Reactive power (current vector lags voltage, such as motors, transformer coils
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 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, power electronics leading 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 wire 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 power current calculation, the sending of switching commands, parameter setting, and other functions.
Compensation control unit (power unit), including thyristors and triggering, unit management board, internal current detection, completes the switching board commands, switching on or off the compensation path, and parameter setting.
Capacitors, for compensation.
Fan and relay section.
Multi-channel detection control board, which completes multi-channel current detection and protection. This board is an optional component depending on the device configuration.
Depending on 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, and the expansion cabinet must be used in conjunction with the basic cabinet.
Functions: Increase the power factor to above 0.9 to avoid reactive power penalties; stabilize the grid voltage to meet national standards or user requirements; reduce the power supply capacity of the transformer; reduce power supply and distribution system losses, and save energy.
Basic Principle: When the load is running, reactive current is reciprocally exchanged 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, offsetting the inductive reactive power and improving the power grid supply capacity, ensuring reliable operation of the power equipment.
Related News
On-site secondary debugging - Guangdong Electromagnetic Technology Company
Our company provided compensation filter devices (on-site load type: twenty-roll reversible cold rolling mill) to a certain electromagnetic technology company in Guangdong. There are two sets of equipment on site, and all debugging has been completed.
YiNeng Electric · Professional equipment service provider in renewable energy field
Beijing YiNeng Electric Technology Co., Ltd.
Address: No.27, Keyuan Road, Daxing District, Beijing
Copyright©Beijing YiNeng Electric Technology Co., Ltd.