CN102944768A - Continuous current running test method for half-bridge sub-modules of multilevel converter - Google Patents
Continuous current running test method for half-bridge sub-modules of multilevel converter Download PDFInfo
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Abstract
The invention relates to a continuous current running test method for half-bridge sub-modules of a multilevel converter. The continuous current running test method comprises the steps as follows: 1), direct current voltages are applied to the two ends of a test sample sub-module, a capacitor (Csm) of the test sample sub-module and capacitor branches connected to the two ends of the test sample sub-module are charged, and electrical branches of the capacitor branches are formed by connecting two direct current filter capacitors (C1 and C2) in sequence; and 2), after the charging is completed, the switching between an upper switch device and a lower switch device of the test sample sub-module are controlled, and a continuous controllable current is formed on an inductor (L). The continuous current running test method is used for solving the problem of verifying bearing situations of the sub-modules of the converter under running conditions by using a test.
Description
Technical field
The present invention relates to the semibridge system submodule continuous current operating test device in flexible DC power transmission (VSC-HVDC) field, particularly multilevel converter based on voltage source converter.
Background technology
Along with development and the application of Power Electronic Technique in electric system of all-controlling power electronics device, day by day come into one's own based on flexible DC power transmission (VSC-HVDC) technology of voltage source converter.Modularization multi-level converter (Modular Multilevel Converter) is a kind of of the voltage source converter used in the VSC-HVDC system, it is formed by connecting according to certain mode by a plurality of half-bridges or full-bridge type submodule, make the alternating voltage of transverter output approach sine wave by input and the excision state of controlling respectively each submodule IGBT assembly, realize the high efficiency of transmission of energy.
The semibridge system submodule is comprised of two IGBT assembly T1, T2 and diode Dsm1, Dsm2 and submodule capacitor Csm as shown in Figure 1.IGBT assembly T1 and diode Dsm1 inverse parallel form IGBT/Diode module 1, and IGBT assembly T2 and diode Dsm2 inverse parallel form IGBT/Diode module 2; IGBT/Diode module 1 and IGBT/Diode module 2 are sequentially connected rear and submodule capacitor C sm is connected in parallel, and the submodule upper end is negative terminal for anode, lower end.
VSC-HVDC is when carrying out large volume transport, and voltage source converter is high voltage, large electric current operation for a long time, and its reliability is the key of safe operation of power system.So each submodule must carry out test run before putting into operation, yet if test by building a load environment identical with actual condition, then need the cooperation of whole transverter and related system, almost be as good as with real system, so this test method is infeasible.Therefore, must make up an equivalent test platform, the transverter submodule is carried out the verification experimental verification suitable with actual condition intensity.
Summary of the invention
The purpose of this invention is to provide a kind of transverter semibridge system submodule continuous current running test method, in order to how to solve the problem with the bear situation of verification experimental verification transverter submodule under operating condition.
For achieving the above object, the solution of the present invention is: a kind of transverter semibridge system submodule continuous current running test method, transverter semibridge system submodule continuous current operating test device is set, comprise an adjustable ac source that connects successively, bridge-type is control rectifying circuit and dc bus not, be provided with the DC side filter capacitor (C1, C2) of series connection between the direct current positive and negative busbar, direct current positive bus is used for connecting test product submodule anode, and the direct current negative busbar is used for connecting test product submodule negative terminal; The series connection point of described DC filter capacitors (C1, C2) connects an inductance (L), this series connection point is used for connecting by this inductance (L) two switching device tie points (m) of test product submodule, the test method step is as follows: 1) add DC voltage at the two ends of test product submodule, for the electric capacity (Csm) of test product submodule be connected to the capacitor branch road charging at test product submodule two ends, described two DC filter capacitors of route (C1, the C2) series connection of capacitor branch road electricity consists of; 2) charging complete after, the switching of control test product submodule upper and lower switching device is at continuous, the controlled electric current of inductance (L) formation.
By adjustable ac source connecting successively and bridge-type not control rectifying circuit be described charging paths charging.
Adopt the switching of the upper and lower switching device of SPWM control mode control test product submodule.
Also be provided with a discharge paths, discharge paths is in parallel with charging paths; In described step 2) after the certain time, start discharge paths and discharge.
Described discharge paths is in series by discharge control switch (KM) and discharge resistance (R).Among the present invention, by building a test platform with the actual condition equivalence, realized the checking to the continuous current runnability under the large electric current of Modularized multi-level converter sub-module, high voltage and the steady state thermal strength condition.Thus, flexible DC power transmission modularization multi-level converter semibridge system submodule continuous current operating test device provided by the invention can satisfy the requirement of submodule continuous current running test.In addition, submodule continuous current test unit provided by the invention, only by the control to two IGBT devices of test product submodule, can realize easily the continuous wave output of large electric current on the inductance, flexible operation has been realized good reproduction to modularization multi-level converter semibridge system submodule actual condition electric current.
Scheme provided by the invention makes the long-time tolerance of the test product submodule IGBT assembly continuous current suitable with actual condition, and can fully examine the heating situation of IGBT assembly, test unit simple and flexible, easy to operate can satisfy the requirement of flexible DC power transmission multilevel converter semibridge system submodule running test.
Description of drawings
Fig. 1 is semibridge system submodular circuits schematic diagram;
Fig. 2 is the pilot system circuit theory diagrams;
Fig. 3 is continuous current running test current waveform;
Fig. 4 is continuous current running test voltage waveform.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
Pilot system as shown in Figure 2 is made of test unit and test product submodule.Test unit comprises: three-phase regulator TY, three-phase voltage increasing rectifier transformer TR, three-phase commutation bridge, discharge control switch KM, discharge resistance R, DC side filter capacitor C1, C2 and inductance L; DC side filter capacitor C1, C2 are connected between the dc bus; Two switching device tie point m of test product submodule link to each other with capacitor C1, C2 series connection point DCO by inductance L; Test product submodule capacitor Csm positive pole links to each other with direct current positive bus, and negative pole links to each other with the direct current negative busbar.Discharge paths is connected between the direct current positive and negative busbar, is in series by discharge control switch KM and discharge resistance R.
