A power station grid-connected operation optimization compensation method and system

Abstract

The present application relates to a kind of power station grid-connected operation optimization compensation method and system, belong to power station grid-connected operation control technical field, solve the existing technology in the presence of power station grid-connected examination index deviation passive, accounting lag, dispatching precision insufficient problem.Method includes: the static parameters and operating data of power station are collected, obtains grid-connected dispatching instruction;Wherein, operating data includes the active power and frequency deviation of each unit;According to operating data, grid examination index and / or grid-connected dispatching instruction, judge whether to start compensation adjustment;Wherein, compensation adjustment includes frequency modulation compensation adjustment, first dispatching compensation adjustment;If start compensation adjustment, then according to static parameters, operating data, grid examination index and / or grid-connected dispatching instruction, calculate compensation power;Based on compensation power, determine corresponding adjustment signal, according to adjustment signal adjustment operating data.The present application realizes real-time monitoring, accurate calculation and active deviation of examination index.

Description

Technical Field

[0001] This invention relates to the field of power plant grid-connected operation control technology, and in particular to a power plant grid-connected operation optimization compensation method and system. Background Technology

[0002] With the rapid expansion of new energy power generation capacity and the gradual improvement of the electricity market spot trading mechanism, the power grid has placed higher demands on the ancillary service capabilities and grid-connected operation stability of power plants. To regulate the operation of grid-connected power plants and ensure the safe, high-quality, and economical operation of the power system, regional power grid management departments in my country have formulated two detailed rules: the "Implementation Rules for Power Grid-Connected Operation Management" and the "Implementation Rules for Power Ancillary Service Management." These rules clearly stipulate the assessment standards and algorithms for power plants (especially hydropower plants) in areas such as primary frequency regulation and daily load planning curves.

[0003] In existing technologies, power plants often use a post-event accounting model to calculate performance indicators. This means that after the assessment period ends, the assessed electricity volume and amount are calculated based on historical operating data. This makes it difficult to detect problems and correct deviations in real time during unit regulation, leaving the plant to passively accept the assessment results. Furthermore, existing technologies lack targeted real-time optimization and compensation mechanisms for power plant units. Even if regulation deviations are detected, accurate correction cannot be completed before the assessment deadline, making it difficult to effectively meet assessment requirements. In addition, existing optimization schemes focus on optimizing single performance indicators, lacking coordinated optimization of multiple indicators such as primary frequency regulation and daily load planning curves. They also typically require modifications to the original monitoring or speed control system programs, altering the operation of the unit's original main automatic control systems and posing safety hazards.

[0004] Therefore, there is an urgent need for a power plant grid-connected operation optimization compensation method and system to achieve the integration, real-time monitoring, accurate calculation, and proactive correction of assessment indicator algorithms, so as to solve the problems of weak predictive ability of assessment results, passive correction, and insufficient adjustment accuracy in existing technologies. Summary of the Invention

[0005] Based on the above analysis, the embodiments of the present invention aim to provide a method and system for optimizing and compensating for power plant grid-connected operation, in order to solve the problems of passive correction, delayed calculation, and insufficient scheduling accuracy in the existing technology for power plant grid-connected assessment indicators.

[0006] On one hand, embodiments of the present invention provide a method for optimizing compensation during grid-connected operation of a power plant, comprising: Collect static parameters and operating data of the power plant to obtain grid connection dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit; Based on the operational data, power grid performance indicators, and / or the grid connection dispatch instructions, determine whether to initiate compensation adjustment; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment; If the compensation adjustment is initiated, the compensation power is calculated based on the static parameters, the operating data, the power grid assessment indicators, and / or the grid connection dispatching instructions. Based on the compensation power, a corresponding adjustment signal is determined, and the operating data is adjusted according to the adjustment signal.

[0007] Further, based on the operational data, power grid performance indicators, and / or the grid connection dispatch instructions, it is determined whether to initiate compensation regulation, including: Based on the frequency deviation and the power grid assessment indicators, determine whether a frequency anomaly has occurred. If the frequency anomaly has occurred, calculate the frequency regulation contribution rate. Based on the frequency regulation contribution rate and the power grid assessment indicators, determine whether to initiate the frequency regulation compensation adjustment. Alternatively, based on the active power and the grid connection dispatching instruction, the dispatching deviation can be calculated, and based on the dispatching deviation and the power grid assessment indicators, it can be determined whether to initiate the first dispatching compensation adjustment.

[0008] Furthermore, the operational data also includes status data; after determining whether to initiate the first scheduling compensation adjustment, it further includes: If the determination result is to initiate the first scheduling compensation adjustment, then based on the status data, determine whether the power station is in the frequency regulation compensation state; if it is in the frequency regulation compensation state, then update the determination result to not initiate the first scheduling compensation adjustment.

[0009] Further, the frequency modulation contribution rate is calculated through the following steps: For each moment after the frequency anomaly occurs, a first active power deviation is calculated based on the corresponding frequency deviation and the static parameters; wherein, the static parameters include the grid rated frequency, frequency regulation droop coefficient, and rated capacity; Based on the time of the frequency anomaly and each of the first active power deviations, calculate the theoretical power contribution of the first frequency modulation at each time. Based on the time when the frequency anomaly occurred and the active power at each time, calculate the actual power contribution of the first frequency modulation at each time. The frequency modulation contribution rate is calculated based on the theoretical and actual power contributions of the first frequency modulation.

[0010] Furthermore, the compensation power includes frequency modulation compensation power and first scheduling compensation power; If the compensation adjustment is initiated, the compensation power is calculated based on the operating data, power grid performance indicators, and / or the grid connection dispatch instruction, including: If the frequency regulation compensation adjustment is initiated, the frequency regulation compensation power is calculated based on the active power, the frequency deviation, and the power grid assessment indicators, and the corresponding frequency regulation compensation execution time is determined. If the first scheduling compensation adjustment is initiated, the first scheduling compensation power is calculated based on the active power, the power grid assessment indicators, and the grid connection scheduling instruction.

