CN102033529A - Method for compensating for unknown network time delay in forward path of network cascade control system - Google Patents
Method for compensating for unknown network time delay in forward path of network cascade control system Download PDFInfo
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Abstract
The invention provides a method for compensating for an unknown network time delay in a forward path of a network cascade control system and belongs to the technical field of network control systems. A real network data transmission process between forward path nodes is adopted to substitute for a network time delay compensation model between the nodes; the measurement, the observation, the estimation or the identification of a network data transmission unknown time delay between the forward path nodes are eliminated; and the requirement on the synchronization of a node clock signal is eliminated. By the method, the influence of the unknown network time delay on the stability of the system can be reduced and the control performance quality of the system is improved. The method is applied to the dynamic compensation and control of the unknown network time delay only existing in the forward path of the network cascade control system, in which the main and secondary controlled target mathematical models are known or unknown, the network has a certain amount of packets, and the network time delay can be more than several even over ten sampling periods.
Description
Technical field
The present invention relates to the compensation method of network cascade control system through path unknown network time delay, belong to the network control system technical field.
Background technology
Network control system (Networked control systems, NCS) each parts (transmitter, controller and actuator etc.) that are meant control system pass through communication network, the real-time closed-loop control system that connects and composes. compare with the control system of point-to-point in the past, network control system has resource sharing, be easy to installation and maintenance, yet advantages such as low expense., because network bandwidth resources is limited, inevitably exist problems such as Internet resources competition and network congestion in the network, thereby cause problems such as data-bag lost or propagation delay time.
In actual industrial process control, cascade control system is a most widely used important control structure except the single loop FEEDBACK CONTROL. cascade control system belongs to complex control system, because it is very effective that cascade control system is improved adjustment process, has the better controlled performance, thereby in fields such as actual industrial production process control and robot control, obtained to use widely. along with the widespread use of Distributed Control System (DCS) and fieldbus, in cascade control system, transmitting real-time control information by dedicated network or fieldbus more and more. control loop is the control system by the real-time network closure in the cascade control system, be referred to as network cascade control system (NCCS), the typical structure block diagram that is applicable to network cascade control system of the present invention is as shown in Figure 1.
The network cascade control system is a class special networks control system, it fully combines the advantage of network control system and cascade control system, not only can reduce system cost greatly, improve the system diagnostics maintenance levels, can also overcome internal disturbance fast, improve the system works frequency. therefore, necessary cascade control system in the network control system is carried out deep research.
Because networked cascade control system is the network control system of closed loop more than, analysis to network delay influence is more complex more than the single loop network control system with the research of system performance. but owing in inside and outside close loop control circuit, having introduced network, to produce network delay and data-bag lost inevitably. time delay and data packet loss will reduce the performance of control system, even cause system's instability. when network delay greater than several and even dozens of during the sampling period, still do not have preferably control strategy or compensation method both at home and abroad so far and satisfy the control of quality requirement.
Existing only in main transformer at network send (control) device node and secondary the change to send between (control) device node (outer feedforward network), and the secondary network cascade control system as shown in Figure 2 of giving (interior feedforward network) between (control) device node and the actuator node that becomes, its input R (s) and output Y
1(s) closed loop between is transmitted letter
In the formula: C
1(s) be master controller, C
2(s) be submaster controller; G
1(s) be main controlled device, G
2(s) be secondary controlled device; τ
1Expression is sent (control) device node to be transferred to secondary the change from main transformer network data and is sent the unknown network time delay that is produced between (control) device node; τ
2Expression becomes network data from pair send (control) device node to be transferred to the unknown network time delay that the actuator node is produced.
Owing to comprise network delay τ in the denominator of the closed loop transfer function, shown in the equation (1)
1And τ
2Exponential term
With
The existence of time delay will worsen the control performance quality of system, even cause system's loss of stability, when serious system be broken down.
