CN109980765A - A kind of energy-storage system charge/discharge control method and system based on dual freedom PID - Google Patents
A kind of energy-storage system charge/discharge control method and system based on dual freedom PID Download PDFInfo
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- CN109980765A CN109980765A CN201811615102.9A CN201811615102A CN109980765A CN 109980765 A CN109980765 A CN 109980765A CN 201811615102 A CN201811615102 A CN 201811615102A CN 109980765 A CN109980765 A CN 109980765A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of energy-storage system charge/discharge control method based on dual freedom PID, include: whether the state for judging that energy-storage system is current is charge or discharge state, if it is, the charging current of energy-storage system or the target value of discharge current are then obtained according to electric parameter relevant to electrical system, the charging current value or discharge current value of energy-storage system are obtained in real time, and it is handled using glide filter the algorithm charging current value or discharge current value to acquisition, with obtain that treated real time charging current value or real-time discharge current value, according to obtain that treated real time charging current value or real-time discharge current value, and the charging current of energy-storage system or the target value of discharge current obtained calculates difference between the two, and two degrees of freedom calculating is carried out according to the difference, to obtain the duty of energy-storage system switch element Than.The present invention can solve the technical issues of existing method not can be implemented simultaneously optimal charging and discharging currents response speed and best anti-interference.
Description
Technical field
The invention belongs to electrical technical field of energy storage, more particularly, to a kind of energy-storage system based on dual freedom PID
Charge/discharge control method and system.
Background technique
Currently, energy storage technology has been widely used for multiple important industries such as the energy, traffic, electric power, especially current right
Under the ever-increasing situation of demand of distributed energy key link (such as energy management, power bridge, micro-capacitance sensor etc.), storage
Energy technology will welcome more powerful development.It is directed to the research of energy storage technology at present, is mainly reflected in energy-storage system topology and charge and discharge
Two aspects of electric control method.
For the charge/discharge control method of energy-storage system, mainstream is calculated using the closed loop of one-dimensional freedom degree at present
Method, such as traditional ratio, integral and differential (Proportion-Integral-Derivative, abbreviation PID) method obscure
PID approach etc..
However, above-mentioned charge/discharge control method haves the defects that some can not ignore: first, charging and discharging currents can only be made
Response speed is optimal, or is optimal charge and discharge process anti-interference, and but cannot achieve makes the two while being optimal；
Second, as the application environment of energy-storage system becomes increasingly complex, the requirement to charge and discharge electrical efficiency and security and stability is increasingly
Height, but above-mentioned control method is unable to satisfy the requirement.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of storages based on dual freedom PID
Energy system charge/discharge control method and system, it is intended that solving can not be simultaneously present in existing charge/discharge control method
The technical issues of realizing optimal charging and discharging currents response speed and best anti-interference, and be unable to satisfy when energy-storage system is answered
When used in complicated application environment, the technical issues of requirement to charge and discharge electrical efficiency and security and stability.
To achieve the above object, according to one aspect of the present invention, a kind of energy storage system based on dual freedom PID is provided
System charge/discharge control method, which applied in electrical system, the described method comprises the following steps:
(1) judge whether the current state of energy-storage system is charge or discharge state, if it is, (2) are entered step, it is no
Then process terminates；
(2) charging current of energy-storage system or the target of discharge current are obtained according to electric parameter relevant to electrical system
Value；
(3) charging current value or discharge current value of energy-storage system are obtained in real time, and using glide filter algorithm to acquisition
The charging current value or discharge current value handled, with obtain that treated real time charging current value or real-time discharge current
Value；
(4) treated according to obtained in step (3) real time charging current value or real-time discharge current value and step
(2) charging current of energy-storage system or the target value of discharge current obtained in calculates difference between the two, and according to the difference
Value carries out two degrees of freedom calculating, to obtain the duty ratio of energy-storage system switch element.
Preferably relevant electric parameter is that the variation of size in electric system will affect energy-storage system just with electrical system
The electric parameter often run, the electric parameter are preferably voltage, or preferably voltage and current.
Preferably, it is using following formula that target value is obtained in step (2):
Wherein n indicates the quantity of electric parameter relevant with electrical system, ωkIt indicates k-th relevant to electrical system
The weighted value of electric parameter, and meetxkIndicate k-th of electric parameter relevant to electrical system relative to energy storage
The per unit value of system voltage.