[0011] Furthermore, if the frequency regulation compensation adjustment is initiated, the frequency regulation compensation power is calculated based on the active power, the frequency deviation, and the power grid performance indicators, and the corresponding frequency regulation compensation execution time is determined, including: Starting from the moment the frequency anomaly occurs, if the active power changes within the first frequency modulation cycle, the moment when the active power changes shall be taken as the frequency modulation maneuver moment. Starting from the frequency modulation maneuver time, the end time of the second frequency modulation cycle is taken as the frequency modulation compensation execution time; The frequency adjustment compensation power is calculated based on the time when the frequency anomaly occurs, the time of the frequency adjustment maneuver, the time of the frequency adjustment compensation execution, the frequency adjustment assessment cycle, the operating data, and the static parameters.

[0012] Further, based on the time of the frequency anomaly occurrence, the time of the frequency modulation maneuver, the time of the frequency modulation compensation execution, the frequency modulation assessment cycle, the operating data, and the static parameters, the frequency modulation compensation power is calculated, including: Calculate the frequency modulation maneuver power based on the time of the frequency anomaly, the time of the frequency modulation maneuver, and the corresponding active power; The missing power for frequency regulation is calculated based on the time when the frequency anomaly occurred, the time when the frequency regulation compensation was executed, the frequency deviation, the static parameters, the frequency regulation maneuvering power, and the frequency regulation assessment cycle. The remaining time for the frequency adjustment assessment is determined based on the time when the frequency anomaly occurred, the time when the frequency adjustment compensation was executed, and the frequency adjustment assessment cycle. The frequency modulation compensation power is calculated based on the missing frequency modulation power, the remaining time of the frequency modulation assessment, and the frequency modulation maneuver power.

[0013] Further, based on the time of the frequency anomaly occurrence, the time of the frequency modulation compensation execution, the frequency deviation, the static parameters, the frequency modulation maneuvering power, and the frequency modulation assessment cycle, the missing frequency modulation power is calculated, including: The theoretical power contribution of the second frequency modulation is calculated based on the time when the frequency anomaly occurs, the time when the frequency modulation compensation is executed, the frequency deviation, and the static parameters. The actual power contribution of the second frequency modulation is calculated based on the time when the frequency anomaly occurs, the time when the frequency modulation compensation is executed, and the frequency modulation maneuver power. The time elapsed for the frequency modulation assessment is determined based on the time when the frequency anomaly occurred, the time when the frequency modulation compensation was executed, and the frequency modulation assessment cycle. The missing power of frequency regulation is calculated based on the theoretical power contribution of the second frequency regulation, the actual power contribution of the second frequency regulation, the frequency regulation assessment cycle, and the time already used for the frequency regulation assessment.

[0014] Furthermore, the operating data also includes the governor guide vane opening; Based on the compensation power, a corresponding adjustment signal is determined, and the operating data is adjusted according to the adjustment signal, including: Based on the frequency modulation compensation power, the adjustment signal corresponding to the frequency modulation unit is determined, and the speed governor guide vane opening corresponding to the frequency modulation unit is adjusted according to the adjustment signal at the frequency modulation compensation execution time; wherein, the frequency modulation unit is the unit that triggers the frequency modulation compensation adjustment; Alternatively, based on the first scheduling compensation power, the adjustment signal corresponding to the first target unit is determined, and the opening of the governor guide vane corresponding to the first target unit is adjusted according to the adjustment signal; wherein, the first target unit is determined based on the scheduling priority of each unit.

[0015] On the other hand, embodiments of the present invention provide a power plant grid-connected operation optimization compensation system, comprising: The communication acquisition module is used to collect the static parameters and operating data of the power plant and obtain grid connection dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit; The optimized compensation calculation module is used to determine whether to initiate compensation adjustment based on the operating data, power grid assessment indicators, and / or the grid connection dispatch instructions; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment; The optimized compensation calculation module is also used to calculate the compensation power based on the static parameters, the operating data, the power grid assessment indicators and / or the grid connection dispatching instructions if the compensation adjustment is initiated. The optimization compensation calculation module is also used to determine the corresponding adjustment signal based on the compensation power; The local terminal is adjusted to regulate the operating data according to the adjustment signal.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: By collecting static parameters and operational data of the power plant and obtaining grid-connected dispatch instructions, the system analyzes the power plant's operational status in real time. Based on operational data, grid performance indicators, and / or grid-connected dispatch instructions, it analyzes whether the power plant needs to initiate frequency regulation compensation adjustment or primary dispatch compensation adjustment. This enables timely response to primary frequency regulation and the power plant's daily load plan curve, real-time monitoring of deviations from performance indicators, and timely detection of potential performance failures, thereby improving the power plant's ability to anticipate performance indicators. Furthermore, for situations requiring compensation adjustment, the system calculates compensation power based on static parameters, operational data, grid performance indicators, and / or grid-connected dispatch instructions. It accurately calculates the deviation between the power plant's current operational status and performance indicators, thereby generating corresponding adjustment signals to adjust the power plant's operational data. Ultimately, this achieves proactive and precise correction, enhancing the power plant's real-time optimization and compensation capabilities, increasing the pass rate within the assessment period, reducing economic losses from assessments, and improving the compliance of the power plant's grid-connected operation.

[0017] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0018] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Figure 1 This is a flowchart illustrating a power plant grid-connected operation optimization compensation method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the main modules of a power plant grid-connected operation optimization compensation system according to an embodiment of the present invention. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0020] A specific embodiment of the present invention discloses a method for optimizing compensation during grid-connected operation of a power plant, such as... Figure 1 As shown, it includes: Step S1: Collect the static parameters and operating data of the power station and obtain grid connection dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit.

