Damping Control Strategy for Three-Phase Grid-Connected Inverter to Reduce Voltage Imbalance

doi:10.3969/j.issn.1000-7229.2018.10.014

Abstract

Abstract: Single-phase and three-phase load coexist in low-voltage distribution network, which cause imbalance of three-phase voltages. This paper presents a damping control strategy for three-phase inverter to reduce voltage imbalance factor. On the basis of sequence component method, a mathematical model of power damping control strategy is established and the voltage imbalance suppression mechanism is analyzed. The weak coupling between the power output of the positive-sequence control strategy and the damping control strategy to reduce voltage imbalance is elucidated. Then an improved damping control strategy is proposed, which can simplify the control difficulty. Simulation analysis of the 10-node asymmetric network shows that the proposed control strategy of the inverter can output active power and reactive power. At the same time, the voltage imbalance of the network is reduced.

Key words: low voltage distribution network, three phase inverter, damping control strategy, voltage imbalance factor

CLC Number:

TM 732

DONG Lei，ZHANG Tao，CHEN Naishi，WEI Zechen. Damping Control Strategy for Three-Phase Grid-Connected Inverter to Reduce Voltage Imbalance[J]. Electric Power Construction, 2018, 39(10): 113-119.

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