CN203014390U - Energy storage power adjusting device - Google Patents

Energy storage power adjusting device Download PDF

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Publication number
CN203014390U
CN203014390U CN2012207052198U CN201220705219U CN203014390U CN 203014390 U CN203014390 U CN 203014390U CN 2012207052198 U CN2012207052198 U CN 2012207052198U CN 201220705219 U CN201220705219 U CN 201220705219U CN 203014390 U CN203014390 U CN 203014390U
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China
Prior art keywords
unit
phase bridge
regulon
digital processing
processing control
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Expired - Fee Related
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CN2012207052198U
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Chinese (zh)
Inventor
丁明
陈自年
罗亚桥
郑国强
陈中
陈忠
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ANHUI ACADEMY OF ELECTRIC POWER SCIENCES
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
Hefei University of Technology
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ANHUI ACADEMY OF ELECTRIC POWER SCIENCES
Hefei University of Technology
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Priority to CN2012207052198U priority Critical patent/CN203014390U/en
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Publication of CN203014390U publication Critical patent/CN203014390U/en
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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
    • Y02E40/40—Arrangements for reducing harmonics
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Abstract

The utility model provides an energy storage power adjusting device. The device consists of a circuit parameter monitoring unit, a digital processing control unit, a driving unit, a man-machine conversation unit and a three-phase bridge type adjusting unit; wherein the circuit parameter monitoring unit, the digital processing control unit, the driving unit and the three-phase bridge type adjusting unit are connected in sequence through electric wires, and the digital processing control unit and the man-machine conversation unit are connected. The energy storage power adjusting device has the advantages that power fluctuations of renewable energy sources in an energy storage power station are smoothed; the surplus capacity of the energy storage power adjusting device is used to realize a filtering function of harmonic pollution of a power grid; cost performance of the energy storage power station can be effectively improved, and investment cost is saved, facilitating large-scale commercialized application of energy storage technology in the fields of new energy power generation and intelligent power grid construction.