[0021] In this embodiment, static parameters and operational data of the power plant are collected in real time to obtain grid connection dispatch instructions. For example, static parameters and operational data are acquired in real time from the power plant's unit monitoring system, synchronization vector system (PMU), governor system, and excitation system via a communication interface. The acquisition frequency is once per second to ensure the real-time performance and accuracy of the data. Grid connection dispatch instructions issued by the power grid dispatching department are also acquired via the communication interface, with the acquisition frequency consistent with the frequency of the instructions issued by the power grid dispatching department. The power plant includes multiple generating units for power generation, and the operational data includes the active power and frequency deviation of each unit. Further, static parameters include the grid rated frequency, frequency regulation droop coefficient, and rated capacity of each unit; grid connection dispatch instructions include the daily load plan curve; and operational data also includes the governor guide vane opening and grid frequency. Even further, the operational data also includes status data, such as frequency regulation compensation status.

[0022] In this embodiment, the daily load plan curve is determined based on the daily charging and generating plan of the power station issued by the power grid dispatching department. It is the basis for the power station to adjust the output of the generating units so that the actual charging and generating of all the generating units after the adjustment of the power station is consistent with the plan.

[0023] Furthermore, step S1 also includes data verification of the collected static parameters and operating data. The static parameters and operating data that pass the data verification are used to determine whether to initiate compensation adjustment. For example, abnormal data is removed and supplemented to improve the accuracy of subsequent calculations. For instance, if the frequency deviation exceeds the limit at a certain moment, the average active power of the previous 3 seconds is used as the active power at that moment; if the grid frequency data exceeds the reasonable range of 49.5Hz~50.5Hz, it is judged as abnormal data, removed, and supplemented by interpolation of data from adjacent moments.

[0024] Step S2: Based on the operating data, power grid assessment indicators and / or the grid connection dispatch instructions, determine whether to initiate compensation adjustment; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment.

[0025] Based on the operating data of each unit within the power plant, the power grid assessment indicators, and / or grid connection dispatch instructions, it is determined whether to initiate compensation adjustment. In this embodiment, the power grid assessment indicators are determined based on the detailed rules formulated by the power grid management department. Through real-time collection of static parameters, operating data, and grid connection dispatch instructions, during the operation and adjustment of the power plant units, the assessment indicator algorithm in the relevant detailed rules is used to predict whether the power plant can meet the corresponding power grid assessment indicator requirements if it continues to operate according to the current operating data. This achieves the integration of power grid assessment indicators and real-time optimization compensation for power plant operation. Before the power grid management department implements the assessment, the assessment results are predicted. If it is predicted in step S2 that the assessment requirements of the power grid assessment indicators cannot be met, then in step S3, before the end of the assessment period, a precise adjustment compensation amount (i.e., compensation power) is calculated to correct the operating data of the power plant units, ensuring that the power plant's assessment indicators are met and reducing the economic losses of the power plant due to the assessment.

[0026] Taking a certain province as an example, the "Implementation Rules for Power Grid Connection Operation Management" and "Implementation Rules for Power Auxiliary Service Management" issued by its power grid management department are the core basis for the power grid management department to regulate the grid connection operation behavior of hydropower stations and assess auxiliary service capabilities. These rules set forth specific and strict assessment requirements for the grid connection operation performance of hydropower stations within its jurisdiction. Core assessment indicators include primary frequency regulation performance and daily load plan curve tracking accuracy. Currently, the existing control systems of these power stations are significantly inadequate in terms of regulation accuracy, response speed, and proactive correction in meeting the assessment requirements outlined in these rules. This results in the power stations frequently facing assessments, leading to significant economic losses. Primary frequency regulation refers to the automatic control process by which the unit control system automatically adjusts active power to limit frequency changes and maintain grid frequency stability when the grid frequency deviates from its rated value. The corresponding automatic adjustment result is the primary frequency regulation performance. Daily load plan curve tracking accuracy refers to the degree of consistency between the actual output and the planned output after the power station adjusts its unit output according to the daily load plan curve.

[0027] In this embodiment, the power grid performance indicators include primary frequency regulation performance indicators and daily load planning curve performance indicators. In other embodiments, the categories of power grid performance indicators can be adjusted, added, or refined based on the relevant performance rules formulated by the power grid management department. For example, primary frequency regulation performance indicators may include small disturbance performance indicators, large disturbance performance indicators, performance indicators for functions not yet available, performance indicators for functions not yet operational, simulated disturbance performance indicators, performance indicators for correct operation, and performance indicators for false signals, covering the entire scenario of primary frequency regulation operation of the units.

[0028] In this embodiment, the compensation adjustment includes frequency modulation compensation adjustment and first scheduling compensation adjustment, and step S2 includes step S21 or step S22.

[0029] Step S21: Based on the frequency deviation and the power grid assessment indicators, determine whether a frequency anomaly has occurred. If the frequency anomaly has occurred, calculate the frequency regulation contribution rate. Based on the frequency regulation contribution rate and the power grid assessment indicators, determine whether to initiate the frequency regulation compensation adjustment.

[0030] Specifically, based on the frequency deviation of each unit collected in real time, it is determined whether the spectrum deviation of each unit at each time is within the spectrum deviation range of the power grid assessment indicators. If it is within the spectrum deviation range of the power grid assessment indicators, it is determined that the unit has a frequency anomaly at that time, that is, the power grid frequency deviates from the rated value. Starting from that time, the frequency regulation contribution rate of the unit is calculated, that is, the self-adjustment result of the existing control system of the monitoring unit in response to the frequency anomaly (i.e., primary frequency regulation). Based on the frequency regulation contribution rate and the primary frequency regulation assessment indicators in the power grid assessment indicators, it is determined whether to start frequency regulation compensation adjustment.

