CN103269071A - Load unbalance compensation system - Google Patents
Load unbalance compensation system Download PDFInfo
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- CN103269071A CN103269071A CN2013102240325A CN201310224032A CN103269071A CN 103269071 A CN103269071 A CN 103269071A CN 2013102240325 A CN2013102240325 A CN 2013102240325A CN 201310224032 A CN201310224032 A CN 201310224032A CN 103269071 A CN103269071 A CN 103269071A
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Abstract
The invention discloses a load unbalance compensation system comprising a current sensor, a voltage sensor, a low-pass filter, a first DSP (digital signal processor) chip, a touch screen, a second DSP chip, an FPGA (field programmable gate array) chip, a communication interface and an inverter, wherein the current sensor and the voltage sensor are connected with the input end of the low-pass filter; the output end of the low-pass filter, the first DSP chip, the FPGA chip and the inverter are sequentially connected; the touch screen and the second DSP chip are connected with the first DSP chip; and the communication interface is connected with the second DSP chip. The load unbalance compensation system disclosed by the invention is suitable for a three-phase four-wire system supply network which utilizes a single-phase load as a main load, fast in reaction speed, and high in accuracy; a stable and fast three-phase balance control effect can be obtained; neutral wire electricity of a low-voltage power distribution system is removed; and comprehensive compensation of reactive power and negative sequence components of the system is achieved.
Description
Technical field
The present invention relates to a kind of laod unbalance bucking-out system, belong to electric power low-voltage distribution network technical field.
Background technology
The load of the distribution transformer of low voltage electric network is generally mixed with single-phase load by three-phase load and forms, residential electricity consumption is single-phase load, along with socio-economic development, improving constantly of living standards of the people, a large amount of high-power household electrical appliance such as air-conditioning, electric heater, electric cooker, microwave oven, baking box etc. enter family.Because the maldistribution of three-phase load in the three phase and four wire circuit system, the use of adding load is asynchronous, randomness is big, has caused distribution transformer to be in threephase load unbalanced operation state constantly.This not only increases line loss and distribution loss, also can cause the imbalance of circuit three-phase voltage, and the threephase load unbalanced operation has a significant impact low voltage electric network, the quality of power supply and power supply quality are seriously influenced, also can accelerate simultaneously the aging of distribution transforming, reduce the situation of exerting oneself of distribution transformer.
Harm to transformer: the three-phase load imbalance will make transformer be in the asymmetric operation state, thereby cause the loss of transformer to increase.According to transformer operating standard regulation, the transformer neutral current that is in operation can not surpass 25% of step down side rated current.In addition, the three-phase load imbalance can cause the transformer zero-sequence current excessive, and the part metals part heats up to be increased, even causes transformer to burn.
The neutral line and neutral point voltage problem: neutral line zero-sequence current is excessive, causes that the neutral line burns, and causes neutral point voltage to be offset problems such as excessive.
Harm to power consumption equipment: imbalance of three-phase voltage will make that contrary moment of torsion increases in the motor, thereby cause motor to heat up decrease in efficiency, phenomenons such as energy consumption increase.Therefore the imbalance of three-phase voltage can cause power consumption equipment shortening in useful life, and acceleration equipment part replacement frequency increases cost of equipment maintenance.
The best phase-splitting reactive compensation system of compensation effect compensates load in the market, also the reactive current in the network system partly can only be mended, and it is helpless for asymmetric active current part, sometimes but make the degree of unbalance of electric current might be bigger after the reactive power compensation, so the electric industry power supply department can only adopt the adjustment of loading of the mode of artificial separated time.
From the above, the three-phase imbalance of using electricity system is very serious to harm and the influence of transformer, electric equipment and using electricity system, especially fully effectively utilizing of electric power energy is constituted great obstacle.In supply of electric power today in short supply, the three-phase imbalance problem that solves using electricity system has been extremely urgent task.How adopting rational equipment to solve the unbalanced problem of low voltage electric network threephase load, is to improve safe operation of electric network and one of important development direction that reduces the wastage.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and kind of an a kind of laod unbalance bucking-out system is provided, being suitable for the single-phase load is the three-phase four-wire power supply net of main load, three-phase load can be effectively improved and caused electric energy loss and equipment damage can not be divided equally, reaction speed is fast, the precision height, can obtain the stable control of three-phase equilibrium fast effect, eliminate the low-voltage distribution system neutral current, realize the comprehensive compensation of system's reactive power and negative sequence component.
