CN103795790A - Distributed synchronous sampling and control system and method based on communication - Google Patents
Distributed synchronous sampling and control system and method based on communication Download PDFInfo
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Abstract
The invention relates to a distributed synchronous sampling and control system and method based on communication. The distributed synchronous sampling and control system based on communication comprises multiple distributed units and a main control unit, wherein the main control unit is a main controller, the distributed units comprise a distributed data acquisition unit, a distributed control execution unit and a data acquisition and control execution unit, FPGAs which are used for completing the communication encoding and decoding, synchronizing signal analysis and timing between the main control unit and the distributed units are set for the main control unit and the distributed units, and the main control unit is further provided with a DSP. According to the distributed synchronous sampling and control system and method based on communication, by means of the high time accuracy of the FPGAs, high-precision synchronous sampling and control of all the distributed units and the main controller are achieved through communication, and timing of the distributed units under the condition that communication is interrupted due to interference or frame loss occurs is achieved by means of the self-learning algorithm of time parameters. The distributed synchronous sampling and control system based on communication is simple, functional partition is distinct, and independent synchronizing signal wiring is not needed; the distributed synchronous sampling and control system based on communication has the advantages of being high in adaptability, high in synchronization precision, high in antijamming capability, high in stability, low in cost and the like.
Description
Technical field
The present invention relates to electric power system and power electronic equipment data acquisition and control, technical field belongs to Industry Control, and what be specifically related to is the distributed synchronization sampling control system realizing based on communication.
Background technology
In the application and development process of electric power system control protection and power electronic equipment; different or single covering device design resource capacity in the geographical position of installing due to relevant device limited; can not in single device, realize whole samplings and control function; equipment or system need to be designed to realize based on distributed sampling and control system the function of whole entirety, such as application such as common wind-powered electricity generation Variable flow control system, distributed power failure wave-recording collector equipment, distributed electrical minor instrument transformer collectors.These system or equipments, except adopting distributed mounting means, transmitting the basic characteristics such as data by the mode of communication, also have a key character, need strict sample-synchronous and control synchronous.At present, the domestic synchronized sampling control system localization rate of parts and components based on distributed structure/architecture is lower, and general direct introduction or purchase external off-the-shelf is with high costs, is unfavorable for promoting.
Summary of the invention
For the deficiency existing in prior art, the present invention seeks to be to provide a kind of distributed synchronization sampling control system and method thereof that is applicable to electric power system and power electronics application, the reliability of raising system, the in the situation that of distributed system frame losing in short-term, by time interval triggering synchronous sampling, the Synchronization Control of this self study, the accuracy that improves sampling and control, elevator system overall performance; .
For achieving the above object, technical scheme of the present invention is as follows:
The distributed synchronization sampling control system realizing based on communication, it comprises:
Multiple distributed unit, along locking and resolve sync message information, obtain synchronizing signal according to message delay and synchronization delayed time to the sync message due in receiving, the synchronizing signal of obtaining, alignment sampling trigger signal and control signal separately;
Main control unit, for completing calculating, logic judgement, and generates controlled quentity controlled variable and sync message, and sync message is handed down to each distributed subelement by the moment of setting;
Interconnected by communication between described main control unit and distributed unit, described main control unit and distributed unit be provided with for completing communication encoding and decoding between main control unit and distributed unit, synchronizing signal and resolve, punctual FPGA(Field-Programmable Gate Array, programmable gate array), described main control unit is also provided with the DSP (digital signal processor, digital signal processor) for image data calculation process and calculating controlled quentity controlled variable.
According to above-mentioned distributed synchronization sampling control system, wherein, described main control unit is connected by telecommunication cable or optical fiber with distributed unit, does not adopt synchronizing signal cable or the optical fiber of independent setting.
According to above-mentioned distributed synchronization sampling control system, wherein, what described main control unit adopted is master controller, and described distributed unit comprises: data acquisition unit, for analog quantity, digital data acquisition;
Control performance element, receive the controlled quentity controlled variable that master controller provides, realize the control to control object;
Data collection and control performance element, has data acquisition unit concurrently and controls performance element.
According to above-mentioned distributed synchronization sampling control system, wherein, between described DSP and FPGA, adopt several data transmission means respectively dissimilar data to be carried out alternately.
According to above-mentioned distributed synchronization sampling control system, wherein, described distributed unit is made up of High Performance DSP and FPGA.
