CN106712062A - Modular multilevel converter-based composite energy storage system with high discharge depth - Google Patents
Modular multilevel converter-based composite energy storage system with high discharge depth Download PDFInfo
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- CN106712062A CN106712062A CN201710042771.0A CN201710042771A CN106712062A CN 106712062 A CN106712062 A CN 106712062A CN 201710042771 A CN201710042771 A CN 201710042771A CN 106712062 A CN106712062 A CN 106712062A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
Abstract
The invention discloses a modular multilevel converter-based composite energy storage system with a high discharge depth. An energy-type energy storage element and a power-type energy storage element are connected to a DC side and a sub-module of a modular multilevel converter respectively to form the composite energy storage system; and the composite energy storage system is connected to a three-phase power supply through a grid-connection reactor, wherein the energy-type energy storage element is connected through internal series-parallel connection, and then connected with a DC end of the modular multilevel converter through a DC/DC converter; the power-type energy storage element is connected with a half-bridge DC/DC circuit through an inductor; and the half-bridge DC/DC circuit is connected with an electrolytic capacitor of the modular multilevel converter in parallel. According to the composite energy storage system, the output (or absorption) power of the energy-type energy storage element and the power-type energy storage element can be independently adjusted according to the requirement change of the power energy, the discharge depths of the energy-type energy storage element and the power-type energy storage element are fully ensured and the utilization rate of the energy storage elements is improved.
Description
Technical field
The invention belongs to energy-storage system technical field, and in particular to a kind of electric discharge high based on modular multi-level converter
The compound energy-storage system of depth.
Background technology
It is to solve renewable energy power generation fluctuation, improve digestion capability and raising of the power network to new energy to build energy storage device
One important channel of energy use efficiency.The power energy storage technology of current scale is mainly drawn water energy storage, compressed air storage
Energy, flywheel energy storage, superconducting energy storage, battery energy storage, ultracapacitor energy storage etc..Wherein battery energy storage is the typical case of energy type energy storage
Represent, battery energy storage is that most have one of investment/cost-benefit energy storage technology at present, with modularization, response is fast, be commercialized journey
The characteristics of spending high.However, battery energy storage has the shortcomings that cycle life is short, power density is low, be not suitable for high-power in short-term
With the occasion of frequent discharge and recharge, therefore, occurring in that a kind of composite energy storage system for having energy type energy storage and power-type energy-storage travelling wave tube concurrently
System, so as to optimize the life-span of energy-storage battery simultaneously but also with the ability of high-power, frequent discharge and recharge.Especially, go out in recent years
Showed it is a kind of based on modular multi-level converter (MMC) compound energy-storage system (Zhang Jianzhong, Hu Sheng, Wang Wei, Sun Yaodong,
A kind of compound energy-storage system based on modular multi-level converter, Chinese invention patent, 2016, application number：
201611204892.2), energy type energy-storage travelling wave tube and power-type energy-storage travelling wave tube are connected on modular multi-level converter by it respectively
DC side and internal element module in, constitute distributed power-type energy storage pattern, simplify power-type energy-storage travelling wave tube
Connection and voltage balance control, reduce energy-storage system complexity and cost.But it is this based on modular multi-level converter
Compound energy-storage system there is a problem of that power-type energy-storage travelling wave tube depth of discharge is low, i.e., when power-type energy-storage travelling wave tube, (typical case adopts
With ultracapacitor) electric discharge when, substantially once quadratic relationship declined its terminal voltage, and module can be caused after reaching certain depth of discharge
Change Multilevel Inverters because DC voltage is too low, so as to cannot continue to provide electric energy by the lateral AC of direct current, cause power-type
Energy-storage travelling wave tube depth of discharge is relatively low, and the capacity of energy-storage travelling wave tube fails to be fully used.It can be seen that, in addition it is also necessary to the compound energy storage
System carries out innovation so as to further improve its combination property.
The content of the invention
The purpose of the present invention is directed to the problem of prior art presence, there is provided a kind of based on modular multi-level converter
The compound energy-storage system of depth of discharge high.
