CN205407292U - Distributing type energy intelligence access system - Google Patents

Distributing type energy intelligence access system Download PDF

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Publication number
CN205407292U
CN205407292U CN201620190640.8U CN201620190640U CN205407292U CN 205407292 U CN205407292 U CN 205407292U CN 201620190640 U CN201620190640 U CN 201620190640U CN 205407292 U CN205407292 U CN 205407292U
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China
Prior art keywords
bus
switch
phase
distributed energy
transformer
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CN201620190640.8U
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Inventor
刘君
曾华荣
曾鹏
马晓红
陈仕军
文贤馗
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Electric Power Research Institute of Guizhou Power Grid Co Ltd
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Electric Power Research Institute of Guizhou Power Grid Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The utility model discloses a distributing type energy intelligence access system, photovoltaic array pass through the QF1 switch and are connected with a DCDC converter, and a DCDC converter passes through the QF3 switch and is connected with the dc bus, energy storage battery passes through the QF2 switch and is connected with the 2nd DCDC converter, and the 2nd DCDC converter passes through the QF4 switch to be connected with the dc bus, and the dc bus is connected with the two -way dc -to -ac converter of DCAC intelligence, and the two -way dc -to -ac converter of DCAC intelligence passes through the QF9 switch to be connected with ac bus, and ac bus passes through the QF10 switch and is connected with intelligent transformer, and intelligent transformer is connected with public power grid, the problem of the distributed energy insert grid system and have a many places harmonic, voltage fluctuation with flicker etc is solved, bring very big harm for the system, reduced entire system's load power factor, make system's line loss increase, it adopts ac energisation to have the high scheduling problem of the single use cost of power supply to fill electric pile.