A kind of control method of utilizing above-mentioned distributed synchronization sampling control system, it is characterized in that, its method is: main control unit is handed down to each distributed subelement by sync message by the moment of setting, each distributed unit along locking and resolve sync message information, obtains synchronizing signal according to message delay and synchronization delayed time by the sync message due in to receiving; Distributed unit is according to the synchronizing signal of obtaining, alignment sampling trigger signal and control signal separately, by this accurate synchronization mechanism, make each distributed unit trigger sampling, output control in strict accordance with consistent moment and unified beat, realize synchronized sampling, Synchronization Control.
According to above-mentioned distributed synchronization sampling control system, wherein, the data that collect of described distributed unit are by delivering to main control unit in communication, and the controlled quentity controlled variable that main control unit calculates is issued to distributed unit by communication.
According to above-mentioned distributed synchronization sampling control system, described distributed unit is according to the consistent moment, and wherein, time reference is provided by master controller, is benchmark according to the time of master controller, and by the synchronous each distributed unit of mode of communication message.The height time determinability that master controller and distributed unit utilize FPGA code to carry out is realized precise time control.
According to above-mentioned distributed synchronization sampling control system, wherein, in communication disruption or after being disturbed, within keeping scope that synchronous error allowing in the punctual duration of distributed unit in one of frequency generator or several control cycle.According to the different requirements of punctual duration, described distributed unit adopts common crystals, temperature compensating crystal oscillator or constant-temperature crystal oscillator as frequency generator.In power electronics application, General Requirements is less than 1 microsecond a control cycle inter-sync error, and several control cycles of keeping time in the situation that synchronizing signal is lost; The crystal oscillator of punctual duration and employing is relevant, and common crystals can realize the punctual of Millisecond duration, in several control cycles, guarantees synchronism; If employing constant-temperature crystal oscillator, can realize 1 hour inter-sync error and be less than 1 microsecond.
According to above-mentioned distributed synchronization sampling control system, wherein, the communication speed between described main control unit and distributed unit is 5Mbps～1000Mbps.
Have at the scene in the situation of electromagnetic noise, each bit multi-point sampling that distributed unit arrives communication, realizes filtering; In the time that heading is resolved, distributed unit comes by FPGA 100,000,000 high-frequency clock samplings the moment edge that accurate locking synchronization message frame head arrives, and goes to drive and trigger sampling or control logic by time delay given and calculating gained.
In order to improve the reliability of system, distributed unit, by self study, is grasped the interval time of advent of synchronized sampling message/Synchronization Control message.The in the situation that of distributed system frame losing in short-term, by time interval triggering synchronous sampling, the Synchronization Control of this self study.
System of the present invention forms simple, and function is divided distinct, without independent synchronizing signal wiring, takies resource few, and overall plan strong adaptability, cost are low; And communication media, traffic rate, coding rule are various, can meet the demand of different pieces of information amount, different application; System synchronization precision high (error ± 1us in), is conducive to the accuracy that improves sampling and control, elevator system overall performance; In addition, can realize cheaply punctual function of short time, improve the robustness of system, strong anti-interference performance, is adapted to Industry Control Application occasion.
Accompanying drawing explanation
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is distributed synchronization sampling control system block diagram of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
Referring to Fig. 1, this enforcement is according to the needs of function and mounting means, system is divided into main control unit and distributed unit, what main control unit adopted is controller, the data that collect of distributed unit are by delivering to master controller in communication, and the controlled quentity controlled variable that master controller calculates is also issued to distributed unit by communication.Distributed unit is divided into 3 types according to function: data acquisition unit, control performance element, data collection and control performance element.Wherein, master controller has been most calculating, logic judgement, and generates controlled quentity controlled variable; Data acquisition unit is for completing simple analog quantity, the collection of digital quantity, and by communication, data is delivered to master controller; Controlling performance element is the controlled quentity controlled variable providing for receiving master controller, realizes the control to control object, and control mode can be by switching value, pwm pulse etc.; Data collection and control performance element is have data acquisition unit concurrently and control performance element, does like this and can save cost and installing space in some application scenario.
Interconnected by communication between master controller and distributed unit.Communication media can be cable, also can be optical fiber; Traffic rate is optional from 5Mbps to 1000Mbps; Coded system adopts 1B2B(5Mbps～50Mbps according to different traffic rate), 4B5B(100Mbps), 8B10B(1000Mbps) etc. mode.It is dissimilar that the frame structure of communication is divided into synchronization frame, Frame, control frame etc. according to its function, and the distributed unit of difference in functionality can be selected required separately frame type, to improve communication efficiency.
In the present embodiment, master controller and distributed unit are all by High Performance DSP (digital signal processor) and FPGA(programmable gate array) form, work in coordination with the tasks such as communication, sampling, calculating, control.Under some application scenario, in order to save cost, distributed unit also can be by its function of FPGA complete independently.