The technical scheme is that：A kind of compound energy storage system of depth of discharge high based on modular multi-level converter
System, including energy type energy-storage travelling wave tube, DC/DC converters, MMC (modular multi-level converter) submodule, reactor, power supply,
Buffer inductance；
Described MMC submodules include power-type energy-storage travelling wave tube, energy storage inductor, half-bridge DC/DC circuits, electrolytic capacitor and
MMC half-bridge submodules；
The MMC submodules have been internally integrated power-type energy-storage travelling wave tube, typically by several ultracapacitor series connection groups
Conjunction is formed, and forms the mode of distributed energy storage；Power-type energy-storage travelling wave tube is connected by energy storage inductor with half-bridge DC/DC circuits, institute
The half-bridge DC/DC circuit output ends stated are connected to the two ends of electrolytic capacitor, and electrolytic capacitor is in parallel with MMC half-bridge submodules even
Connect, the input pin i and output pin o of MMC half-bridge submodules are input and the output pin of MMC submodules, successively by each bridge arm
On MMC submodules output pin be connected with the input pin of next MMC submodules, and by MMC of bridge arm on three-phase first
The direct current positive bus of module input pin connection composition MMC, last MMC submodules output pin of bridge arm connection composition under three-phase
The direct current negative busbar of MMC, by first MMC submodule of the output of last MMC submodule of bridge arm in every phase and lower bridge arm
Input is connected with buffer inductance, is connected with reactor after the buffer inductance of upper and lower bridge arm is connected with each other and by it, reactor
Output end is connected with the power supply outside compound energy-storage system；
The energy type energy-storage travelling wave tube is typically concatenated by battery, first go here and there after and or first and afterwards string is combined, and
It is aided with active cell balancing energy system or passive energy content of battery equalizing system, energy type energy-storage travelling wave tube is converted by DC/DC
Device is connected with the dc bus of MMC.
Using between two kinds of energy-storage travelling wave tubes of DC/DC converters and half-bridge DC/DC circuit realirations in the present invention, and energy storage
Control between element and modular multi-level converter is separate, be independent of each other, and improves the depth of discharge of energy-storage travelling wave tube.
Preferably, the half-bridge DC/DC circuits have two kinds of mode of operations, when power-type energy-storage travelling wave tube needs electric discharge,
Half-bridge DC/DC circuits work in Boost boost modes, when power-type energy-storage travelling wave tube needs to charge, the work of half-bridge DC/DC circuits
In Buck decompression modes.
Preferably, typically with battery as energy type energy-storage travelling wave tube when, in storage energy or release energy
During, the change of battery terminal voltage can be caused, so the control mode of the DC/DC converters of battery connection is outer voltage electricity
Stream inner ring control, during so ensure that modular multi-level converter in battery storage or releasing energy, its end
Voltage keeps constant.During typically with ultracapacitor as power-type energy-storage travelling wave tube, the half-bridge being connected with ultracapacitor
DC/DC circuits are also adopted by the control mode of outer voltage current inner loop, and outer voltage is used to control the electrochemical capacitor of MMC submodules
Device average voltage keeps constant, and current inner loop is used for the energy of storage or the release for controlling ultracapacitor.
The half-bridge DC/DC circuits being connected with power-type energy-storage travelling wave tube can be according to the capacity volume variance of each power-type energy-storage travelling wave tube
Regulation dutycycle, so as to realize the energy balance between each power-type energy-storage travelling wave tube.This capacity volume variance include bridge arm inside between,
Between upper and lower bridge arm and alternate each submodule capacity volume variance.
The dutycycle of the ultracapacitor interface circuit in each submodule is not only controlled by outer voltage current inner loop
System, and controlled by the capacity volume variance of super capacitor in different submodules.Specifically when the super capacitor in a certain submodule
When other submodules of the energy ratio of device are high, when energy-storage system releases energy more release energy, in energy-storage system energy absorption
Few energy absorption；When the energy ratio of the ultracapacitor in a certain submodule other submodules are low, energy is discharged in energy-storage system
Released energy less during amount, many energy absorptions in energy-storage system energy absorption.So, ultracapacitor storage in each submodule
Energy reaches unanimity, it is achieved thereby that realizing the function of energy management using interface circuit and modular multi-level converter.
It is integrated with other control modes and general modularization of the modular multi-level converter of ultracapacitor energy storage
The control mode of Multilevel Inverters is identical, for example loop current suppression strategy, and electrochemical capacitor balance of voltage strategy can directly make
With.
