There are a variety of harmonic sources in the power system, and the harmonic source is the electrical equipment that injects harmonic current into the shared power grid or generates harmonic voltage in the shared power grid, and the most harmonic source is the converter equipment and other equipment.
There are generally two kinds of harmonic generation, one is on the input side of the inverter, and the principle is that the harmonics caused by its nonlinearity occur in the rectifier circuit on the power supply side. The second is the harmonic generation on the output side of the inverter, the principle is in the inverter circuit, for the voltage circuit, the output voltage is a rectangular wave. In the case of a current-type circuit, the output current is a rectangular wave. Rectangular waves contain more harmonics. From this, some people conclude that the harmonics that exist in the power grid are mainly due to the existence of various nonlinear elements in the power system.
In order to reduce the impact of harmonics on the power grid caused by the inverter and cause more and more harmonic pollution in the power grid, the inverter manufacturer attaches great importance to the management of harmonics, and Shenzhen Anbangxin inverter manufacturer is one of them. In the Anbangxin brand inverter series products, the harmonic rate is permanently controlled within the national standard, less than 5%, and now there are two ways for Anbangxin to use harmonic management, one is to install communication reactors and DC reactors. The second is to install filters. These two harmonic management methods are the most pervasive and effective methods at present.
The following analyzes and introduces the principles of these two types of harmonic management methods
1. Install communication reactor and DC reactor. When the inverter is used in the distribution transformer capacity is greater than 500kva, and the transformer capacity is greater than 10 times of the inverter capacity, a communication reactor is installed on the input side of the inverter. When the output voltage of the distribution transformer is unbalanced in three phases and the unbalance rate is greater than 3%, a communication reactor needs to be installed.
2. Install passive filter: the passive filter is installed on the communication side of the inverter, and the passive filter is composed of L, C and R components to form a harmonic resonance loop, when the harmonic frequency of the LC loop is together with a certain higher harmonic current frequency, the higher harmonic can be prevented from flowing into the power grid.
3. Install an active filter: the active filter detects the higher harmonics in the current, and inputs the opposite phase current to the higher harmonic components according to the detection results, so as to achieve the purpose of real-time compensation of harmonic current. Compared with passive filters, it has a high degree of controllability and fast response, and has the characteristics of multiple functions. It also eliminates the risk of resonance with the system impedance.
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