Reduce time delay to the sex key of system stability, just be to realize to send (control) device node and pair to become the network delay τ that send between (control) device node main transformer
1Exponential term
And the pair change send (control) device node to the network delay τ between the actuator node
2Exponential term
From the denominator of equation (1), remove, promptly realize not comprising in system's closed loop secular equation the exponential term of all-network time delay, yet and then realization is to the compensation of network delay., realize compensation to network delay, at first must know the size of network delay. at present, the method that adopts usually is by to network delay τ both at home and abroad
1And τ
2Measurement, come delay compensation τ
1And τ
2Influence to system stability. still, because to network delay τ
1And τ
2Accurate measurement need satisfy the synchronous requirement of node clock signal, if adopt hardware to realize that node clock signal is synchronous fully, then need bigger economy input; If adopt software position signal, when then between node, transmitting, may meet with the influence of network delay owing to correction signal, be difficult to realize that nodal clock is synchronous fully; If adopt size to network delay is estimated, observation, identification or forecast method obtain network delay, then at first must know the accurate probability distribution of network delay, or mathematical model accurately, but because the size of network delay is relevant with concrete factors such as procotol, offered load size and network topology structure, to estimation, observation, the identification of network delay or predict and all may have deviation.
Therefore, how to exempt the requirement synchronous to node clock signal, release is to estimation, observation, identification or the prediction of network delay between the node, can obtain simultaneously between the node time delay value accurately again, and then realize compensation and control to network cascade control system through path unknown network time delay, having become in the research of network cascade control system needs one of key issue that solves.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of network that relates to and exist only in main transformer and send (control) device node and secondary the change to send between (control) device node (outer feedforward network), and the network cascade control system unknown network delay compensation method of (interior feedforward network) between (control) device node and the actuator node is sent in secondary change.
Purpose of the present invention:
In the network cascade control system, the difficult problem of network delay " indeterminacy ", the present invention proposes a kind of release requirement synchronous to node clock signal, also exempt simultaneously delay compensation method, realize the segmentation of network delay, real-time, online and dynamic compensation and control to measurement, estimation or the identification of unknown network time delay between its node.
The method that the present invention adopts is:
The first step: adopt main transformer to send (control) device node to send the live network data transmission procedure between (control) device node to replace the compensation model of network delay therebetween to secondary the change, thereby the system that structurally realizes does not comprise the compensation model of network delay therebetween. no matter send (control) device node how complicatedly and uncertain to have to the secondary network path that send (control) device node that becomes from main transformer, also no matter include therebetween what routers or (with) intermediate link, the network delay that information flow experienced is exactly a real network delay in the control procedure, has just realized the compensate function to its time delay in the information stream transmission process.
Second step: adopt secondary the change to send (control) device node to replace the compensation model of network delay therebetween to the live network data transmission procedure between the actuator node, thereby the system that structurally realizes does not comprise the compensation model of network delay therebetween. how complicated and uncertain no matter send (control) device node to have to the network path the actuator node from the pair change, also no matter include therebetween what routers or (with) intermediate link, the network delay that information flow experienced is exactly a real network delay in the control procedure, has just realized the compensate function to its time delay in the information stream transmission process.
The 3rd step: at network cascade control system shown in Figure 2, the network delay collocation structure of enforcement the inventive method is as shown in Figure 3.
In Fig. 3, do not comprise the prediction model of major-minor controlled device, from the input R (s) of system to output Y
1(s) closed loop transfer function, between is
In the closed loop transfer function, denominator shown in the formula (2), do not comprise network delay τ
1And τ
2Exponential term
With
Promptly realized closed loop secular equation 1+C
1(s) C
2(s) G
2(s) G
1(s)+C
2(s) G
2(s)=0 do not comprise the exponential term of network delay in, thereby eliminated the influence of network delay, improved the control performance quality of system, realized compensate function the unknown network time delay to system stability.
