Primary frequency modulation adjusting quantity calculation method, system and device and storage medium

Abstract

The invention relates to the technical field of primary frequency modulation, in particular to a primary frequency modulation adjusting quantity calculation method, system and device and a storage medium, a speed regulation system architecture based on a water-turbine generator set comprises a speed regulator and a monitoring system, and the method comprises the following steps that the speed regulator synchronously collects and sends three paths of independent frequency signals to the monitoring system; the monitoring system preprocesses the three independent frequency signals, determines whether a primary frequency modulation calculation condition is met or not based on the preprocessed three independent frequency signals, and determines a primary frequency modulation adjustment amount by calculating power adjustment amounts under different frequency differences and based on an effective frequency difference percentage when the primary frequency modulation calculation condition is met. According to the invention, three paths of independent frequency signals are preprocessed through the monitoring system to eliminate abnormal signals, so that the reliability of the system can be effectively improved; complex computing logic is transferred from the speed regulator to the monitoring system, so that the computing power demand of a local processing unit of the speed regulator can be effectively reduced, and the hardware configuration cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of primary frequency modulation technology, and in particular to a method, system, device and storage medium for calculating a primary frequency modulation adjustment amount. Background Art

[0002] During the operation of the power system, frequency stability is an important prerequisite for ensuring the safe operation of the power system. When there is an active power imbalance in the power system, the system frequency will fluctuate accordingly. Primary frequency regulation is one of the important means for the power system to maintain frequency stability. It quickly adjusts the output of the generator set to offset the frequency deviation, thereby achieving rapid frequency recovery.

[0003] As a crucial component of the power system, the primary frequency regulation performance of the speed regulation system of a hydroelectric generator set directly impacts the stability of the system frequency. Chinese invention patent publication number CN114188992A provides a compatible frequency regulation method for a hydroelectric generator set. Specifically, the method superimposes a processed primary frequency regulation amount onto the set's active power setting value to obtain the set's active power target value. Furthermore, a scaling, hysteresis, and smoothing strategy for the primary frequency regulation target amount is implemented to prevent repeated adjustments by the monitoring system's lower-level computer during the primary frequency regulation process. Furthermore, by enhancing the dynamic stability of the primary frequency regulation process, the sensitivity of the active power closed-loop feedback regulation of the monitoring system's lower-level computer during the primary frequency regulation process is suppressed. This effectively prevents the monitoring system's lower-level computer from interfering with the speed regulator system's primary frequency regulation process, thereby improving the dynamic stability of the primary frequency regulation process. However, the existing technology still has the following defects: (1) The problem of frequency measurement response delay. Due to the limited computing power of the speed regulator, the calculation speed of the superposition amount is limited, which makes it difficult to meet the high-dynamic grid frequency response requirements. The existing technology uses the traditional method of the speed regulator PLC to calculate the frequency regulation amount and then sends it to the monitoring system through an independent AI channel. The monitoring system sends the increase or decrease guide vane opening pulse command to the speed regulator for adjustment. This process responds slowly and has a certain delay, and cannot respond to grid frequency fluctuations in a timely manner; (2) Lack of self-adaptation and intelligent optimization. Once the AI ​​channel of the frequency regulation amount sent by the speed regulator to the monitoring system fails, the monitoring system will not be able to correctly receive the frequency regulation amount, and then the monitoring system will not be able to send the correct control command to the speed regulator, and will not be able to respond correctly to the frequency fluctuation of the grid, causing the fault to further expand; (3) The primary frequency regulation relies on the single frequency signal collected locally by the speed regulator, which is easily interfered by external factors such as noise, resulting in regulation deviation. Summary of the Invention

[0004] The object of the present invention is to provide a method, system, device and storage medium for calculating a primary frequency modulation adjustment amount, so as to solve the technical problems pointed out in the background technology.

