CN2341310Y

CN2341310Y - Static imaginary power compensator

Info

Publication number: CN2341310Y
Application number: CN 98207751
Authority: CN
Inventors: 王彰勉; 张学晋; 郭亚军; 赵志英; 胡野平; 高俊宏; 邵桓
Original assignee: 高俊宏; 邵桓
Priority date: 1998-08-10
Filing date: 1998-08-10
Publication date: 1999-09-29
Anticipated expiration: 2008-08-10

Abstract

The utility model relates to a static imaginary power compensator. The utility model is composed of a sampling controller, a detecting trigger, a switch control element of a compensation capacitor, the compensation capacitor, etc. The voltage difference delta U of both ends of the switch control element of the compensation capacitor is measured and is used as the judging condition of the switching opportunity of the switch control element of the compensation capacitor; the compensation capacitor can be connected into an electric network at any phase point of ac voltage and quits when the current exceeds a zero point, and the compensation capacitor is free from the restriction of the fluctuation of the ac voltage, the frequency offset, and the ac voltage phase point. The utility model has the advantages of no impulse current, no vibration noise, no spark, high response speed, and high operational reliability of the whole machine.

Description

The static reacance power compensating device

The utility model belongs to the reactive power compensation technical field, is specifically related to a kind of static reacance power compensating device.

Existing this type of device is by microcomputer and interface element basically, control contactor or thyristor valve increase and decrease the compensation condenser capacity, to reach compensating power, the purpose of power controlling factor, the utility model patent of having announced as the Patent Office of the People's Republic of China (patent No.: ZL92231732.1) because the thyristor in this compensator all carries out triggering and conducting with the burst pulse string after theoretical current zero-crossing point, that is to say at this and make the thyristor triggering and conducting constantly, and the prerequisite that does not produce impulse current is, should give charging to compensation condenser, voltage on it is given be charged to the electrical network crest voltage, could not produce impulse current at theoretical current zero-crossing point triggering and conducting thyristor like this, therefore the shortcoming of this compensator existence is that compensation condenser is in running order all the time, influence the useful life of capacitor, and occur rush of current when unavoidably starting shooting.

The purpose of this utility model is at deficiency of the prior art, provide a kind of can be at alternating voltage arbitrary phase point input compensation capacitor, and do not produce impulse current, do not produce spark, not influencing is container useful life, the static reacance power compensating device that performance is more superior.

The purpose of this utility model can realize by following measure: this device is by the sampling controller part, detection triggers partly, compensation condenser switching control element, compositions such as compensation condenser, at first sample circuit in the sampling controller and electrical network are joined by instrument transformer, the output signal of sample circuit is joined by A/D converter in the sampling controller and the microprocessor in the sampling controller, the output signal of microprocessor links to each other with optocoupler input in the detection triggers by the interface circuit in the sampling controller, the signal that sampling controller is given detection triggers is a digital signal, and this signal can be multichannel output, control several detection triggers as required, the signal of control detection trigger can also be that computer control system or other control system are sent simultaneously, and detection triggers is by resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, R ₇, R ₈, R ₉, diode D ₁, D ₂, D ₃, D ₄, triode P ₁, N ₁, N ₂, N ₃, N ₄, N ₅And optocoupler 01 interconnects composition, wherein D ₁Negative pole, D ₃Positive pole, R ₇An end, R ₃An end, R ₅An end, detection triggers dc supply positive pole, compensation condenser switching control element bidirectional thyristor T ₁Negative electrode link to each other R ₇The other end and N ₁3 ends of base stage optocoupler 01 link to each other R ₃The other end and N ₂Base stage, R ₆An end link to each other R ₆, the other end link to each other R with optocoupler output 4, detection triggers dc supply negative pole ₅The other end and N ₂Collector electrode link to each other R ₉An end and bidirectional thyristor T ₁Anode links to each other, the other end and D ₂Negative pole, D ₄Positive pole link to each other D ₁, D ₂Positive pole and R ₁An end link to each other R ₁The other end and P ₁Emitter links to each other, D ₃, D ₄Negative pole and P ₁Base stage, N ₁Collector electrode link to each other N ₁, N ₂Emitter and R ₄An end link to each other R ₄The other end and N ₄Base stage, N ₃Collector electrode link to each other N ₄Emitter and N ₄, N ₅Base stage link to each other N ₄, N ₅Collector electrode and R ₈An end link to each other R ₈The other end and bidirectional thyristor T ₁Trigger electrode-G ₁Link to each other P ₁Utmost point electrode and R ₂An end link to each other R ₂The other end and N ₃Base stage link to each other, 12 ends of optocoupler 01 link to each other with sampling controller.More than narration is the annexation of one tunnel detection triggers, and the annexation of other each road detection triggers and the above annexation are identical, and compensator adopts three (T ₁, T ₂, T ₃) bidirectional thyristor is as the control switching element of compensation condenser, compensation condenser can connect into the triangle table, but or star, compensation condenser single channel or multichannel, and can be detecting circuits for triggering and the integrated curing of bidirectional thyristor as a device, these detection circuits for triggering can trigger the capacitor control switching element that is equal to bidirectional thyristor simultaneously.

