并网光伏电站关口无功调节能力的分时段等值方法

doi:10.11930/j.issn.1004-9649.202303049

摘要/Abstract

摘要：

现有并网光伏电站关口无功调节能力等值方法未考虑站内电压安全约束、并网点电压和光伏出力的波动影响，难以满足工程实际的调控管理要求，为此，提出一种并网光伏电站关口无功调节能力的分时段等值方法，为工程实际调控管理提供决策依据。在给定关口电压和光伏出力的条件下，考虑光伏电站内部静止无功发生器、光伏单元无功调节能力及其无功调节上下限要求，提出光伏电站关口无功最大调节范围的优化等值方法，确定光伏电站关口无功调节能力与其有功出力、关口电压的关系；同时，考虑关口电压和光伏出力波动的时段特性，通过相似日波动阈值的区域图时段融合策略，实现光伏电站关口无功调节能力的分时段等值。以实际光伏电站的仿真分析验证了所提方法的有效性。

关键词: 光伏电站, 无功调节能力, 分时段等值, 无功优化

Abstract:

The existing equivalent methods for reactive power regulation capacity of grid-connected photovoltaic(PV) plant do not take into account the voltage security constraints in the plant and the impacts of random fluctuations of grid-connected voltage and photovoltaic output, which makes it hard to meet the requirements of actual engineering. For this reason, a time-based equivalent method for reactive power regulation capacity of grid-connected PV plant is proposed, which can provide an effective decision-making basis for actual engineering management. Firstly, under the given gate voltage and PV output, and with consideration of the static var generator within the PV plant, the reactive power regulation capacity of the PV unit and the upper & lower limits of the reactive power regulation range, an optimal equivalent method for maximum gate reactive power regulation capacity of PV plant is proposed to determine the relationship between the gate reactive power regulation capacity of the PV plant and its active output and gate voltage. Secondly, considering the time period characteristics of the gate voltage and PV output fluctuations, the time-based equivalent scheme for reactive power regulation capacity of PV station is realized through the time period fusion strategy for fluctuation thresholds of similar days. Finally, the simulation analysis of an actual PV plant verified the effectiveness of the proposed method.

Key words: photovoltaic power plant, reactive power regulation capacity, time-based equivalent scheme, reactive power optimization

覃海, 陈胜, 张洪略, 夏天, 马覃峰, 段展宇, 颜伟. 并网光伏电站关口无功调节能力的分时段等值方法[J]. 中国电力, 2024, 57(2): 27-33.

Hai QIN, Sheng CHEN, Honglue ZHANG, Tian XIA, Qinfeng MA, Zhanyu DUAN, Wei YAN. Time-based Equivalent Method for Reactive Power Regulation Capacity of Grid-connected Photovoltaic Plant[J]. Electric Power, 2024, 57(2): 27-33.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202303049

https://www.electricpower.com.cn/CN/Y2024/V57/I2/27

图/表 7

图 1 光伏电站有功出力及接入点母线电压

Fig.1 Active power output of PV power plant and bus voltage at the access point

图 2 光伏电站无功出力限额9区表示

Fig.2 The reactive power output limit of PV plant expressed in 9 zones

表 1 算例相关参数设置

Table 1 Parameter settings of calculation examples

馈线电缆阻抗标幺值		箱变的阻抗标幺值		节点电压安全范围标幺值
0.13+j0.28		1.044+j5.71		1.00~1.08

图 3 最大输出无功能力

Fig.3 Maximum reactive power capacity

图 4 最小输出无功能力

Fig.4 Minimum reactive power capacity

表 2 各区段光伏电站无功出力限额

Table 2 Reactive power output limit of PV power plant in each section

区段编号	U_s(p.u.)	P_PV(p.u.)	Q_max/(MV·A)	Q_min/(MV·A)
1	＜1.04	0~0.1	11.39	–4.07
2	1.04~1.06	0~0.1	8.41	–10.07
3	1.06~1.08	0~0.1	5.24	–13.65
4	＞1.08	0~0.1	0	0
5	＜1.04	0.1~0.4	10.22	–4.78
6	1.04~1.06	0.1~0.4	7.20	–10.81
7	1.06~1.08	0.1~0.4	4.08	–14.39
8	＞1.08	0.1~0.4	0	0
9	＜1.04	0.4~0.7	8.63	–5.98
10	1.04~1.06	0.4~0.7	5.58	–12.28
11	1.06~1.08	0.4~0.7	2.48	–15.88
12	＞1.08	0.4~0.7	0	0
13	＜1.04	0.7~1	6.65	–7.91
14	1.04~1.06	0.7~1	3.65	–14.21
15	1.06~1.08	0.7~1	0.52	–17.79
16	＞1.08	0.7~1	0	0

图 5 光伏电站无功出力能力计算结果

Fig.5 Calculation results of reactive power output capacity of PV power plant

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