[0005] The present invention is implemented through the following technical solutions: A method for calculating a primary frequency regulation amount is based on a speed regulation system architecture of a hydro-generator set, including a speed regulator and a monitoring system, and the method comprises the following steps: The speed regulator synchronously collects and sends three independent frequency signals to the monitoring system; The monitoring system pre-processes the three independent frequency signals and determines whether the primary frequency modulation calculation conditions are met based on the pre-processed three independent frequency signals. When the primary frequency modulation calculation conditions are met, the primary frequency modulation adjustment amount is determined by calculating the power adjustment amount under different frequency differences and based on the effective frequency difference percentage; The calculation conditions for a single frequency modulation are determined by sequentially performing fault judgment and frequency difference judgment on the three pre-processed independent frequency signals. When all three channels are faulty or the three frequency differences are out of limit, it is determined that the calculation conditions for a single frequency modulation are not met; otherwise, the calculation conditions for a single frequency modulation are met.

[0006] According to a preferred embodiment, the range configuration of the three independent frequency signals is 4-20mA corresponding to 45-55Hz.

[0007] According to a preferred embodiment, the speed regulator synchronously uploads three independent frequency signals to the monitoring system with a millisecond sampling period.

[0008] According to a preferred embodiment, the preprocessing includes performing validity check, consistency check and sliding average filtering on the three independent frequency signals.

[0009] According to a preferred embodiment, fault determination specifically includes: The three independent frequency signals after preprocessing are judged to be faulty in turn. When the three independent frequency signals are judged to be normal, the first independent frequency signal is used as the frequency measurement feedback value of the speed regulator, and the three independent frequency signals after preprocessing are subtracted in pairs. The frequency difference judgment is performed based on the frequency difference value obtained by subtracting. When the first independent frequency signal is judged to be abnormal, the second independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the first and second independent frequency signals are judged to be abnormal, the third independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the three independent frequency signals are judged to be abnormal, it is determined that the single frequency regulation calculation condition is not met.

[0010] According to a preferred embodiment, the frequency difference determination specifically includes: The frequency difference values ​​corresponding to the three independent frequency signals are judged in turn. When the frequency difference values ​​corresponding to the three independent frequency signals are all judged to be normal, the first independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the frequency difference value corresponding to the first independent frequency signal is judged to be abnormal, the second independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the frequency difference values ​​corresponding to the first and second independent frequency signals are both judged to be abnormal, the third independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the frequency difference values ​​corresponding to the three independent frequency signals are all judged to be abnormal, it is determined that the one-time frequency regulation calculation condition is not met.

[0011] According to a preferred embodiment, the calculation expression of the primary frequency modulation adjustment amount is:

[0012]

[0013]

[0014]

[0015] In the above formula, Indicates the amount of primary frequency modulation, Indicates the active power rating, Indicates active power regulation. Indicates the effective frequency difference percentage, represents the effective frequency difference, Indicates the rated frequency, Indicates the actual frequency difference value, Indicates the primary frequency modulation dead zone. hour, ,when hour, , Indicates the power closed-loop regulation coefficient, Indicates the conversion factor.

[0016] The present invention also provides a primary frequency modulation adjustment amount calculation system, which is applied to the primary frequency modulation adjustment amount calculation method as described above. The system includes a speed regulator and a monitoring system. The speed regulator is used to synchronously collect and send three independent frequency signals to the monitoring system. The monitoring system is used to preprocess the three independent frequency signals and determine whether the primary frequency modulation calculation conditions are met based on the preprocessed three independent frequency signals. When the primary frequency modulation calculation conditions are met, the primary frequency modulation adjustment amount is determined by calculating the power adjustment amounts under different frequency differences and based on the effective frequency difference percentage. The calculation conditions for a single frequency modulation are determined by sequentially performing fault judgment and frequency difference judgment on the three pre-processed independent frequency signals. When all three channels are faulty or the three frequency differences are out of limit, it is determined that the calculation conditions for a single frequency modulation are not met; otherwise, the calculation conditions for a single frequency modulation are met.

[0017] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for calculating the primary frequency modulation adjustment amount as described above is implemented.

