110kV变电站无功电源协调运行与调压方法精要.doc

110kV变电站无功电源协调运行与调压方法 摘 要 电力系统的运行电压过高和过低都会影响电力系统的安全经济运行。影响用户的安全生产和产品质量，影响用电设备的寿命和安全，并可能造成供电设备和用电设备的损坏。 电力系统中的电压水平和无功功率状况是密切相关的。无功功率的输送会产生电压损耗，降低无功功率造成的电压损耗的办法是减少无功功率在电网中的流动，即采用就地无功补偿的办法，同时，为了维持电力系统电压的稳定性，要保持所有无功电源发出的无功功率要等于所有负荷所消耗的无功功率和系统中各环节上无功功率损耗之和。 以变电站为单位的就地调压无功补偿方案以其原理简单、实现电压无功三级控制的一种快速简便、经济可靠的手段而得到广泛应用。动态地控制变压器分接头位置和电容、电抗器的投切，实现电压和无功的闭环控制，使得电压维持在合格范周内。提高电压合格率，无功电源实现就近平衡、动态补偿，降低无功损耗。本文通过模拟分析110kV变电站的电压无功三级控制以了解变电站的无功电源协调运行与调压方法。 关键词：变压器,无功,电压 Abstract Either over-voltage operation or under-voltage operation of the electric power system shall affect the safe and economic operation of the power system, safety production and product quality and the service life and safety of the equipment that uses the electric power, and it is also possible to cause the damages to the power supply equipment and the power}use equipment. In the electric power system, the voltage level is closely related to the reactive power conditions. Transmission of the reactive power will cause a voltage loss. The method for reducing the voltage loss caused by the reactive power is to reduce the flow of reactive power in the power network, i.e. the method of local reactive power compensation will be used, and meanwhile, the reactive power from all the reactive power supplies should be ecqual to the sum of the reactive power consumed by all loads and the reactive power loss of each link in the system. The Local Voltage Regulation and Reactive Power Compensation Scheme with a simple principle, which takes a substation as a unit to realize a voltage and reactive power 3-level control by rapid, simple, economic and reliable means. is used widely. The voltage and reactive power control of a substation means that based on measuring and analyzing of operation data e. g. voltage, reactive power, etc.，of the substation, the tap positions of the transformer and the switching ON/OFF of the capacitor/reactor are controlled dynamically according to the actual operation conditions of the powe