CN203574386U - Multilevel multiport power generation and energy storage hybrid apparatus - Google Patents
Multilevel multiport power generation and energy storage hybrid apparatus Download PDFInfo
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- CN203574386U CN203574386U CN201320628178.1U CN201320628178U CN203574386U CN 203574386 U CN203574386 U CN 203574386U CN 201320628178 U CN201320628178 U CN 201320628178U CN 203574386 U CN203574386 U CN 203574386U
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Abstract
The utility model discloses a multilevel multiport power generation and energy storage hybrid apparatus which comprises a first full-bridge converter that is connected with a power generation module, a second full-bridge converter that is connected with an energy storage module, a third full-bridge converter that is connected with a multi-winding transformer, and an H-bridge converter that is connected to a power grid through a filter inductor. The power generation/energy storage hybrid apparatus enables irregular new energy power generated powers to be relatively smooth and limits the power grid current when the power grid voltage drops. A multiport full-bridge isolated DC/DC converter can realize flexible matching of the power generation module of different output voltage grades and the energy storage module, and at the same time makes use of leakage inductor of the transformer and a switching device parasitic capacitor to realize soft switching, and thus realizes relatively high efficiency and electric isolation and saves cost. Since a cascade H-bridge inverter is adopted on the power grid side, multilevel output voltage is obtained, and the electromagnetic compatibility and grid-connected harmonic wave performance are improved.
Description
Technical field
The utility model belongs to electrician, power electronics, generation of electricity by new energy field, relates to a kind of generating and energy storage device based on Cascade H bridge and multiport full-bridge isolated DC to DC converter, is applicable to distributed generation system, new-energy automobile EMS.
Background technology
The energy and environmental problem become increasingly conspicuous, and generation of electricity by new energy technology is developed fast.Yet than traditional generation mode, generation of electricity by new energy has fluctuation, in order to improve the quality of power supply, need to add energy storage device.Photovoltaic generation take below as example, be specifically described.Photovoltaic generation has the advantages such as energy savings, mechanical part are few, is a kind of very promising generation of electricity by new energy technology.Yet photovoltaic electric fails to be convened for lack of a quorum along with intensity of illumination changes, output voltage also can change along with the temperature of photovoltaic module.Due to random weather conditions, there is fluctuation in photovoltaic power, in order to compensate intrinsic photovoltaic power fluctuation, provides the quality of high electric energy, need to use energy storage system, so storage battery can level and smooth irregular photovoltaic power output.When electricity generation system and electrical network disengaging, while forming island mode, photovoltaic/storage battery hybrid power system can provide stable power output.
The electric pressure of photovoltaic, storage battery is lower, generally need to boost through DC to DC converter, could meet the requirement of combining inverter.DC to DC converter is divided into non-isolation type and isolated form, and the required components and parts of non-isolation type direct-current/DC converter are less, and topological structure is simple, and still, it boosts and is limited in scope, and can not realize good electrical isolation.Isolated DC/DC converter has electrical isolation function, the wide ranges of boosting.When integrated a plurality of DC power supply, multiport isolated DC/straight flow structure is compact, power density is high, be easy to realize soft switch, reduce power loss.
Power inverter is the important component part of photovoltaic generating system, but the action of the high-speed switch of device for power switching can produce larger change in voltage, easily produces electromagnetic interference problem.Traditional photovoltaic and storage battery DC to DC converter are all independent, and required DC to DC converter number is many, complex structure.In addition, traditional photovoltaic and storage battery grid-connected inverter adopt independently combining inverter, and grid-connected harmonic wave is larger.
Utility model content
Technical problem: for the deficiencies in the prior art, the utility model proposes a kind of Electro Magnetic Compatibility good, ac output voltage and current harmonics are little, compact conformation, the much higher level multiport of system effectiveness electrification energy storage mixing arrangement.