[0031] Furthermore, if the frequency modulation contribution rate is within the allowable range of the corresponding primary frequency modulation assessment indicator, it is determined that frequency modulation compensation adjustment will not be initiated; if the frequency modulation contribution rate is not within the allowable range of the corresponding primary frequency modulation assessment indicator, it is determined that frequency modulation compensation adjustment will be initiated, so as to adjust the units experiencing frequency anomalies in a timely manner according to steps S3-S4, thereby improving the probability of primary frequency modulation assessment. In this embodiment, according to the division of the spectrum deviation range, the allowable range of the primary frequency modulation assessment indicator includes a small disturbance contribution rate threshold and a large disturbance contribution rate threshold. For example, the spectrum deviation range is divided into a small disturbance range. Large disturbance range The corresponding thresholds for small disturbance contribution rate are 0.35 and large disturbance contribution rate are 0.8. For example, if the frequency deviation at a certain moment is 0Hz, which is not within the spectrum deviation range in the power grid assessment indicators, it is judged that no frequency anomaly has occurred. Furthermore, it can be determined that the power plant is operating normally at that moment based on the fact that the frequency deviation at that moment is the lower limit of the small disturbance range. If the frequency deviation at a certain moment is 0.05Hz, which is within the small disturbance range in the power grid assessment indicators, it is judged that a frequency anomaly has occurred, and the corresponding primary frequency regulation assessment indicator is the small disturbance contribution rate threshold (0.35). Starting from that moment, the frequency regulation contribution rate is calculated for each subsequent moment. If the frequency regulation contribution rate is greater than the small disturbance contribution rate threshold (0.35), it is determined that frequency regulation compensation adjustment will not be initiated. If the frequency regulation contribution rate does not reach the small disturbance contribution rate threshold (0.35), it is determined that frequency regulation compensation adjustment will be initiated. If the frequency deviation at a certain moment is 0.6Hz, which is not within the spectrum deviation range of the power grid assessment indicators, it is determined that no frequency anomaly has occurred. Furthermore, if the frequency deviation at that moment is greater than the upper limit of the large disturbance range, it can be further determined that the power plant operating condition is abnormal at that moment, and a warning can be issued. In other embodiments, the small disturbance contribution rate threshold is 0.35-1.5. If the frequency regulation contribution rate is less than 0.35 or greater than 1.5, it is determined that frequency regulation compensation adjustment will be initiated.

[0032] In other embodiments, the frequency regulation contribution rate threshold can be set based on the power plant type and the relevant assessment rules formulated by the power grid management department. The primary frequency regulation assessment indicators also include the monthly disturbance non-compliance number threshold and the single-time fluctuation range of disturbance power. For example, based on the number of disturbance non-compliances that have occurred in the current month and the monthly non-compliance number threshold, the daily average daily disturbance non-compliance number threshold for the remaining days of the current month is determined. If a frequency anomaly occurs at a certain time on a certain day, and the frequency regulation contribution rate does not reach the corresponding primary frequency regulation assessment indicator, and the number of disturbance non-compliances on that day has reached the daily disturbance non-compliance number threshold, and the deviation between the active power of the unit and the planned power at the corresponding time of the daily load plan curve is greater than the single-time fluctuation range of disturbance power, then it is determined that frequency regulation compensation adjustment is initiated.

[0033] In this embodiment, the frequency modulation contribution rate is calculated through steps S211-S214: Step S211: For each moment after the frequency anomaly occurs, calculate the first active power deviation based on the corresponding frequency deviation and the static parameter.

[0034] For each moment following the occurrence of a frequency anomaly, the corresponding first active power deviation is calculated moment by moment based on the frequency deviation and static parameters at each moment. In this embodiment, for the unit experiencing a frequency anomaly, the first active power deviation at each moment following the occurrence of the frequency anomaly is calculated according to the formula... Calculate, where, The frequency deviation at each moment The rated frequency of the power grid. This is the frequency modulation droop coefficient. This is the rated capacity.

[0035] The frequency deviation at each moment represents the difference between the grid frequency and the grid's rated frequency at that moment. When the grid frequency is higher than the grid's rated frequency, the frequency deviation is positive; when the grid frequency is lower than the grid's rated frequency, the frequency deviation is negative. Furthermore, the static parameters also include the grid frequency dead zone, where the frequency deviation at each moment represents the difference between the grid frequency at that moment and the grid's rated frequency and the grid frequency dead zone.

[0036] Step S212: Calculate the theoretical contribution of the first frequency modulation at each time point based on the time when the frequency anomaly occurs and each of the first active power deviations.

[0037] Based on the time of the frequency anomaly and the first active power deviation at each subsequent time, calculate the first theoretical frequency regulation contribution at each time point. For example, In the formula, The theoretical contribution of the first frequency modulation at the k-th time after the occurrence of the frequency anomaly. The time when the frequency anomaly occurred. This is the k-th moment after the moment the frequency anomaly occurred.

[0038] Step S213: Calculate the actual power contribution of the first frequency regulation at each time according to the time when the frequency anomaly occurred and the active power at each time.

[0039] Based on the time of the frequency anomaly, the active power at each subsequent time, calculate the actual power contribution of the first frequency regulation at each time point. For example, In the formula, The actual power contribution of the first frequency modulation at the k-th time after the frequency anomaly occurs. The time when the frequency anomaly occurred. The k-th time after the time an anomaly occurred. for The active power corresponding to each moment. for The active power at any given moment.

[0040] Step S214: Calculate the frequency modulation contribution rate based on the theoretical contribution power of the first frequency modulation and the actual contribution power of the first frequency modulation.

[0041] Calculate the frequency modulation contribution rate based on the theoretical and actual power contribution of the first frequency modulation. For example, In the formula, The frequency modulation contribution rate is the k-th time interval after the occurrence of the frequency anomaly.

[0042] Step S22: Calculate the dispatch deviation based on the active power and the grid connection dispatch instruction, and determine whether to initiate the first dispatch compensation adjustment based on the dispatch deviation and the power grid assessment indicators.

