CN114326398A - Control method and control system of linear switching system with unstable mode - Google Patents
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Abstract
The invention discloses a control method and a control system of a linear switching system with an unstable mode, which comprises the following steps: constructing a linear switching system model with interference terms: constructing a controller model: Uj≤μiUi,Ui>0, i, j belongs to gamma, i is not equal to j; initialization model setting parameter mui>1,Solving the controller model to obtain the gainCollecting the current sampling time tkInner system state x (t)k) And the mode σ (t) activatedk) Updating the input signal according to the sampling informationWherein the content of the first and second substances,is the gain KiNeutralization of the activated modality σ (t)k) The corresponding gain. But this application is through considering steady mode and unstable mode simultaneously when the model is founded, solves the gain of controller model, updates switching system's control data according to the gain of solving, in this application, through setting up reasonable controller, can improve the stability of system input state.
Description
Technical Field
The invention belongs to the technical field of linear switching system control, and particularly relates to a control method and a control system of a linear switching system with an unstable mode.
Background
Due to the particularity of the switching systems, many switching systems have unstable modes, and due to the rapid development of networks, the control of the switching systems through network connection controllers is a current hotspot method. However, due to the instability of the network and the complexity of the switching, the input state of the switching system may be unstable, and especially when the system is under a denial of service attack, it is difficult for the system to maintain the input state stable.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, the present invention provides a control method and a control system for a linear switching system with unstable mode, which aims to improve the stability of the input signal of the linear switching system with unstable mode.
To achieve the above object, according to an aspect of the present invention, there is provided a control method of a linear switching system with unstable mode, comprising:
construction beltLinear switching system model with interference term: where x (t) is the system state, u (t) is the input signal, d (t) is the unknown bounded interference, σ (t) is the mode activated at time t, Aσ(t)、Bσ(t)、Dσ(t)Are respectively a weighting matrix Ai、Bi、DiIn the weighting matrix corresponding to the activated mode σ (t), i ∈ Γ ═ { 1., N }, N is the total number of modes of the system, where r stable modes are ΓsR, N-r unstable modes are Γu={r,...N};
Constructing a controller model:Uj≤μiUi,Ui>0,i,j∈Γ,i≠j,Ui、Tifor the model to be parameterized, λi、μiSetting parameters for the model;
Collecting the current sampling time tkSystem state x (t)k) And the mode σ (t) activatedk) Updating the input signal according to the sampling informationWherein the content of the first and second substances,is the gain KiNeutralization of the activated modality σ (t)k) The corresponding gain.
In one embodiment, the control method further includes optimally selecting a sampling interval Δ:
wherein the content of the first and second substances,
κi=max{||Ai+BiKi||,||Di||},κij=max{||Aj+BjKi||,||Dj| l }, ε satisfies:wherein ω is1i=λiλmin(Pi),ω2i=||2PiBiKi||。
In one embodiment, the control method further comprises optimizing the switching signal:
constructing a switching model:
wherein n isi(T, T) is the ith mode at [ T, T]Number of activations, Ti(T, T) is the ith mode at [ T, T]Total duration of inner, τaiIs the modality-dependent mean residence time, T, of the ith modality+(T, T) is all unstable modes in [ T, T ]]Total duration of inner, τ+Is that all unstable modes have a duration of [ T, T ]]Mean time of day, τ+>1,n0iAnd χ is a compensation parameter;
constructing a switching constraint condition:
wherein the content of the first and second substances,
obtaining tau in switching model according to switching constraint condition+And τaiAnd determining a switching signal.
In one embodiment, the control method further comprises evaluating the stability of the system according to the maximum blocking rate that the linear switching system can tolerate and the blocking rate suffered by the current linear switching system:
constructing a denial of service attack model:
wherein n (T, T) is a denial of service attack at [ T, T]Inner number of activations, | xi (T, T) | is denial of service attack [ T, T |)]Total duration of inner, τDIs the average residence time, T, of a denial of service attack*Is a denial of service attack at T, T]Mean time ratio of (T)*Greater than 1, eta and kappa are compensation parameters;
calculating the maximum blocking rate which can be tolerated by the linear switching system:
Judging whether the blocking rate F' suffered by the current linear switching system is smaller than the maximum blocking rate F which can be tolerated by the linear switching system, if so, indicating that the input state of the current linear switching system is stable, and if not, indicating that the input state of the current linear switching system is unstable.
