CN109802446A - Wind bavin based on cloud model stores up hybrid power system electric voltage frequency sliding-mode control - Google Patents
Wind bavin based on cloud model stores up hybrid power system electric voltage frequency sliding-mode control Download PDFInfo
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Abstract
The present invention relates to a kind of, and the wind bavin based on cloud model stores up hybrid power system electric voltage frequency sliding-mode control, the following steps are included: S1, building isolated island wind bavin storage hybrid power system and generator therein, energy-storage system, blower and DSTATCOM founding mathematical models；S2 establishes the state model of system according to the mathematical model established；S3 designs sliding mode controller；Cloud models theory is applied in sliding mode controller by S4, and dynamic adjusts ε value and k value；S5, the controller u (t) obtained according to step S4 optimize the LOAD FREQUENCY deviation of electric system as control instruction.Compared with prior art, energy-storage system participates in system frequency adjusting in the present invention, and participates in system voltage using DSTATCOM and adjust, and guarantees the power-balance of system, to effectively reduce voltage and frequency departure in system.
Description
Technical field
The present invention relates to hybrid power system voltages and frequency control field, more particularly, to a kind of wind based on cloud model
Bavin stores up hybrid power system electric voltage frequency sliding-mode control.
Background technique
Voltage and frequency are to reflect two important indicators of safe and stable operation of power system, and electric system is operating normally
In the case of, voltage control is mainly adjusted by reactive power in system and completes, and frequency control mainly passes through having for regulator generator
Function power is completed.
Wind energy is a kind of inexhaustible clean reproducible energy, receives the pass of extensive scholar and expert
Note, specific gravity shared by wind-power electricity generation amount are also increasing year by year, the electricity generation system of wind bavin complementation wind energy abundance remote mountain areas with
The areas such as island can provide effective electric energy supply.But wind energy has intermittent and randomness, can generate disturbing influence system
Voltage and frequency stabilization.In order to guarantee the power quality of system, need to make active power and reactive power in system to reach
Balance.
With the continuous development of energy storage technology and the reduction of cost, more and more energy-storage systems, which are linked into power grid, to be used
To be optimized to the frequency fluctuation of electric system.While in order to improve power quality, flexible ac transmission technology (flexible
AC transmission systems, FACTS) it is constantly progressive along with the fast development of power electronic technique, it is power train
Voltage fluctuation provides reliable optimization method in system.DSTATCOM is a kind of novel FACTS device in parallel, can be by electricity
Net Dynamic injection perception or capacitive reactive power quickly inhibit voltage fluctuation, to maintain system voltage to stablize.
For isolated island wind bavin hybrid power system voltage and frequency stability problem, many scholars to being ground in this respect
Study carefully.Document stablizes shunt capacitance double-fed blower to voltage deviation in system.But the above method is for voltage
Adjustment capability has certain limitations.Therefore FACTS device appropriate is needed to configure.Reactive power compensator is installed in new-energy grid-connected point
It is the most common means for maintaining grid entry point voltage stabilization.Output characteristics that document combination DSTATCOM is idle proposes to be based on slope tune
The reactive voltage control method for coordinating of section.Document dynamically adjusts the control that multiple domain electric system obtains frequency using cloud models theory
Device parameter, document are designed controller using particle swarm algorithm and adaptive Dynamic Programming so that system frequency have compared with
High stability.But it when load disturbance is larger higher with wind energy permeability in system, is constrained by conventional electric generators Generation Rate
Limitation, steam turbine can only be acted on by control algolithm, cannot effectively maintain the frequency stabilization of electric system.Therefore it needs
Energy storage device appropriate is configured to coordinate LOAD FREQUENCY control and optimize to frequency.
