作者:苏慧玲，杨世海，段梅梅，杨永标
Authors:SU Hui ling,YANG Shi hai,DUAN Mei mei,YANG Yong biao摘要:针对新能源大量接入背景下电力系统频率调节能力紧张、旋转备用不足的问题 ,提出一种“ 源网荷”协同的二次调频策略 。通过柔性直流输电(voltage source converter-high voltage direct current, VSC-HVDC) 系统将拥有丰富可控资源的电解铝工业电网与传统电力系统互联 ,建立考虑 VSC-HVDC 功率支援的两端互联系统二次调频模 型 。基于互联系统频率控制模型构建分布式架构 ,在两端设计模型预测控制器 ,控制器在本区域内进行优化控制 , 定期进行信息交互 ,主动调节电解铝负荷功耗进行需求响应 ,减轻由功率支援引起的送端系统功率不平衡 。最后以我国西部地区某工业电网的实际数据进行仿真验证了所提出策略的有效性 。结果表明 ,在大扰动场景下 ,所提出的策略可以将受端系统频率恢复时间缩短约 30% , 同时在调控过程中 ,送端系统频率偏差始终保持在 0. 05 Hz 以内 ,且电解铝负荷与 VSC-HVDC 系统参数始终处于安全范围内。
Abstract:In order to address the problem that increasing number of renewables result in a loss of frequency control capacity in power system, this paper proposes a secondary frequency control strategy coordinating resources from supply, network, and demand sides. The power system is connected with an industrial power grid via VSC-HVDC link, which develops a secondary frequency control model for the interconnected system considering the VSC-HVDC power support. Based on the developed model, a distributed architecture is adopted, which involves two MPC controllers respectively in the sending and receiving systems. The two controllers calculate optimal control signals of their own control area with periodic communication and aluminum smelter loads change their power consumption to reduce the power imbalance in the industrial power grid caused by the power support. The effectiveness of the proposed strategy was verified by simulation. The results show that the proposed strategy can shorten the frequency recovery time of the receiving power system under large disturbance scenarios by 30% , while during the regulation process, the frequency deviation of the sending system is always kept within 0. 05 Hz, and the parameters of the aluminum smelter load and VSC-HVDC system are always within the safe range.

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