CN109066814A - The control method and system of energy storage device auxiliary fired power generating unit frequency modulation frequency modulation - Google Patents
The control method and system of energy storage device auxiliary fired power generating unit frequency modulation frequency modulation Download PDFInfo
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- CN109066814A CN109066814A CN201810998991.5A CN201810998991A CN109066814A CN 109066814 A CN109066814 A CN 109066814A CN 201810998991 A CN201810998991 A CN 201810998991A CN 109066814 A CN109066814 A CN 109066814A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of control methods and system using energy storage device auxiliary fired power generating unit frequency modulation frequency modulation.The control system that the present invention uses includes the power control module based on energy storage device state-of-charge and the time lag compensation module based on Smith Predictor.Control system receives frequency modulation frequency modulation instruction from power grid, fired power generating unit active power feedback, energy storage device state-of-charge and active power of output feedback；According to feedback data, control system, which is used, determines that energy storage device needs the active power that exports based on energy storage device state-of-charge method；Using Smith Predictor to being compensated in auxiliary frequency modulation system there are time lag after, control system obtains command power, and instruction is sent to energy storage device by communication apparatus, is compensated using energy storage device fast response characteristic to fired power generating unit generated output；Assisting frequency modulation system includes control system and energy storage device.The present invention can improve the dynamic property that fired power generating unit participates in electric system frequency modulation, obtain higher frequency modulation income.
Description
Technical field
The invention belongs to energy storage control fields, are related to the control of energy storage device, and especially a kind of energy storage device assists thermoelectricity
The control method and system of unit frequency modulation frequency modulation.
Background technique
In recent years, renewable energy accesses power grid on a large scale, and the uncertainty in power grid increasingly increases, to electric system tune
More stringent requirements are proposed for frequency.Traditional fired power generating unit fm capacity is weaker, climbing rate be typically only 2% unit rated capacity/
Minute, meanwhile, frequently quickly adjusting will increase fired power generating unit abrasion and coal consumption for power generation, jeopardize unit itself and power grid security.
Compared to fired power generating unit, energy storage device has the ability of Millisecond full power output, fast response time, thus can make
For auxiliary element, the ability that fired power generating unit participates in electric grid secondary frequency modulation is improved, while obtaining higher frequency modulation income.Energy storage device
Auxiliary fired power generating unit participates in electric grid secondary frequency modulation and gets the attention in recent years, also has many engineering project landings to implement.
Energy storage auxiliary frequency modulation system needs to consider two problems emphatically: 1) energy storage device state-of-charge need to be maintained to one
In reasonable range, energy storage is avoided to fill deep put deeply；2) there are many links comprising time lag for energy storage device auxiliary frequency modulation system, such as
Signal measurement, control execute, data are transmitted etc., and the time lag in these links adds up, it will to the property of auxiliary frequency modulation system
Important influence can be generated.Therefore, it is necessary to design control strategy, influence of the time lag to system performance is reduced.
Summary of the invention
To improve the performance that existing energy storage device assists fired power generating unit frequency modulation frequency modulation, it is auxiliary that the present invention provides a kind of energy storage device
The control method and system of fired power generating unit frequency modulation frequency modulation are helped, to reduce influence of the time lag to system performance, improves auxiliary frequency modulation system
The dynamic property of system obtains higher frequency modulation income.
For this purpose, the present invention adopts the following technical scheme that: the control method of energy storage device auxiliary fired power generating unit frequency modulation frequency modulation
And system, the control system include power control module based on energy storage device state-of-charge and based on Smith Predictor
Time lag compensation module, the control method includes the following steps:
1) control system described in receives AGC frequency modulation frequency modulation instruction from power grid, thermal motor by data acquisition device
Group active power of output feedback, energy storage device state-of-charge and active power of output are fed back, and are denoted as P respectivelyAGC, PGEN, SOC,
PESS；According to feedback data, it is active that control system uses the method based on energy storage device state-of-charge to determine that energy storage needs export
Power Pcmd,0；
2) auxiliary frequency modulation system time lag is compensated using Smith Predictor, control system obtains command power Pcmd,
And energy storage device is sent to by data transmission device, by energy storage device output order power；
The auxiliary frequency modulation system includes control system and energy storage device.
Supplement as above-mentioned technical proposal, it is true using the method based on energy storage device state-of-charge in the step 1)
Determine the active-power P that energy storage device needs to exportcmd,0Process it is as follows: firstly, obtaining in-between power:
Pcmd,1=PAGC-PGEN,
Then, continue to Pcmd,1Using slicing operation, P is obtainedcmd,0, clipping section and energy storage device state-of-charge phase
It closes.