Technical scheme: a kind of many level multiport electrification energy storage mixing arrangement of the present utility model, is included in a plurality of power generation sub-system unit of AC cascade, the filter inductance that power generation sub-system unit is connected with outside electrical network.Each power generation sub-system unit comprises the first full-bridge converter, the second full-bridge converter, the electricity generation module being connected with the first full-bridge converter DC terminal, the energy-storage module being connected with the second full-bridge converter DC terminal, exchanges with the first full-bridge converter the H bridging parallel operation that end and the second full-bridge converter exchange the multi winding transformer that end is connected, the 3rd full-bridge converter being connected with multi winding transformer, are connected with the DC terminal of the 3rd full-bridge converter simultaneously, and the ac output end of H bridging parallel operation is connected with filter inductance.
In the utility model, above-mentioned the first full-bridge converter, the second full-bridge converter, the 3rd full-bridge converter and multi winding transformer form multiport full-bridge isolated DC to DC converter, realize the energy management of generating/energy storage mixing arrangement.Above-mentioned multiport full-bridge isolated DC to DC converter can adopt phase shifting control or decoupling control policy, and the power between multiport can carry out two-way flow.In the whole course of work, system is carried out MPPT maximum power point tracking to electricity generation module, and the charging and discharging currents of energy-storage module is controlled.When generated output is greater than combining inverter power output, its remaining power will charge for energy-storage module; When generated output is less than combining inverter power output, not enough power is provided by energy-storage module.
In the utility model, electricity generation module can be photovoltaic cell, fuel cell or wind-driven generator.
In the utility model, energy-storage module can be storage battery, super capacitor, flywheel or superconducting magnet.
H bridge inverter in above-mentioned each power generation sub-system unit, carries out cascade at AC, can obtain the output voltage of many level, improves Electro Magnetic Compatibility and harmonic performance.And can reduce the power grade of inverter, and be convenient to modularized design, carry out large-scale production.
Identical single phase system can expand, and forms many level of three-phase multiport electrification energy storage mixing arrangement.
Beneficial effect: the utility model compared with prior art, has the following advantages:
(1) because the inverter of grid side based on the cascade of H bridge carried out cascade by the DC bus-bar voltage of a plurality of power generation sub-system unit, by certain control strategy, can at electrical network outlet side, produce the inverter output voltage of many level, improve the harmonic performance of power network current.
(2), because the inverter of grid side based on the cascade of H bridge carried out cascade by the DC bus-bar voltage of a plurality of power generation sub-system unit, be equivalent to a plurality of DC bus-bar voltage and be added.In the situation that ac output voltage amplitude is constant, each DC bus-bar voltage is reduced.In each power generation sub-system unit, common and different mode voltage reduces, and converter electromagnetic interference reduces.Meanwhile, in each power generation sub-system unit, voltage build-up rate dv/dt reduces.
(3) because existing electricity generation module in system has again energy-storage module, this system has certain fault-tolerant ability, when line voltage falls, the electric energy that electricity generation module sends can effectively be stored in energy-storage module, and the electric energy that is unlikely to send cannot be exported and cause system to occur overvoltage or over-current phenomenon avoidance.
(4) DC to DC converter of multiport, utilizes the parasitic capacitance of transformer leakage inductance and switching device, realizes resonance, thereby realizes zero voltage switch, has reduced loss; System adopts phase shifting control or decoupling zero to control, and conveniently realizes the power division between hybrid energy sources.
(5) between electricity generation module, energy-storage module and electrical network, provide electrical isolation ability; By electricity generation module, energy-storage module DC to DC converter structure assembly together, and there is the soft switching capability of switching device.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model device;
Fig. 2 is the structural representation of power generation sub-system unit in the utility model device;
Fig. 3 is the control strategy principle schematic of multiport full-bridge isolated DC to DC converter in the utility model device;
Fig. 4 is the control strategy principle schematic of the utility model device cascade H bridge combining inverter.
