摘要
光伏发电系统通常运行于最大功率点,难以在紧急条件下为电网提供功率支撑。受制于建设和运行成本,储能的大规模应用还难以实现,同步发电机占比的降低使得含高比例光伏发电的电网安全风险不断增加。为此,分析了光伏发电系统的功率特性和稳定运行条件,提出了通过光伏减载运行预留备用功率从而为电网提供紧急功率支撑的思想。进而分析了协议发电成本和风险成本的关系,建立了以同步发电机启停机计划、备用容量和光伏减载量为决策变量的两阶段降风险发电调度优化模型。提出了考虑光伏减载运行的电力系统降风险优化调度方法。最后利用IEEE RTS 24节点系统验证了方法的正确性。算例分析表明,该方法能够在降低电网功率不平衡风险的前提下获得最优的经济性,具有较好的实用性。
Photovoltaic(PV)power generation systems usually operate at the maximum power point,and it is difficult for them to provide power support for the grid under emergency conditions.Constrained by construction and operating costs,large-scale applications of energy storage systems are still difficult to achieve.The reduction in the proportion of Synchronous Generators(SG)has increased the security risks of power grids with a high proportion of PV power generation.The power characteristics and stable operating conditions of a PV power generation system are analyzed,and a control principle based on PV power reserve is proposed to provide emergency power support for the grid.The relationship between the agreed power generation cost and the risk cost is analyzed.A two-stage risk reduction power generation optimization scheduling method is established with a start-up and shutdown plan of SG,reserve capacity and PV power reserve as decision variables.A power system risk reduction optimization scheduling method taking into account the PV power reserve is proposed.Finally,the correctness of the proposed method is validated on the IEEE RTS 24-node system.The case study demonstrates that the proposed method is the most economical when reducing the risk of power imbalance in the power grid and has good practicability.
作者
钟璐
熊俊
张茜
杨哲涵
欧阳金鑫
熊小伏
ZHONG Lu;XIONG Jun;ZHANG Xi;YANG Zhehan;OUYANG Jinxin;XIONG Xiaofu(State Grid Southwest Division,Chengdu 610041,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)
出处
《电力系统保护与控制》
CSCD
北大核心
2021年第14期157-167,共11页
Power System Protection and Control
基金
国家电网公司科技项目资助(SGSW0000DKJS1900097)“藏中-川藏联网的气象风险辨识与西南电网降风险调度辅助决策研究”
国家自然科学基金委员会-国网电网公司智能电网联合基金项目资助(U1866603)。
关键词
光伏发电系统
紧急控制
降风险控制
光伏减载运行
优化调度
photovoltaic power generation system
power system emergency control
risk reduction control
photovoltaic power reserve
optimization scheduling