Beneficial effect：The present invention constitutes energy type energy-storage system using the DC side of modular multi-level converter, utilizes
The DC side of the inside submodule of modular multi-level converter constitutes distributed power-type energy-storage system, realizes same
Compound energy-storage system is built in individual current transformer, system architecture is simple, cost is relatively low, and energy type energy-storage system and power-type
Energy-storage system is mutually isolated by power inverter, is independent of each other.When power-type energy-storage travelling wave tube depth of discharge is deepened, voltage reduction
When, can be controlled by the half-bridge DC/DC circuit realirations voltage for connecting, keep MMC submodule electrolytic capacitor average voltages
Keep constant, so as to ensure that MMC can continue to normal work, improve the depth of discharge of power-type energy-storage travelling wave tube.
Brief description of the drawings
Fig. 1 is system schematic of the invention.
Fig. 2 is sub-modular structure schematic diagram of the invention.
Fig. 3 is power distribution block diagram of the invention.
In accompanying drawing：Energy type energy-storage travelling wave tube 1, DC/DC converters 2, MMC submodules 3, reactor 4, power supply 5, buffer inductance
6th, power-type energy-storage travelling wave tube 7, energy storage inductor 8, half-bridge DC/DC circuits 9, electrolytic capacitor 10, MMC half-bridges submodule 11.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings：
A kind of compound energy-storage system of depth of discharge high based on modular multi-level converter, including energy type energy storage unit
Part 1, DC/DC converters 2, MMC submodules 3, reactor 4, power supply 5, buffer inductance 6.Described MMC submodules 3 include power
Type energy-storage travelling wave tube 7, energy storage inductor 8, half-bridge DC/DC circuits 9, electrolytic capacitor 10 and MMC half-bridges submodule 11.
The MMC submodules 3 have been internally integrated power-type energy-storage travelling wave tube 7, typically can be by several ultracapacitor strings
Connection is combined, and forms the mode of distributed energy storage.Power-type energy-storage travelling wave tube 7 is by energy storage inductor 8 and half-bridge DC/DC circuits 9
Connection, described half-bridge DC/DC circuit output ends are connected to the two ends of electrolytic capacitor 10, electrolytic capacitor 10 and MMC half-bridges
Submodule 11 is connected in parallel, and the input pin i and output pin o of MMC half-bridges submodule 11 are the input and output of MMC submodules 3
, with the input pin of next MMC submodules be connected the MMC submodules output pin on each bridge arm successively by pin, and by three-phase
The direct current positive bus of the MMC submodules input pin connection composition MMC of bridge arm first, last MMC submodule of bridge arm under three-phase
The direct current negative busbar of block output pin connection composition MMC, by the output of last MMC submodule of bridge arm in every phase and lower bridge arm the
One input of MMC submodules is connected with buffer inductance 6, after the buffer inductance 6 of upper and lower bridge arm is connected with each other and by itself and electricity
Anti- device 4 is connected, and the output end of reactor 4 is connected with the power supply outside compound energy-storage system；
The energy type energy-storage travelling wave tube 1 is typically concatenated by battery, first go here and there after and or first and afterwards string is combined, and
It is aided with active cell balancing energy system or passive energy content of battery equalizing system, energy type energy-storage travelling wave tube 1 is converted by DC/DC
Device 2 is connected with the dc bus of MMC.
The half-bridge DC/DC circuits 9 have two kinds of mode of operations, when power-type energy-storage travelling wave tube needs electric discharge, half-bridge DC/DC
Circuit 9 works in Boost boost modes, and when power-type energy-storage travelling wave tube needs to charge, half-bridge DC/DC circuits 9 work in Buck
Decompression mode.
The control mode of the DC/DC converters 2 is controlled using outer voltage current inner loop, is made using outer voltage control
The DC voltage for obtaining MMC keeps constant, the power of the output (absorption) of current inner loop control battery energy storage system.