Description

A kind of energy storage Power Conditioning Unit
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to a kind of energy storage Power Conditioning Unit in generation of electricity by new energy.
Background technology
Along with day by day highlighting of energy crisis and environmental issue, greatly develop the development trend that has become the current power system based on renewable energy power generation technology such as wind-force, photovoltaics.Yet; the power output such as the regenerative resource such as wind-force, photovoltaic exists random fluctuation and characteristics at intermittence; especially extensive centralized along with the regenerative resource such as wind-force, photovoltaic power station or scale is distributed is incorporated into the power networks, the stochastic volatility problem of its power output has been brought serious challenge to power system stability operation and the quality of power supply.For the problems referred to above, one of existing solution is to utilize the level and smooth regenerative resource output-power fluctuation of energy storage technology, but the wide-scale adoption energy storage technology also exists energy-storage system cost costliness and the low problem of utilance.The energy-accumulating power station power capacity is configured by the fluctuation of regenerative resource Maximum Power Output, but the polytropy due to weather, the actual power fluctuation of regenerative resource power station is usually less than the maximum power undulating value, therefore the energy-storage system that participates in level and smooth regenerative resource power fluctuation often has higher residual capacity, causes utilization rate of equipment and installations low; In addition, along with generation of electricity by new energy device, nonlinear-load and electronic power convertor drop into operation of power networks, brought serious harmonic pollution to electrical network; Although adopt effectively harmonic carcellation electric current pollution of Active Power Filter-APF, compensating power improves the quality of power supply, its input cost is high, becomes to cause this technology to be difficult to one of key factor of large-scale promotion application.
The utility model content
Deficiency on existing energy storage technology the utility model proposes a kind of energy storage Power Conditioning Unit with level and smooth regenerative resource output-power fluctuation and filtering harmonic pollution in electric power net function.This device makes energy-accumulating power station in level and smooth regenerative resource output-power fluctuation, utilize in the residual capacity compensation network of energy storage Power Conditioning Unit harmonic wave and idle component to improve the quality of power supply, realize " a tractor serves several purposes " function, improved the energy-storage system utilance.Concrete structure of the present utility model is: a kind of energy storage Power Conditioning Unit is comprised of circuit parameter monitoring means 1, digital processing control unit 2, driver element 3, human-computer dialogue unit 4 and three-phase bridge regulon 5; Wherein, the output of circuit parameter monitoring means 1 is connected with the input of digital processing control unit 2, the output of digital processing control unit 2 is connected with the input of driver element 3 communication interface with human-computer dialogue unit 4 respectively, and the output of driver element 3 is connected with the input of three-phase bridge regulon 5;
The real-time running state signal that described circuit parameter monitoring means 1 is responsible on real-time detection of grid, and operating state signal is delivered to digital processing control unit 2;
Described digital processing control unit 2 is according to transmitting from circuit parameter monitoring means 1 current-order that the signal deciding of coming realizes the smoothing and filtration function of unity;
Described driver element 3 drives three-phase bridge regulon 5, simultaneously three-phase bridge regulon 5 is carried out over-voltage over-current protection;
Described human-computer dialogue unit 4 is connected with digital processing control unit 2, and the information such as electric current and voltage, meritorious idle, error protection are shown in real time;
Described three-phase bridge regulon 5 topologys are voltage-type three-phase PWM circuit; Three-phase bridge regulon 5 is controlled energy-storage system and is absorbed or discharge activereactive energy, realizes realizing bidirectional electric energy flow, reaches the effect of level and smooth output-power fluctuation and filtering network load harmonic wave;
During use, with circuit parameter monitoring means 1 respectively with electrical network 6, load 7, renewable energy power generation factory 8 and three-phase bridge regulon 5 near circuit be connected, by the voltage and current parameter at the circuit parameter monitoring means 1 described circuit of Real-Time Monitoring place; Three-phase bridge regulon 5 and electrical network 6 and the node of loading between 7 are connected.
The utility model advantage is: this Realization of Product level and smooth to the regenerative resource power fluctuation of energy-accumulating power station; Utilize simultaneously the residual capacity of energy storage Power Conditioning Unit to realize filtration to harmonic pollution in electric power net; This product can effectively improve the cost performance of energy-accumulating power station, saves cost of investment, is conducive to promote energy storage technology in generation of electricity by new energy and the application of intelligent grid construction field large-scale commercial applications.
Description of drawings
Fig. 1 is the schematic diagram of structure of the present utility model and installation site.
Fig. 2 is voltage sampling circuit figure.
Fig. 3 is current sampling circuit figure.
Fig. 4 is regenerative resource station output curve chart.
Fig. 5 is the load current oscillogram.
Fig. 6 is public during without energy storage and power network current is injected in the site i aOscillogram.
Fig. 7 is public when energy storage is arranged and power network current is injected in the site i aOscillogram.
Fig. 8 is that energy storage coordinates the regenerative resource power station smoothly to inject the grid power curve chart.
Sequence number in figure is: circuit parameter monitoring means 1, digital processing control unit 2, driver element 3, human-computer dialogue unit 4, three-phase bridge regulon 5, electrical network 6, load 7, renewable energy power generation factory 8.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and simulation example.
Referring to a kind of energy storage Power Conditioning Unit of Fig. 1, formed by circuit parameter monitoring means 1, digital processing control unit 2, driver element 3, human-computer dialogue unit 4 and three-phase bridge regulon 5; Wherein, the output of circuit parameter monitoring means 1 is connected with the input of digital processing control unit 2, the output of digital processing control unit 2 is connected with the input of driver element 3 communication interface with human-computer dialogue unit 4 respectively, and the output of driver element 3 is connected with the input of three-phase bridge regulon 5; During use, with circuit parameter monitoring means 1 respectively with electrical network 6, load 7, renewable energy power generation factory 8 and three-phase bridge regulon 5 near circuit be connected, by the voltage and current parameter at the circuit parameter monitoring means 1 described circuit of Real-Time Monitoring place; Three-phase bridge regulon 5 and electrical network 6 and the node of loading between 7 are connected.
