CN111030038B - Power system relay protection setting value checking method - Google Patents
Power system relay protection setting value checking method Download PDFInfo
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- CN111030038B CN111030038B CN201911210311.XA CN201911210311A CN111030038B CN 111030038 B CN111030038 B CN 111030038B CN 201911210311 A CN201911210311 A CN 201911210311A CN 111030038 B CN111030038 B CN 111030038B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
Abstract
The invention provides a method for checking a relay protection setting value of a power system. The invention utilizes the computer technology to simulate the single or multiple fault phenomena of the system to verify the reasonability of the relay protection calculation setting value, and provides a correction suggestion, thereby carrying out simulation test on the accuracy of the relay protection setting value calculation.
Description
Technical Field
The invention relates to a method for checking a relay protection setting value of a power system.
Background
In order to meet the requirements of reliability, selectivity, sensitivity and quick action of the action of a relay protection device of a power system, on one hand, the requirement of simple and applicable main electrical wiring mode is required, the type selection of main equipment is reasonable, and the requirements of sampling precision and operation speed of the protection device are also relied on; more importantly, the relay protection setting calculation quality is obtained, if the setting value calculation is not accurate enough, when a fault occurs, not only can the fault point not be removed as soon as possible, but also other types of faults can be caused, so that the fault range is further expanded, and the optimal opportunity for fault treatment is missed.
Under the general condition, limited by field conditions, field debugging work is only to test the action accuracy of a relay protection device monomer under a given fixed value condition, and it is often difficult to verify the matching of a whole set of calculation set values between main protection and backup protection under a fault condition, between near backup and far backup protection, between adjacent main protection or backup protection, and between failure protection and related active branch protection.
Disclosure of Invention
The invention aims to provide a method for verifying a relay protection setting value of a power system.
In order to solve the above problems, the present invention provides a method for calibrating a relay protection setting value of a power system, comprising:
automatically modeling a system according to given parameter conditions of a generator, a transformer, a line and a motor and a system grounding mode;
presetting characteristic conditions of the switch equipment, the current transformer and the voltage transformer according to manufacturer data under the condition of a human-computer interface;
presetting the generator, the phase modulator top value forced excitation multiple and the excitation loop time constant according to manufacturer data under the condition of a human-computer interface;
acquiring technical data of standards, specifications and regulations under the condition of a human-computer interface;
modifying and downloading the relay protection setting values of all relay protection elements on line;
presetting single or multiple faults, wherein the faults have time sequence; presetting the conditions of failure of the main protection and the backup protection of a certain loop and switch failure; presetting short-circuit points and short-circuit forms; presetting system oscillation conditions;
switching on or off one or more protection of a relay protection element;
and under the preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming event sequence records and forming report printing.
Further, in the above method, the characteristic conditions include: switch opening time, rated short-circuit current breaking capacity and performance indexes of a current or voltage transformer.
Further, in the above method, under a preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
the protection action results are analyzed with reference to the protocol specification.
Further, in the above method, under a preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
and calculating the dynamic thermal stability of the primary equipment and the lead.
Further, in the above method, under a preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
and calculating the overcurrent multiple of the current transformer.
Further, in the above method, under a preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
the sensitivity factor of the protective element is analyzed.
Further, in the above method, after automatically performing system modeling according to given parameter conditions of the generator, the transformer, the line, and the motor and a system grounding mode, the method further includes:
after parameter conditions of each element of the scale-making system are input through a human-computer interface, the simulation controller automatically calculates and generates a positive sequence, a negative sequence and a zero sequence network impedance diagram.
Further, in the above method, the one or more protections of a protection element are applied or removed, including:
and inputting relay protection setting values of all protection elements in the system through a human-computer interface, and simulating protection switching or protection releasing, element judging and reclosing modes according to a 'setting order' requirement.
Further, in the above method, under a preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
simulating and inputting working current and voltage of the generator and the phase modulator under the condition of maximum load through an AI interface of the simulation controller, and inputting state information of each switching element in the system through a DI interface;
the simulation system displays the operation parameters, the vector parameters and the impedance parameters of the system in real time in a main wiring diagram;
real-time displaying measurement calculation parameters and directions and locking element starting situations and returning situations in detail diagrams of all protection elements;
simulating various fault types through the PLC auxiliary controller, and inputting the fault types into a DI (direct input) interface of the simulation controller in a DO (data output) form;
verifying the action time sequence coordination between backup protections under the condition that a certain loop switch fails or the main protection fails;
and evaluating the relay protection setting calculation quality by combining the simulation action time sequence and the relay protection related design standard and procedure.
