CN103743938B - Busbar voltage wire examination method - Google Patents

Abstract

The bus voltage assessment method relates to a monitoring method for grid bus voltage exceeding the limit. In the traditional bus voltage monitoring, each bus is monitored separately. When the voltage of the parallel bus changes synchronously or exceeds the limit, multiple repeated and invalid alarms will be generated, which will interfere with the monitoring and operation of the dispatcher. The present invention comprises the following steps: use parallel busbars of the same factory station and the same voltage level as a virtual assessment busbar; obtain the line voltage value of the busbar; Outage bus; after filtering out outage bus, check the remaining bus, when the line voltage of the bus is between the set maximum and minimum, it is considered normal, otherwise it is considered to exceed the limit, the bus of the parallel bus of the same voltage level in the same plant If the voltage exceeds the limit, only one alarm needs to be reported. This technical solution reduces the interference caused by invalid alarms, and provides effective technical support for operation monitoring personnel to better monitor the bus voltage.

Description

bus voltage assessment method

technical field

The invention relates to a monitoring method for a grid bus voltage exceeding a limit.

Background technique

The busbar is an important device for collecting, distributing and transmitting electric energy in the power system, and the operating voltage of the busbar directly reflects the operation of the busbar. The traditional bus voltage monitoring method does not take into account the voltage characteristics between parallel buses of the same voltage level in the same plant, but monitors each bus separately. The defect is that when the voltage of the parallel bus changes synchronously and exceeds the limit, multiple Repeated, ineffective alerts that interfere with dispatcher monitoring and operations.

Contents of the invention

The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, provide a bus voltage assessment method, and achieve the purpose of integrating repeated and invalid alarm information. For this reason, the present invention takes the following technical solutions.

The bus voltage assessment method is characterized in that it includes the following steps:

1) The parallel busbars of the same plant station and the same voltage level are used as a virtual assessment busbar;

2) Obtain the line voltage value of the bus;

3) When the line voltage of the bus is less than the outage set value, the bus is considered out of service, and the outage bus is filtered out;

4) After filtering out the outage busbars, check the remaining busbars. When the line voltage of the busbars is between the set maximum and minimum values, it is considered normal; Only one alarm needs to be reported.

By setting the method of virtual assessment bus, the parallel bus of the same voltage level in the same plant is virtualized as a virtual assessment bus. It is not necessary to monitor multiple buses of the same voltage level in the same plant and station at the same time. Only the virtual bus voltage needs to be monitored. The effective monitoring of the bus voltage of the voltage level in the whole plant can effectively reduce the repeated alarm information sent by multiple buses of the same voltage level in the same plant and station when the limit is exceeded at the same time, and can effectively reduce the number of voltage buses monitored by the dispatcher at the same time; , when monitoring the virtual assessment bus, the outage bus is automatically filtered out, and only the maximum and minimum values of the bus voltage are monitored, which can ensure that the operation monitoring personnel can obtain the operation information of the parallel bus, and also filter out invalid alarm information, reducing the occurrence of invalid alarms. interference, providing effective technical support for operation monitoring personnel to better monitor the bus voltage.

As a further improvement and supplement to the above technical solutions, the present invention also includes the following additional technical features.

When the section busbars of the same voltage level in the same plant and station exceed the limit, they will respectively report the limit alarm.

The outage setting value is the voltage base value * 0.7, and the busbars lower than the outage setting value are considered out of service and will not be included in the judgment of the assessment.

When obtaining the line-to-line voltage value of the bus, judge the validity of the line-to-line voltage value.

Beneficial effects: This technical scheme virtualizes the parallel buses of the same voltage level in the same plant and station as a virtual assessment bus, and does not need to monitor multiple buses of the same voltage level in the same plant and station at the same time. The effective monitoring of the bus voltage of the voltage level in the factory can effectively reduce the repeated alarm information sent by multiple buses of the same voltage level in the same factory station when the limit is exceeded at the same time, and can effectively reduce the number of voltage buses monitored by the dispatcher; in addition, When monitoring the virtual assessment bus, the outage bus is automatically filtered out, and only the maximum and minimum values of the bus voltage are monitored, which can ensure that the operation monitoring personnel can obtain the operation information of the parallel bus, and also filter invalid alarm information, reducing the failure caused by invalid alarms Interference, providing effective technical support for operation monitoring personnel to better monitor the bus voltage.

