CN203883492U - AC-DC hybrid modularized microgrid networking structure based on hybrid energy storage - Google Patents
AC-DC hybrid modularized microgrid networking structure based on hybrid energy storage Download PDFInfo
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- CN203883492U CN203883492U CN201420285966.XU CN201420285966U CN203883492U CN 203883492 U CN203883492 U CN 203883492U CN 201420285966 U CN201420285966 U CN 201420285966U CN 203883492 U CN203883492 U CN 203883492U
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Abstract
The utility model discloses an AC-DC hybrid modularized micro-grid networking structure based on hybrid energy storage. The AC-DC hybrid modularized micro-grid networking structure based on hybrid energy storage is characterized in that a back-to-back current transformer is a grid-side current transformer and a microgrid-side current transformer which are connected in parallel through a DC bus; an AC side of the grid-side current transformer sequentially goes through a filtering loop and an isolation transformer and then is connected to a large grid; a three-phase AC output end of the microgrid-side current transformer goes through an LC filtering circuit and then serves as an AC bus. Beneficial effects are that modularized package of distributed power supplies with various loads and of various types in the AC-DC hybrid microgrid is realized, and the modularized microgrid serves and an independent controllable power/load unit to actively participate in the dispatching and operation of the large grid; and through the reasonable design of the hybrid energy storage system structure and the connection method, a grid connection/islet double-mode seamless switching is enabled to become a natural attribute of the modularized microgrid without using a complex control algorithm.
Description
Technical field
The utility model belongs to micro-electrical network networking and operation control technology field, is specifically related to a kind of alternating current-direct current based on hybrid energy-storing technology and mixes micro-electrical network modularization networking structure.
Background technology
Micro-electrical network is a kind of novel network configuration, to realize initiatively a kind of effective means of power distribution network, the appearance of micro-electrical network will fundamentally change the mode of traditional electrical network reply load growth, and it has great potential at aspects such as reducing energy consumption, raising power system reliability and flexibility.At present, micro-electric power network technique has become the cutting edge technology of power system development, develops and extends the extensive access that micro-electrical network can promote distributed power source and regenerative resource, makes traditional electrical network to intelligent grid transition.
Micro-electrical network is to collect by distributed power source, energy storage device, energy conversion device, relevant load and monitoring, protective device the small-sized electric system of being transported to forming.Power supply in micro-electrical network mostly is the distributed power source that capacity is less, the small unit that contains power electronics interface, comprises the energy storage devices such as miniature gas turbine, fuel cell, photovoltaic cell, small-sized wind power generator group and super capacitor, flywheel and storage battery.A plurality of distributed power sources and related load thereof are according to certain topological structure network consisting and be associated to conventional electrical network by static switch, can realize the highly reliable supply to load various energy resources form.Micro-electrical network be one can realize that oneself controls, the autonomous system of protection and management, both can be incorporated into the power networks with external electrical network, also at electric network fault or while needing, disconnect independent islet operation with large electrical network.For public power enterprise, microgrid can be considered the controlled cell of electric power system, and this cell can be controlled as one simply can dispatch load, can within the several seconds, make response to meet electrical network regulatory demand.For user, microgrid can be used as a customization power supply, to meet users on diversity.Micro-electrical network has autonomy, stable, compatible, flexible, economic feature.Due to the diversity in micro-source in micro-electrical network and the flexibility of combination thereof, the operation of whole system is controlled and is become complicated, the plug and play of micro-grid system and and large electrical network between close friend interactive closely bound up with micro-electrical network group network topological structure.
Typical micro-electrical network networking structure is proposed by CERTS, has comprised two kinds of micro-source mode of connection in structure, a kind ofly for all micro-sources, is all connected on same feeder line, and feeder line top is connected to microgrid bus again; Another kind is that each micro-source forms small power generation system with this locality load respectively, is jointly connected on microgrid bus, is parallel structure.Micro-electrical network concept that CERTS proposes and structure obtained both domestic and externally extensively admitting, is the most popular micro-electric network composition at present.In this structure, when micro-electrical network is incorporated into the power networks, load, energy-storage system, distributed power source are with the parallel running of current source mode, therefore by and the transient state concussion of net state (while particularly there is unplanned isolated island) micro-electrical network busbar voltage in island state transfer process be difficult to avoid, thereby cause load and distributed power source off-grid in transfer process, be difficult to realize the seamless switching of grid-connected/island state.Document < < Advantages and circuit configuration of a DC microgrid > >, < < A benchmark LV microgrid for steady state and transientanalysis > >, < < An update on Sendai demonstration of multiplepower quality supply system > > proposes respectively DC micro-electric net, exchange micro-electrical network, alternating current-direct current mixes the networking plans such as micro-electrical network.Above-mentioned micro-electric network composition has followed micro-electrical network networking thinking of CERTS substantially, all exists the control difficult point in state conversion process.
