市场环境下考虑降压节能调节的主动配电网运行优化策略

Optimal Operation Strategy for Active Distribution Company With Conservation Voltage Reduction in Competitive Electricity Markets

针对主动配电网参与市场购电,提出了同时考虑主动配电网运行安全性和经济性的优化运行模型。该模型考虑了市场电价和分布式电源出力的不确定性,采用随机规划进行建模。为在随机规划模型中进一步考虑系统运行安全约束和离散控制措施,提出了线性化配电网潮流模型和基于虚拟电流注入法的线性有载调压变压器模型,使得主动配电网运行优化模型最终为线性规划模型,实现了在随机规划模型中有效考虑了主动配电网运行安全约束和有载调压变压器等离散控制措施。引入降压节能控制技术,使得主动配电网利用降压节能控制提高系统运行经济性。通过33节点主动配电网算例分析,验证了所提模型和方法的有效性和合理性。

This paper proposes a short-term trading model for an active distribution network（ADN） as a price-taker to participate in electricity markets to maximize its profits. Trading model is constructed based on a two-stage stochastic programming framework to represent the trading in day-ahead market and balance market and uncertainties pertaining to market prices and distributed generations（DGs）. Conservation voltage reduction（CVR） is introduced to assist ADN to decrease electricity purchasing cost especially when market price is much higher than selling price for ADN customers. Besides, a novel linear optimal operation model of distribution network and a fictitious injected current based on-load tap changer linear model are developed and integrated into the stochastic programming framework to well address network securities of voltage violations. The proposed model makes the stochastic trading model highly practical for industrial utilizations, since formulated as a linear programming（LP） model, it can be efficiently solved with commercial software without resulting in further numerical troubles. Case studies demonstrate effectiveness of the proposed ADN model on security enhancement and operation revenue increase.