CN102944768B - 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, flexible DC power transmission (VSC-HVDC) technology based on voltage source converter comes into one's own day by day.Modularization multi-level converter (Modular Multilevel Converter) is the one of the voltage source converter applied in VSC-HVDC system, it is formed by connecting according to certain mode by multiple half-bridge or full-bridge type submodule, alternating voltage transverter being exported by the input and excision state that control each submodule IGBT assembly respectively approaches sine wave, realizes the high efficiency of transmission of energy.
Semibridge system submodule as shown in Figure 1, is made up of two IGBT assembly T1, T2 and diode Dsm1, Dsm2 and submodule capacitor Csm.IGBT assembly T1 and diode Dsm1 inverse parallel form IGBT/Diode module 1, IGBT assembly T2 and diode Dsm2 inverse parallel forms IGBT/Diode module 2; Be connected in parallel with submodule electric capacity Csm after IGBT/Diode module 1 and IGBT/Diode module 2 sequential series, submodule upper end is anode, lower end is negative terminal.
VSC-HVDC is when carrying out Large Copacity transmission, and voltage source converter must high voltage, big current run 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, if but test by building a load circumstance 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, an equivalent test platform must be built, the verification experimental verification suitable with actual condition intensity is carried out to transverter submodule.
Summary of the invention
The object of this invention is to provide a kind of transverter semibridge system submodule continuous current running test method, in order to solve how by the problem of 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 the adjustable ac source connected successively, a bridge-type uncontrollable rectifier circuit and DC bus, be provided with the DC side filter capacitor (C1, C2) of series connection between direct current positive and negative busbar, direct current positive bus is for connecting test product submodule anode, and direct current negative busbar is 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 two switching devices tie point (m) being connected test product submodule by this inductance (L), test method step is as follows: 1) add DC voltage at the two ends of test product submodule, for test product submodule electric capacity (Csm) and be connected to the capacitor branches charging at test product submodule two ends, described in capacitor branches electricity route, two DC filter capacitors (C1, C2) are in series; 2) after charging, the switching of the upper and lower switching device of test product submodule is controlled, at the electric current that the upper formation of inductance (L) is continuous, controlled.
Be the charging of described charging paths by an adjustable ac source connecting successively and a bridge-type uncontrollable rectifier circuit.
SPWM control mode is adopted to control the switching of the upper and lower switching device of test product submodule.
Also be provided with a discharge paths, discharge paths is in parallel with charging paths; In described step 2) after certain time, star t-up discharge branch road discharges.
Described discharge paths is in series by discharge control switch (KM) and discharge resistance (R).In the present invention, by build one with the test platform of actual condition equivalence, achieve the checking to the continuous current runnability under Modularized multi-level converter sub-module big current, high voltage and 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 meet the requirement of submodule continuous current running test.In addition, submodule continuous current test unit provided by the invention, by means of only the control to test product submodule two IGBT device, the continuous output of big current on inductance can be realized easily, flexible operation, achieves good reproduction to modularization multi-level converter semibridge system submodule actual condition electric current.
Scheme provided by the invention makes test product submodule IGBT component for long periods tolerate the continuous current suitable with actual condition, and fully can examine the heat condition of IGBT assembly, test unit simple and flexible, easy to operate, the requirement of flexible DC power transmission multilevel converter semibridge system submodule running test can be met.
Accompanying drawing explanation
Fig. 1 is semibridge system submodular circuits schematic diagram;
Fig. 2 is pilot system circuit theory diagrams;
Fig. 3 is continuous current running test current waveform;
Fig. 4 is continuous current running test voltage waveform.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Pilot system as shown in Figure 2, is made up 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 DC bus; Two switching device tie point m of test product submodule are connected with capacitor C1, C2 series connection point DCO by inductance L; Test product submodule capacitor Csm positive pole is connected with direct current positive bus, and negative pole is connected with direct current negative busbar.Discharge paths is connected between 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, capacitor C1, C2 and test product submodule capacitor Csm are charged simultaneously, reach after testing requirements until DC bus-bar voltage and stop regulating pressure regulator, after capacitor C1, C2 and submodule capacitor Csm charging complete, export the trigger pulse of high-power insulated gate bipolar thyristor IGBT device, submodule is operated in continuous current running status, test product submodule is operated in space vector pulse width modulation SPWM(Sinusoidal Pulse Width Modulation) under mode, by controlling the switching of the upper and lower IGBT module of test product submodule, the voltage that two IGBT module connect mid point can be changed, the DC level of mid point is connected relative to two capacitors, inductance L defines a controlled voltage, thus the electric current that generation one is controlled, this electric current flows through test product submodule, test product submodule is made to tolerate with actual condition strength of current severe equally and hot strength, realize the object to submodule continuous current running test.After off-test, the trigger pulse of locking IGBT device, Closing Switch KM, by complete for the fault offset in capacitor C1, C2 and submodule electric capacity Csm.
Give modularization multi-level converter semibridge system submodule continuous current running test current waveform as shown in Figure 2.Current waveform effective value is 1200A, and the cycle is 50Hz, in sine wave.
Give modularization multi-level converter semibridge system submodule continuous current running test voltage waveform as shown in Figure 3.Comprise submodule electric capacity Csm voltage and capacitor C1, C2 voltage.Submodule continuous current running test submodule capacitor voltage waveform is the DC voltage of band fluctuation, and mean value is 1030V, and the frequency of voltage fluctuation is 100Hz, and fluctuation peak-to-peak value is 40V; The voltage of capacitor C1, C2 is also the DC voltage of band fluctuation, and mean value is 515V, and voltage fluctuation frequency is 50Hz, and 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 those skilled in the art reads the application; with reference to above-described embodiment, the present invention is carried out to the behavior of various modifications or change, all within right application requirement protection domain of the present invention is awaited the reply in application.
Claims (5)
1. a 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 the adjustable ac source connected successively, a bridge-type uncontrollable rectifier circuit and direct current positive and negative busbar, be provided with two DC filter capacitors (C1, C2) of series connection between direct current positive and negative busbar, direct current positive bus is for connecting test product submodule anode, and direct current negative busbar is for connecting test product submodule negative terminal; The series connection point of described two DC filter capacitors (C1, C2) connects an inductance (L), this series connection point is used for two switching devices tie point (m) being connected test product submodule by this inductance (L), test method step is as follows: 1) add DC voltage at the two ends of test product submodule, for test product submodule electric capacity (Csm) and be connected to test product submodule two ends capacitor branches charging, capacitor branches is in series by described two DC filter capacitors (C1, C2); 2) after charging, control the switching of the upper and lower switching device of test product submodule, change the voltage that upper and lower switching device connects mid point, at the electric current that the upper formation of inductance (L) is continuous, controlled.
2. multilevel converter semibridge system submodule continuous current running test method according to claim 1, it is characterized in that, be the electric capacity (Csm) of test product submodule by an adjustable ac source connecting successively and bridge-type uncontrollable rectifier circuit and be connected to the capacitor branches charging at test product submodule two ends.
3. multilevel converter semibridge system submodule continuous current running test method according to claim 1, is characterized in that, adopts SPWM control mode to control the switching of the upper and lower switching device of test product submodule.
4. multilevel converter semibridge system submodule continuous current running test method according to claim 3, it is characterized in that, be also provided with a discharge paths, discharge paths is in parallel with capacitor branches; In described step 2) after certain time, star t-up discharge branch road discharges.
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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| 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 |
| 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 |
| 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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