In one embodiment, it is determined whether the current blocking rate F' suffered by the linear switching system is less than the maximum blocking rate F that the linear switching system can tolerate, and if not, the system parameters are adjusted in a reverse direction to increase the maximum blocking rate F that the linear switching system can tolerate.
In one embodiment, χ ≧ 0, η ≧ 0, κ ≧ 0.
In one embodiment, the controller model is solved by the matlab toolbox.
According to another aspect of the present invention, there is provided a control architecture for a linear switching system with unstable modes, comprising:
the switching system is used for switching different modes according to the switching signal, and the switching system is provided with a stable mode and an unstable mode;
a sampler for acquiring a current sampling time t according to a sampling sequencekSystem state x (t)k) And the mode σ (t) activatedk) And transmitted to the controller through the communication network;
a controller for acquiring the sampling signal of the sampler and processing to obtain a control signalAnd transmits the control signal to the holder through a communication network, wherein,a gain determined for the control method according to the linear switching system with unstable mode described above;
the retainer is used for acquiring a control signal of the controller and continuously outputting the control signal to the actuator;
and the actuator is used for acquiring the control signal of the retainer and inputting the control signal into the switching system to update the system input signal.
In one embodiment, the sampler is set with a sampling interval Δ, which is determined according to the control method of the linear switching system with unstable mode described above.
In one embodiment, the switching signal is a switching signal determined according to the control method of the linear switching system with unstable mode described above.
This application is through constructing linear switching system model to construct the controller model based on linear switching system model, but consider steady mode and unstability mode simultaneously when constructing the model, and set for different initialization parameters to different modes, solve the gain of controller model, update switching system's control data according to the gain of solving, in this application, through setting up reasonable controller, can improve system input state's stability. Furthermore, on the basis of setting a reasonable controller, the sampling time interval and the switching signal are further optimized, and the stability of the input state of the system can be further improved by setting the reasonable controller, the sampling time interval and the switching signal. Furthermore, considering the denial of service attack, a denial of service attack model is constructed, the blocking rate suffered by the system and the maximum blocking rate which can be tolerated by the system are compared, the stability of the system can be evaluated, meanwhile, the maximum blocking rate which can be tolerated by the system can be improved by adjusting system parameters, and the stability of the input state of the system is further improved.
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FIG. 1 is a block diagram of a control architecture of a switching system according to an embodiment of the present application;
FIG. 2 is a flow chart illustrating the steps of a method for controlling a linear switching system with unstable modes according to an embodiment of the present application;
fig. 3 is a flowchart illustrating steps of a method for controlling a linear switching system with unstable mode according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to facilitate understanding of the present invention, a linear switching system control system is first operatedAnd (4) explanation. Fig. 1 is a schematic diagram of a switching system control system in an embodiment, which includes a switching system, a sampler, a controller, a keeper and an actuator forming a closed-loop control, wherein the switching system has N modes, and a set of the modes is denoted as Γ ═ 1.·, N }, wherein a part of the modes is a stable mode and a part of the modes is an unstable mode, for example, r stable modes, N-r unstable modes, and a set of the stable modes is denoted as ΓsR, the unstable mode is denoted as ΓuN }. When the switching system is determined, the modality is determined. During the operation of the system, the switching system switches from one mode to another mode according to the set switching signal, and the mode which is successfully switched is activated, namely an activation mode sigma (t)k),σ(tk) E Γ ═ { 1.·, N }, operated by the activation mode. During the period, the sampler samples the switching system according to the set sampling sequence to obtain the current sampling time tkSystem state x (t)k) And the mode σ (t) activatedk) And transmitted to the controller through the communication network, wherein, a fixed sampling interval is arranged between two adjacent samplings. The controller receives the sampling information of the sampler through the communication network and processes the sampling information to obtain a control signalWherein the content of the first and second substances,for the controller with the current active mode σ (t)k) The corresponding gain factor. The controller transmits the control signal to the retainer through the communication network, and the retainer continuously outputs the control signal to the actuator within a preset time length. After the actuator receives the control signal, the control signal is input into the switching system to update the input signal of the system.
In the control system, the design of the controller, the selection of the sampling time interval and the setting of the switching signal can all influence the stability of the input signal of the switching system, and because the controller is accessed into the system through a communication network, the stability of the input signal of the switching system can also be influenced by network attack.
Based on this, the present application provides a control method for a linear switching system with unstable mode, as shown in fig. 2, in an embodiment, the control method includes:
step S100: and optimizing the design of the controller.