Sliding formwork control has fast response time, has to Parameter Perturbation and external interference as typical nonlinear Control
Insensitivity has very strong robustness.And algorithm is simple, is easy to Project Realization, therefore be widely used in electric system.Cloud
Model theory has been evolving by gradual application as important expression way a kind of in artificial intelligence with uncertainty
In scientific research.Cloud model is the uncertain modulus of conversion indicated between some qualitativing concept and its quantitative concept with Linguistic Value
Type, it organically combines the randomness in the ambiguity and probability theory in fuzzy set theory, constitute qualitative and quantitative it
Between mapping.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of based on cloud model
Wind bavin stores up hybrid power system electric voltage frequency sliding-mode control, all joined to energy-storage system, generator and DSTATCOM
Control, to achieve the purpose that maintain system voltage and frequency stabilization.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of wind bavin storage hybrid power system electric voltage frequency sliding-mode control based on cloud model, comprising the following steps:
S1, building isolated island wind bavin storage hybrid power system and generator therein, energy-storage system, blower and DSTATCOM are built
Vertical mathematical model；
S2 establishes the state model of system according to the mathematical model established:
Wherein, x (t) is state variable matrix, and A, B are system parameter matrix, and u (t) is sliding mode controller output matrix, g
(x, t) is the indeterminate of system parameter；
S3, design sliding mode controller are as follows:
U (t)=- (DB)-1[DAx(t)+Dβ+εsign(γ)+kγ]
Wherein, D is the constant matrices that can make matrix D B nonsingular matrix, and enabling β for convenience of design is g (x, t) i.e. system
The indeterminate of parameter, ε > 0, k > 0, sign (*) are sign function, and γ is the sliding-mode surface of design, γ=Dx；
Cloud models theory is applied in sliding mode controller by S4, and dynamic adjusts ε value and k value；
S5, the controller u (t) obtained according to step S4 optimize the LOAD FREQUENCY deviation of electric system as control instruction.
In the step S1, frequency adjusting is carried out using energy-storage system auxiliary generator.
In the step S1, system voltage is adjusted using DSTATCOM, thus voltage and frequency in reduction system
Rate deviation.
In the step S1, sliding mode controller will control signal function in energy-storage system, generator and DSTATCOM,
To maintain the stabilization of system voltage and frequency.
In the step S3, utilization index type tendency rate designs sliding-mode surface:
In the step S4, | γ | when being more than setting value, increase ε value and k value, to increase the speed of approach diverter surface
Degree, when near diverter surface | γ | it is less than setting value, reduces ε value and k value at this time to guarantee faster velocity of approach and reduce to tremble
Vibration.
Compared with prior art, the invention has the following advantages that
(1) using energy-storage system, quickly and accurately responding ability, auxiliary generator carry out system frequency adjusting, use
DSTATCOM carries out voltage adjustment.And it is traditional additional sliding formwork control is added to generator on the basis of, to energy-storage system with
And DSTATCOM also joined additional sliding formwork control.
(2) use cloud models theory, the characteristics of according to sliding formwork control, when apart from diverter surface farther out, select in tendency rate
Biggish ε and k value is taken, to increase the speed of approach diverter surface, when near diverter surface, it is faster to guarantee to reduce ε and k at this time
Velocity of approach simultaneously reduces buffeting, so that control system has better dynamic property.
(3) the isolated island wind bavin electric system of additional sliding formwork control only is added to generator and without energy-storage system phase with traditional
Than cloud sliding formwork control reduces the offset of system voltage and frequency under disturbance, guarantees power system stability and rings faster
Answer speed.In a certain range, when load disturbance increases, cloud sliding mode controller has better control performance to this system.
