CN203251228U - Bidirectional energy storage converter - Google Patents
Bidirectional energy storage converter Download PDFInfo
- Publication number
- CN203251228U CN203251228U CN 201320177685 CN201320177685U CN203251228U CN 203251228 U CN203251228 U CN 203251228U CN 201320177685 CN201320177685 CN 201320177685 CN 201320177685 U CN201320177685 U CN 201320177685U CN 203251228 U CN203251228 U CN 203251228U
- Authority
- CN
- China
- Prior art keywords
- converter
- bidirectional
- phase
- bridge
- isolation type
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a bidirectional energy storage converter which comprises a three-phase cascade type level inverter and a plurality of isolated bidirectional DC/DC converters. The number of the isolated bidirectional DC/DC converters is same with the number of H bridges in the three-phase cascade type level inverter. Furthermore the DC/DC converters and the H bridges are in one-to-one correspondence connection. The connection relationship between the DC/DC converters and the H bridges is characterized in that: the DC input end of each isolated bidirectional DC/DC converter is connected with an accumulator, and the DC output end is connected with a DC input end of the corresponding H bridge; and the AC output end of the three-phase cascade type level inverter is connected with a power network. The bidirectional energy storage converter with the structure is suitable for low-voltage large-current charging/discharging occasion, and furthermore has the following functions: greatly improving efficiency of the converter, reducing volume of the converter, improving power density and easily realizing modularization.
Description
Technical field
The utility model belongs to the electric circuit electronics technical technology, particularly a kind of bidirectional energy-storage converter structure.
Background technology
Development along with new energy technology; the scale of generation of electricity by new energy is also soaring fast; but the intrinsic randomness of the renewable energy power generation such as wind-powered electricity generation, solar energy self, Intermittent Features; determined that its large-scale development will inevitably bring appreciable impact to peak load regulation network and system safety operation, must have advanced energy storage technology to support.
Bidirectional energy-storage current transformer (Power Conversion System is called for short PCS) is the bidirectional energy transmission that realizes between dc energy storage battery and the AC network, energy-storage battery is accessed the key equipment of electric power system.The efficient of two way convertor has determined the utilance of energy storage, has also greatly affected development and the application scale of following energy storage technology.
The extensive energy-storage battery of comparative maturity has sodium-sulphur battery and flow battery etc. at present, the characteristics of this class battery are that its capacity is large, output voltage is lower and charging and discharging currents is larger, be generally and satisfy its charge-discharge characteristic curve, the general circuit arrangement that all adopts the two-way DC/DC converter+three phase full bridge of buck/boost+Industrial Frequency Transformer, must reduce switching frequency for the efficient that improves converter in this scheme, must increase the filtering link again for satisfying the performance index that are incorporated into the power networks simultaneously, finally cause the increase of cost and volume.
The utility model content
The purpose of this utility model is to provide a kind of bidirectional energy-storage current transformer, and it is applicable to low-voltage, high-current and discharges and recharges occasion, can greatly improve the efficient of current transformer, reduces simultaneously the volume of current transformer, improves power density, and is easy to realize modularization.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of bidirectional energy-storage current transformer, comprise a three-phase cascade multilevel inverter and several isolation type bidirectionals DC/DC converter, the number of described isolation type bidirectional DC/DC converter is identical with the number of H bridge in the three-phase cascade multilevel inverter, and DC/DC converter and H bridge connect one to one, concrete annexation is: the direct-flow input end of each isolation type bidirectional DC/DC converter all connects storage battery, and dc output end connects the direct-flow input end of the H bridge corresponding with it, the ac output end access electrical network of described three-phase cascade multilevel inverter.
Above-mentioned each isolation type bidirectional DC/DC converter is two half-bridge structures, and low-pressure side is connected with an inductance.
Above-mentioned electrical network adopts three-phase three-wire system or three-phase four-wire system.
After adopting such scheme, prime of the present utility model adopts isolation type bidirectional DC/DC converter, uses high-frequency isolation transformer to substitute Industrial Frequency Transformer, has greatly reduced overall volume; The rear class of described current transformer adopts cascade multilevel inverter, has improved the equivalent switching frequency of inverter by phase-shifting carrier wave, thereby reduces switching loss, improves inverter efficiency.The utility model is applicable to the low-voltage, high-currents such as flow battery, sodium-sulphur battery and discharges and recharges occasion, and circuit efficiency is high, and volume is little, is easy to realize modularization, has higher practical value.
Description of drawings
Fig. 1 is the circuit topology figure of the three-phase cascade multilevel inverter of Y-connection in the utility model;
Fig. 2 is the circuit topology figure of isolation type bidirectional DC/DC converter in the utility model;
Fig. 3 is circuit topology figure of the present utility model.
Embodiment
Below with reference to accompanying drawing, the technical solution of the utility model is elaborated.
