小水电灵活并网控制技术研究
Research on the Flexbile Control Technology of Small Hydropower for Grid Connection
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摘要:
小水电作为一种清洁无污染、可再生、具有良好生态与社会效益的绿色能源，其重要性日益突出。小水电大多分布在山区地带，其中多数小水电为缺乏库容调节能力的径流式水电站。由于山区10 kV馈线供电距离长，沿线大量小水电的无序并网，导致馈线电压经常性越限，严重影响配电网的正常运行。提出一种灵活的网络控制方法，利用调整小水电并网点的方法，改变馈线潮流方向，从而实现抑制馈线电压越限的效果。同时根据广东某地区的小水电线路案例，设计了相应的算例进行仿真计算，验证了所提出方法的正确性和适用性。 Abstract:As a clean non-polluting and renewable energy, small hydropower has great ecological and social benefits and its importance is increasing. Usually, Small hydropower is dispersed on mountainous regions. Most of small hydropower is run-of-river hydropower plant. The line voltage often leaps over the floor or ceiling following the varied output of small hydropower which is T-connected to the 10kV feeder disorderly. It seriously affects the distribution network's normal operation. In this paper, a control method based on fexible network is propsed to change the direction of the power flow and control the line voltage by adjusting the small hydropower's connecting position. Based on a regin of Guangdong with rich small hydropower, a simulation case is established to verify the correctness and applicability of the method which is proposed.
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