Fig. 2 show MMC submodules, by 4 switching devices with anti-paralleled diode, 1 electrochemical capacitor, 1 energy storage
Inductance and power-type energy-storage travelling wave tube are constituted.Switching device S1, S2 and electrochemical capacitor C1 constitute the half of modular multi-level converter
Bridge sub-modular structure, switching device S3, S4 and energy storage inductor L1 constitute the ultracapacitor DC/DC circuits based on half-bridge, this
Half-bridge DC/DC circuits can work and Buck or Boost patterns, correspond respectively to ultracapacitor charging and discharging state.This
Interface circuit is also adopted by the control mode of outer voltage current inner loop, and outer voltage is used to control the average voltage of electrolytic capacitor
Constant, current inner loop is used for the watt level for controlling super capacitor to export (absorption).It is worth noting that：In each submodule
The dutycycle of ultracapacitor interface circuit is not only controlled by outer voltage current inner loop, and by different submodules
The control of the capacity volume variance of ultracapacitor.Specifically when the energy ratio of the ultracapacitor in a certain submodule, other submodules are high
When, when energy-storage system releases energy more release energy, few energy absorption in energy-storage system energy absorption；When a certain submodule
In the energy ratio of ultracapacitor other submodules it is low when, released energy less when energy-storage system releases energy, in energy storage system
Many energy absorptions during system energy absorption.So, the energy of ultracapacitor storage reaches unanimity in each submodule, it is achieved thereby that
The function of energy management is realized using interface circuit and modular multi-level converter.Super capacitor energy difference herein
Refer not only to the super capacitor energy difference in a bridge arm, also including the super capacitor energy difference between upper and lower bridge arm and
Alternate super capacitor energy difference.
Fig. 3 is the energy hole flow chart of compound energy-storage system.When calculating battery energy storage system and super electricity respectively
After the power of container energy-storage system output (absorption), the DC/DC converters of control module Multilevel Inverters DC side, output
(absorption) desired energy type energy-storage system power Pn；For desired output (absorption) power P of power-type energy-storage systemg, first pass through
Power reallocation link (submodule sum is 6N) is gone through, namely in the case where keeping total output (absorption) power constant, regulation
Output (absorption) power of each submodule, so that the energy of the ultracapacitor in each submodule reaches unanimity, Ran Hougen
According to the interface circuit of the desired output of ultracapacitor (absorption) Power Control ultracapacitor in each submodule, it is ensured that total
Output (absorption) power is desired output (absorption) power.Finally, the compound energy storage based on modular multi-level converter
The total power of system output (absorption), through grid-connected reactor 4, accesses power supply 5.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of compound energy-storage system of depth of discharge high based on modular multi-level converter, it is characterised in that：Including energy
Amount type energy-storage travelling wave tube, DC/DC converters, MMC submodules, reactor, power supply, buffer inductance；
Described MMC submodules include power-type energy-storage travelling wave tube, energy storage inductor, half-bridge DC/DC circuits, electrolytic capacitor and MMC
Half-bridge submodule；
The MMC submodules have been internally integrated power-type energy-storage travelling wave tube, typically by several ultracapacitor tandem compounds
Into the mode of formation distributed energy storage；Power-type energy-storage travelling wave tube is connected by energy storage inductor with half-bridge DC/DC circuits, described
Half-bridge DC/DC circuit output ends are connected to the two ends of electrolytic capacitor, and electrolytic capacitor is connected in parallel with MMC half-bridge submodules,
The input pin i and output pin o of MMC half-bridge submodules are input and the output pin of MMC submodules, successively by each bridge arm
MMC submodules output pin is connected with the input pin of next MMC submodules, and by the MMC submodules of bridge arm on three-phase first
The direct current positive bus of input pin connection composition MMC, last MMC submodules output pin of bridge arm connection composition MMC under three-phase
Direct current negative busbar, by first input of MMC submodules of the output of last MMC submodule of bridge arm in every phase and lower bridge arm with
Buffer inductance is connected, and is connected with reactor after the buffer inductance of upper and lower bridge arm is connected with each other and by it, the output end of reactor
It is connected with the power supply outside compound energy-storage system；
The energy type energy-storage travelling wave tube is typically concatenated by battery, first go here and there after and or first and afterwards string is combined, and be aided with
Active cell balancing energy system or passive energy content of battery equalizing system, energy type energy-storage travelling wave tube by DC/DC converters with
The dc bus connection of MMC.
