CN203312817U - Low voltage reactive power compensating device - Google Patents

Abstract

A low voltage reactive power compensating device is disclosed, comprising a core control unit single-chip microcomputer controller, a reactive power compensation circuit, a power factor detection circuit, a bus tie switch detection circuit and a man-machine interface, wherein the ore control unit single-chip microcomputer controller is connected with the reactive power compensation circuit, the power factor detection circuit, the bus tie switch detection circuit and the man-machine interface; the single-chip microcomputer controller consists of a one-chip microcomputer chip and a peripheral circuit thereof; the reactive power compensation circuit comprises a reactive power compensation capacitor group consisting of a plurality of reactive power compensation capacitors and a fling-cut switch group consisting of a plurality of fling-cut switches; the power factor detection circuit consists of a group of a voltage transformer, multiple groups of current transformers, multiple wave filtering circuits, and A/D converters; the bus tie switch detection circuit comprises switching value detection devices which correspond to bus tie switches of an electric power system in number; the man-machine interface comprises a press key circuit and a display module which are respectively connected with I/O ports of the one-chip microcomputer chip. The reactive power compensating device is characterized by simple structure, and capability of realizing reactive power compensation of various kinds of low voltage electric power systems.

Description

A kind of low-voltage reactive compensator capable

Technical field

The utility model design generating or distribution technique field, be specifically related to a kind of reactive power compensation device.

Background technology

Along with industrial develop rapidly, people are more and more higher to the requirement of the quality of power supply.In order to improve the power factor of electric power system, reduce line loss, increasing power factor compensation device is applied in electric power system.Yet, the low-voltage reactive compensator capable adopted in current low-voltage power system is mostly for an inlet wire design, and then the power factor that this class reactive power compensator only can detect this bus point of incoming cables accesses the reactive power compensation that corresponding building-out capacitor is realized single inlet wire.Obviously, such reactive power compensator can't detect the power factor of many inlet wires, and flexibility is poor, can not adapt to the electric power system of most list mother partition and many buses.

Summary of the invention

In view of the deficiency of prior art, the utility model provides a kind of low-voltage reactive compensator capable, and this device can carry out reactive power compensation exactly for multiple electric power system.

The technical scheme that the utility model addresses the above problem is as follows:

A kind of low-voltage reactive compensator capable, this device comprise key control unit singlechip controller and connected reactive power compensation circuit, detection circuit of power factor, bus connection switch testing circuit and man-machine interface, it is characterized in that,

Described singlechip controller is comprised of singlechip chip and peripheral circuit thereof;

Described reactive power compensation circuit comprises the reactive compensation capacitor group of a plurality of compensation capacitors one-tenth and the fling-cut switch group that a plurality of fling-cut switch forms, wherein, on each fling-cut switch, all go here and there a fuse is arranged, the control end of each fling-cut switch is connected with an I/O mouth of singlechip chip respectively, and each reactive-load compensation capacitor is connected across between low pressure main bus bar and ground wire respectively with after a fling-cut switch is connected;

Described detection circuit of power factor by one group of voltage transformer, organize current transformer, a plurality of filter circuit and A/D converter more and form, wherein, voltage transformer is connected across between low pressure main bus bar and ground wire, each organizes the end of incoming cables that current transformer is socketed on respectively each low-voltage bus bar, voltage transformer and each current transformer are connected to respectively the input end of analog signal of corresponding A/D converter through filter circuit separately, the digital signal output end of each A/D converter is connected with the I/O mouth of singlechip chip respectively;

Described bus connection switch testing circuit comprise with electric power system in the corresponding switching value device of bus connection switch quantity, the output of each switching value device is connected with an I/O mouth of singlechip chip respectively;

Described man-machine interface comprises a key circuit and the display module be connected with the I/O mouth of singlechip chip respectively.

For the reliability and the use safety that guarantee electric power system and compensation arrangement, the output of described switching value device and the control end of each fling-cut switch can be connected to respectively the I/O mouth of singlechip chip through a photoelectrical coupler.

The beneficial effect of low-voltage reactive compensator capable provided by the utility model is:

This reactive power compensator can be by manually pressing key assignments or Single Chip Microcomputer (SCM) program setting means, by singlechip chip, detected magnitude of voltage, the inlet wire current value of each low-voltage bus bar and the switching of bus connection switch of low pressure main bus bar, according to the quantity of the bus connection switch of the closure detected and the inlet wire current of each low-voltage bus bar, calculate the power factor in the current power system, automatically by corresponding reactive-load compensation capacitor access electric power system in good time.This apparatus structure is simple, can realize the reactive power compensation to multiple low-voltage power systems such as single busbar connection, single mother partition and many buses.

The accompanying drawing explanation

Fig. 1 is the structured flowchart of a specific embodiment of a kind of low-voltage reactive compensator capable described in the utility model, Fig. 2 is the circuit structure block diagram of detection circuit of power factor described in Fig. 1, and Fig. 3～Fig. 5 is the circuit theory diagrams of described a kind of low-voltage reactive compensator capable of the present utility model.