As shown in Figure 3, the utility model provides a kind of bidirectional energy-storage current transformer, comprise a three-phase cascade multilevel inverter and several isolation type bidirectionals DC/DC converter, the number of described isolation type bidirectional DC/DC converter is identical with the number of H bridge in the three-phase cascade multilevel inverter, and DC/DC converter and H bridge connect one to one, concrete annexation is: the direct-flow input end of each isolation type bidirectional DC/DC converter all connects storage battery, the direct-flow input end of all isolation type bidirectional DC/DC converters consists of relation in parallel, and the dc output end of isolation type bidirectional DC/DC converter connects the direct-flow input end of the H bridge corresponding with it, the ac output end access electrical network of described three-phase cascade multilevel inverter, it can be three-phase three-wire system, also can be three-phase four-wire system, the cascade number depends on the size of line voltage.
In the utility model, isolation type bidirectional DC/DC converter is used for accumulator cell charging and discharging control, the common DC input, but direct current output is mutually isolation, and adopt phase-shifting carrier wave PWM control, thereby improved equivalent switching frequency, reduce direct current charging and discharging currents ripple.
Described three-phase cascade multilevel inverter is Y-connection, whenever is comprised of the cascade of a plurality of H bridge, and this three-phase cascade multilevel inverter is used for grid-connected current and the power that is incorporated into the power networks are controlled, and also will realize simultaneously the dc capacitor voltage balance is controlled.
The utility model is comprised of isolation type bidirectional DC/DC converter and three-phase cascade multilevel inverter 2 stage converter, it realizes discharging and recharging of storage battery controlled and grid-connected current control by the coordination control of 2 stage converter, and operation principle of the present utility model is as follows:
The control that discharges and recharges of storage battery is composed in parallel by a plurality of isolation type bidirectional DC/DC converters, take the instruction charging and discharging currents as the control target, take actual charging and discharging currents as feedback target, generating regulated quantity by PI control compares with carrier wave, produce pwm signal and deliver to each switch, can realize frequency multiplication control by phase-shifting carrier wave, improve equivalent switching frequency, reduce direct current charging and discharging currents ripple, the direct current sharing control can realize automatic current equalizing by droop control.
The three-phase cascade multilevel inverter is comprised of the cascade of a plurality of H bridge, its control target is to realize the DC side voltage stabilizing, the control of employing dicyclo, interior ring is Voltage loop, outer shroud is electric current loop, outer shroud realizes that by PI control thereby the dc voltage sum is circular current instruction in the command value generation, and current inner loop realizes the parallel network circuit tracking by control.Combining inverter can be realized frequency multiplication control by phase-shifting carrier wave equally, improves equivalent switching frequency, reduces the grid-connected current harmonic wave, and combining inverter need to all be pressed by control realization dc voltage.
By coordinating to control the governing speed realization of DC converter and combining inverter to the Power balance control of whole current transformer.
In the present embodiment, in order to reduce current ripples, promote step-up ratio, described each isolation type bidirectional DC/DC converter is two half-bridge structures, and low-pressure side is connected with an inductance.
In sum, a kind of bidirectional energy-storage current transformer of the utility model adopts DC/DC and DC/AC Two Stages topology, is applicable to the accumulator cell charging and discharging occasion of low-voltage, high-current, and experiment effect is good.
Above embodiment only is explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on the technical scheme basis all falls within the utility model protection range.
Claims (3)
1. bidirectional energy-storage current transformer, it is characterized in that: comprise a three-phase cascade multilevel inverter and several isolation type bidirectionals DC/DC converter, the number of described isolation type bidirectional DC/DC converter is identical with the number of H bridge in the three-phase cascade multilevel inverter, and DC/DC converter and H bridge connect one to one, concrete annexation is: the direct-flow input end of each isolation type bidirectional DC/DC converter all connects storage battery, and dc output end connects the direct-flow input end of the H bridge corresponding with it, the ac output end access electrical network of described three-phase cascade multilevel inverter.
2. a kind of bidirectional energy-storage current transformer as claimed in claim 1, it is characterized in that: described each isolation type bidirectional DC/DC converter is two half-bridge structures, and low-pressure side is connected with an inductance.
