基于电子电力变压器的配电网电压无功综合优化控制  

Voltage and reactive power synthetic optimization in the distribution system based on electronic power transformer

作　　者：崔艳艳[1] 毛承雄[1] 陆继明[1] 王丹[1] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《继电器》2006年第6期24-28,43,共6页Relay

基　　金：新世纪优秀人才支持计划资助

摘　　要：将电子电力变压器EPT(E lectron ic Power Transform er)用于配电网,进行电压无功综合优化控制。电子电力变压器具有如下优点:可以发出和吸收无功,具有高度可控性;可以始终保持副方输出电压幅值恒定,不随负载变化且平滑可调;原方功率因数可调等等,这些都是常规的有载调压变压器(OLTC)所不具有的。但是,与常规OLTC的仿真研究不同,在含EPT的配电网无功优化中,遗传算法输出的控制变量是EPT原副方VSC的PWM调制系数和调制相角。另外,为了提高优化速度,文中还对简单遗传算法做了改进,改善了算法的收敛特性。算例分析表明,EPT取代配电网中常规的OLTC可有效降低网损,改善副方电压质量,大大减少无功补偿设备的投资费用,从而更好地满足用户对电能质量的要求。This paper applies Electronic Power Transformer （EPT） into the distribution network to optimize and control the voltage and reactive power synthetically. EPT is superior to DLTC with the advantages of high controllability to generate or absorb reactive power, keeping output voltage of secondary side constant in amplitude regardless of load changing, and being adjusted continuously and power factor of primary and secondary side of EPT are adjustable. However, different from conventional OLTC, during the reactive power optimization including EPT, genetic algorithm outputs control variables which are PWM modulation coefficients and phase angles of the primary and secondary VSC of EPT. In order to improve the speed of the optimization, this paper has improved simple GA to ultimately improve the convergence property of the algorithm. Analysis of test example indicates EPT in place of traditional OLTC in the distribution networks can lower power loss effectively, improve voltage quality of distribution networks and reduce the expense of the reactive-load compensation equipment to better satisfy the need of the electric customer to power quality.

关 键 词：电子电力变压器 遗传算法 电压无功优化 配电网 

分 类 号：TM761.1[电气工程—电力系统及自动化]