CN101707351B - Protection circuit for preventing microcomputer protection device against interference and error actions - Google Patents
Protection circuit for preventing microcomputer protection device against interference and error actions Download PDFInfo
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- CN101707351B CN101707351B CN2009101924379A CN200910192437A CN101707351B CN 101707351 B CN101707351 B CN 101707351B CN 2009101924379 A CN2009101924379 A CN 2009101924379A CN 200910192437 A CN200910192437 A CN 200910192437A CN 101707351 B CN101707351 B CN 101707351B
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Abstract
The invention discloses a protection circuit for preventing a microcomputer protection device against interference and error actions and aims to provide a protection circuit for preventing a microcomputer protection device against interference and error actions, which has simple hardware structure, convenient adjustment and low cost, fully ensures the reliability and the safety of a control outlet protected by a relay and can prevent the control outlet from runaway which will cause the error actions of a controlled switch despite of the program runaway of a plurality of CPUs. The protection circuit for preventing a microcomputer protection device against interference and error actions comprises an input signal filter circuit (1), a power supply filter circuit (2) and a single board computer (SBC) (3), wherein the SBC (3) comprises an analog-to-digital (A/D) conversion input circuit (31), a control input/outlet (I/O) interface circuit (32) and a multilevel switching-closing relay protection circuit (4) which comprises an anti-interference logic module (41) and a multilevel switching-closing relay (42). The invention can be widely applied to the field of intelligent-type microcomputer comprehensive protection devices of a power system.
Description
Technical field
The present invention relates to a kind of microcomputer protecting device that prevents and disturbed the protective circuit with misoperation.
Background technology
Microcomputer protecting device is meant the digital protective relay system that microsystem constitutes, and reliability requirement must be accomplished: ability quick acting when fault takes place; Can not misoperation when fault not.Yet during high-voltage switch gear break-make inductive load (like inductive loads such as motor), switch contact arcing meeting produces very strong electromagnetic interference and surge disturbs, and the order of severity can cause the program fleet of CPU.This electromagnetic interference is the No.1 strong interferers of high-voltage switch gear microcomputer protection system, mainly invades microcomputer protection system through power line and D.C mutual-inductor A/D conversion loop.The microcomputer protection system long-term work is in this strong electromagnetic, and interference free performance becomes one of important indicator of weighing microcomputer protection system.
The fundamental way that improves the interference free performance of microcomputer protecting device is to block the coupling channel of common mode disturbances, improves the antijamming capability in responsive loop, measures such as appropriate design ground connection bleed-off circuit.The Electromagnetic Compatibility design is a complicated system engineering, considers that from hardware Anti-interference Design is very important, but wants that it is impossible from hardware, eliminating interference fully, also will consider digital filtering etc. from software, is difficult to accomplish perfection.Domestic Anti-Jamming Technique can be divided into two big types; One type is the invasion passage from the hardware circuit barrage jamming signal, adds that the input of prefilter, power supply adds power-supply filter, switch is gone into switch like analog channel and goes out to add Anti-Jamming Technique, grounding technology and shield technology of light-coupled isolation, pCB place and route or the like; Another kind of is the Software Anti-interference measure, comprises digital filtering, instruction redundancy, software trap, software and hardware house dog etc.Hardware measure is anti-interference to be to refuse interference signal in outdoors, is the main direction of electromagnetic Compatibility Design.Software Anti-interference is under hardware did not lose efficacy prerequisite as yet, utilizes the flexibility design of software to offset the influence of interference, can only play auxiliary anti-interference effect.Prevent that microcomputer protecting device control outlet measure commonly used out of control from having two kinds: hardware redundancy design and software redundancy design.Hardware redundancy design basic skills is to adopt two or multi-CPU structure, a startup of being responsible for protection, the execution that another CPU is responsible for protecting.Two CPU phases " with " just begin the control outlet.The following measure of the main employing of software redundancy design: one, multiple trip signal is set, divides many control commands to carry out separating brake, between every instruction, carry out one section check program, corresponding marker bit is set.Just carry out next bar instruction after CPU checks flag bit and conforms to, otherwise initialization comes heavily.Two, the state information of current output state register is set, and system's these states of operation self-check program cyclic query test are made mistakes if find to disturb, and in time correct the error message of output channel.