Preferably, weighted value ωkSpecific value be by the corresponding component of the electric parameter for energy-storage system charge and discharge
The influence degree of process determines.
Preferably, step (4) is using following formula:
U (s)=bKp[e(s)-e(s-1)]+Kie(s)+cKd[e(s)-2e(s-1)+e(s-2)]
Wherein u (s) indicates the duty ratio of the element for the control energy-storage system charge or discharge that this process is calculated, e
(s) difference being calculated for this process, e (s-1) are the difference that last process is calculated, and e (s-2) is the upper last time
The difference that process is calculated, KpFor two degrees of freedom proportionality coefficient, KiFor two degrees of freedom integral coefficient, KdFor two degrees of freedom differential
Coefficient, b and c are two degrees of freedom regulation coefficient.
Preferably, two degrees of freedom Proportional coefficient Kp, two degrees of freedom integral coefficient Ki, two degrees of freedom differential coefficient KdAnd two
Freedom degree regulation coefficient b and c are by using pid parameter setting algorithm to electrical ginseng relevant to electrical system in step (2)
Number obtains after carrying out adjusting processing, and pid parameter setting algorithm is fuzzy adaptive algorithm or particle swarm algorithm.
Preferably, the method further includes the following steps after step (4):
(5) whether the duty ratio that energy storage switch element is controlled obtained in judgment step (4) is enabling to energy-storage system just
Often work if it is makes the switch element of energy-storage system with the duty cycle, then return step (1), hence under
The charging current value of primary acquisition energy-storage system or the process of discharge current value, are otherwise adjusted the duty ratio, then
Return step (1), the process of charging current value or discharge current value hence into acquisition energy-storage system next time.
Preferably, duty ratio is adjusted in step (5) is by the duty ratio multiplied by a proportionality coefficient, to obtain new
Duty ratio, which is the number between 0 to 1, and size depends on energy-storage system voltage during discharge, is being charged
The mutation content of the DC bus-bar voltage of energy-storage system front end is depended in the process.
It is another aspect of this invention to provide that providing a kind of energy-storage system charge and discharge control system based on dual freedom PID
System, which applied in electrical system, and the energy-storage system charge-discharge control system includes:
First module, for judging whether the current state of energy-storage system is charge or discharge state, if it is, into
Second module, else process terminate；
Second module, for obtaining the charging current or electric discharge of energy-storage system according to electric parameter relevant to electrical system
The target value of electric current；
Third module for obtaining the charging current value or discharge current value of energy-storage system in real time, and uses glide filter
Algorithm handles the charging current value or discharge current value of acquisition, with obtain that treated real time charging current value or reality
When discharge current value；
4th module, for according to third module obtain that treated real time charging current value or real-time discharge current
The charging current of energy-storage system or the target value of discharge current that value and the second module obtain calculate difference between the two,
And two degrees of freedom calculating is carried out according to the difference, to obtain the duty ratio of energy-storage system switch element.
Preferably, the system further comprises the 5th module, the control energy storage switch obtained for judging the 4th module
Whether the duty ratio of element enables to energy-storage system to work normally, and if it is makes the switch element of energy-storage system with the duty
Than work, the first module is then returned to, hence into the charging current value or discharge current value of acquisition energy-storage system next time
Process, otherwise the duty ratio be adjusted, then return to the first module, hence into acquisition energy-storage system next time
The process of charging current value or discharge current value.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) since present invention employs step (2) to arrive step (4), the mesh of reasonable charging current or discharge current is determined
Scale value, difference required for obtaining dual freedom PID operation according to the target value and actual value, then freely by separately adjustable two
Spend the speed responsive COEFFICIENT K of PID arithmeticp、KiAnd KdAnd two degrees of freedom regulation coefficient b and c, it can be achieved at the same time optimal
Charging and discharging currents response speed and best anti-interference；
(2) charging current of energy-storage system or the reasonable mesh of discharge current are obtained by weight and per unit value due to the present invention
Scale value, the target value can be good fit with energy-storage system, so as to guarantee that energy-storage system charge and discharge electrical efficiency is high, the course of work
Middle safety and stability；
(3) since present invention employs duty ratio of the step (5) to control energy storage switch element to optimize adjusting, thus
Enable to energy-storage system of the invention that can work normally in the case where voltage jump, so that energy-storage system is being answered
When used in complicated application environment, the requirement to charge and discharge electrical efficiency and security and stability can satisfy；
(4) present invention is during obtaining real-time current, using the glide filter for being more applicable for energy-storage system control
Algorithm, so as to realize the control more accurate to charging and discharging currents.