Specifically, the design process of the optimization controller is as follows:
where x (t) is the system state, u (t) is the input signal, and d (t) is the unknown bounded interference. Wherein, the parameter representing the system state can be flexibly selected according to the requirement. σ (t) is the modality activated at time t, Aσ(t)、Bσ(t)、Dσ(t)Are respectively a weighting matrix Ai、Bi、DiIn a weighting matrix corresponding to the activated modality σ (t), Ai、Bi、DiIs a weighting matrix of the ith mode, i is equal to Γ ═ 1.. and N is the total mode number of the system, wherein r stable modes are ΓsR, N-r unstable modes are ΓuN }. Wherein the weighting matrix Ai、Bi、DiAfter the switching system is determined, the switching system can be determined according to the system parameters and is a known parameter. In model proposal, it is assumed that the state of the system does not jump at all switching moments.
Step S120: constructing a controller model:Uj≤μiUi,Ui>0,i,j∈Γ,i≠j,Ui、Tifor the model to be parameterized, λi、μiParameters are set for the model.
Wherein the content of the first and second substances,respectively, represent transpose matrices of the corresponding matrices.
Step S130: initialization model setting parameter mui>1,Solving the controller model to obtain a gain Ki=TiPi,
Wherein the content of the first and second substances,representation matrix UiThe inverse matrix of (c).Denotes when i e rsWhen is lambdai>0,Denotes when i e ruWhen is lambdai<0。
Specifically, the initialization model setting parameters are set according to certain conditions, and the model setting parameters can be flexibly set as long as the constraint conditions are met. In the application, when the setting parameters are initialized, the different modes correspond to the setting parameters with different conditions, and the two situations of a stable state and an unstable state are comprehensively considered during the design of the controller, so that the stability of the input signals of the switching system can be improved. It is understood that the range of solutions can be obtained by solving the inequality, and one solution can be arbitrarily selected from the range. Specifically, the matlab toolbox can be used for solving the model by the gain KiAnd when the matlab tool box is used for solving, an optimal solution can be automatically output.
Step S140: collecting the current sampling time tkSystem state x (t)k) And the mode σ (t) activatedk) Updating the input according to the sampling informationIncoming signalWherein the content of the first and second substances,is a gain KiNeutralization of the activated modality σ (t)k) The corresponding gain.
Determining a sampling sequence of a systemWhere k denotes the sample number, N0Denotes the number of samples, where t 00. It will be appreciated that the sample sequence has a fixed sampling interval delta.
Specifically, the switching system may be sampled by a sampler to collect the current sampling time tkSystem state x (t)k) And the mode σ (t) activatedk) And transmitted to the controller via the communication network, and the controller calculates the control signal according to the sampling informationAnd feeds back to the switching system through the communication network to update the input signal of the switching system. Wherein the content of the first and second substances,in a mode σ (t) with activationk) Corresponding gain, e.g. the activated mode being the 7 th mode, from which gain K is selected7As a calculated gain.
In the application, for a linear switching system with an unstable mode, the controller is designed by the method, and the stable state and the unstable state are comprehensively considered, so that the stability of signal input of the switching system can be improved.
In an embodiment, as shown in fig. 3, on the basis of designing the controller based on the above method, the method further includes:
step S200: the sampling time interval delta is optimized.
Specifically, step S200 includes:
step S210: constructing a sampling interval constraint condition:
κi=max{||Ai+BiKi||,||Di||},κij=max{||Aj+BjKi||,||Dj| l | }, wherein | a | | | represents the spectral norm of a;
ε satisfies:
wherein ω is1i=λiλmin(Pi),ω2i=||2PiBiKiL | where λmin(Pi) Representation matrix PiThe minimum eigenvalue of (c).
Step S220: and solving the sampling interval delta according to the sampling interval constraint condition.
It should be noted that, the solution range of the sampling time interval Δ is determined by the above method, and one solution may be arbitrarily selected from the solution range as the sampling time interval.
In an embodiment, as shown in fig. 3, on the basis of designing the controller and the sampling time interval, the switching signal is further optimized according to the following method, that is, the control method further includes:
step S300: the switching signal is optimized.
Specifically, step S300 includes:
step S310: constructing a switching model:
is provided withFor systematic switching sequences in which any two successive switching instants slAnd sl+1Satisfies sl+1-sl≥τd,τdIs the dwell time of the switching signal.