[0043] In this embodiment, the grid-connected dispatch instruction includes a daily load planning curve, which represents the daily active power output plan (i.e., planned power) of the power station determined based on the daily charging and generating plans issued by the grid dispatching department. The power station adjusts the unit output based on this curve. The time step corresponding to the planned power is the dispatch assessment cycle, that is, the planned power is set according to the dispatch assessment cycle. The grid assessment index includes the daily load planning curve assessment index, which represents the allowable deviation range between the sum of the active power of all units of the power station and the planned power in each dispatch assessment cycle. The dispatch assessment cycle is divided according to natural time. For example, if the dispatch assessment cycle is 1 minute, then 12:00:00 is the start time of a daily load planning curve assessment (the start time of the dispatch assessment cycle), and 12:00:00-12:00:59 is the dispatch assessment cycle of a daily load planning curve assessment.

[0044] First, the dispatch deviation is calculated based on the active power and grid connection dispatch instructions. Based on the real-time collected active power and daily load power curves for each unit at each time point, corresponding to the planned power of the dispatch assessment period, the dispatch deviation is calculated from the start of the dispatch assessment period to each subsequent time point. In the formula, This represents the sum of the active power of all generating units at the k-th moment after the start of the scheduling assessment cycle. Let be the planned power at time k. In this embodiment, based on the planned power during the scheduling assessment period and the scheduling assessment period, the planned power corresponding to each time point is determined according to the linear principle. In the formula, This represents the planned power for the scheduling assessment period corresponding to the k-th time point. This indicates the frequency tuning assessment cycle.

[0045] Secondly, based on the dispatch deviation and power grid performance indicators, it is determined whether to initiate the first dispatch compensation adjustment. In this embodiment, the determination of whether to initiate the first dispatch compensation adjustment is based on the dispatch deviation at each time point and the corresponding daily load plan curve performance indicators. The daily load plan curve performance indicators at each time point are determined according to a linear principle. For example, In the formula, The performance indicators for the daily load plan curve at time k. The cumulative duration from the start of the scheduling assessment cycle to the k-th time point. It serves as a performance indicator for the daily load planning curve.

[0046] Furthermore, if the scheduling deviation at any given time does not exceed the assessment index of the daily load plan curve corresponding to that time, it is determined that the first scheduling compensation adjustment will not be initiated; if the scheduling deviation at a certain time exceeds the assessment index of the daily load plan curve corresponding to that time, it is determined that the first scheduling compensation adjustment will be initiated.

[0047] Furthermore, if the existing system of the power plant includes AGC regulation, the corresponding status data includes the AGC regulation status. The power plant will automatically adjust according to the planned power at the beginning of the dispatch assessment cycle. In order to avoid the conflict between automatic adjustment and the first dispatch compensation adjustment, before step S22, it is determined whether the power plant is performing AGC regulation based on the AGC regulation status. If so, step S22 is not executed; otherwise, step S22 is executed. For example, if the AGC regulation execution time of the power plant is 30 seconds, then step S22 will be executed starting at the 31st second after the start of the dispatch assessment cycle.

[0048] In other embodiments, a scheduling maneuver cycle can be set according to the scheduling assessment cycle. During the scheduling maneuver cycle, no judgment is made on whether to initiate the first scheduling compensation adjustment, reserving time for the power station to automatically adjust according to the planned power. After the scheduling maneuver cycle ends, a judgment is made on whether to initiate the first scheduling compensation adjustment, and based on the judgment result, it is determined whether to perform compensation adjustment and the specific compensation power, ensuring that the actual active power of the power station reaches the planned power at the end of the scheduling assessment cycle. For example, if the scheduling assessment cycle is 60s and the scheduling maneuver cycle is 45s, no judgment is made on whether to initiate the first scheduling compensation adjustment from the 1st to the 45th second of each minute. The judgment on whether to initiate the first scheduling compensation adjustment is executed from the 46th second, ensuring that the actual active power of the power station reaches the planned power at the 60th second.

[0049] In other embodiments, a scheduling prediction period and a scheduling deviation exceeding a threshold can be set according to the scheduling assessment period. Within the scheduling prediction period, if the number of times the scheduling deviation exceeds the daily load plan curve assessment indicator at the corresponding time reaches the scheduling deviation exceeding threshold, it is determined that the first scheduling compensation adjustment will be initiated. For example, if the scheduling assessment period is 60s, the scheduling prediction period is set to 30s, and the daily load plan curve assessment indicator is a scheduling deviation of less than 1MW, if the number of times the scheduling deviation exceeds the daily load plan curve assessment indicator at that time within 30s after the start of the scheduling assessment period is less than the scheduling deviation exceeding threshold, it can be predicted that within the scheduling assessment period, the deviation between the active power and the planned power of all units of the power station is within the range of the daily load plan curve assessment indicator, and it is determined that the first scheduling compensation adjustment will not be initiated.

[0050] In this embodiment, the running data also includes status data, and after step S22, the following is also included: Step S23: If the judgment result is to start the first scheduling compensation adjustment, then determine whether the power station is in the frequency regulation compensation state according to the status data; if it is in the frequency regulation compensation state, then update the judgment result to not start the first scheduling compensation adjustment.

[0051] If the judgment result corresponding to step S22 is to initiate the first scheduling compensation adjustment, then based on the status data, it is determined whether the power station is in frequency regulation compensation state. If it is in frequency regulation compensation state, the judgment result is updated to not initiate the first scheduling compensation adjustment. Based on the frequency regulation compensation status information in the status data, it is determined whether the power station is currently in frequency regulation compensation state. If it is in frequency regulation compensation state, frequency regulation compensation continues to be executed, and the first scheduling compensation adjustment is not executed, that is, the judgment result is updated to not initiate the first scheduling compensation adjustment.

