Blast furnace substation power distribution protection device simulation method

Abstract

The application discloses a simulation method for power distribution protection devices of a blast furnace substation, and relates to the technical field of power systems. The method constructs a simulation time sequence table for the power distribution protection devices of the blast furnace substation, establishes a record for each monitoring object of the power distribution protection devices in the simulation time sequence table, then obtains real-time currents and real-time voltages monitored by each online monitoring and control device of the blast furnace substation every certain time interval, and calculates real-time calculation values of each monitoring object of the power distribution protection devices according to the real-time currents and real-time voltages monitored by each online monitoring and control device. The simulation time sequence table is updated according to the calculation results, and the power distribution protection devices of the blast furnace substation are simulated and tested by using the updated simulation time sequence table.

Description

Technical Field

[0001] This invention relates to power system technology, and in particular to a simulation method for a power distribution protection device in a blast furnace substation. Background Technology

[0002] Blast furnace equipment operates by connecting to the power supply busbar via circuit breakers, using high-voltage power supply and having dedicated power distribution circuits or substations. Its load characteristics include high current, high voltage, large starting current, high harmonic content, and long operating duration. Blast furnace equipment is equipped with several online monitoring and control devices to monitor the real-time voltage and current at detection points, providing data for the power distribution protection devices to perform protection calculations.

[0003] The power distribution protection devices for blast furnace substations must consider overcurrent and overvoltage protection as well as harmonic protection to prevent accidents caused by erroneous power outages and the escalation of faults. Each protection device includes various types of protection such as current-type, voltage-type, and angle-type protection. Each protection device will go through three processes under the protection setting conditions: start-up, operation, and output operation mechanism.

[0004] Simulating the power distribution protection devices in blast furnace substations can verify whether the protection devices can operate correctly during faults and reduce false trips during normal operation, playing a significant role in dispatcher training. However, existing power distribution protection device simulation methods rely on manual, experience-based parameter setting. Since the power distribution protection requirements of blast furnace equipment vary across different operating periods and times, frequent changes to simulation parameter values ​​are necessary to conduct power distribution protection simulation tests for various time periods and times, making simulation testing very inconvenient. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a simulation method for power distribution protection devices in blast furnace substations that can facilitate simulation testing of power distribution protection in blast furnace substations.

[0006] To solve the above-mentioned technical problems, the present invention provides a simulation method for a power distribution protection device in a blast furnace substation, characterized by the following specific steps:

[0007] 1) Obtain each monitored object of the power distribution protection device of the blast furnace substation;

[0008] 2) Construct a simulation timing table for the power distribution protection device of the blast furnace substation, and create a record for each monitoring object of the power distribution protection device in the simulation timing table. Each record in the simulation timing table contains the attribute values ​​of the monitoring object.

[0009] 3) At intervals of T, acquire the real-time current and real-time voltage monitored by each online measurement and control device in the blast furnace substation, and calculate the real-time values ​​of each monitored object required for the simulation timing table of the power distribution protection device based on the real-time current and real-time voltage monitored by each online measurement and control device.

[0010] 4) Update each record in the simulation timing table of the power distribution protection device of the blast furnace substation based on the real-time calculated values ​​of each monitored object, the real-time current and voltage monitored by each online measurement and control device, and the output delay time and action time of the output action actuator of each monitored object.

[0011] 5) Using the simulation timing table updated in step 4), perform simulation tests on the power distribution protection device of the blast furnace substation.

[0012] The simulation method for power distribution protection devices in blast furnace substations provided by this invention calculates the real-time monitoring values ​​of each monitored object of the power distribution protection device based on the real-time current and real-time voltage monitored by each online measurement and control device in the blast furnace substation. It then updates the simulation timing table of the power distribution protection device in the blast furnace substation based on the calculated values ​​and the output delay time and action time of the output action actuators of each monitored object. This allows for real-time updates of various simulation test parameters based on collected information, improving the applicability of protection simulation and facilitating power distribution protection simulation testing in blast furnace substations. Detailed Implementation

[0013] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. However, these embodiments are not intended to limit the present invention. Any similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all indicate the relationship between and. The English letters in the present invention are case-sensitive.

