There is a significant amount of reactive power exchange between power equipment and the power grid.
Release time:
2023-05-15 14:42
Source:
Overview: With the development of modern power electronics technology, power electronic devices have been widely used, and there is a large amount of reactive power reciprocating exchange between power equipment and the power grid. Reactive power is divided into: inductive reactive power (current vector lags voltage, such as motors, transformer coils, thyristor converters, etc.), capacitive reactive power (current vector leads voltage, such as capacitors, cable transmission and distribution lines, power electronics advanced control, etc.), fundamental reactive power (reactive power equal to the grid frequency). Reactive power does not do work, but it occupies grid capacity and conductor cross-sectional area, causing increased line voltage drop and overloading of power supply and distribution equipment.
Multi-channel detection control board, completes multi-channel current detection and protection. This board is an optional component depending on the device configuration.
According to the device capacity and compensation requirements, it can be divided into a basic cabinet and an expansion cabinet. The expansion cabinet supplements the capacity of the basic cabinet. The basic cabinet can be compensated independently, and the expansion cabinet must be used in conjunction with the basic cabinet.
Functions: Improve the power factor to above 0.9 to avoid reactive power fines; stabilize the grid voltage to meet national standards or user requirements; reduce the power supply capacity of the transformer; reduce the losses of the power supply and distribution system, and save energy.
Basic principle: After the load is running, reactive current reciprocates between the load and the power grid. At this time, the single-chip microcomputer of the compensation device detects the size of the current inductive reactive current and immediately issues a command to input the corresponding capacitive current to offset the inductive reactive power, improve the power grid's power supply capacity, and ensure the reliable operation of electrical equipment.
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