CN203103971U - Power grid reactive power compensation device with protection function - Google Patents

Abstract

The utility model relates to a power grid reactive power compensation device with a protection function. The power grid reactive power compensation device with the protection function comprises a power supply module, an energy taking module, a photoelectric interface module which comprises a light receiving circuit unit and a light emitting circuit unit, a controller which is used for adjusting the switching angle of a reactor according to the reactive power amount in a power grid, a trigger module which is connected with the thyristor gate and amplifies and converts a synchronous current signal into current pulse which drives the thyristor gate, and a trigger feedback module which is used for acquiring voltage on both ends of the thyristor and the gate voltage to generate a voltage state feedback signal. The power supply module comprises a transformer and a first diode. The voltage from mains supply undergoes step-down of the transformer and then undergoes positive half cycle removing of the first diode, and thus direct current voltage is acquired. A branch which is formed by connecting an eighth resistor, a ninth resistor and a fifth capacitor in series is connected with the input end of the transformer, wherein the eighth resistor and the ninth resistor are connected in parallel. According to the utility model, the power grid reactive power compensation device with the protection function can return a thyristor trigger state to a control system, is convenient for real-time monitoring and protection, and has the advantages of precise trigger, good stability and low power consumption.

Description

Electric network reactive compensation device with defencive function

Technical field

The utility model relates to a kind of electric network reactive compensation device with defencive function, belongs to electric network reactive compensation device technique field.

Background technology

In order to satisfy the requirement of remote big capacity transmission of electric energy in recent years, transmission voltage is more and more higher in the prior art; The scale of electric power system is increasing, the energy output sustainable growth; Show outstanding problem day because the lack of uniformity of China's energy and Load distribution, the dynamic reactive power in the electrical network support, the power delivery ability is restricted.Owing to a large amount of uses of large capacity single phase load and unbalanced load, the three-phase imbalance problem of electrical network is day apparent giving prominence to also simultaneously.For administering the problems referred to above, in electric power system, to introduce reactive power compensator and carry out reactive power compensation, magnet controlled reactor (MCR) is to use always always, it is bringing into play important effect aspect dynamic reactive support, the improvement electrical network three-phase imbalance.Compare with active equipment, it is having huge advantage aspect stability and the compensation capacity.Wherein, the reliable triggering of thyristor is one of key technology of whole device.Thyristor triggering mode commonly used at present has electromagnetism triggering mode, photoelectricity triggering mode and light triggering mode.Traditional electromagnetism triggering mode can't be monitored the triggering state of thyristor in real time, can't accurately grasp in real time the triggering situation of reality, is not easy to realize that the accuracy that triggers reaches the protection to thyristor.

Summary of the invention

The purpose of this utility model provides a kind of electric network reactive compensation device with defencive function; this electric network reactive compensation device can return control system with thyristor triggering state; conveniently monitor in real time and protect, have trigger accurately, good stability, the little advantage of power consumption.

For achieving the above object, the technical solution adopted in the utility model is: a kind of electric network reactive compensation device with defencive function comprises reactor and the thyristor that is used to control reactor switching angle;

Connect the power module of civil power, be used to receive electric energy from electrical network;

Get the energy module, be used for the alternating current from power module is converted into direct current;

The optic electric interface module, it comprises optical receiving circuit unit and optical transmission circuit unit, the light pulse signal that the optical receiving circuit unit is used for fetching self-controller is converted into the synchronizing current signal; The optical transmission circuit unit is used for giving described controller with being converted into optical signal transmission from the voltage status feedback signal that triggers feedback module;

Be connected to the controller of optic electric interface module, be used for adjusting described reactor switching angle according to the idle amount of electrical network;

Be connected to the trigger module of described gate circuit transistor gate, the synchronizing current signal amplified the current impulse that is converted to the driving gate circuit transistor gate;

Trigger feedback module, thereby be used to gather the voltage and the gate voltage formation voltage state feedback signal at described thyristor two ends;

Described power module comprises transformer and the 1st diode, described transformer will obtain direct voltage from removing positive half cycle through described the 1st diode again after the voltage step-down of civil power, and a branch road by the 8th resistance in parallel and the 9th resistance and the 5th capacitances in series is connected to the input of transformer;

By getting of first voltage-stabiliser tube, second voltage-stabiliser tube series connection can module in the first voltage-stabiliser tube output as first output, the second voltage-stabiliser tube output is as second output;

Described optic electric interface module, the light pulse signal that is used for fetching self-controller is converted into the synchronizing current signal.