Detailed description of the invention
Fig. 1 is isolated island wind bavin hybrid power system structure chart of the present embodiment with energy storage；
Fig. 2 is the present embodiment wind generator system transfer function model；
Fig. 3 is the transfer function model of the present embodiment synchronous generator；
Fig. 4 is the transfer function model of the present embodiment energy-storage system and DSTATCOM and control system；
Fig. 5 is the present embodiment DSTATCOM physical model；
Fig. 6 is the present embodiment cloud controller structure chart；
Fig. 7 (a) is that the present embodiment inputs membership clouds parameter；
Fig. 7 (b) is that the present embodiment exports membership clouds parameter；
Fig. 8 is the present embodiment cloud model sliding mode controller structure chart；
Fig. 9 (a) is bent for the system busbar voltage change dynamic response of system under step disturbance in the case of the present embodiment example 1
Line；
Fig. 9 (b) changes dynamic response song for the system busbar frequency of system under step disturbance in the case of the present embodiment example 1
Line；
Figure 10 (a) is the system busbar voltage change dynamic response of system under step disturbance in the case of the present embodiment example 2
Curve；
Figure 10 (b) changes dynamic response for the system busbar frequency of system under step disturbance in the case of the present embodiment example 2
Curve；
Figure 11 (a) is the random perturbation of load or burden without work in system；
Figure 11 (b) is the mechanical output of system blower output；
Figure 11 (c) is the random perturbation of burden with power in system；
Figure 11 (d) is the electromagnetic power of system blower output；
Figure 12 (a) is the system busbar voltage change dynamic response of system under random perturbation in the case of the present embodiment example 3
Curve；
Figure 12 (b) is the system frequency voltage change dynamic response of system under random perturbation in the case of the present embodiment example 3
Curve.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
Hybrid power system is stored up for isolated island wind bavin as shown in Figure 1, in order to reduce due to wind energy fluctuation and load fluctuation
Caused by system voltage and frequency departure, propose to energy-storage system, generator and DSTATCOM add cloud sliding formwork control
Device reduces the voltage of system and the control algolithm of frequency disturbance.The present invention goes out the voltage frequency of hybrid power system to isolated island wind bavin
Rate control the following steps are included:
S1 constructs the mathematical model of system:
It is flat based on active reactive of the small-signal analysis method to the wind bavin storage hybrid power system under island mode according to Fig. 1
Weighing apparatus problem is studied, and the active power of hybrid power system and reactive power equilibrium equation are respectively as follows: under frequency domain
ΔPIG(s)+ΔPSG(s)+ΔPBESS(s)=Δ PL(s)
ΔQIG(s)+ΔQSG(s)+ΔQCOM(s)=Δ QL(s)
In formula: Δ PIG(s) be influence generator generate active variable quantity, Δ PSGIt (s) is having for synchronous generator generation
Function variable quantity, Δ PBESS(s) be energy-storage system issue active power, Δ PL(s) be load consumption active variable quantity；ΔQIG
(s) be influence generator absorb reactive power variable quantity, Δ QSG(s) be synchronous generator generate idle work variable quantity, Δ QCOM
(s) be DSTATCOM generate reactive power, Δ QL(s) be load consumption idle work variable quantity.
When system frequency variation is Δ f, the active power balance equation of system are as follows:
When system voltage variation is Δ U, the reactive power equilibrium equation of system are as follows:
In formula: KP、TP、KVAnd TVIt is the time constant of power-balance link.
It can obtain according to fig. 2: the pneumatic power variation delta P of blower capturew(s) are as follows:
In formula: VwBe wind speed variable quantity: ρ is atmospheric density；R is Wind wheel paddle radius；CP(λ, β) is power coefficient,
β is propeller pitch angle；Tip speed ratio isω is turbo blade angular speed, be can be obtained by following formula:
In formula: J is equivalent total rotary inertia of system, PgFor the mechanical output of blower output.
The blower being connected with generator is much larger than the rotary inertia of generator due to rotary inertia, it is possible to ignore power generation
Machine transient process, the then output power of generator are as follows:
In formula: U is system busbar voltage；R1For stator resistance；R2For rotor resistance；X1For stator reactance；X2For rotor electricity
It is anti-；Revolutional slip isω0For synchronous angular velocity.
When considering generator voltage and parameter, the reactive power variable quantity of influence generator absorption are as follows:
ΔQIG(s)=K5ΔU(s)+K8ΔPW(s)
Req=R1+R2,Xeq=X1+X2
Wherein, Δ U (s) is system voltage variable quantity.
It can be obtained by Fig. 3: the active variable quantity of synchronous generator are as follows:
In formula: Δ PvIt (s) is throttle position increment, X is rate adaptation caused by governor acts, TchWhen for steam turbine
Between constant, TgFor governor time constant, KI1For integration control gain
Under microvariations, the idle work variable quantity of synchronous generator are as follows:
ΔQSG(s)=K1ΔE'q(s)+K2ΔU(s)
In formula: Δ E'qFor the transient potential variable quantity of synchronous generator armature under a transient condition；δ is synchronous generator
Power angle between inner armature electromotive force and port voltage；XdAnd X'dThe respectively d-axis of synchronous generator stable state and transient state electricity
It is anti-, Δ E'qIt is directly proportional to d-axis magnetic linkage variable quantity under transient condition, it indicates are as follows:
(1+sTG)ΔE'q(s)=K3ΔEfd(s)+K4ΔU(s)
In formula: Δ EfdIt (s) is the variable quantity of field regulator voltage, T'doWhen opening a way for synchronous generator d-axis when transient state
Between constant.
