Harmonic hazards:

1. Harmonics will make the reactive power compensation device unable to operate normally, resulting in reactive power fines; harmonic impact will cause the capacitor value of the compensation cabinet to decay and be damaged, making it impossible to compensate for reactive power, resulting in power adjustment fee fines; serious oil leakage and fire accidents will occur, affecting the safe operation of the power system. Inductive loads such as motors consume a lot of reactive power during operation, and companies that use a large number of frequency converters must ensure the normal operation of reactive power compensation.

2. Harmonics cause some modern precision control machine tools and equipment to fail to operate; It is necessary to take harmonic control measures for the inverter system. According to the characteristics of inverter harmonics, our company has designed a special filter compensation device, which can effectively filter out the harmonics generated by the inverter device and effectively compensate the system for reactive power, turning fines into rewards. The effect is immediate and the effect diagram is available.

Main features of the device:

It effectively filters out the characteristic harmonics (5th, 7th, 11th, and 13th) generated by the inverter, ensuring that the power factor is compensated to above 0.9 when the load is heavy or light, and there will be no reactive power under-compensation or over-compensation; Stable and safe: It presents high impedance to the upstream harmonic current and does not absorb the upstream harmonic current: there will be no harmonic amplification, avoiding the risk of capacitor fire. The filter device operates intelligently and automatically, with stable performance and high reliability, no maintenance required, and reliable operation.

Project description:

A chemical plant in Xingtai, Hebei Province was the site renovation project undertaken by our company. The plant consists of 2 1250 transformers and 52 3-110KW inverters. The inverters often burn out. A large number of fuses and capacitors in the reactive power compensation cabinet in the main power distribution room burn out, and the compensation cabinet cannot be put into use normally. Reactive power fines have been continuously issued. On-site detection shows that the 5th and 7th harmonics are seriously exceeded.

Governance plan:

Our company treats the harmonics of the inverter according to the characteristics of the harmonic content of the transformer. The solutions are as follows: The solution for the 1# transformer is to install a 200A active filter to absorb the on-site harmonics, and at the same time transform the compensation cabinet into a reactive power compensation and harmonic control system XHFC; the reactive power compensation of the 2# transformer is directly transformed into a reactive power compensation and harmonic control system XHFC. The on-site data is as follows: