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为减少水电机组一次调频合格率低、实际积分电量经常不达标问题,提出了增强型一次调频的频差算法,借助建模仿真的方法对增强型一次调频的动态响应过程进行模拟,并将增强型与普通型一次调频的反调效果、动态响应指标、功率积分电量、调频频繁动作进行比较。结果表明,增强型一次调频由于其频差算法的不同,在网频超出频率死区后,其频差Δf有大小为Ef的阶跃,且比普通型一次调频始终大Ef,使调节初期的反调峰值更大,反调峰值时间更短,一次调频调节量更大;在动态响应指标不受太大影响的情况下,使机组调节幅度增大,理论积分电量更多,机组更容易满足一次调频积分电量考核的要求。但因其速动性和幅度的增加,在一次调频频繁动作的情况下,会导致调速系统的加速磨损,也会引起机组功率的大幅波动和漂移。因此,在选择使用增强型一次调频算法时,需对机组安全性及对电网的影响进行评估。
In order to reduce the low pass rate of primary FM of hydroelectric generating set and the actual integral power is often not up to standard, the frequency difference algorithm of enhanced primary frequency modulation is put forward, and the dynamic response process of SRF is simulated with the method of modeling and simulation, Type and ordinary FM response, the dynamic response indicator, the power integral power, FM frequent actions are compared. The results show that the enhanced primary FM due to its different frequency difference algorithm, after the network frequency beyond the frequency of the dead zone, the frequency difference Δf has a size of Ef step, and compared with the ordinary primary FM always Ef, so that the initial adjustment The peak of the anti-peaking is bigger, the anti-peaking peak time is shorter and the frequency of the first tuning is larger. Under the condition of the dynamic response index is not affected too much, the adjusting range of the generating set is increased and the theoretical integral power is more, Integral power assessment requirements. However, because of its speediness and amplitude, frequent acceleration and deceleration of a speed regulation system will lead to accelerated wear and tear of the speed regulation system and will also cause large fluctuations and drifts of the power of the power unit. Therefore, when choosing to use the enhanced primary FM algorithm, the safety of the crew and the impact on the power grid should be evaluated.