Research on Key Characteristics of Optical-Storage Bidirectional Converter Based on Virtual Synchronous Generator Technology

doi:10.11985/2018.07.006

Abstract

Abstract:

The topology and working principle of the optical-storage bidirectional converter based on virtual synchronous generator technology is introduced, the small signal model modeling based on the control strategy of virtual synchronous generator is carried out, the design method of key parameters of virtual inertia, active frequency and reactive voltage control is given, and the influence of these parameters on the performance of the device is analyzed. Finally, for the prototype of 30kW virtual synchronous generator integrated with optical and storage, PSACD / EMTDC simulation results and hardware experiment results are used to verify the effectiveness of the control strategy and parameter design.

Key words: Virtual synchronous generator, P-f control, inertia control, parameter influence

CLC Number:

TM615

Tao Hongfei,Sun Lijing,Cui Jian,Yang Caiming,Jin Yuanwen,Xie Dong. Research on Key Characteristics of Optical-Storage Bidirectional Converter Based on Virtual Synchronous Generator Technology[J]. Journal of Electrical Engineering, 2018, 13(7): 40-48.

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参数	取值	参数	取值
额定容量/kV·A	10	滤波电感L₂/mH	3
直流电压/V	700	网侧电感L₃/mH	1
直流侧电容/μF	1 000	滤波电容/μF	10
电网相电压/V	220	—	—

参数	有功环		无功环
参数	D_p	J	D_q	K
取值范围	0~5	0~0.1	0~321	0~8

技术参数	技术指标
直流最大输入电压/V	1 000
直流电压范围/V	200~1 000
直流最大输入功率/kW	37.5
直流最大输入电流/A	34
交流额定工作电压	380V,三相三线
交流电压范围/V	300~400
交流额定输出电流/A	45
储能配置	10kW、0.5h
直流滤波电感L₁/mH	1
直流侧电容C₁/μF	100
交流侧电感L₂/mH	1.5
直流侧电容C₂/μF	10
交流侧电感L₃/mH	0.1
有功环下垂系数D_p	5
无功环下垂系数D_q	1
有功环惯性系数J	0.1
无功环惯性系数K	7

	f/Hz	响应时间t_r/s	调节时间t_s/s	误差/kW
轻载	48.5	0.50	1.0	0.55
轻载	50.4	0.25	1.0	0.30
重载	48.5	0.50	0.9	0.50
重载	50.4	0.20	1.0	0.20