Because power systems are complex and multi-variable, it is very difficult to realize automatic secondary load-frequencycontrol.
电力系统一般都很复杂且变量又多,实现二阶负载—频率自动控制也相应变得很困难。
2
A set of automaticcontrol instrument of frequency and load with high reliability and convenient regulation has been produced, test of which shows theoretic analysis's correctness.