In figure, have: power generation sub-system unit 1, filter inductance 2, electrical network 3, electricity generation module 4, energy-storage module 5, the first full-bridge converter 6, the second full-bridge converter 7, multi winding transformer 8, the 3rd full-bridge converter 9, H bridge inverter 10, multiport full-bridge isolated DC to DC converter 11, phase shift square-wave generator 12, pi controller 13, subtracter 14, low pass filter 15, multiplier 16, pi controller 17, subtracter 18, multiplier 19, voltage controller 20, subtracter 21, divider 22, subtracter 23, current controller 24, subtracter 25, multiplier 26.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, photovoltaic/storage battery hybrid system of take is below specific embodiment, further sets forth the utility model principle.
As shown in attached Fig. 1 and 2, many level multiport electrification energy storage mixing arrangement, is included in a plurality of power generation sub-system unit 1 of AC cascade, the filter inductance 2 that power generation sub-system unit 1 is connected with outside electrical network 3; Each power generation sub-system unit 1 comprises the first full-bridge converter 6, the second full-bridge converter 7, the electricity generation module 4 being connected with the first full-bridge converter 6 DC terminal, the energy-storage module 5 being connected with the second full-bridge converter 7 DC terminal, exchanges with the first full-bridge converter 6 the H bridging parallel operation 10 that end and the second full-bridge converter 7 exchange the multi winding transformer 8 that end is connected, the 3rd full-bridge converter 9 being connected with multi winding transformer 8, are connected with the DC terminal of the 3rd full-bridge converter 9 simultaneously, and the ac output end of H bridging parallel operation 10 is connected with filter inductance 2.Above-mentioned the first full-bridge converter 6, the second full-bridge converter 7, the 3rd full-bridge converter 9 and multi winding transformer 8 form multiport full-bridge isolated DC to DC converter.
Multiport full-bridge isolated DC to DC converter can bi-directional power, and batteries and electrical network can be realized two-way circulating of energy flexibly.The control strategy principle of multiport full-bridge isolated DC to DC converter as shown in Figure 3.Detect the output current of batteries, send into subtracter 14 together with given electric current, obtain error signal, send into pi controller 13, obtain the phase-shift control angle φ between the first full-bridge converter 6 and the second full-bridge converter 7
12.Use low pass filter 15 can obtain the average current I of photovoltaic cell
pVthe voltage and current at photovoltaic cell two ends is through multiplier 16, obtain the power output of photovoltaic cell, itself and given power output are sent into subtracter 18, obtain error signal, pass through again pi controller 17, produce the phase-shift control angle φ between the first full-bridge converter 6 and the 3rd full-bridge converter 9
13.Phase-shift control angle φ
12and φ
13send into phase shift square-wave generator 12, produce pwm signal, this pwm signal is sent into multiport full-bridge isolated DC to DC converter 11, can realize the energy management between multiport.
The control strategy principle of Cascade H bridge as shown in Figure 4.Two power generation sub-system unit 1 in Fig. 1 are designated as respectively to power generation sub-system unit A1 and power generation sub-system unit B 1.In power generation sub-system unit A1, the control mode of corresponding H bridge inverter 10 is: by DC bus-bar voltage reference value
with actual value v
dC1by subtracter 21, subtract each other, the result that it subtracts each other multiplies each other through voltage controller 20.Its result and line voltage standard value v
in_normby multiplier 19, multiply each other, obtain the output reference voltage of H bridge inverter 10
in Fig. 1, in power generation sub-system unit B 1, the control method of corresponding H bridge inverter 10 is: the grid-connected current reference value amplitude that whole system is total
with line voltage standard value v
in_normby multiplier 26, multiply each other, obtain grid-connected current reference value
grid-connected current reference value
i subtracts each other by subtracter 25 with grid-connected current actual value.Its result is passed through current controller 24, the control voltage of corresponding H bridge inverter 10 in power generation sub-system unit B 1 in acquisition Fig. 1.This controls voltage and line voltage v
grid, the output voltage of corresponding H bridge inverter 10 in power generation sub-system unit A1
carry out algebraic operation, DC bus-bar voltage v in its result and power generation sub-system unit B 1
dC2by divider 22, be divided by, obtain the output reference voltage of H bridge inverter 10 corresponding in power generation sub-system unit B 1
Claims (4)
1. the electrification energy storage of level multiport more than kind mixing arrangement, it is characterized in that, this device is included in a plurality of power generation sub-system unit (1) of AC cascade, the filter inductance (2) that described power generation sub-system unit (1) is connected with outside electrical network (3);
Described in each, power generation sub-system unit (1) comprises the first full-bridge converter (6), the second full-bridge converter (7), the electricity generation module (4) being connected with described the first full-bridge converter (6) DC terminal, the energy-storage module (5) being connected with described the second full-bridge converter (7) DC terminal, exchange end with the first full-bridge converter (6) simultaneously and exchange with the second full-bridge converter (7) multi winding transformer (8) that end is connected, the 3rd full-bridge converter (9) being connected with multi winding transformer (8), the H bridging parallel operation (10) being connected with the DC terminal of described the 3rd full-bridge converter (9), the ac output end of described H bridging parallel operation (10) is connected with filter inductance (2).
