CN106877651A - A kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system - Google Patents
A kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system Download PDFInfo
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- CN106877651A CN106877651A CN201510914946.3A CN201510914946A CN106877651A CN 106877651 A CN106877651 A CN 106877651A CN 201510914946 A CN201510914946 A CN 201510914946A CN 106877651 A CN106877651 A CN 106877651A
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Abstract
The invention discloses a kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system, including the control of MMC energy-storage systems, single electric current ring, grading ring control, four parts of energy hole.System realizes electric current and electric voltage equalization uneoupled control, and proposes modular double closed-loop decoupling control strategy based on independent direct current net voltage control targe, it is proposed that the energy-storage system management strategy based on voltage on line side and super capacitor SOC.The system can help to reduce that super capacitor monomer voltage is low and contradiction between application scenario voltage is high.The ripple frequency of inductive current is improve N times by the energy-storage system based on MMC while voltage, the current stress of switching device is reduced, and the volume and weight to reducing inductance has greatly help.
Description
Technical field
The present invention relates to a kind of bidirectional DC/DC converter, more particularly to a kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system.
Background technology
Ultracapacitor is a kind of important energy-storage travelling wave tube, with power density it is big, efficiency for charge-discharge is high, have extended cycle life the features such as, absorb the occasions such as system in micro-grid system, generation of electricity by new energy, braking energy and have a wide range of applications.
In high pressure, the super capacitor energy-storage application scenario of Large Copacity, because storage capacitor monomer (or the monomer series-connected component of electric capacity) voltage is relatively low, it usually needs by multiple monomers or component system in series.And super capacitor monolithic element parameter discrete is larger, need to consider electric voltage equalization problem by multiple monomer series-connected systems.Due to limiting in a balanced way, energy-storage system is difficult to be connected using a large amount of monomers or component.Thus for the occasion of high voltage, conventional method has the power conversion of energy-storage system, such as the energy-storage system power conversion scheme of super capacitor energy-storage block coupled in series, but the system still needs to additional equalization circuits and carries out voltage balance control to super capacitor group；Using H bridges cascade converter as the energy storage conversion scheme for being applied to AC network, this scheme reduces the voltage class of each energy-storage module (being battery in this article)；MMC-BDC energy storage the topology voltage of switching device, current stress under the conditions of same power grade is small, the features such as inductance required under the conditions of identical output current ripple is only 1/N2 (N is cascade module number) of single half-bridge topology, there is advantage in high pressure, great power bidirectional transformation of electrical energy occasion.
The content of the invention
For the contradiction for overcoming super capacitor monomer voltage low and between application scenario voltage is high, the present invention proposes a kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system.
The technical solution adopted for the present invention to solve the technical problems is：
Using the relation of Pressure and Control between the small-signal model analysis super capacitor energy-storage system power control of reversible transducer and super capacitor group, the double-loop control strategy of many level bidirectional DC-DC converters of multimode is designed, the uneoupled control of electric voltage equalization between realizing super capacitor group while stability contorting net side inductive current.Further, energy-storage system energy control strategy is proposed according to busbar voltage change and super capacitor charge level (state of charge, SOC).
MMC bidirectional DC/DC converters for super capacitor energy-storage system include：MMC energy-storage systems, the control of single electric current ring, grading ring control, four parts of energy hole.
The MMC energy-storage systems are to be sequentially connected in series the lower half bridge arm of N number of half-bridge topology to be connected to direct current net side, and bridge arm two ends connect ultracapacitor group by LC wave filters.
The single electric current ring control is that the electric current that sampling is obtained is carried out into PI controls, makes the given electric current of its tracking.
The grading ring controls to be designed by object of single module system, and adoption rate P adjusts and eliminates voltage static difference.
The energy hole is control targe to stablize the voltage of grid side, using 4 voltage-regulation rings, the flow direction by determining energy at different conditions after superposition.
The beneficial effects of the invention are as follows：System realizes electric current and electric voltage equalization uneoupled control, and proposes modular double closed-loop decoupling control strategy based on independent direct current net voltage control targe, it is proposed that the energy-storage system management strategy based on voltage on line side and super capacitor SOC.The system can help to reduce that super capacitor monomer voltage is low and contradiction between application scenario voltage is high.The ripple frequency of inductive current is improve N times by the energy-storage system based on MMC while voltage, the current stress of switching device is reduced, and the volume and weight to reducing inductance has greatly help.
Brief description of the drawings
Fig. 1 is based on the energy-storage system circuit theory diagrams of MMC-BDC.
Fig. 2 single electric current ring Controlling models.
Fig. 3 grading ring Controlling models.
Fig. 4 energy-storage system energy control strategy block diagrams.