Detailed description of the invention
Fig. 1 is the flow chart of the energy-storage system charge/discharge control method the present invention is based on dual freedom PID.
Fig. 2 is the Brake energy recovery and the system of utilization that energy-storage system charge/discharge control method of the invention is applied to
Circuit structure diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Two parameter compensator method is applied primarily to all higher for signal trace performance and anti-interference ability requirement
Field mainly includes four kinds of feed-forward type structure, filtering type structure, feedback compensation type structure, loop compensation type structure etc. basic knots
Structure, it is innumerable for evolved structure on its basis, but its root is the thought of two degrees of freedom, the present invention by its with
Its correlation thought is merged into the charge and discharge control of energy-storage system, to solve charge and discharge process by the fusion of energy-storage system characteristic item
The response speed and anti-interference problem of charging and discharging currents.
As shown in Figure 1, a kind of energy-storage system charge/discharge control method based on dual freedom PID of the present invention, the energy storage system
System be apply in electrical system (such as energy recycling system, power grid energy-storage system etc.), method includes the following steps:
(1) judge whether the current state of energy-storage system is charge or discharge state, if it is, (2) are entered step, it is no
Then process terminates；
In this step, energy-storage system is in charge or discharge state, on the one hand means that the energy-storage system meets itself
On the other hand the requirement of charge or discharge state means that the electrical system meets the requirement of charge or discharge state.
(2) charging current of energy-storage system or the target of discharge current are obtained according to electric parameter relevant to electrical system
Value；
Specifically, electric parameter relevant with electrical system refers to that the variation of size in electric system will affect energy storage
The electric parameter that system operates normally must include voltage, also may include electric current.Specifically, related to electrical system
Electric parameter include but is not limited to: the electric current of energy-storage system, the voltage of energy-storage system, in electrical system except the energy-storage system
Except other one or more modules electric current, voltage etc..
It is using following formula that target value is obtained in this step:
Wherein n indicates the quantity of electric parameter relevant with electrical system (for example, if specified sum
The relevant electric parameter of electrical system includes the voltage and DC bus-bar voltage of the electric current of energy-storage system, energy-storage system, then this
When n be equal to 3), ωkIt indicates the weighted value of k-th of electric parameter relevant to electrical system, and meetsxkIndicate with
Per unit value of relevant k-th of the electric parameter of electrical system relative to energy-storage system voltage.
Furthermore, ωkSpecific value be by the corresponding component of the electric parameter for energy-storage system charge and discharge process
Influence degree determine, since influence of the voltage for energy-storage system charge and discharge process of energy-storage system itself is maximum,
Weighted value is also maximum (for example, 0.6), and influence of the electric current of energy-storage system itself for energy-storage system charge and discharge process occupies
In second, therefore also only weighted value more corresponding than the voltage of energy-storage system itself is small (for example, for its corresponding weighted value
0.2), and so on.
(3) charging current value or discharge current value of energy-storage system are obtained in real time, and using glide filter algorithm to acquisition
The charging current value or discharge current value handled, with obtain that treated real time charging current value or real-time discharge current
Value；
Specifically, charging current value or discharge current value are obtained in this step in real time, can pass through but is not limited to simulate
Circuit is realized, or is realized by FPGA, or is realized by the analog-to-digital conversion module of microprocessor.
Glide filter algorithm used in this step including but not limited to slides median filtering algorithm, sliding average filter
Wave algorithm.
(4) treated according to obtained in step (3) real time charging current value or real-time discharge current value and step
(2) charging current of energy-storage system or the target value of discharge current obtained in calculates difference between the two, and according to the difference
Value carries out two degrees of freedom calculating, to obtain the duty ratio of energy-storage system switch element；
Specifically, this step is using following formula:
U (s)=bKp[e(s)-e(s-1)]+Kie(s)+cKd[e(s)-2e(s-1)+e(s-2)]
Wherein u (s) indicates the duty ratio of the element for the control energy-storage system charge or discharge that this process is calculated, e
(s) difference being calculated for this process, e (s-1) are the difference that last process is calculated, and e (s-2) is the upper last time
The difference that process is calculated, KpFor two degrees of freedom proportionality coefficient, KiFor two degrees of freedom integral coefficient, KdFor two degrees of freedom differential
Coefficient, b and c are two degrees of freedom regulation coefficient.