In the present invention, utilize the control method of above-mentioned distributed synchronization sampling control system, concrete grammar is: main control unit is handed down to each distributed subelement by sync message by the moment of setting, each distributed unit along locking and resolve sync message information, obtains synchronizing signal according to message delay and synchronization delayed time by the sync message due in to receiving; Distributed unit is according to the synchronizing signal of obtaining, alignment sampling trigger signal and control signal separately, by this accurate synchronization mechanism, make each distributed unit trigger sampling, output control in strict accordance with consistent moment and unified beat, realize synchronized sampling, Synchronization Control.
Above-mentioned distributed unit is owing to having the punctual function of certain time length under FPGA effect, within can keeping in communication disruption or after being disturbed scope that synchronous error allowing in certain hour.
The height time determinability that main control unit and distributed unit utilize FPGA code to carry out is realized precise time control.Time reference is provided by master controller, and by the synchronous each distributed unit of mode of communication message.The functions such as the encoding and decoding of communicating by letter of master controller and distributed unit, synchronizing signal resolve, punctual are all completed by FPGA.Meanwhile, the different requirements according to practical application to synchronization accuracy, punctual duration, adopt respectively common crystals, temperature compensating crystal oscillator, constant-temperature crystal oscillator as frequency generator, to realize the synchronism of different accuracy grade and the length of Bu Tong keeping time.
Master controller is communication, computing and the processing center of whole system simultaneously.In order to realize multichannel distributed unit communication interface and high amount of traffic calculation process, master controller adopts the framework of High Performance DSP and high-performance FPGA combination, between DSP and FPGA, adopt several data transmission means respectively dissimilar data to be carried out alternately, to reach the object that improves data bandwidth and process real-time.For example, adopt asynchronous parallel interface transmitting control data, adopt high-speed synchronous serial line interface transmission sampled value.
The distributed unit of the present embodiment is generally arranged near sampling and control object, under strong electromagnetic interference environment.Distributed unit is at the scene in noisy situation, and each bit multi-point sampling that communication is arrived, realizes filtering; In the time that heading is resolved, come by FPGA 100,000,000 high-frequency clock samplings the moment edge that accurate locking synchronization message frame head arrives, and go to drive and trigger sampling or control logic by time delay given and calculating gained.
Meanwhile, distributed unit, the in the situation that of frame losing in short-term, can, by punctual and fault-tolerant processing, realize the communication function of seamless switching, and within the scope of the number of times of setting, assurance distributed system is normally worked.With respect to other frame losing processing method, as double-network communication, this method realizes simple, can effectively reduce engineering site wiring complexity.
The present invention utilizes said system and control method thereof, and it forms simple, and function is divided distinct, without independent synchronizing signal wiring, takies resource few, and overall plan strong adaptability, cost are low; And communication media, traffic rate, coding rule are various, can meet the demand of different pieces of information amount, different application; System synchronization precision high (error ± 1us in), is conducive to the accuracy that improves sampling and control, elevator system overall performance; In addition, can realize cheaply punctual function of short time, improve the robustness of system, strong anti-interference performance, is adapted to Industry Control Application occasion.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. the distributed synchronization sampling control system realizing based on communication, it comprises:
Multiple distributed unit,, obtain synchronizing signal according to message delay and synchronization delayed time, and utilize sync line-up sampling trigger signal and control signal separately along locking and resolve sync message information the sync message due in receiving;
Main control unit, for completing calculating, logic judgement, and generates controlled quentity controlled variable and sync message, and sync message is handed down to each distributed subelement by the moment of setting;
Interconnected by communication between described main control unit and distributed unit, described main control unit and distributed unit be provided with for completing communication encoding and decoding between main control unit and distributed unit, synchronizing signal and resolve, punctual FPGA, and described main control unit is also provided with for image data calculation process and calculates the DSP of controlled quentity controlled variable.
2. the distributed synchronization sampling control system realizing based on communication according to claim 1, is characterized in that, described main control unit is connected by telecommunication cable or optical fiber with distributed unit, does not adopt synchronizing signal cable or the optical fiber of independent setting.
3. the distributed synchronization sampling control system realizing based on communication according to claim 1, is characterized in that, what described main control unit adopted is master controller, and described distributed unit comprises: data acquisition unit, for analog quantity, digital data acquisition;
Control performance element, receive the controlled quentity controlled variable that master controller provides, realize the control to control object;
Data collection and control performance element, has data acquisition unit concurrently and controls performance element.
4. the distributed synchronization sampling control system realizing based on communication according to claim 1, it is characterized in that, described distributed unit also includes DSP, adopts several data transmission means respectively dissimilar data to be carried out alternately between described DSP and FPGA.