The multi-CPU structure design is to prevent to protect malfunction, improves a kind of effective measures of microcomputer protection system reliability, but adopts multi-CPU structure to make hardware configuration complicated; Debug loaded down with trivial detailsly, cost is high, and when many CPU while program fleets; Cause the control outlet out of control equally, might cause malfunction.The software redundancy design proposes (to suppose that promptly the CPU working procedure is correct under the program running normal condition; Do not overstep the limit), if program fleet, unreachable software redundancy is designed program; Then the control outlet is in runaway condition; Watchdog circuit was worked, made cpu reset come back to normal procedure, the time of experience is the shortest also wants several milliseconds.During this period of time, interference signal is enough to cause the mistrip of control outlet.Obviously, said method all can not be guaranteed the reliability and the fail safe of relaying protection control outlet fully.
In sum; Microcomputer protecting device exists the hardware configuration complicacy in the prior art at present, debugging is loaded down with trivial details, cost is high, can not guarantee reliability and fail safe that relaying protection control exports fully; Especially as many CPU simultaneously during program fleet, can cause that the control outlet is out of control to cause the controlled switch misoperation.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes prior art; Provide that a kind of hardware configuration is simple, debugging is convenient, cost is low, can guarantee the reliability and the fail safe of relaying protection control outlet fully; Even many CPU are program fleets simultaneously, can not cause the control outlet microcomputer protecting device that prevents of controlled switch misoperation that causes out of control to be disturbed the protective circuit with misoperation yet.
The technical scheme that the present invention adopted is: the present invention includes input signal filter circuit, electric source filter circuit and single board computer; Said single board computer includes analog-to-digital conversion input A/D circuit and control input and output I/O interface circuit; It also comprises multistage divide-shut brake relay protection circuit; Said multistage divide-shut brake relay protection circuit comprises anti-interference logic module, multistage divide-shut brake relay; Said analog-to-digital conversion input A/D circuit is connected with said input signal filter circuit, and said single board computer working power obtains through said electric source filter circuit, and said control input and output I/O interface circuit connects said anti-interference logic module; Said anti-interference logic module connects said multistage divide-shut brake relay, the action of said multistage divide-shut brake relay control on-off switch.
Said multistage divide-shut brake relay protection circuit adopts by the method for prime control back level and carries out logic coding control; The prime of said multistage divide-shut brake relay is connected with said anti-interference logic module, and the last level of said multistage divide-shut brake relay is connected with said on-off switch.
The invention has the beneficial effects as follows: because the present invention adopts input signal filter circuit and electric source filter circuit, single board computer and multistage divide-shut brake relay protection circuit; Said single board computer includes analog-to-digital conversion input circuit and control input and output I/O interface circuit; Said analog-to-digital conversion input circuit is connected with said input signal filter circuit; Said single board computer working power obtains through said electric source filter circuit; Said control input and output I/O interface circuit connects said multistage divide-shut brake relay protection circuit; The action of said multistage divide-shut brake relay protection circuit control on-off switch; So hardware configuration of the present invention is simple, debugging is convenient, cost is low, can guarantee the reliability and the fail safe of relaying protection control outlet fully, even many CPU program fleet simultaneously can not cause the control outlet microcomputer protecting device that causes the controlled switch misoperation out of control to prevent to disturb the method with misoperation yet.The present invention is directed to the characteristics that relaying protection control exports, adopt the CPLD technology to combine, successfully develop a kind of method that exports based on the anti-interference Microcomputer Protection control of CPLD with the relay programming.This new method of introducing in the literary composition based on CPLD control interface Anti-interference Design is simpler than multi-CPU structure, more economical; Reliability is higher; Do not rely on the interference free performance of CPU itself, even the CPU program fleet, control interface still has very high anti-interfering performance; Can not produce the mistrip level, thoroughly solve the integrity problem of relaying protection system control outlet.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present invention;
Fig. 2 is a relaying protection control outlet schematic diagram;
Fig. 3 is the CPLD control interface of Microcomputer Protection;
Fig. 4 is two process state logic figure.
Embodiment
Like Fig. 1, Fig. 2, Fig. 3, shown in Figure 4; The present invention includes input signal filter circuit 1, electric source filter circuit 2 and single board computer 3; Said single board computer 3 includes analog-to-digital conversion input A/D circuit 31 and control input and output I/O interface circuit 32; It also comprises multistage divide-shut brake relay protection circuit 4, and said multistage divide-shut brake relay protection circuit 4 comprises anti-interference logic module 41, multistage divide-shut brake relay 42, and said analog-to-digital conversion input A/D circuit 31 is connected with said input signal filter circuit 1; Said single board computer 3 working powers obtain through said electric source filter circuit 2; Said control input and output I/O interface circuit 32 connects said anti-interference logic module 41, and said anti-interference logic module 41 connects said multistage divide-shut brake relay 42, said multistage divide-shut brake relay 42 control on-off switch actions.Said multistage divide-shut brake relay protection circuit 4 adopts by the method for prime control back level and carries out logic coding control; The prime of said multistage divide-shut brake relay 42 is connected with said anti-interference logic module 41, and the last level of said multistage divide-shut brake relay 42 is connected with said on-off switch.
