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基于软开关投切的无功补偿技术的研究 摘 要 无功功率补偿装置在电力系统中所承担的作用是提高电网的功率因数，降低供电变压器及输送线路的损耗，提高供电效率，改善供电环境。所以无功功率补偿装置在电力供电系统中处在一个不可缺少的非常重要的位置。合理的选择补偿装置，可以做到最大限度的减少网络的损耗，使电网质量提高。反之，如选择或使用不当，可能造成供电系统，电压波动，谐波增大等诸多因素。本文设计的就是一种基于可调电压源的无功补偿新思路。 软开关是电器回路中用于连通和切断负载的一种方式，这种方式系指负载的切断和接通不是瞬间突然地完成，而是逐渐地由小到大完成接通过程，逐渐地由大到小完成切断过程。基于软开关的这一性质，设计中的电路在切断和连接时瞬时冲击电流非常小。同时设计中通过对可调电压源的调节使得无功补偿得以调节，功率因素更趋近于“一”。 在这种通过软开关实现的电容式补偿设计中,由于功率因素容易调节，使得无功补偿的效果更好，经济效益也更容易实现。同时去除了硬开关投切，避免了冲击电流，使得元器件的寿命更长。而引入多级拓扑结构后，通过对各级电容的投切，各类高、低压环境都可以胜任，适用面更广泛。 关键词：无功补偿 ；软开关；可调电压源；多级拓扑 Study on Technology of Reactive Power Compensation Based on Soft-switch Switching Reactive power compensation equipment in power systems is the role assumed by the grid to improve power factor, lower power transformer and transmission line losses, improve power efficiency and improve power supply environment. Therefore, reactive power compensation equipment in power supply systems in an indispensable position is very important. Reasonable choice compensation device, the network can do minimize the loss, so that power quality. Conversely, if selection or improper use may cause power supply system, voltage fluctuations, harmonics and other factors increase. This article will provide an adjustable capacitor reactive power compensation ideas. Soft switch the electrical circuit for connectivity and a way to cut off the load and the device, this approach means the load is not turned off and the moment of completion, but gradually turned from small to complete the process, gradually to complete the cutting process of descending. Because of the nature of the soft switch makes the circuit design of transient connections in the cut and the impact of current is very small. At the same time the design of adjustable voltage source through the regulation of reactive power compensation made to adjust the power factor more close to 1. In this achieved by soft-switching capacitor compensation design factors as easily adjust the powe