5. one kind is utilized the control method of distributed synchronization sampling control system described in claim 1-4 any one, it is characterized in that, its method is: main control unit is handed down to each distributed subelement by sync message by the moment of setting, each distributed unit along locking and resolve sync message information, obtains synchronizing signal according to message delay and synchronization delayed time by the sync message due in to receiving; Distributed unit is according to the synchronizing signal of obtaining, alignment sampling trigger signal and control signal separately, by this accurate synchronization mechanism, make each distributed unit trigger sampling, output control in strict accordance with consistent moment and unified beat, realize synchronized sampling, Synchronization Control.
6. control method according to claim 5, is characterized in that, the data that collect of described distributed unit are by delivering to main control unit in communication, and the controlled quentity controlled variable that main control unit calculates is issued to distributed unit by communication.
7. control method according to claim 5, is characterized in that, described distributed unit is according to the consistent moment, wherein, time reference is provided by master controller, is benchmark according to the time of master controller, and by the synchronous each distributed unit of mode of communication message; The height time determinability that master controller and distributed unit utilize FPGA code the to carry out time of realizing is controlled.
8. control method according to claim 5, is characterized in that, in communication disruption or after being disturbed, within distributed unit keeps scope that synchronous error allowing in the punctual duration of one of frequency generator or several control cycles; According to the different requirements of punctual duration, distributed unit adopts common crystals, temperature compensating crystal oscillator or constant-temperature crystal oscillator as frequency generator.
9. control method according to claim 5, is characterized in that, the communication speed between described main control unit and distributed unit is 5Mbps～1000Mbps.
10. control method according to claim 5, is characterized in that, has at the scene in the situation of electromagnetic noise, and each bit multi-point sampling that distributed unit arrives communication, realizes filtering; In the time that heading is resolved, distributed unit is by the FPGA 100,000,000 high-frequency clocks moment edge that locking synchronization message frame head arrives of sampling, and by given and calculate the time delay of gained and go to drive and trigger sampling or control logic.
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| CN104077257A (en) * | 2014-06-25 | 2014-10-01 | 西安电子科技大学 | FPGA (Field Programmable Gate Array) based multi-channel data transmission synchronization delay measurement method and system |
| CN106230681A (en) * | 2016-07-12 | 2016-12-14 | 上海交通大学 | A kind of communication for Complex Power electronics distributed AC servo system and Tong Bu system |
| CN106557051A (en) * | 2016-10-27 | 2017-04-05 | 珠海瓦特电力设备有限公司 | Distributed measurement and control system time synchronization system and method based on serial communication bus |
| CN107026649A (en) * | 2016-01-29 | 2017-08-08 | 欧姆龙株式会社 | Signal processing apparatus, signal processing method, message handling program and recording medium |
| CN107423251A (en) * | 2017-07-28 | 2017-12-01 | 北京印刷学院 | A kind of distributed data acquisition synchronous method and system |
| CN110875792A (en) * | 2019-11-29 | 2020-03-10 | 东南大学 | Battery management unit sampling and data uploading method based on active synchronization |
| CN117353463A (en) * | 2023-12-04 | 2024-01-05 | 广东电网有限责任公司中山供电局 | Synchronous sampling method and related device for multipath alternating current electric quantity |
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| CN104077257A (en) * | 2014-06-25 | 2014-10-01 | 西安电子科技大学 | FPGA (Field Programmable Gate Array) based multi-channel data transmission synchronization delay measurement method and system |
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| CN106557051A (en) * | 2016-10-27 | 2017-04-05 | 珠海瓦特电力设备有限公司 | Distributed measurement and control system time synchronization system and method based on serial communication bus |
| CN107423251A (en) * | 2017-07-28 | 2017-12-01 | 北京印刷学院 | A kind of distributed data acquisition synchronous method and system |
| CN110875792A (en) * | 2019-11-29 | 2020-03-10 | 东南大学 | Battery management unit sampling and data uploading method based on active synchronization |
| CN117353463A (en) * | 2023-12-04 | 2024-01-05 | 广东电网有限责任公司中山供电局 | Synchronous sampling method and related device for multipath alternating current electric quantity |
| CN117353463B (en) * | 2023-12-04 | 2024-03-19 | 广东电网有限责任公司中山供电局 | Synchronous sampling method and related device for multipath alternating current electric quantity |
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Address after: High road high tech Development Zone Nanjing city Jiangsu province 210061 No. 20 Applicant after: NARI Technology Development Co., Ltd. Applicant after: SGCC NARI Nanjing Control System Co., Ltd. Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Applicant before: NARI Technology Development Co., Ltd. Applicant before: SGCC NARI Nanjing Control System Co., Ltd. |
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Application publication date: 20140514 |