5th high pass filtering device 5, the first D.C. contactor K13, the second D.C. contactor K24, the 3rd direct contactor K35, the 4th D.C. contactor K41, the 5th D.C. contactor K51, the first convertor assembly VSC1, the second convertor assembly VSC2, the 3rd convertor assembly VSC3, the 4th convertor assembly VSC4 and the 5th convertor assembly VSC5; Wherein: the first wind energy turbine set device electric energy transmitting that links to each other with the first transformer TR1, the second wind energy turbine set device electric energy transmitting that links to each other with the second transformer TR2, the first transformer TR1 electric energy after the transmission transformation that links to each other with first switch controlling device; The second transformer TR2 electric energy of transmission after the transformation that link to each other with the second switch control device; First switch controlling device control information transmission that links to each other with the first convertor assembly VSC1, the second switch control device control information transmission that links to each other with the second convertor assembly VSC2, the first convertor assembly VSC1 links to each other with the second convertor assembly VSC2; The second convertor assembly VSC2 links to each other with the 3rd convertor assembly VSC3; The 3rd convertor assembly VSC3 links to each other with the 4th convertor assembly VSC4, and the 4th convertor assembly VSC4 links to each other with the 5th convertor assembly VSC5, and the 5th convertor assembly VSC5 links to each other with the first convertor assembly VSC1; The end of the first D.C. contactor K13 links to each other with the first convertor assembly VSC1; The other end of the first D.C. contactor K13 links to each other with the 3rd convertor assembly VSC3, and the end of the second D.C. contactor K24 links to each other with the second convertor assembly VSC2, and the other end of the second D.C. contactor K24 links to each other with the 4th convertor assembly VSC4; The end of the 3rd D.C. contactor K35 links to each other with the 3rd convertor assembly VSC3; The other end of the 3rd D.C. contactor K35 links to each other with the 5th convertor assembly VSC5, and the end of the 4th D.C. contactor K41 links to each other with the 4th convertor assembly VSC4, and the other end of the 4th D.C. contactor K41 links to each other with the first convertor assembly VSC1; The end of the 5th D.C. contactor K51 links to each other with the 5th convertor assembly VSC5; The other end of the 5th D.C. contactor K51 links to each other with the first convertor assembly VSC1, and the 3rd convertor assembly VSC3 links to each other with the 3rd switch controlling device, and the 3rd switch controlling device links to each other with the 3rd transformer TR3; The 4th convertor assembly VSC4 links to each other with the 4th switch controlling device; The 4th switch controlling device links to each other with the 4th transformer TR4, and the 5th convertor assembly VSC5 links to each other with the 5th switch controlling device, and the 5th switch controlling device links to each other with the 5th transformer TR5; The 3rd transformer TR3 electric energy transmitting that links to each other with first electrical network; The 4th transformer TR4 electric energy transmitting that links to each other with second electrical network, the 5th transformer TR5 electric energy transmitting that links to each other with passive network, the secondary side of each transformer connects a high pass filtering device respectively; Input current voltage, output current voltage, direct current voltage and operational temperature information that the other end ground connection of high pass filtering device, the output of industrial computer link to each other with computer and transmits convertor assembly.
Passive network is load Z in the present embodiment.
The described first wind energy turbine set device is used to simulate the wind energy turbine set generating; Comprise: the first generator G1 and the first generating speed regulator UF1; Wherein: the input of the first generating speed regulator UF1 electric energy transmitting that links to each other with electrical network; The first generating speed regulator UF1 links to each other with the first generator G1 and transmits the electric energy of speed governing, the first generator G1 electric energy transmitting that links to each other with the first transformer TR1.
The described second wind energy turbine set device is used to simulate the wind energy turbine set generating; Comprise: the second generator G2 and the second generating speed regulator UF2; Wherein: the input of the second generating speed regulator UF2 electric energy transmitting that links to each other with electrical network; The second generating speed regulator UF2 links to each other with the second generator G2 and transmits the electric energy of speed governing, the second generator G2 electric energy transmitting that links to each other with the second transformer TR2.
The first generator G1 and the second generator G2 in the present embodiment adopt the 5KW synchro wind generator, use double-fed generator instead and are applicable to described two wind energy turbine set devices too.