Further, in the above method, under a preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming the sequence record of the event, and forming a report for printing, the method includes:
after receiving a fault form instruction, the simulation controller automatically switches the system into a fault state, cuts off input parameters of an original AI interface, locks operation parameters of the operation system at the time t-1, calculates short-circuit currents, voltages and impedance values of each loop after the time t is 0 according to a generator excitation system wiring mode and factors of a top value forced excitation multiple, a short-circuit point and a capacitor for assisting short-circuit current increase, generates a protection action time sequence according to a preset relay protection setting value, main protection action time, backup protection action time, switch action time and the like, and generates and prints an action time sequence table in an event sequence recording mode.
Compared with the prior art, the method automatically carries out system modeling according to the given parameter conditions of the generator, the transformer, the line and the motor and the system grounding mode; presetting characteristic conditions of the switch equipment, the current transformer and the voltage transformer according to manufacturer data under the condition of a human-computer interface; presetting the generator, the phase modulator top value forced excitation multiple and the excitation loop time constant according to manufacturer data under the condition of a human-computer interface; acquiring technical data of standards, specifications and regulations under the condition of a human-computer interface; modifying and downloading the relay protection setting values of all the protection elements on line; presetting single or multiple faults, wherein the faults have time sequence; presetting the conditions of failure of the main protection and the backup protection of a certain loop and switch failure; presetting short-circuit points and short-circuit forms; presetting system oscillation conditions; one or more protections of a protection element are put in or taken out; and under the preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming event sequence records and forming report printing. The invention utilizes the computer technology to simulate the single or multiple fault phenomena of the system to verify the reasonability of the relay protection calculation setting value, and provides a correction suggestion, thereby carrying out simulation test on the accuracy of the relay protection setting value calculation.
Drawings
Fig. 1 is a diagram of a power system relay protection setting value verification system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In the invention, the system runs symmetrically in three phases under normal conditions, when a fault occurs, magnetic circuits of all elements of the power system are not saturated, the synchronous motors are provided with automatic excitation adjusting devices, and element resistances are omitted except for calculating a short-circuit current attenuation time constant and a low-voltage network short-circuit current.
All protection elements can accurately act under the condition of a given setting value; all protection elements and network equipment are synchronized by GPS, and all switch equipment can be reliably switched on and off according to preset conditions.
The invention provides a method for checking a relay protection setting value of a power system, which comprises the following steps:
step S1, automatically modeling the system according to the given parameter conditions of the generator, the transformer, the line and the motor and the grounding mode of the system;
step S2, under the condition of a human-computer interface, presetting the characteristic conditions of the switch equipment, the current transformer and the voltage transformer according to the manufacturer data;
step S3, presetting the generator, the phase modulator top value forced excitation multiple and the excitation loop time constant according to the manufacturer data under the condition of a human-computer interface;
step S4, acquiring technical data of standard, standard and regulation under the condition of human-computer interface;
step S5, modifying and downloading the relay protection setting values of the protection elements on line;
step S6, presetting a single fault or multiple faults, wherein the faults have time sequence; presetting the conditions of failure of the main protection and the backup protection of a certain loop and switch failure; presetting short-circuit points and short-circuit forms; presetting system oscillation conditions;
step S7, switching on or off one or more protection of a relay protection element;
and step S8, calculating the short-circuit current under the preset condition, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming a Sequence of events (SOE) and forming a report for printing.
The invention utilizes the computer technology to simulate the single or multiple fault phenomena of the system to verify the reasonability of the relay protection calculation setting value, and provides a correction suggestion, thereby carrying out simulation test on the accuracy of the relay protection setting value calculation.
The invention is applicable to thermal power plants, hydroelectric power plants, photovoltaic power plants, wind power plants, and other forms of power plants; the method is suitable for hubs and terminal substations; the method is suitable for analyzing the action condition of the first line of defense of the power system; under the expansion condition, the method can be used for analyzing the second and third defense line action conditions of the power system; analyzing a secondary fault under the switching condition; the method is suitable for analyzing the action condition under the fault condition of the direct current system.
In an embodiment of the method for checking the relay protection setting value of the power system, the characteristic conditions include: switch opening time, rated short-circuit current breaking capacity and performance indexes of a current or voltage transformer.
