新型孤岛微网主从控制策略研究

摘要/Abstract

摘要：

为降低传统主从控制中对主电源的依赖,提高微网功率调节能力,提出了采用对等控制的储能逆变器作为主电源,采用功率控制的分布式电源逆变器作为从电源的新型主从控制策略。搭建了光伏电池模型,设计了其接口变流器的控制策略,以保证光伏最大功率输出。给出了传统主从控制策略中主电源V/f及从电源PQ控制原理,并采用相角下垂控制对主电源控制方法进行改进,使储能逆变器共同作为主电源运行,最终形成新型主从控制策略。应用相角下垂控制有效克服了频率下垂控制频率偏差的问题。最后依据上海电气中央研究院微网一期工程搭建了微网仿真模型,在孤岛运行模式下进行传统主从控制和新型主从控制策略的对比仿真研究。结果表明,新型主从控制策略不仅可以保证微网稳定运行,而且相对于传统主从控制可有效降低对单台主电源的依赖,增强了微网的稳定性,同时提高了微网功率调节能力,更大范围平衡分布式电源和负载的波动。

关键词: 微网, 光伏电池, 新型主从控制, 下垂控制, 功率调节

Abstract:

To relieve the dependency on master sources of conventional master-slave control strategy and improve the system power adjustment ability, the novel master-slave control strategy is proposed. The droop control is used in the battery inverters which as the master sources and the power control is used in the distributed generation inverters which as the slave sources. The photovoltaic cell model is built and its converter is designed to ensure the maximum power output. The control block diagram of V/f and PQ control of the conventional master-slave control strategy is given and the angle droop control is adopted to improve the control effect. The angle deviation problem caused by frequency droop control is solved by using angle droop control. The simulation model is built and the comparison of conventional and novel master-slave control strategy is made. The results demonstrate that the novel control strategy maintains the stable operation of the microgrid system and effectively reduce the dependency on master sources. The proposed control strategy also enhances the power adjustment ability of the system to balance the larger fluctuation of distributed generations and loads.

Key words: Microgrid, photovoltaic cell, novel master-slave control strategy, droop control, power adjustment

中图分类号:

TM464
TM727

杜志超,欧阳丽,周春,胡娟. 新型孤岛微网主从控制策略研究[J]. 电气工程学报, 2015, 10(4): 53-61.

Du Zhichao,Ou yang Li,Zhou Chun,Hu Juan. Research on Novel Master-Slave Control Strategy of Islanded Microgrids[J]. Journal of Electrical Engineering, 2015, 10(4): 53-61.

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	参数	数值
光伏系统	N_p	11
	N_s	19
	I_ph/A	8.98
	R_s/Ω	0.889 2
	R_sh/Ω	415.4
	A	54
储能系统	L_G_i /mH	[3.20,2.40,1.92]
	m/(10^–4rad/kW)	[3.33,2.50,2.00]
	m^*/(10^–7rad/kW)	[3.33,2.50,2.00]
	n/ (10^–2V/kvar)	[6.67,5.00,4.00]
	n^*/ (10^–5V/kvar)	[6.67,5.00,4.00]