Low voltage reactive power compensation controller

The product is beautiful in appearance, universal in size, easy to install and use. Man-machine dialogue is realized through digital tube display and buttons. Through 485 communication and intelligent integrated power capacitor connection, it can realize the switching control of the intelligent integrated power capacitor 18, and the control physical quantity is voltage, current, power factor and reactive power composite type. The new reactive power trend estimation algorithm is especially suitable for occasions with large power factor variations. The number of actions is small and the control accuracy is high.

First. Overview

The reactive power compensation controller (hereinafter referred to as the controller) is a new-generation low-voltage reactive power compensation controller designed and developed by a dedicated power parameter acquisition chip and MCU processor according to relevant national technical standards, procedures and user requirements. The product is beautiful in appearance and easy to install and use. Human-machine dialogue is achieved through liquid crystal displays and buttons. Connected to the intelligent integrated power capacitor via 485 communication. Control physical quantities include: voltage, current, power factor, and the like. AC sampling technology is especially suitable for occasions with large power factor variations. The number of actions is small and the control accuracy is high.

Second, the functional characteristics

1) Data such as voltage, current, power, and power factor are obtained by AC sampling.
2) Dynamic display of each parameter value of the power distribution, the parameter setting is simple and fast, and the set parameter is not lost.
3) Automatically detect the quantity and capacity of the smart capacitor, and control the smart capacitor switching according to the grid reactive parameter.
4) With overvoltage, undervoltage, voltage alarm, undercurrent, overtemperature, voltage, current harmonic protection, when the grid parameters exceed the set limits, the controller quickly cuts off the input capacitor and blocks the output, protecting the capacitor Safe operation and extended service life.
5) Using voltage, current, power factor, reactive power and other comprehensive calculations, the voltage hysteresis participates in the control judgment, so that the compensation is more accurate and the switching oscillation is prevented.
6) Multi-sampling the above-mentioned criterion value during the action delay time, and performing reactive power trending current judgment according to the value of each point, avoiding the judgment error caused by single-point sampling of the operating point of the conventional controller, in the power factor change In large cases, the reactive power and compensation direction (injection or cutting) of the required compensation can be accurately determined.
7) With manual / automatic switching function. When set to automatic, the capacitor input or cut-off is controlled according to the combination of voltage, load, power factor and reactive power shortage; when the manual is set, the input or cut-off of the capacitor can be manually operated, which is convenient for factory debugging and fast switching capacitor. Analog switching can be achieved in both manual and automatic states.
8) The principle of switching: cyclic switching to extend the life of the capacitor.

Third, the use of the environment

Relative humidity: 20%~90%;
Ambient temperature: -25~70°C;
Altitude: ≤2000m;
No flammable medium exists, no conductive dust and corrosive gas are present.

Fourth, technical parameters

1) Measurement accuracy:
Voltage: ≤±0.5% (in the range of 80%~120% rated voltage);

Current: ≤±1.0% (within 50%~100% of rated current);
Power factor: ≤ ± 1.5%
Power: ≤ ± 2%
Temperature: ≤1°C
2) Output mode: RS485 communication type control output, control the company's smart capacitors.
3) Power supply conditions:
Working voltage: 380V AC

Voltage deviation: ±20%
Rated frequency: 50Hz ± 5%
Power consumption: <5W
4) Number of networking: The total number of stations is ≤ 30, and the number of intelligent capacitors is ≤ 10, and the total number of smart capacitors is ≤ 20.