CN203368044U - Bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system - Google Patents

Bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system Download PDF

Info

Publication number
CN203368044U
CN203368044U CN 201320076468 CN201320076468U CN203368044U CN 203368044 U CN203368044 U CN 203368044U CN 201320076468 CN201320076468 CN 201320076468 CN 201320076468 U CN201320076468 U CN 201320076468U CN 203368044 U CN203368044 U CN 203368044U
Authority
CN
China
Prior art keywords
grid
circuit
power
load
bidirectional
Prior art date
Application number
CN 201320076468
Other languages
Chinese (zh)
Inventor
刘世阳
赵向阳
Original Assignee
佛山市顺德区北航先进技术产业基地有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 佛山市顺德区北航先进技术产业基地有限公司 filed Critical 佛山市顺德区北航先进技术产业基地有限公司
Priority to CN 201320076468 priority Critical patent/CN203368044U/en
Application granted granted Critical
Publication of CN203368044U publication Critical patent/CN203368044U/en

Links

Classifications

    • Y02E10/563
    • Y02E10/763

Abstract

The utility model relates to a bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system which can realize both grid-connected and off-network work, includes safe isolation, and can supply power for ac and dc loads. A new-energy power generation source, a dc load, an ac load, a storage battery, a power distribution network, a bidirectional grid-connection or off-network inversion circuit, a power-frequency isolation transformer, a bidirectional dc high-frequency isolation circuit and a storage battery charging and discharging controller are combined and connected to form a power generation and utilization system structure. The micro electrical network system includes a grid-connected circuit structure which can supply power for the ad and dc loads and includes a dc safe isolation circuit and an ac safe isolation circuit. The power generation source includes generation via new energy as photovoltaic power generation or wind power generation. When faults occur in the power distribution network, the system can maintain reliable work of the ac and dc loads for a certain time; and when the photovoltaic power generation source or the storage battery has faults or has no power, the distribution network reliably supplies power to the ac and dc loads.

Description

Two-way alternating current-direct current multi-source, multi-load is isolated safely micro-grid system

Technical field

The utility model belongs to the generation of electricity by new energy field, be a kind of that connect generation of electricity by new energy source, AC network, DC load, AC load and energy-storage units and have the micro-grid system structure of safety isolation, can be DC load and AC load reliable power supply simultaneously.

Background technology

At present, the main grid-connected system of known grid-connected power generation system, from the net electricity generation system, its load is mainly AC load.When grid-connected system breaks down at electrical network, no matter whether the new energy resources system energy source has enough energy, all will stop powering to the load until power system restoration is normal.And in the new energy grid-connected power system, majority lacks the safe isolation design of reliable DC side.Stand alone generating system is operated in from net state, and energy source mostly is the solar power generation with fluctuation, wind power generation etc., and when break down in the generation of electricity by new energy source, even near electrical network is normal, electrical network also can't be given and power supply, until the generation of electricity by new energy source recovers normal.

Summary of the invention

Low in order to overcome in existing grid-connected power generation system power supply reliability, improve Electrical Safety rate, generation of electricity by new energy service efficiency and increase with electrical interface (exchanging interface and DC interface), the utility model provides a kind of two-way alternating current-direct current multi-source, multi-load to isolate safely micro-grid system, this system can continue to AC load and DC load power supply when break down in power distribution network or generation of electricity by new energy source, and this system has also increased the safe isolation design of alternating current-direct current.

