In the AC circuit of the diesel generator set , there are two kinds of electric power supplied by the power source, one is active power and the other is reactive power. Active power is the electrical power required to keep a consumer operating normally, that is, the electrical power that converts electrical energy into other forms of energy (mechanical, optical, thermal). Various lighting devices convert electrical energy into light energy for people to live and work with. The sign of active power is denoted by P and is expressed in watts (W), kilowatts (kW), megawatts (MW). Reactive power is relatively abstract, it is used to exchange electric and magnetic fields in the circuit, and is used to establish and maintain the electrical power of the magnetic field in electrical equipment. It does not work externally, but instead transforms it into other forms of energy. For electrical equipment with electromagnetic coils, reactive power must be consumed to establish a magnetic field....