The control interface of microcomputer protection system is made up of I/O interface and midget relay, and typical circuit is that the divide-shut brake relay is divided into two-stage, the first order control second level.The divide-shut brake contactor of second level control major loop.Theory diagram is as shown in Figure 1, and two-step relay helps isolating the interference that the divide-shut brake contactor break-make of major loop produces.The reclosing command execution sequence is: OUT1 → OUT2 → OUT4.The separating brake instruction execution sequence is: OUT1 → OUT3 → OUT4.If the I/O interface is directly by CPU control, when CPU is run by interference program to fly or the CPU chip is out of order and makes the I/O interface out of control, when producing the required level of divide-shut brake just at the right time, malfunction just takes place in relaying protection control outlet inevitably.Therefore, the locking of relaying protection control outlet and redundancy design are the key points that prevents to control the outlet malfunction.The strict execution sequence of keeping watch on the multiple order of divide-shut brake does not allow unordered divide-shut brake order to pass through, and is the essential measure that prevents to control the outlet malfunction.The orderly execution of the multiple order of divide-shut brake can be regarded a state variation sequence as, with the CPLD state machine this status switch is monitored, and just can stop passing through of disordered state, realizes the noiseless control of control outlet.
Anti-interference control interface design based on the CPLD state machine: when designing a high-tension switch cabinet computer integrated protection system based on DSP; Realize I/O interface shown in Figure 2 with the piece of CPLD chip; And design a finite state machine, to state input I1, I2; I3 monitors, and state machine output is as the permission and the inhibit signal of total divide-shut brake order.Microcomputer Protection control interface based on CPLD is as shown in Figure 3.The state encoding of the multiple order of divide-shut brake: state machine has 3 binary system inputs, total 23=8 kind state.Adopt binary coding mode (Binary coded) that the initial condition S0 of control interface is arrived all possible status change, be listed as into a coding schedule, as shown in table 1.The state encoding table is the basis of writing the VHDL program.State machine design: the clock frequency of state machine is 5MHz.Reset signal/Reset is from the systematic reset signal of DSP microcomputer protecting device, to the state initialization of state machine.The design of state machine can be adopted one process, two process, and 3 processes etc. are write, and should adopt two process to describe state machine according to the application characteristic of Microcomputer Protection control interface, i.e. a sequential process and a combination process.The sequential process is responsible for old next state to the new conversion of attitude at present, and asynchronous reset.The combination process is accomplished the variation according to the output of existing attitude decision state machine, and input decides new next state according to state.The logic diagram of two process state machine is as shown in Figure 4.The behavior of state machine and code are a kind of flow process control routines, are easy to realize with CASE statement and IF statement in the VHDL language.Utilize existing attitude signal and next state signal to carry out synchronous communication between sequential process and the combination process.
The anti-interference control principle analysis of CPLD state machine: the microsystem based on CPU is carried out machine instruction by the instruction cycle order, in case overstepped the limit by interference program, then CPU is not according to the flow performing program of finishing in advance; Occur crashing; Common countermeasure is house dog to be set make the CPU hardware reset, makes CPU rerun normal procedure, but generally will experience several milliseconds to 1～2s from the CPU watchdog reset that crashes; This section out-of-control time; The state of relaying protection control outlet is uncertain, is enough to relaying protection system is constituted harm, and malfunction takes place serious situation exactly.And based on the state machine system of CPLD, the state transformation cycle has only a clock cycle, if clock frequency is 5MHz, the clock cycle is 012Ls.If state machine receives disturb to get into illegal state and changes legal state again over to, only need 2 clock cycle, i.e. hundreds of nanosecond, be not enough to that operation works the mischief to state machine system.It is thus clear that, with the control interface of CPLD state machine control microcomputer protective relay, just can realize noiseless control, obtain the High-reliability Control of relaying protection system.CPLD has only digital interface, and voltage is single, little many of the possibility that damaged by external interference.In addition, the CPLD state machine contains a plurality of processes, just is equivalent to include " many CPU " function of concurrent operation, to underproof input, and ruling state machine output 0.The EMp7128SLC84-15 serial with the MAX7000 of altera corp realizes the relaying protection control interface; Directly link to each other with chip bus; CPU carry out to close a floodgate or during the multiple order of separating brake; Need not insert latent period, only need to carry out continuously 3 and close a floodgate or the separating brake instruction, the CPLD state machine just can determine whether allow total fill order to pass through immediately.It is fast that the relaying protection control interface of realizing with CPLD has speed, and it is little to take the hardware volume, and interface is simple, and characteristics such as reliability height have very strong filtering property for the transition interference signal.Though conventional microcomputer protecting device has certain effect from taking precautions against derailed some software measures that adopt of microcomputer protection system program; But the problem out of control of control mouth during really settlement procedure is overstepped the limit; And CPLD state machine control interface has really solved this problem, and the anti-interference control interface that can be applied to various Control Systems of Microcomputer goes.