Energy storage device state-of-charge is divided into three sections, respectively low section by supplement as above-mentioned technical proposal
[SOClow1,SOCup1], middle section [SOClow2,SOCup2] and high section [SOClow3,SOCup3], it is exported in low section energy storage device
Active power clipping section is [- Pmax,Pmax/k1], it is [- P in middle section energy storage device active power of output clipping sectionmax,
Pmax], it is [- P in high section energy storage device active power of output clipping sectionmax/k2,Pmax]；Wherein, SOClow1<SOCup1<
SOClow2<SOCup2<SOClow3<SOCup3For the parameter for judging state-of-charge section, PmaxFor energy storage maximum charge-discharge electric power, k1For
Low section charge and discharge clipping control coefrficient, k2For high section charge and discharge clipping control coefrficient.
Supplement as above-mentioned technical proposal, k1And k2According to auxiliary frequency modulation maximum revenue target, using heuritic approach
Optimization, which calculates, to be obtained.
Supplement as above-mentioned technical proposal, the control system use hysteresis when different state-of-charge sections switch
Control method.
Supplement as above-mentioned technical proposal, the hysteresis control method are as follows:
Control system default SOC is in middle section, and after auxiliary frequency modulation system starting, control system can be in a manner of hysteresis
It determines section locating for energy storage device SOC, i.e., ought meet SOC and be in middle section and SOC < SOCup1The section Shi Congzhong is switched to low area
Between, middle section and SOC > SOC are in when meeting SOClow3The section Shi Congzhong is switched to high section, is in low section when meeting SOC
And SOC > SOClow2When from low section be switched to middle section, be in high section and SOC < SOC when meeting SOCup2Shi Conggao is cut in section
Change to middle section.
Supplement as above-mentioned technical proposal compensates auxiliary frequency modulation system time lag using Smith Predictor, obtains
To the power instruction P to energy storage devicecmd:
Wherein, s is Laplace operator, KPAnd KIFor the scale parameter and integral parameter of pi controller,
PfeedbackFor the Feedback of Power amount containing compensation, τ is the auxiliary equivalent time lag of frequency modulation system, and H (s) is the auxiliary equivalent transmitting letter of frequency modulation system
Number.
The invention has the advantages that: by the way that energy storage device state-of-charge is divided into three sections, can to store up
Energy device executes different charge and discharge amplitude limit values in different sections, not only energy storage device state-of-charge can be made to be maintained at reasonable
Range, while can be by optimizing k1And k2Parameter is to obtain maximum frequency modulation income.The present invention is estimated by introducing based on Smith
The time lag compensation module of device can improve the dynamic property of auxiliary frequency modulation system, obtain higher frequency modulation income.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that frequency modulation system (including energy storage device and control system) is assisted in the embodiment of the present invention；
Fig. 2 is the power control schematic diagram based on energy storage device state-of-charge in the embodiment of the present invention；
Fig. 3 is the schematic illustration of the time lag compensation module based on Smith Predictor in the embodiment of the present invention；
Fig. 4 is to assist frequency modulation without energy storage device in the embodiment of the present invention and have the secondary tune of fired power generating unit of energy storage device frequency modulation
(upper figure is the fired power generating unit frequency modulation frequency modulation simulation result diagram of no energy storage device auxiliary frequency modulation to frequency simulation result comparison diagram, and dotted line is
AGC instruction, solid line are the output of fired power generating unit active power；The following figure is to have the fired power generating unit frequency modulation frequency modulation of energy storage device frequency modulation to emulate
Result figure, dotted line are AGC instruction, and solid line is that fired power generating unit and energy storage device combine active power output)；
Fig. 5 is SOC variation diagram in energy storage device one day in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, carries out clearly and completely to the technical solution in the present embodiment
Description, it is clear that described embodiment is only rather than whole example to a part of example of the present invention.Based on the present invention
In embodiment, those of ordinary skill in the art's every other implementation obtained under that premise of not paying creative labor
Example, shall fall within the protection scope of the present invention.
Frequency modulation system complete structure is assisted as shown in Figure 1, including energy storage device and control system two parts.Energy storage device master
It to be made of energy-storage battery and inverter two parts.Control system then includes the power control mould based on energy storage device state-of-charge
Block and time lag compensation module two parts based on Smith Predictor, it receives frequency modulation frequency modulation from power grid and instructs Pcmd, thermoelectricity
The feedback P of unit and energy storage deviceGEN, SOC, PESS.The difference of frequency modulation frequency modulation instruction and fired power generating unit active power of output is to store up
The active power that energy device needs to export, is denoted as Pcmd,1。
Pcmd,1=PAGC-PGEN,
Obtaining Pcmd,1Afterwards, it needs to carry out clipping operation to it according to energy storage device state-of-charge.
