考虑分布式光伏和储能参与的配电网电压分层控制方法
CSTR:
作者:
作者单位:

(1.国网湖北省电力有限公司随州供电公司,湖北 随州 441300;2.湖南大学电气与信息工程学院,湖南 长沙 410082;3.江西迪比科股份有限公司,江西 抚州 344000)

通讯作者:

张明敏(1991—),男,博士,助理研究员,主要从事电能质量分析与控制研究;E?mail:mmzhang1991@hnu.edu.cn

中图分类号:

TM863

基金项目:

国网湖北省电力有限公司科技项目(B315M021000A);湖南省自然科学基金(2022JJ50001)


Voltage hierarchical control method of distribution network considering distributed photovoltaic and energy storage
Author:
Affiliation:

(1.Suizhou Power Supply Company, State Grid Hubei Electric Power Co., Ltd., Suizhou 441300, China; 2.College of Electrical and Information Engineering, Hunan University, Changsha 410082, China; 3. Jiangxi DBK Co., Ltd., Fuzhou 344000, China)

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    摘要:

    提出一种考虑分布式光伏无功和储能有功参与的配电网电压分层控制方法。首先,分析了由分布式光伏与负荷时空不匹配引起的高/低电压问题,依据配电网拓扑以及线路参数计算得到配电网节点电压与注入功率的无功-电压、有功-电压近似灵敏度矩阵。其次,在第一层控制中,提出了分布式光伏参与配电网调压的无功-电压下垂系数优化控制方法,通过求解电压优化模型得到分布式光伏逆变器的最优下垂系数,从而计算出其无功输出。当光伏逆变器的无功容量不足时,提出了第二层控制,即储能参与调压的有功-电压自适应下垂控制策略,储能逆变器的下垂控制系数根据储能荷电状态(state of charge,SOC)与所在节点电压自适应调整,既考虑了储能的容量,又实现了储能功率和SOC的相对均衡控制。最后,以一实际10节点配电网系统作为算例验证了所提方法的有效性。

    Abstract:

    In recent years, the penetration rate of distributed photovoltaic (PV) in the distribution network has been continually increasing. When the output of PV and load are not matched, the voltage of the distribution network will easily exceed the limit, which will affect the safe and stable operation of the distribution network. In this paper, a voltage hierarchical control method for distribution network is proposed considering the participation of distributed PV’s reactive power and energy storage’s active power. First, the high/low voltage problem caused by the spatio?temporal mismatch between distributed PV and load is analyzed. Based on the distribution network topology and line parameters, the reactive power?voltage and active power?voltage approximate sensitivity matrices of the node voltage and injected power in the distribution network are calculated. Second, in the first layer of control, and a reactive power?voltage droop coefficient optimization control method is proposed for distributed PV to participate in voltage regulation. The optimal droop coefficient of distributed PV inverter is obtained by solving the voltage optimization model, then the reactive power output can be calculated correspondingly. When the reactive capacity of the PV inverter is insufficient, the second layer of control is proposed, that is, the active?voltage adaptive droop control strategy in which energy storage can participate in voltage regulation. The droop control coefficient of the energy storage is adjusted adaptively according to the state of charge (SOC) of energy storage and the local bus voltage, and the capacity of energy storage is also considered. In this way, the relative balance of energy storage power and SOC can be realized. Finally, a real 10?bus distribution network is used as an example to verify the effectiveness of the proposed method.

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杨婧颖,王武林,张明敏,等.考虑分布式光伏和储能参与的配电网电压分层控制方法[J].电力科学与技术学报,2023,38(5):111-120,215.
YANG Jingying, WANG Wulin, ZHANG Mingmin, et al. Voltage hierarchical control method of distribution network considering distributed photovoltaic and energy storage[J]. Journal of Electric Power Science and Technology,2023,38(5):111-120,215.

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