Wherein T, T ∈ R≥0,T≥t,ni(T, T) is the ith mode at [ T, T]Number of activations, Ti(T, T) is the ith mode at [ T, T]Total duration of inner, τaiIs the mode-dependent mean residence time of the ith mode, and satisfies tauai≥τd。T+(T, T) is unstable mode in [ T, T ]]In which T, T ∈ R≥0,T≥t,χ∈R≥0,τ+>R>1,τ+Is the average time fraction of the unstable mode. R≥aRepresenting a real number greater than or equal to a.
Step S320: constructing a switching constraint condition:
step S330: obtaining tau in switching model according to switching constraint condition+And τaiAnd determining a switching signal.
In this embodiment, different constraints are also set according to different modalities, and when a sampling interval is determined, multiple wakefulness states of a stable modality and an unstable modality are comprehensively considered, so that the stability of the input signal of the switching system is further improved.
In an embodiment, as shown in fig. 3, the control method further considers the influence of the network suffering from the denial of service attack, and comprehensively evaluates the stability of the current handover system, that is, the method includes:
step S400: and evaluating the stability of the system according to the maximum blocking rate which can be tolerated by the linear switching system and the blocking rate suffered by the current linear switching system.
The method comprises the following steps:
step S410: constructing a denial of service attack model:
wherein n (T, T) is a denial of service attack at [ T, T]Inner number of activations, | xi (T, T) | is denial of service attack [ T, T |)]Total duration of inner, τDIs to rejectAverage residence time of service attack, T*Is a denial of service attack at T, T]Mean time ratio of the components, eta and kappa as compensation parameters, T, T ∈ R≥0,T≥t,η,κ∈R≥0,τD>R≥Δ,T*>R>1。
Step S420: calculating the maximum blocking rate which can be tolerated by the linear switching system:
Step S440: judging whether the blocking rate F' suffered by the current linear switching system is smaller than the maximum blocking rate F which can be tolerated by the linear switching system, if so, indicating that the input state of the current linear switching system is stable, and if not, indicating that the input state of the current linear switching system is unstable.
Wherein, the blocking rate is represented as the frequency of the controller suffering from the denial of service attack in a signal interactive manner through a communication network. In this embodiment, the maximum blocking rate that the system can tolerate is derived according to the system parameters, and compared with the blocking rate actually suffered by the switching system in the current network, the stability of the current system in the current network is sequentially evaluated. ByIt can be seen that the mean time ratio τ of the different unstable modes is chosen+The maximum blocking rate that the system can tolerate is different, illustrating the present controlThe method represents a trade-off between the mean-time ratio of unstable modes and the resilience of the system against denial-of-service attacks. Therefore, the system-related parameters can be adjusted reversely according to the blocking rate F' suffered by the current linear switching system, and the tolerable maximum blocking rate F can be increased appropriately, so as to further improve the stability of the system.
It is to be understood that the order of the steps mentioned in the above embodiments is not limited to the order in the above embodiments, and the execution order of the steps can be flexibly adjusted as long as the method can be implemented.
Accordingly, the present application also proposes a control architecture with a linear switching system with unstable mode, as shown in fig. 1, the system includes:
the switching system is used for switching different modes according to the switching signal, and the switching system is provided with a stable mode and an unstable mode;
a sampler for acquiring a current sampling time t according to a sampling sequencekSystem state x (t)k) And the mode σ (t) activatedk) And transmitted to the controller through the communication network;
a controller for acquiring the sampling signal of the sampler and processing to obtain a control signal And transmits the control signal to the holder through a communication network, wherein,the gain determined for the control method above;
the retainer is used for acquiring a control signal of the controller and continuously outputting the control signal to the actuator;
and the actuator is used for acquiring the control signal of the retainer and inputting the control signal into the switching system to update the system input signal.
In an embodiment, the sampler is set with a sampling interval Δ, which is the sampling interval Δ determined according to the control method above.
In an embodiment, the switching signal is a switching signal determined according to the above control method.
Specifically, the control system has been described above, and is not described herein again.
