CN109616998B - Method for judging and processing voltage inconsistency of relay protection device based on double CPU sampling - Google Patents
Method for judging and processing voltage inconsistency of relay protection device based on double CPU sampling Download PDFInfo
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- CN109616998B CN109616998B CN201811568014.8A CN201811568014A CN109616998B CN 109616998 B CN109616998 B CN 109616998B CN 201811568014 A CN201811568014 A CN 201811568014A CN 109616998 B CN109616998 B CN 109616998B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
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- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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Abstract
The invention discloses a method for judging and processing inconsistent voltage of a relay protection device based on double CPU sampling, which comprises the following steps: judging whether a relay protection device is started or not; the digital sampling device enters a judging step of inconsistent sampling of double CPU voltages; the digital sampling device firstly judges whether error marks exist in the voltage sampling of the main CPU and the slave CPU, and then judges whether the voltage sampling of the double CPUs is inconsistent; and processing logic steps after the voltage sampling of the double CPUs is inconsistent. The invention fully utilizes the voltage sampling information of the slave CPU, avoids the misoperation of voltage-related protection action elements caused by the voltage sampling abnormity of the master CPU, and improves the reliability of the relay protection device.
Description
Technical Field
The invention relates to a method for judging and processing voltage inconsistency of a relay protection device based on double CPU sampling, and belongs to the technical field of relay protection of power systems.
Background
The relay protection device is an important component of the power system and is one of important measures for protecting the safe operation of the power system. With the development of relay protection devices and the improvement of requirements on the stability of a power grid, the high-voltage relay protection devices mostly adopt a master-slave dual-CPU mode at present, and master-slave CPUs sample simultaneously to increase the sampling reliability, so that the phenomenon of misoperation of the devices after a single CPU samples a problem is prevented. The typical practice of the current relay protection device based on double CPUs is as follows: the AC analog quantity is respectively introduced into the AD modules in the two CPUs and is respectively converted by the independent data sampling circuits, wherein the data of the AD module in the protection CPU is sent to the protection to complete the protection function, and the AD module in the starting CPU and the starting circuit of the protection CPU form an open circuit of the starting relay in a logic AND mode. Only when the two AD start at the same time, the protection can be exported. The method is simple and convenient, but the data resource sampled by the double CPUs is not fully utilized, and when the main CPU has abnormal sampling, the protection misoperation is easily caused. One situation is: when the voltage sampling of the main CPU is abnormal but the voltage alarm or locking protection condition of the protection device is not met, if system disturbance occurs at the moment, malfunction of a certain voltage related protection element can be caused after the device is started.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to fully utilize data resources sampled by a master CPU and a slave CPU to solve the problem of unreliable protection action possibly caused by abnormal voltage sampling when only the master CPU is used for sampling. The invention aims to avoid the similar situation, two paths of different sampling data are adopted by the relay protection device, when the sampling of the master CPU and the sampling of the slave CPU are inconsistent, the relay protection device alarms and takes measures, related protection functions are reasonably reserved or quitted, protection misoperation is prevented, and the reliability of the relay protection device is improved.
The invention provides a method for judging and processing inconsistent voltage of a relay protection device based on double CPU sampling, which comprises the following steps:
judging whether a relay protection device is started or not;
the non-digital sampling device enters a judging step of inconsistent sampling of double CPU voltages;
the digital sampling device firstly judges whether error marks exist in the voltage sampling of the main CPU and the slave CPU, and then judges whether the voltage sampling of the double CPUs is inconsistent;
and processing logic steps after the voltage sampling of the double CPUs is inconsistent.
As a preferred embodiment, the step of determining whether the relay protection device is started specifically includes: and judging whether the relay protection device is started, if so, entering a protection action logic, and judging whether the voltage sampling of the double CPUs is consistent no longer in the starting process of the relay protection device, otherwise, judging whether the relay protection device is a digital sampling device.
As a preferred embodiment, the step of determining the inconsistency of the voltage sampling of the non-digital sampling apparatus into the dual CPU specifically includes: if the relay protection device is not started, the step of judging the sampling inconsistency of the double CPU voltages is directly carried out on the non-digital sampling device.
