CN109390927A - It is a kind of based on SOC without interconnected communication distributed energy storage droop control method - Google Patents
It is a kind of based on SOC without interconnected communication distributed energy storage droop control method Download PDFInfo
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- CN109390927A CN109390927A CN201910004478.4A CN201910004478A CN109390927A CN 109390927 A CN109390927 A CN 109390927A CN 201910004478 A CN201910004478 A CN 201910004478A CN 109390927 A CN109390927 A CN 109390927A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
Abstract
It is a kind of based on SOC without interconnected communication distributed energy storage droop control method, construct the DC micro power grid system of two distributed energy storage wired in parallel；Obtain energy-storage module state-of-charge SOC；Obtain each sagging coefficient of distributed energy storage module charge and discharge；The droop control method without interconnected communication based on SOC, it is poor that the product of DC bus reference voltage and sagging coefficient and energy-storage module output power is made, and obtains energy-storage module output end reference voltage；Energy-storage module output end reference voltage and output end virtual voltage are obtained into voltage error value as difference, current signal reference value is used as after pi regulator exports, then obtain error current value as difference with actual current, and be input to pi regulator and obtain modulated signal；Modulated signal is generated into pwm pulse wave by PWM modulation, the conducting and shutdown of two-way DC/DC converter switches pipe is controlled, realizes the charge and discharge process of distributed energy storage module.The present invention improves the reliability of system, realizes that bearing power divides equally the SOC balance with each distributed energy storage module.
Description
Technical field
The present invention relates to distributed energy storage system control method, especially a kind of distributed energy storage system power controlling party
Method.
Background technique
With increasingly prominent, renewable energy distributed power generation and the micro-capacitance sensor technology of energy shortage and problem of environmental pollution
Extensive concern by domestic and foreign scholars.Since direct-current grid is reducing the sides such as energy conversion times, raising power quality
Face shows big advantage, therefore has obtained people and more and more paid attention to.Energy-storage units are in direct-current grid must not
The a part that can lack, because renewable energy power generation has the shortcomings that intermittent, fluctuation, and energy-storage units can be according to distribution
Power supply output is unstable and load variations change the method for operation and electric energy is exported or absorbed to system, solves system power balance and asks
Topic enhances system stability.Separate unit energy storage is generally difficult to meet the requirement of systems mass, therefore can adopt multiple energy-storage units
With the reasonable distribution for realizing bearing power in the distributed access DC micro power grid system of modular technology.Distributed energy storage system
Power distribution control method mainly has master & slave control, Average Current Control, sagging control etc..Nothing between parallel module in sagging control
High frequency communications line transmission of control signals being needed, system reliability is high, it is easy to accomplish System Expansion meets the requirement of distributed power generation,
Therefore droop control method is mostly used in the distribution of distributed energy storage system power.
It is fixed for the sagging coefficient in the sagging control of tradition, each energy-storage module output power ratio is constant, and is realizing
The problem of DC bus-bar voltage falls inevitably is introduced in the process, and many scholars change the sagging control of tradition
Into, so that each energy-storage module is dynamically adapted output power, realize the reasonable distribution of system power, while compensate for it is sagging control draw
The DC bus risen falls, but is mostly the transmission that control signal is carried out using low bandwidth communication.For example, in document [1] " State-
of-Charge Balance UsingAdaptive Droop Control for Distributed Energy Storage
Systems in DC Microgrid " although described in adaptive SOC it is sagging control realize each energy-storage module according to SOC
Dynamic adjustment output power, but to fall value bigger than normal for the DC bus-bar voltage that causes of the method, it is especially lesser in energy-storage module SOC
DC bus-bar voltage be will lead in discharge process beyond allowed band, influence the stability of micro-capacitance sensor operation, it is therefore desirable to low strap
Width communication compensates busbar voltage, increases the complexity of system, reduces the reliability of system.
Summary of the invention
It is an object of that present invention to provide a kind of simplified system complexity, raising system reliability, realize that bearing power is divided equally
With each distributed energy storage module SOC balance based on SOC without interconnected communication distributed energy storage droop control method.
To achieve the above object, use following technical scheme: steps are as follows for the method for the invention:
Step 1, the DC micro power grid system of two distributed energy storage wired in parallel is constructed；
Step 2, the state-of-charge SOC at each energy-storage module current time is obtained；
Step 3, the sagging coefficient of charge and discharge of each distributed energy storage module is obtained according to the functional relation being newly fitted；
Step 4, the droop control method without interconnected communication based on SOC, by DC bus reference voltage and sagging coefficient
It is poor to make with the product of energy-storage module output power, obtains energy-storage module output end reference voltage；
Step 5, energy-storage module output end reference voltage and output end virtual voltage are obtained into voltage error value as difference, through PI
It is used as current signal reference value after adjuster output, then obtains error current value as difference with actual current, and is input to PI adjusting
Device obtains modulated signal；
Step 6, modulated signal is generated into pwm pulse wave by PWM modulation, to control two-way DC/DC converter switches
The charge and discharge process of distributed energy storage module is realized in the conducting and shutdown of pipe.