During on-test, regulate pressure regulator TY, set up DC bus-bar voltage by transformer, rectifier bridge, simultaneously capacitor C1, C2 and test product submodule capacitor Csm are charged, after DC bus-bar voltage reaches testing requirements, stop to regulate pressure regulator; After capacitor C1, C2 and submodule capacitor Csm charging is finished, the trigger pulse of output high-power insulated gate bipolar thyristor IGBT device, submodule is operated in the continuous current running status; The test product submodule is operated in space vector pulse width modulation SPWM(Sinusoidal Pulse Width Modulation) under the mode, by the switching control to IGBT module about the test product submodule, can change the voltage that two IGBT modules connect mid point, the DC level that connects mid point with respect to two capacitors, formed a controlled voltage in inductance L, thereby produce a controlled electric current, this electric current test product submodule of flowing through, make the tolerance of test product submodule with same abominable strength of current and the hot strength of actual condition, realize the purpose to submodule continuous current running test.After the off-test, the trigger pulse of locking IGBT device, Closing Switch KM discharges the energy among capacitor C1, C2 and the submodule capacitor C sm complete.
Provided as shown in Figure 2 modularization multi-level converter semibridge system submodule continuous current running test current waveform.The current waveform effective value is 1200A, and the cycle is 50Hz, is sinusoidal wave form.
Provided as shown in Figure 3 modularization multi-level converter semibridge system submodule continuous current running test voltage waveform.Comprise submodule capacitor C sm voltage and capacitor C1, C2 voltage.Submodule continuous current running test submodule capacitance voltage waveform is the DC voltage of band fluctuation, and mean value is 1030V, and the frequency of voltage fluctuation is 100Hz, and the fluctuation peak-to-peak value is 40V; The voltage of capacitor C1, C2 also is the DC voltage of band fluctuation, and mean value is 515V, and the voltage fluctuation frequency is 50Hz, and the fluctuation peak-to-peak value is 210V.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; after the those skilled in the art reads the application; the present invention is carried out the behavior of various modifications or change with reference to above-described embodiment, all within right application requirement protection domain of the present invention is awaited the reply in application.
Claims (5)
1. multilevel converter semibridge system submodule continuous current running test method, it is characterized in that, transverter semibridge system submodule continuous current operating test device is set, comprise an adjustable ac source that connects successively, bridge-type is control rectifying circuit and dc bus not, be provided with the DC side filter capacitor (C1, C2) of series connection between the direct current positive and negative busbar, direct current positive bus is used for connecting test product submodule anode, and the direct current negative busbar is used for connecting test product submodule negative terminal; The series connection point of described DC filter capacitors (C1, C2) connects an inductance (L), this series connection point is used for connecting by this inductance (L) two switching device tie points (m) of test product submodule, the test method step is as follows: 1) add DC voltage at the two ends of test product submodule, for the electric capacity (Csm) of test product submodule be connected to the capacitor branch road charging at test product submodule two ends, described two DC filter capacitors of route (C1, the C2) series connection of capacitor branch road electricity consists of; 2) charging complete after, the switching of control test product submodule upper and lower switching device is at continuous, the controlled electric current of inductance (L) formation.
2. multilevel converter semibridge system submodule continuous current running test method according to claim 1 is characterized in that, by adjustable ac source connecting successively and bridge-type not control rectifying circuit be described charging paths charging.
3. multilevel converter semibridge system submodule continuous current running test method according to claim 1 is characterized in that, adopts the switching of the upper and lower switching device of SPWM control mode control test product submodule.
4. transverter semibridge system submodule continuous current running test method according to claim 3 is characterized in that, also be provided with a discharge paths, discharge paths is in parallel with charging paths; In described step 2) after the certain time, start discharge paths and discharge.
5. multilevel converter semibridge system submodule continuous current running test method according to claim 4 is characterized in that, described discharge paths is in series by discharge control switch (KM) and discharge resistance (R).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105991054A (en) * | 2015-03-06 | 2016-10-05 | 南京南瑞继保电气有限公司 | Converter sub module, control method and converter |
| CN106932664A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of flexible direct current transmission sub-module steady state test device and its test method |
| CN109946600A (en) * | 2019-04-03 | 2019-06-28 | 国网冀北电力有限公司电力科学研究院 | Detect the device and control method of converter valve submodule internal electric performance |
| CN114167167A (en) * | 2021-11-15 | 2022-03-11 | 许继集团有限公司 | Modular multilevel converter short-circuit current test device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105991054A (en) * | 2015-03-06 | 2016-10-05 | 南京南瑞继保电气有限公司 | Converter sub module, control method and converter |
| CN106932664A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of flexible direct current transmission sub-module steady state test device and its test method |
| CN109946600A (en) * | 2019-04-03 | 2019-06-28 | 国网冀北电力有限公司电力科学研究院 | Detect the device and control method of converter valve submodule internal electric performance |
| CN109946600B (en) * | 2019-04-03 | 2024-02-13 | 国网冀北电力有限公司电力科学研究院 | Device for detecting internal electrical performance of converter valve submodule and control method |
| CN114167167A (en) * | 2021-11-15 | 2022-03-11 | 许继集团有限公司 | Modular multilevel converter short-circuit current test device and test method |
| CN114167167B (en) * | 2021-11-15 | 2024-02-09 | 许继集团有限公司 | Short-circuit current test device and test method for modularized multi-level converter |
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