CN203289103U - Load unbalance compensating system - Google Patents
Load unbalance compensating system Download PDFInfo
- Publication number
- CN203289103U CN203289103U CN2013203280664U CN201320328066U CN203289103U CN 203289103 U CN203289103 U CN 203289103U CN 2013203280664 U CN2013203280664 U CN 2013203280664U CN 201320328066 U CN201320328066 U CN 201320328066U CN 203289103 U CN203289103 U CN 203289103U
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- dsp chip
- phase
- current
- pass filter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The utility model discloses a load unbalance compensating system including a current sensor, a voltage sensor, a low-pass filter, a first DSP chip, a touch screen, a second DSP chip, an FPGA chip, a communication interface and an inverter. The current sensor and the voltage sensor are both connected with an input terminal of the low-pass filter. An output terminal of the low-pass filter, the first DSP chip, the FPGA chip and the inverter are sequentially connected together. The touch screen and the second DSP chip are both connected with the first DSP chip. The communication interface is connected with the second DSP chip. The load unbalance compensating system provided by the utility model is suitable for a supply network employing a three-phase four-wire system and taking a single-phase load as the main load, and is high in response speed and high in precision. By adopting the load unbalance compensating system, a stable and quick three-phase balance control effect can be obtained, neutral current in a low-voltage power distribution system is eliminated and comprehensive compensation of reactive power and negative sequence component of the system can be realized.
Description
Technical field
The utility model relates to a kind of laod unbalance bucking-out system, belongs 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 and forms with single-phase load by three-phase load, 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.Due to the maldistribution of three-phase load in three phase and four wire circuit system, the use of adding load is asynchronous, randomness is large, has caused distribution transformer constantly to be in threephase load unbalanced operation state.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 had a serious impact, simultaneously also can accelerate 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, and 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 the problems such as excessive.
Harm to power consumption equipment: imbalance of three-phase voltage will make contrary moment of torsion in motor increase, thereby cause motor to heat up, decrease in efficiency, the 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, increase cost of equipment maintenance.
The best phase-splitting reactive compensation system of compensation effect compensates load in the market, also the reactive current in 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 likely larger after reactive power compensation, so the electric industry power supply department can only adopt the mode of artificial separated time to carry out load adjustment.
From the above, the three-phase imbalance of using electricity system is very serious on harm and the impact of transformer, electric equipment and using electricity system, especially fully effectively utilizing of electric power energy is formed 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 purpose of this utility model is to overcome the defect of prior art and provides kind an a kind of laod unbalance bucking-out system, be suitable for take the three-phase four-wire power supply net of single-phase load as 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, precision is high, can obtain stable three-phase equilibrium fast and control effect, eliminate the low-voltage distribution system neutral current, realize the comprehensive compensation of System Reactive Power 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, the second dsp chip, FPGA(Field Programmable Gate Array, field programmable gate array) chip, communication interface and inverter, described current sensor all is connected with the input of described low pass filter with voltage sensor, the output of described low pass filter, the first dsp chip, fpga chip is connected successively with inverter, described touch-screen all is connected with described the first dsp chip with the second dsp chip, described communication interface is connected with described the second dsp chip, wherein:
Described current sensor and voltage sensor gather respectively current signal and the voltage signal of load circuit, and the current signal and the voltage signal that gather 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 processed through filtering are delivered to the first dsp chip;
Described the first dsp chip carries out analytical calculation to current signal and the voltage signal processed 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 the 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 comprised of four brachium pontis parallel with one another, each brachium pontis is comprised 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 respectively the input of described three-phase four-arm inverter circuit; The input of described four inductance is connected with each bridge output of described three-phase four-arm inverter circuit respectively, and the output of described four inductance is connected with load; Described electric capacity is in parallel with each brachium pontis of described three-phase four-arm inverter circuit, and with the input of three-phase four-arm inverter circuit, is connected.
In above-mentioned a kind of laod unbalance bucking-out system, described switching tube is the IGBT with anti-paralleled diode.
The beneficial effects of the utility model are: be suitable for take the three-phase four-wire power supply net of single-phase load as 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, precision is high, can obtain stable three-phase equilibrium fast and control effect, eliminate the low-voltage distribution system neutral current, realize the comprehensive compensation of System Reactive Power 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 utility model;
Fig. 2 is partial electrical schematic diagram of the present utility model.
Embodiment
, in order to make those skilled in the art can understand better the technical solution of the utility model, below in conjunction with accompanying drawing, its embodiment is described in detail:
See also Fig. 1, laod unbalance bucking-out system of the present utility model comprises current sensor 1, voltage sensor 2, low pass filter 3, the first dsp chip 4, touch-screen 8, the second dsp chip 5, fpga chip 6, communication interface 9 and inverter 7, current sensor 1 all is connected with the input of low pass filter 3 with voltage sensor 2, the output of low pass filter 3, the first dsp chip 4, fpga chip 6 are connected successively with inverter 7, touch-screen 8 all is connected with the first dsp chip 4 with the second dsp chip 5, and communication interface 9 is connected with the second dsp chip 5.