3. a kind of bidirectional energy-storage current transformer as claimed in claim 1 is characterized in that: described electrical network employing three-phase three-wire system or three-phase four-wire system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177685 CN203251228U (en) | 2013-04-11 | 2013-04-11 | Bidirectional energy storage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177685 CN203251228U (en) | 2013-04-11 | 2013-04-11 | Bidirectional energy storage converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203251228U true CN203251228U (en) | 2013-10-23 |
Family
ID=49377643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320177685 Expired - Fee Related CN203251228U (en) | 2013-04-11 | 2013-04-11 | Bidirectional energy storage converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203251228U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986308A (en) * | 2014-05-04 | 2014-08-13 | 清华大学 | Dynamic voltage-sharing circuit of direct-current capacitor of multilevel converter |
| CN105762942A (en) * | 2014-12-18 | 2016-07-13 | 神华集团有限责任公司 | Battery electronic module and energy storage system |
| CN107994801A (en) * | 2017-12-08 | 2018-05-04 | 浙江大学 | A kind of cascade connection type single-stage two-way DC-AC converter topologies |
| CN108111036A (en) * | 2018-02-28 | 2018-06-01 | 苏州唯控汽车科技有限公司 | The more level tandem type inversion output equipments of single group battery |
| CN110556833A (en) * | 2019-09-05 | 2019-12-10 | 北京国电光宇机电设备有限公司 | Multi-port microgrid energy router |
| CN111786399A (en) * | 2020-07-22 | 2020-10-16 | 兰州兰石恩力微电网有限公司 | Energy storage inverter system for controlling water system ion battery |
| CN113824143A (en) * | 2021-10-13 | 2021-12-21 | 王勇 | Electric vehicle retired battery secondary utilization system based on H-bridge cascade |
-
2013
- 2013-04-11 CN CN 201320177685 patent/CN203251228U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986308A (en) * | 2014-05-04 | 2014-08-13 | 清华大学 | Dynamic voltage-sharing circuit of direct-current capacitor of multilevel converter |
| CN103986308B (en) * | 2014-05-04 | 2017-04-05 | 清华大学 | A kind of dynamic voltage-balancing of Multilevel Inverters DC capacitor |
| CN105762942A (en) * | 2014-12-18 | 2016-07-13 | 神华集团有限责任公司 | Battery electronic module and energy storage system |
| CN105762942B (en) * | 2014-12-18 | 2019-06-21 | 神华集团有限责任公司 | A kind of battery electron module and energy-storage system |
| CN107994801A (en) * | 2017-12-08 | 2018-05-04 | 浙江大学 | A kind of cascade connection type single-stage two-way DC-AC converter topologies |
| CN108111036A (en) * | 2018-02-28 | 2018-06-01 | 苏州唯控汽车科技有限公司 | The more level tandem type inversion output equipments of single group battery |
| CN110556833A (en) * | 2019-09-05 | 2019-12-10 | 北京国电光宇机电设备有限公司 | Multi-port microgrid energy router |
| CN111786399A (en) * | 2020-07-22 | 2020-10-16 | 兰州兰石恩力微电网有限公司 | Energy storage inverter system for controlling water system ion battery |
| CN113824143A (en) * | 2021-10-13 | 2021-12-21 | 王勇 | Electric vehicle retired battery secondary utilization system based on H-bridge cascade |
| CN113824143B (en) * | 2021-10-13 | 2023-11-10 | 王勇 | Electric vehicle retired battery secondary utilization system based on H bridge cascade connection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203251228U (en) | Bidirectional energy storage converter | |
| CN102377192B (en) | Direct-driving wave power-generating and energy-storing device and control method | |
| She et al. | On integration of solid-state transformer with zonal DC microgrid | |
| CN103647302B (en) | Double-layer coordinating and controlling method of multi-sub microgrid-contained mixed microgrid system | |
| CN206211639U (en) | A kind of composite energy storing device for being applied to electric automobile | |
| CN203800680U (en) | Large power bidirectional deflector capable of supporting access of multiple cell groups | |
| CN103457271A (en) | Chained static synchronous compensator with active power adjusting capacity and cascading unit thereof | |
| CN102882370A (en) | Bidirectional two-input BUCK direct-current converter and power distribution method thereof | |
| CN102916435B (en) | A kind of battery energy storage power conversion system containing Z source network and control method thereof | |
| CN104810857A (en) | Single-phase grid-connected photovoltaic power generation system output power smooth control device and control method | |
| CN104158211A (en) | Multi-power-supply gridconnected system control method based on modularized multilevel convertor | |
| Wang et al. | Research on structure and energy management strategy of household energy router based on hybrid energy storage | |
| Zhao et al. | Bus voltage control strategy for low voltage DC microgrid based on AC power grid and battery | |
| CN103580048A (en) | Chained battery energy storage system integrated with active power filter | |
| CN106410932A (en) | Chained battery energy storage converter suitable for medium-voltage DC power distribution network and control method | |
| Liang et al. | Simulation analysis of grid-connected AC/DC hybrid microgrid | |
| CN108199603B (en) | Multi-winding time-sharing power supply isolation flyback direct current chopper type single-stage multi-input inverter | |
| CN203574386U (en) | Multilevel multiport power generation and energy storage hybrid apparatus | |
| Guo et al. | A virtual inertia control strategy for dual active bridge dc-dc converter | |
| CN108023497B (en) | Series simultaneous power supply forward cycle conversion type single-stage multi-input high-frequency link inverter | |
| CN108111044B (en) | Isolation flyback periodic wave type single-stage multi-input inverter with external parallel time-sharing selection switch | |
| CN108023496B (en) | Series simultaneous selection switch voltage type single-stage multi-input low-frequency link inverter | |
| Thummalagunta et al. | Seamless control for single‐phase high gain quasi‐switched impedance source multilevel inverter for distributed generation application | |
| Wu et al. | A power router based on modular multilevel converter integrating ultracapacitor energy storage system | |
| CN108054946B (en) | Voltage type single-stage multi-input low-frequency link inverter with built-in parallel time-sharing selection switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20131023 Termination date: 20160411 |