Description

A kind of distributed energy intelligent access system
Technical field
This utility model belongs to technical field of new energy utilization, particularly relates to a kind of distributed energy intelligent access system.
Background technology
Along with country is to renewable applicable popularization, distributed energy resource system has been indispensable important supplement in China's energy supply, along with improving constantly of technical merit, the specific investment cost cost of distributed energy resource system constantly reduces, and will become an important development direction in future source of energy field.Domestic distributed energy can play oneself self-sustaining also by unnecessary electricity counter send public electric wire net obtain economic well-being of workers and staff.Along with wideling popularize of New-energy electric vehicle, charging pile domestic trend is inevitable.Well how emphasis and the difficult point of present all trades and professions research distributed energy Appropriate application.
At present, large quantities of distributed energy resource systems access low-voltage distribution system, the construction of low-voltage distribution system construction and photovoltaic generating system is asynchronous, be usually low-voltage distribution system build up operation for many years after, distributed system to access;The difference that low-voltage distribution system and distributed system are built, owing to distributed energy is when accessing voltage distribution system, due to problems such as distributed energy exist many places harmonic wave, voltage fluctuation and flicker, brings very big harm to system safety operation;And reduce the power-factor of load of whole system, make system line loss increase.And charging pile relies primarily on the alternating current of electrical network and is powered in prior art, it is single to there is electric energy supply in this, cannot charge once have a power failure, and is charged there is the problems such as use cost is high in peak times of power consumption with alternating current.
Summary of the invention
The technical problems to be solved in the utility model: a kind of distributed energy intelligent access system is provided, to solve distributed energy access network system in prior art, owing to there is many places harmonic wave, voltage pulsation and the problem such as flash, very big harm is brought to system, reduce the power-factor of load of whole system, make system line loss increase;And the charging pile employing Alternating Current Power Supply of prior art exists electric energy and supplies single, cannot charge once have a power failure, being charged there is the problems such as use cost is high in peak times of power consumption with alternating current.
Technical solutions of the utility model:
A kind of distributed energy intelligent access system, it includes public electric wire net, ac bus and dc bus, and photovoltaic array is connected with a DC/DC transducer by QF1 switch, and a DC/DC transducer is connected with dc bus by QF3 switch;Energy-storage battery is connected with the 2nd DC/DC transducer by QF2 switch, 2nd DC/DC transducer is connected with dc bus by QF4 switch, dc bus is connected with the DC/AC two-way inverter of intelligence, the DC/AC two-way inverter of intelligence is connected with ac bus by QF9 switch, ac bus is connected with intelligent transformer by QF10 switch, and intelligent transformer is connected with public electric wire net.
AC load is connected with ac bus by QF8 switch;Charging pile exchange input port is connected with ac bus by QF52 switch, and dc bus is connected with charging pile direct current input port by QF51 switch.
Wind-driven generator is connected with AC-DC-AC transducer, and AC-DC-AC transducer is connected with ac bus by QF7 switch.
Described intelligent transformer includes low pressure input stage, and low pressure input stage is connected with isolation level, and isolation level is connected with High voltage output level;Described low pressure input stage includes LC wave filter and has the voltage source inverter of phase-shifting carrier wave modulation technique, and LC wave filter is connected with voltage source inverter;Described isolation level includes two-way full-bridge converter and the high-frequency insulation isolating transformer composition of three-phase independence, and two-way full-bridge converter is connected with high-frequency insulation isolating transformer;The phase-shifting carrier wave modulation technique VSC module composition three-phase Y-connection that has that described output stage adopts three-phase separate is connected with public electric wire net.
Described intelligent transformer input stage adopts phase-shifting carrier wave modulation control, and isolation level adopts sky to control than control or open loop PWM, and output stage adopts phase-shifting carrier wave modulation control.
The described DC/AC two-way inverter of intelligence includes rectification adverser, distributed energy is connected with rectification adverser after dc circuit breaker and electric capacity counnter attack diode series circuit, rectification adverser outfan is connected with three-phase isolation transformer input, three-phase isolation transformer outfan is connected with AC circuit breaker, and AC circuit breaker is connected with ac bus.
Described ac bus is parallel with communication lightning-protection device.
The beneficial effects of the utility model:
This utility model is compared with the prior art, it set up ac bus and dc bus, dc bus is connected with ac bus by the DC/AC two-way inverter of intelligence, photovoltaic array component is connected with dc bus by cable and a DC/DC transducer, energy-storage battery is connected with dc bus also by cable and the 2nd DC/DC transducer, and the distributed photovoltaic energy can directly charge to energy-storage battery;Charging pile is connected with dc bus also by cable, can pass through energy-storage battery and distributed photovoltaic cell panel direct DC charging during New-energy electric vehicle charging, and charging rate is fast;Wind-driven generator is connected with AC-DC-AC transducer, and AC-DC-AC transducer is connected with ac bus by QF7 switch, and ac bus is connected with AC load, charging pile is also connected with ac bus, New-energy electric vehicle is also by exchange directly charging, it is possible to directly charged by direct current