Two degrees of freedom Proportional coefficient K used in above-mentioned formulap, two degrees of freedom integral coefficient Ki, two degrees of freedom differential coefficient
KdAnd two degrees of freedom regulation coefficient b and c are by using pid parameter setting algorithm to related to electrical system in step (2)
Electric parameter carry out adjusting processing after obtain, pid parameter setting algorithm used in this step is including but not limited to fuzzy
Adaptive algorithm and particle swarm algorithm.
(5) whether the duty ratio that energy storage switch element is controlled obtained in judgment step (4) is enabling to energy-storage system just
Often work if it is makes the switch element of energy-storage system with the duty cycle, then return step (1), hence under
The charging current value of primary acquisition energy-storage system or the process of discharge current value, are otherwise adjusted the duty ratio, then
Return step (1), the process of charging current value or discharge current value hence into acquisition energy-storage system next time；
For example, if in discharge process, the duty ratio being calculated is 0.4, and DC bus-bar voltage occurs at this time
Mutation, energy-storage system just can not regular picture at this time；Likewise, if the duty ratio being calculated is 0.4 in charging process,
And energy-storage system voltage mutates at this time, energy-storage system can not just charge normal at this time.
Duty ratio is adjusted in this step, specifically by the duty ratio multiplied by a proportionality coefficient, to obtain new
Duty ratio.In the present invention, which is the number between 0 to 1, and size depends on energy-storage system electricity during discharge
Pressure depends on the mutation content of the DC bus-bar voltage of energy-storage system front end during the charging process, and mutation content is bigger, then ratio
Coefficient is bigger, on the contrary then proportionality coefficient is smaller.In the present embodiment, the preferred value of proportionality coefficient is between 0.6 to 0.9.
Example
Below by taking electrical system is for the Brake energy recovery of high capacity car and using system as an example, to side of the invention
Method is described further.
As shown in Fig. 2, Brake energy recovery with mainly include that the DC/DC transformation that is made of IGBT element is single using system
Hybrid energy-storing unit two parts that member and super capacitor and battery are constituted.Its working principle is exactly mine car system in simple terms
When dynamic, braking energy is stored by DC/DC converter unit to super capacitor and accumulator hybrid energy-storing unit, realizes braking energy
Recycling；When mine car accelerates, by DC/DC converter unit by super capacitor and the braking stored by accumulator hybrid energy-storing unit
Energy feedback realizes the feedback of braking energy to the dynamical system of mine car.
Since this example in the present invention is illustrated only as control flow example, so its circuit structure and work
Principle just no longer repeats in detail.It should be noted that Brake energy recovery and charging process and discharge process base using system
This is similar, is only illustrated by taking charging process as an example herein.
The present invention is based on the hybrid energy-storing unit charge control method of dual freedom PID the following steps are included:
(1) judge whether the current state of hybrid energy-storing unit is charged state, if it is, entering step (2), otherwise
Process terminates；
(2) according to battery voltage, super-capacitor voltage, high capacity car DC bus-bar voltage, high capacity car DC bus
The electrical quantity such as electric current determine Brake energy recovery and the charging current using system；
It is using following formula that target value is obtained in this step:
Wherein ω1=0.7, x1Indicate battery voltage；ω2=0.2, x2Indicate super-capacitor voltage phase
For the per unit value of battery voltage；ω3=0.1, x3Indicate mark of the high capacity car DC bus-bar voltage relative to battery voltage
Value；ω4=0.1, x4Indicate per unit value of the high capacity car DC bus current relative to battery voltage.
(3) charging current value of hybrid energy-storing unit, and the charging using glide filter algorithm to acquisition are obtained in real time
Current value is handled, with the real time charging current value that obtains that treated；
(4) mixing obtained in treated according to obtained in step (3) real time charging current value and step (2)
The target value of the charging current of energy-storage units calculates difference between the two, and carries out two degrees of freedom calculating according to the difference, with
Obtain the duty ratio of switch element S2, S3 in hybrid energy-storing unit；
Specifically, this step is using following formula:
U (s)=bKp[e(s)-e(s-1)]+Kie(s)+cKd[e(s)-2e(s-1)+e(s-2)]
Wherein u (s) indicates the duty ratio for switch element S2, S3 that this process is calculated, and e (s) is this process meter
Obtained difference, e (s-1) are the difference that last process is calculated, and the upper last process of e (s-2) is calculated
Difference, Kp are two degrees of freedom proportionality coefficient, and Ki is two degrees of freedom integral coefficient, and Kd is two degrees of freedom differential coefficient, and b and c are two
Freedom degree regulation coefficient.