The scope of application of the present invention:
The present invention is applicable to that major-minor controlled device mathematical model is known or is uncertain of, there is a certain amount of data packet loss in network, network delay can be greater than several and even dozens of sampling period, network exists only in main transformer and send (control) device node and secondary the change to send between (control) device node (outer feedforward network), and secondary dynamic compensation and the control that becomes the network cascade control system unknown network time delay of sending (interior feedforward network) between (control) device node and the actuator node.
The invention is characterized in that this method may further comprise the steps:
1, when sending (control) device node, main transformer is sampled cycle h
1During triggering, will adopt mode A to carry out work;
2, send (control) device node with error signal e when main transformer
0(s) become when sending (control) device node to transmit to pair by outer feedforward network path, will adopt mode B to carry out work;
3, when becoming, pair send (control) device node to be sampled cycle h
2During triggering, will adopt mode C to carry out work;
4, when becoming, pair send (control) device node by error signal e
0When (s) triggering, will adopt mode D to carry out work;
5, when becoming, pair send (control) device node with error signal e
1(s) pass through interior feedforward network path when the actuator node transmits, will adopt mode E to carry out work;
6, when the actuator node by signal e
1When (s) triggering, will adopt mode F to carry out work.
The step of mode A comprises:
A1: main transformer send (control) device node to work in the time type of drive, and it triggers the sampling period is h
1
A2: after main transformer send (control) device node to be triggered, to main controlled device G
1(s) output signal Y
1(s) sample;
A3: with given signal R of system (s) and Y
1(s) add and subtract mutually, obtain the external loop error signal e
0(s).
The step of mode B comprises:
B1: main transformer send (control) device node with error signal e
0(s), send the transmission of (control) device node by outer feedforward network path to the pair change.
The step of mode C comprises:
C1: the secondary change send (control) device node to work in the time type of drive, and it triggers the sampling period is h
2
C2: after secondary change send (control) device node to be triggered, to secondary controlled device G
2(s) output signal Y
2(s) sample.
The step of mode D comprises:
D1: error signal e
0(s) trigger secondary the change and send (control) device node, the pair of this moment becomes send (control) device node to work in event driven manner;
D2: with e
0(s) and Y
2(s) add and subtract mutually, obtain error signal e
1(s).
The step of mode E comprises:
E1: the secondary change send (control) device node with error signal e
1(s), transmit to the actuator node by interior feedforward network path.
The step of mode F comprises:
F1: the actuator node works in event driven manner;
F2: the actuator node is by error signal e
1(s) trigger;
F3: with e
1(s) and Y
1(s) subtract each other, obtain error signal e
2(s);
F4: to e
2(s) implement control algolithm C
1(s), the control signal of its output is u
1(s);
F5: with u
1(s) and Y
2(s) subtract each other, obtain error signal e
3(s);
F6: to e
3(s) implement control algolithm C
2(s), the control signal of its output is u
2(s);
F7: with u
2(s) as drive signal, to secondary controlled device G
2(s) implement control, thereby change G
2(s) state, and then change G
1(s) state,
Realization is to G
1(s) and G
2(s) control action.
7, delay compensation method of the present invention, it is characterized in that main transformer send (control) device node to be made up of the embedded master controller of main transmitter, the shared same node of promptly main transmitter and master controller, main transformer send (control) device node employing time to drive triggered mode of operation, and (sampling period is h
1).
8, delay compensation method of the present invention, it is characterized in that secondary the change send (control) device node to be made up of the embedded submaster controller of secondary transmitter, be the shared same node of secondary transmitter and submaster controller, the secondary transmitter employing time drives triggered mode of operation, and (sampling period is h
2), (trigger pip is e and submaster controller adopts the event-driven triggered mode of operation
0(s)).
9, delay compensation method of the present invention, it is characterized in that system comprises main transformer and send (control) device node, the secondary change to send unit such as (control) device node, actuator node, main controlled device and secondary controlled device, each unit carries out work according to the working method of setting separately.