The symbol definition and explanation of part system variable in the attached drawing of the present invention of table 1
| Symbol | Definition and explanation |
| PAGC | The instruction of electric grid secondary frequency modulation |
| PGEN | Fired power generating unit active power of output feedback |
| PESS | Energy storage device active power of output feedback |
| SOC | Energy storage device charge state feedback |
| SOClow1,SOCup1 | The low section top/bottom latitude of energy storage device SOC |
| SOClow2,SOCup2 | Section top/bottom latitude in energy storage device SOC |
| SOClow3,SOCup3 | The section energy storage device SOC high top/bottom latitude |
| Pcmd,0 | Energy storage device power instruction median |
| Pcmd | Energy storage device power instruction |
| Pmax | Energy storage device maximum charge-discharge electric power |
| Pfeedback | The Feedback of Power amount containing compensation |
| H(s) | Assist frequency modulation system equivalent transfer function |
| τ | Assist the equivalent time lag of frequency modulation system |
| s | Laplace operator |
Power control based on energy storage device state-of-charge is as shown in Figure 2.Energy storage device state-of-charge is divided into three sections,
Respectively low section [SOClow1,SOCup1], middle section [SOClow2,SOCup2] and high section [SOClow3,SOCup3], in low section
Energy storage device active power of output clipping section is [- Pmax,Pmax/k1], in middle section energy storage device active power of output clipping
Section is [- Pmax,Pmax], it is [- P in high section energy storage device active power of output clipping sectionmax/k2,Pmax].Wherein
SOClow1<SOCup1<SOClow2<SOCup2<SOClow3<SOCup3, for the parameter for judging state-of-charge section, PmaxFor energy storage device
Maximum charge-discharge electric power, k1For low section charge and discharge clipping control coefrficient, k2For high section charge and discharge clipping control coefrficient, k1With
k2According to auxiliary frequency modulation maximum revenue target, is optimized using heuritic approach and calculate acquisition.
Control system default SOC is in middle section, and after auxiliary frequency modulation system starting, control system can be in a manner of hysteresis
It determines section locating for energy storage device SOC, i.e., ought meet SOC and be in middle section and SOC < SOCup1The section Shi Congzhong is switched to low area
Between, middle section and SOC > SOC are in when meeting SOClow3The section Shi Congzhong is switched to high section, is in low section when meeting SOC
And SOC > SOClow2When from low section be switched to middle section, be in high section and SOC < SOC when meeting SOCup2Shi Conggao is cut in section
Change to middle section.k1And k2For charge and discharge clipping control coefrficient (being more than or equal to 1), physical significance is when SOC is in low section
When, maximum charge power is constant, reduce its maximum discharge power so that energy storage device have auxiliary fm capacity meanwhile, it is capable to
Its SOC is restored to middle section；When SOC is in high section, maximum discharge power is constant, reduces its maximum charge power, makes
It obtains energy storage device and has auxiliary fm capacity meanwhile, it is capable to which its SOC is restored to middle section.
Obtaining Pcmd,0Afterwards, auxiliary frequency modulation system time lag is compensated using Smith Predictor, so that system obtains
Better dynamic property is obtained, structure is as shown in Figure 3.Instruct PcmdAcquisition pattern are as follows:
Wherein, s is Laplace operator, KPAnd KIFor the scale parameter and integral parameter of controller, PfeedbackFor containing benefit
Feedback of Power amount is repaid, τ is the auxiliary equivalent time lag of frequency modulation system, and H (s) is auxiliary frequency modulation system transmission function.
By taking energy storage device assists the fired power generating unit frequency modulation frequency modulation of an installed capacity 300MW as an example, simulating, verifying, storage are carried out
It can be configured to 9MW/4.5MWh.Other parameters needed for emulation are listed in table 2.