The utility model has the advantages that: (1) is used as the Rule of judgment on switching control element conducting opportunity of compensation condenser because of we the voltage difference delta U by the switching control element two ends of metrophia compensation capacitor, therefore compensation condenser can insert electrical network at alternating voltage arbitrary phase point, and out of service at current zero-crossing point, be not subjected to the fluctuation of alternating voltage and the constraint of frequency shift (FS) and alternating voltage phase point.(2) there is not the electric electric current of impact.(3) friction noise.(4) no-spark.(5) response speed is fast.(6) complete machine functional reliability height adopts this machine can save a large amount of electric weight, reduces the investment of power plant and electrical network.

The utility model has as follows

Fig. 1 is the detection triggers circuit diagram;

Fig. 2 is that compensator is the circuit diagram that triangle connects.

Be described in further detail by embodiment below in conjunction with accompanying drawing:

At first sample circuit in the sampling controller and electrical network are joined by instrument transformer, the A/D converter of the output signal of sample circuit by sampling controller links to each other with microprocessor in the sampling controller, the output signal of microprocessor links to each other with detection triggers by the interface circuit of sampling controller, microprocessor in the sampling controller is by the Signal Processing to being adopted by electrical network, come the operating state of control detection circuits for triggering according to the size of reactive power, a kind of static reacance power compensating device, include sampling controller, detection triggers, compensation condenser switching control element, compensation condenser; By instrument transformer sampling controller and electrical network are joined, the signal by sampling controller output enters by resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, R ₇, R ₈, R ₉, diode D ₁, D ₂, D ₃, D ₄, triode P ₁, N ₁, N ₂, N ₃, N ₄, N ₅And optocoupler 01 interconnects the detection triggers of composition, wherein D ₁Negative pole, D ₃Positive pole, R ₇An end, R ₃An end, R ₅An end, detection triggers dc supply positive pole, compensation condenser switching control element bidirectional thyristor T ₁Negative electrode link to each other R ₇The other end and N ₁3 ends of base stage optocoupler 01 link to each other R ₃The other end and N ₂Base stage, R ₆An end link to each other R ₆, the other end link to each other R with optocoupler output 4, detection triggers dc supply negative pole ₅The other end and N ₂Collector electrode link to each other R ₉An end and bidirectional thyristor T ₁Anode links to each other, the other end and D ₂Negative pole, D ₄Positive pole link to each other D ₁, D ₂Positive pole and R ₁An end link to each other R ₁The other end and P ₁Emitter links to each other, D ₃, D ₄Negative pole and P ₁Base stage, N ₁Collector electrode link to each other N ₁, N ₂Emitter and R ₄An end link to each other R ₄The other end and N ₄Base stage, N ₃Collector electrode link to each other N ₄Emitter and N ₅Base stage link to each other N ₄, N ₅Collector electrode and R ₅An end link to each other R ₈The other end and bidirectional thyristor T ₁Trigger electrode G ₁Link to each other P ₁Utmost point electrode and R ₂An end link to each other R ₂The other end and N ₃Base stage link to each other, 2 ends of optocoupler 01 link to each other with sampling controller, compensation condenser switching control element is T ₁, T ₂, T ₃Three bidirectional thyristors, compensation condenser are made triangle and are connected.