10, delay compensation method of the present invention, it is characterized in that sending the network data transmission process of external loop feedforward network path (control) device node to replace network delay compensation model therebetween, thereby the system that structurally realizes does not comprise the compensation model of network delay therebetween with sending (control) device node to become from main transformer really to pair.
11, delay compensation method of the present invention, it is characterized in that sending (control) device node to replace network delay compensation model therebetween, thereby the system that structurally realizes does not comprise the compensation model of network delay therebetween to the network data transmission process of inner looping feedforward network path the actuator node with becoming from pair really.
12, delay compensation method of the present invention is characterized in that exempting send (control) device node to send measurement, observation, estimation or the identification of network delay (control) device node to secondary change from main transformer from structure; Release becomes pair send measurement, observation, estimation or the identification of (control) device node to network delay between the actuator node.
13, delay compensation method of the present invention is characterized in that sending (control) device node, the secondary change to send (control) device node and the synchronous requirement of actuator node clock signal from the structure release to main transformer.
14, delay compensation method of the present invention is characterized in that realizing from structure the enforcement and concrete control strategy C of network delay compensation method
1(s) and C
2(s) selection is irrelevant, and is also irrelevant with the selection of concrete network communication protocol simultaneously.
15, delay compensation method of the present invention is characterized in that need not to know and the mathematical model of major-minor controlled device just can realize the full remuneration to network cascade control system through path unknown network time delay, improves the control performance quality of system.
16, delay compensation method of the present invention, what it is characterized in that adopting is the compensation method that " soft " changes the control system structure, need not increases any hardware device again, and the software resource that utilizes existing network cascade control system intelligent node to carry just is enough to realize its compensate function.
17, delay compensation method of the present invention, the mode A of it is characterized in that are applicable to that main transformer send (control) device node periodic sampling and signal is handled.
18, delay compensation method of the present invention, the mode B of it is characterized in that are applicable to that main transformer send (control) device node transmitting network data.
19, delay compensation method of the present invention, the mode C of it is characterized in that are applicable to that secondary the change send (control) device node periodic sampling and signal is handled.
20, delay compensation method of the present invention, the mode D of it is characterized in that are applicable to that secondary the change send (control) device node that signal is handled.
21, delay compensation method of the present invention, the mode E of it is characterized in that are applicable to that secondary the change send (control) device node transmitting network data.
22, delay compensation method of the present invention, the mode F of it is characterized in that are applicable to that the actuator node is implemented to control and the driving function.
The present invention has following advantage:
1, send (control) device node to send (control) device node (external loop through path) owing to having exempted to main transformer to secondary the change from structure, and secondary the change sent the measurement of (control) device node to (inner looping through path) unknown network time delay between the actuator node, observation, estimate or identification, also exempted the synchronous requirement of node clock signal simultaneously, and then avoided the inaccurate evaluated error that causes of time delay estimation model, avoided the required waste that expends the node storage resources of time delay identification, also avoided simultaneously because the compensating error that " the empty sampling " that time delay causes or " many samplings " bring.
2, owing to realized with the selection of concrete network communication protocol irrelevantly from structure, thereby both be applicable to the network cascade control system that adopts wired network protocol, also be applicable to the network cascade control system of wireless network protocol; Both be applicable to the deterministic network agreement, also be applicable to the procotol of uncertainty.
3, owing to realized with the selection of concrete network communication protocol irrelevant from structure, thereby both be applicable to heterogeneous network cascade control system based on wired network protocol, also be applicable to heterogeneous network cascade control system, also be applicable to the delay compensation of the network cascade control system of heterogeneous (as wired and wireless mixing) simultaneously based on wireless network protocol.
4, owing to realized with the selection of concrete master (or secondary) controller control strategy irrelevant from structure, thereby both can be used for adopting the network cascade control system of conventional control, also can be used for adopting Based Intelligent Control or adopt the network cascade control system of complicated control strategy.