See also Fig. 2, inverter 7 comprises three-phase four-arm inverter circuit, inductance L again
1, inductance L
2, inductance L
3, inductance L
4With a capacitor C 1, the three-phase four-arm inverter circuit is comprised of four brachium pontis parallel with one another, comprises altogether eight switch transistor T
1～T
8, each brachium pontis is comprised 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 respectively the input of three-phase four-arm inverter circuit, and the input of three-phase four-arm inverter circuit is connected with photoelectrical coupler 3.Four inductance L
1, L
2, L
3, L
4Input be connected with each bridge output a, b, c, the n of three-phase four-arm inverter circuit respectively, four inductance L
1, L
2, L
3, L
4Output incoming transport electrical network, be connected with load.Capacitor C 1 is in parallel with each brachium pontis of three-phase four-arm inverter circuit, and with the input of three-phase four-arm inverter circuit, is connected.Preferably, switching tube is the IGBT with anti-paralleled diode.The laod unbalance bucking-out system is after the break-make of the IGBT of inverter 7 switching tube is controlled, what export is voltage, need to become the magnitude of current after inductance, electric power system is compensated, make bus A phase, B phase, C reach mutually the upper current sinusoidal of neutral line N symmetrical, 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, with laod unbalance bucking-out system access electrical network, current sensor 1 and voltage sensor 2 gather respectively current signal and the voltage signal of load circuit, and the current signal and the voltage signal that gather 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 processed, and current signal and the voltage signal processed through filtering are delivered to the first dsp chip 4; Current signal and the voltage signal processed through filtering of 4 pairs of receptions of the 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 the first dsp chip 4 sends, and pwm pulse signal is flowed to institute's inverter 7; Inverter 7 is controlled eight IGBT switch transistor T according to pwm pulse signal
1～T
8Open and turn-off, each electric current that need compensate mutually of output, obtain stable three-phase equilibrium fast and control 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 the first dsp chip 4 in real time; The imbalance compensation system communicates by communication interface 9 and the computer of external equipment such as main website of power office, the laod unbalance bucking-out system the information exchange such as service data, analysis result cross communication interface 9 and be transferred to the computer of main website of power office, 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, the second dsp chip 5 receives the control command of the computer transmission of main website of power office by communication interface 9, control command is classified and processed and send to the 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 the first dsp chip 4 is the TMS320F2812 of TI company; The model of the 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 automatically complete and upper control the first dsp chip 4 between high-speed communication, and section 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 1200V/200A of Semikron 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 device 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; The cheap installation cost that is suitable for the industrial quarters application.
In sum, laod unbalance bucking-out system of the present utility model is suitable for take the three-phase four-wire power supply net of single-phase load as 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, and precision is high, can obtain stable three-phase equilibrium fast and control effect, eliminate the low-voltage distribution system neutral current, realize the comprehensive compensation of System Reactive Power power and negative sequence component, reach the energy-saving and emission-reduction purpose, effectively energy savings loss.
Above embodiment is only for illustration of the utility model, but not to restriction of the present utility model, person skilled in the relevant technique, in the situation that do not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, 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, the first dsp chip, touch-screen, the second dsp chip, fpga chip, communication interface and inverter, described current sensor all is connected with the input of described low pass filter with voltage sensor, the output of described low pass filter, the first dsp chip, fpga chip is connected successively with inverter, described touch-screen all is connected with described the first dsp chip with the second dsp chip, described communication interface is connected with described the second dsp chip, wherein:
Described current sensor and voltage sensor gather respectively current signal and the voltage signal of load circuit, and the current signal and the voltage signal that gather 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 processed through filtering are delivered to the first dsp chip;
Described the first dsp chip carries out analytical calculation to current signal and the voltage signal processed 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 the 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 comprised of four brachium pontis parallel with one another, each brachium pontis is comprised 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 respectively the input of described three-phase four-arm inverter circuit; The input of described four inductance is connected with each bridge output of described three-phase four-arm inverter circuit respectively, and the output of described four inductance is connected with load; Described electric capacity is in parallel with each brachium pontis of described three-phase four-arm inverter circuit, and with the input of three-phase four-arm inverter circuit, is connected.
3. a kind of laod unbalance bucking-out system according to claim 2, is characterized in that, described switching tube is the IGBT with anti-paralleled diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203280664U CN203289103U (en) | 2013-06-06 | 2013-06-06 | Load unbalance compensating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203280664U CN203289103U (en) | 2013-06-06 | 2013-06-06 | Load unbalance compensating system |
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| Publication Number | Publication Date |
|---|---|
| CN203289103U true CN203289103U (en) | 2013-11-13 |
Family
ID=49545447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203280664U Expired - Lifetime CN203289103U (en) | 2013-06-06 | 2013-06-06 | Load unbalance compensating system |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269071A (en) * | 2013-06-06 | 2013-08-28 | 国家电网公司 | Load unbalance compensation system |
| CN109638680A (en) * | 2019-01-23 | 2019-04-16 | 深圳供电局有限公司 | Distributed board outdoor |
| CN110198080A (en) * | 2019-07-01 | 2019-09-03 | 国网山东省电力公司临朐县供电公司 | A kind of power system reactive power compensation device remote monitoring system |
| US10840825B2 (en) | 2017-10-26 | 2020-11-17 | Industrial Technology Research Institute | Voltage balance control method and device for three-phase DC-AC inverter |
-
2013
- 2013-06-06 CN CN2013203280664U patent/CN203289103U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269071A (en) * | 2013-06-06 | 2013-08-28 | 国家电网公司 | Load unbalance compensation system |
| US10840825B2 (en) | 2017-10-26 | 2020-11-17 | Industrial Technology Research Institute | Voltage balance control method and device for three-phase DC-AC inverter |
| CN109638680A (en) * | 2019-01-23 | 2019-04-16 | 深圳供电局有限公司 | Distributed board outdoor |
| CN110198080A (en) * | 2019-07-01 | 2019-09-03 | 国网山东省电力公司临朐县供电公司 | A kind of power system reactive power compensation device remote monitoring system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |
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| CX01 | Expiry of patent term |