The real-time running state signal that described circuit parameter monitoring means 1 is responsible on real-time detection of grid, and operating state signal is delivered to digital processing control unit 2.The parameter that circuit parameter monitoring means 1 detects in real time has: the grid side three-phase voltage current e abcWith i abc, regenerative resource power station output current i Rabc, energy storage Power Conditioning Unit output current i Babc, input direct-current side cell voltage u dc, the switch tube voltage electric current u swWith i swWith load input current value i LabcWherein e abcBe namely the common point voltage that is incorporated into the power networks, abc represents a, b, the abbreviation of c three-phase.
Described digital processing control unit 2 is according to transmitting from circuit parameter monitoring means 1 current-order that the signal deciding of coming realizes the smoothing and filtration function of unity;
Described driver element 3 drives three-phase bridge regulon 5, simultaneously three-phase bridge regulon 5 is carried out over-voltage over-current protection; Described human-computer dialogue unit 4 is connected with digital processing control unit 2, and the information such as electric current and voltage, meritorious idle, error protection are shown in real time;
Described three-phase bridge regulon 5 topologys are voltage-type three-phase PWM circuit, the DC side parallel electrochemical capacitor absorbs the DC bus-bar voltage ripple, AC is connected to the grid by filter inductance and Industrial Frequency Transformer, filter inductance is in order to eliminate the high order harmonic component of energy storage Power Conditioning Unit output current, and Industrial Frequency Transformer boosts in order to the electrical isolation and the output that realize the energy storage Power Conditioning Unit.Three-phase bridge regulon 5 is controlled energy-storage system and is absorbed or discharge activereactive energy, realizes realizing bidirectional electric energy flow, thus effectively level and smooth regenerative resource station output fluctuation and filtering network load harmonic wave.
Described digital processing control unit 2 comprises flat volatility control module, harmonic current detection module, instruction current synthesis module and over-voltage over-current protection module.Wherein, flat volatility control module basis e abcWith i RabcCan calculate regenerative resource station output P R, and by P RDegree of fluctuation determine the active current instruction that the level and smooth power fluctuation of energy-storage system need provide i’ BabcHarmonic current detection module basis e abcWith load current i Labc, in order to harmonic wave and the referenced reactive current that determines the required compensation of energy-storage system i LabchThe active current instruction that the flat volatility control module need provide the level and smooth power fluctuation of energy-storage system i’ BabcDeliver to the current-order synthesis module, the harmonic current detecting unit is with harmonic wave and the referenced reactive current of the required compensation of energy-storage system simultaneously i LabchDeliver to the current-order synthesis module, the current-order synthesis module is realized the current-order of smoothing and filtration function of unity with the current-order stack of smoothing and filtration function in order to determine energy-storage system i * BabcCurrent-order synthesis module basis i’ BabcDetermine the residual capacity Δ of energy-storage system iIf, the harmonic current instruction i LabchThe residual capacity Δ that has surpassed energy-storage system i, right i LabchCarry out amplitude limiting processing, the protection energy-storage system is operated in the rated power scope.
Described digital processing control unit 2 is based on the new digital treatment circuit of DSP28335, processes by the electric current and voltage information that ADC interface receiving circuit parameter monitoring unit provides in real time.
Adopt 485 communications protocol between digital processing control unit 2 and human-computer dialogue unit 4; Wherein the LCDs of human-computer dialogue unit 4 is the embedded integrated touch-screen based on the MCGS configuration software, adopts ADM2587E as the RS485 communication chip.The RS485 transceiver of magnetic isolation that ADM2587E has been integrated, communication speed is 500Kbps, adopts inner 3.3V Power supply, can realize 485 communications by Simple fast.
Fig. 2 is the voltage sampling circuit figure based on amplifier LM353, and Fig. 3 is based on amplifier LM353 current sampling circuit.Fig. 4 is regenerative resource station output curve chart, and wherein, peak power output is 240KW approximately, and minimum output power is 90KW approximately, and fluctuation ratio is 167%; The load current waveform contains harmonic component as shown in Figure 5.Fig. 6 to Fig. 8 is simulation result.
When energy-storage system was not worked, power network current was injected in public and site i aWaveform as shown in Figure 6, the fluctuation of regenerative resource power output makes i aThe amplitude big ups and downs, maximum is about 400A, and minimum value is about 180A, and fluctuation ratio reaches 122%; The nonlinear-load electric current makes it have a large amount of harmonic componentss and distorts, i aAberration rate is about 15%.
When energy-storage system provided the smoothing and filtration function simultaneously, power network current was injected in public and site i aWaveform as shown in Figure 7, because the smoothing function of energy-storage system makes i aThe amplitude substantially constant, maximum is about 255A, and minimum value is about 230A, and fluctuation ratio is only 10%; Because the filter function of energy-storage system makes it be approximately sinusoidal waveform, almost all offset the load current harmonic component, i aAberration rate is less than 1%, the aberration rate much smaller than without energy storage filtering the time; Near 0.5s, inject power network current and will distort slightly, because the residual capacity of energy-storage system is not enough to the full remuneration harmonic current at this moment, instruction current synthesis unit clamper amplitude limit harmonic current instruction this moment, the protection energy-storage system is operated in safe range.
Figure 8 shows that under the energy storage smoothing function, the grid power curve is smoothly injected in the regenerative resource power station, and peak power output is 155KW approximately, and minimum output power is 145KW approximately, and fluctuation ratio is 7%, the regenerative resource station output fluctuation that represents in Fig. 4.
By simulation example as seen, the energy storage Power Conditioning Unit that the utility model proposes can realize the unified control of flat volatility and active power filtering, utilize a cover energy storage device effectively smoothly regenerative resource power fluctuation and improvement harmonic pollution in electric power net, thereby effectively improved the cost performance of energy-storage system, saved cost of investment.

