考虑出力与电价不确定性的光伏集群有功功率分配方法

doi:10.11930/j.issn.1004-9649.202304042

摘要/Abstract

摘要：

针对配网高渗透率光伏集群经济运行以及参与系统功率调整问题，提出一种区域光伏集群的有功功率优化调度分配方法。首先，将集群内部光伏站按照储能配置与受控能力进行分类；以多场景法将光伏出力、市场电价不确定性问题转化为确定性场景，引入条件风险价值量化不确定风险；建立区域光伏集群功率分配优化模型，以集群运行成本最小为优化目标，求解最优的日前出力计划与储能运行策略；最后，针对系统扰动导致运行方式改变，提出光伏集群参与系统调整的功率重新分配策略。算例结果表明区域光伏集群具有参与系统功率调整能力，验证了本文方法的有效性。

关键词: 区域光伏集群, 有功分配策略, 不确定性, 场景法, 功率重新分配

Abstract:

Aiming at the economic operation of high permeability photovoltaic (PV) cluster in distribution network and its participation in system power adjustment, an active power optimal scheduling allocation method for regional PV cluster is proposed. Firstly, the PV stations in the cluster are classified according to their energy storage configuration and controllable capacity. The multi-scenario method is used to transform the uncertainty of PV output and market price into a deterministic scenario. The conditional value-at-risk (CVaR) is introduced to quantify the uncertainty risk, and a regional PV cluster power allocation optimization model is established. Taking the minimum operating cost of the cluster as the optimization objective, the optimal day-ahead output plan and energy storage operation strategy are obtained. Finally, aiming at the operation mode change caused by the system disturbance, a power redistribution strategy for PV cluster participating in system adjustment is proposed. The results of the case study show that the regional PV cluster has the ability to participate in the system power adjustment and the proposed method is also proved to be effective.

Key words: regional photovoltaic cluster, active power distribution strategy, uncertainty, scenario method, power redistribution

李华, 程子月, 李旭东, 李振兴, 牛志雷, 陈斌, 王扬赜. 考虑出力与电价不确定性的光伏集群有功功率分配方法[J]. 中国电力, 2023, 56(10): 211-218.

Hua LI, Ziyue CHENG, Xudong LI, Zhenxing LI, Zhilei NIU, Bin CHEN, Yangze WANG. Active Power Allocation Method for Photovoltaic Cluster Considering Output and Electricity Price Uncertainty[J]. Electric Power, 2023, 56(10): 211-218.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202304042

https://www.electricpower.com.cn/CN/Y2023/V56/I10/211

图/表 9

图 1 区域光伏集群示意

Fig.1 Regional PV cluster schematic

图 2 配网区域光伏集群功率分配模式

Fig.2 Power distribution mode ofdistribution network regional PV cluster

图 3 典型光伏出力与用户负荷

Fig.3 Typical PV output and user load

表 1 光伏出力与电价场景概率

Table 1 PV output and electricity price scenario probability

场景	光伏出力	电价
一	0.20	0.27
二	0.30	0.45
三	0.50	0.28

图 4 区域光伏集群典型运行场景

Fig.4 Typical operation scenarios of regional PV cluster

表 2 不同置信度下的运行成本与风险成本

Table 2 Operating costs and risk costs under different confidence levels

置信度	运行成本/元	风险成本/元
0.80	101967.30	14173.17
0.85	103538.79	11934.46
0.90	104216.51	9732.93
0.95	105283.40	7085.50

图 5 增出力场景功率重新分配

Fig.5 Power redistribution under output increase scenario

图 6 备用容量投入前、后集群与系统交换功率

Fig.6 Power exchange between cluster and system before and after standby capacity is put into operation

图 7 减出力场景下集群与系统交换功率

Fig.7 Power exchange between cluster and systemunder output reduction scenario

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