5, because the present invention adopts is the compensation method that " soft " changes the control system structure, thereby in its implementation procedure, need not to increase again any hardware device, the software resource that utilizes existing network cascade control system intelligent node to carry, just be enough to realize its compensate function, thereby can save hardware investment, be easy to be extended and applied.
Description of drawings
Fig. 1 exists only in network cascade control system block scheme in the through path for network.
Fig. 2 exists only in network cascade control system structural drawing in the through path for network.
Fig. 3 is a network cascade control system through path unknown network delay compensation method structural drawing of the present invention
In the block diagram of Fig. 1, system is by input signal (R), and main transformer send (control) device (S1/C
1) node, outer feedforward network, the secondary change sent (control) device (S2/C
2) node, interior feedforward network, actuator (A) node, secondary controlled device (G2) and output (Y2), and main controlled device (G1) and output (Y1) form.
Built-in master controller in the main transmitter, namely main transmitter and master controller share same node (S1/C
1), node adopts the time type of drive to carry out work, and the triggering cycle is h1, to the sampling of main controlled device implementation cycle, and to deviation signal enforcement C1Control.
Built-in submaster controller in the secondary transmitter, namely secondary transmitter and submaster controller share same node (S2/C
2), wherein: secondary transmitter adopts the time type of drive to carry out work, and the triggering cycle is h2, the secondary controlled device implementation cycle is sampled; And submaster controller adopts the event type of drive to carry out work, send (control) device (S by main transformer1/C
1) output signal of node triggers by outer feedforward network.
Actuator (A) is an isolated node, adopts the event type of drive to carry out work, is become by pair and send (control) device (S2/C
2) output signal node triggers by interior feedforward network, and driving executing agency, thereby change secondary controlled device (G2) state, and then change main controlled device (G1) state.
The main transformer of system send (control) device (S among Fig. 11/C
1) node, the secondary change sent (control) device (S2/C
2) node and actuator (A) node all be intelligent node, not only possess storage computing and communication function, but also possess software configuration and control function, these nodes comprise now the hardware such as intelligent node common in the industrial field bus control system (FCS) of extensive use and the Distributed Control System (DCS) or smart machine.
In the system of Fig. 2, the unknown network time delay in the data transmission has significant impact for stability and the control performance quality of system. and the data transmission of network cascade control system is being experienced from main transformer and is being sent (control) device node to the secondary network data propagation delay time τ that send (external loop through path) (control) device node that becomes1, and secondary the change sent the network data propagation delay time τ of (control) device node to (inner looping through path) between the actuator node2Impact. time delay is relevant with the concrete factors such as procotol, offered load size and network topology structure, yet for the measurement of network delay or estimate or observation or identification have become the crucial precondition that realizes its compensation., the distributivity of each node by network connection is so that each node in the network cascade control system is difficult to satisfy the requirement of clock signal synchronization. simultaneously, because the unknown of network delay and sudden will accomplish that each step can both Accurate Prediction be impossible.
In the system of Fig. 3, do not comprise from main transformer and send (control) device node to send the network delay of (external loop through path) (control) device node to estimate model to secondary the change, do not comprise from the pair change yet and send (control) device node to estimate model to the network delay of (inner looping through path) the actuator node. exempted unknown network time delay τ1And τ2Measurement, estimation, observation or identification, also exempted simultaneously the requirement to node (main transformer send (control) device, secondary change to send (control) device, actuator) clock signal synchronization. when major-minor controlled device and its are estimated model and equated, can realize the output signal Y from the input signal R (s) of system to system1(s) in the closed loop transfer function,, with network delay τ1And τ2Exponential termWith
From denominator, eliminate, namely realize not comprising in the closed loop characteristic equation network delay τ1And τ2Exponential term, thereby reduced the impact of time delay to the stability of a system, improved the control performance quality of system, realize dynamic compensation and control to the unknown network time delay.
