After the load is running, reactive current is reciprocally exchanged between the load and the power grid.
Release time:
2023-05-15 14:44
Source:
Overview: With the development of modern power electronics technology, power electronic devices have been widely used, and a large amount of reactive power is reciprocally exchanged 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, and power electronics advanced control, etc.), and 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.
Applicable scenarios: Sites where the reactive power of the load changes frequently, the power factor is low, and the harmonic current is small.
System Composition and Corresponding Functions
Total current and load current detection, used for reactive power calculation and display.
The reactive power calculation and control unit completes the reactive current calculation, sending of on/off commands, parameter setting, etc.
Compensation control unit (power unit), including thyristors and triggering, unit management board, internal current detection, completes the command of the switching board, turning on or off the compensation path, and parameter setting.
Capacitor, completes compensation.
Fan and relay part.
Multi-channel detection and 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 perform compensation independently, while the expansion cabinet must be used in conjunction with the basic cabinet.
Functions: Improve the power factor to above 0.9, avoid reactive power penalties; stabilize the grid voltage to meet national standards or user requirements; reduce the power supply capacity of the transformer; reduce the power supply and distribution system losses, saving energy.
Basic principle: After the load is running, reactive current is reciprocally exchanged between the load and the power grid. At this time, the microcontroller of the compensation device detects the magnitude of the current inductive reactive current and immediately issues a command to apply the corresponding capacitive current to offset the inductive reactive power, improving the power grid's power supply capacity and ensuring the reliable operation of the electrical equipment.
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