In an embodiment of the method for checking a relay protection setting value of a power system, in step S8, under a preset condition, calculating a short-circuit current, simulating a protection action according to a calculation result and a setting value of a protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
the protection action results are analyzed with reference to the protocol specification.
In an embodiment of the method for checking a relay protection setting value of a power system, in step S8, under a preset condition, calculating a short-circuit current, simulating a protection action according to a calculation result and a setting value of a protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
and calculating the dynamic thermal stability of the primary equipment and the lead.
In an embodiment of the method for checking a relay protection setting value of a power system, in step S8, under a preset condition, calculating a short-circuit current, simulating a protection action according to a calculation result and a setting value of a protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
and calculating the overcurrent multiple of the current transformer.
In an embodiment of the method for checking a relay protection setting value of a power system, in step S8, under a preset condition, calculating a short-circuit current, simulating a protection action according to a calculation result and a setting value of a protection element, automatically forming an event sequence record, and forming a report for printing, the method further includes:
the sensitivity factor of the protective element is analyzed.
In an embodiment of the method for checking the relay protection setting value of the power system, in step S1, after automatically performing system modeling according to given parameter conditions of the generator, the transformer, the line and the motor and a system grounding mode, the method further includes:
after parameter conditions of each element of the scale-making system are input through a human-computer interface, the simulation controller automatically calculates and generates a positive sequence, a negative sequence and a zero sequence network impedance diagram.
In an embodiment of the method for checking the setting value of the relay protection in the power system, in step S7, switching on or off one or more protection of a protection element includes:
and inputting relay protection setting values of all protection elements in the system through a human-computer interface, and simulating protection switching or protection releasing, element judging and reclosing modes according to a 'setting order' requirement.
In an embodiment of a method for checking a relay protection setting value of a power system, after calculating a short-circuit current under a preset condition, performing protection action simulation according to a calculation result and a setting value of a protection element, automatically forming an event sequence record, forming a report, and printing, the method further includes:
simulating and inputting working current and voltage of the generator and the phase modifier under the maximum load condition (or other load conditions) through an AI interface of the simulation controller, and inputting state information of each switching element in the system through a DI interface;
the simulation system displays the operation parameters, the vector parameters and the impedance parameters of the system in real time in a main wiring diagram;
real-time displaying measurement calculation parameters and directions and locking element starting situations and returning situations in detail graphs of all relay protection elements;
simulating various fault types through the PLC auxiliary controller, and inputting the fault types into a DI (direct input) interface of the simulation controller in a DO (data output) form;
verifying the action time sequence coordination between backup protections under the condition that a certain loop switch fails or the main protection fails;
and evaluating the relay protection setting calculation quality by combining the simulation action time sequence and the relay protection related design standard and procedure.
In an embodiment of a method for checking a relay protection setting value of a power system, short-circuit current calculation is performed under a preset condition, protection action simulation is performed according to a calculation result and a setting value of a protection element, event sequence records are automatically formed, and report printing is formed, and the method comprises the following steps:
after receiving a fault form instruction, the simulation controller automatically switches the system into a fault state, cuts off input parameters of an original AI interface, locks operation parameters of the operation system at a time t-1, calculates short-circuit current, voltage and impedance values of each loop after the time t is 0 according to a generator excitation system wiring mode and factors of a top value forced excitation multiple, a short-circuit point and a capacitor for assisting short-circuit current increase, generates a protection action time sequence according to a preset relay protection setting value, main protection action time, backup protection action time, switch action time and the like, and generates and prints an action time sequence table in an SOE (sequence of event) form.