[0014] The simulation method for a power distribution protection device in a blast furnace substation provided in this embodiment of the invention is characterized by the following specific steps:

[0015] 1) Obtain each monitored object of the power distribution protection device of the blast furnace substation;

[0016] 2) Construct a simulation timing table for the power distribution protection device of the blast furnace substation, and create a record for each monitoring object of the power distribution protection device in the simulation timing table. Each record in the simulation timing table contains the attribute values ​​of the monitoring object.

[0017] The attribute values ​​of the monitored object include: monitored object name, object type, exit delay time, comparison expression, reference value, action time, pressure plate input, whether it refuses to act, processing object, processing value, reference value action date;

[0018] There are four possible values ​​for the object type: current, voltage, angle, impedance, or distance. If the object type is current, it indicates that the monitored object is the current acquisition point of the blast furnace. If the object type is voltage, it indicates that the monitored object is the bus voltage acquisition point of the blast furnace. If the object type is angle, it indicates that the monitored object is the voltage and current phase angle calculation point of the blast furnace. If the object type is impedance or distance, it indicates that the monitored object is a calculation point. A calculation point is a vector value containing amplitude and angle calculated by dividing the A-phase current by the A-phase voltage, or by dividing the B-phase current by the B-phase voltage, or by dividing the C-phase current by the C-phase voltage.

[0019] The output delay time refers to the delay time after the power distribution protection device issues a command to perform a protection action on the monitored object, and the actuator performs the protection action on the monitored object. For example, if the output delay time value is n milliseconds, it means that the actuator performs the protection action on the monitored object after a delay of n milliseconds. If n is 0, it means that the actuator performs the action instantly.

[0020] A comparison expression is a relational expression composed of regular relational operators and their corresponding comparison values;

[0021] The reference value is a preset protection value for the monitored object;

[0022] The action time is the duration for implementing the reference value of the monitored object. If it is an instantaneous protection, the action time is set to 0.

[0023] There are two values ​​for the pressure plate input, which indicate whether this record is input during the simulation process;

[0024] The value of "Refuse to Operate" has two values, which indicate whether the protection simulated in this record will refuse an exit action if the conditions are met.

[0025] The processing object is used to identify the circuit breaker corresponding to the protection output action simulated in this record;

[0026] The processing value has two values, which represent the two running states of the processed object;

[0027] The reference value action date is the date on which the reference value is used;

[0028] 3) At intervals of T, acquire the real-time current and real-time voltage monitored by each online measurement and control device in the blast furnace substation, and calculate the real-time values ​​of each monitored object required for the simulation timing table of the power distribution protection device based on the real-time current and real-time voltage monitored by each online measurement and control device.

[0029] 4) Update each record in the simulation timing table of the power distribution protection device of the blast furnace substation based on the real-time calculated values ​​of each monitored object, the real-time current and voltage monitored by each online measurement and control device, and the output delay time and action time of the output action actuator of each monitored object.

[0030] 5) Using the simulation timing table updated in step 4), perform simulation tests on the power distribution protection device of the blast furnace substation.

Claims

1. A simulation method for power distribution protection devices in blast furnace substations, characterized in that, The specific steps are as follows: 1) Obtain each monitored object of the power distribution protection device of the blast furnace substation; 2) Construct a simulation timing table for the power distribution protection device of the blast furnace substation, and create a record for each monitoring object of the power distribution protection device in the simulation timing table. Each record in the simulation timing table contains the attribute values ​​of the monitoring object. The attribute values ​​of the monitored object include: monitored object name, object type, exit delay time, comparison expression, reference value, action time, pressure plate input, whether it refuses to act, processing object, processing value, reference value action date; 3) At intervals of T, acquire the real-time current and real-time voltage monitored by each online measurement and control device in the blast furnace substation, and calculate the real-time values ​​of each monitored object required for the simulation timing table of the power distribution protection device based on the real-time current and real-time voltage monitored by each online measurement and control device. 4) Update each record in the simulation timing table of the power distribution protection device of the blast furnace substation based on the real-time calculated values ​​of each monitored object, the real-time current and voltage monitored by each online measurement and control device, and the output delay time and action time of the output action actuator of each monitored object. 5) Using the simulation timing table updated in step 4), perform simulation tests on the power distribution protection device of the blast furnace substation.