Fundamental voltage sharing type medium-voltage active power filter
A technology of power filter and fundamental voltage, applied in active power filter, AC network to reduce harmonic/ripple, harmonic reduction device, etc., can solve the problems of high cost, complex control system, and many unit modules
Inactive Publication Date: 2014-01-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology
However, the active power filter using cascaded H-bridge multi-level inverters requires the control of multiple independent DC capacitor voltages, and the control system is complex
When it is applied to medium and high voltage levels, there are many cascaded unit modules, the cost is high, and the structure is relatively complicated, which limits its application
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[0018] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. It should be emphasized that the following embodiments are illustrative, not restrictive, and should not be used as limitations of the present invention.
[0019] A fundamental voltage sharing medium voltage active power filter, such as figure 1 As shown, it includes a three-phase inverter 4, three-phase H-bridge cascaded inverter unit modules 3 of N groups for each phase, three identical inductors 2 for each phase, and three identical AC capacitors 1 for each phase, three-phase The output terminals of each phase of the inverter are respectively connected in series with N groups of H-bridge cascaded inverter unit modules for each phase, each phase inductor and each phase AC capacitor, and then connected in parallel with the power grid.
[0020] In each phase of the circuit formed by series connection of an AC capacitor and an inductor, the or...
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The invention relates to a fundamental voltage sharing type medium-voltage active power filter. The fundamental voltage sharing type medium-voltage active power filter comprises a three-phase inverter, three-phase H bridge cascaded inverting unit modules with each phase of H bridge cascaded inverting unit modules divided into N sets and three inductors with each phase being the same. The fundamental voltage sharing type medium-voltage active power filter further comprises three alternating-current capacitors with each phase being the same, and each phase of output end of the three-phase inverter is connected with each phase of N-set H bridge cascaded inverting unit modules, each phase of inductors and each phase of alternating current capacitors in series, and then is connected with a power grid in parallel. According to the fundamental voltage sharing type medium-voltage active power filter, the number of the inverting unit modules of the active power filter can be greatly reduced, the cost is lowered, the structure of a compensation device is simplified, the reliability of the device is improved, the size of the device is decreased, and full play is given to the harmonic wave compensating capacity of the active power filter.
Description
technical field [0001] The invention belongs to the technical field of harmonic compensation devices for medium-voltage distribution networks, in particular to a fundamental-wave voltage sharing type medium-voltage active power filter. Background technique [0002] Various high-power power electronic devices are increasingly widely used. While these devices greatly improve production efficiency, they also bring great harmonic pollution to the power system, causing overload, overheating, and increased loss of electrical equipment. Overvoltage, protection malfunction and other hazards, so the demand for power grid harmonic control is increasing. [0003] The active power filter is an active comprehensive compensation device composed of fully controlled power electronic devices. It has high controllability and fast response. It can compensate harmonics with changing frequency and size, and can avoid resonance with the power grid. [0004] However, the high cost is the main fac...
Claims
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CPCY02E40/40Y02E40/20
Inventor 刘亚丽李国栋袁世强胡晓辉袁中琛王峥王瑶徐永海
Owner STATE GRID CORP OF CHINA