Excitation system uses IEEE type-1 model, ignores the saturation function of system, transmission function is as follows:
In formula: KE、KA、KFRespectively excitation, the gain of stabilizer, amplifier, TE、TA、TFRespectively excitation, stabilizer,
The time constant of amplifier, Δ UaIt (s) is the variable quantity of amplifier output, Δ UfIt (s) is excitation feedback voltage, Δ Uref(s) it is
The reference voltage variable quantity of setting.
Battery energy storage system is used as auxiliary frequency modulation, and main function is to exchange active power with power grid by current transformer.This
Invention cooperates synchronous generator that hybrid power system is made to reach active balance by energy-storage system, and is equipped with DSTATCOM to realize
Reactive balance is adjusted with the active power and reactive power that achieve the purpose that system entirety.In figures 4 and 5, T in figureBESSFor
The time constant of power conversion system, KBFor the unit power regulation coefficient of energy-storage system, wherein Δ α is the variation for exporting phase angle
Amount, TaFor IGBT group delay time, TdFor thyristor average dead time time, KP2、KI2For pi regulator gain, VdcFor
Capacitive side voltage in DSTATCOM, B are that transformer exports susceptance, and k is constant, and p is inverter umber of pulse, and U is system busbar electricity
Pressure.The idle output variable quantity of DSTATCOM are as follows:
ΔQCOM(s)=K7ΔU(s)+K8Δα(s)
K7=-kVdcBcosα,K8=kVdcUBsinα
In Fig. 4, by being acquired to state variable each in system, state variable is then input to cloud sliding formwork control
In device, output u1, u2 and u3 of controller are obtained, is entered into two models to improve to system performance.
S2 establishes the state model of system according to the mathematical model established:
When system operating point changes, the parameter of system also changes therewith, so that generation system parameter is not true
It is qualitative.Therefore it can be extended on comprising Parameter uncertainties and the system model for meeting interference:
Wherein Δ A, Δ B and Δ H are the indeterminate of parameter.
For convenience of sliding mode controller design, indeterminate is defined:
G (x, t)=Δ Ax (t)+Δ Bu (t)+(H+ Δ H) w (t)
Then system can indicate are as follows:
S3 designs following sliding-mode surface according to above-mentioned state-space model:
γ=Dx
Utilization index type tendency rate:
To design sliding mode controller.Wherein ε > 0, k > 0, sign (*) are sign function.The sliding mode controller of design is such as
Under:
U=- (DB)-1[DAx+Dβ+εsign(γ)+kγ]
Cloud models theory is applied in sliding mode controller by S4, carrys out ε the and k value of dynamic adjustment index tendency rate, | γ |
When larger, biggish ε and k value is chosen, to increase the speed of approach diverter surface, when near diverter surface | γ | it is smaller, it answers at this time
Reduce ε and k to guarantee faster velocity of approach and reduce buffeting.Sliding mode controller is optimized, the dynamic for improving system is steady
It is qualitative.
S5, the controller u obtained according to step S3 and S4i(t) it is used as control instruction, optimizes the LOAD FREQUENCY of electric system
Deviation.
Isolated island wind bavin storage hybrid power system of the present invention is mainly embodied by FIG. 1 to FIG. 5.Fig. 1 is the isolated island wind bavin with energy storage
Hybrid power system structure chart, Fig. 2 are the transfer function model that wind generator system is given, and Fig. 3 is the transmitting letter of synchronous generator
Exponential model, Fig. 4 are energy-storage system and DSTATCOM and its control system transfer function model, and Fig. 5 is DSTATCOM physical model.
In the present invention, energy-storage system takes part in the adjusting of system frequency.In the case where frequency fluctuation is small, energy-storage system and
When more generators participate in frequency adjusting jointly, so that the increment of every generated output power averagely reduces, to make load
Frequency adjusting is more easier and by system frequency undulated control in lesser range.In the biggish situation of frequency fluctuation, storage
With maximum power output, every generator increases generator amount according to a certain percentage, achievees the purpose that frequency modulation energy system.Subtract in this way
The participation for having lacked thermoelectric generator frequency modulation frequency modulation becomes easy frequency adjusting.In severe case, the system also reduced is got rid of negative
The probability of lotus, to improve the reliability of Operation of Electric Systems.