The utility model solves the technical scheme that its technical problem adopts: a kind of two-way alternating current-direct current multi-source, multi-load is isolated safely micro-grid system, generation of electricity by new energy source wherein, DC voltage booster circuit, AC load, DC load, storage battery, power distribution network, two-way grid-connected/from the net inverter circuit, the power frequency isolating transformer, bidirectional, dc high-frequency isolation circuit, the accumulator cell charging and discharging controller is connected, form generating using electricity system structure, wherein the generation of electricity by new energy source output terminal is connected to the DC voltage booster circuit input, the DC voltage booster circuit output is connected to accumulator cell charging and discharging controller and bidirectional, dc high-frequency isolation circuit input end, bidirectional, dc high-frequency isolation circuit output end be connected to DC load and two-way grid-connected/from net inverter circuit input, two-way grid-connected/be connected to power frequency isolating transformer input from net inverter circuit output, power frequency isolating transformer output connects AC load and grid-connected switch, grid-connected switch is controlled this system and is connected with power distribution network and disconnects, the accumulator cell charging and discharging controller output end connects storage battery.The micro-grid system circuit structure is grid connected structure, and this circuit structure can be AC load and DC load is powered, and has the safe buffer circuit of direct current and exchange safe buffer circuit, and DC voltage booster circuit adopts triple boost parallel circuitss.Native system is divided into 5 major parts: DC voltage booster circuit, the bidirectional, dc high-frequency isolation, direct-flow storage battery discharges and recharges, two-way grid-connected/from the net inverter circuit, the power frequency isolating transformer.DC voltage booster circuit is boosted the low-voltage DC of generation of electricity by new energy source output.After boosting, a part realizes discharging and recharging of storage battery through the direct-flow storage battery charge-discharge circuit; Another part realizes boosting through two-way high-frequency isolation transforming circuit and direct current is isolated safely.Two-way high-frequency isolation transformer forward can be realized the safe isolation of boosting, and oppositely can realize step-down and safety isolation.A two-way high-frequency isolation circuit high-pressure side part is used as DC power supply, to DC load, powered, another part flow to two-way grid-connected/from the net inverter circuit.Two-way grid-connected/from the net inverter circuit, direct current is converted to industrial-frequency alternating current, a part is for AC load power supply, a part is carried out grid-connected through the power frequency isolating transformer.Two-way grid-connected/realize the parallel network reverse function from net inverter circuit forward, oppositely can realize controlled rectification.

The beneficial effects of the utility model are, no matter, whether electrical network breaks down, the generation of electricity by new energy source all can provide the safe and reliable energy for power consumption equipment, and when breaking down or energy source while there is no electric energy in the generation of electricity by new energy source, power consumption equipment still can reliably working, has increased the safe quarantine measures of reliable alternating current-direct current simultaneously.When taking full advantage of this clean energy resource of generation of electricity by new energy, this programme guarantees power consumption equipment electricity consumption reliability, fail safe.

The accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Fig. 1 is electrical block diagram of the present utility model.

Fig. 2 is circuit structure schematic diagram of the present utility model.

Fig. 3 is bidirectional, dc high-frequency isolation circuit structure in the utility model

Fig. 4 be in the utility model two-way grid-connected/from net inverter circuit structure

1. bidirectional, dc high-frequency isolation circuit in figure, 2. two-way grid-connected/from the net inverter circuit.

Embodiment

In this micro-grid system two-way grid-connected/adopt eight power device unit from the net inverter circuit, power device is formula circuit structure back-to-back in twos, forward forms controlled inverter circuit structure, oppositely forms the controlled rectification circuit structure.Bidirectional, dc high-frequency isolation circuit adopts the bidirectional bridge type circuit to add the design of high frequency isolating transformer.The accumulator cell charging and discharging controller is placed on the DC voltage booster circuit output, bidirectional, dc high-frequency isolation circuit input end; AC load should be placed power frequency isolating transformer grid side, and grid-connected switch is from net one side, and DC load is placed bidirectional, dc high-frequency isolation circuit output end, two-way grid-connected/from net inverter circuit input.What the accumulator cell charging and discharging controller adopted is the design of Bidirectional up-down volt circuit, forward is to charge in batteries, boost and adopt single-phase booster circuit, the accumulator charging/discharging circuit output is connected with micro-grid system booster circuit output, as one of power supply of micro-grid system.