Further improvement project is as follows in the technique scheme:

In the such scheme, also comprise a protection trigger module, this protection trigger module is between described triggering feedback module and thyristor, according to adjusting described thuristor working state from triggering feedback module voltage status feedback signal.

Because the technique scheme utilization, the utility model compared with prior art has following advantage and effect:

The utlity model has the electric network reactive compensation device of defencive function, it is positioned at the electrical network hot side, gate circuit transistor gate and optic electric interface module are provided with trigger module, use optical fiber to finish the isolation of signal transmission and high electronegative potential, on pulse quality still is isolation performance, all be better than the equipment of electromagnetism triggering mode; Secondly, the utility model circuit design can obtain the working power stable, that ripple is little by the slave unit primary side, in more abominable electromagnetic environment, overcome the strong electromagnetic that circuit is caused of cut-offfing of big electric current in the main circuit, thyristor, have certain interference free performance; Once more, the utility model electric network reactive compensation device, its branch road by the 8th resistance in parallel and the 9th resistance and the 5th capacitances in series is connected to the input of transformer, can prevent that the vibration that supply voltage sudden change produces from damaging thyristor.

Description of drawings

Accompanying drawing 1 is for the utlity model has the electric network reactive compensation device electrical diagram of defencive function;

Accompanying drawing 2 is the utility model power module structural representation;

Accompanying drawing 3 is got for the utility model can the modular structure schematic diagram.

In the above accompanying drawing: 1, reactor; 2, thyristor; 3, power module; 4, get the energy module; 5, optic electric interface module; 51, optical receiving circuit unit; 52, optical transmission circuit unit; 6, controller; 7, trigger module; 8, trigger feedback module; 9, protection trigger module.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment: a kind of electric network reactive compensation device with defencive function comprises reactor 1 and the thyristor 2 that is used to control reactor 1 switching angle;

Connect the power module 3 of civil power, be used to receive electric energy from electrical network;

Get energy module 4, be used for the alternating current from power module 3 is converted into direct current;

Optic electric interface module 5, it comprises optical receiving circuit unit 51 and optical transmission circuit unit 52, the light pulse signal that optical receiving circuit unit 51 is used for fetching self-controller 6 is converted into the synchronizing current signal; Optical transmission circuit unit 52 is used for giving described controller 6 with being converted into optical signal transmission from the voltage status feedback signal that triggers feedback module;

Be connected to the controller 6 of optic electric interface module 5, be used for adjusting described reactor 1 switching angle according to the idle amount of electrical network;

Be connected to the trigger module 7 of described thyristor 2 gate poles, the synchronous signal of telecommunication amplified the current impulse that is converted to driving thyristor 2 gate poles;

Trigger feedback module 8, thereby be used to gather the voltage and the gate voltage formation voltage state feedback signal at described thyristor 2 two ends;

Described power module 3 comprises transformer T1 and the 1st diode D1, described transformer T1 will obtain direct voltage from removing positive half cycle through described the 1st diode D1 again after the voltage step-down of civil power, and a branch road by the 8th resistance in parallel and the 9th resistance and the 5th capacitances in series is connected to the input of transformer T1;

By getting of the first voltage-stabiliser tube U1, second voltage-stabiliser tube U2 series connection can module 4 in the first voltage-stabiliser tube U1 output as first output, the second voltage-stabiliser tube U2 output is as second output;

Described optic electric interface module 5, the light pulse signal that is used for fetching self-controller 6 is converted into the synchronizing current signal.

One protection trigger module 9, this protection trigger module 9 are between described triggering feedback module 8 and thyristor 2, according to adjusting described thyristor 2 operating states from triggering feedback module 8 voltage status feedback signals.