Two degrees of freedom Proportional coefficient K p, two degrees of freedom integral coefficient Ki used in above-mentioned formula, two degrees of freedom differential system
Number Kd and two degrees of freedom regulation coefficient b and c be by using pid parameter setting algorithm in step (2) with electrical system phase
The electric parameter of pass obtains after carrying out adjusting processing, and pid parameter setting algorithm used in this step includes using being fuzzy
Adaptive algorithm.
(5) whether the duty ratio of switch element S2, S3 obtained in judgment step (4) are enabling to hybrid energy-storing unit just
Often work (specifically judges the multiple proportion of battery voltage and super capacitor, if the voltage of super capacitor is greater than battery
3 times of voltage, then it represents that can work normally), if it is return step (1), hence into acquisition energy-storage system next time
Charging current value process, otherwise the duty ratio is adjusted, then return step (1), hence into obtaining next time
Take the process of the charging current value of energy-storage system；
Specifically, duty ratio is adjusted be exactly by the duty ratio of S2, S3 multiplied by 0.6 proportionality coefficient.
In conclusion the invention proposes a kind of energy-storage system charge/discharge control method based on dual freedom PID, it is intended to
Charging and discharging currents response speed and stablizing for charge and discharge process in energy-storage system charge and discharge process are controlled by two parameter compensator
It makes while being optimal, have the advantage that
(1) present invention can guarantee charge and discharge using the charge and discharge process of two parameter compensator method control energy-storage system
The anti-interference ability that charge and discharge process is improved while electric current response rate, makes response speed and anti-interference ability while reaching
It is optimal, and then improve the performance of energy-storage system.
(2) present invention is first using fuzzy adaptive algorithm, particle swarm algorithm etc. in dual freedom PID coefficient tuning process
Into setting algorithm, the accuracy of two degrees of freedom coefficient ensure that, and then improve the charge-discharge performance of energy-storage system.
(3) present invention is during obtaining real-time current, using the sliding intermediate value for being more applicable for energy-storage system control
The advanced glide filter algorithm such as filtering algorithm, sliding average filtering algorithm, may be implemented more accurate to charging and discharging currents
Control.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of energy-storage system charge/discharge control method based on dual freedom PID, which applied in electrical system
In, which is characterized in that it the described method comprises the following steps:
(1) judge whether the current state of energy-storage system is charge or discharge state, if it is, enter step (2), otherwise mistake
Journey terminates；
(2) charging current of energy-storage system or the target value of discharge current are obtained according to electric parameter relevant to electrical system；
(3) charging current value or discharge current value of energy-storage system are obtained in real time, and acquisition is somebody's turn to do using glide filter algorithm
Charging current value or discharge current value are handled, with obtain that treated real time charging current value or real-time discharge current value；
(4) treated according to obtained in step (3) real time charging current value or real-time discharge current value and step (2)
The charging current of the energy-storage system of middle acquisition or the target value of discharge current calculate difference between the two, and according to the difference into
Row two degrees of freedom calculates, to obtain the duty ratio of energy-storage system switch element.
2. energy-storage system charge/discharge control method according to claim 1, which is characterized in that
Electric parameter relevant with electrical system is that the variation of size in electric system will affect the electricity of energy-storage system normal operation
Gas parameter；
The electric parameter is preferably voltage, or preferably voltage and current.
3. energy-storage system charge/discharge control method according to claim 1, which is characterized in that obtain target in step (2)
Value is using following formula:
Wherein n indicates the quantity of electric parameter relevant with electrical system, ωkIndicate k-th relevant to electrical system electrical ginseng
Several weighted values, and meetxkIndicate k-th of electric parameter relevant to electrical system relative to energy-storage system electricity
The per unit value of pressure.
4. energy-storage system charge/discharge control method according to claim 1, which is characterized in that weighted value ωkSpecific value
It is that the influence degree of energy-storage system charge and discharge process is determined by the electric parameter corresponding component.
