Coordinated Control Method for Low-Voltage Distribution Networks with High-Penetration Residential Photovoltaic

doi:10.11930/j.issn.1004-9649.202410039

Abstract

Abstract:

With the continuous increase in the penetration rate of residential photovoltaic (PV), voltage regulation in low-voltage (LV) distribution networks has attracted growing attention. To address the voltage regulation requirements across different time scales, a coordinated control method for LV distribution networks with high-penetration residential PV is proposed. First, aiming at minimizing network losses and voltage deviation, a day-ahead and intra-day centralized optimization control model is established to determine the operational setpoints for voltage regulation resources. Then, the optimized results for residential PV systems are applied in the real-time control stage, and an adaptive control strategy for residential PV is improved to dynamically adjust the output power based on node voltage measurements. Finally, simulation analysis on a 21-node LV distribution network demonstrates that the proposed method significantly improves network losses and voltage profiles, effectively suppresses voltage violations, and ensures the secure and stable operation of the distribution network.

Key words: residential photovoltaic, low-voltage distribution network, voltage regulation, centralized optimization control, adaptive control

LIAO Jiaqi, YU Ruoying, YE Rongbo, XIONG Junjie, XIA Junrong. Coordinated Control Method for Low-Voltage Distribution Networks with High-Penetration Residential Photovoltaic[J]. Electric Power, 2025, 58(10): 110-120, 135.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202410039

https://www.electricpower.com.cn/EN/Y2025/V58/I10/110

Figures/Tables 12

Fig.1 Multi-time scale operation control framework for residential PV in low-voltage distribution network

Fig.2 Improved voltage-reactive power control curves of residential PV

Fig.3 Topology of 21-node low-voltage distribution network

Table 1 Residential PV installed capacity and adjustable-type data

节点号	额定发电功率/kW	额定装机容量/(kV·A)	无功功率可调	有功功率可调	有功功率调节比例
4	24	25.3	√	×
8	25	26.3	√	√	0.4
10	25	26.3	√	×
11	18	18.9	√	√	0.4
12	30	31.6	√	×
13	18	18.9	√	×
16	30	31.6	√	√	0.2
17	18	18.9	√	×
20	25	26.3	√	√	0.2

Fig.4 24-hour PV and load power curve

Fig.5 Voltage variation curves for node 18 in uncontrolled mode and COC mode

Fig.6 Voltage variation curves for node 18 in COC mode and CSDC mode with 5% prediction error

Fig.7 Voltage variation curves for node 18 in COC mode and CSDC mode with 10% prediction error

Fig.8 Voltage variation curves for node 18 in SLC mode and CSDC mode with 10% prediction error

Fig.9 Voltage variation curves for node 18 in VSLC mode and CSDC mode with 10% prediction error

Fig.10 Voltage variation curves for all nodes of low-voltage distribution network in CSDC mode with 10% prediction error

Table 2 Power loss of low voltage network under different control modes

控制模式	网络损耗/(kW·h)
控制模式	5%误差	10%误差
无控制	108.6	109.2
COC	121.4	121.8
SLC	156.7	157.4
VSLC	160.1	159.2
CSDC	129.7	129.6

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