This utility model advantage: distributed energy charges to distributed energy storage battery and New-energy electric vehicle with the form of direct current, and charging rate is fast, and sufficiently effective make use of distributed energy;New-energy electric vehicle was charged by AC system in night (electrical network trough) time, reduced use cost;The power quality problems such as the harmonic wave of distributed clean energy resource, voltage fluctuation and flicker can be solved by intelligent transformer, improve system load power factor, reduce line loss, improve the utilization rate of electric power facility;Energy-storage battery, when night or depletion of YANG light, utilizes electrical network trough electricity price cheap, energy storage device is charged by the two-way inverter of DC/AC by electrical network electric energy, plays electrical network peak load shifting effect;The effect of back-to-back voltage source converter can be played, be conducive to the voltages such as solar energy, wind-force and small power station or the bigger distributed power source of frequency fluctuation to access electrical network, improve operation of power networks stability, and improve the quality of power supply;Solve in prior art distributed energy and access network system, owing to there is many places harmonic wave, voltage pulsation and the problem such as flash, brings very big harm to system, reduces the power-factor of load of whole system, make system line loss increase;And the charging pile employing Alternating Current Power Supply of prior art exists electric energy and supplies single, cannot charge once have a power failure, being charged there is the problems such as use cost is high in peak times of power consumption with alternating current.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is this utility model embodiment intelligent transformer principle assumption diagram.
Detailed description of the invention
A kind of distributed energy intelligent access system, it includes public electric wire net 11, ac bus and dc bus, and photovoltaic array 1 is connected with a DC/DC transducer 3 by QF1 switch, and a DC/DC transducer 3 is connected with dc bus by QF3 switch;Energy-storage battery 2 is connected with the 2nd DC/DC transducer 4 by QF2 switch, 2nd DC/DC transducer 4 is connected with dc bus by QF4 switch, dc bus is connected with the DC/AC two-way inverter 9 of intelligence, the two-way inverter 9 of DC/AC intelligence is connected with ac bus by QF9 switch, ac bus is connected with intelligent transformer 10 by QF10 switch, and intelligent transformer 10 is connected with public electric wire net.
AC load 8 is connected with ac bus by QF8 switch;Charging pile 5 is exchanged input port and is connected with ac bus by QF52 switch.
Wind-driven generator 6 is connected with AC-DC-AC transducer 7, and AC-DC-AC transducer 7 is connected with ac bus by QF7 switch.
Dc bus is connected with charging pile 5 direct current input port by QF51 switch.
Charging pile 5 is electric automobile AC/DC integrated charge pile, has two kinds of charge modes, including charge connector, master controller, man-machine interactive system, DC charging power supply, alternating current-direct current circuit units.
Described intelligent transformer includes low pressure input stage, and low pressure input stage is connected with isolation level, and isolation level is connected with High voltage output level;Described low pressure input stage includes LC wave filter and has the voltage source inverter of phase-shifting carrier wave modulation technique, and LC wave filter is connected with voltage source inverter;Described isolation level includes two-way full-bridge converter and the high-frequency insulation isolating transformer composition of three-phase independence, and two-way full-bridge converter is connected with high-frequency insulation isolating transformer;The phase-shifting carrier wave modulation technique VSC module composition three-phase Y-connection that has that described output stage adopts three-phase separate is connected with public electric wire net.
Described intelligent transformer input stage adopts phase-shifting carrier wave modulation control, and isolation level adopts sky to control than control or open loop PWM, and output stage adopts phase-shifting carrier wave modulation control.
The intelligent transformer that this utility model adopts is a kind of based on voltage source converter, there are low pressure input stage, isolation level, High voltage output level, by HVDC Modulation becomes after low pressure input stage is carried out AC/DC conversion high-frequency signal through high-frequency insulation transformer coupled to High voltage output level again, DC/AC conversion is carried out again, thus being connected with public electric wire net by High voltage output level.Low pressure input stage adopts three-phase four-wire system structure, often independent voltage source inverter is set mutually, owing to low-pressure side electric current is relatively larger, often a LC wave filter is set mutually, energy flows into each phase voltage source type inverter through LC wave filter, the number of low pressure input stage every phase power model is determined by three aspects of pressure grade of transmission power, input voltage and power electronic devices (IGBT), and each phase power model of low pressure input stage adopts parallel way cascade.Isolation level is made up of two-way full-bridge converter and the high-frequency insulation isolating transformer of three-phase independence, energy capable of bidirectional flowing, and the low-pressure section of two-way full-bridge converter is connected with low pressure input stage, and the high-pressure section of two-way full-bridge converter is connected with High voltage output level.High voltage output level adopts the single-phase series-parallel cascade system of VSC module and public electric wire net voltage to match, every phase module number is 10kV to be determined divided by the pressure grade of power electronic devices (IGBT), this utility model intelligent transformer utilizes phase-shifting carrier wave modulation technique to improve equivalent switching frequency, can reduce the requirement to boost inductance harmonics restraint, and there is the advantages such as fast response time, Electro Magnetic Compatibility be good.
The described DC/AC two-way inverter of intelligence includes rectification adverser, distributed energy is connected with rectification adverser after dc circuit breaker and electric capacity counnter attack diode series circuit, rectification adverser outfan is connected with three-phase isolation transformer input, three-phase isolation transformer outfan is connected with AC circuit breaker, and AC circuit breaker is connected with ac bus.
Described ac bus is parallel with communication lightning-protection device.
A kind of cut-in method of distributed energy intelligent access system, it includes:
Photovoltaic array, energy-storage battery supply unidirectional current by dc bus to charging pile;
The electric energy of photovoltaic array delivers to dc bus after being converted by DC/DC, delivers to ac bus, again through delivering to public electric wire net after intelligent transformer after being converted to alternating current again through the DC/AC two-way inverter of intelligence;
Daytime, photovoltaic array charged to energy-storage battery, and night, energy-storage battery was charged from public electric wire net power taking by intelligent transformer;
Wind-driven generator is by, after AC-DC-AC transducer, delivering to ac bus by alternating current, then pass through intelligent transformer and deliver to public electric wire net.