The technical scheme that realizes above-mentioned purpose is: a kind of laod unbalance bucking-out system comprises current sensor, voltage sensor, low pass filter, the one DSP(Digital Signal Processor, Digital Signal Processing) chip, touch-screen, second dsp chip, FPGA(Field Programmable Gate Array, field programmable gate array) chip, communication interface and inverter, described current sensor all links to each other with the input of described low pass filter with voltage sensor, the output of described low pass filter, first dsp chip, fpga chip links to each other successively with inverter, described touch-screen all links to each other with described first dsp chip with second dsp chip, described communication interface links to each other with described second dsp chip, wherein:
Described current sensor and voltage sensor are gathered current signal and the voltage signal of load circuit respectively, and current signal and the voltage signal gathered are passed to described low pass filter;
Described low pass filter carries out the filtering processing to current signal and the voltage signal that receives, and current signal and the voltage signal handled through filtering are delivered to first dsp chip;
Described first dsp chip carries out analytical calculation to current signal and the voltage signal handled through filtering that receives, and needing to obtain the current signal of compensation, and the current signal of needs compensation is sent to described fpga chip;
Described fpga chip produces pwm pulse signal according to the current signal of the needs compensation that first dsp chip sends, and PWM(Pulse Width Modulation, pulse width modulation) pulse signal flows to described inverter;
Described inverter is according to each electric current that need compensate mutually of pwm pulse signal output.
In above-mentioned a kind of laod unbalance bucking-out system, described inverter comprises three-phase four-arm inverter circuit, four inductance and an electric capacity, described three-phase four-arm inverter circuit is made up of four brachium pontis parallel with one another, each brachium pontis is made up of two switching tube series aiding connections, the series connection intermediate connection point is each bridge output, and two ends that join of four brachium pontis parallel connections connect the input of described three-phase four-arm inverter circuit respectively; The input of described four inductance links to each other with each bridge output of described three-phase four-arm inverter circuit respectively, and the output of described four inductance links to each other with load; Described electric capacity is in parallel with each brachium pontis of described three-phase four-arm inverter circuit, and links to each other with the input of three-phase four-arm inverter circuit.
In above-mentioned a kind of laod unbalance bucking-out system, described switching tube is the IGBT of band inverse parallel diode.
The invention has the beneficial effects as follows: being suitable for the single-phase load is the three-phase four-wire power supply net of main load, three-phase load can be effectively improved and caused electric energy loss and equipment damage can not be divided equally, reaction speed is fast, the precision height, can obtain the stable control of three-phase equilibrium fast effect, eliminate the low-voltage distribution system neutral current, realize the comprehensive compensation of system's reactive power and negative sequence component, reach the energy-saving and emission-reduction purpose, effectively energy savings loss.
Description of drawings
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is partial electrical schematic diagram of the present invention.
Embodiment
In order to make those skilled in the art can understand technical scheme of the present invention better, below in conjunction with accompanying drawing its embodiment is described in detail:
See also Fig. 1, laod unbalance bucking-out system of the present invention comprises current sensor 1, voltage sensor 2, low pass filter 3, first dsp chip 4, touch-screen 8, second dsp chip 5, fpga chip 6, communication interface 9 and inverter 7, current sensor 1 all links to each other with the input of low pass filter 3 with voltage sensor 2, the output of low pass filter 3, first dsp chip 4, fpga chip 6 link to each other successively with inverter 7, touch-screen 8 all links to each other with first dsp chip 4 with second dsp chip 5, and communication interface 9 links to each other with second dsp chip 5.
See also Fig. 2 again, inverter 7 comprises three-phase four-arm inverter circuit, inductance L
1, inductance L
2, inductance L
3, inductance L
4With a capacitor C 1, the three-phase four-arm inverter circuit is made up of four brachium pontis parallel with one another, comprises eight switch transistor T altogether
1～T
8, each brachium pontis is made up of two switching tube series aiding connections, and series connection intermediate connection point a, b, c, n are each bridge output, T
1, T
3, T
5, T
7The common port that is connected and T
2, T
4, T
6, T
8The common port that is connected connects the input of three-phase four-arm inverter circuit respectively, and the input of three-phase four-arm inverter circuit links to each other with photoelectrical coupler 3.Four inductance L
1, L
2, L
3, L
4Input link to each other four inductance L with each bridge output a, b, c, the n of three-phase four-arm inverter circuit respectively
1, L
2, L
3, L
4Output incoming transport electrical network, link to each other with load.Capacitor C 1 is in parallel with each brachium pontis of three-phase four-arm inverter circuit, and links to each other with the input of three-phase four-arm inverter circuit.Preferably, switching tube is the IGBT of band inverse parallel diode.The laod unbalance bucking-out system is after the break-make control of the IGBT of inverter 7 switching tube, what export is voltage, need to become the magnitude of current through behind the inductance, electric power system is compensated, make bus A phase, B phase, C reach neutral line N mutually and go up the current sinusoidal symmetry, reach the purpose of compensation, simultaneously, utilize the energy storage of inductance to be used for keeping the constant of threephase load unbalance compensator dc voltage, to reach the effect of eliminating ripple current.
