CN104218840A - Micro-grid energy storage topological inverter and method for operating same - Google Patents
Micro-grid energy storage topological inverter and method for operating same Download PDFInfo
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- CN104218840A CN104218840A CN201410152144.9A CN201410152144A CN104218840A CN 104218840 A CN104218840 A CN 104218840A CN 201410152144 A CN201410152144 A CN 201410152144A CN 104218840 A CN104218840 A CN 104218840A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims abstract description 80
- 230000000875 corresponding Effects 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 12
- 238000007667 floating Methods 0.000 claims description 6
- 238000000844 transformation Methods 0.000 claims description 6
- 230000001131 transforming Effects 0.000 claims description 6
- 230000002457 bidirectional Effects 0.000 abstract 5
- 238000002955 isolation Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001172 regenerating Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Abstract
The invention relates to a micro-grid energy storage topological inverter and a method for operating the same. The micro-grid energy storage topological inverter comprises a controller and an isolation transformer applicable to being connected with a three-phase power source. Three output phases of the isolation transformer are respectively connected with a first four-quadrant H-bridge converter, a second four-quadrant H-bridge converter and a third four-quadrant H-bridge converter, direct-current sides of the first four-quadrant H-bridge converter, the second four-quadrant H-bridge converter and the third four-quadrant H-bridge converter are connected with one another in parallel and then are connected with a first bidirectional DC/DC transducer and a second bidirectional DC/DC transducer, the first bidirectional DC/DC transducer is connected with a storage battery, and the second bidirectional DC/DC transducer is connected with a super capacitor. The micro-grid energy storage topological inverter and the method have the advantages that the storage battery and the super capacitor can be respectively charged and discharged by the three four-quadrant H-bridge converters and the two bidirectional DC/DC transducers under the control of the controller, so that micro-grid energy storage and feedback effects can be realized, and corresponding charge and discharge forms can be controlled according to charge and discharge characteristics of the storage battery and the super capacitor.
Description
Technical field
The present invention relates to a kind of inverter, particularly refer to a kind of microgrid energy storage topology inverter and method of work.
Background technology
Along with the old general layout of the centralized and unified formula of continuous increase electrical network of power load makes electrical network further fragile.Therefore need to increase distributed energy structure to improve the reliability of electrical network, ensure popular daily electricity consumption and industrial or agricultural electricity consumption etc.In addition; Distributed energy can realize energy-saving consumption-reducing better, is conducive to utilization and the popularization of clean energy resource and regenerative resource.But when electric power system is broken down, distributed power source must be at once out of service.Which greatly limits giving full play to of distributed energy usefulness.For coordinating the contradiction between bulk power grid and distributed power source, there has been proposed the concept of microgrid.Microgrid forms the electric power system of load by distributed power source, distributed energy storage and energy management module, forms an independent controllable system, completely solve the contradiction between bulk power grid and distributed power source together with load.Energy-storage system regulates micro battery performance, the important step of guaranteed load power supply quality.Existing energy storage inverter mostly adopts the topological structure of three-phase inverter form, to severe three-phase unbalanced load, controls complicated, realizes difficulty.
Summary of the invention
The object of this invention is to provide a kind of microgrid energy storage topology inverter, this inverter solves the even voltage harmonics of each four-quadrant H bridge current transformer DC side output to the technical problem of the impact of VD.
In order to solve the problems of the technologies described above, the invention provides a kind of microgrid energy storage topology inverter, comprise: the three-phase output of controller, the isolating transformer being suitable for connecting three phase mains, this isolating transformer connects first, second, third four-quadrant H bridge current transformer respectively, first, second two-way DC/DC converter is connected with after the DC side parallel of described first, second, third four-quadrant H bridge current transformer, described first two-way DC/DC converter connects storage battery, and described second two-way DC/DC converter connects super capacitor.
The present invention also solves the technical problem of storage battery and super capacitor energy-storage and feedback further.