The utility model patent " construction method of micro-grid system " of Shimizu Corp and Tokyo University's application has proposed a kind of construction method of micro-grid system, for constructing the network of polymorphic type distributed power source unified monitoring, thereby electric power is supplied with in specific region, the method comprises: measure the load change of described specific region, thereby the data of described load change are carried out to the step of frequency analysis; Frequency response characteristic separately based on polymorphic type power supply and determine the frequency of sharing that each power supply undertakes respectively, and accordingly the frequency analysis result of load change is distributed to each power supply.The method depends on the steady and schedulability of the optimal design of control strategy being realized to micro-electric network state conversion, therefore the accuracy of supervisory control system and response speed is had to very high requirement.
The micro-electrical network of tandem type that document < < micro-source inverter is connected in series type microgrid characteristic research > > proposition can reduce output harmonic wave content, the influence of minimizing to power distribution network and load, solve in AC and DC microgrid the problems such as circulation, harmonic wave, frequency, but this structure can not solve plug and play and the steady schedulable problem of micro-electrical network simultaneously effectively.Zhejiang University has applied for mono-kind of the utility model patent < < micro-topological structure of electric > > (publication number CN103219726A) based on energy storage, the hinge of conversion using energy storage device as microgrid energy, is intended to reduce the impact of elimination distributed power source output pulsation electric energy to main electrical network.But, the problem of this utility model patent does not solve micro-electrical network grid-connected/double mode seamless switching of isolated island.
Utility model content
The purpose of this utility model is exactly in order to address the above problem, the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing has been proposed, this structure utilizes back-to-back converter to carry out micro-electrical network networking, complete the modularized encapsulation that alternating current-direct current mixes micro-electrical network, can realize that modular microfluidic electrical network outlet is meritorious, idle independence can be dispatched, improve the global controllability that alternating current-direct current mixes micro-electrical network; Appropriate design mixed energy storage system structure and access way, using it as power/energy buffer cell, make the double mode seamless switching of grid-connected/isolated island become the natural quality of modular microfluidic electrical network.Micro-electrical network networking structure of alternating current-direct current mixing moduleization that should be based on hybrid energy-storing is to realize the regulation and control operation that micro-electrical network initiatively participates in large electrical network to have established architecture basics.
To achieve these goals, the utility model adopts following technical scheme:
The micro-electrical network networking structure of alternating current-direct current mixing moduleization based on hybrid energy-storing, comprising: isolating transformer, filter circuit, back-to-back converter, mixed energy storage system, DC micro-electric net unit and exchange micro-electrical network unit;
Described back-to-back converter comprises grid side current transformer and the microgrid side converter being connected in parallel by DC bus;
The AC of described grid side current transformer accesses in large electrical network after loop, isolating transformer successively after filtering, the three-phase alternating current output of described microgrid side converter after LC filter circuit as micro-electrical network ac bus;
Described mixed energy storage system and DC micro-electric net unit be access DC bus in parallel respectively, exchanges the micro-electrical network ac bus of micro-electrical network unit access in parallel.
Described mixed energy storage system comprises: batteries, bank of super capacitors and two-way DC/DC chopper;
Batteries accesses two-way DC/DC chopper low-pressure side, two-way DC/DC chopper high-pressure side access in parallel bank of super capacitors, and bank of super capacitors is mixed energy storage system external interface, the DC bus in the micro-electrical network of direct access moduleization in parallel.
Described DC micro-electric net unit comprises some direct current distributed power sources and the DC load of access DC bus in parallel.
The micro-electrical network of described interchange unit comprises some interchange distributed power sources and the AC load of incoming transport bus in parallel.
When described large electrical network is the above voltage levels electrical network of 400V, isolating transformer changes to the step-up transformer matching with electrical network access point voltage.
Described grid side current transformer is external unique interface of modular microfluidic electrical network.
Described grid side current transformer and microgrid side converter all adopt three-phase half-bridge VSR topology.
