CN201966621U

CN201966621U - Mixed SVG

Info

Publication number: CN201966621U
Application number: CN2011200317901U
Authority: CN
Inventors: 何世江
Original assignee: GUIZHOU YIYUEXING ELECTRICAL Co Ltd
Current assignee: GUIZHOU YIYUEXING ELECTRICAL Co Ltd
Priority date: 2011-01-28
Filing date: 2011-01-28
Publication date: 2011-09-07
Anticipated expiration: 2021-01-28

Abstract

The utility model relates to the technical field of power grids and circuits and particularly discloses a mixed SVG (Static Var Generator), which comprises the SVG and a plurality of LC filter circuits in parallel connection with one another. In the utility model, the SVG and the plurality of LC filter circuits are adopted to form a circuit structure in parallel connection, so that reactive power compensation is improved, the efficacy generated by harmonic waves is effectively absorbed, the equipment cost can be maximally lowered, and the market popularization value is higher.

Description

A kind of mixed static reactive power generator

Technical field

The utility model relates to electrical network circuit engineering field, particularly a kind of mixed static reactive power generator.

Background technology

At present, arc furnace, the current conversion station in ultra high electric arc furnace especially in recent years, big section steel works milling train, the following high voltage direct current transmission, the common feature of the contour load equipment of electric unit are that power consumption is big, load fluctuation is big, three-phase imbalance, nonlinear load produces a large amount of harmonic waves etc.These loads are very serious to the harm that electrical network brings, and load variations causes the fluctuation and the flickering of line voltage tempestuously; The harmonic pollution that the harmonic wave of non-linear generation causes to electrical network causes the electronic equipment cisco unity malfunction even can occur damaging; Equipment eddy current loss and magnetic hysteresis loss that motor, transformer etc. contain ferrimagnet increase severely, and energy consumption increases, temperature increases, and these influences bring huge threat for the safe operation of equipment.

For burning voltage, eliminate flickering, cut down the consumption of energy, improve power supply quality, the harmonic content in the electrical network is limited in GB GB/T14549-93 " the quality of power supply utility network harmonic wave " limit value; Power factor (PF) is brought up to more than " State Grid Corporation of China's power system voltage quality and var administrative provisions "; Harmonic wave control is effectively carried out in the workplace of containing above similar devices, and reactive power compensation is imperative, and is very urgent.

The utility model content

(1) technical problem that will solve

The technical problems to be solved in the utility model be overcome traditional reactive power compensation device compensation inefficiency, make-up time slowly, shortcoming such as harmonic filtration DeGrain, components and parts useful life is short.

(2) technical scheme

In order to address the above problem, the utility model provides a kind of mixed static reactive power generator, comprising:

Described static reacance power generator and several LC filter circuits compose in parallel.

Further, described LC filter circuit is the series resonant circuit of being made up of instrument transformer, fuse, resonance reactor and capacitor; The high order harmonic component that exists in the resonance frequency of described resonant circuit and the network system is corresponding.

Further, also comprise circuit breaker, described LC filter circuit is connected with the electrical network circuit by circuit breaker.

Further, also comprise coupling transformer, described static reacance power generator is connected with the electrical network circuit by coupling transformer, realizes that the static reacance power generator of working under the low-voltage effectively connects with the high-voltage fence of different electric pressures.

Further, described coupling transformer is connected with the electrical network circuit by circuit breaker.

Further, described static reacance power generator comprises inverter, and described inverter is made up of switch cubicle, multipleization transformer, gate level turn-off thyristor, cooling-part, dc capacitor, step-up transformer, controllable silicon and control circuit.

Further, also comprise the lightning arrester that is used to eliminate the thunder and lightning interference.

(3) beneficial effect

The mixed static reactive power generator that the utility model provides, employing composes in parallel circuit structure with static reacance power generator and LC loop, can reach the raising reactive power compensation, effectively absorb the effect of each harmonic, reduced equipment cost again to greatest extent, the value of marketing is higher.

Description of drawings

Fig. 1 is the utility model embodiment mixed static reactive power generator electrical block diagram;

Fig. 2 is the utility model embodiment mixed static reactive power generator SVG circuit;

Fig. 3 is the utility model embodiment mixed static reactive power generator SVG main control part electrical schematic diagram.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.

As Figure 1-3, the utility model embodiment mixed static reactive power generator comprises: SVG (Static Var Generator, static reacance power generator) and several LC filter circuits compose in parallel.

Wherein, the LC filter circuit be used for compensating with filtering circuit in the harmonic wave and the idle component compensation of steady load, be specially the series resonant circuit of forming by instrument transformer TA, fuse FU, resonance reactor L and capacitor C; The high order harmonic component that exists in the resonance frequency of this resonant circuit and the network system is corresponding.Advantages such as the LC filter circuit has simple in structure, and components and parts are cheap.LC filter circuit concrete configuration quantity is determined according to the user is on-the-spot, is generally established 3-4 filtering channel.