In order to solve the problems of the technologies described above, on the basis of above-mentioned microgrid energy storage topology inverter, described microgrid energy storage topology inverter also comprises: controller, under energy storage pattern, described controller controls each four-quadrant H bridge current transformer and respectively each cross streams electricity is transformed into corresponding direct current and inputs to described first, second two-way DC/DC converter, described controller is more respectively according to the power division storage battery of storage battery and super capacitor, the given value of current value of super capacitor and voltage given value, pass through storage battery, the given value of current value of super capacitor controls described first respectively, second two-way DC/DC converter is to storage battery, super capacitor carries out constant current charge, again according to storage battery, the voltage given value of super capacitor controls described first respectively, second two-way DC/DC converter is to storage battery, super capacitor carries out constant voltage charge, finally control first respectively again, second two-way DC/DC converter is to storage battery, super capacitor carries out floating charge, under feedback pattern, described controller is according to storage battery, the given value of current value of super capacitor controls described first respectively, second two-way DC/DC converter limits storage battery, the discharging current of super capacitor, storage battery, the discharging current of super capacitor is respectively through first, second two-way DC/DC circuit transformations is input to each four-quadrant H bridge current transformer after corresponding direct current, the direct current of input is transformed into each cross streams electricity and exports by each four-quadrant H bridge current transformer again.
Further, the input of described first, second, third four-quadrant H bridge current transformer is connected to first, second, third reactor and first, second, third filter capacitor, and the output of first, second two-way DC/DC converter described is connected to the 4th, the 5th reactor.
In order to solve the technical problem of described storage battery and super capacitor energy-storage and feedback.
Present invention also offers the method for work of a kind of microgrid energy storage topology inverter, wherein, described microgrid energy storage topology inverter comprises: the three-phase output of controller, the isolating transformer being suitable for connecting three phase mains, this isolating transformer connects first, second, third four-quadrant H bridge current transformer respectively, first, second two-way DC/DC converter is connected with after the DC side parallel of described first, second, third four-quadrant H bridge current transformer, described first two-way DC/DC converter connects storage battery, and described second two-way DC/DC converter connects super capacitor.
The method of work of described microgrid energy storage topology inverter, comprising:
Under energy storage pattern, described controller controls each four-quadrant H bridge current transformer and respectively each cross streams electricity is transformed into corresponding direct current and inputs to first, second two-way DC/DC converter described, described controller, more respectively according to storage battery and the power division storage battery of super capacitor, the given value of current value of super capacitor and voltage given value, controls first, second two-way DC/DC converter described respectively by the given value of current value of storage battery, super capacitor and carries out constant current charge to storage battery, super capacitor; Control first, second two-way DC/DC converter described respectively according to the voltage given value of storage battery, super capacitor again and constant voltage charge is carried out to storage battery, super capacitor, finally control first, second two-way DC/DC converter more respectively and floating charge is carried out to storage battery, super capacitor.
Under feedback pattern, described controller controls according to the given value of current value of storage battery, super capacitor the discharging current that first, second two-way DC/DC converter described limits storage battery, super capacitor respectively, the discharging current of storage battery, super capacitor inputs to each four-quadrant H bridge current transformer respectively after first, second two-way DC/DC circuit transformations is corresponding direct current, and the direct current of input is transformed into each cross streams electricity and exports by each four-quadrant H bridge current transformer again.
Technique scheme of the present invention has the following advantages compared to existing technology: (1) the present invention is by three four-quadrant H bridge current transformers, and two two-way DC/DC converters by controller control respectively to storage battery, super capacitor carry out discharge and recharge, to realize energy storage and the feedback of microgrid, and according to the feature of storage battery, super capacitor discharge and recharge, control corresponding discharge and recharge form; Three windings of (2) three independently four-quadrant H bridge current transformer and three-phase transformers connect, and make every phase voltage, electric current and power can independent regulation, are convenient to the control of three-phase balancing load; (3) four-quadrant H bridge current transformer DC side direct current connection altogether, compared with H bridge independent direct current, the even voltage harmonics of direct current component is just in time cancelled out each other, DC voltage stability, fluctuates without secondary.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the main circuit topological structure figure of microgrid energy storage of the present invention topology inverter;
Fig. 2 is the circuit diagram of four-quadrant H bridge current transformer of the present invention;
Fig. 3 is the circuit diagram of two-way DC/DC converter of the present invention.