Specific embodiment
In Fig. 1, be sequentially connected in series up for the lower half bridge arm of N half-bridge topology and be connected to direct current net side by it, and bridge arm two ends connect ultracapacitor group (i=1,2 ..., N) by LC wave filters.It is negligible during theory analysis because filter inductance is smaller.Switching device both end voltage in topology is determined that the voltage max of block coupled in series port is determined by the super capacitor terminal voltage of the module by ultracapacitor group terminal voltage.When super capacitor group is in de-energized state, bidirectional DC-DC converter is operated in decompression mode, the upper bridge arm switching tube of half-bridge module, lower bridge arm diode and inductance L composition Buck converters, the energy transfer of super capacitor group to dc bus side.During switching tube turn-on and turn-off, circuit works in both modalities which respectively.When super capacitor group is in energy storage state, bi-directional DC-DC converter is operated in boost mode, the lower bridge arm switching tube of half-bridge module, upper bridge arm diode and inductance composition Boost converters, dc bus side energy transfer to super capacitor.
MMC-BDC is that a kind of one end is connected the transformation system of one end independence, the flowing of the current control energy-storage system energy by controlling filter inductance L.Realize the reliable and stable operation of the system, convertor controls aspect is needed comprising two controlling units, one is the current closed-loop for controlling inductive current, and another is the grading ring for realizing module balanced operation, and the two closed loops are realized by the dutycycle of adjustment module.
In Fig. 2：GI is electric current loop adjuster transmission function；It is the gain of dutycycle to output voltage；It is the transmission function of mains side inductive drop to inductive current；It is current sample coefficient.
Grading ring can be designed by object of single module system.In Fig. 3：It is Voltage loop adjuster transmission function；It is super capacitor charge/discharge current to the transmission function of super capacitor terminal voltage；It is super-capacitor voltage downsampling factor.
In Fig. 4, system uses 4 voltage-regulation rings：GPI1_BUS is bus voltage upper limit voltage regulator；GPI2_BUS is busbar voltage lower voltage limit adjuster；GPI3_SC is super-capacitor voltage upper voltage limit adjuster；GPI4_SC is super-capacitor voltage lower voltage limit adjuster.There is corresponding amplitude limit link after each relief frame, by determining that (current direction is for just, converter is in Buck mode of operations to the flow direction of energy at different conditions when definition system releases energy after superposition；Current direction is negative during system stored energy, and converter is in Boost mode of operations).
Claims (5)
1. a kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system, it is characterised in that：Including MMC energy-storage systems, the control of single electric current ring, grading ring control, four parts of energy hole.
2. the MMC bidirectional DC/DC converters of super capacitor energy-storage system are used for as claimed in claim 1, it is characterized in that be sequentially connected in series up for the lower half bridge arm of N number of half-bridge topology by the MMC energy-storage systems is connected to direct current net side, bridge arm two ends connect ultracapacitor group by LC wave filters.
3. the MMC bidirectional DC/DC converters of super capacitor energy-storage system are used for as claimed in claim 1, it is characterised in that the single electric current ring control realizes the DAZ gene of electric current using PI controls.
4. it is used for the MMC bidirectional DC/DC converters of super capacitor energy-storage system as claimed in claim 1, it is characterised in that the grading ring control adoption rate P controls, realizes the average of voltage.
5. the MMC bidirectional DC/DC converters of super capacitor energy-storage system are used for as claimed in claim 1, it is characterised in that the energy hole 4 voltage-regulation rings, the flow direction by determining energy at different conditions after superposition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510914946.3A CN106877651A (en) | 2015-12-13 | 2015-12-13 | A kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system |
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| CN201510914946.3A CN106877651A (en) | 2015-12-13 | 2015-12-13 | A kind of MMC bidirectional DC/DC converters for super capacitor energy-storage system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667058A (en) * | 2018-07-24 | 2018-10-16 | 合肥工业大学 | A kind of system for chain type energy storage structure that can eliminate secondary pulsation |
| CN109638923A (en) * | 2019-01-17 | 2019-04-16 | 哈尔滨工业大学 | Mixed mode battery equalizing circuit |
| CN113141039A (en) * | 2020-05-07 | 2021-07-20 | 长沙天仪空间科技研究院有限公司 | Energy storage system |
| CN115189594A (en) * | 2022-06-21 | 2022-10-14 | 湖北文理学院 | Motor soft start control system and device |
| CN116015072A (en) * | 2023-03-28 | 2023-04-25 | 浙江大学杭州国际科创中心 | Control method of wide-range converter |
-
2015
- 2015-12-13 CN CN201510914946.3A patent/CN106877651A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667058A (en) * | 2018-07-24 | 2018-10-16 | 合肥工业大学 | A kind of system for chain type energy storage structure that can eliminate secondary pulsation |
| CN109638923A (en) * | 2019-01-17 | 2019-04-16 | 哈尔滨工业大学 | Mixed mode battery equalizing circuit |
| CN113141039A (en) * | 2020-05-07 | 2021-07-20 | 长沙天仪空间科技研究院有限公司 | Energy storage system |
| CN113141039B (en) * | 2020-05-07 | 2024-03-22 | 长沙天仪空间科技研究院有限公司 | Energy storage system |
| CN115189594A (en) * | 2022-06-21 | 2022-10-14 | 湖北文理学院 | Motor soft start control system and device |
| CN115189594B (en) * | 2022-06-21 | 2023-06-09 | 湖北文理学院 | Motor soft start control system and device |
| CN116015072A (en) * | 2023-03-28 | 2023-04-25 | 浙江大学杭州国际科创中心 | Control method of wide-range converter |
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Application publication date: 20170620 |