[0018] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method for calculating the primary frequency modulation adjustment amount as described above is implemented.

[0019] The technical solutions of the method, system, device and storage medium for calculating the primary frequency modulation adjustment amount provided by the present invention have at least the following advantages and beneficial effects: (1) The speed regulator synchronously collects and uploads three independent frequency signals to the monitoring system, and the monitoring system pre-processes the three independent frequency signals to eliminate abnormal signals, which can effectively solve the problem of misregulation caused by interference or failure of a single signal source, thereby improving system reliability; (2) The primary frequency modulation adjustment amount is calculated in real time based on multi-dimensional data, which can effectively shorten the primary frequency modulation response time, reduce the adjustment overshoot, and thus suppress the secondary frequency fluctuation; (3) By transferring the complex calculation logic from the speed regulator to the monitoring system, the computing power requirement of the local processing unit of the speed regulator can be effectively reduced, and the hardware configuration cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of a method for calculating a primary frequency modulation adjustment amount provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Example 1 This embodiment provides a method for calculating a primary frequency regulation amount. The method is based on a speed regulation system architecture of a hydro-generator set, including a speed regulator and a monitoring system. Figure 1 This is a flow chart of the method for calculating the primary frequency modulation adjustment amount, see Figure 1 As shown, the method for calculating the primary frequency modulation adjustment amount includes the following steps: The speed regulator synchronously collects and uploads three independent frequency signals to the monitoring system. In some preferred embodiments, the range configuration of the three independent frequency signals is 4-20mA corresponding to 45-55Hz to ensure the accuracy of the signal. Furthermore, the speed regulator synchronously uploads the three independent frequency signals to the monitoring system with a millisecond sampling period to form a redundant data channel.

[0023] The monitoring system preprocesses the three independent frequency signals; in some preferred embodiments, the preprocessing includes using a three-level verification mechanism to process the input three independent frequency signals, specifically performing validity verification, consistency verification and sliding average filtering on the three independent frequency signals, wherein the validity verification is to eliminate abnormal signals that exceed the operating frequency ±5Hz; the consistency verification is to use a three-out-of-two median strategy for the three independent frequency signals, and automatically isolate the fault channel when the deviation of a certain channel from the median is greater than 0.05Hz; the sliding average filtering is to perform a 5-period moving average processing on the valid signal, and the sliding window width is set to 50 milliseconds.

[0024] Specifically, this embodiment uses the speed regulator to synchronously collect and upload three independent frequency signals to the monitoring system. The monitoring system pre-processes the three independent frequency signals to eliminate abnormal signals, which can effectively solve the problem of misadjustment caused by interference or failure of a single signal source, thereby improving system reliability. In addition, by transferring complex calculation logic from the speed regulator to the monitoring system, the computing power requirements of the local processing unit of the speed regulator can be effectively reduced, thereby reducing hardware configuration costs.

[0025] Furthermore, the monitoring system determines whether the condition for one-time frequency modulation calculation is met based on the pre-processed three independent frequency signals. When the condition for one-time frequency modulation calculation is met, the power adjustment amount under different frequency differences is calculated and the one-time frequency modulation adjustment amount is determined based on the effective frequency difference percentage. In some preferred embodiments, the condition for one-time frequency modulation calculation is determined by sequentially performing fault judgment and frequency difference judgment on the pre-processed three independent frequency signals. When all three channels are faulty or all three frequency differences exceed the limit, it is determined that the condition for one-time frequency modulation calculation is not met; otherwise, the condition for one-time frequency modulation calculation is met.