Detailed ways

The technical solution of the present invention will be further described in detail below.

1. The bus voltage assessment method is characterized in that it comprises the following steps:

1) The parallel busbars of the same plant station and the same voltage level are used as a virtual assessment busbar;

2) Obtain the line voltage value of the bus;

3) When the line voltage of the bus is less than the outage set value, the bus is considered out of service, and the outage bus is filtered out;

4) After filtering out the outage busbars, check the remaining busbars. When the line voltage of the busbars is between the set maximum and minimum values, it is considered normal; Only one alarm needs to be reported; when the section busbars of the same voltage level in the same plant and station exceed the limit, each alarm will be reported.

The outage setting value is the voltage base value * 0.7, and the busbars lower than the outage setting value are considered out of service and will not be included in the judgment of the assessment. In order to improve the accuracy of the information, when obtaining the line voltage value of the bus, the validity of the line voltage value is judged.

The present invention can be realized by software, and its program logic is:

1. Take out the keyid of the associated bus in the assessment bus table, and obtain the corresponding line voltage and quality code from the bus table.

2. Eliminate the busbars that are out of service, according to the voltage base value *0.7 in the voltage type table as the standard, the busbars with a voltage lower than this value are considered out of service, and will not be included in the judgment of the assessment.

3. Compare the results after elimination, and write the maximum voltage value, minimum voltage value and corresponding quality code.

When designing the corresponding program, the development plan includes:

1. Establish table structure: assessment bus table (id (ID), name (assessment bus name), rly_bs1 (associated bus 1), rly_bs2 (associated bus 2), ... rly_bs8 (associated bus 8), low_limit (lower limit ), hight_limit (high limit), vmax (maximum voltage), vmin (minimum voltage), qual (quality code), fac_id (factory station), vlty_id (voltage level).

2. Specify algorithmic logic

a. name (examination bus name), rly_bs1 (associated bus 1), rly_bs2 (associated bus 2),...rly_bs8 (associated bus 8), low_limit (closed lower limit), hight_limit (high limit), fac_id (affiliated factory station), vlty_id (voltage level) is defined by the user.

b. vmax and vmin are automatically calculated by the program. vmax and vmin are respectively equal to the maximum and minimum values of the associated bus voltage (the outage bus needs to be removed), and the corresponding quality code is written.

c. According to the calculated maximum and minimum values of the assessment bus voltage, respectively define them in the limit value table to monitor the maximum and minimum values of the assessment bus.

Example of program usage:

1. Create a new record in the assessment bus table.

2. Use the front-end simulator to send the line voltage of the bus.

3. Check whether the results in the bus bar assessment table have been modified correctly.

4. Eliminate the outage bus test. When the corresponding voltage type of the bus is 220kV and the corresponding outage voltage is 161kV, send telemetry. If the obtained line voltage is less than 161, it is considered as an outage bus.

5. Remove out-of-service busbars.

The above bus voltage assessment method is a specific embodiment of the present invention, which has already reflected the substantive features and progress of the present invention. According to the actual use needs, under the enlightenment of the present invention, it can be equivalently modified in terms of shape, structure, etc. All are within the scope of protection of this program.

Claims (4)

1. The bus voltage assessment method is characterized in that it comprises the following steps: 1) The parallel busbars of the same plant station and the same voltage level are used as a virtual assessment busbar; 2) Obtain the line voltage value of the virtual assessment bus; 3) When the line voltage of the virtual assessment bus is lower than the outage set value, the virtual assessment bus is considered to be out of service, and the outage virtual assessment bus is filtered out; 4) After filtering out the outage virtual assessment bus, check the remaining virtual assessment buses. When the line voltage of the virtual assessment bus is between the set maximum and minimum values, it is considered normal; otherwise, it is considered to exceed the limit. Only one alarm needs to be reported if the bus voltage of the parallel bus exceeds the limit. 2. The busbar voltage assessment method according to claim 1, characterized in that: when the section busbars of the same plant and station with the same voltage level exceed the limit, each of them reports an alarm for exceeding the limit. 3. The bus voltage assessment method according to claim 1, characterized in that: the outage set value is the voltage base value * 0.7, and the virtual assessment bus that is lower than the outage set value is considered outage, and is not included in the judgment of the assessment . 4. The bus voltage assessment method according to claim 1, characterized in that: when obtaining the line voltage value of the virtual assessment bus, the validity of the line voltage value is judged.