The present invention is that effectively, the cloud sliding mode controller of design can incite somebody to action to the electric voltage frequency control of isolated island hybrid power system
System voltage and frequency control are in the even more small range of the permission of national regulation.It can be later system voltage frequency controlling party
Certain basis is established in the research in face.
(1) mathematical model of isolated island wind bavin storage hybrid power system
The isolated island wind bavin storage hybrid power system that the present invention is studied, comprising wind generator system, diesel generating system, bears
Lotus, reactive power compensator DSTATCOM and energy-storage system.According to Fig. 4, state space side is established to the mathematical model set up
Journey:
Wherein state variable and each matrix are respectively as follows:
X (t)=[Δ f Δ Pm ΔPv ΔE ΔPBESS Δα Δα1 Δα2]T
U (t)=[u1 u2 u3]T
W (t)=[w1 w2]T
Wherein: w1=Δ PIG+ΔPL, w2=Δ Uref+ΔU
Wherein, KBEFor the unit power regulation coefficient of energy-storage system, TBEFor the time constant of power conversion system, when being
When system operating point changes, the parameter of system also changes therewith, thus generation system parameter uncertainty.Therefore above formula
It can be extended to comprising Parameter uncertainties and the system model for meeting interference:
Wherein Δ A, Δ B and Δ H are the indeterminate of parameter.
For convenience of sliding mode controller design, indeterminate is defined:
G (x, t)=Δ Ax (t)+Δ Bu (t)+(H+ Δ H) w (t)
Then system can indicate are as follows:
(2) isolated island wind bavin storage hybrid power system voltage of the present invention and frequency controller design principle
Assuming that 1: there is known positive function β (x, t), so that | | g (x, t) | |≤β (x, t), | | * | | indicate Euclid
Norm.
Assuming that 2: sytem matrix (A, B) is controllable.
For sliding mode controller design, it is designed primarily with respect to diverter surface and control rate.So that related control
Device can reach diverter surface from arbitrary initial value and be maintained near sliding mode.
For the system model that the present invention is studied, sliding-mode surface γ can be designed are as follows:
γ=Dx
Wherein, matrix D is the constant matrices that can make matrix D B nonsingular matrix.
γ (t)=0 when system enters sliding mode, so following equivalence control devices can be obtained by γ (t)=0 and formula
ueq:
ueq=-(DB)-1[DAx+Dg(x,t)]
Then substituting the above to can obtain:
For the ease of design, definition
Then above formula is writeable are as follows:
If theorem 1 assumes that 1 and 2 set up, when system state variables meetSystem is in sliding-mode surface
Upper holding is stablized.
It proves: construction liapunov function:
It can obtain:
WhereinFor Lyapunov EquationSolution.For given positive definite matrixIt can conclude are as follows:
So when system state variables meetAndWhen,It ensure that system
Stablize on sliding-mode surface s (t)=0.
Utilization index type tendency rate:
To design sliding mode controller.Wherein ε > 0, k > 0, sign (*) are sign function.
Theorem 2: design sliding mode controller meets following equations:
U=- (DB)-1[DAx+Dβ+εsign(γ)+kγ]
Then system meets reaching condition.
It proves: since system meets assumed condition, so can obtain:
SoI.e. system meets reaching condition.
In exponential type tendency rate, ε and k are usually chosen by experience.In order to obtain faster velocity of approach and more simultaneously
Small buffeting usually increases ε and k in approach movement, reduces ε and k in sliding mode movement.It is found that | γ | when larger,
Biggish ε and k value is chosen, to increase the speed of approach diverter surface, when near diverter surface | γ | it is smaller, ε and k should be reduced at this time
To guarantee faster velocity of approach and reduce buffeting.