It is emphasized that, in the above control method, each model, the construction of the constraint condition and the expression of the tolerable maximum blocking rate are obtained by a great deal of deductive analysis of the applicant. In the application, the stability of the input state of the system can be improved by arranging a reasonable controller. Furthermore, on the basis of setting a reasonable controller, the sampling time interval and the switching signal are further optimized, and the stability of the input state of the system can be further improved by setting the reasonable controller, the sampling time interval and the switching signal. Furthermore, considering the denial of service attack, a denial of service attack model is constructed, the blocking rate suffered by the system and the maximum blocking rate which can be tolerated by the system are compared, the stability of the system can be evaluated, meanwhile, the maximum blocking rate which can be tolerated by the system can be improved by adjusting system parameters, and the stability of the input state of the system is further improved.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (10)
1. A method of controlling a linear switching system with unstable modes, comprising:
constructing a linear switching system model with interference terms: wherein, x (t)) For system state, u (t) is the input signal, d (t) is the unknown bounded interference, σ (t) is the mode activated at time t, Aσ(t)、Bσ(t)、Dσ(t)Are respectively a weighting matrix Ai、Bi、DiIn the weighting matrix corresponding to the activated mode σ (t), i ∈ Γ ═ { 1., N }, N is the total number of modes of the system, where r stable modes are ΓsR, N-r unstable modes are Γu={r,...N};
Constructing a controller model:Uj≤μiUi,Ui>0,i,j∈Г,i≠j,Ui、Tifor the model to be parameterized, λi、μiSetting parameters for the model;
2. The method of controlling a linear switching system with unstable mode according to claim 1, further comprising optimally selecting a sampling interval Δ:
wherein the content of the first and second substances,
3. The method of controlling a linear switching system with unstable mode according to claim 2, further comprising optimizing the switching signal:
constructing a switching model:
wherein n isi(T, T) is the ith mode at [ T, T]Number of activations, Ti(T, T) is the ith mode at [ T, T]Total duration of inner, τaiIs the modality-dependent mean residence time, T, of the ith modality+(T, T) is all unstable modes in [ T, T ]]Total duration of inner, τ+Is that all unstable modes have a duration of [ T, T ]]Mean time of day, τ+>1,n0iAnd χ is a compensation parameter;
constructing a switching constraint condition:
wherein the content of the first and second substances,
obtaining tau in switching model according to switching constraint condition+And τaiAnd determining a switching signal.
4. A control method for a linear switching system with unstable mode according to claim 3, characterized in that the control method further comprises evaluating the stability of the system according to the maximum blocking rate that the linear switching system can tolerate and the blocking rate that the current linear switching system suffers:
constructing a denial of service attack model:
wherein n (T, T) is a denial of service attack at [ T, T]Inner number of activations, | xi (T, T) | is denial of service attack [ T, T |)]Total duration of inner, τDIs the average residence time, T, of a denial of service attack*Is a denial of service attack at T, T]Mean time ratio of (T)*Greater than 1, eta and kappa are compensation parameters;
calculating the maximum blocking rate which can be tolerated by the linear switching system:
Judging whether the blocking rate F' suffered by the current linear switching system is smaller than the maximum blocking rate F which can be tolerated by the linear switching system, if so, indicating that the input state of the current linear switching system is stable, and if not, indicating that the input state of the current linear switching system is unstable.
5. The method according to claim 4, wherein the method determines whether a current blocking rate F' suffered by the linear switching system is less than a maximum blocking rate F that can be tolerated by the linear switching system, and if not, the system parameters are adjusted in a reverse direction to increase the maximum blocking rate F that can be tolerated by the linear switching system.
6. The method of claim 4, wherein χ ≧ 0, η ≧ 0, and κ ≧ 0.
7. The method of claim 1, wherein the controller model is solved by matlab toolbox.
8. A control architecture for a linear switching system with unstable modes, comprising:
the switching system is used for switching different modes according to the switching signal, and the switching system is provided with a stable mode and an unstable mode;
a sampler for acquiring a current sampling time t according to a sampling sequencekSystem state x (t)k) And the mode σ (t) activatedk) And transmitted to the controller through the communication network;
a controller for acquiring the sampling signal of the sampler and processing to obtain a control signalAnd transmits the control signal to the holder through a communication network, wherein,is based onGain determined by the control method for a linear switching system with unstable mode according to claim 1;
the retainer is used for acquiring a control signal of the controller and continuously outputting the control signal to the actuator;
and the actuator is used for acquiring the control signal of the retainer and inputting the control signal into the switching system to update the system input signal.
9. The control architecture of a linear switching system with unstable mode according to claim 8, characterized in that the sampler is set with a sampling interval Δ determined according to the control method of a linear switching system with unstable mode according to claim 2.
10. The control architecture of a linear switching system with unstable mode according to claim 8, characterized in that said switching signal is a switching signal determined according to the control method of a linear switching system with unstable mode according to claim 3.
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