As shown in fig. 1, the system of the present invention may comprise: the system comprises an engineer station (comprising a computer, a printer, a GPS (global positioning system), remote terminal equipment and the like), network equipment, a simulation controller (comprising a substation CPU (central processing unit), an I/O (input/output) module, a power supply module and the like), a PLC (programmable logic controller) auxiliary controller and a relay protection tester.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for checking a relay protection setting value of a power system is characterized by comprising the following steps:
automatically modeling a system according to given parameter conditions of a generator, a transformer, a line and a motor and a system grounding mode;
presetting characteristic conditions of switch equipment, a power transformer and a current and voltage transformer according to manufacturer data under the condition of a human-computer interface;
presetting a generator, a phase modulator, a top value forced excitation multiple and an excitation loop time constant of the generator and the phase modulator according to manufacturer data under the condition of a human-computer interface;
acquiring technical data of national and industrial standards, specifications and regulations under the condition of a human-computer interface;
modifying and downloading the relay protection setting values of all relay protection elements on line;
presetting single or multiple faults, wherein the faults have time sequence; presetting the conditions of failure of the main protection and the backup protection of a certain loop and switch failure; presetting short-circuit points and short-circuit forms; presetting system oscillation conditions;
switching on or off one or more protection of a relay protection element;
under the preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming event sequence records and forming a report to print;
under the preset condition, calculating the short-circuit current, simulating the protection action according to the calculation result and the setting value of the protection element, automatically forming the sequence record of events, forming a report and printing, and further comprising:
simulating and inputting working current and voltage of the generator and the phase modulator under the condition of maximum load through an AI interface of the simulation controller, and inputting state information of each switching element in the system through a DI interface;
the simulation system displays the operation parameters, the vector parameters and the impedance parameters of the system in real time in a main wiring diagram;
displaying measurement calculation parameters, directions and locking element starting conditions and returning conditions in real time in each relay protection element detail diagram;
simulating various fault types through the PLC auxiliary controller, and inputting the fault types into a DI (direct input) interface of the simulation controller in a DO (data output) form;
verifying the action time sequence coordination between backup protections under the condition that a certain loop switch fails or the main protection fails;
and evaluating the relay protection setting calculation quality by combining the simulation action time sequence and the relay protection related design standard and procedure.
2. The method for checking the relay protection setting value of the power system according to claim 1, wherein the characteristic conditions include: the switch action time, rated short-circuit current breaking capacity and performance indexes of a current or voltage transformer.
3. The method for checking the relay protection setting value of the power system according to claim 1, wherein, under a preset condition, the short-circuit current is calculated, the protection action simulation is performed according to the calculation result and the setting value of the protection element, and after the event sequence record is automatically formed and the report is printed, the method further comprises:
and analyzing the protection action result according to the rule specification.
4. The method for checking the relay protection setting value of the power system according to claim 1, wherein, under a preset condition, the short-circuit current is calculated, the protection action simulation is performed according to the calculation result and the setting value of the protection element, and after the event sequence record is automatically formed and the report is printed, the method further comprises:
and calculating the dynamic thermal stability of the primary equipment and the lead.
5. The method for checking the relay protection setting value of the power system according to claim 1, wherein, under a preset condition, the short-circuit current is calculated, the protection action simulation is performed according to the calculation result and the setting value of the protection element, and after the event sequence record is automatically formed and the report is printed, the method further comprises:
and calculating the overcurrent multiple of the current transformer.
6. The method for checking the relay protection setting value of the power system according to claim 1, wherein, under a preset condition, the short-circuit current is calculated, the protection action simulation is performed according to the calculation result and the setting value of the protection element, and after the event sequence record is automatically formed and the report is printed, the method further comprises:
the sensitivity factor of the protective element is analyzed.
7. The method for calibrating the setting value of the relay protection in the power system according to claim 1, wherein after the system modeling is automatically performed according to given parameter conditions of the generator, the transformer, the line and the motor and a system grounding mode, the method further comprises:
after parameter conditions of each element of the scale-making system are input through a human-computer interface, the simulation controller automatically calculates and generates a positive sequence, a negative sequence and a zero sequence network impedance diagram.
8. The method for checking the relay protection setting value of the power system according to claim 1, wherein switching on or off one or more protections of a relay protection element comprises:
and inputting relay protection setting values of all protection elements in the system through a human-computer interface, and simulating protection switching or protection releasing, element judging and reclosing modes according to a 'setting order' requirement.
9. The method for checking the relay protection setting value of the power system according to claim 1, wherein short-circuit current calculation is performed under a preset condition, protection action simulation is performed according to a calculation result and the setting value of the protection element, event sequence records are automatically formed, and report printing is formed, and the method comprises the following steps:
after receiving a fault form instruction, the simulation controller automatically switches the system into a fault state, cuts off input parameters of an original AI interface, locks operation parameters of the operation system at a time t-1, calculates short-circuit current, voltage and impedance values of each loop after the time t is 0 according to a generator excitation system wiring mode and factors of a top value forced excitation multiple, a short-circuit point and a capacitor for assisting short-circuit current increase, generates a protection action time sequence according to a preset relay protection setting value, main protection action time, backup protection action time and switch action time, and generates and prints an action time sequence table in an event sequence recording mode.
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