As a preferred embodiment, the step of determining the voltage sampling inconsistency of the digital sampling apparatus specifically includes: if the relay protection device is not started, the digitalized sampling device needs to judge whether the voltage sampling of the master CPU and the slave CPU has error marks, if the voltage sampling of the master CPU and the slave CPU has no error marks, the process of judging inconsistency of voltage sampling of the double CPUs is entered, and if not, a sampling error alarm is output.
As a preferred embodiment, the step of determining whether the voltage sampling of the master CPU and the slave CPU has the error flag specifically includes: the sampling data of the master CPU and the slave CPU are invalid; interrupting a sampling channel; the sampling channel is out of step; voltage sampling and overhauling are inconsistent; if one of the above 4 conditions is satisfied, an error flag is set.
As a preferred embodiment, the step of determining inconsistency of voltage sampling of the dual CPUs includes: the main CPU obtains a voltage sampling value of the slave CPU through a high-speed bus, calculates sampling voltage fundamental wave vector values of the main CPU and the slave CPU respectively, then judges whether a mode value of a voltage vector difference of the main CPU and the slave CPU is larger than a set threshold value or not, and if the mode value is larger than the set threshold value, delays for 5 seconds to judge that voltage sampling of the double CPUs is inconsistent.
As a preferred embodiment, the step of determining inconsistency of voltage sampling of the dual CPUs specifically includes:
respectively calculating three-phase sampling voltage fundamental wave vector values of a main CPU and a slave CPU;
respectively calculating whether the vector difference mode value of each phase voltage of the main CPU and the slave CPU is larger than a set threshold value, wherein the specific discriminant formula is as follows:
{|Ua-UaQ|＞Max(0.1Un,Ua/4,UaQ/4)}||
{|Ub-UbQ|＞Max(0.1Un,Ub/4,UbQ/4)}||
{|Uc-UcQ|＞Max(0.1Un,Uc/4,UcQ/4)}
wherein, Ua、UaQA phase voltage vector value, U, sampled for the master CPU and slave CPU respectivelyb、UbQB-phase voltage vector value, U, sampled for master CPU and slave CPU respectivelyc、UcQC-phase voltage vector value, U, sampled for master CPU and slave CPU respectivelynIs a rated voltage.
In a preferred embodiment, the processing logic after the sampling inconsistency of the dual CPUs voltage is as follows: and delaying for 5s after the judgment condition of the inconsistency of the double CPU voltage sampling is met, sending out related alarm information by the relay protection device, simultaneously carrying out PT disconnection logic processing by the relay protection device, locking a protection element related to the voltage quantity, and if the judgment condition is not met, delaying for 1s and then returning to the judgment step whether the relay protection device is started or not.
The invention achieves the following beneficial effects: first, the present invention is directed to how to fully utilize the data resources sampled by the master-slave dual CPU to solve the problem of voltage sampling abnormality occurring when only the master CPU is used for sampling, the technical problem of unreliable action protection can be caused, and by sampling the relay protection device based on the double CPU, under the premise that the relay protection device is not started, the main CPU obtains a voltage sampling value of the slave CPU through a high-speed bus, calculates a fundamental wave vector value of the sampling voltage of the main CPU and the slave CPU respectively, then, the consistency of the double CPU voltage sampling data is judged according to the vector difference of the master CPU voltage sampling data and the slave CPU voltage sampling data, if the double CPU voltage sampling is inconsistent, a corresponding alarm is issued and processed according to PT disconnection logic, the protection element related to the voltage quantity is locked, for the digital sampling device, firstly, whether the sampling data are effective is judged, and the influence of misjudgment of invalid data on protection logic under the condition of meeting inconsistent criteria is prevented; secondly, the invention makes full use of the voltage sampling information of the slave CPU, and avoids the voltage related protection action element misoperation caused by the abnormal voltage sampling of the master CPU, thereby improving the reliability of the relay protection device.
Drawings
Fig. 1 is an overall flowchart of a method for judging and processing voltage inconsistency of a relay protection device based on dual-CPU sampling according to the present invention.