Embodiment

This example is a kind of low-voltage reactive compensator capable that is applied to the electric power system of single mother partition provided by the utility model, as shown in Figure 1, this device comprises key control unit singlechip controller and connected reactive power compensation circuit, detection circuit of power factor, bus connection switch testing circuit and man-machine interface, wherein

As shown in Figure 2 and Figure 4, described detection circuit of power factor is by a voltage transformer T1 between the first bus that is connected across the low pressure main bus bar and ground wire, 2 current transformer TA1 and TA2 that are socketed on respectively the end of incoming cables of the first bus and the second bus, a plurality of filter circuits and be built in corresponding A in single-chip microcomputer U1/D transducer and form, wherein, voltage transformer T1 and each current transformer TA1, TA2 is connected to through separately filter circuit I/O mouth P0.0～P0.2 that single-chip microcomputer U1 has the A/D converter function respectively, by Single Chip Microcomputer (SCM) program, controlled the current detecting of the end of incoming cables of the first bus and the second bus, voltage detecting on the first bus,

As shown in Figure 3, the model that described singlechip controller is produced by U.S. Silicon Labs company is that 51 series monolithic chip U1 and the peripheral circuit thereof of C8051F580 forms, wherein, FLASH and up to 12 A/D converters of 200Ksps sampling rate on the sheet of the built-in 128k of this single-chip microcomputer;

As shown in Figure 5, described reactive power compensation circuit comprises reactive compensation capacitor group and 4 fling-cut switch group K1 that fling-cut switch forms that 4 reactive-load compensation capacitor C1～C4 forms, wherein, on each fling-cut switch, all go here and there a fuse F1～F4 is arranged, the model that the control end of each fling-cut switch is produced by Taiwan EVERLIGHT company by shown in Figure 3 one respectively is that photoelectrical coupler P1～P4 of TIL113 and photoelectric coupling circuit that peripheral circuit forms thereof are connected with the I/O mouth P3.4～P3.7 of singlechip chip, each reactive-load compensation capacitor C1～C4 respectively be connected across after a fling-cut switch is connected as the first bus of low pressure main bus bar and and ground wire between,

Referring to Fig. 1 and Fig. 5, due to native system, belong to the electric power system of single mother partition, therefore the bus connection switch testing circuit described in this example is a switching value device that detects the bus connection switch S2 that the first bus is connected with the second bus electric power, and the model that the output of this switching value device is produced via Taiwan EVERLIGHT company is that the photoelectrical coupler P5 of TIL113 and the photoelectric coupling circuit of peripheral circuit composition thereof are connected with the I/O mouth P3.3 of singlechip chip;

Referring to Fig. 3, described man-machine interface comprises a key circuit and a display module, wherein, described key circuit is that B3F-5050 key switch S3 and peripheral resistance R 6 are composed in series by the model that Japanese omron company produces, and this key circuit is connected across between the I/O mouth P0.4 and digital power ground of single-chip microcomputer U1; Liquid crystal display module U2 and peripheral circuit thereof that described display module is YM12864 by model form, the Interface for digital communication D1～D8 of this LCD MODULE, control interface RS, R/W ,/CS is connected with I/O mouth P2.0～P2.7, the P1.5～P1.7 of single-chip microcomputer U1 respectively.

This reactive power compensator that is applied to single mother partition electric power system can be set or the Single Chip Microcomputer (SCM) program setting means by button S3 is artificial, by singlechip chip U1, detect magnitude of voltage and waveform, the inlet wire current value of each low-voltage bus bar and the switching of waveform and bus connection switch S2 as low pressure main bus bar the first bus, whether inlet wire current parameter closed and each low-voltage bus bar is calculated the power factor in the current power system in good time according to bus connection switch S2, automatically by corresponding reactive-load compensation capacitor access electric power system.This apparatus structure is simple, in the situation that is incorporated into the power networks of avoided that a bus is stopped power supply, another bussed supply and bus connection switch closing, compensation arrangement can not the idle problem of effective compensation bus, after simultaneously also having solved bus connection switch and closing, article two, the original compensation arrangement on bus produces the compensation conflict, or only have the wall scroll bus that the problem that reactive power compensator can lose compensation is housed, also guaranteed the safe operation of equipment and personal safety.

Claims (2)

1. low-voltage reactive compensator capable, this device comprises key control unit singlechip controller and connected reactive power compensation circuit, detection circuit of power factor, bus connection switch testing circuit and man-machine interface, it is characterized in that,

Described singlechip controller is comprised of singlechip chip and peripheral circuit thereof;

Described reactive power compensation circuit comprises the reactive compensation capacitor group of a plurality of compensation capacitors one-tenth and the fling-cut switch group that a plurality of fling-cut switch forms, wherein, on each fling-cut switch, all go here and there a fuse is arranged, the control end of each fling-cut switch is connected with an I/O mouth of singlechip chip respectively, and each reactive-load compensation capacitor is connected across between low pressure main bus bar and ground wire respectively with after a fling-cut switch is connected;

Described detection circuit of power factor by one group of voltage transformer, organize current transformer, a plurality of filter circuit and A/D converter more and form, wherein, voltage transformer is connected across between low pressure main bus bar and ground wire, each organizes the end of incoming cables that current transformer is socketed on respectively each low-voltage bus bar, voltage transformer and each current transformer are connected to respectively the input end of analog signal of corresponding A/D converter through filter circuit separately, the digital signal output end of each A/D converter is connected with the I/O mouth of singlechip chip respectively;

Described bus connection switch testing circuit comprise with electric power system in the corresponding switching value device of bus connection switch quantity, the output of each switching value device is connected with an I/O mouth of singlechip chip respectively;

Described man-machine interface comprises a key circuit and the display module be connected with the I/O mouth of singlechip chip respectively.

2. a kind of low-voltage reactive compensator capable as claimed in claim 1, is characterized in that, the output of described switching value device and the control end of each fling-cut switch are connected to respectively the I/O mouth of singlechip chip through a photoelectrical coupler.

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