计入电力系统可靠性与购电风险的峰谷分时电价模型

A Peak-Valley TOU Price Model Considering Power System Reliability and Power Purchase Risk

在电力市场环境下,针对需求侧用户的多时段电价响应,基于电力供给与电力弹性需求平衡关系推导了峰谷分时电价下的电量电价弹性矩阵,以反映用户对电价变化的响应过程。在此基础上,以电网经营企业收益最大化为目标函数,计入可靠性约束、购电风险和线路损耗等,建立了峰谷分时电价模型。该模型通过分时电价的调节即可达到提高电网供电可靠性、减少停电损失,同时增加电网经营企业收益、降低购电风险的目的,使用户和电网经营企业达到双赢。为提高模型求解过程中可靠性指标的更新速度,进一步研究了电力系统可靠性随负荷变化的三次样条插值模型。以IEEE-RTS 79测试系统为例进行算例分析,验证了上述模型、算法的正确性和有效性,并进一步分析了峰谷分时电价下负荷曲线的改善效果及用户停电损失、电网经营企业收益的变化情况。

Under the environment of power market, according the customers＇ demand response to multi interval electricity prices and based on the equilibrium relationship between power supply and its elastic demand a price elasticity matrix under peak-valley time-of-use（TOU） price is derived to reflect consumers＇ response to the variation of electricity price. On this basis, taking the maximized revenue of grid corporation as objective function and considering the constraint of reliability, power purchase risk, network loss and so on, a peak-valley TOU price model is built. Through adjusting TOU price, the built model can achieve following aims such as improving power supply reliability of power grid, reduce outage cost, increasing the revenue of power grid corporation and decreasing the power purchase risk, thus a win-win situation of consumers and grid corporation can be attained. To accelerate the update rate of reliability index during the solution of the built model, a cubic spline interpolation model is established to describe power grid reliability varying with load level. To validate the correctness and effectiveness of above-mentioned models, simulation of IEEE RTS –79 is carried out, and the improved effect of load curve under peak-valley TOU price as well as the outage cost and variation of power grid corporation are further analyzed.