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由于电网建设与电源建设、负荷发展存在时间差,现有网架结构和地区用电负荷可能难以满足大型能源基地电能送出的需求。为了解决这一问题,提出了1套电力系统稳定器(power system stabilizer,PSS)的参数优化方案。在综合考虑系统需求及机组稳定性的基础上,通过增加1级超前滞后环节来改善本机PSS的频率特性,找出影响电能送出的振荡模式,针对该模式对机组励磁系统进行重点相位补偿。优化参数比原始参数具有更平缓的幅频特性和较大的临界增益。采用电力系统综合分析程序,分别通过时域仿真和现场试验的方法,验证了该电站开机极限功率在2010年夏季丰水期方式下可以由1765MW提高到2900MW。研究结果表明:优化并网机组PSS的参数可有效改善系统的动态稳定水平,提高电网的外送能力。
Due to the time difference of load development due to power grid construction and power supply construction, the existing grid structure and regional electricity load may be difficult to meet the needs of large-scale energy base for power transmission. In order to solve this problem, a set of parameters optimization scheme of power system stabilizer (PSS) is proposed. On the basis of comprehensive consideration of system requirements and unit stability, the frequency characteristics of the local PSS are improved by adding a lead time lag, and the oscillation modes that affect the power delivery are found out. The phase compensation of the excitation system is focused on. The optimization parameters have a more gentle amplitude-frequency characteristic and a larger critical gain than the original parameters. The power system comprehensive analysis program is used to verify that the power-on limit power of the power station can be increased from 1765MW to 2900MW in the summer of 2010 during the wet season in summer by means of time-domain simulation and field test respectively. The results show that optimizing the PSS parameters of grid-connected units can effectively improve the dynamic stability of the system and improve the delivery capacity of the grid.