The present embodiment electric network reactive compensation device course of work is as follows.

Power module is realized hypotensive effect by a little transformer module T1, and removing positive half cycle by diode D1 is direct voltage, and capacitor C 1 is carried out filter action.

Wherein get the energy module by voltage-stabiliser tube U1, U2, capacitor C 2, C3 and resistance R 1, R2 and two light-emitting diodes constitute, and the direct voltage that power module produces produces 12V voltage through U1, are that triode Q1, Q2 power after C2 filtering.The 5V voltage that the voltage that U1 produces produces through U2 after capacitor C 3 filtering, for optical receiver HFBR-2412 and Q3 power supply and draw high Q3 voltage, LED2 connect with R2 instigate the 5V power supply get the energy result.

Wherein the optic electric interface module mainly is made of core devices HFBR-2412 optical receiver, and the reception light pulse is converted into the signal of telecommunication and exports with positive logic.

The utility model is in operation, and power module is from hot side, and promptly the equipment primary side is obtained the required power supply of system works; Described optic electric interface module receives the light pulse from the control system optical-fibre channel, i.e. light signal, and be converted into the signal of telecommunication; By the subsequent triggers circuit weak pulse is converted to the satisfied requirement that triggers towards the signal amplification, the current impulse of enough amplitudes is arranged, output to the gate leve of thyristor, be used for triggering the thyristor valve group.

Owing to adopted above technical scheme, the beneficial effects of the utility model are: the operating current of (1) circuit board own is little, low in energy consumption, and main circuit work is not had influence substantially; (2) owing to adopted the protection circuits for triggering can protect thyristor, prevent that it is by over-voltage breakdown; (3) owing to adopted the photoelectricity triggering mode to realize synchronism, accuracy and the promptness of triggering signal; (4) owing to adopted the triggering feedback circuit, thyristor triggering state can be returned control system, conveniently monitor in real time and protect; (5) cost is low, and hardware circuit is simple, is easy to realize.

The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection range of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the present utility model.

Claims (2)

1. electric network reactive compensation device with defencive function is characterized in that: comprise reactor (1) and be used to control the thyristor (2) of reactor (1) switching angle;

Connect the power module (3) of civil power, be used to receive electric energy from electrical network;

Get energy module (4), be used for the alternating current from power module (3) is converted into direct current;

Optic electric interface module (5), it comprises optical receiving circuit unit (51) and optical transmission circuit unit (52), the light pulse signal that optical receiving circuit unit (51) are used for fetching self-controller (6) is converted into the synchronizing current signal; Optical transmission circuit unit (52) is used for giving described controller (6) with being converted into optical signal transmission from the voltage status feedback signal that triggers feedback module;

Be connected to the controller (6) of optic electric interface module (5), be used for adjusting described reactor (1) switching angle according to the idle amount of electrical network;

Be connected to the trigger module (7) of described thyristor (2) gate pole, the synchronizing current signal amplified the current impulse that is converted to driving thyristor (2) gate pole;

Trigger feedback module (8), be used to gather described thyristor (2) thereby the voltage at two ends and gate voltage formation voltage state feedback signal;

Described power module (3) comprises transformer and the 1st diode, described transformer will obtain direct voltage from removing positive half cycle through described the 1st diode again after the voltage step-down of civil power, and a branch road by the 8th resistance in parallel and the 9th resistance and the 5th capacitances in series is connected to the input of transformer;

By getting of first voltage-stabiliser tube, second voltage-stabiliser tube series connection can module (4) in the first voltage-stabiliser tube output as first output, the second voltage-stabiliser tube output is as second output;

Described optic electric interface module (5), the light pulse signal that is used for fetching self-controller (6) is converted into the synchronizing current signal.

2. electric network reactive compensation device according to claim 1; it is characterized in that: also comprise a protection trigger module (9); this protection trigger module (9) is positioned between described triggering feedback module (8) and the thyristor (2), according to adjusting described thyristor (2) operating state from triggering feedback module (8) voltage status feedback signal.

Images