Claims (1)

1. an energy storage Power Conditioning Unit, is characterized in that, is comprised of circuit parameter monitoring means (1), digital processing control unit (2), driver element (3), human-computer dialogue unit (4) and three-phase bridge regulon (5); Wherein, the output of circuit parameter monitoring means (1) is connected with the input of digital processing control unit (2), the output of digital processing control unit (2) is connected with the input of driver element (3) and the communication interface of human-computer dialogue unit (4) respectively, and the output of driver element (3) is connected with the input of three-phase bridge regulon (5);
Described circuit parameter monitoring means (1) is responsible for the real-time running state signal on real-time detection of grid, and operating state signal is delivered to digital processing control unit (2);
Described digital processing control unit (2) is realized the current-order i of smoothing and filtration function of unity according to the signal deciding of coming from circuit parameter monitoring means (1) transmission * BabcThis current-order i * BabcThe determine switch pwm signal;
Described driver element (3) drives three-phase bridge regulon (5), simultaneously three-phase bridge regulon (5) is carried out over-voltage over-current protection;
Described human-computer dialogue unit (4) is connected with digital processing control unit (2), and electric current and voltage, meritorious information idle, error protection are shown in real time;
Described three-phase bridge regulon (5) topology is voltage-type three-phase PWM circuit; Three-phase bridge regulon (5) is controlled energy-storage system and is absorbed or discharge activereactive energy, realizes realizing bidirectional electric energy flow, reaches the effect of level and smooth output-power fluctuation and filtering network load harmonic wave;
During use, with circuit parameter monitoring means (1) respectively with electrical network (6), load (7), renewable energy power generation factory (8) and three-phase bridge regulon (5) near circuit be connected, by the voltage and current parameter at the described circuit of circuit parameter monitoring means (1) Real-Time Monitoring place; Node between three-phase bridge regulon (5) and electrical network (6) and load (7) is connected.
CN2012207052198U 2012-12-19 2012-12-19 Energy storage power adjusting device Expired - Fee Related CN203014390U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017121365A1 (en) * 2016-01-13 2017-07-20 北京兆阳能源技术有限公司 Electric energy control device, method and system for source end and load end

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017121365A1 (en) * 2016-01-13 2017-07-20 北京兆阳能源技术有限公司 Electric energy control device, method and system for source end and load end
CN106972515A (en) * 2016-01-13 2017-07-21 北京兆阳能源技术有限公司 Source, the electric energy control device at lotus end, method and system

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C14 Grant of patent or utility model
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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130619

Termination date: 20151219

EXPY Termination of patent right or utility model