Cloud Model Controller is as shown in fig. 6, wherein domain range is between (- 1,1) in cloud controller, so Selecting All Parameters
Two quantization parameters of p and parameter q, by the γ of the input and ε of outputnQuantified.γ after quantization is input to cloud control
Device former piece generates one group of random μi, then by these μiIt is input to the consequent of cloud controller, generates corresponding water dust drop (xi,
μi), these water dusts by weighted average or are input to generation control output valve in reverse cloud.In cloud controller, respectively it is subordinate to
Cloud parameter is as shown in Figure 7.For the electric system that the present invention is studied, blower output power and load power will receive
The disturbance such as variation.In the treatment process of fuzzy set, what the degree of membership of any on domain was not constant between, there is subtle
Variation.Cloud has certain shapes on the whole it can be seen from Fig. 7 and Fig. 8, embodies its qualitative concept, but it is practical it
It is the point diagram for the random distribution being made of many water dusts, does not have specific boundary, embody the ambiguity of cloud.Cloud models theory
By its ambiguity and randomness, the uncertainty of system is inherited.Using the rule of table 1, by with ambiguity
ε is exported with the cloud controller of randomnessn, realize and achieve the purpose that dynamic adjusts tendency rate parameter according to γ.Fig. 8 is cloud model
The structure chart of sliding mode controller.
1 cloud model numerical characteristic of table
2 hybrid power system capacity parameter of table
| Capacity | Numerical value |
| Reference capacity | 2.5MW |
| Fan capacity | 1.5MW |
| Diesel capacity | 1.5MW |
| Load capacity | 2.5MW |
3 SG of table, IG, excitation system and load parameter
4 DSTATCOM of table and energy-storage system parameter
| DSTATCOM | Energy-storage system |
| Td=0.001667 | KBE=-3 |
| Ta=0.00025 | TBE=0.2 |
(3) sample calculation analysis
For the cloud sliding formwork control designed in the verifying present invention energy-storage system auxiliary generator frequency modulation and DSTATCOM pressure regulation
Device processed stores up the validity of hybrid power system voltage and frequency control to isolated island wind bavin, the present invention is based on matlab emulation platform,
Isolated island wind bavin storage hybrid power system model and corresponding sliding formwork control simulation model are built.For the electric power of isolated operation
In system, different wind energies are considered respectively and different load disturbs the robustness problem of lower additional controller.The mixing studied
Blower installed capacity is 1.5MW, diesel capacity 1.5MW, load capacity 2.5MW in electric system.System parameter is attached
Record provides.
1) example 1
The present invention is on the basis of the LOAD FREQUENCY control that original sliding formwork participates in, for energy-storage system and DSTATCOM
It has been separately added into a sliding formwork control.Under identical nominal parameters, the active and idle of step is added in systems and disturbs
Dynamic, in t=0.004s, load or burden without work changes Δ QL=0.01pu, the pneumatic power Δ P of blower capturew=0.1pu；In t=
When 0.2s, burden with power changes Δ PL=0.7pu, blower active power of output changes delta PIG=0.2pu.
System does not add DSTATCOM when 0.004s generates an idle step disturbance it can be seen from Fig. 9 (a)
Enter sliding formwork control to be added compared with sliding formwork control with to DSTATCOM, under sliding formwork control assists the overshoot of DSTATCOM obvious
Drop, and the transit time of sliding formwork control auxiliary DSTATCOM is also obviously shortened.System is generated in 0.2s it can be seen from Fig. 9 (b)
When one active step disturbance, sliding formwork control is not added to energy-storage system and is added compared with sliding formwork control with to energy-storage system,
Sliding formwork control participates in the overshoot that energy-storage system is controlled and is also decreased obviously, and the transit time of frequency also slightly shortens.Therefore
Sliding formwork control, which is added, to DSTATCOM and energy-storage system can be improved the voltage of system and the stability of frequency.
2) example 2
On the basis of traditional sliding formwork control, present invention adds cloud controllers to optimize sliding mode controller, so that
Control effect is improved.Under nominal parameters, the active and reactive disturbance of a step is added in systems, in t=
When 0.004s, load or burden without work changes Δ QL=0.01pu, the pneumatic power Δ P of blower capturew=0.1pu；In t=0.2s, have
Workload changes Δ PL=0.7pu, blower active power of output changes delta PIG=0.2pu.