[0052] In other embodiments, steps S21 and S22 can be executed simultaneously. If the corresponding judgment results are "start frequency modulation compensation adjustment" and "start first scheduling compensation adjustment" respectively, the judgment result of starting frequency modulation compensation adjustment is retained, and step S31 is executed to update the judgment result of starting first scheduling compensation adjustment to "do not start first scheduling compensation adjustment".

[0053] Furthermore, to improve the accuracy of response to grid connection dispatch instructions, the grid connection dispatch instructions also include a daily power generation plan curve, which represents the planned power generation of the power station for several power dispatch cycles determined based on the daily charging and power generation plans issued by the grid dispatching department, for example, a power dispatch cycle of 15 minutes; the compensation adjustment also includes a second dispatch compensation adjustment, and step S2 also includes: Step S24: Calculate the power deviation based on the active power and grid connection dispatch instructions. Within the power dispatch cycle, determine whether to initiate the second dispatch compensation adjustment based on the power deviation and grid assessment indicators.

[0054] First, the power deviation is calculated based on the active power and grid connection dispatch instructions. Based on the real-time active power of each unit at each moment and the planned power of the daily power generation plan curve for the power dispatch cycle, the corresponding power deviation is calculated from the start of the power dispatch cycle to each subsequent moment. In the formula, This represents the power deviation at the k-th time after the start of the power dispatch cycle. for The planned power consumption for the corresponding power dispatch cycle at any given time. This refers to the k-th time after the start of the power dispatch cycle. This marks the start of the power dispatch cycle. for Time to The amount of electricity generated by all generating units at any given time. for The sum of the active power of all generating units at any given time. for The sum of the active power of all generating units at any given time.

[0055] Secondly, within the power dispatch cycle, based on the power deviation and grid performance indicators, it is determined whether to initiate the second dispatch compensation adjustment. In this embodiment, based on the planned power volume of the power dispatch cycle, the power deviation threshold corresponding to each moment is determined according to a linear principle. In the formula, This is the power deviation threshold corresponding to the (k+1)th time after the start of the power scheduling cycle. For power dispatching cycle, This represents the cumulative duration from the start of the power dispatch cycle to the kth time point. In other embodiments, the power deviation threshold corresponding to each time point can also be determined according to the planned power volume of the power dispatch cycle and following a non-linear principle, so as to pre-complete more planned power volume in the early stage of the power dispatch cycle.

[0056] Furthermore, if the power deviation at a certain moment is less than the corresponding power deviation threshold, the judgment result is that the second scheduling compensation adjustment will not be initiated; if the power deviation at a certain moment is not less than the corresponding power deviation threshold, the judgment result is that the second scheduling compensation adjustment will be initiated.

[0057] It is understandable that step S24 can be executed in conjunction with step S22. In this case, step S22 calculates the dispatch deviation based on the active power and the grid connection dispatch instruction. Specifically, for each power dispatch cycle, based on the generated power in the power dispatch cycle and the planned power included in the corresponding grid connection dispatch instruction, the average power of the remaining time in the power dispatch cycle is determined, and then the new planned power at each time is determined. Then, based on the active power at each time and the corresponding new planned power, the dispatch deviation is calculated. Based on the dispatch deviation and the new planned power corresponding to the grid assessment indicators, it is determined whether to start the first dispatch compensation adjustment.

[0058] Furthermore, the status data also includes the AGC operation mode. Before step S2, based on the AGC operation mode and the power grid assessment indicators, it is determined whether the power station is in an exemption from assessment at the current moment. If it is in an exemption from assessment, then step S2 is determined to not start compensation regulation.

[0059] In other embodiments, the status data also includes the equipment power-on time. If the equipment power-on time is shorter than the preset power-on duration, step S2 is not executed, or the judgment result of step S2 is forced to not start compensation adjustment, so that compensation adjustment can be performed after the unit equipment has been powered off, restarted, and stabilized. It can be understood that the equipment power-on time refers to the time during which the unit equipment itself is powered on and running.

[0060] Step S3: If the compensation adjustment is initiated, the compensation power is calculated based on the static parameters, the operating data, the power grid assessment indicators, and / or the grid connection dispatching instructions.

[0061] In this embodiment, the compensation power includes frequency modulation compensation power and first scheduling compensation power, and step S3 includes step S31 or step S32.

[0062] Step S31: If the frequency regulation compensation adjustment is initiated, the frequency regulation compensation power is calculated based on the active power, the frequency deviation, and the power grid assessment indicators, and the corresponding frequency regulation compensation execution time is determined.

[0063] If frequency regulation compensation is initiated, the frequency regulation compensation power is calculated based on the active power, frequency deviation, and power grid assessment indicators, and the corresponding frequency regulation compensation execution time is determined, specifically including steps S311-S313.

[0064] Step S311: Starting from the moment the frequency anomaly occurs, if the active power changes within the first frequency modulation cycle, the moment when the active power changes is taken as the frequency modulation maneuver moment.

[0065] Starting from the moment the frequency anomaly occurs, if the active power changes within the first frequency regulation cycle, the moment of change in active power is taken as the frequency regulation maneuver moment. In this embodiment, the duration of the first frequency regulation cycle is shorter than the frequency regulation assessment cycle. For example, the first frequency regulation cycle is 10 seconds. That is, within 10 seconds after the moment the frequency anomaly occurs, it is detected whether the active power of the unit experiencing the frequency anomaly has changed. If it has changed, the unit has automatically adjusted to cope with the frequency anomaly and has affected the active power. The moment of change in active power is taken as the frequency regulation maneuver moment. Step S312: Starting from the frequency regulation maneuver moment, the end time of the second frequency regulation cycle is taken as the frequency regulation compensation execution time.

