Bus interface converter control method for unified compensation of alternating-current unbalanced voltage and direct-current pulsating voltage
A technology of interface converter and DC pulsation, which is applied to the layout of AC and DC network circuits, the conversion of AC power input to DC power output, and AC network circuits, etc. It can solve problems such as different voltage quality and problems, and achieve improved utilization and suppression Effect of secondary fluctuation and reduction of DC bus capacitor capacity
Pending Publication Date: 2020-10-02
TAIYUAN UNIV OF TECH
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[0004] In order to solve the problem of different voltage quality caused by the coupling of double-frequency fluctuating power between AC and DC subnets under the condition of voltage imbalance, the present invention designs a unified AC unbalanced voltage and DC pulsating voltage for the defects of the existing technology Compensated Bus Interface Converter Control Method
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[0016] A bus interface converter control method for uniform compensation of AC unbalanced voltage and DC pulsating voltage. The main circuit of the hybrid microgrid includes a bidirectional interface converter, an AC microgrid, and a DC microgrid. The bidirectional interface converter includes a three-phase full-bridge circuit and a DC microgrid. Boost chopper circuit, in which the three-phase full-bridge circuit includes three groups of bridge arms connected in parallel, each group of bridge arms includes two IGBTs connected in series, the IGBT is composed of a power tube and an anti-parallel diode, the three-phase full-bridge circuit The DC capacitor is connected in parallel on both sides of the bridge arm of the full bridge circuit, the AC side is filtered by the inductor L, and the boost chopper circuit is a fluctuating power compensation circuit, including the inductor L ac , capacitance C ac And a group of bridge arms composed of IGBTs connected in series, the inductance...
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The invention relates to the field of alternating current and direct current hybrid microgrid bus interface converter control and electric energy quality management, particularly to a bus interface converter control method for unified compensation of alternating current unbalanced voltage and direct current pulsating voltage. According to the invention, the problem of different voltage qualities caused by coupling of double-frequency fluctuation powers between alternating current and direct current subnets under the condition of unbalanced voltage is effectively solved; a main circuit consistsof an alternating current subnet, a direct current subnet and a bidirectional interface converter for connecting the two subnets, a control circuit is composed of an alternating current part and a direct current part, an alternating current side controls the converter through bidirectional power flow and a proportional resonance algorithm, and compensates a negative sequence voltage by using thepower margin transmitted by the converter, a boost chopper circuit is introduced into a direct current side, and a direct current bus pulsating voltage is stabilized through a power compensation principle; and by controlling a bus interface converter, the purpose of simultaneously compensating alternating current and direct current voltages is achieved, the utilization rate of the bidirectional interface converter is improved, and the reliability of microgrid operation is guaranteed.
Description
technical field [0001] The invention relates to the field of hybrid micro-grid AC-DC bus interface converter control and hybrid micro-grid power quality management, and specifically refers to a bus interface converter control method for unified compensation of AC unbalanced voltage and DC pulsating voltage. Background technique [0002] As the penetration rate of new energy continues to increase, AC-DC hybrid microgrids have gradually become the future development trend of microgrids because they can effectively combine the respective advantages of AC microgrids and DC microgrids. The actual AC / DC hybrid microgrid is often located at the end of the distribution network and its own capacity is relatively small. When an asymmetric fault occurs in the large power grid or the load is unbalanced, negative sequence components will appear in the grid voltage, current or load voltage and current. As a result, the voltage at PCC is unbalanced, which further causes DC voltage pulsatio...
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Login to View More IPC IPC(8): H02J4/00H02J3/18H02M7/797
CPCH02J4/00H02J3/1842H02M7/797Y02E40/30Y02E40/50
Inventor 任春光赵多贾燕冰韩肖清孟润泉王磊孔健生郭东鑫
Owner TAIYUAN UNIV OF TECH