Claims (7)

1. a distributed energy intelligent access system, it includes public electric wire net (11), ac bus and dc bus, it is characterized in that: photovoltaic array (1) is connected with a DC/DC transducer (3) by QF1 switch, a DC/DC transducer (3) is connected with dc bus by QF3 switch;Energy-storage battery (2) is connected with the 2nd DC/DC transducer (4) by QF2 switch, 2nd DC/DC transducer (4) is connected with dc bus by QF4 switch, dc bus is connected with the DC/AC two-way inverter of intelligence (9), the DC/AC two-way inverter of intelligence (9) is connected with ac bus by QF9 switch, ac bus is connected with intelligent transformer (10) by QF10 switch, and intelligent transformer (10) is connected with public electric wire net.
2. a kind of distributed energy intelligent access system according to claim 1, it is characterised in that: AC load (8) is connected with ac bus by QF8 switch;Charging pile (5) exchange input port is connected with ac bus by QF52 switch, and dc bus is connected with charging pile (5) direct current input port by QF51 switch.
3. a kind of distributed energy intelligent access system according to claim 1, it is characterised in that: wind-driven generator (6) is connected with AC-DC-AC transducer (7), and AC-DC-AC transducer (7) is connected with ac bus by QF7 switch.
4. a kind of distributed energy intelligent access system according to claim 1, it is characterised in that: described intelligent transformer (10) includes low pressure input stage, and low pressure input stage is connected with isolation level, and isolation level is connected with High voltage output level;Described low pressure input stage includes LC wave filter and has the voltage source inverter of phase-shifting carrier wave modulation technique, and LC wave filter is connected with voltage source inverter;Described isolation level includes two-way full-bridge converter and the high-frequency insulation isolating transformer composition of three-phase independence, and two-way full-bridge converter is connected with high-frequency insulation isolating transformer;The phase-shifting carrier wave modulation technique VSC module composition three-phase Y-connection that has that described output stage adopts three-phase separate is connected with public electric wire net.
5. a kind of distributed energy intelligent access system according to claim 1, it is characterized in that: described intelligent transformer (10) input stage adopts phase-shifting carrier wave modulation control, isolation level adopts sky ratio to control or open loop PWM control, and output stage adopts phase-shifting carrier wave modulation control.
6. a kind of distributed energy intelligent access system according to claim 1, it is characterized in that: the described DC/AC two-way inverter of intelligence (9) includes rectification adverser, distributed energy is connected with rectification adverser after dc circuit breaker and electric capacity counnter attack diode series circuit, rectification adverser outfan is connected with three-phase isolation transformer input, three-phase isolation transformer outfan is connected with AC circuit breaker, and AC circuit breaker is connected with ac bus.
7. a kind of distributed energy intelligent access system according to claim 6, it is characterised in that: described ac bus is parallel with communication lightning-protection device.
CN201620190640.8U 2016-03-14 2016-03-14 Distributing type energy intelligence access system Active CN205407292U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105811453A (en) * 2016-03-14 2016-07-27 贵州电网有限责任公司电力科学研究院 Distributed energy intelligent access system and access method thereof
CN107666146A (en) * 2017-11-20 2018-02-06 珠海格力电器股份有限公司 Residential energy sources integrated system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105811453A (en) * 2016-03-14 2016-07-27 贵州电网有限责任公司电力科学研究院 Distributed energy intelligent access system and access method thereof
CN107666146A (en) * 2017-11-20 2018-02-06 珠海格力电器股份有限公司 Residential energy sources integrated system

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