CN2133086Y - Reactive automatic compensation controllor - Google Patents

Abstract

The utility model discloses a reactive automatic compensation controller controlled by a micro computer, comprising an electric current sampling element 1, a voltage sampling element 2, a phase detecting element 3, an operation control unit 4, a reactive compensation setting device 5, a driver 6, a capacitance compensation device 7, an electrical source 8 and a casing 9. The capacitance compensation device 7 comprises a basic compensation capacitor 701 and a regulating compensation capacitor 702. After the basic compensation capacitor 701 is directly connected with the load switch of an electricity loop which needs compensation and the regulating compensation capacitor 702 is connected with the general power supply switch of the distribution box of the electricity loop which needs compensation by an operation control contact tip 6021, the basic reactive compensator can be synchronously switched with load to really realize the goal of on-site compensation.

Description

Reactive automatic compensation controllor

The utility model relates to a kind of imaginary power automatic compensation controller with microcomputerized control, particularly relates to a kind of imaginary power automatic compensation controller that is suitable at final stage distribution box local compensation.

Chinese patent CN2052977 discloses a kind of " microcomputerized control power factor compensation instrument ", it is characterized in that dropping into and the excision compensation condenser, make power factor under the control of monolithic computer, obtain a stationary value according to the actual numerical value Automatic Cycle of power factor in the power circuit; Chinese patent CN2049034U also discloses a kind of " single chip microprocessor wattless power controller ", it is characterized in that single chip microcomputer is at dropping into the district, the excision district, the four kinds of situations in wave zone and stable region, judge comprehensively that according to reactive power and desired power factor that real-time detection of grid is required control compensation capacitor group drops into electrical network or excises from electrical network.But these idle compensating controls all are by control compensation capacitor group, according to measuring and calculating value substep it are dropped in the electrical network, and like this, when load repeatedly small variations took place, load or burden without work is and then fluctuation also, and drop into the capacitor group and tend to cause " vibration " this moment.Because each group compensation condenser will drop into a corresponding contactor of cover and an auxiliary accessories must be arranged all in the electrical network in addition, like this will be very big in reactive power compensation with the investment and the volume of the supporting compensation arrangement of idle compensating control, like this from just being difficult to adapt at the terminal needs of realizing local compensation of load with arranging to go up economically.

The purpose of this utility model is to provide a kind of to be suitable at the terminal novel imaginary power automatic compensation controller of realizing local compensation of load for the deficiency that solves above technology.

In order to achieve the above object, the designed imaginary power automatic compensation controller of the utility model comprises the current sample element, voltage sampling element, phase-detecting element, arithmetic and control unit, reactive power compensation setting apparatus, driver, capacitive compensator, power supply and housing.It is characterized in that capacitive compensator is by basic compensation condenser with regulate compensation condenser and form.Basic compensation condenser directly is connected on the electricity consumption loop that needs compensation, and regulating compensation condenser is to control contact by the compensation of arithmetic and control unit to be connected on the electricity consumption loop that needs compensation.In physical cabling in order to make load when putting into operation, just can realize the most basic compensation and the most basic energy-conserving action, what the utility model optimum was recommended is the different requirements of loading along separate routes according to each, basic compensation condenser is divided into the some groups of load side after directly being connected to each branch switch, make it to drop into synchronously with each branch switch, excision synchronously is to realize that need not increase controlling unit reaches basic compensation and basic purpose of energy saving with regard to the natural follow load variation of energy.Simultaneously, regulating compensation is on the basis of basic compensation, at the adjusting of carrying out owing to the needed compensation rate of variation of load, mends or owed to mend so that compensation rate is unlikely.Receive again on the circuit behind the total power switch of final stage distribution box so regulate compensation condenser and be by the compensation control contact of arithmetic and control unit.

According to the load variations rule, when electric current too hour is mended phenomenon and need temporarily be withdrawed under the situation of part compensation for preventing to produce, set input at arithmetic and control unit also can be provided with the current settings device, between the signal input part of current sample element and arithmetic and control unit, set up simultaneously the inspection fluid element, basic compensation condenser is connected to by the control contact of examining current control relay 603 again to be needed on the electricity consumption of the reactive power compensation loop, with the change of operational mode movingly certainly.

The utility model is divided into capacitive compensator basic compensation condenser and regulates compensation condenser, in whole reactive powers that its theoretical foundation is to load, it is constant substantially that a sizable part is always arranged, as in the running of motor no matter its load be underloading or fully loaded, itself almost is identical to the energy that power supply consumed, so this a part of reactive power compensation just there is no need to carry out repeatedly regulating and controlling.The switching that this a part of reactive power compensation just can be used as basic compensation and load is fixed up simultaneously.