Wherein, circuit breaker Q F1, isolating transformer T, the first four-quadrant H bridge current transformer A, the second four-quadrant H bridge current transformer B, the 3rd four-quadrant H bridge current transformer C, the first two-way DC/DC converter D, the second two-way DC/DC converter E, storage battery 1, super capacitor 2.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
Embodiment 1
See Fig. 1 to Fig. 3, a kind of microgrid energy storage topology inverter, comprise: the three-phase output of circuit breaker Q F1, controller, the isolating transformer T being suitable for connecting three phase mains, this isolating transformer T connects first, second, third four-quadrant H bridge current transformer respectively, first, second two-way DC/DC converter is connected with after the DC side parallel of described first, second, third four-quadrant H bridge current transformer, described first two-way DC/DC converter connects storage battery 1, and described second two-way DC/DC converter connects super capacitor 2.
Described isolating transformer T mono-aspect plays buffer action, raises input voltage on the other hand to improve back end DC busbar voltage, and the harmonic wave that filter civil power and transformer thereof bring.
Embodiment 2
In order to the feature according to storage battery and super capacitor discharge and recharge, namely super capacitor charging rate is faster than charge in batteries speed, on the basis of above-mentioned microgrid energy storage topology inverter, described microgrid energy storage topology inverter also comprises: controller, namely control under first, second two-way DC/DC converter regulates energy storage and feedback pattern by described controller, to the discharge and recharge of storage battery 1 and super capacitor 2.
Concrete, under energy storage pattern, described controller controls each four-quadrant H bridge current transformer and respectively each cross streams electricity is transformed into corresponding direct current and inputs to first, second two-way DC/DC converter described, described controller, more respectively according to storage battery 1 and the power division storage battery of super capacitor 2, the given value of current value of super capacitor and voltage given value, controls first, second two-way DC/DC converter described respectively by the given value of current value of storage battery 1, super capacitor 2 and carries out constant current charge to storage battery 1, super capacitor 2; Control first, second two-way DC/DC converter described respectively according to the voltage given value of storage battery 1, super capacitor 2 again and constant voltage charge is carried out to storage battery 1, super capacitor 2, finally control first, second two-way DC/DC converter more respectively and floating charge is carried out to storage battery 1, super capacitor 2.
Under feedback pattern, described controller controls according to the given value of current value of storage battery 1, super capacitor 2 discharging current that first, second two-way DC/DC converter described limits storage battery 1, super capacitor 2 respectively, the discharging current of storage battery 1, super capacitor 2 inputs to each four-quadrant H bridge current transformer respectively after first, second two-way DC/DC circuit transformations is corresponding direct current, and the direct current of input is transformed into each cross streams electricity and exports by each four-quadrant H bridge current transformer again.
The input of described first, second, third four-quadrant H bridge current transformer is connected to first, second, third reactor and first, second, third filter capacitor, and the output of first, second two-way DC/DC converter described is connected to the 4th, the 5th reactor.
Wherein, described controller adopts the technical scheme of a kind of 100KVA microgrid energy storage two way convertor middle controller disclosed in Chinese patent literature CN 102055358 B; Middle controller of the present invention also can adopt EMS EMS to realize, and such as, in a kind of on-line load simulation method of power system disclosed in Chinese patent literature CN 101777765 B, has relevant discussion to EMS EMS.
Described storage battery adopts lithium battery.
Embodiment 3
In embodiment 1 and embodiment 2 basis, present invention also offers the method for work of a kind of microgrid energy storage topology inverter, wherein, described microgrid energy storage topology inverter comprises: controller, be suitable for the isolating transformer connecting three phase mains, the three-phase of this isolating transformer exports and connects first respectively, second, 3rd four-quadrant H bridge current transformer, described first, second, first is connected with after the DC side parallel of the 3rd four-quadrant H bridge current transformer, second two-way DC/DC converter, described first two-way DC/DC converter connects storage battery 1, described second two-way DC/DC converter connects super capacitor 2.