Static reacance power generator SVG is mainly used in idle component jumpy and harmonic carcellation component in the compensation impact load.Static reacance power generator SVG comprises inverter, this inverter is by 10kV switch cubicle, multipleization transformer, GTO (Gate turn-off thyristor, gate level turn-off thyristor), cooling-part, direct current capacitor, step-up transformer, SCR (Silicon Controlled Rectifier, controllable silicon) and control circuit are formed.

After 10kV switch cubicle closure, multipleization transformer is the voltage that is complementary with GTO work with the 10kV voltage transformation, by GTO, cooling-part, direct current capacitor and control system, alternating current is converted into direct current.The SCR circuit is converted into direct current and system harmonics, harmful components equal and opposite in direction such as idle, current component that phase place is opposite, feeds back in the electrical network circuit through step-up transformer.In the whole service scope, SVG is adjustable continuously, and it is idle to have smooth adjustment, eliminates the function of each harmonic in the network system.

Wherein, this mixed static reactive power generator also comprises circuit breaker Q F and coupling transformer BT, the LC loop realizes switching on and off by circuit breaker and electrical network circuit, SVG is connected with the electrical network circuit by coupling transformer BT, realizes that the static reacance power generator of working under the low-voltage effectively connects with the high-voltage fence of different electric pressures.Usually below 1kV, more preferably, the end of this coupling transformer BT connects circuit breaker Q F to the operating voltage of SVG and coupling transformer BT link, is connected with the electrical network circuit by circuit breaker Q F, realizes switching on and off of SVG and electrical network circuit.

In addition, this generator also comprises the lightning arrester F that is used to eliminate the thunder and lightning interference.

The mixed static reactive power generator that the utility model provides, employing composes in parallel circuit structure with static reacance power generator and LC loop, can reach the efficient that improves reactive power compensation, the loss that reduces the idle component of circuit-line, reduce equipment cost again to greatest extent.

In actual applications, has good market popularization value.Specifically have following practical operation meaning:

(1) reduces line loss more than 50%.Saying that with regard to the whole nation line loss occupies 12% of national total installation of generating capacity approximately, wherein mainly is the loss that idle component causes, just can economize on electricity in 50%～60%, one year about 50,000,000,000 degree if idle line loss reduces, and is equivalent to 1/2nd of Three Gorges Projects energy output.In other words, by reactive power compensation effectively, under the prerequisite that does not consume primary energy, equal the newly-built green power plant that is equivalent to Three Gorges 1/2nd capacity.And invest minimum, instant effect.

(2) avoid fine.Regulation in China's Electricity Department and the pricing bureau " about issuing " power factor adjustment charge way " notice " when power factor 0.94, reduces the electricity charge 1.1%, increases the electricity charge 15% when power factor 0.6.The transformer of a 3150KVA for example, power factor is brought up to more than 0.94 ten thousand yuan of year rewarding and punishing difference 30-40 from 0.6.

(3) do not need additional investment, can directly realize dilatation.After carrying out reactive power compensation, just can improve the electricity consumption load-carry duty, but the transformer oepration at full load.Can only the offer high-quality service active power of 1890KW of the transformer of a 3150KVA for example, the transformer of power factor (PF) COS φ=0.6 load is held the capacity of can't stand about 3000KW, then need buy the transformer of a 5000KVA in addition and replace.Use the utility model HSVG power factor can be brought up to 0.98 by 0.6, be equivalent to enlarge 63%, the capacity that not only will gain merit and brought up to 3090KW but also can be satisfied the demand substantially by 1890KW has therefrom been saved the transformer of a 5000KVA, about three or four hundred ten thousand yuan of funds.

(4) improve the quality of power supply, prolonged appliance life, improved product quality.

Above execution mode only is used to illustrate the utility model; and be not to restriction of the present utility model; the those of ordinary skill in relevant technologies field; under the situation that does not break away from spirit and scope of the present utility model; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.

Claims

1. a mixed static reactive power generator is characterized in that, comprises that described static reacance power generator and several LC filter circuits compose in parallel.

2. mixed static reactive power generator as claimed in claim 1 is characterized in that, described LC filter circuit is the series resonant circuit of being made up of instrument transformer, fuse, resonance reactor and capacitor; The high order harmonic component that exists in the resonance frequency of described resonant circuit and the network system is corresponding.

3. mixed static reactive power generator as claimed in claim 1 is characterized in that, also comprises circuit breaker, and described LC filter circuit is connected with the electrical network circuit by circuit breaker.

4. mixed static reactive power generator as claimed in claim 1 is characterized in that, also comprises coupling transformer;

Described static reacance power generator is connected with the electrical network circuit by coupling transformer, realizes that the static reacance power generator of working under the low-voltage effectively connects with the high-voltage fence of different electric pressures.

5. mixed static reactive power generator as claimed in claim 4 is characterized in that, described coupling transformer is connected with the electrical network circuit by circuit breaker.

6. mixed static reactive power generator as claimed in claim 1, it is characterized in that, described static reacance power generator comprises inverter, and described inverter is made up of switch cubicle, multipleization transformer, gate level turn-off thyristor, cooling-part, dc capacitor, step-up transformer, controllable silicon and control circuit.

7. mixed static reactive power generator as claimed in claim 1 is characterized in that, also comprises being used to eliminate the lightning arrester that thunder and lightning disturbs.