The first generating speed regulator UF1 and the second generating speed regulator UF2 adopt HIP6003-5D5GB type universal frequency converter in the present embodiment, are input as the 380V AC network, and output drives three-phase 5KW synchro wind generator.
Described first switch controlling device comprises: the first A.C. contactor K1, the first gate level turn-off thyristor GTO1 and the first earth resistance R1; Wherein: the end of the end of the first A.C. contactor K1, the first gate level turn-off thyristor GTO1 links to each other respectively with the output of the first transformer TR1 in twos; The end of the first earth resistance R1 links to each other with the other end of the first gate level turn-off thyristor GTO1; The other end ground connection of the first earth resistance R1, the other end of the first A.C. contactor K1 links to each other with the first convertor assembly VSC1.
Described second switch control device comprises: the second A.C. contactor K2, the second gate level turn-off thyristor GTO2 and the second earth resistance R2; Wherein: two ends of two ends of the second A.C. contactor K2, the second gate level turn-off thyristor GTO2 link to each other respectively with the output of the second transformer TR2 in twos; Two ends of the second earth resistance R2 link to each other with two ends in addition of the second gate level turn-off thyristor GTO2; The two end ground connection in addition of the second earth resistance R2, two ends in addition of the second A.C. contactor K2 link to each other with the second convertor assembly VSC2.
Described the 3rd switch controlling device comprises: the 3rd A.C. contactor K3, the 3rd gate level turn-off thyristor GTO3 and the 3rd earth resistance R3; Wherein: the end of the 3rd A.C. contactor K3 links to each other with the 3rd convertor assembly VSC3; The input of the end of the other end of the 3rd A.C. contactor K3, the 3rd gate level turn-off thyristor GTO3 and the 3rd transformer TR3 links to each other respectively in twos; The end of the 3rd earth resistance R3 links to each other with the 3rd gate level turn-off thyristor GTO3, the other end ground connection of the 3rd earth resistance R3.
Described the 4th switch controlling device comprises: the 4th A.C. contactor K4, the 4th gate level turn-off thyristor GTO4 and the 4th earth resistance R4; Wherein: the end of the 4th A.C. contactor K4 links to each other with the 4th convertor assembly VSC4; The input of the end of the other end of the 4th A.C. contactor K4, the 4th gate level turn-off thyristor GTO4 and the 4th transformer TR4 links to each other respectively in twos; The end of the 4th earth resistance R4 links to each other with the 4th gate level turn-off thyristor GTO4, the other end ground connection of the 4th earth resistance R4.
Described the 5th switch controlling device comprises: the 5th A.C. contactor K5, the 5th gate level turn-off thyristor GTO5 and the 5th earth resistance R5; Wherein: the end of the 5th A.C. contactor K5 links to each other with the 5th convertor assembly VSC5; The input of the end of the other end of the 5th A.C. contactor K5, the 5th gate level turn-off thyristor GTO5 and the 5th transformer TR5 links to each other respectively in twos; The end of the 5th earth resistance R5 links to each other with the 5th gate level turn-off thyristor GTO5, the other end ground connection of the 5th earth resistance R5.
A.C. contactor all adopts LC1-DT40 in the present embodiment, and gate level turn-off thyristor all adopts the SG600R21 of Toshiba, and the resistance of earth resistance all is 1 Ω, and the rated power of earth resistance all is 100W.
What industrial computer adopted in the present embodiment is that model is the magnificent industrial computer of grinding of IPC-610, and this industrial computer is provided with the data collecting card of model PCL-818L.Data collecting card links to each other with each convertor assembly and transmits the operation information of convertor assembly, and industrial computer links to each other with each convertor assembly successively through communication cable and transmits the command information of operation.
The operation information of described convertor assembly comprises: the input current voltage of convertor assembly, output current voltage, direct current voltage and operating temperature.
The command information of described operation comprises: direct voltage set-point, active power set-point, reactive power set-point and alternating voltage set-point.
Transformer adopting all is that capacity is the three-phase transformer of 40kVA in the present embodiment, and its electric pressure is 380V.
