What is the role of reactive power compensation in the power system?

Reactive power compensation is an indispensable part of the power system. By performing reactive power compensation, the energy consumption of the power system can be reduced and transmission efficiency can be improved; Maintain the stability and reliability of the power system; Improve power quality and ensure the normal electricity demand of users. Therefore, the importance of reactive power compensation cannot be ignored.

1. What is reactive power compensation

When it comes to reactive power compensation, we must first talk about reactive power. In fact, in AC circuits with reactance, electric or magnetic fields sometimes absorb energy and sometimes release energy. Energy is exchanged back and forth between the power source and the reactor. Although the average power throughout the entire cycle is zero, the energy that establishes, maintains, and transforms the magnetic field does not do any work, so it is called reactive power.

Reactive power compensation in the power system refers to the installation of reactive power compensation devices in the grid to supplement reactive power, in order to ensure the stable operation of the system and meet the needs of users for reactive power. This ensures that the electrical equipment can operate at rated voltage.

2. The role of reactive power compensation in the power grid

① Improve the power factor of the power supply system and load

After installing reactive power compensation devices, the useless power in the system can be reduced, the power factor can be improved while keeping the active power constant, the losses of lines and equipment can be reduced, and the transmission efficiency of the system can be improved.

② Improve voltage quality

By implementing layered, partitioned, and locally balanced configurations of reactive power compensation devices, reactive power balance can be achieved at various voltage levels to improve voltage quality

③ Reduce power loss in the power grid

After setting up reactive power compensation devices, the power grid lines can reduce or eliminate the transmission of reactive current. As the current decreases, the line loss, voltage loss, and other losses also decrease, thereby reducing power loss

④ Improve equipment power supply capability

When the rated capacity of electrical equipment is constant and the voltage and current remain the same, the higher the power factor, the greater the active power, which can fully tap into the potential of the equipment and improve its power supply capacity

⑤ Reduce equipment capacity and save investment

Under the same condition of active power transmission, increasing the power factor can reduce reactive power and apparent power, thereby reducing the installation capacity of equipment in the power grid, saving infrastructure investment, and reducing costs

In summary, reactive power compensation plays an important role in the power system, which can improve the stability, efficiency, and reliability of the system.