Further, in step 3, the functional relation being newly fitted are as follows:
Discharge process:
Wherein, when SOC → 1, Rd→R0/en；When SOC → 0, Rd→R0；
Charging process:
Wherein when SOC → 0, Rc→R0/en；When SOC → 1, Rc→R0；
In formula, RdFor the sagging coefficient of energy-storage module electric discharge, RcFor the sagging coefficient of energy-storage module charging, R0For at the beginning of energy-storage module
Begin sagging coefficient, and n is balancing speed regulatory factor, and SOC is energy-storage module residual capacity.
Further, according to the product of sagging coefficient and energy-storage module output power obtained by step 4, i.e. DC bus-bar voltage
Fall value are as follows:
Discharge process: Δ udc-d=RdP=(R0/enSOC)·P (3)；
Charging process: Δ udc-c=RcP=(R0/en(1-SOC))·P (4)；
In formula, Δ udc-dFall value, Δ u for DC bus-bar voltage in discharge processdc-cFor DC bus electricity in charging process
Pressure falls value, and P is energy-storage module output power.
Compared with prior art, the present invention has the advantage that
1, distributed energy storage modular power distribution still uses sagging control, remains the excellent of the sagging original control algolithm of control
Point；
2, on the basis of traditional sagging control, the relationship of sagging coefficient Yu each energy-storage module residual capacity SOC is constructed, is made
Each energy-storage module exports to system according to the size of residual capacity or absorbs power, to realize that bearing power is divided equally and each distribution
The SOC balance of formula energy-storage module；
3, what this control method made DC bus-bar voltage in system operation falls that value is sufficiently small, and there is no need to using low
Bandwidth communication carries out voltage compensation i.e. and can guarantee DC bus-bar voltage operation within the allowable range, simplifies the complexity of system
And improve the reliability of system.
Detailed description of the invention
Fig. 1 is distributed energy storage wired in parallel control structure figure.
Fig. 2 is energy-storage module Charge-discharge wave shape figure under the sagging control strategy of tradition.
Fig. 3 is energy-storage module Charge-discharge wave shape figure when document [1] adaptive sagging control no-voltage compensates.
Fig. 4 is energy-storage module Charge-discharge wave shape figure under new control strategy.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
Steps are as follows for the method for the present invention:
Step 1, the DC micro power grid system for constructing two distributed energy storage wired in parallel, whole control block diagram such as attached drawing 1
It is shown；
Step 2, the state-of-charge SOC for obtaining each energy-storage module current time；
Step 3 obtains the sagging coefficient of charge and discharge of each distributed energy storage module according to the functional relation being newly fitted；It is described
The functional relation being newly fitted are as follows:
Discharge process:
Wherein, when SOC → 1, Rd→R0/en；When SOC → 0, Rd→R0；
Charging process:
Wherein when SOC → 0, Rc→R0/en；When SOC → 1, Rc→R0；
In formula, RdFor the sagging coefficient of energy-storage module electric discharge, RcFor the sagging coefficient of energy-storage module charging, R0For at the beginning of energy-storage module
Begin sagging coefficient, and n is balancing speed regulatory factor, and SOC is energy-storage module residual capacity.
Step 4, the droop control method without interconnected communication based on SOC, by DC bus reference voltage and sagging coefficient
It is poor to make with the product of energy-storage module output power, obtains energy-storage module output end reference voltage；
The product of gained sagging coefficient and energy-storage module output power, i.e. DC bus-bar voltage fall value are as follows:
Discharge process: Δ udc-d=RdP=(R0/enSOC)·P (3)；
Charging process: Δ udc-c=RcP=(R0/en(1-SOC))·P (4)；
In formula, Δ udc-dFall value, Δ u for DC bus-bar voltage in discharge processdc-cFor DC bus electricity in charging process
Pressure falls value, and P is energy-storage module output power.
Energy-storage module output end reference voltage and output end virtual voltage are obtained voltage error value as difference by step 5, through PI
It is used as current signal reference value after adjuster output, then obtains error current value as difference with actual current, and is input to PI adjusting
Device obtains modulated signal；
Modulated signal is generated pwm pulse wave by PWM modulation by step 6, to control two-way DC/DC converter switches
The charge and discharge process of distributed energy storage module is realized in the conducting and shutdown of pipe.