[0066] The start time is the frequency regulation maneuver moment, and the end time of the second frequency regulation cycle is the frequency regulation compensation execution moment. In this embodiment, the total duration of the first and second frequency regulation cycles is less than the frequency regulation assessment cycle. For example, the first frequency regulation cycle is 10s and the second frequency regulation cycle is 15s. If the active power changes 5 seconds after the frequency anomaly occurs, then the 20th second is taken as the frequency regulation compensation execution moment. That is, the possible time for the power station to self-regulate (i.e., the first frequency regulation cycle), the waiting time (the second frequency regulation cycle), and the executable time for frequency regulation compensation adjustment (the remaining time in the frequency regulation assessment cycle excluding the first and second frequency regulation cycles) are reserved.

[0067] Step S313: Calculate the frequency adjustment compensation power based on the time when the frequency anomaly occurred, the time of the frequency adjustment maneuver, the time of the frequency adjustment compensation execution, the frequency adjustment assessment cycle, the operating data, and the static parameters.

[0068] Based on the time of frequency anomaly occurrence, frequency modulation maneuver time, frequency modulation compensation execution time, frequency modulation assessment cycle, operating data and static parameters, the frequency modulation compensation power is calculated, specifically including steps S3131-S3134.

[0069] Step S3131: Calculate the frequency modulation maneuver power based on the time when the frequency anomaly occurred, the time of the frequency modulation maneuver, and the corresponding active power.

[0070] Calculate the frequency modulation maneuver power based on the time of the frequency anomaly, the time of the frequency modulation maneuver, and the corresponding active power. For example, In the formula, This refers to the active power of the unit experiencing a frequency anomaly at the moment of frequency regulation maneuver. This represents the active power of the unit at the moment the frequency anomaly occurred.

[0071] Step S3132: Calculate the missing frequency modulation power based on the time when the frequency anomaly occurred, the time when the frequency modulation compensation was executed, the frequency deviation, the static parameters, the frequency modulation maneuvering power, and the frequency modulation assessment cycle.

[0072] In this embodiment, the missing frequency modulation power is calculated through steps A-D.

[0073] Step A: Calculate the theoretical power contribution of the second frequency modulation based on the time when the frequency anomaly occurred, the time when the frequency modulation compensation was executed, the frequency deviation, and the static parameters.

[0074] Based on the time of the frequency anomaly, the time of frequency regulation compensation execution, the frequency deviation, and static parameters, the theoretical contribution of the second frequency regulation is calculated to characterize the power generation that the unit should generate from the time of the frequency anomaly to the time of frequency regulation compensation execution. For example, In the formula, The time when the frequency anomaly occurred Until the frequency modulation compensation execution time The corresponding second frequency modulation theoretical contribution of electricity, The active power deviation at different times is expressed by the formula. calculate, The frequency deviation at each moment The rated frequency of the power grid. This is the frequency modulation droop coefficient. This is the rated capacity.

[0075] Step B: Calculate the actual power contribution of the second frequency modulation based on the time when the frequency anomaly occurred, the time when the frequency modulation compensation was executed, and the frequency modulation maneuver power.

[0076] Based on the time of the frequency anomaly, the time of frequency regulation compensation execution, and the frequency regulation maneuver power, the actual power contribution of the second frequency regulation is calculated to characterize the actual power generation of the unit from the time of the frequency anomaly to the time of frequency regulation compensation execution. For example, In the formula, The time when the frequency anomaly occurred Until the frequency modulation compensation execution time The corresponding second frequency modulation actually contributes electricity.

[0077] Step C: Determine the time elapsed for the frequency modulation assessment based on the time when the frequency anomaly occurred, the time when the frequency modulation compensation was executed, and the frequency modulation assessment cycle.

[0078] The time elapsed for frequency regulation assessment is determined based on the time of the frequency anomaly occurrence, the time of frequency regulation compensation execution, and the frequency regulation assessment cycle. For example, In the formula, The time when the frequency anomaly occurred Until the frequency modulation compensation execution time The length of time already elapsed, i.e. the time already used for the frequency modulation assessment.

[0079] Step D: Calculate the missing frequency modulation power based on the theoretical power contribution of the second frequency modulation, the actual power contribution of the second frequency modulation, the frequency modulation assessment cycle, and the time elapsed for the frequency modulation assessment.

[0080] Based on the theoretical contribution of the second frequency regulation, the actual contribution of the second frequency regulation, the frequency regulation assessment period, and the time already used for the frequency regulation assessment, the missing power for frequency regulation is calculated to characterize the amount of power generation that the unit needs to compensate for during the remaining time of the frequency regulation assessment period. For example, In the formula, Missing power for frequency modulation This is the frequency adjustment assessment cycle.

[0081] Step S3133: Determine the remaining time for frequency modulation assessment based on the time when the frequency anomaly occurred, the time when frequency modulation compensation was executed, and the frequency modulation assessment cycle.

[0082] Based on the time of the frequency anomaly, the time of frequency regulation compensation execution, and the frequency regulation assessment cycle, the remaining time for frequency regulation assessment is determined to ascertain the available time for the unit to perform compensation adjustments. For example, In the formula, The remaining time for the frequency adjustment assessment.

[0083] Step S3134: Calculate the frequency modulation compensation power based on the missing frequency modulation power, the remaining time of the frequency modulation assessment, and the frequency modulation maneuver power.

[0084] Based on the missing frequency regulation power, the remaining time for the frequency regulation assessment, and the frequency regulation maneuvering power, the frequency regulation compensation power is calculated to determine the active power that the unit should increase at each moment during the remaining time of the frequency regulation assessment. For example, the frequency regulation compensation power is calculated using the formula... calculate.

[0085] Furthermore, step S31 also includes steps S314-S3145.

[0086] Step S314: Starting from the moment the frequency anomaly occurs, if the active power does not change within the first frequency modulation cycle, then starting from the moment the frequency anomaly occurs, the end time of the second frequency modulation cycle shall be used as the execution time for frequency modulation compensation.

[0087] Starting from the moment the frequency anomaly occurs, if the active power does not change within the first frequency regulation cycle, that is, the unit experiencing the frequency anomaly does not perform self-adjustment, or the self-adjustment does not affect the active power, then the frequency regulation compensation execution time is taken as the moment the frequency anomaly occurs and the end time of the second frequency regulation cycle.

