CN202524098U

CN202524098U - Reactive power compensation device

Info

Publication number: CN202524098U
Application number: CN 201220213061
Authority: CN
Inventors: 迟君平
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-14
Filing date: 2012-05-14
Publication date: 2012-11-07
Anticipated expiration: 2022-05-14

Abstract

The utility model belongs to the technical field of power electronic technologies and relates to a reactive power compensation device. The reactive power compensation device comprises a rectifier bridge, a capacitor and three reactors, wherein the rectifier bridge is connected with a power supply, the capacitor is connected with the rectifier bridge, the three reactors are parallelly connected into a power system, six insulated-gate bipolar transistors are further parallelly connected between the capacitor and the three reactors, each insulated-gate bipolar transistor is in reverse parallel connection with a diode, and the diodes are high-reverse-resistance point-contact type diodes. A direct-current voltage of the capacitor can be transformed into a three-phase alternating-current voltage synchronous to the voltage of the power system through controlling the switch-on/off of the six insulated-gate bipolar transistors. The technical scheme provided by the utility model has the advantages of good extensibility, capability of realizing dynamic, continuous and synchronous compensation, no generation of harmonics, high response speed, power factor increase, line loss reduction and the like.

Description

Reactive power compensation device

Technical field

The utility model belongs to electric and electronic technical field, is specifically related to a kind of reactive power compensation device.

Background technology

Along with the development of modern industrial technology, increasingly high requirement has been proposed for the safe operation of the quality of power supply, energy-efficient performance and the power consumption equipment of electrical network.Reactive power compensation device is to guarantee electric power quality, reduce grid loss and guarantee the indispensable part of its safe operation, in power supply system, has important effect.The imbalance of power system reactive power can cause the huge fluctuation of line voltage, can cause collapse of device damage even system voltage and stability disruption accident when serious.Therefore; Reactive power is the pith of AC electric power systems design and running; Not only the most of elements in the electrical network need consume reactive power; And most of user loads also need consume reactive power, for example equipment such as transformer, inductor motor, gas discharge electric light, electric fan, air-conditioning, refrigerator.The reactive power that these network elements and load are consumed needs the compensation of the acquisition somewhere from electrical network in time, otherwise can influence the safety of electric power system and power consumption equipment.And through long-range generator compensate above-mentioned reactive power be unreasonable also be unpractical, therefore need the design reactive power compensation device, to stablize line voltage and to reduce power consumption.

Through the development of many decades, formed the reactive power compensation device of many types in the prior art.But reactive power compensation device of the prior art adopts the aggregation type package assembly mostly, and the fixed-site of each element and space availability ratio are not high, and autgmentability is poor, exports reactive current in addition in addition and influenced by busbar voltage, is prone to produce defectives such as harmonic wave.

Therefore, there is defective in prior art, haves much room for improvement.

Summary of the invention

(1) utility model purpose: for solving the problem that exists in the above-mentioned prior art, the purpose of the utility model provides a kind of reactive power compensation device.

(2) technical scheme:

A kind of reactive power compensation device comprises rectifier bridge, capacitor, three reactors, and said rectifier bridge links to each other with power supply; Said capacitor links to each other with rectifier bridge; Said three reactors parallel connection inserts electric power system, between said capacitor and said three reactors, also is parallel with six igbts; Said six igbts are parallelly connected with a diode reverse respectively; Break-make through controlling said six igbts can change the direct voltage on the said capacitor into the three-phase alternating voltage synchronous with power system voltage, and wherein, said diode is high backward resistance point-contact diode.

Described reactive power compensation device, its reactive power are 35Kvar.

(3) beneficial effect.The reactive power compensation device that the utility model provides is the controllable reactive power generator of a kind of miniaturization.This device is to accomplish control output voltage and current waveform through voltage source inverter, thereby produces continuously or absorptions needs the reactive power that compensates.Because voltage source inverter can produce required arbitrarily voltage waveform and control the waveform that self sends, so this device can reduce the influence of voltage harmonic to self.Operation principle is that capacitive and the awareness character that a voltage waveform inverter is regulated reactive power continuously through a reactance connecting system bus must improve the system power factor.

The technical scheme that the utility model provides has following beneficial effect:

(1), modularized design can independently be used to substitute mechanical switched capacitor unit in original capacitance compensation, and have good autgmentability;

(2), the output reactive power changes from the capacitive to the perception continuously, can realize dynamically, continuously, synchroballistic;

(3), the output reactive current is not influenced by busbar voltage;

(4), do not produce harmonic wave, possess the humorous wave energy of inhibition, ensure using electricity system safety;

(5), suppress voltage fluctuation and flickering, keep receiving end voltage, the strengthening system voltage stability;

(6), corresponding speed is fast, and the bucking-out system reactive power also improves power factor, reduces line loss, optimizes electric cost.

Description of drawings

Fig. 1 is the structure chart of the reactive power compensation device that provides of the utility model.

Embodiment

Below in conjunction with preferred embodiment the utility model is explained further details.

As shown in Figure 1, a kind of reactive power compensation device comprises rectifier bridge, capacitor C, three reactor La, Lb, Lc; Said rectifier bridge links to each other with power supply, and said capacitor C links to each other with rectifier bridge, and said three reactors parallel connection inserts electric power system; Wherein, Between said capacitor C and said three reactors, also be parallel with six igbt V1 ~ V6, said six igbt V1 ~ V6 respectively with six diode VD1 ~ VD6 reverse parallel connections.Described reactive power compensation device, wherein, said diode is high backward resistance point-contact diode.

Through the break-make of said six igbts of suitable control, can the direct voltage on the said capacitor be changed into the three-phase alternating voltage synchronous with power system voltage, and through three reactor La, Lb, Lc parallel connection connecting system.Suitably the output voltage of control inverter just can the modifier operating condition, makes it be in capacitive load, inductive load or zero load state.

In addition, reactive compensation system of the prior art mechanical switching capacitance or the switching reactance series capacitance modes of adopting more, the conventional design thinking is one or more parallel connection of 30Kvar.The reactive power of the described reactive power compensation device of the utility model is 35Kvar, can independently use, and also can expand many and use simultaneously, on capacity and standard, all improves a lot than prior art.

Above content is the explanation to the preferred embodiment of the utility model, can help those skilled in the art to understand the technical scheme of the utility model more fully.But these embodiment only illustrate, and can not assert that the embodiment of the utility model only limits to the explanation of these embodiment.Under the utility model, the those of ordinary skill of technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deductions and conversion, all should be regarded as belonging to the protection range of the utility model.

Claims

1. reactive power compensation device; Comprise rectifier bridge, capacitor, three reactors, said rectifier bridge links to each other with power supply, and said capacitor links to each other with rectifier bridge; Said three reactors parallel connection inserts electric power system; Between said capacitor and said three reactors, also be parallel with six igbts, said six igbts are parallelly connected with a diode reverse respectively; Break-make through controlling said six igbts can change the direct voltage on the said capacitor into the three-phase alternating voltage synchronous with power system voltage, it is characterized in that: said diode is high backward resistance point-contact diode.