Described high pass filtering device is used for the high order harmonic component around the filtering PWM switching frequency; Comprise: star-like electric capacity of three-phase and inductance; Wherein: an end of inductance links to each other with the secondary side of transformer, and the other end of inductance links to each other with the star-like electric capacity of three-phase, the star-like capacity earth of three-phase.The resonance frequency of high pass filtering device is 27 times and 54 times in the present embodiment.
The described first convertor assembly VSC1 comprises: the first level fully controlled bridge unit, first dc capacitor, first change of current reactor, first driver element, first detecting unit, first protected location and first control unit; Wherein: first dc capacitor is parallel to the DC port of the first level fully controlled bridge unit; The port that exchanges of first change of current reactor and the first level fully controlled bridge unit; First driver element, first detecting unit and first protected location transmission current voltage signal that links to each other with the first level fully controlled bridge unit respectively; First driver element, first detecting unit and first protected location link to each other with first control unit respectively and transmit start pulse signal, current and voltage signals and fault-signal, and first control unit links to each other with industrial computer and transmits running state information and command signal.
The described second convertor assembly VSC2 comprises: the second level fully controlled bridge unit, second dc capacitor, second change of current reactor, second driver element, second detecting unit, second protected location and second control unit; Wherein: second dc capacitor is parallel to the DC port of the second level fully controlled bridge unit; The port that exchanges of second change of current reactor and the second level fully controlled bridge unit; Second driver element, second detecting unit and second protected location transmission current voltage signal that links to each other with the second level fully controlled bridge unit respectively; Second driver element, second detecting unit and second protected location link to each other with second control unit respectively and transmit start pulse signal, current and voltage signals and fault-signal, and second control unit links to each other with industrial computer and transmits running state information and command signal.
Described the 3rd convertor assembly VSC3 comprises: the 3rd level fully controlled bridge unit, the 3rd dc capacitor, the 3rd change of current reactor, the 3rd driver element, the 3rd detecting unit, the 3rd protected location and the 3rd control unit; Wherein: the 3rd dc capacitor is parallel to the DC port of the 3rd level fully controlled bridge unit; The port that exchanges of the 3rd change of current reactor and the 3rd level fully controlled bridge unit; The 3rd driver element, the 3rd detecting unit and the 3rd protected location transmission current voltage signal that links to each other with the 3rd level fully controlled bridge unit respectively; The 3rd driver element, the 3rd detecting unit and the 3rd protected location link to each other with the 3rd control unit respectively and transmit start pulse signal, current and voltage signals and fault-signal, and the 3rd control unit links to each other with industrial computer and transmits running state information and command signal.
Described the 4th convertor assembly VSC4 comprises: the 4th level fully controlled bridge unit, the 4th dc capacitor, the 4th change of current reactor, 4 wheel driven moving cell, the 4th detecting unit, the 4th protected location and the 4th control unit; Wherein: the 4th dc capacitor is parallel to the DC port of the 4th level fully controlled bridge unit; The port that exchanges of the 4th change of current reactor and the 4th level fully controlled bridge unit; 4 wheel driven moving cell, the 4th detecting unit and the 4th protected location transmission current voltage signal that links to each other with the 4th level fully controlled bridge unit respectively; 4 wheel driven moving cell, the 4th detecting unit and the 4th protected location link to each other with the 4th control unit respectively and transmit start pulse signal, current and voltage signals and fault-signal, and the 4th control unit links to each other with industrial computer and transmits running state information and command signal.
Described the 5th convertor assembly VSC5 comprises: the 5th level fully controlled bridge unit, the 5th dc capacitor, the 5th change of current reactor, the 5th driver element, the 5th detecting unit, five guarantees are protected unit and the 5th control unit; Wherein: the 5th dc capacitor is parallel to the DC port of the 5th level fully controlled bridge unit; The port that exchanges of the 5th change of current reactor and the 5th level fully controlled bridge unit; The 5th driver element, the 5th detecting unit and five guarantees are protected the unit transmission current voltage signal that links to each other with the 5th level fully controlled bridge unit respectively; The 5th driver element, the 5th detecting unit and five guarantees are protected unit link to each other with the 5th control unit respectively transmission start pulse signal, current and voltage signals and fault-signal, and the 5th control unit links to each other with industrial computer and transmits running state information and command signal.