When modular microfluidic electrical network is incorporated into the power networks with large electrical network, grid side current transformer runs on P/Q pattern, controlling the stable of DC bus-bar voltage normally moves to maintain DC micro-electric net unit, microgrid side converter runs on V/F pattern, control micro-electrical network ac bus voltage stabilization and normally move to maintain interchange micro-electrical network unit, mixed energy storage system carries out energy by two-way DC/DC chopper and supplements in real time;
Modular microfluidic electrical network is in the grid-connected transient process that proceeds to island state, grid side current transformer is out of service, bank of super capacitors supports for DC bus provides energy fast, batteries is controlled bank of super capacitors is carried out to energy supplement through two-way chopper, in control switching transient process, DC bus-bar voltage is stable, microgrid side converter normally runs on V/F pattern, finally realize DC micro-electric net unit, exchange the normal operation of micro-electrical network unit in grid-connected/isolated island handoff procedure, realize micro-electrical network grid-connected/the double mode seamless switching of isolated island;
Modular microfluidic electrical network is when island state, grid side current transformer is out of service, mixed energy storage system is handled up by realtime power, control the stable of DC bus-bar voltage, microgrid side converter still runs on V/F pattern, finally realizes DC micro-electric net unit, exchanges the normal operation of micro-electrical network unit under island state.
When modular microfluidic electrical network is incorporated into the power networks with large electrical network, gain merit/reactive power exchange between the micro-electrical network of the accurate control moduleization of grid side current transformer and outside large electrical network, make modular microfluidic electrical network become independent controlled power supply/load module, initiatively participate in large dispatching of power netwoks operation, in this course mixed energy storage system real-Time Compensation grid side current transformer, exchange the power difference between micro-electrical network unit, DC micro-electric net unit three, maintain the internal energy balance of modular microfluidic electrical network.
The beneficial effects of the utility model are:
(1) by back-to-back converter, realize the modularized encapsulation that AC/DC is mixed micro-electrical network, micro-electrical network module can access or exit large electrical network by control interface (grid side current transformer) fast, easily by unique, simplified the networking access scheme of conventional micro-electrical network, and improved the global controllability that alternating current-direct current mixes micro-electrical network, architecture basics has been established in the regulation and control operation that initiatively participates in large electrical network for realizing micro-electrical network.
(2) due to mixed energy storage system fast, lasting energy/power supports, it is stable that modular microfluidic electrical network can maintain all the time its DC bus-bar voltage in the transient process of carrying out grid-connected/double mode switching of isolated island, the pattern that realized is switched polymorphic type distributed power source in modular microfluidic electrical network, polymorphic type load " zero " impacts, make seamless switching become the natural quality of modular microfluidic electrical network, without back-to-back converter and each distributed power source, participate in controlling, simplified control logic, reached modular microfluidic electrical network plug and play, the purpose of design of seamless switching, avoided realizing in conventional micro-electrical network networking plan the demand of the double mode seamless switching of grid-connected/isolated island to all kinds of distributed power source grid-connected converter complex control algorithms.
(3) when micro-electrical network is incorporated into the power networks, grid side current transformer can carry out independent bidirectional modulation to micro-electrical network outlet active power, reactive power, make micro-electrical network become independent schedulable many characteristics power supply/load cell with respect to large electrical network, initiatively participate in voltage, the frequency adjustment of electrical network, " close friend " the interactive and mutual support between realization and large electrical network.
Accompanying drawing explanation
Fig. 1 is that the alternating current-direct current of the utility model based on hybrid energy-storing mixes micro-electrical network modularization group network topological structure figure;
Fig. 2 is the utility model grid side/microgrid side converter structure chart;
Fig. 3 is the utility model storage battery-super capacitor mixed energy storage system construction drawing.
Wherein, 1, isolating transformer (or step-up transformer), 2, grid side current transformer, 3, DC bus; 4, filter circuit, 5, storage battery-super capacitor mixed energy storage system, 6, DC micro-electric net unit, 7, microgrid side converter, 8, exchange micro-electrical network unit, 9, batteries, 10, two-way DC/DC chopper, 11, bank of super capacitors, 12, direct current distributed power source, 13, DC load, 14, exchange distributed power source, 15, AC load.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
As shown in Figure 1, this modularization alternating current-direct current mix micro-topological structure of electric by isolating transformer (or step-up transformer) 1, grid side current transformer 2, DC bus 3, filter circuit 4, storage battery-super capacitor mixed energy storage system 5, DC micro-electric net unit 6, microgrid side converter 7, exchange micro-electrical network unit 8 and form.