Effectiveness of the invention is verified below.
System parameter is as follows: system dc bus bar side voltage 760V；Battery side voltage 250V；The initial sagging system of energy-storage module
Number R0For 6e-4；Balancing speed regulatory factor n is 5；Under discharge mode, energy-storage module 1,2 initial SOC are respectively 0.9,0.8；It fills
Under power mode, energy-storage module 1,2 initial SOC are 0.4,0.3；Simulation result is as shown in attached drawing 2~4.Fig. 2 is the sagging control of tradition
The lower energy-storage module Charge-discharge wave shape figure of strategy, Fig. 3 are energy-storage module charge and discharge when document [1] adaptive sagging control no-voltage compensates
Electrical waveform figure, Fig. 4 are energy-storage module Charge-discharge wave shape figure under new control strategy.Comparison diagram 2~4 is as can be seen that using under tradition
Each energy-storage module output power ratio of control strategy that hangs down is constant, and each energy-storage module SOC can not be balanced, and DC bus-bar voltage occurs
Apparent deviation；Using document [1] although in adaptive sagging control realize each energy-storage module and exported according to SOC dynamic adjustment
Power, but the DC bus-bar voltage that causes of the method bigger than normal, the general especially in the lesser discharge process of energy-storage module SOC that falls value
Cause DC bus-bar voltage beyond allowed band, influences the stability of micro-capacitance sensor operation, it is therefore desirable to which low bandwidth communication is to bus
Voltage compensates, and increases the complexity of system, reduces the reliability of system；Using control strategy proposed by the present invention
Each energy-storage module is set to be exported according to the size of residual capacity to system or absorb power, to realize that bearing power is divided equally and each point
The SOC balance of cloth energy-storage module, while it is that can guarantee that direct current is female that this control method, which carries out voltage compensation without low bandwidth communication,
Line voltage is run within the allowable range, therefore is simplified the complexity of system and improved the reliability of system.In conjunction with above
Described and each waveform diagram can verify the validity and feasibility of method proposed by the invention.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (3)
1. it is a kind of based on SOC without interconnected communication distributed energy storage droop control method, which is characterized in that the method step is such as
Under:
Step 1, the DC micro power grid system of two distributed energy storage wired in parallel is constructed；
Step 2, the state-of-charge SOC at each energy-storage module current time is obtained；
Step 3, the sagging coefficient of charge and discharge of each distributed energy storage module is obtained according to the functional relation being newly fitted；
Step 4, the droop control method without interconnected communication based on SOC, by DC bus reference voltage and sagging coefficient and storage
It is poor that the product of energy module output power is made, and obtains energy-storage module output end reference voltage；
Step 5, energy-storage module output end reference voltage and output end virtual voltage are obtained into voltage error value as difference, is adjusted through PI
It is used as current signal reference value after device output, then obtains error current value as difference with actual current, and be input to pi regulator and obtain
To modulated signal；
Step 6, modulated signal is generated into pwm pulse wave by PWM modulation, to control two-way DC/DC converter switches pipe
Conducting and shutdown, realize the charge and discharge process of distributed energy storage module.
2. it is according to claim 1 it is a kind of based on SOC without interconnected communication distributed energy storage droop control method, feature
It is, in step 3, the functional relation being newly fitted are as follows:
Discharge process:
Wherein, when SOC → 1, Rd→R0/en；When SOC → 0, Rd→R0；
Charging process:
Wherein when SOC → 0, Rc→R0/en；When SOC → 1, Rc→R0；
In formula, RdFor the sagging coefficient of energy-storage module electric discharge, RcFor the sagging coefficient of energy-storage module charging, R0For energy-storage module it is initial under
Hang down coefficient, and n is balancing speed regulatory factor, and SOC is energy-storage module residual capacity.
3. it is according to claim 1 it is a kind of based on SOC without interconnected communication distributed energy storage droop control method, feature
It is, according to the product of sagging coefficient and energy-storage module output power obtained by step 4, i.e. DC bus-bar voltage falls value are as follows:
Discharge process: Δ udc-d=RdP=(R0/enSOC)·P (3)；
Charging process: Δ udc-c=RcP=(R0/en(1-SOC))·P (4)；
In formula, Δ udc-dFall value, Δ u for DC bus-bar voltage in discharge processdc-cFall for DC bus-bar voltage in charging process
Value is fallen, P is energy-storage module output power.