The routine that the is based on IGBT two level full-controlled bridge structures that the first level fully controlled bridge unit, the second level fully controlled bridge unit and the 3rd level fully controlled bridge unit adopt in the present embodiment, taking in twos by 6 integrated fly-wheel diodes of IGBT, a prescription formula constitutes the three-phase fully-controlled bridge construction.That the IGBT in the present embodiment adopts is the H20R1202 of Infineon, includes the inverse parallel diode, rated current 20A, voltage 1200V.
What the 4th level fully controlled bridge unit and the 5th level fully controlled bridge unit adopted in the present embodiment is diode clamp three level main circuit topological structures; Each brachium pontis contains 4 switching devices; Can system's withstand voltage be doubled, wherein, except comprising full control switching device and fly-wheel diode; Also contain 6 clamp diodes, guarantee that each full control device bears identical counter voltage.
The model that D.C. contactor in the present embodiment adopts all is Shi Naide LPZ1-50, and dc capacitor is that the capacitances in series of two 3300 μ F/750V forms.
Detecting unit all comprises in the present embodiment: Hall current sensor and Hall voltage transducer.
What control unit in the present embodiment adopted all is the DSP28335 chip, and is based on two closed loops and the vector control realization of pi regulator.
The course of work of present embodiment:
1) as the closed first D.C. contactor K13, the second D.C. contactor K24 and the 3rd D.C. contactor K35; Break off the 4th D.C. contactor K41 and the 5th D.C. contactor K51; And closed first A.C. contactor K1 of while and the 5th A.C. contactor K5; When breaking off the second A.C. contactor K2, the 3rd A.C. contactor K3 and the 4th A.C. contactor K4, the first generator G1 and first electrical network insert DC network, constitute single-ended DC transmission system.
2) as closed first A.C. contactor K1 and the 3rd A.C. contactor K3; Break off the second A.C. contactor K2, the 4th A.C. contactor K4 and the 5th A.C. contactor K5; And the closed first D.C. contactor K13 of while, the 3rd D.C. contactor K35 and the 4th D.C. contactor K41; When breaking off the second D.C. contactor K24 and the 5th D.C. contactor K51, the first generator G1 and load Z insert DC network, constitute the experimental system of wind power plant to the passive system power supply.
3) when closed all A.C. contactors, when breaking off all D.C. contactors simultaneously, then all convertor assembly connecting systems constitute the five terminal DC transmission system.
Present embodiment can through each contactor break-make mode of combination in any, constitute various single-ended and multiterminal DC power transmission system Automatic System Test Units as required.To electrical network transient state fault; The characteristic of utilizing gate level turn-off thyristor can bear big electric current of short time, it is open-minded to control corresponding current transformer node AC side gate level turn-off thyristor moment through square-wave pulse, turn-offs then; Make AC side that moment shorted to earth fault take place; Simulation electrical network moment shorted to earth situation, test macro transient response performance and antijamming capability, each not conducting of GTO when system normally moves.
The various main application fields (wind field is incorporated into the power networks, to isolated island power supply, multiterminal transmission system etc.) of the switching simulation HVDC Light of present embodiment through contactor have versatility, avoid the variation of practical application and some overlapping development of causing.Adopt dsp processor to be the control core, processing speed is fast, can verify various complicated approach and support CAN bus communication network.Adopt industrial computer as host computer, can realize data record analysis and friendly man-machine interface.Adopt element with small capacity to the whole bag of tricks and the checking of various connected mode, volume is little, and cost is low relatively, is convenient to install and implement.