FIG. 2 is a flowchart of the dual CPU voltage sampling inconsistency judging step of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows an overall flowchart of a method for determining voltage inconsistency of a relay protection device based on dual-CPU sampling according to the present invention, where the method includes the following four steps.
Step SS 1: judging whether a relay protection device is started or not; the step of judging whether the relay protection device is started specifically comprises the following steps: and judging whether the relay protection device is started, if so, entering a protection action logic, and judging whether the voltage sampling of the double CPUs is consistent no longer in the starting process of the relay protection device, otherwise, judging whether the relay protection device is a digital sampling device.
Step SS 2: the non-digital sampling device enters a judging step of inconsistent sampling of double CPU voltages; the step of judging whether the voltage sampling of the non-digital sampling device is inconsistent in the double CPU voltage sampling specifically comprises the following steps: if the relay protection device is not started, the step of judging the sampling inconsistency of the double CPU voltages is directly carried out on the non-digital sampling device.
Step SS 3: the digital sampling device firstly judges whether error marks exist in the voltage sampling of the main CPU and the slave CPU, and then judges whether the voltage sampling of the double CPUs is inconsistent.
As a preferred embodiment, the step of determining the voltage sampling inconsistency of the digital sampling apparatus specifically includes: if the relay protection device is not started, the digitalized sampling device needs to judge whether the voltage sampling of the master CPU and the slave CPU has error marks, if the voltage sampling of the master CPU and the slave CPU has no error marks, the process of judging inconsistency of voltage sampling of the double CPUs is entered, and if not, a sampling error alarm is output.
As a preferred embodiment, the step of determining whether the voltage sampling of the master CPU and the slave CPU has the error flag specifically includes: the sampling data of the master CPU and the slave CPU are invalid; interrupting a sampling channel; the sampling channel is out of step; voltage sampling and overhauling are inconsistent; if one of the above 4 conditions is satisfied, an error flag is set.
As a preferred embodiment, the step of determining inconsistency of voltage sampling of the dual CPUs includes: the main CPU obtains a voltage sampling value of the slave CPU through a high-speed bus, calculates sampling voltage fundamental wave vector values of the main CPU and the slave CPU respectively, then judges whether a mode value of a voltage vector difference of the main CPU and the slave CPU is larger than a set threshold value or not, and if the mode value is larger than the set threshold value, delays for 5 seconds to judge that voltage sampling of the double CPUs is inconsistent.
As shown in fig. 2, a flowchart of the determination step of the inconsistency of dual-CPU voltage sampling according to the present invention is shown, and as a preferred embodiment, the determination step of the inconsistency of dual-CPU voltage sampling specifically includes:
respectively calculating three-phase sampling voltage fundamental wave vector values of a main CPU and a slave CPU;
respectively calculating whether the vector difference mode value of each phase voltage of the main CPU and the slave CPU is larger than a set threshold value, wherein the specific discriminant formula is as follows:
{|Ua-UaQ|＞Max(0.1Un,Ua/4,UaQ/4)}||
{|Ub-UbQ|＞Max(0.1Un,Ub/4,UbQ/4)}||
{|Uc-UcQ|＞Max(0.1Un,Uc/4,UcQ/4)}
wherein, Ua、UaQA phase voltage vector value, U, sampled for the master CPU and slave CPU respectivelyb、UbQB-phase voltage vector value, U, sampled for master CPU and slave CPU respectivelyc、UcQC-phase voltage vector value, U, sampled for master CPU and slave CPU respectivelynIs a rated voltage.