In design, basic compensation rate is mended manyly more, and the adjusting compensation rate is just more little, and regulating action is just more little, and is just low more to s operation control and the requirement that drives the loop.But basic compensation rate is too big, just occurs the benefit phenomenon easily, and simultaneously used capacitor is also many more, and investment will increase.So the size of basic compensation rate is to consider to determine according to the different comprehensive benefit of above-mentioned relation and load character is unified.

Imaginary power automatic compensation controller described in the utility model because most of compensation condenser all is located in the shunt of circuit, utilizes branch switch to make most of reactive power compensation and the synchronous switching of load, has only small part to be subjected to the arithmetic and control unit regulating and controlling.Make load obtain most of reactive power compensation like this, make it not rely on arithmetic and control unit and just can realize basic energy-saving effect once dropping into.Because arithmetic and control unit only need be controlled at a spot of adjusting compensation, so arithmetic and control unit and drive the loop and only need adopt simple possible and economical and practical scheme to implement, like this, owing to adopted wiring and the simple small and exquisite structure simplified, make distribution box in final stage comprise that lighting case can realize local compensation easily.Make the utility model really to realize the purpose of local compensation, and reduced once investment widely that solved once investment and long-term energy-conservation contradiction, this will bring very big benefit to national economy at final stage distribution box.

Fig. 1 is an imaginary power automatic compensation controller architecture block diagram;

Fig. 2 is an imaginary power automatic compensation controller circuitry schematic diagram;

Fig. 3 is the program flow diagram that is fixed in the program storage device;

Fig. 4 is the elementary diagram that the imaginary power automatic compensation controller is used for power distributing cabinet;

Fig. 5 is the elementary diagram that the imaginary power automatic compensation controller is used for light distribution box;

Fig. 6 is the elementary diagram that the imaginary power automatic compensation controller is used for the unit distribution box;

Below in conjunction with accompanying drawing, the utility model will be further described by embodiment:

Embodiment 1:

As shown in Figure 1, the described imaginary power automatic compensation controller of present embodiment is by current sample element 1, voltage sampling element 2, phase-detecting element 3, arithmetic and control unit 4, reactive power compensation setting apparatus 5, driver 6, capacitive compensator 7, power supply 8 and housing 9 are formed, and capacitive compensator 7 is made up of basic compensation condenser 701 and adjusting compensation condenser 702, and its circuit theory diagrams as shown in Figure 2, current sample element 1 and voltage sampling element 2 convert electric current and voltage signal to a square-wave signal respectively and send into phase-detecting element 3, it converts the electric current of input and the phase difference of voltage signal and the corresponding pulse width signal of phase place size to again, here, and sampling element 1,2 and phase-detecting element 3 lump together and adopted 1m,339 four integrated comparators, the output of phase-detecting element 3 links to each other with the pulsewidth timing mouth 4018 of MCS-51 single-chip microcomputer 401 more then.Be solidified with the fixed routine of program circuit as shown in Figure 3 in the program storage device 403 in the arithmetic and control unit 4, make it relatively to export the signal of need compensation in driver 6 with corresponding phase place pulsewidth of phase difference and set point, driver 6 is the conducting condition shapes that decide triode 601 by the high-low level that single-chip microcomputer 401 is exported, with the operating state of decision A.C. contactor 602, finally whether with the compensation by its contact 6021 regulating and controlling compensation condensers 702.In use, basic compensation condenser 701 directly is connected on the electricity consumption loop that needs compensation, adjusting compensation condenser 702 is connected on the electricity consumption loop that needs compensation by the compensation control contact 6021 of arithmetic and control unit 4 again, make basic compensation condenser 701 and load switching synchronously, regulate compensation condenser 702 and drop into, to reach the purpose of this utility model by regulating control.

Embodiment 2:

Be the application example of the utility model in power distributing cabinet as shown in Figure 4, imaginary power automatic compensation controller described in the utility model is installed in the not level distribution box of required reactive power compensation, in the imaginary power automatic compensation controller, it is example at this with four groups that its basic compensation condenser 701 is divided into some groups, be respectively 7011,7012,7013,7014, four groups of basic compensation condensers are connected to respectively after each the load power switch along separate routes that needs reactive power compensation, after the contact 6021 of regulating the A.C. contactor 602 of compensation condenser 702 by being subjected to driver 6 controls is connected to the total power switch of power distributing cabinet again, like this along with the basic compensation condenser of each input of loading along separate routes also drops into automatically, to obtain the most basic reactive power compensation, situation according to the most basic reactive power compensation of each shunt, further regulate compensation again, to reach the purpose of the most energy-conservation local compensation of real realization by the idle test of general supply.After this directly is connected on on-load switch owing to compensation condenser, can allow frequently to suit and advantages such as anti-overvoltage and miniaturization so must possess, can select BCT type or BCMT type metallization self-healing low-voltage shunt capacitor for use at this.