Claims (6)
1. the light direct current supply experiment system of an offshore grid-connected wind farm, comprising: two wind energy turbine set devices, five transformers, five convertor assemblys, industrial computer and five high pass filtering devices is characterized in that; Also comprise: five switch controlling devices and five D.C. contactors, wherein: the first wind energy turbine set device electric energy transmitting that links to each other with first transformer, the second wind energy turbine set device electric energy transmitting that links to each other with second transformer; First transformer electric energy of transmission after the transformation that link to each other with first switch controlling device, second transformer link to each other with the second switch control device and transmit the electric energy after the transformation, first switch controlling device control information transmission that links to each other with first convertor assembly; The second switch control device control information transmission that links to each other with second convertor assembly, first convertor assembly links to each other with second convertor assembly, and second convertor assembly links to each other with the 3rd convertor assembly; The 3rd convertor assembly links to each other with the 4th convertor assembly, and the 4th convertor assembly links to each other with the 5th convertor assembly, and the 5th convertor assembly links to each other with first convertor assembly; One end of first D.C. contactor links to each other with first convertor assembly, and the other end of first D.C. contactor links to each other with the 3rd convertor assembly, and an end of second D.C. contactor links to each other with second convertor assembly; The other end of second D.C. contactor links to each other with the 4th convertor assembly; One end of the 3rd D.C. contactor links to each other with the 3rd convertor assembly, and the other end of the 3rd D.C. contactor links to each other with the 5th convertor assembly, and an end of the 4th D.C. contactor links to each other with the 4th convertor assembly; The other end of the 4th D.C. contactor links to each other with first convertor assembly; One end of the 5th D.C. contactor links to each other with the 5th convertor assembly, and the other end of the 5th D.C. contactor links to each other with first convertor assembly, and the 3rd convertor assembly links to each other with the 3rd switch controlling device; The 3rd switch controlling device links to each other with the 3rd transformer; The 4th convertor assembly links to each other with the 4th switch controlling device, and the 4th switch controlling device links to each other with the 4th transformer, and the 5th convertor assembly links to each other with the 5th switch controlling device; The 5th switch controlling device links to each other with the 5th transformer; The 3rd transformer electric energy transmitting that links to each other with first electrical network, the 4th transformer electric energy transmitting that links to each other with second electrical network, the 5th transformer electric energy transmitting that links to each other with passive network; The secondary side of each transformer connects a high pass filtering device respectively, the other end ground connection of high pass filtering device;
Each switch controlling device includes: A.C. contactor, gate level turn-off thyristor and earth resistance; Wherein: a common end after an end of A.C. contactor links to each other with an end of gate level turn-off thyristor as switch controlling device; One end of earth resistance links to each other with the other end of gate level turn-off thyristor; The other end ground connection of earth resistance, the other end of A.C. contactor is as the other end of switch controlling device.
2. the light direct current supply experiment system of offshore grid-connected wind farm according to claim 1; It is characterized in that; Each wind energy turbine set device includes: generator and generating speed regulator; Wherein: the input electric energy transmitting that links to each other with electrical network of generating speed regulator, the speed regulator that generates electricity links to each other with generator and transmits the electric energy of speed governing, the generator electric energy transmitting that links to each other with transformer.
3. the light direct current supply experiment system of offshore grid-connected wind farm according to claim 1 is characterized in that, described industrial computer is provided with data collecting card.
4. the light direct current supply experiment system of offshore grid-connected wind farm according to claim 1; It is characterized in that; Each high pass filtering device includes: star-like electric capacity of three-phase and inductance; Wherein: an end of inductance links to each other with the secondary side of transformer, and the other end of inductance links to each other with the star-like electric capacity of three-phase, the star-like capacity earth of three-phase.
5. the light direct current supply experiment system of offshore grid-connected wind farm according to claim 1; It is characterized in that; Each convertor assembly includes: level fully controlled bridge unit, dc capacitor, change of current reactor, driver element, detecting unit, protected location and control unit; Wherein: dc capacitor is parallel to the DC port of level fully controlled bridge unit; Change of current reactor links to each other with the port that exchanges of level fully controlled bridge unit; Driver element, detecting unit and the protected location transmission current voltage signal that links to each other with level fully controlled bridge unit respectively, driver element, detecting unit and protected location link to each other with control unit respectively transmission start pulse signal, current and voltage signals and fault-signal, control unit links to each other with industrial computer and transmits running state information and command signal.
6. the light direct current supply experiment system of offshore grid-connected wind farm according to claim 5 is characterized in that, described control unit is based on that two closed loops and the vector control of pi regulator realize.
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