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Application of Reactive Power Compensation Device to Assist an Environmental Protection Energy Project in Jiangsu Province

Release time：

2023-05-18 10:21

1. Principle analysis

1.1 In the AC circuit, there are two types of electrical power supplied to the load by the power supply; One is active power and the other is reactive power.

Active power: the electrical power required for normal operation, that is, the electrical power that converts electrical energy into other forms of energy (mechanical energy, light energy, thermal energy).

Reactive power: more abstract, it is the electrical power used for the exchange of electric fields and magnetic fields in circuits, and used to establish and maintain magnetic fields in electrical equipment. It does not work externally, but transforms into other forms of energy. Any electrical equipment with electromagnetic coils, to establish a magnetic field, must consume reactive power. For example, a 40-watt fluorescent lamp, in addition to more than 40 watts of active power (the ballast also needs to consume a part of the active power) to emit light, also needs about 80 reactive power for the coil of the ballast to establish an alternating magnetic field. Because it does not do external work, it is called "reactive".

Q: Reactive power (Kvar), S: apparent power (KVA), P: active power (Kw), PF: power factor

1.2 Adverse effects of low reactive power:

1. Reduce the output of the active power of the generator

2. Reduce the power supply capacity of transmission and transformation equipment

3. Line loss increases and power loss increases

4. The power factor decreases, the electricity bill increases, and the cost increases

5. Make the electrical equipment not give full play

1.3 Principle of reactive power compensation of shunt capacitor:

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