The present invention can be widely used in Power System Intelligent type computer integrated protection field.
Claims (1)
1. one kind prevents that microcomputer protecting device from being disturbed the protective circuit with misoperation; It comprises input signal filter circuit (1), electric source filter circuit (2) and single board computer (3); Said single board computer (3) includes analog-to-digital conversion input A/D circuit (31) and control input and output I/O interface circuits (32); It is characterized in that: it also comprises multistage divide-shut brake relay protection circuit (4); Said multistage divide-shut brake relay protection circuit (4) comprises anti-interference logic module (41), multistage divide-shut brake relay (42); Said analog-to-digital conversion input A/D circuit (31) is connected with said input signal filter circuit (1), and said single board computer (3) working power obtains through said electric source filter circuit (2), and said control input and output I/O interface circuit (32) connects said anti-interference logic module (41); Said multistage divide-shut brake relay protection circuit (4) adopts by the method for prime control back level and carries out logic coding control; The prime of said multistage divide-shut brake relay (42) is connected with said anti-interference logic module (41), the action of said multistage divide-shut brake relay (42) control on-off switch, and the last level of said multistage divide-shut brake relay (42) is connected with said on-off switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101924379A CN101707351B (en) | 2009-09-18 | 2009-09-18 | Protection circuit for preventing microcomputer protection device against interference and error actions |
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| CN2009101924379A CN101707351B (en) | 2009-09-18 | 2009-09-18 | Protection circuit for preventing microcomputer protection device against interference and error actions |
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| CN101707351B true CN101707351B (en) | 2012-05-30 |
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| CN105320588A (en) * | 2015-05-12 | 2016-02-10 | 南京国电南自电网自动化有限公司 | Delay alarm circuit and method used for relay protective apparatus |
| CN106326055B (en) * | 2016-08-29 | 2019-11-12 | 四川九洲空管科技有限责任公司 | A kind of hardware of airborne collision avoidance system crashes detection and repositioning method |
| CN106848996B (en) * | 2017-03-17 | 2020-02-21 | 云南电网有限责任公司 | Outlet protection method and device suitable for double-CPU structure |
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| CN2133079Y (en) * | 1992-09-06 | 1993-05-12 | 吴铁辉 | Automatic protector for ac. motor |
| CN2152334Y (en) * | 1993-04-03 | 1994-01-05 | 山东省供销社集团新技术开发公司 | Double loop motor protector |
| CN2278294Y (en) * | 1996-12-27 | 1998-04-08 | 中国科学院电工研究所 | AC motor multi-function protective controller for collecting and distributing control system |
| CN2584579Y (en) * | 2002-08-26 | 2003-11-05 | 周沛凝 | Microcomputer control board for construction lift equipment |
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2009
- 2009-09-18 CN CN2009101924379A patent/CN101707351B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2133079Y (en) * | 1992-09-06 | 1993-05-12 | 吴铁辉 | Automatic protector for ac. motor |
| CN2152334Y (en) * | 1993-04-03 | 1994-01-05 | 山东省供销社集团新技术开发公司 | Double loop motor protector |
| CN2278294Y (en) * | 1996-12-27 | 1998-04-08 | 中国科学院电工研究所 | AC motor multi-function protective controller for collecting and distributing control system |
| CN2584579Y (en) * | 2002-08-26 | 2003-11-05 | 周沛凝 | Microcomputer control board for construction lift equipment |
Non-Patent Citations (1)
| Title |
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| 吴伟军等.一起采用SPAD346C微机型变压器差动保护装置误动作案例分析.《继电器》.2007,第35卷165-168. * |
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Address after: 519000, No. 33, No. three road, Tang Wan Town, Zhuhai hi tech Zone, Guangdong, 2 Patentee after: ZHUHAI RADIANCE ELECTRIC CO., LTD. Address before: Tangjiawan hit road 519085 Guangdong city of Zhuhai province No. 1 new economic resources development in Hong Kong Zhuhai regant Electric Co. Ltd. Patentee before: Zhuhai Radiance Electric Co., Ltd. |