Research on Control Strategy of DC Microgrid Interface Converter

doi:10.11985/2016.10.004

Abstract

Abstract:

A mathematical model of DC microgrid interface converter is built in the dq-frame coordinate system, according to its operation characteristic. By analyzing three control strategies of power controller separately, a novel design method of power controller is proposed with DC voltage-active power droop control. Based on the presented control strategy, a two-way grid-connected interface control is realized, and a controlled sinusoidal current is obtained with few harmonic and unit power factor. Meanwhile, DC bus voltage can be kept stable. An electromagnetic transient simulation model is built in PSCAD/EMTDC, and the effectiveness of the new grid-connected interface control strategy is validated. Results show that the proposed control strategy is accurate and feasible.

Key words: DC microgrid, voltage source converter, grid interface, droop control

CLC Number:

TM727

Hui Li,Qi Luo,Xinqiao Fan. Research on Control Strategy of DC Microgrid Interface Converter[J]. Journal of Electrical Engineering, 2016, 11(10): 19-23.

Figures/Tables 7

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参数	数值	参数	数值
直流母线电压/V	800	锁相环k_p	900
交流电源线电压/V	380	锁相环k_i	1 900
电网频率/Hz	50	PI功率调节器k_p	20
直流电源内阻/Ω	0.01	PI功率调节器k_i	40
交流侧等效电阻/Ω	0.55	PI电流调节器k_p	20
交流侧等效电感/mH	0.5	PI电流调节器k_i	400
滤波电感/mH	5	下垂控制系数k_droop	0.5