Reference is at Fig. 1, and the generation of electricity by new energy source comprises solar power generation source and wind power generation source etc.When energy source only is solar power generation, when generation of electricity by new energy source and the equal fault-free of electrical network and new forms of energy normal power generation, generation of electricity by new energy source output low pressure 20-40V direct current, partly boosted and power control through DC boosting, boosts to 100V.Node 1 is divided into two parts by direct current, and a part is connected with the battery charging and discharging controller and realizes the discharging and recharging of storage battery, and another part is realized by bidirectional, dc high-frequency isolation circuit that the circuit isolation reaches and boosted to again 200V.Node 2 is the DC load power supply, when generation of electricity by new energy is greater than the DC load electricity consumption, dump energy through two-way grid-connected/from the net inverter circuit, to AC portion, power, node 3 is by power frequency isolating transformer and node 4 isolation, node 4 is the AC load power supply, when the AC load power consumption still is less than its amount of power supply, node 4 flows to electrical network by dump energy.When electrical network breaks down, system disconnects grid-connected switch, and all loads are by generation of electricity by new energy source and storage battery joint supply.When electrical network normal, generation of electricity by new energy source and storage battery break down or while not having electric energy or electric energy to be less than the required electricity consumption of load, provide the electric energy compensation by electrical network, now electrical network is to handing over load to be powered, realize that through the power frequency isolating transformer safety isolation arrives node 4 simultaneously, and by two-way grid-connected/carry out rectification from the net inverter circuit control to arrive node 2,2 pairs of DC load of node are powered, advanced bidirectional, dc high-frequency isolation circuit simultaneously and arrive node 1,1 pair of node carries out charging energy-storing by the battery charging and discharging controller to storage battery.

Claims (5)

1. a two-way alternating current-direct current multi-source, multi-load is isolated safely micro-grid system, it is characterized in that: the generation of electricity by new energy source, DC voltage booster circuit, AC load, DC load, storage battery, power distribution network, two-way grid-connected/from the net inverter circuit, the power frequency isolating transformer, bidirectional, dc high-frequency isolation circuit, the accumulator cell charging and discharging controller is connected, form generating using electricity system structure, wherein the generation of electricity by new energy source output terminal is connected to the DC voltage booster circuit input, the DC voltage booster circuit output is connected to accumulator cell charging and discharging controller and bidirectional, dc high-frequency isolation circuit input end, bidirectional, dc high-frequency isolation circuit output end be connected to DC load and two-way grid-connected/from net inverter circuit input, two-way grid-connected/be connected to power frequency isolating transformer input from net inverter circuit output, power frequency isolating transformer output connects AC load and grid-connected switch, grid-connected switch is controlled being connected and disconnection of this system and power distribution network, the accumulator cell charging and discharging controller output end connects storage battery, the micro-grid system circuit structure is grid connected structure, and this circuit structure can be AC load and DC load is powered, and has the safe buffer circuit of direct current and exchange safe buffer circuit, and DC voltage booster circuit adopts triple boost parallel circuitss.
2. micro-grid system according to claim 1, it is characterized in that: two-way grid-connected/adopt eight power device unit from the net inverter circuit, power device is formula circuit structure back-to-back in twos, and forward forms controlled inverter circuit structure, oppositely forms the controlled rectification circuit structure.
3. micro-grid system according to claim 1 is characterized in that: bidirectional, dc high-frequency isolation circuit adopts the bidirectional bridge type circuit to add the design of high frequency isolating transformer.
4. micro-grid system according to claim 1, it is characterized in that: the accumulator cell charging and discharging controller is placed on the DC voltage booster circuit output, bidirectional, dc high-frequency isolation circuit input end; AC load should be placed the Industrial Frequency Transformer grid side, and grid-connected switch is from net one side; DC load is placed bidirectional, dc high-frequency isolation circuit output end, two-way grid-connected/from net inverter circuit input.
5. micro-grid system according to claim 1, it is characterized in that: what the accumulator cell charging and discharging controller adopted is the design of Bidirectional up-down volt circuit, forward is to charge in batteries, boost and adopt single-phase booster circuit, the accumulator charging/discharging circuit output is connected with micro-grid system booster circuit output, as one of power supply of micro-grid system.
CN 201320076468 2013-01-23 2013-01-23 Bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system CN203368044U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320076468 CN203368044U (en) 2013-01-23 2013-01-23 Bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320076468 CN203368044U (en) 2013-01-23 2013-01-23 Bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system

Publications (1)

Publication Number Publication Date
CN203368044U true CN203368044U (en) 2013-12-25

Family

ID=49815763

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201320076468 CN203368044U (en) 2013-01-23 2013-01-23 Bidirectional ac/dc multi-power-supply multi-load safe-isolation micro electrical network system

Country Status (1)

