CN204967278U - Energy -conserving reactive power compensator cabinet based on intelligence electric capacity - Google Patents

Abstract

The utility model relates to an energy-saving reactive power compensation cabinet based on an intelligent capacitor, which includes a cabinet body, and is characterized in that a circuit breaker, a controller and a compensation circuit are arranged in the cabinet, and the compensation circuit includes several groups of three-phase co-compensation circuits and a single-phase split compensation circuit; the three-phase common compensation circuit and the single-phase split compensation circuit both include a capacitor and a switching switch for controlling the capacitor to provide reactive power compensation; the circuit breaker is connected to the three-phase grid power supply for To control the power on and off of the entire reactive power compensation cabinet, the controller is connected in series between the circuit breaker and the compensation circuit, and a voltage detector and a current detector are installed on the power supply of each phase. The utility model adopts three-phase co-compensation and single-phase phase separation to jointly complete the compensation, which solves the problem of unbalanced three-phase compensation, and the switching switch adopts the synchronous zero switching technology, which can realize precise zero-crossing point switching, capacitor switching The cutting process has a small inrush impact, no cutting overvoltage, and no arcing phenomenon.

Description

An energy-saving reactive power compensation cabinet based on smart capacitors

Technical field:

The utility model relates to a power control device, in particular to an energy-saving reactive power compensation cabinet based on an intelligent capacitor.

Background technique:

Most of the electrical loads in the grid, such as motors and transformers, are inductive loads, and corresponding reactive power must be provided to these devices during operation. After installing reactive power compensation equipment such as shunt capacitors in the grid, it can provide reactive power consumed by inductive loads, reducing the reactive power transmitted from grid power to inductive loads and lines, and reducing the reactive power in the grid. Flow, so it can reduce the power loss of lines and transformers caused by the transmission of reactive power. The function of the capacitance compensation cabinet is equivalent to connecting a capacitor in parallel with the electric load. The current of the capacitor will offset a part of the inductor current, thereby reducing the inductor current, the total current will decrease accordingly, the phase difference between the voltage and the current will become smaller, and the power factor will be improved. .

In the existing technology, because the user load uses more frequency converters, the switching switch used in the capacitor compensation cabinet is a composite switch, which has disadvantages such as poor voltage withstand capability, poor anti-surge overload capability, and easy damage. Most of the compensation methods use three-phase simultaneous compensation, which cannot achieve a good compensation effect on the loads of each phase.

Invention content:

The purpose of this utility model is to solve the deficiencies of the prior art and provide a reactive power compensation cabinet with good compensation effect and not easy to be damaged. Its technical scheme is as follows:

An energy-saving reactive power compensation cabinet based on smart capacitors, including a cabinet body, characterized in that a circuit breaker, a controller and a compensation circuit are arranged in the cabinet, and the compensation circuit includes several groups of three-phase co-compensation circuits and single-phase split circuits. Compensation circuit; the three-phase common compensation circuit and the single-phase split compensation circuit both include capacitors and switching switches for controlling capacitors to provide reactive power compensation; the circuit breaker is connected to the three-phase grid power supply for controlling the entire reactive power To switch on and off the power of the compensation cabinet, the controller is connected in series between the circuit breaker and the compensation circuit, and a voltage detector and a current detector are installed on the power supply of each phase.

Further, each set of three-phase co-complementary circuits includes a capacitor composed of three capacitors connected end to end, and is electrically connected to the switching switch through a control line.

Further, each set of single-phase split-complementary circuits includes three capacitors connected in parallel, and one end of the capacitor is electrically connected to the switching switch through a control line, and the other end is grounded.

Further, the switching switch is a synchronous zero switching switch.

Further, the controller and the compensation circuit communicate data information through a serial port, and the serial port can be RS485 or RS232.

Further, the compensation circuit is sequentially connected to the three-phase grid power supply through a lightning arrester and a circuit breaker.

Compared with the prior art, the utility model has the beneficial effects that: the utility model adopts three-phase co-compensation and single-phase phase separation to jointly complete the compensation, which solves the problem of unbalanced three-phase compensation, and the switching switch adopts synchronous zero Switching technology can realize accurate zero-crossing switching, small inrush impact, no cutting overvoltage, and no arcing phenomenon during capacitor switching.