Grid side current transformer 2 is micro-electrical network external interface for modularization alternating current-direct current mixes, and its AC is in parallel with large electrical network through filter circuit 4 and isolating transformer (or step-up transformer) 1.When modular microfluidic electrical network is incorporated into the power networks, grid side current transformer 2 is controlled and is maintained the stable of DC bus 3 voltages, ensures the stable operation that exchanges micro-electrical network unit 8, DC micro-electric net unit 6, and the micro-electrical network of while control moduleization participates in large operation of power networks and controls; When modular microfluidic electrical network islet operation, the micro-electrical network of grid side current transformer 2 control moduleization and large grid disconnection.
Microgrid side converter 7 exchanges output as the ac bus that exchanges micro-electrical network unit 8, ac bus with exchanges distributed power source 14 and the common composition interchange of AC load 15 micro-electrical network unit 8.Microgrid side converter 7 runs on V/F pattern all the time, and the three-phase alternating voltage of AC output amplitude, frequency stabilization ensures and exchanges being incorporated into the power networks all the time of distributed power source and AC load.
Grid side current transformer 2 is connected by DC bus 3 with microgrid side converter 7, accesses direct current distributed power source 12 and DC load 13 formation DC micro-electric net units 6 in DC bus 3 simultaneously.
Storage battery-super capacitor mixed energy storage system 5 supports and buffer cell as modular microfluidic power grid energy/power, access DC bus 3 in parallel.Modular microfluidic electrical network carries out in the double mode handoff procedure of grid-connected/isolated island, and storage battery-super capacitor mixed energy storage system 5 Quicks support for power, maintains the stable of DC bus-bar voltage 3, ensures the realization of grid-connected/double mode seamless switching of isolated island.When modular microfluidic electrical network is incorporated into the power networks, power difference between storage battery-super capacitor mixed energy storage system 5 real-Time Compensation grid side current transformers 2, microgrid side converter 7 and DC micro-electric net unit 6 threes, maintain the energy balance of modular microfluidic electrical network inside, the micro-electrical network of assurance moduleization as one independently power supply/load module initiatively participate in the management and running of large electrical network.During modular microfluidic electrical network islet operation, power difference between storage battery super capacitor mixed energy storage system 5 real-Time Compensation DC micro-electric net units 6 and microgrid side converter 7, maintain the stable of DC bus-bar voltage, ensure DC micro-electric net unit 6 under island state, exchange the stable operation of micro-electrical network unit 8.
As shown in Figure 2, grid side current transformer 2 all adopts three-phase half-bridge VSR topology with microgrid side converter 7.The drain electrode of power switch pipe G1, G3, G5 connects together the positive pole of receiving DC bus capacitor C1, the source electrode of power switch pipe G1, G3, G5 is connected with the drain electrode of power switch pipe G2, G4, G6 respectively, and the source electrode of power switch pipe G2, G4, G6 connects together the negative pole of receiving DC bus capacitor C2.Sustained diode 1, D3, D5, D2, D4, D6 distinguish inverse parallel in the leakage of each power switch pipe--between source electrode.L1, L2, L3 are AC filter inductance. by above each switching tube is carried out break-make control can realize the fast and flexible conversion of this converter rectification state, inverter mode and DC voltage, AC meritorious/accurately the controlling fast of reactive power.
Storage battery-super capacitor mixed energy storage system 5 adopts active parallel-connection type structure, as shown in Figure 3.The low-pressure side of the two-way DC/DC chopper 10 of batteries 9 access, bank of super capacitors 11 is in parallel with the high-pressure side of two-way DC/DC chopper 10.In this mixed energy storage system, the external output interface that bank of super capacitors 11 is mixed energy storage system, the DC bus 3 of the micro-electrical network of direct access moduleization in parallel, its charge and discharge process is controlled without two-way DC/DC chopper 10, the autonomous power demand of the micro-electrical network of respond moduleization inside, provide energy in short-term to support, for modular microfluidic electrical network grid-connected/condition that the double mode seamless switching of isolated island is created, given full play to ultracapacitor and discharged and recharged the advantage that fast response time, power density are large, have extended cycle life.Batteries 9 is controlled bank of super capacitors 11 is carried out to real-time energy supplement through two-way DC/DC chopper 10, maintain the stable of DC bus-bar voltage, the long-term stability operation of the micro-electrical network of assurance moduleization under grid-connected or island state, makes the advantage that storage battery energy density is large obtain performance.
In storage battery-super capacitor mixed energy storage system 5, two-way DC/DC chopper 10 has adopted the two-way DC/DC chopper topology of BUCK-BOOST type, as shown in Figure 3.Two-way DC/DC chopper 10 is by energy storage inductor L4, power switch pipe G7, G8, and sustained diode 7, D8 form.Batteries 9 positive poles are received the leakage level of power switch pipe G7, the source class of power switch pipe G8 through energy storage inductor L4, the negative pole of the source electrode access batteries 9 of power switch pipe G7, the positive pole of the drain electrode access bank of super capacitors 11 of power switch pipe G8, sustained diode 7, D8 are connected in anti-parallel to the leakage of power switch pipe G7, G8--between source class.By the break-make of power switch pipe G7, G8 is controlled, can realize quick, the accurate two-way flexible of energy between low-pressure side and high-pressure side.