Embodiment
To make clearer above-mentioned and other feature and advantage of the present invention of those of ordinary skill in the art by describing exemplary embodiment of the present invention in detail below with reference to accompanying drawing 3.
Concrete implementation step is as described below:
The first step: the main transformer that works in the time type of drive send (control) device node to main controlled device G
1(s) output signal Y
1(s) (sampling period is h to carry out periodic sampling
1), and with given signal R of system (s) and Y
1(s) add and subtract mutually, obtain error signal e
0(s);
Second step: the pair that works in the time type of drive becomes send (control) device node to secondary controlled device G
2(s) output signal Y
2(s) (sampling period is h to carry out periodic sampling
2);
The 3rd step: main transformer send (control) device node to pass through external loop feedforward network path with signal e
0(s) be transferred to secondary the change and send (control) device node;
The 4th step: the secondary change sent (control) device signal e that node is transmitted by external loop feedforward network path
0(s) trigger (Event triggered working method), in its node, implement signal e
0(s) with signal Y
2(s) the phase plus and minus calculation obtains error signal e
1(s);
The 5th step: the secondary change send (control) device node to pass through interior feedforward network path with signal e
1(s) transmit to the actuator node;
The 6th step: the actuator node that works in event driven manner is by e
1(s) signal triggers, and implements e in its node
1(s) subtract Y
1(s) computing obtains error signal e
2(s); To e
2(s) implement C
1(s) control strategy, its output signal are u
1(s); With u
1(s) deduct Y
2(s), obtain error signal e
3(s); To e
3(s) implement C
2(s) control strategy, its output signal are u
2(s), with u
2(s) drive topworks, thereby change secondary controlled device G
2(s) state, and then change main controlled device G
1(s) state is realized G
1(s) and G
2(s) control action;
The 7th step: return the first step.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
The content that is not described in detail in this instructions belongs to this area professional and technical personnel's known prior art.
Claims (16)
1. the compensation method of network cascade control system through path unknown network time delay is characterized in that this method may further comprise the steps:
(1). when sending (control) device node, main transformer is sampled cycle h
1During triggering, will adopt mode A to carry out work;
(2). when main transformer send (control) device node with error signal e
0(s) become when sending (control) device node to transmit to pair by outer feedforward network path, will adopt mode B to carry out work;
(3). when becoming, pair send (control) device node to be sampled cycle h
2During triggering, will adopt mode C to carry out work;
(4). when becoming, pair send (control) device node by error signal e
0When (s) triggering, will adopt mode D to carry out work;
(5). when becoming, pair send (control) device node with error signal e
1(s) pass through interior feedforward network path when the actuator node transmits, will adopt mode E to carry out work;
(6). when the actuator node by signal e
1When (s) triggering, will adopt mode F to carry out work.
2. compensation method according to claim 1 is characterized in that the step of described mode A comprises:
A1: main transformer send (control) device node to work in the time type of drive, and it triggers the sampling period is h
1
A2: after main transformer send (control) device node to be triggered, to main controlled device G
1(s) output signal Y
1(s) sample;
A3: with given signal R of system (s) and Y
1(s) add and subtract mutually, obtain the external loop error signal e
0(s).
3. compensation method according to claim 1 is characterized in that the step of described mode B comprises:
B1: main transformer send (control) device node with error signal e
0(s), send the transmission of (control) device node by outer feedforward network path to the pair change.
4. compensation method according to claim 1 is characterized in that the step of described mode C comprises:
C1: the secondary change send (control) device node to work in the time type of drive, and it triggers the sampling period is h
2
C2: after secondary change send (control) device node to be triggered, to secondary controlled device G
2(s) output signal Y
2(s) sample.
