【摘要】 变电站电压无功控制系统可提高电压的质量和降低电网的有功损耗。目前的综控装置主要针对2个电压等级的变电站,其控制策略一般使用九区图原理,易产生变压器分接头调节频繁的缺陷。针对220kV三绕组降压变电站,提出一种电压无功综合控制的总体原则和具体控制策略。根据负荷变化规律,1d被分为谷、谷转峰、峰和峰转谷4种时段。在不同时段采用不同的控制策略,在每个时段以低压侧电压为主控制目标,同时兼顾无功平衡和中压侧电压合格,并尽力实现逆调压。通过预计算调节后电压无功的变化量,并以此作为调节条件的组成部分,防止了频繁调节。在控制策略中还引入高压侧电压过高和过低时的相应控制措施,有利于系统电压的稳定。通过对实际变电站的仿真计算,效果良好。更多还原

【Abstract】 The voltage and r eactive power control system for substations can improve voltage quality and red uce the active power loss.The existing integrated control devices have been des igned to serve for substations of two voltage classes,and their control strat-egy is based on nine zones scheme.So they are inclined to bring the defect of adjusting frequently.The paper presents a kind of volt-age and reactive power control integral principle and concrete control strategy for220kV three wind ing transformer in step-down substations.According to the variety regularity o f the load,a day is divided into four periods,valley,valley turns to peak,p eak and peak turns to valley period.Different control strategies have been emp loyed in different periods.The voltage of low side has been treated as main co ntrol object,and at the same time not only the balance of reactive power,the voltage qualification of middle side has been considered,but also the counter voltage adjustment has been come to realize.The frequent adjustment can be avoided by pre-calculating the magnitude of the voltage and reactive power var iable after being adjusted and basing on it.The control measures have been take n into the control strategy for high side voltage in excess of upper limit or lo wer limit,which is beneficial to voltage stability.The result of the simulatio n calculation shows that the method is correct and effective.更多还原