When 0.004s generates an idle step disturbance, cloud sliding formwork control relatively passes system it can be seen from Figure 10 (a)
The overshoot for sliding formwork control of uniting slightly reduces, and voltage variety has faster transit time under cloud sliding formwork control.By Figure 10
(b) as can be seen that system is when 0.2s generates an active step disturbance, the overshoot of the more traditional sliding formwork control of cloud sliding formwork control
Amount also has certain reduction, and cloud sliding formwork control lower frequency variable quantity has faster transit time.Therefore it can further improve and be
The stability of system voltage and frequency.
3) example 3
Actual blower output power and load be it is continually changing, in order to make to emulate closer to actual conditions, this programme
Random disturbance signal is added to isolated island wind bavin storage hybrid system, verifying to energy-storage system and DSTATCOM be added cloud sliding formwork control and
The robustness of traditional sliding formwork control, Figure 11 are each random perturbation change curve, and Figure 12 is isolated island wind bavin storage mixing under random perturbation
The dynamic response of system.
Figure 11 (a) is the random perturbation of load or burden without work in system, and Figure 11 (b) is the mechanical output of system blower output,
Figure 11 (c) is the random perturbation of burden with power in system, and Figure 11 (d) is the electromagnetic power of system blower output.From Figure 12 (a)
As can be seen that the overshoot of the voltage variety of the more traditional sliding formwork control of cloud sliding formwork control slightly reduces.It can from Figure 12 (b)
Out, the more traditional sliding formwork control of cloud sliding formwork control, faster, overshoot is smaller for system frequency resume speed.Embody cloud sliding formwork control
Device has certain superiority to system voltage and frequency stabilization.
Claims (6)
1. a kind of wind bavin based on cloud model stores up hybrid power system electric voltage frequency sliding-mode control, which is characterized in that including
Following steps:
S1, building isolated island wind bavin storage hybrid power system and generator therein, energy-storage system, blower and DSTATCOM establish number
Learn model；
S2 establishes the state model of system according to the mathematical model established:
Wherein, x (t) be state variable matrix, A, B be system parameter matrix, u (t) be sliding mode controller output matrix, g (x,
It t) is the indeterminate of system parameter；
S3, design sliding mode controller are as follows:
U (t)=- (DB)-1[DAx(t)+Dβ+εsign(γ)+kγ]
Wherein, D is the constant matrices that can make matrix D B nonsingular matrix, β=g (x, t) i.e. indeterminate of system parameter, ε
> 0, k > 0, sign (*) are sign function, and γ is the sliding-mode surface of design, γ=Dx；
Cloud models theory is applied in sliding mode controller by S4, and dynamic adjusts ε value and k value；
S5, the controller u (t) obtained according to step S4 optimize the LOAD FREQUENCY deviation of electric system as control instruction.
2. a kind of wind bavin based on cloud model according to claim 1 stores up hybrid power system electric voltage frequency sliding formwork control side
Method, which is characterized in that in the step S1, frequency adjusting is carried out using energy-storage system auxiliary generator.
3. a kind of wind bavin based on cloud model according to claim 1 stores up hybrid power system electric voltage frequency sliding formwork control side
Method, which is characterized in that in the step S1, system voltage is adjusted using DSTATCOM, thus electric in reduction system
Pressure and frequency departure.
4. a kind of wind bavin based on cloud model according to claim 1 stores up hybrid power system electric voltage frequency sliding formwork control side
Method, which is characterized in that in the step S1, sliding mode controller will control signal function in energy-storage system, generator and
DSTATCOM, to maintain the stabilization of system voltage and frequency.
5. a kind of wind bavin based on cloud model according to claim 1 stores up hybrid power system electric voltage frequency sliding formwork control side
Method, which is characterized in that in the step S3, utilization index type tendency rate designs sliding-mode surface:
6. a kind of wind bavin based on cloud model according to claim 1 stores up hybrid power system electric voltage frequency sliding formwork control side
Method, which is characterized in that in the step S4, | γ | when being more than setting value, increase ε value and k value, to increase approach diverter surface
Speed, when near diverter surface | γ | be less than setting value, reduce ε value and k value at this time to guarantee faster velocity of approach and subtract
Small buffeting.
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| CN112072679A (en) * | 2020-09-14 | 2020-12-11 | 长沙理工大学 | Source network load storage coordination optimization method considering flexible active power constraint |
| CN113346547A (en) * | 2021-06-28 | 2021-09-03 | 重庆大学 | Wind power plant energy storage power supply consistency control method based on sliding mode control |
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