[0026] Specifically in this embodiment, the fault judgment specifically includes: performing fault judgment on the three independent frequency signals after preprocessing in sequence; when the three independent frequency signals are all judged to be normal, using the first independent frequency signal as the frequency measurement feedback value of the speed regulator, and performing a difference between the three independent frequency signals after preprocessing, and performing a frequency difference judgment based on the frequency difference value obtained by the difference; when the first independent frequency signal is judged to be abnormal, using the second independent frequency signal as the frequency measurement feedback value of the speed regulator; when both the first and second independent frequency signals are judged to be abnormal, using the third independent frequency signal as the frequency measurement feedback value of the speed regulator; when all three independent frequency signals are judged to be abnormal, it is determined that the primary frequency regulation calculation condition is not met; The frequency difference judgment specifically includes: performing frequency difference judgment on the frequency difference values ​​corresponding to the three independent frequency signals in turn; when the frequency difference values ​​corresponding to the three independent frequency signals are all judged to be normal, the first independent frequency signal is used as the frequency measurement feedback value of the speed regulator; when the frequency difference value corresponding to the first independent frequency signal is judged to be abnormal, the second independent frequency signal is used as the frequency measurement feedback value of the speed regulator; when the frequency difference values ​​corresponding to the first and second independent frequency signals are both judged to be abnormal, the third independent frequency signal is used as the frequency measurement feedback value of the speed regulator; when the frequency difference values ​​corresponding to the three independent frequency signals are all judged to be abnormal, it is determined that the one-time frequency regulation calculation condition is not met.

[0027] In some preferred embodiments, the calculation expression of the primary frequency modulation adjustment amount is:

[0028]

[0029]

[0030]

[0031] In the above formula, Indicates the amount of primary frequency modulation, Indicates the active power rating, Indicates active power regulation. Indicates the effective frequency difference percentage, represents the effective frequency difference, Indicates the rated frequency, Indicates the actual frequency difference value, Indicates the primary frequency modulation dead zone. hour, ,when hour, , Indicates the power closed-loop regulation coefficient, Indicates the conversion factor.

[0032] The following is an example explanation of the above calculation expression: Assuming frequency , active power rating , rated frequency , primary frequency modulation dead zone , then the effective frequency difference ; Effective frequency difference percentage ; The percentage of active power regulation ,Right now .

[0033] Specifically, this embodiment calculates the primary frequency modulation adjustment amount in real time based on multi-dimensional data, which can effectively shorten the primary frequency modulation response time, reduce the adjustment overshoot, and thus suppress the secondary frequency fluctuation.

[0034] Example 2 This embodiment, based on the technical solution provided in Example 1, provides a primary frequency modulation adjustment amount calculation system. The system is applied to the primary frequency modulation adjustment amount calculation method of Example 1. The system includes a speed regulator and a monitoring system. The speed regulator is used to synchronously collect and upload three independent frequency signals to the monitoring system. The monitoring system is used to preprocess the three independent frequency signals and determine whether the primary frequency modulation calculation conditions are met based on the preprocessed three independent frequency signals. When the primary frequency modulation calculation conditions are met, the primary frequency modulation adjustment amount is determined by calculating the power adjustment amounts under different frequency differences and based on the effective frequency difference percentage. The calculation conditions for a single frequency modulation are determined by sequentially performing fault judgment and frequency difference judgment on the three pre-processed independent frequency signals. When all three channels are faulty or the three frequency differences are out of limit, it is determined that the calculation conditions for a single frequency modulation are not met; otherwise, the calculation conditions for a single frequency modulation are met.

[0035] Example 3 This embodiment is based on the technical solution provided in Example 1 and provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for calculating the primary frequency modulation adjustment amount as in Example 1 is implemented.

[0036] Example 4 This embodiment is based on the technical solution provided in Example 1 and provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the method for calculating the primary frequency modulation adjustment amount as in Example 1 is implemented.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for calculating the primary frequency regulation amount is based on the speed regulation system architecture of a hydro-generator set, including a speed regulator and a monitoring system, and is characterized in that: The method comprises the following steps: The speed regulator synchronously collects and sends three independent frequency signals to the monitoring system; The monitoring system pre-processes the three independent frequency signals and determines whether the primary frequency modulation calculation conditions are met based on the pre-processed three independent frequency signals. When the primary frequency modulation calculation conditions are met, the primary frequency modulation adjustment amount is determined by calculating the power adjustment amount under different frequency differences and based on the effective frequency difference percentage; The calculation conditions for a single frequency modulation are determined by sequentially performing fault judgment and frequency difference judgment on the three pre-processed independent frequency signals. When all three channels are faulty or the three frequency differences are out of limit, it is determined that the calculation conditions for a single frequency modulation are not met; otherwise, the calculation conditions for a single frequency modulation are met.

