考虑气电联合需求响应的气电综合能源配网系统协调优化运行

Coordinated Optimal Operation of Electricity and Natural Gas Distribution System Considering Integrated Electricity-gas Demand Response

在未来多能互补、综合能源系统的背景下,传统配电网和配气网独立调度运行的模式已经不能满足多种能源互补的运行要求。为此,该文提出气电综合能源配网系统最优潮流的凸优化方法,即利用二阶锥规划方法对配电网潮流方程约束进行处理,并提出运用增强二阶锥规划与泰勒级数展开相结合的方法对天然气潮流方程约束进行处理,进而将非线性的气电综合能源配网系统优化调度问题转化为混合整数二阶锥规划模型,为气电综合能源配网的气/电协调优化运行和规划设计提供支撑。同时在配网系统中引入气电联合需求响应来提高系统调度的可控性和灵活性,从而更好的消纳新能源,以达到配网系统的优化运行。仿真结果表明,运用增强二阶锥规划与泰勒级数展开相结合的方法能更好提高配气网的二阶锥松弛精度,且考虑气电联合需求响应能够提高综合能源配网系统运行的经济性和新能源的消纳能力。

Under the background of multi-energy complementary and integrated energy systems in the future, the traditional mode of independent dispatching operation of the electricity distribution network and gas distribution network can no longer meet the requirements of multiple energy complementary operations. In order to solve this problem, a convex optimization method for optimal power flow of coordinated electricity and natural gas distribution networks is proposed, that is, the second-order cone programming method is used to deal with the power flow equation constraints of the electricity distribution network, and a method combining enhanced second-order cone programming and Taylor series expansion(TSE) is used to constrain the natural gas power flow equation. After reformulation, the nonlinear optimal scheduling problem of the integrated electricity and natural gas distribution system is transformed into a mixed integer second-order cone programming model, which provides support for gas/electricity coordinated optimal operation and planning of integrated electricity and natural gas distribution network. At the same time, integrated electricity-gas demand response was introduced into the distribution system to improve the controllability and flexibility of the system dispatch, thereby better consuming renewable energy to achieve the optimal operation of the distribution network system. The case study shows that the combined method of enhanced second-order cone programming and TSE can better improve the second-order cone relaxation accuracy of the gas distribution network, and the integrated electricity-gas demand response can improve the economics of the distribution system operation and the accommodation of renewable energy.