Step SS 4: and processing logic steps after the voltage sampling of the double CPUs is inconsistent. In a preferred embodiment, the processing logic after the sampling inconsistency of the dual CPUs voltage is as follows: after the judgment condition of the inconsistent sampling of the double CPUs is met, delaying for 5s, and then carrying out relay protectionSending out related alarm information, simultaneously processing by a relay protection device according to PT disconnection logic, locking a protection element related to voltage, and delaying 1 if the condition is not metsAnd then returning to the judging step whether the relay protection device is started or not.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The method for judging and processing the voltage inconsistency of the relay protection device based on double CPU sampling is characterized by comprising the following steps of: judging whether a relay protection device is started or not; the non-digital sampling device enters a judging step of inconsistent sampling of double CPU voltages; the digital sampling device firstly judges whether error marks exist in the voltage sampling of the main CPU and the slave CPU, and then judges whether the voltage sampling of the double CPUs is inconsistent; the judging step of the inconsistency of the double CPU voltage sampling comprises the following steps: the method comprises the steps that a main CPU obtains a voltage sampling value of a slave CPU through a high-speed bus, sampling voltage fundamental wave vector values of the main CPU and the slave CPU are respectively calculated, then whether a mode value of a voltage vector difference of the main CPU and the slave CPU is larger than a set threshold value or not is judged, and if the mode value is larger than the set threshold value, 5 seconds are delayed to judge that voltage sampling of double CPUs is inconsistent; the step of judging the inconsistency of the double CPU voltage sampling specifically comprises the following steps: respectively calculating three-phase sampling voltage fundamental wave vector values of a main CPU and a slave CPU; respectively calculating whether the vector difference mode value of each phase voltage of the main CPU and the slave CPU is larger than a set threshold value, wherein the specific discriminant formula is as follows:
{|Ua-UaQ|＞Max(0.1Un,Ua/4,UaQ/4)}||
{|Ub-UbQ|＞Max(0.1Un,Ub/4,UbQ/4)}||
{|Uc-UcQ|＞Max(0.1Un,Uc/4,UcQ/4)}
wherein, Ua、UaQRespectively sampling for master CPU and slave CPUA-phase voltage vector value, U, of a sampleb、UbQB-phase voltage vector value, U, sampled for master CPU and slave CPU respectivelyc、UcQC-phase voltage vector value, U, sampled for master CPU and slave CPU respectivelynIs a rated voltage;
and processing logic steps after the voltage sampling of the double CPUs is inconsistent.
2. The method for judging and processing the voltage inconsistency of the relay protection device based on the dual-CPU sampling according to claim 1, wherein the step of judging whether the relay protection device is started specifically comprises the steps of: and judging whether the relay protection device is started, if so, entering a protection action logic, and judging whether the voltage sampling of the double CPUs is consistent no longer in the starting process of the relay protection device, otherwise, judging whether the relay protection device is a digital sampling device.
3. The method for judging and processing the voltage inconsistency of the relay protection device based on the dual-CPU sampling according to claim 1, wherein the step of judging the voltage inconsistency of the dual-CPU when the non-digital sampling device enters the dual-CPU sampling specifically comprises the following steps: if the relay protection device is not started, the step of judging the sampling inconsistency of the double CPU voltages is directly carried out on the non-digital sampling device.
4. The method for judging and processing the voltage inconsistency of the relay protection device based on the dual-CPU sampling according to claim 1, wherein the step of judging the voltage inconsistency of the digital sampling device specifically comprises the steps of: if the relay protection device is not started, the digitalized sampling device needs to judge whether the voltage sampling of the master CPU and the slave CPU has error marks, if the voltage sampling of the master CPU and the slave CPU has no error marks, the process of judging inconsistency of voltage sampling of the double CPUs is entered, and if not, a sampling error alarm is output.
5. The method for judging and processing the voltage inconsistency of the relay protection device based on the dual-CPU sampling according to claim 1, wherein the step of judging whether the voltage sampling of the master CPU and the voltage sampling of the slave CPU have the error signs specifically comprises the steps of: the sampling data of the master CPU and the slave CPU are invalid; interrupting a sampling channel; the sampling channel is out of step; voltage sampling and overhauling are inconsistent; if one of the above 4 conditions is satisfied, an error flag is set.
6. The method for judging and processing the voltage inconsistency of the relay protection device based on the dual-CPU sampling according to claim 1, wherein the processing logic after the voltage sampling inconsistency of the dual CPUs is as follows: and delaying for 5s after the judgment condition of the inconsistency of the double CPU voltage sampling is met, sending out related alarm information by the relay protection device, simultaneously carrying out PT disconnection logic processing by the relay protection device, locking a protection element related to the voltage quantity, and if the judgment condition is not met, delaying for 1s and then returning to the judgment step whether the relay protection device is started or not.
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