Country Link
CN (1) CN203368044U (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283493A (en) * 2014-09-29 2015-01-14 苏州克兰兹电子科技有限公司 Power generating device with wind power and solar energy utilized
CN104362612A (en) * 2014-10-21 2015-02-18 广东美的制冷设备有限公司 Power supply system of air conditioner and family micro grid system based on photovoltaic power supply
CN104578166A (en) * 2015-01-29 2015-04-29 国家电网公司 Alternating current-direct current micro-grid system on basis of electricity energy collector
CN104901302A (en) * 2015-06-08 2015-09-09 北京宏光星宇科技发展有限公司 Centralized alternating-current-and-direct-current dual-input direct-current remote power supply system
CN105471387A (en) * 2015-11-26 2016-04-06 中国空间技术研究院 Circuit topology and energy management method of satellite power source system
US10749430B2 (en) 2015-03-13 2020-08-18 Positec Power Tools (Suzhou) Co., Ltd. Power transmission apparatus and control method therefor, and power supply system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283493A (en) * 2014-09-29 2015-01-14 苏州克兰兹电子科技有限公司 Power generating device with wind power and solar energy utilized
CN104362612A (en) * 2014-10-21 2015-02-18 广东美的制冷设备有限公司 Power supply system of air conditioner and family micro grid system based on photovoltaic power supply
CN104578166A (en) * 2015-01-29 2015-04-29 国家电网公司 Alternating current-direct current micro-grid system on basis of electricity energy collector
US10749430B2 (en) 2015-03-13 2020-08-18 Positec Power Tools (Suzhou) Co., Ltd. Power transmission apparatus and control method therefor, and power supply system
CN104901302A (en) * 2015-06-08 2015-09-09 北京宏光星宇科技发展有限公司 Centralized alternating-current-and-direct-current dual-input direct-current remote power supply system
CN105471387A (en) * 2015-11-26 2016-04-06 中国空间技术研究院 Circuit topology and energy management method of satellite power source system
CN105471387B (en) * 2015-11-26 2017-12-22 中国空间技术研究院 The circuit topology and energy management method of a kind of satellite power system

Similar Documents

Publication Publication Date Title
CN102916481B (en) A kind of energy management method of direct current micro-grid system
RU2512880C2 (en) Electric energy accumulation system based on accumulator batteries and supercapacitor with network enhancement function
CN102427266B (en) Multifunctional photovoltaic UPS (uninterruptible power supply) system and control method thereof
CN102545257B (en) Solar photovoltaic generating single-phase grid-connected inverter and control method thereof
CN103545905B (en) A kind of photovoltaic direct-current micro-grid energy coordination control method
CN104065157B (en) Uninterruptible power supply with improved power supply reliability
CN101860270B (en) Access system for adequately utilizing wind energy and solar energy and realization method thereof
CN102510089B (en) Wind and solar micro power grid system
CN103441566A (en) System and method for supplying power cooperatively by mains supply, photovoltaic cell and energy storage battery
CN103427430B (en) A kind of energy management method of mixed energy storage system in microgrid
CN102355042B (en) Super-capacitor-based direct current power device of power station and power supply method thereof
CN102185333B (en) Method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid
WO2014101497A1 (en) Alternating current-direct current hybrid micro-grid system and control method therefor
KR101277185B1 (en) Dc microgrid system and ac/dc hybrid microgrid system using it
CN101826821B (en) Electric energy control method of optical network hybrid power supply uninterruptable inverter
CN104092278B (en) Energy management method applied to photovoltaic energy storage system
CN101599721B (en) Solar power generating system and control method thereof
JP3183815U (en) Solar power supply system with multiple backups
CN201947021U (en) Wind, light and power multi-energy power supply management control system
CN103684214B (en) A kind of multi-mode wind-and-solar electricity generation system
CN102709994A (en) Charge-discharge two-way power converter for battery for electric car
TW201325004A (en) Power management apparatus and method of controlling the same
CN101436778A (en) Networking method for minitype electric network
CN104022527B (en) Direct current micro-grid system
CN202197142U (en) Solar photovoltaic power generation and commercial power mutual standby system

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
DD01 Delivery of document by public notice
DD01 Delivery of document by public notice

Addressee: FOSHAN SHUNDE BUAA ADVANCED TECHNOLOGY INDUSTRY BASE CO., LTD.

Document name: Notification to Pay the Fees

DD01 Delivery of document by public notice
DD01 Delivery of document by public notice

Addressee: FOSHAN SHUNDE BUAA ADVANCED TECHNOLOGY INDUSTRY BASE CO., LTD.

Document name: Notification of Termination of Patent Right

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131225

Termination date: 20170123