During work, the laod unbalance bucking-out system is inserted electrical network, current sensor 1 and voltage sensor 2 are gathered current signal and the voltage signal of load circuit respectively, and current signal and the voltage signal gathered are passed to low pass filter 3; The current signal of 3 pairs of receptions of low pass filter and voltage signal carry out filtering to be handled, and current signal and the voltage signal handled through filtering are delivered to first dsp chip 4; Current signal and the voltage signal handled through filtering of 4 pairs of receptions of first dsp chip carry out analytical calculation, needing to obtain the current signal of compensation, and the current signal of needs compensation is sent to fpga chip 6; Fpga chip 6 produces pwm pulse signal according to the current signal of the needs compensation that first dsp chip 4 sends, and pwm pulse signal is flowed to institute's inverter 7; Inverter 7 is according to eight IGBT switch transistor T of pwm pulse signal control
1～T
8Open and turn-off, each electric current that need compensate mutually of output obtains the stable control of three-phase equilibrium fast effect, eliminates the low-voltage distribution system neutral current, effectively improves three-phase load and can not divide equally caused electric energy loss and equipment damage.Touch-screen 8 shows the operation information of first dsp chip 4 in real time; The imbalance compensation system communicates by the computer of communication interface 9 with external equipment such as main website of power office, the laod unbalance bucking-out system information such as service data, analysis result be transferred to the computer of main website of power office by communication interface 9, the computer of main website of power office also can be controlled by the running status of 9 pairs of laod unbalance bucking-out systems of communication interface, second dsp chip 5 passes through the control command that communication interface 9 receives the computer transmission of main websites of power office, control command is classified handle and send to first dsp chip 4; Communication interface 9 both can be used for directly and external equipment carries out communication, also can with carry out wireless telecommunications with external equipment after wireless communication module is connected.
In the present embodiment, the model of low pass filter 3 is YB-D; The model of first dsp chip 4 is the TMS320F2812 of TI company; The model of second dsp chip 5 is the TMS320F6000 of TI company; The model of fpga chip 6 is the EP1C6Q240C8 of the Cyclone series of altera corp, can finish automatically and upper control first dsp chip 4 between high-speed communication, and portion is provided with the data buffer zone of two-way read-write within it, for the distribution of pwm pulse signal is provided convenience.IGBT adopts the soft penetration Simx series of the Semikron 1200V/200A of company series, and this series IGBT has following characteristics: higher switching frequency, but general stable operation helps to improve the dynamic responding speed of whole system at 10kHz; Simple in structure, be convenient to install and close debugging; Switching loss and conduction loss are all less, help to improve the energy conversion efficiency of system; Be suitable for the cheap installation cost that industrial quarters is used.
In sum, it is the three-phase four-wire power supply net of main load that laod unbalance bucking-out system of the present invention is suitable for the single-phase load, three-phase load can be effectively improved and caused electric energy loss and equipment damage can not be divided equally, reaction speed is fast, and the precision height can obtain the stable control of three-phase equilibrium fast effect, eliminate the low-voltage distribution system neutral current, the comprehensive compensation of realization system reactive power and negative sequence component reaches the energy-saving and emission-reduction purpose, effectively energy savings loss.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique, under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (3)
1. laod unbalance bucking-out system, it is characterized in that, described laod unbalance bucking-out system comprises current sensor, voltage sensor, low pass filter, first dsp chip, touch-screen, second dsp chip, fpga chip, communication interface and inverter, described current sensor all links to each other with the input of described low pass filter with voltage sensor, the output of described low pass filter, first dsp chip, fpga chip links to each other successively with inverter, described touch-screen all links to each other with described first dsp chip with second dsp chip, described communication interface links to each other with described second dsp chip, wherein:
Described current sensor and voltage sensor are gathered current signal and the voltage signal of load circuit respectively, and current signal and the voltage signal gathered are passed to described low pass filter;
Described low pass filter carries out the filtering processing to current signal and the voltage signal that receives, and current signal and the voltage signal handled through filtering are delivered to first dsp chip;
Described first dsp chip carries out analytical calculation to current signal and the voltage signal handled through filtering that receives, and needing to obtain the current signal of compensation, and the current signal of needs compensation is sent to described fpga chip;
Described fpga chip produces pwm pulse signal according to the current signal of the needs compensation that first dsp chip sends, and pwm pulse signal is flowed to described inverter;
Described inverter is according to each electric current that need compensate mutually of pwm pulse signal output.
