), 严佳嘉, 谢敬东, 孙波 上海电力大学 电气工程学院,上海 200090
收稿日期:2021-07-01出版日期:2021-12-28发布日期:2021-12-30作者简介:孙 欣(1980-),女,江苏省镇江市人,副教授,主要从事电力市场、综合能源系统优化研究.电话(Tel.): 021-35303874;E-mail: 基金资助:国家自然科学基金(U2066214)Coordinated Optimization Model of Active Power and Reactive Power in Power and Gas Systems with the Objective of Carbon Neutrality
SUN Xin(), YAN Jiajia, XIE Jingdong, SUN Bo College of Electrical Engineering, Shanghai University of Electrical Power, Shanghai 200090, China
Received:2021-07-01Online:2021-12-28Published:2021-12-30摘要/Abstract
摘要： 随着碳中和目标的提出,新能源机组逐步成为主力电源,其波动性给系统特别是配电网的控制和优化带来了巨大的挑战.为了解决高比例可再生能源接入配网带来的无功问题,提出一种计及无功优化和多能协同交互的源-网-荷-储集中优化调度模型.该模型以多能系统运行成本最优、网络损耗最小、碳排放量最小为目标,考虑无功补偿、储能调节以及能量转换等手段,以实现电气互联系统的安全低碳经济调度.采用改进二阶锥松弛法对配网模型中非线性等式约束进行凸松弛,采用大M法对离散无功补偿装置的投切容量进行线性化表达,将模型转换为混合整数二阶锥规划问题进行求解.仿真结果表明,所提方法能够有效补偿风机并网点所需无功,协调电、气之间的能量交互,从而提高大规模可再生能源接入后配网的稳定性与弹性,促进可再生能源消纳.
关键词: 有功-无功协同优化, 电气互联系统, 碳中和, 可再生能源, 改进二阶锥松弛
Abstract: With the objective of carbon neutrality, renewable energy resources gradually become the main power supply, whose variability poses great challenges to the operation and optimization of the system, especially to the power distribution network. In order to solve the problem of reactive power caused by high penetration of renewable energy sources, a centralized optimization model is proposed, which takes reactive power optimization and “generation-network-load-storage” multi-energy integration into account. The model aims at optimizing the operating cost and minimizing network losses and carbon emissions of the system. Reactive power compensation, regulation of energy storage, and energy conversion are considered to achieve safe and low-carbon economic dispatch of the power and gas systems. An improved second-order cone relaxation method is used for the convex relaxation of non-linear equality constraints concerned with the distribution network. The switching capacity produced by discrete reactive power compensators can be exactly linearized by the application of the big M approach. The simulation results demonstrate that the proposed method could effectively compensate the reactive power required by the grid-connection point of wind turbine, coordinate the energy interaction between the power and gas, thus improving the stability and elasticity of the distribution network after integration of large-scale renewable energy sources, which helps promote the consumption of renewable energy.
Key words: coordinated optimization of active power and reactive power, power and gas system, carbon neutrality, renewable energy sources, improved second-order cone relaxation
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