Description of drawings:

Fig. 1 is a schematic diagram of the utility model;

Fig. 2 is a schematic circuit diagram of the utility model;

Fig. 3 is the structural representation in the cabinet of the present utility model;

detailed description:

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figures 1 and 2, an energy-saving reactive power compensation cabinet based on smart capacitors includes a cabinet body 100, and a circuit breaker 200, a controller 300, and a compensation circuit 400 are arranged in the cabinet body 100. The compensation circuit 400 includes several Set three-phase co-complementary circuit 410 and single-phase sub-complementary circuit 420; the number of groups of the three-phase co-complementary circuit 410 and single-phase sub-complementary circuit 420 can be combined and determined according to the capacitance required for switching.

Wherein, the three-phase common compensation circuit 410 and the single-phase split compensation circuit 420 both include a capacitor 500 and a switching switch 600 for controlling the capacitor 500 to provide reactive power compensation; the circuit breaker 200 is connected to the three-phase grid power supply for controlling The power on and off of the entire reactive power compensation cabinet, the controller 300 is used to control the automatic operation of the entire compensation cabinet, the switching switch 600 is connected in series between the circuit breaker 200 and the compensation circuit 400, and the power supply of each phase A voltage detector 700 and a current detector 800 are installed.

The three-phase co-complementary circuit 410 of each group includes a capacitor 500 composed of three capacitors connected end to end, and is electrically connected to the switching switch 600 through a control line.

Each group of single-phase divide-and-compensate circuits 420 includes three capacitors 500 connected in parallel, and one end of the capacitor 500 is electrically connected to the switching switch through a control line, and the other end is grounded.

The switching switch 600 is a synchronous zero switching switch; the controller 300 communicates with the compensation circuit 400 to transmit data information through the serial port 900, and the serial port 900 can be RS485 or RS232.

The compensation circuit 400 is sequentially connected to the three-phase grid power supply through the arrester and the circuit breaker 200, and the arrangement of the arrester can protect the reactive power compensation cabinet from being damaged by lightning.

After the three-phase grid voltage is transmitted to the client, when the client voltage is detected to be low, the controller controls the circuit breaker to automatically close, the compensation circuit is turned on, that is, the switching switch is closed, and the compensation circuit is based on the input calculated by the controller Cut the size of the capacitor and provide reactive power compensation. When the client voltage is within the normal range, the circuit breaker controller controls the circuit breaker to open.

The utility model completes compensation through three-phase co-compensation and single-phase phase separation, which solves the problem of unbalanced three-phase compensation, and the switching switch adopts the synchronous zero switching technology, which can realize precise zero-crossing point switching, capacitor switching The cutting process has a small inrush impact, no cutting overvoltage, and no arcing phenomenon.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (6)

1. An energy-saving reactive power compensation cabinet based on smart capacitors, including a cabinet, is characterized in that: a circuit breaker, a controller and a compensation circuit are arranged in the cabinet, and the compensation circuit includes several groups of three-phase compensation circuits and a single phase-divided compensation circuit; the three-phase co-compensated circuit and the single-phase divided-compensated circuit both include a capacitor and a switching switch for controlling the capacitor to provide reactive power compensation; the circuit breaker is connected to the three-phase grid power supply for controlling the entire For switching on and off the power of the reactive power compensation cabinet, the controller is connected in series between the circuit breaker and the compensation circuit, and a voltage detector and a current detector are installed on each phase of the power supply. 2. A kind of energy-saving reactive power compensation cabinet based on smart capacitors according to claim 1, characterized in that: the three-phase co-compensation circuit described in each group includes a capacitor composed of three end-to-end capacitors, and through A control line is electrically connected with the switching switch. 3. A kind of energy-saving reactive power compensation cabinet based on smart capacitors according to claim 1, characterized in that: each group of described single-phase compensation circuits includes three capacitors connected in parallel with each other, and one end of the capacitor It is electrically connected to the switching switch through the control line, and the other end is grounded. 4. An energy-saving reactive power compensation cabinet based on smart capacitors according to claim 2 or 3, characterized in that: the switching switch adopts a synchronous zero switching switch. 5. An energy-saving reactive power compensation cabinet based on smart capacitors according to claim 1, characterized in that: the controller and the compensation circuit transmit data information through serial communication, and the serial port can be RS485 or RS232. 6. An energy-saving reactive power compensation cabinet based on smart capacitors according to claim 1, wherein the compensation circuit is connected to the three-phase grid power supply sequentially through a lightning arrester and a circuit breaker.