2. The method for calculating the primary frequency modulation adjustment amount according to claim 1, wherein: The range configuration of the three independent frequency signals is 4-20mA corresponding to 45-55Hz.

3. The method for calculating the primary frequency modulation adjustment amount according to claim 1, wherein: The speed regulator synchronously uploads three independent frequency signals to the monitoring system with a millisecond sampling period.

4. The method for calculating the primary frequency modulation adjustment amount according to claim 1, wherein: Preprocessing includes validity check, consistency check and sliding average filtering of three independent frequency signals.

5. The method for calculating the primary frequency modulation adjustment amount according to claim 1, wherein: Fault diagnosis specifically includes: The three independent frequency signals after preprocessing are judged to be faulty in turn. When the three independent frequency signals are judged to be normal, the first independent frequency signal is used as the frequency measurement feedback value of the speed regulator, and the three independent frequency signals after preprocessing are subtracted in pairs. The frequency difference judgment is performed based on the frequency difference value obtained by subtracting. When the first independent frequency signal is judged to be abnormal, the second independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the first and second independent frequency signals are judged to be abnormal, the third independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the three independent frequency signals are judged to be abnormal, it is determined that the single frequency regulation calculation condition is not met.

6. The method for calculating the primary frequency modulation adjustment amount according to claim 1, wherein: Frequency difference judgment specifically includes: The frequency difference values ​​corresponding to the three independent frequency signals are judged in turn. When the frequency difference values ​​corresponding to the three independent frequency signals are all judged to be normal, the first independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the frequency difference value corresponding to the first independent frequency signal is judged to be abnormal, the second independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the frequency difference values ​​corresponding to the first and second independent frequency signals are both judged to be abnormal, the third independent frequency signal is used as the frequency measurement feedback value of the speed regulator. When the frequency difference values ​​corresponding to the three independent frequency signals are all judged to be abnormal, it is determined that the one-time frequency regulation calculation condition is not met.

7. The method for calculating the primary frequency modulation adjustment amount according to claim 1, wherein: The calculation expression of the primary frequency modulation adjustment amount is: In the above formula, Indicates the amount of primary frequency modulation, Indicates the active power rating, Indicates active power regulation. Indicates the effective frequency difference percentage, represents the effective frequency difference, Indicates the rated frequency, Indicates the actual frequency difference value, Indicates the primary frequency modulation dead zone. hour, ,when hour, , Indicates the power closed-loop regulation coefficient, Indicates the conversion factor.

8. A primary frequency modulation adjustment amount calculation system, applied to the primary frequency modulation adjustment amount calculation method according to any one of claims 1 to 7, characterized in that: The system includes a speed regulator and a monitoring system. The speed regulator is used to synchronously collect and upload three independent frequency signals to the monitoring system. The monitoring system is used to preprocess the three independent frequency signals and determine whether the primary frequency modulation calculation conditions are met based on the preprocessed three independent frequency signals. When the primary frequency modulation calculation conditions are met, the power adjustment amount under different frequency differences is calculated and the primary frequency modulation adjustment amount is determined based on the effective frequency difference percentage. The calculation conditions for a single frequency modulation are determined by sequentially performing fault judgment and frequency difference judgment on the three pre-processed independent frequency signals. When all three channels are faulty or the three frequency differences are out of limit, it is determined that the calculation conditions for a single frequency modulation are not met; otherwise, the calculation conditions for a single frequency modulation are met.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for calculating the primary frequency modulation adjustment amount according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that A computer program is stored on a computer-readable storage medium, and when the computer program is executed by a processor, the method for calculating a primary frequency modulation adjustment amount according to any one of claims 1 to 7 is implemented.

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