CN201656480U

CN201656480U - Active filter and reactive power compensation device

Info

Publication number: CN201656480U
Application number: CN2010201541469U
Authority: CN
Inventors: 吴敏杰; 朱频萍
Original assignee: JIANGSU HUAFENG ELECTRICAL APPLIANCE CONTROL EQUIPMENT CO Ltd
Current assignee: JIANGSU HUAFENG ELECTRICAL APPLIANCE CONTROL EQUIPMENT CO Ltd
Priority date: 2010-04-08
Filing date: 2010-04-08
Publication date: 2010-11-24
Anticipated expiration: 2020-04-08

Abstract

The utility model relates to an active filter and reactive power compensation device. An upper pile head of an isolating switch (1) of the active filter and reactive power compensation device is connected to a lower pile head of a power grid, a lower pile head of the isolating switch (1) is connected with an upper pile of a fuse (2) via a lead, a lower pile of the fuse (2) is connected with a silicon controlled module (3), a lower pile of the silicon controlled module (3) is connected with a capacitor (4), an IGB driver is connected with the silicon controlled module (3) and transmits signals to break over the silicon controlled module (4) so that the capacitor (4) runs, and a data acquisition controller is connected with the silicon controlled module (3) and quickly generates current with intensity equal to that of current generated by the silicon controller module and direction opposite to the current generated by the silicon controller module to offset the current generated by the same, thereby canceling harmonic waves. The active filter and reactive power compensation device is based on the technology of high-speed filter compensation, cancels various harmonic waves, can be applied to various work conditions polluted by harmonic waves and particularly applied to quick changing load, and can automatically change compensation capability according to reactive power change of a system, thereby achieving the best compensation effect.

Description

Active filtering reactive power compensation device

Technical field

The utility model type relates to a kind of filter reactive compensation device, relates in particular to a kind of active filtering reactive power compensation device.

Background technology

The former design of active filtering reactive power compensation device adopts the LC passive filter to come the filtering harmonic wave, adopts power capacitor, SVC to carry out reactive power compensation.There is following defective in its LC filter: volume is big, and loss is big, needs a large amount of non-ferrous metals simultaneously, the waste resource; Fixed compensation can only be carried out, the harmonic wave that voltage fluctuation, voltage flicker and three-phase imbalance can only suppress fixed frequency can not be suppressed; Can resonance take place under certain condition and certain subharmonic is amplified, even have an accident; Filtering characteristic is influenced greatly by system parameters; There is the overload problem.Also there is following defective in reactive-load compensation equipment: response speed is slow; Compensation rate is a discrete magnitude, can't full remuneration; System harmonics can be amplified; Resonance might take place, and causes system's instability.

As shown in Figure 1, LC passive filter filtering harmonic wave is adopted in former design.Series resonance is that L, C are when certain frequency current, the resonance that takes place: at this moment, L, C series loop are that zero (the induction reactance size equals the capacitive reactance size to the impedance of this primary current, and direction is opposite), to this primary current short circuit, at this moment this subharmonic current flows through nearly all from here, the principle of Here it is passive filtering.The method is to provide a short-channel to harmful harmonic wave, in this passage, only consumes some harmonic energies on the D.C. resistance of itself, and major part also all flows in harmonic source and this L, C short-channel.

The utility model content

1, technical problem to be solved:

Provide a kind of filtering and reactive power compensation all more stable active filtering reactive power compensation device at above not enough the utility model type.

2, technical scheme

A kind of active filtering reactive power compensation device, the following pile crown of pile crown connection and electrical network on its isolating switch, pile crown is by stake on lead connection and the fuse under the isolating switch, following of fuse connects silicon controlled module, following connection capacitor of silicon controlled module, the IGB driver links to each other with silicon controlled module, the IGB driver sends signal and gives the silicon controlled module conducting, make capacitor work, data acquisition controller links to each other with silicon controlled module, data acquisition controller generates with it the electric current of opposite sign but equal magnitude fast and is offset, and is used for harmonic carcellation.

3, beneficial effect

The utility model is eliminated various forms of harmonic waves based on filtering compensation technology at a high speed, can be applicable to various operating modes at harmonic pollution, is particularly useful for fast-changing load; Can be automatically change compensation capacity, thereby reach best compensation effect according to the variation of system's reactive power.

Description of drawings

Fig. 1 is the schematic diagram of existing active filtering reactive power compensation device;

Fig. 2 is a schematic diagram of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.

As shown in Figure 2, the following pile crown of pile crown connection and electrical network on the isolating switch 1 of active filtering reactive power compensation device, 1 time pile crown of isolating switch is by stake on lead connection and the fuse 2,2 times stakes of fuse connect silicon controlled module 3,3 times stakes of silicon controlled module connect capacitor 4, and the IGB driver links to each other with silicon controlled module 3, and worker GB driver sends signal and gives silicon controlled module 3 conductings, make capacitor 4 work, capacitor is that bucking voltage reduces idle loss in system.Data acquisition controller links to each other with silicon controlled module 3, and data acquisition controller generates with it the electric current of opposite sign but equal magnitude fast and offset, and is used for harmonic carcellation, avoids system voltage, current waveform to take place abnormal.Fuse is to do the protection effect when any element breaks down in the whole system in order to protect.

Active filtering reactive power compensation device is in parallel with harmonic source, follows the tracks of the harmonic current that the harmonic source load produces by real-time detection, and device has adaptation function, can compensate frequency and the big or small harmonic wave that all changes, and target compensation is had the response that is exceedingly fast.Be installed on the complete set of equipments and can carry out the voltage power-less Comprehensive Control,, improve the supply power voltage quality, reduce electric energy loss to satisfy the power system reactive power equilibrium of supply and demand to system.This device can be automatically changes compensation capacity according to the variation of system's reactive power, thereby reaches best compensation effect.

Though the utility model with preferred embodiment openly as above; but they are not to be used for limiting the utility model; anyly have the knack of this skill person; in the spirit and scope that do not break away from the utility model; can do various variations or retouching from working as, what therefore protection range of the present utility model should be defined with the application's claim protection range is as the criterion.

Claims

1. active filtering reactive power compensation device, it is characterized in that: its isolating switch (1) is gone up the following pile crown of pile crown connection and electrical network, isolating switch (1) pile crown down connects and upward stake of fuse (2) by lead, following of fuse (2) connects silicon controlled module (3), following connection capacitor of silicon controlled module (3) (4), the IGB driver links to each other with silicon controlled module (3), the IGB driver sends signal and gives silicon controlled module (3) conducting, make capacitor (4) work, data acquisition controller links to each other with silicon controlled module (3), data acquisition controller generates with it the electric current of opposite sign but equal magnitude fast and is offset, and is used for harmonic carcellation.