2. a kind of laod unbalance bucking-out system according to claim 1, it is characterized in that, described inverter comprises three-phase four-arm inverter circuit, four inductance and an electric capacity, described three-phase four-arm inverter circuit is made up of four brachium pontis parallel with one another, each brachium pontis is made up of two switching tube series aiding connections, the series connection intermediate connection point is each bridge output, and two ends that join of four brachium pontis parallel connections connect the input of described three-phase four-arm inverter circuit respectively; The input of described four inductance links to each other with each bridge output of described three-phase four-arm inverter circuit respectively, and the output of described four inductance links to each other with load; Described electric capacity is in parallel with each brachium pontis of described three-phase four-arm inverter circuit, and links to each other with the input of three-phase four-arm inverter circuit.
3. a kind of laod unbalance bucking-out system according to claim 2 is characterized in that, described switching tube is the IGBT of band inverse parallel diode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102240325A CN103269071A (en) | 2013-06-06 | 2013-06-06 | Load unbalance compensation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102240325A CN103269071A (en) | 2013-06-06 | 2013-06-06 | Load unbalance compensation system |
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| CN103269071A true CN103269071A (en) | 2013-08-28 |
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| CN2013102240325A Pending CN103269071A (en) | 2013-06-06 | 2013-06-06 | Load unbalance compensation system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065092A (en) * | 2014-06-04 | 2014-09-24 | 毛四新 | Intelligent balance compensation method and apparatus |
| CN105071420A (en) * | 2015-08-28 | 2015-11-18 | 江苏省电力公司扬州供电公司 | Distribution transformer three-phase current dynamic balancing apparatus and work method thereof |
| CN106026143A (en) * | 2016-08-01 | 2016-10-12 | 山东锦华电力设备有限公司 | Three-phase power balance device based on FPGA control and control system |
| CN111474977A (en) * | 2020-04-20 | 2020-07-31 | 全球能源互联网研究院有限公司 | Power self-adaption device and method of high-voltage direct-current breaker energy supply system |
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| JP2004229494A (en) * | 2003-01-27 | 2004-08-12 | Korea Electric Power Corp | Uninterruptive bypass device for high/low voltage phase conversion |
| CN201994670U (en) * | 2010-10-26 | 2011-09-28 | 中国电力科学研究院 | Low-voltage dynamic generalized reactive power compensation device |
| CN202094634U (en) * | 2010-10-26 | 2011-12-28 | 中国电力科学研究院 | Dynamic reactive power compensation device |
| CN203289103U (en) * | 2013-06-06 | 2013-11-13 | 国家电网公司 | Load unbalance compensating system |
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2013
- 2013-06-06 CN CN2013102240325A patent/CN103269071A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004229494A (en) * | 2003-01-27 | 2004-08-12 | Korea Electric Power Corp | Uninterruptive bypass device for high/low voltage phase conversion |
| CN201994670U (en) * | 2010-10-26 | 2011-09-28 | 中国电力科学研究院 | Low-voltage dynamic generalized reactive power compensation device |
| CN202094634U (en) * | 2010-10-26 | 2011-12-28 | 中国电力科学研究院 | Dynamic reactive power compensation device |
| CN203289103U (en) * | 2013-06-06 | 2013-11-13 | 国家电网公司 | Load unbalance compensating system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065092A (en) * | 2014-06-04 | 2014-09-24 | 毛四新 | Intelligent balance compensation method and apparatus |
| CN105071420A (en) * | 2015-08-28 | 2015-11-18 | 江苏省电力公司扬州供电公司 | Distribution transformer three-phase current dynamic balancing apparatus and work method thereof |
| CN105071420B (en) * | 2015-08-28 | 2019-05-24 | 江苏省电力公司扬州供电公司 | A kind of distribution transformer three-phase current dynamic balancer and its working method |
| CN106026143A (en) * | 2016-08-01 | 2016-10-12 | 山东锦华电力设备有限公司 | Three-phase power balance device based on FPGA control and control system |
| CN111474977A (en) * | 2020-04-20 | 2020-07-31 | 全球能源互联网研究院有限公司 | Power self-adaption device and method of high-voltage direct-current breaker energy supply system |
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Application publication date: 20130828 |