电-气多能源微网能流差异化求解

Differentiated solution for energy flow of electric-gas multi-energy microgrid

多能源微网可实现配网/用户侧的多能源互联,是实现能源利用提质增效的重要切入点。本文针对多能源微网中EH运行模式的多样性,及电力网络与天然气网络能流特性的差异,提出一种电-气多能源微网能流差异化求解方法:分解求解电力网络与天然气网络,基于解析函数递推求解电力网络能流,采用线性逼近法求解天然气网络能流。对EH进行节点类型处理,建立其能流计算模型;求解电力网络时,构造电力节点的解析函数方程,将未知变量的解析函数表示成幂级数,递推求解出其有限项幂级数的系数,再构造有限项幂级数的Padé近似式判断解的可行性。对电-气多能源微网算例系统采用所提方法进行能流计算,验证其正确性和有效性。

Multi-energy interconnection on the distribution network/user side can be realized by multi-energy microgrid,which is an important entry point for achieving energy utilization improvement and efficiency improvement.Aiming at the diversity of EH operation modes in the multi-energy microgrid and the energy flow characteristics difference of the power network and the natural gas network,an energy flow differentiated solution method for electric-gas multi-energy microgrid is developed in this paper.It solves the power network and natural gas network based on decoupling,and recursively solves the energy flow of the power network based on the analytical function,and uses the linear approximation method to solve the energy flow of the natural gas network.The node types of EH are processed and its energy flow calculation model is established.When solving the power network,the analytical function equation of the power node is constructed,and the analytic function of the unknown variable as a power series is expressed,and the finite term power series coefficients is recursively solved,then the Padéapproximation of the finite term power series are constructed to judge the feasibility of the solution.Finally,correctness and effectiveness of the proposed method are verified with the energy flow calculation of electricity-gas multi-energy microgrid example system.