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Cited By (11)
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| CN109713660A (en) * | 2019-03-07 | 2019-05-03 | 上海禧龙科技股份有限公司 | Direct-current grid parallel connection energy-storage battery state-of-charge balance control method and device |
| CN110912110A (en) * | 2019-11-15 | 2020-03-24 | 东南大学 | Dynamic self-adaptive droop control method for direct-current micro-grid |
| CN111181207A (en) * | 2020-01-07 | 2020-05-19 | 重庆理工大学 | Distributed lithium battery pack energy storage system |
| CN111224416A (en) * | 2020-02-19 | 2020-06-02 | 燕山大学 | SOC (System on chip) balance-based parallel control method and system for cascaded energy storage converters |
| CN111301181A (en) * | 2020-03-09 | 2020-06-19 | 中车青岛四方车辆研究所有限公司 | Direct-current power supply system and control method thereof, train and method for train to enter and exit non-network area |
| CN112436501A (en) * | 2020-11-17 | 2021-03-02 | 安徽工业大学 | Improved balance control method for multiple energy storage units of direct-current micro-grid |
| CN112713605A (en) * | 2020-12-24 | 2021-04-27 | 太原科技大学 | SOC (State of Charge) balancing method for non-equal-capacity battery energy storage unit of alternating-current micro-grid |
| CN112751332A (en) * | 2021-01-06 | 2021-05-04 | 曲阜师范大学 | Direct-current micro-grid energy storage system SOC balance control method based on droop control |
| CN112952867A (en) * | 2021-03-30 | 2021-06-11 | 燕山大学 | Method for suppressing output voltage unbalance of energy storage power converter under asymmetric load |
| CN113193245A (en) * | 2021-04-28 | 2021-07-30 | 太原科技大学 | SOH (State of health) balancing method for distributed battery energy storage system of micro-grid |
| CN114243890A (en) * | 2021-12-28 | 2022-03-25 | 深圳市伊力科电源有限公司 | Smart stick group power supply control method, smart stick and computer readable storage medium |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109713660A (en) * | 2019-03-07 | 2019-05-03 | 上海禧龙科技股份有限公司 | Direct-current grid parallel connection energy-storage battery state-of-charge balance control method and device |
| CN109713660B (en) * | 2019-03-07 | 2021-01-26 | 上海禧龙科技股份有限公司 | Charge state balance control method and device for parallel energy storage batteries of direct-current micro-grid |
| CN110912110A (en) * | 2019-11-15 | 2020-03-24 | 东南大学 | Dynamic self-adaptive droop control method for direct-current micro-grid |
| CN111181207A (en) * | 2020-01-07 | 2020-05-19 | 重庆理工大学 | Distributed lithium battery pack energy storage system |
| CN111224416A (en) * | 2020-02-19 | 2020-06-02 | 燕山大学 | SOC (System on chip) balance-based parallel control method and system for cascaded energy storage converters |
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| CN111301181A (en) * | 2020-03-09 | 2020-06-19 | 中车青岛四方车辆研究所有限公司 | Direct-current power supply system and control method thereof, train and method for train to enter and exit non-network area |
| CN112436501B (en) * | 2020-11-17 | 2022-04-01 | 安徽工业大学 | Improved balance control method for multiple energy storage units of direct-current micro-grid |
| CN112436501A (en) * | 2020-11-17 | 2021-03-02 | 安徽工业大学 | Improved balance control method for multiple energy storage units of direct-current micro-grid |
| CN112713605A (en) * | 2020-12-24 | 2021-04-27 | 太原科技大学 | SOC (State of Charge) balancing method for non-equal-capacity battery energy storage unit of alternating-current micro-grid |
| CN112713605B (en) * | 2020-12-24 | 2023-07-14 | 太原科技大学 | SOC (State of charge) equalization method for non-constant-volume battery energy storage unit of alternating-current micro-grid |
| CN112751332A (en) * | 2021-01-06 | 2021-05-04 | 曲阜师范大学 | Direct-current micro-grid energy storage system SOC balance control method based on droop control |
| CN112952867A (en) * | 2021-03-30 | 2021-06-11 | 燕山大学 | Method for suppressing output voltage unbalance of energy storage power converter under asymmetric load |
| CN112952867B (en) * | 2021-03-30 | 2023-09-22 | 燕山大学 | Method for inhibiting unbalance of output voltage of energy storage power converter under asymmetric load |
| CN113193245A (en) * | 2021-04-28 | 2021-07-30 | 太原科技大学 | SOH (State of health) balancing method for distributed battery energy storage system of micro-grid |
| CN114243890A (en) * | 2021-12-28 | 2022-03-25 | 深圳市伊力科电源有限公司 | Smart stick group power supply control method, smart stick and computer readable storage medium |
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Application publication date: 20190226 |