Embodiment 3:

As shown in Figure 5, present embodiment is to introduce the operating position that is used for light distribution box when imaginary power automatic compensation controller described in the utility model, after each basic compensation condenser group still is connected to each branch switch that needs compensation, but because in illumination, except also having the switch of the lamp holder of being put in many shunt to have much the control in groups, its switching might not be synchronous with branch switch, daytime particularly, usually be that a large amount of electrical appliances have all been closed, branch switch still is in the "on" position of closing, and at this moment certainly will the benefit phenomenon will occur.For this reason, set input 4032 places of the arithmetic and control unit 4 in the imaginary power automatic compensation controller described in the utility model also are provided with current settings device 501, between the signal input part 4019 of current sample element 1 and arithmetic and control unit 4, also set up simultaneously inspection fluid element 10, adopt the ADC0809 integrated package at this inspection fluid element, also increasing in driver 6 has inspection stream controller 603, after basic compensation condenser is connected to a certain branch supply switch that needs to compensate again by the control contact 6031 of examining current control relay 603, by day, detection by the inspection fluid element, when load current during less than a certain value, control by arithmetic and control unit, thereby make 603 outages of inspection current control relay cut off basic compensation condenser, to prevent to produce the benefit phenomenon.

Embodiment 4:

Be the application example of present embodiment in the unit power distributing cabinet of big load as shown in Figure 6.In the unit power distributing cabinet of loading greatly, general supply service entrance switch and branch switch are the same same thing, so basic compensation condenser 701 and adjusting compensation condenser 702 all are to be connected on together on the way, but still are divided into two parts.Basic compensation condenser 901 directly is connected to behind the mains switch and the synchronous switching of load, and after regulating the contact 6021 of compensation condenser 702 by A.C. contactor 602 and being connected to mains switch again, (when load factor changes) required regulating action according to compensation when load variations.

Imaginary power automatic compensation controller described in the utility model can be stand alone type, also can with not level distribution box combination, in distribution box, be separately loading.

According to statistics, in the summation of the reactive loss of circuit, its transformer accounts for more than 90% of summation to the reactive loss of final stage distribution box at the transformer of distribution system.Therefore consider to compensate very difficultly with point at each, carry out the way that reactive power compensation is an optimum at final stage distribution box place.For a long time, be that investment is big around one of problem that realizes this way, it two is that volume is big, in fact is difficult to implement to making.The utility model has then carried out important improvement to the collocation structure of compensation condenser just, volume, performance, price, the contradiction between energy-conservation have been made it to solve basically, thereby make the final stage distribution box realize that local compensation really is achieved, and make the user when obtaining energy-saving effect, can also reduce the comprehensive method of investment, thereby the utlity model has very big practical value.

Claims (3)

1, a kind of imaginary power automatic compensation controller, it is made up of current sample element 1, voltage sampling element 2, phase-detecting element 3, arithmetic and control unit 4, reactive power compensation setting apparatus 5, driver 6, capacitive compensator 7 power supplys 8 and housing 9, it is characterized in that capacitive compensator 7 is made of basic compensation condenser 701 and adjusting compensation condenser 702, basic compensation condenser 701 directly is connected to and needs on the electricity consumption of the reactive power compensation loop, regulates the compensation control contact 6021 of compensation condenser 702 by arithmetic and control unit 4 and is connected to and needs on the electricity consumption of the reactive power compensation loop.

2, imaginary power automatic compensation controller according to claim 1, it is characterized in that the directly load side behind each branch switch of basic compensation condenser 701, after regulating the compensation control contact 6021 of compensation condenser 702 by arithmetic and control unit 4 and being connected to the total power switch of final stage distribution box again.

3, imaginary power automatic compensation controller according to claim 1 and 2, set input 4032 places that it is characterized in that described arithmetic and control unit 4, also be provided with current settings device 501, also set up simultaneously inspection fluid element 10 between the signal input part 4019 of current sample element 1 and arithmetic and control unit 4, basic compensation condenser 701 is connected to by the control contact 6031 of examining stream controller 603 to be needed in the electricity consumption of the reactive power compensation loop.

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