The value of parameter needed for 2 present invention of table emulates
| Parameter | Value |
| SOClow1,SOCup1 | 0,40% |
| SOClow2,SOCup2 | 50%, 70% |
| SOClow3,SOCup3 | 80%, 100% |
| k1,k2 | 30,15 |
| Pi controller, KP,KI | 0.001,10 |
| H(s) | 1 |
| τ | 3s |
The fired power generating unit frequency modulation frequency modulation simulation result that Fig. 4 assists frequency modulation for no energy storage device and has energy storage device to assist frequency modulation
Comparison diagram, wherein dotted line is AGC instruction in upper figure, solid line is the output of fired power generating unit active power；Dotted line refers in the following figure for AGC
It enables, solid line is that fired power generating unit and energy storage device combine active power output.It can be clearly seen that, using proposed by the invention
After energy storage device assists fired power generating unit frequency modulation frequency modulation control method, fired power generating unit-energy storage device joint response speed, stable state essence
There are apparent improvement in degree and response time compared to simple fired power generating unit.Fig. 5 gives SOC in energy storage device one day and becomes
Change, it can be seen that SOC can in one it is reasonable within the scope of, demonstrate that the present invention is based on the power of energy storage device state-of-charge
The validity of control method.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. the control method and system of energy storage device auxiliary fired power generating unit frequency modulation frequency modulation, which is characterized in that the control system
It is described including the power control module based on energy storage device state-of-charge and the time lag compensation module based on Smith Predictor
Control method includes the following steps:
1) control system described in is instructed by AGC frequency modulation frequency modulation of the data acquisition device receiving from power grid, fired power generating unit is defeated
Active power feedback, energy storage device state-of-charge and active power of output are fed back out, are denoted as P respectivelyAGC, PGEN, SOC, PESS；Root
According to feedback data, control system determines the active power that energy storage needs to export using the method based on energy storage device state-of-charge
Pcmd,0；
2) auxiliary frequency modulation system time lag is compensated using Smith Predictor, control system obtains command power Pcmd, and lead to
It crosses data transmission device and is sent to energy storage device, by energy storage device output order power；The auxiliary frequency modulation system includes control
System processed and energy storage device.
2. control method according to claim 1 and system, which is characterized in that in the step 1), using based on energy storage
The method of device state-of-charge determines the active-power P that energy storage device needs to exportcmd,0Process it is as follows: firstly, obtain wherein
Between power:
Pcmd,1=PAGC-PGEN,
Then, continue to Pcmd,1Using slicing operation, P is obtainedcmd,0, clipping section is related to energy storage device state-of-charge.
3. control method according to claim 1 or 2 and system, which is characterized in that energy storage device state-of-charge to be divided into
Three sections, respectively low section [SOClow1,SOCup1], middle section [SOClow2,SOCup2] and high section [SOClow3,
SOCup3], it is [- P in low section energy storage device active power of output clipping sectionmax,Pmax/k1], it is defeated in middle section energy storage device
Active power clipping section is [- P outmax,Pmax], it is [- P in high section energy storage device active power of output clipping sectionmax/
k2,Pmax]；Wherein, SOClow1<SOCup1<SOClow2<SOCup2<SOClow3<SOCup3For the parameter for judging state-of-charge section,
PmaxFor energy storage maximum charge-discharge electric power, k1For low section charge and discharge clipping control coefrficient, k2For the control of high section charge and discharge clipping
Coefficient.
4. control method according to claim 3 and system, which is characterized in that the k1And k2It is received according to auxiliary frequency modulation
Benefit maximizes target, is optimized using heuritic approach and calculates acquisition.
5. control method according to claim 3 and system, which is characterized in that the control system is in different charged shapes
Hysteresis control method is used when state section switches.
6. control method according to claim 5 and system, which is characterized in that the hysteresis control method are as follows:
Control system default SOC is in middle section, and after auxiliary frequency modulation system starting, control system can be determined in a manner of hysteresis
Section locating for energy storage device SOC ought meet SOC and be in middle section and SOC < SOCup1The section Shi Congzhong is switched to low section, when
Meet SOC and is in middle section and SOC > SOClow3The section Shi Congzhong is switched to high section, when meet SOC be in low section and SOC >
SOClow2When from low section be switched to middle section, be in high section and SOC < SOC when meeting SOCup2During the section Shi Conggao is switched to
Section.
7. control method according to claim 1 or 2 and system, which is characterized in that using Smith Predictor to auxiliary
Frequency modulation system time lag compensates, and obtains the power instruction P to energy storage devicecmd:
Pfeedback=PESS+(Pcmd,0-Pcmd,0e-τs)H(s)
Wherein, s is Laplace operator, KPAnd KIFor the scale parameter and integral parameter of pi controller, PfeedbackFor containing
Feedback of Power amount is compensated, τ is the auxiliary equivalent time lag of frequency modulation system, and H (s) is auxiliary frequency modulation system equivalent transfer function.
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