基于柔性直流技术的风电场并网系统电压稳定研究
摘要：以霍林河地区某孤立系统为研究对象,以降低系统电压波动和提高系统电压稳定性为目的,提出风电场采用柔性直流方式接入系统。柔性直流输电方式基于具有自换向特性的电压源换流器,并采用脉宽调制技术,实现了有功无功的解耦,从而可进行独立连续的调节。首先对采用不同输电方式和不同风电并网容量的系统进行稳态潮流仿真,负荷节点电压维持在稳定范围内;之后对系统中常规机组故障、负荷故障和线路故障进行暂态仿真,故障后电压波动在允许范围内,并迅速趋于平稳,无需稳定措施。仿真结果表明,风电场可以采用柔性直流输电方式接入系统,系统电压稳定性较常规交流方式有很大提高。
Abstract:Using an isolated system in Huolinhe as an example,the access mode of wind power plant to system by flexible DC mode is proposed to reduce the system voltage fluctuation and improve system voltage stability. In Flexible DC power transmission mode, voltage source converter has directional characteristics, and the decoupling of active power and reactive power is realized by using pulse width modulation technology, which can be achieved in an independently continuous way. At first, the steady power flow calculation is carried out by using of systems with different power transmission modes and different grid-connected capacities, and the voltage level on load nodes can maintain within stable range. Then, transient state of system is simulated under such fault cases as the conventional generator fault, load fault and line fault in the system, and voltage fluctuation is also maintained within the allowable range, and can stabilize quickly without the adoption of control measures. The results of the simulation show that wind farm can be connected to system by flexible DC power transmission technology, and the stability of system voltage can be improved greatly by comparing with that by conventional AC transmission.
标题：基于柔性直流技术的风电场并网系统电压稳定研究
英文标题：Voltage Stability Analysis of Wind Power Integrated System Based on Flexible HVDC Technology
作者：孟令龙, 刘文霞, 张建华,
关键词：风电并网, 电压稳定, 电压波动, 柔性直流输电,
发表日期：2014-08-09
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