风场及其送出线保护配置与整定研究

现有风场及其送出线保护多从保障风机或各元件自身安全角度进行简单配置整定,可能存在保护范围不明确,选择性和灵敏性未进行系统校验等问题。结合风电故障特征,给出了风电场提供故障电流最大值的简化计算公式,提出了兼顾风机安全与系统可靠性的风场及送出线保护配置与整定原则。并以吉林某风场为例,尝试给出了风机、箱变、集电线、母线、主变在内的风场及其送出线保护的配置原则,定量化校验了集电线路电流保护配置与整定的合理性。

Configuration and setting of relay protection for wind farm and its outgoing line

The relay protections of the wind farm and its outgoing line are set for the security of wind generators or the protected components. The protection zones might be unclear. Moreover, the selectivity and the sensitivity of the protections have not been examined systematically. Combined with wind power fault characteristics, the maximum fault current provided by wind generators is calculated. The configuration and setting of relay protection for wind farm and its outgoing line is proposed with the compromise between the security of wind generators and the reliability of the whole system. Furthermore, a typical wind farm in Jilin province is taken as an example to do the setting and sensitivity calculations. The relay settings of the wind generator, step-up transformer, collector line, bus, main transformer and outgoing line are discussed in detail. The overcurrent protection of collector line is set and the selectivity and sensitivity of the protection is analyzed as well.