2. the compound energy storage system of a kind of depth of discharge high based on modular multi-level converter according to claim 1
System, it is characterised in that：The half-bridge DC/DC circuits have two kinds of mode of operations, when power-type energy-storage travelling wave tube needs electric discharge, half-bridge
DC/DC circuits work in Boost boost modes, and when power-type energy-storage travelling wave tube needs to charge, half-bridge DC/DC circuits are worked in
Buck decompression modes.
3. the compound energy storage system of a kind of depth of discharge high based on modular multi-level converter according to claim 1
System, it is characterised in that：The control mode of the DC/DC converters is controlled using outer voltage current inner loop, using outer voltage
Control causes that the DC voltage of MMC keeps constant, the power of output or the absorption of current inner loop control battery energy storage system.
4. the compound energy storage system of a kind of depth of discharge high based on modular multi-level converter according to claim 1
System, it is characterised in that：Energy difference of the half-bridge DC/DC circuits being connected with power-type energy-storage travelling wave tube according to each power-type energy-storage travelling wave tube
Different regulation dutycycle, so as to realize the energy balance between each power-type energy-storage travelling wave tube, this capacity volume variance includes bridge arm inside
Between, between upper and lower bridge arm and alternate each submodule capacity volume variance.
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| CN108306324A (en) * | 2018-01-11 | 2018-07-20 | 北京交通大学 | Modularization centralized formula energy-storage system |
| CN108306318A (en) * | 2018-01-11 | 2018-07-20 | 北京交通大学 | Symmetrical energy-storage system based on Modular multilevel converter |
| CN108599603A (en) * | 2018-04-10 | 2018-09-28 | 西北工业大学 | A kind of Modular multilevel converter and its capacitance voltage Ripple Suppression method |
| CN109193722A (en) * | 2018-10-08 | 2019-01-11 | 浙江大学 | In conjunction with the hybrid middle pressure AC network energy storage device of battery and super capacitor |
| WO2019165750A1 (en) * | 2018-02-28 | 2019-09-06 | 北京天诚同创电气有限公司 | Protection apparatus, protection control method and modularized multi-level converter |
| CN110690723A (en) * | 2019-10-31 | 2020-01-14 | 上海交通大学 | Control method of energy storage type modular multilevel converter in offshore wind power system |
| CN110718929A (en) * | 2019-09-02 | 2020-01-21 | 中国科学院电工研究所 | Current conversion module, energy storage power station structure, energy storage power station system and fault processing method |
| CN111244995A (en) * | 2020-03-12 | 2020-06-05 | 荣信汇科电气技术有限责任公司 | Three-phase multi-level high-voltage energy storage device and control method thereof |
| CN113994584A (en) * | 2018-01-25 | 2022-01-28 | B·S·里亚尔 | Multi-level modular converter |
| CN114142753A (en) * | 2021-11-26 | 2022-03-04 | 国网湖北省电力有限公司电力科学研究院 | MMC type energy router submodule capacitor voltage ripple suppression method |
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| CN109193722A (en) * | 2018-10-08 | 2019-01-11 | 浙江大学 | In conjunction with the hybrid middle pressure AC network energy storage device of battery and super capacitor |
| CN110718929A (en) * | 2019-09-02 | 2020-01-21 | 中国科学院电工研究所 | Current conversion module, energy storage power station structure, energy storage power station system and fault processing method |
| CN110690723A (en) * | 2019-10-31 | 2020-01-14 | 上海交通大学 | Control method of energy storage type modular multilevel converter in offshore wind power system |
| CN110690723B (en) * | 2019-10-31 | 2021-03-19 | 上海交通大学 | Control method of energy storage type modular multilevel converter in offshore wind power system |
| CN111244995A (en) * | 2020-03-12 | 2020-06-05 | 荣信汇科电气技术有限责任公司 | Three-phase multi-level high-voltage energy storage device and control method thereof |
| CN114142753A (en) * | 2021-11-26 | 2022-03-04 | 国网湖北省电力有限公司电力科学研究院 | MMC type energy router submodule capacitor voltage ripple suppression method |
| CN114142753B (en) * | 2021-11-26 | 2023-06-23 | 国网湖北省电力有限公司电力科学研究院 | MMC type energy router submodule capacitor voltage ripple suppression method |
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Application publication date: 20170524 |