The features such as the power switch pipe of grid side current transformer 2, microgrid side converter 7, two-way DC/DC chopper 10 can be selected insulated gate bipolar transistor (IGBT), and it is a kind of turn-off device, has switching response speed fast, and conduction voltage drop is low.Can adopt IPM power model in actual use; IPM inside on the basis of integrated IGBT and anti-paralleled diode thereof also with driving, logic, control, detection and protective circuit; not only reduced the volume of system; shortened the development time; also strengthen the reliability of system, adapted to the developing direction of current power device.
Although above-mentioned, by reference to the accompanying drawings embodiment of the present utility model is described; but the not restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (7)
1. the micro-electrical network networking structure of the alternating current-direct current mixing moduleization based on hybrid energy-storing, is characterized in that, comprising: isolating transformer, filter circuit, back-to-back converter, mixed energy storage system, DC micro-electric net unit and exchange micro-electrical network unit;
Described back-to-back converter comprises grid side current transformer and the microgrid side converter being connected in parallel by DC bus;
The AC of described grid side current transformer accesses in large electrical network after loop, isolating transformer successively after filtering, the three-phase alternating current output of described microgrid side converter after LC filter circuit as micro-electrical network ac bus;
Described mixed energy storage system and DC micro-electric net unit be access DC bus in parallel respectively, exchanges the micro-electrical network ac bus of micro-electrical network unit access in parallel.
2. the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing as claimed in claim 1, is characterized in that, described mixed energy storage system comprises: batteries, bank of super capacitors and two-way DC/DC chopper;
Batteries accesses two-way DC/DC chopper low-pressure side, two-way DC/DC chopper high-pressure side access in parallel bank of super capacitors, and bank of super capacitors is mixed energy storage system external interface, the DC bus in the micro-electrical network of direct access moduleization in parallel.
3. the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing as claimed in claim 1, is characterized in that, described DC micro-electric net unit comprises some direct current distributed power sources and the DC load of access DC bus in parallel.
4. the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing as claimed in claim 1, is characterized in that, the micro-electrical network of described interchange unit comprises some interchange distributed power sources and the AC load of incoming transport bus in parallel.
5. the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing as claimed in claim 1, it is characterized in that, when described large electrical network is the above voltage levels electrical network of 400V, isolating transformer changes to the step-up transformer matching with electrical network access point voltage.
6. the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing as claimed in claim 1, is characterized in that, described grid side current transformer is external unique interface of modular microfluidic electrical network.
7. the micro-electrical network networking structure of a kind of alternating current-direct current mixing moduleization based on hybrid energy-storing as claimed in claim 1, is characterized in that, described grid side current transformer and microgrid side converter all adopt three-phase half-bridge VSR topology.
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| CN201420285966.XU CN203883492U (en) | 2014-05-29 | 2014-05-29 | AC-DC hybrid modularized microgrid networking structure based on hybrid energy storage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099948A (en) * | 2016-08-30 | 2016-11-09 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and control method thereof |
| CN108512240A (en) * | 2018-05-15 | 2018-09-07 | 镇江市产品质量监督检验中心 | A kind of hybrid energy-storing source current chop control system |
| CN110311379A (en) * | 2019-07-23 | 2019-10-08 | 国网河南省电力公司经济技术研究院 | A kind of functional module micro-grid and flexible modulation method |
-
2014
- 2014-05-29 CN CN201420285966.XU patent/CN203883492U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099948A (en) * | 2016-08-30 | 2016-11-09 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and control method thereof |
| CN106099948B (en) * | 2016-08-30 | 2018-04-03 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and its control method |
| CN108512240A (en) * | 2018-05-15 | 2018-09-07 | 镇江市产品质量监督检验中心 | A kind of hybrid energy-storing source current chop control system |
| CN110311379A (en) * | 2019-07-23 | 2019-10-08 | 国网河南省电力公司经济技术研究院 | A kind of functional module micro-grid and flexible modulation method |
| CN110311379B (en) * | 2019-07-23 | 2020-10-16 | 国网河南省电力公司经济技术研究院 | Functional modular microgrid networking and flexible regulation and control method |
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