2. many level multiport electrification energy storage mixing arrangement according to claim 1, it is characterized in that, described the first full-bridge converter (6), the second full-bridge converter (7), multi winding transformer (8) and the 3rd full-bridge converter (9) form multiport full-bridge isolated DC to DC converter, realize the energy management of electrification energy storage mixing arrangement.
3. many level multiport electrification energy storage mixing arrangement according to claim 1, is characterized in that, described electricity generation module is photovoltaic cell, fuel cell or wind-driven generator.
4. many level multiport electrification energy storage mixing arrangement according to claim 1, is characterized in that, described energy-storage module is storage battery, super capacitor, flywheel or superconducting magnet.
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| CN201320628178.1U CN203574386U (en) | 2013-10-12 | 2013-10-12 | Multilevel multiport power generation and energy storage hybrid apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734187A (en) * | 2015-03-12 | 2015-06-24 | 国家电网公司 | Energy storage type intelligent transformer for wind power generation system |
| CN109347211A (en) * | 2018-09-07 | 2019-02-15 | 南京理工大学 | A kind of asymmetry cascade connection multi-level hybrid energy-storing control method |
| US20200076311A1 (en) * | 2017-04-19 | 2020-03-05 | Robert Bosch Gmbh | Isolated dc/dc converter for controlling power flows between three dc terminals |
| CN111510007A (en) * | 2020-04-21 | 2020-08-07 | 中国科学院电工研究所 | Hybrid isolation type single-phase power electronic transformer |
-
2013
- 2013-10-12 CN CN201320628178.1U patent/CN203574386U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734187A (en) * | 2015-03-12 | 2015-06-24 | 国家电网公司 | Energy storage type intelligent transformer for wind power generation system |
| CN104734187B (en) * | 2015-03-12 | 2017-03-22 | 国家电网公司 | Energy storage type intelligent transformer for wind power generation system |
| US20200076311A1 (en) * | 2017-04-19 | 2020-03-05 | Robert Bosch Gmbh | Isolated dc/dc converter for controlling power flows between three dc terminals |
| US10819241B2 (en) * | 2017-04-19 | 2020-10-27 | Robert Bosch Gmbh | Isolated DC/DC converter for controlling power flows between three DC terminals |
| CN109347211A (en) * | 2018-09-07 | 2019-02-15 | 南京理工大学 | A kind of asymmetry cascade connection multi-level hybrid energy-storing control method |
| CN109347211B (en) * | 2018-09-07 | 2022-03-22 | 南京理工大学 | Asymmetric cascade multilevel hybrid energy storage control method |
| CN111510007A (en) * | 2020-04-21 | 2020-08-07 | 中国科学院电工研究所 | Hybrid isolation type single-phase power electronic transformer |
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| 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: 20140430 Termination date: 20161012 |