并网准则要求下的风电场设计和分析方法

Assessment of Grid Code Requirements for Wind Power Plant

随着风力发电比重的增加,电网对风电场并网的技术要求也越来越严格。为了确保规划的风电场满足电网的并网技术准则,并网运行风电场的方案必须根据并网技术准则的要求进行设计。对风电场并网准则的技术内容进行了分析,介绍了维斯塔斯公司根据并网准则进行风电场方案设计的方法。这些方法包括根据并网准则要求设计主回路;计算短路电流,检验方案的短路容量是否满足要求;通过潮流计算确定并网准则对无功补偿设备的容量要求;分析风电场在电网电压下降时的暂态行为,判断并网准则中的低电压穿越要求对方案的影响;给出了当规划的风电场不符合并网准则时应采取的解决措施,如采用无功补偿及相应的补偿设备和补偿量。文章最后给出了相应的算例分析。

Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increases. To ensure that a wind power plant meets the grid code requirements, the wind power plant must be designed according to the requirements of the grid codes. This paper analyzes the grid codes in general and then introduces the grid code study methods employed in Vestas. These methods include wind power plant main circuit design; calculation of short circuit currents, validation of the short circuit capacity of the equip- ment; computation of the steady state reactive power requirements; analysis of the wind power plant＇ s low voltage ride through capability. The paper concludes with a detailed case study of such methods.