计及特高压直流外送及转运合同约束的日前优化调度

Day-ahead optimal scheduling considering the constraints of UHVDC transmission and wheeling contracts

分析特高压直流输电的运行特性、转运合同对电网运行调度的影响,建立计及特高压直流外送和子电网间转运合同约束的日前优化调度模型。以电网运行成本最小和弃风弃光最少为目标,同时考虑交直流线路的外送和转运电量约束,通过增加表征功率调节的功率上调和功率下调两类0-1变量,将特高压直流输电线路的阶梯化约束表述为0-1混合整数的线性方程。以改进的IEEE 39节点系统为例,分析特高压直流外送及转运合同对电网可再生能源消纳的影响,验证了本研究所提方法的有效性。

The operational characteristics of ultra-high voltage direct current(UHVDC) transmission and the impact of wheeling contracts on power grid operation and dispatching were analyzed, and a grid-optimized dispatching model considered the constraints of UHVDC transmission and inter-subnet wheeling contracts was established. The model aimed at the minimum operating cost of the power grid and the minimum of wind and photovoltaic curtailment, at the same time, the power constraints of the transmission and wheeling of AC and DC lines were considered, by adding two types of 0-1 variables that characterize power regulation, power up and power down, the stepped constraints of UHVDC transmission lines were expressed as linear equations of 0-1 mixed integers. Taking the improved IEEE39 node system as an example, the impact of UHVDC transmission and wheeling contracts on the grid′s renewable energy consumption was analyzed, and the effectiveness of the proposed method was verified.