5. compensation method according to claim 1 is characterized in that the step of described mode D comprises:
D1: error signal e
0(s) trigger secondary the change and send (control) device node, the pair of this moment becomes send (control) device node to work in event driven manner;
D2: with e
0(s) and Y
2(s) add and subtract mutually, obtain error signal e
1(s).
6. compensation method according to claim 1 is characterized in that the step of described mode E comprises:
E1: the secondary change send (control) device node with error signal e
1(s), transmit to the actuator node by interior feedforward network path.
7. compensation method according to claim 1 is characterized in that the step of described mode F comprises:
F1: the actuator node works in event driven manner;
F2: the actuator node is by error signal e
1(s) trigger;
F3: with e
1(s) and Y
1(s) subtract each other, obtain error signal e
2(s);
F4: to e
2(s) implement control algolithm C
1(s), the control signal of its output is u
1(s);
F5: with u
1(s) and Y
2(s) subtract each other, obtain error signal e
3(s);
F6: to e
3(s) implement control algolithm C
2(s), the control signal of its output is u
2(s);
F7: with u
2(s) as drive signal, to secondary controlled device G
2(s) implement control, thereby change G
2(s) state, and then change G
1(s) state is realized G
1(s) and G
2(s) control action.
8. method according to claim 1, it is characterized in that main transformer send (control) device node to be made up of the embedded master controller of main transmitter, the shared same node of promptly main transmitter and master controller, main transformer send (control) device node employing time to drive triggered mode of operation, and (sampling period is h
1).
9. method according to claim 1, it is characterized in that secondary the change send (control) device node to be made up of the embedded submaster controller of secondary transmitter, be the shared same node of secondary transmitter and submaster controller, the secondary transmitter employing time drives triggered mode of operation, and (sampling period is h
2), (trigger pip is e and submaster controller adopts the event-driven triggered mode of operation
0(s)).
10. method according to claim 1, it is characterized in that system comprises main transformer and send (control) device node, the secondary change to send unit such as (control) device node, actuator node, main controlled device and secondary controlled device, each unit carries out work according to the working method of setting separately.
11. method according to claim 1, it is characterized in that with sending (control) device node to send the network data transmission process of external loop feedforward network path (control) device node to replace network delay compensation model therebetween from main transformer really to secondary the change, and send (control) device node to replace network delay compensation model therebetween to the network data transmission process of inner looping feedforward network path the actuator node with becoming from pair really, thereby the system that structurally realizes does not comprise the compensation model of network delay.
12. method according to claim 1, it is characterized in that sending (control) device node to secondary the change send (control) device node from main transformer, and secondary the change sent measurement, observation, estimation or the identification of (control) device node to network delay between the actuator node from the structure release; Release send (control) device node, the secondary change to send (control) device node and the synchronous requirement of actuator node clock signal to main transformer.
13. method according to claim 1 is characterized in that realizing from structure the enforcement and concrete control strategy C of network delay compensation method
1(s) and C
2(s) selection is irrelevant, and is irrelevant with the selection of concrete network communication protocol.
14. method according to claim 1 is characterized in that need not to know and the mathematical model of major-minor controlled device just can realize the full remuneration to network cascade control system through path unknown network time delay, improves the control performance quality of system.
15. method according to claim 1, what it is characterized in that adopting is the compensation method that " soft " changes the control system structure, need not increases any hardware device again, and the software resource that utilizes existing network cascade control system intelligent node to carry just is enough to realize its compensate function.
16. method according to claim 1, the mode A of it is characterized in that is applicable to that main transformer send (control) device node periodic sampling and signal is handled; Mode B is applicable to that main transformer send (control) device node transmitting network data; Mode C is applicable to that secondary the change send (control) device node periodic sampling and signal is handled; Mode D is applicable to that secondary the change send (control) device node that signal is handled; Mode E is applicable to that secondary the change send (control) device node transmitting network data; Mode F is applicable to that the actuator node is implemented to control and the driving function.
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