5. energy-storage system charge/discharge control method according to claim 1, which is characterized in that step (4) is using following
Formula:
U (s)=bKp[e(s)-e(s-1)]+Kie(s)+cKd[e(s)-2e(s-1)+e(s-2)]
Wherein u (s) indicates the duty ratio of the element for the control energy-storage system charge or discharge that this process is calculated, and e (s) is
The difference that this process is calculated, e (s-1) are the difference that last process is calculated, and e (s-2) is upper last process
The difference being calculated, KpFor two degrees of freedom proportionality coefficient, KiFor two degrees of freedom integral coefficient, KdFor two degrees of freedom differential coefficient,
B and c is two degrees of freedom regulation coefficient.
6. energy-storage system charge/discharge control method according to claim 5, which is characterized in that
Two degrees of freedom Proportional coefficient Kp, two degrees of freedom integral coefficient Ki, two degrees of freedom differential coefficient KdAnd two degrees of freedom adjustment
Coefficient b and c are to be adjusted by using pid parameter setting algorithm to electric parameter relevant to electrical system in step (2)
It is obtained after processing；
Pid parameter setting algorithm is fuzzy adaptive algorithm or particle swarm algorithm.
7. energy-storage system charge/discharge control method according to claim 1, which is characterized in that further comprise in step
(4) following steps after:
(5) whether the duty ratio that energy storage switch element is controlled obtained in judgment step (4) enables to the normal work of energy-storage system
Make, if it is makes the switch element of energy-storage system with the duty cycle, then return step (1), hence into next time
Acquisition energy-storage system charging current value or discharge current value process, otherwise the duty ratio is adjusted, is then returned
Step (1), the process of charging current value or discharge current value hence into acquisition energy-storage system next time.
8. energy-storage system charge/discharge control method according to claim 7, which is characterized in that duty ratio in step (5)
Being adjusted is by the duty ratio multiplied by a proportionality coefficient, to obtain new duty ratio, which is between 0 to 1
Number, size depend on energy-storage system voltage during discharge, depend on the direct current of energy-storage system front end during the charging process
The mutation content of busbar voltage.
9. a kind of energy-storage system charge-discharge control system based on dual freedom PID, which applied in electrical system
In, which is characterized in that the energy-storage system charge-discharge control system includes:
First module, for judging whether the current state of energy-storage system is charge or discharge state, if it is, into second
Module, else process terminate；
Second module, for obtaining the charging current or discharge current of energy-storage system according to electric parameter relevant to electrical system
Target value；
Third module for obtaining the charging current value or discharge current value of energy-storage system in real time, and uses glide filter algorithm
The charging current value or discharge current value of acquisition are handled, put with the real time charging current value that obtains that treated or in real time
Electric current value；
4th module, for according to the third module real time charging current value that obtains that treated or real-time discharge current value, with
And second the charging current of energy-storage system that obtains of module or the target value of discharge current calculate difference between the two, and according to
The difference carries out two degrees of freedom calculating, to obtain the duty ratio of energy-storage system switch element.
10. energy-storage system charge-discharge control system according to claim 9, which is characterized in that further comprise the 5th mould
Block, for judging whether the duty ratio of control energy storage switch element that the 4th module obtains enables to the normal work of energy-storage system
Make, if it is makes the switch element of energy-storage system with the duty cycle, the first module is then returned to, hence into next time
Acquisition energy-storage system charging current value or discharge current value process, otherwise the duty ratio is adjusted, is then returned
First module, the process of charging current value or discharge current value hence into acquisition energy-storage system next time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811615102.9A CN109980765B (en) | 2018-12-27 | 2018-12-27 | Energy storage system charge-discharge control method and system based on two-degree-of-freedom PID |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811615102.9A CN109980765B (en) | 2018-12-27 | 2018-12-27 | Energy storage system charge-discharge control method and system based on two-degree-of-freedom PID |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109980765A true CN109980765A (en) | 2019-07-05 |
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| CN113794249A (en) * | 2021-08-24 | 2021-12-14 | 浙江杭可科技股份有限公司 | Digital power box charge-discharge control algorithm and control system |
| CN113904396A (en) * | 2021-06-29 | 2022-01-07 | 苏州浪潮智能科技有限公司 | Method, system and apparatus for regulating charging current ripple of backup battery unit |
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