The method of work of described microgrid energy storage topology inverter, comprising:
Under energy storage pattern, described controller controls each four-quadrant H bridge current transformer and respectively each cross streams electricity is transformed into corresponding direct current and inputs to first, second two-way DC/DC converter described, described controller, more respectively according to storage battery 1 and the power division storage battery 1 of super capacitor 2, the given value of current value of super capacitor 2 and voltage given value, controls first, second two-way DC/DC converter described respectively by the given value of current value of storage battery 1, super capacitor 2 and carries out constant current charge to storage battery 1, super capacitor 2; Control first, second two-way DC/DC converter described respectively according to the voltage given value of storage battery 1, super capacitor 2 again and constant voltage charge is carried out to storage battery 1, super capacitor 2, finally control first, second two-way DC/DC converter more respectively and floating charge is carried out to storage battery 1, super capacitor 2.
Under feedback pattern, described controller controls according to the given value of current value of storage battery 1, super capacitor 2 discharging current that first, second two-way DC/DC converter described limits storage battery 1, super capacitor 2 respectively, the discharging current of storage battery 1, super capacitor 2 inputs to each four-quadrant H bridge current transformer respectively after first, second two-way DC/DC circuit transformations is corresponding direct current, and the direct current of input is transformed into each cross streams electricity and exports by each four-quadrant H bridge current transformer again.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And these belong to spirit institute's apparent change of extending out of the present invention or change and are still among protection scope of the present invention.
Claims (4)
1. a microgrid energy storage topology inverter, is characterized in that comprising: be suitable for connecting the isolating transformer of three phase mains, the three-phase of this isolating transformer exports and connects first, second, third four-quadrant H bridge current transformer respectively,
Be connected with first, second two-way DC/DC converter after the DC side parallel of described first, second, third four-quadrant H bridge current transformer, described first two-way DC/DC converter connects storage battery, and described second two-way DC/DC converter connects super capacitor.
2. microgrid energy storage topology inverter according to claim 1, is characterized in that,
Described microgrid energy storage topology inverter also comprises: controller,
Under energy storage pattern, described controller controls each four-quadrant H bridge current transformer and respectively each cross streams electricity is transformed into corresponding direct current and inputs to first, second two-way DC/DC converter described, described controller, more respectively according to storage battery and the power division storage battery of super capacitor, the given value of current value of super capacitor and voltage given value, controls first, second two-way DC/DC converter described respectively by the given value of current value of storage battery, super capacitor and carries out constant current charge to storage battery, super capacitor; Control first, second two-way DC/DC converter described respectively according to the voltage given value of storage battery, super capacitor again and constant voltage charge is carried out to storage battery, super capacitor, finally control first, second two-way DC/DC converter more respectively and floating charge is carried out to storage battery, super capacitor;
Under feedback pattern, described controller controls according to the given value of current value of storage battery, super capacitor the discharging current that first, second two-way DC/DC converter described limits storage battery, super capacitor respectively, the discharging current of storage battery, super capacitor inputs to each four-quadrant H bridge current transformer respectively after first, second two-way DC/DC circuit transformations is corresponding direct current, and the direct current of input is transformed into each cross streams electricity and exports by each four-quadrant H bridge current transformer again.
3. microgrid energy storage topology inverter according to claim 1, it is characterized in that, the input of described first, second, third four-quadrant H bridge current transformer is connected to first, second, third reactor and first, second, third filter capacitor,
The output of first, second two-way DC/DC converter described is connected to the 4th, the 5th reactor.
