Droop Control Strategy of Distributed Photovoltaic Reactive Power Considering Probability Distribution

doi:10.12096/j.2096-4528.pgt.22172

Abstract

Abstract:

Distributed photovoltaic access to the distribution network has gradually become a trend, but the large-scale distributed photovoltaic grid connection will cause serious power flow reversal, resulting in out-of-limit voltage and network loss increase. Aiming at the out-of-limit voltage problem generated by distributed photovoltaic access to distribution network, a distributed photovoltaic reactive power droop control strategy considering the probability distribution was proposed. Firstly, the influence of probability distribution of photovoltaic output on the current active power of different photovoltaic units of photovoltaic power plants was considered, and the available reactive capacity of each photovoltaic inverter was evaluated and calculated. Then, the reactive power droop coefficient was adjusted according to the current available reactive capacity of each photovoltaic unit, and the reactive power support capacity of the photovoltaic power station was maximized without sacrificing active power. Finally, the effectiveness of the proposed control strategy was verified by PSCAD/EMTDC simulation software.

Key words: distributed photovoltaic, out-of-limit voltage, photovoltaic probability distribution, reactive power and voltage control, droop control

CLC Number:

TK 51

Yiwei QIAN, Hao TIAN, Caihua LIU, Xinze TIAN, Xia ZHOU, Jianfeng DAI. Droop Control Strategy of Distributed Photovoltaic Reactive Power Considering Probability Distribution[J]. Power Generation Technology, 2024, 45(2): 273-281.

Figures/Tables 13

Fig. 1 Distributed photovoltaic grid-connected equivalent circuit

Fig. 2 Traditional droop control curve

Fig. 3 Traditional droop control principle

Fig. 4 Probability density curve of the photovoltaic output active

Fig. 5 Improved droop control principle

Fig. 6 Droop gain probability density for different light intensity zones

Fig. 7 IEEE33 node network configuration topology

Tab. 1 Droop gains and reactive capacities of different nodes

参数	节点5	节点10	节点15	节点20	节点23	节点30
下垂增益	11.2	11.2	32.4	32.4	49.8	49.8
无功容量	0.22	0.22	0.70	0.70	0.95	0.95

Fig. 8 Distribution and connection point voltage

Fig. 9 Total photovoltaic output and load curve within 24 h of the system

Fig. 10 Voltage change of the photovoltaic access node when it is not controlled

Fig. 11 Voltage change of the photovoltaic access point after the proposed control strategy is adopted

Fig. 12 Droop gain of proposed control strategy

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