When reactive power transfinited, microprocessor just can send signal to detection triggers by interface circuit, came control compensation capacitor switching control element T by detecting circuits for triggering ₁, T ₂, T ₃Compensation condenser is put into operation, and when not needing to carry out reactive power compensation, microprocessor just can block output, makes T ₁, T ₂, T ₃Turn-off at current zero-crossing point, make building-out capacitor out of service, below we have a look connection and the working condition that detects circuits for triggering among Fig. 1, the ac of this circuit, a, G ₁Be connected with corresponding each point among Fig. 2 respectively, when the output 3 when 01 is high level, when promptly this circuit is not received the signal of being sent by the controlling of sampling circuit yet, we are that example is analyzed with the A loop at this, B, C loop are identical with A loop situation, 2 kinds of situations are arranged this moment, and (1) a, ac end has pressure reduction, at this moment P ₁, N ₁, N ₃Work, N ₂, N ₄, N ₅Do not work T ₁Can triggering and conducting; (2) the no pressure differential deltap U of a, ac end is zero, at this moment P ₁, N ₁, N ₃, N ₂, N ₄, N ₆All do not work T ₁Equally can triggering and conducting, when the output when 01 is low level, 2 kinds of situations, (1) a, ac two ends, P there are equally this moment ₁, N ₂, N ₃Work, N ₁And N ₄, N ₅Do not work T ₁Can triggering and conducting; (2) the no pressure reduction of a, ac end, P ₁, N ₁, N ₃Do not work, N ₂, N ₄, N ₅Work, T ₁Trigger end is received triggering signal, T ₁Triggering and conducting is worked as T ₁After the triggering and conducting, a, ac two ends are equivalent to short circuit, and this moment, triggering signal will be kept T always as long as 01 output keeps low level ₁Conducting, this triggering signal are direct current signal in this circuit, increase a part of circuit again and so long become pulse triggering signal to it, when sampling controller finishes when detect triggering the signal in loop N ₄, N ₅Can quit work, make T ₁Bidirectional thyristor turn-offs at current zero-crossing point, other loop works situation and A loop situation are identical, the bidirectional thyristor conducting in three loops depends on fully whether the pressure differential deltap U at the bidirectional thyristor two ends in this loop is whether zero-sum detection circuits for triggering work, and not influenced by other factors, what will say here a bit is if overvoltage appears in electrical network, improper situation such as phase shortage, sampling controller can be blocked output equally quits work detection triggers, makes compensation condenser out of service.

Claims

1, a kind of static reacance power compensating device includes sampling controller, detection triggers, compensation condenser switching control element, compensation condenser; By instrument transformer sampling controller and electrical network are joined, it is characterized in that: the signal by sampling controller output enters by resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, R ₇, R ₈, R ₉, diode D ₁, D ₂, D ₃, D ₄, triode P ₁, N ₁, N ₂, N ₃, N ₄, N ₅And optocoupler 01 interconnects the detection triggers of composition, wherein D ₁Negative pole, D ₃Positive pole, R ₇An end, R ₃An end, R ₅An end, detection triggers dc supply positive pole, compensation condenser switching control element bidirectional thyristor T ₁Negative electrode link to each other R ₇The other end and N ₁Base stage, 3 ends of optocoupler 01 link to each other, R ₃The other end and N ₂Base stage, R ₆An end link to each other R ₆, the other end link to each other R with optocoupler output 4, detection triggers dc supply negative pole ₅The other end and N ₂Collector electrode link to each other R ₉An end and bidirectional thyristor T ₁Anode links to each other, the other end and D ₂Negative pole, D ₄Positive pole link to each other D ₁, D ₂Positive pole and R ₁An end link to each other R ₁The other end and P ₁Emitter links to each other, D ₃, D ₄Negative pole and P ₁Base stage, N ₁Collector electrode link to each other N ₁, N ₂Emitter and R ₄An end link to each other R ₄The other end and N ₄Base stage, N ₃Collector electrode link to each other N ₄Emitter and N ₅Base stage link to each other N ₄, N ₅Collector electrode and R ₈An end link to each other R ₈The other end and bidirectional thyristor T ₁Trigger electrode G ₁Link to each other P ₁Utmost point electrode and R ₂An end link to each other R ₂The other end and N ₃Base stage link to each other, 12 ends of optocoupler 01 link to each other with sampling controller, compensation condenser switching control element is T ₁, T ₂, T ₃Three bidirectional thyristors, compensation condenser are made triangle and are connected.

2, static reacance power compensating device as claimed in claim 1, it is characterized in that: wherein compensation condenser also can be done Y-connection.

3, quiet five reactive power compensation devices as claimed in claim 1 is characterized in that: detection triggers circuit and building-out capacitor switching control element can integrated curing as an element.