4. a method of work for microgrid energy storage topology inverter, is characterized in that,
Described microgrid energy storage topology inverter comprises: the three-phase output of controller, the isolating transformer being suitable for connecting three phase mains, this isolating transformer connects first, second, third four-quadrant H bridge current transformer respectively,
Be connected with first, second two-way DC/DC converter after the DC side parallel of described first, second, third four-quadrant H bridge current transformer, described first two-way DC/DC converter connects storage battery, and described second two-way DC/DC converter connects super capacitor;
The method of work of described microgrid energy storage topology inverter, comprising:
Under energy storage pattern, described controller controls each four-quadrant H bridge current transformer and respectively each cross streams electricity is transformed into corresponding direct current and inputs to first, second two-way DC/DC converter described, described controller, more respectively according to storage battery and the power division storage battery of super capacitor, the given value of current value of super capacitor and voltage given value, controls first, second two-way DC/DC converter described respectively by the given value of current value of storage battery, super capacitor and carries out constant current charge to storage battery, super capacitor; Control first, second two-way DC/DC converter described respectively according to the voltage given value of storage battery, super capacitor again and constant voltage charge is carried out to storage battery, super capacitor, finally control first, second two-way DC/DC converter more respectively and floating charge is carried out to storage battery, super capacitor;
Under feedback pattern, described controller controls according to the given value of current value of storage battery, super capacitor the discharging current that first, second two-way DC/DC converter described limits storage battery, super capacitor respectively, the discharging current of storage battery, super capacitor inputs to each four-quadrant H bridge current transformer respectively after first, second two-way DC/DC circuit transformations is corresponding direct current, and the direct current of input is transformed into each cross streams electricity and exports by each four-quadrant H bridge current transformer again.
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| CN105141170A (en) * | 2015-09-18 | 2015-12-09 | 江苏同芯电气科技有限公司 | Long pulse large power high voltage power supply |
| CN106208793A (en) * | 2015-04-30 | 2016-12-07 | 深圳市健网科技有限公司 | A kind of AC-DC translation circuit and converting power source |
| CN106505601A (en) * | 2016-11-02 | 2017-03-15 | 广东电网有限责任公司电力科学研究院 | A kind of intelligent load device and power transmission line intelligent load system |
| CN110943469A (en) * | 2019-12-18 | 2020-03-31 | 国网智能科技股份有限公司 | Single-stage energy storage converter and control method thereof |
| CN111030152A (en) * | 2019-12-18 | 2020-04-17 | 国网智能科技股份有限公司 | Energy storage converter system and control method thereof |
| CN111585433A (en) * | 2020-05-07 | 2020-08-25 | 国网重庆市电力公司电力科学研究院 | Universal interface, control method and energy storage system |
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| CN103267915A (en) * | 2013-05-13 | 2013-08-28 | 周细文 | H-bridge structure anti-islanding detection test loading device |
| CN203233315U (en) * | 2013-05-08 | 2013-10-09 | 周细文 | Alternating current power supply for simulating characteristics of power grid |
| CN103490524A (en) * | 2013-09-16 | 2014-01-01 | 江苏大学 | Large-scale hybrid energy storage system and control strategy thereof |
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| CN203233315U (en) * | 2013-05-08 | 2013-10-09 | 周细文 | Alternating current power supply for simulating characteristics of power grid |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208793A (en) * | 2015-04-30 | 2016-12-07 | 深圳市健网科技有限公司 | A kind of AC-DC translation circuit and converting power source |
| CN105141170A (en) * | 2015-09-18 | 2015-12-09 | 江苏同芯电气科技有限公司 | Long pulse large power high voltage power supply |
| CN106505601A (en) * | 2016-11-02 | 2017-03-15 | 广东电网有限责任公司电力科学研究院 | A kind of intelligent load device and power transmission line intelligent load system |
| CN110943469A (en) * | 2019-12-18 | 2020-03-31 | 国网智能科技股份有限公司 | Single-stage energy storage converter and control method thereof |
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| CN110943469B (en) * | 2019-12-18 | 2021-12-07 | 山东鲁软数字科技有限公司智慧能源分公司 | Single-stage energy storage converter and control method thereof |
| CN111585433A (en) * | 2020-05-07 | 2020-08-25 | 国网重庆市电力公司电力科学研究院 | Universal interface, control method and energy storage system |
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