What are the characteristics of frequency modulation and voltage regulation in power system?

Frequency modulation and voltage regulation are common contents in power system stability analysis, and their main purpose is to meet the balance of active power and reactive power in power system.

Frequency modulation is divided into primary frequency modulation (spontaneous and uncontrollable units), secondary frequency modulation (special frequency modulation units) and tertiary frequency modulation (power optimization problem) and catenary frequency modulation (solving the problem of regional power grid interconnection). The system is mainly composed of primary frequency modulation and secondary frequency modulation. The characteristics of primary frequency modulation are as follows: ① The unit is spontaneous. For example, the load suddenly increases, the frequency decreases and the output of the unit increases. ② Differential frequency modulation. Characteristics of secondary frequency modulation: ① There is a special frequency modulation unit. ② deadbeat frequency modulation.

Voltage regulation is generally carried out at the central point. There are reverse voltage regulation, forward voltage regulation and constant voltage regulation. The basic method is to use reactive power generator to compensate. Such as adjusting the generator terminal voltage, changing the transformer ratio, capacitance compensation, static compensator compensation and so on.

Finally, I recommend several classic books on power system analysis, one is Power System Analysis (I) by Zhu Junwei, 1995, and the other is Power System Analysis (II) by Xia Daozhi, 1995. One is Modern Power System Analysis by Wang Xifan. The above is suitable for graduate students to read. Another book, Steady State Analysis of Power System and Transient Analysis of Power System, is suitable for undergraduates.