Distributed photovoltaic-energy storage reactive power optimization method for distribution networks under cloud energy storage mode

doi:10.3969/j.issn.2097-0706.2024.06.006

Abstract

Abstract:

Aiming at the problems caused by the access of high-proportion distributed photovoltaic to distribution networks， such as power fluctuations， over-limit voltages， line overloads and excessive line losses， a distributed photovoltaic-energy storage reactive power optimization method for distribution networks taking cloud energy storage mode is proposed. The method takes reactive power compensation price mechanism to encourage cloud energy storage devices to participate in distribution network voltage regulation auxiliary services， and fully employs the voltage regulation capacities of distributed photovoltaic panels， static var compensators（SVCs）， shunt capacitors（SCs） and on-load tap changers（OLTCs）. Finally， taking the minimum operation cost and minimum voltage deviation of a distribution network as optimization objectives， an economic optimization model of the distribution network system based on the flexible multi- resources regulation of cloud energy storage devices is established. Simulation analysis shows that the participation of cloud energy storage in the joint optimization of active and reactive power is helpful to stabilize the voltage fluctuation of the distribution network， alleviate the voltage regulation pressure of the reactive power compensation device and reduce the line power loss， guaranteeing the safe and economic operation of the distribution network system.

Key words: distribution network, cloud energy storage, distributed photovoltaic, reactive power compensation, network operational cost, voltage deviation

CLC Number:

TK01

WANG Lin, KONG Xiaomin, ZHOU Zhongyu, LIU Jianping, WANG Xiaodong, ZHANG Ning. Distributed photovoltaic-energy storage reactive power optimization method for distribution networks under cloud energy storage mode[J]. Integrated Intelligent Energy, 2024, 46(6): 44-53.

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参数	数值
储能最大容量/（kW∙h）	1 000
储能最大功率/kW）	400
电池寿命周期/a	8
储能容量投资成本/[元·（kW∙h）^-1]	300
功率投资成本/（元·kW^-1）	100
储能功率年维护成本/（元·kW^-1）	72
每小时无功补偿价格/[元·（kV∙A）^-1]	0.2
功率因数上/下限	0.95/0.75

参数	OLTC	SC1	SC2	SC3	SVC
范围	0.95~1.05	0~0.50	0~0.75	0~0.35	0~0.60
步长	0.01	50.00	50.00	50.00	连续
挡位	±5	10	15	7	—

c₁	c₂	F_grid	D_u
0.3	0.7	33 131.53	0.234 24
0.4	0.6	33 121.77	0.389 79
0.5	0.5	33 044.17	0.422 81
0.6	0.4	32 951.69	0.514 04
0.7	0.3	32 956.81	0.656 42

成本类型	案例1	案例2	案例3
线路功率损耗	298.90	254.13	253.06
向上级电网购电	33 954.08	28 705.03	28 702.40
云储能充放电		2 619.47	2 619.72
云储能无功补偿			304.06
无功补偿装置调压	1 248.12	1 366.06	1 164.92
总成本	35 501.10	32 944.69	33 044.16

案例	平均电压偏差（标幺值）	改善率/%	线路损耗/kW	改善率/%
1	0.006 4		301.75
2	0.006 2	3.1	282.77	6.3
3	0.006 1	4.7	278.71	7.6