[0088] Step S315: Calculate the frequency compensation power based on the time of frequency anomaly occurrence, frequency modulation compensation execution time, frequency modulation assessment cycle, operating data, and static parameters.

[0089] First, referring to step S3132, calculate the missing frequency regulation power based on the time when the frequency anomaly occurred, the time when frequency regulation compensation was executed, the frequency deviation, static parameters, frequency regulation motor power, and frequency regulation assessment cycle.

[0090] Secondly, referring to step S3133, determine the remaining time for frequency adjustment assessment based on the time when the frequency anomaly occurred, the time when frequency adjustment compensation was executed, and the frequency adjustment assessment cycle.

[0091] Finally, based on the missing frequency modulation power and the remaining time for the frequency modulation assessment, the frequency modulation compensation power is calculated. For example, the formula is used. Calculate the frequency modulation compensation power.

[0092] Step S32: If the first scheduling compensation adjustment is initiated, the first scheduling compensation power is calculated based on the active power, the power grid assessment indicators, and the grid connection scheduling instruction.

[0093] In this embodiment, the scheduling assessment cycle corresponding to the power grid assessment indicators is divided according to natural time, and the moment when the judgment result of step S22 is the start of the first scheduling compensation adjustment is taken as the first scheduling compensation execution time.

[0094] First, based on active power, grid performance indicators, and grid connection dispatch instructions, the cumulative dispatch deviation corresponding to the execution time of the first dispatch compensation is calculated. For example, the cumulative dispatch deviation corresponding to the execution time of the first dispatch compensation is calculated using the formula... Calculate, where, This represents the scheduling deviation at the k-th time point after the start of the scheduling assessment period. This indicates that the execution time of the first scheduling compensation is the a-th moment after the start of the scheduling assessment cycle.

[0095] Secondly, based on the scheduling assessment cycle and the execution time of the first scheduling compensation, the remaining time for scheduling assessment is determined, which is used to determine the available time for the unit to perform compensation adjustments. For example, In the formula, To schedule the remaining time for the assessment, For the scheduling assessment cycle, From the start of the scheduling assessment period to the execution time of the first scheduling compensation. The length of time.

[0096] Finally, based on the grid connection dispatch instructions, the remaining time for dispatch assessment, grid assessment indicators, and cumulative dispatch deviation, the first dispatch compensation power is calculated to determine the active power that the generating units should increase at each moment during the remaining time of the dispatch assessment. For example, In the formula, For the first scheduling compensation power, For power grid assessment indicators revised The planned power for the corresponding scheduling assessment cycle at any given time is determined by the formula. or Calculation (based on the direction of cumulative scheduling deviation, with the goal of minimizing the first scheduling compensation power), where This is a daily load planning curve assessment indicator in the power grid performance evaluation system. for The planned power for the corresponding scheduling assessment cycle at any given time.

[0097] Furthermore, the compensation power also includes the second scheduling compensation power, and step S3 further includes: Step S33: If the second dispatch compensation adjustment is initiated, the second dispatch compensation power is calculated based on the active power, power grid assessment indicators and grid connection dispatch instructions.

[0098] In this embodiment, the power dispatch cycle corresponding to the power grid assessment indicators is divided according to natural time, and the moment when the judgment result of step S24 is the start time of the second dispatch compensation adjustment is taken as the second dispatch compensation execution time.

[0099] If the second dispatch compensation adjustment is initiated, the second dispatch compensation power is calculated based on active power, grid performance indicators, and grid connection dispatch instructions. For example, the second dispatch compensation power at each time point... In the formula, For the second scheduling compensation execution time The corresponding power deviation can be referred to step S24, Power Deviation. The method of determination, according to The active power and corresponding grid connection dispatch instructions within the time frame are determined. For the remaining time of the power dispatch cycle, there is , For power dispatching cycle, From the start time of the power dispatch cycle to the execution time of the second dispatch compensation The length of time.

[0100] Furthermore, to improve the likelihood of meeting planned power demands, planned power is allocated non-linearly within the power dispatching cycle, and a second dispatch compensation power is determined for each time period, for example, In order to approach the planned power volume corresponding to the power dispatch cycle in advance.

[0101] Step S3 enables accurate calculation of compensation power, which, in conjunction with step S4, enables active correction of the power plant unit's deviation.

[0102] Step S4: Based on the compensation power, determine the corresponding adjustment signal, and adjust the operating data according to the adjustment signal.

[0103] Based on the compensation power, the corresponding adjustment signal is determined, and the operating data is adjusted according to the adjustment signal. If the power station is in pulse control mode, the corresponding output pulse (i.e. the operating data to be adjusted) is determined according to the compensation power. If the power station adopts governor guide vane control, the corresponding governor guide vane opening (i.e. the operating data to be adjusted) is determined according to the compensation power to adjust the unit operation so that the actual active power meets the grid dispatch instructions and grid assessment indicators.

[0104] Determining the corresponding adjustment signal based on the compensation power can be achieved using the power plant's existing control system or historical operating data. For example, a mapping relationship can be established between the output pulse width or governor guide vane opening of each unit and its active power. Based on the unit's active power and compensation power at the current moment, the corresponding output pulse width or governor guide vane opening can be determined using this mapping relationship. Furthermore, the mapping relationship can be dynamically adjusted by comparing the actual change in active power after each adjustment signal with the compensation power. For instance, if the effect of an adjustment is flawed (the actual change in active power does not match the compensation power), such as a 300-millisecond pulse width resulting in an actual change in active power greater than the compensation power (i.e., over-adjustment), then the corresponding output pulse width in the mapping relationship can be reduced. This ensures that the output pulse width is reduced in the next adjustment signal determination, for example, by 200 milliseconds. This process is repeated, updating the mapping relationship in real time. In other embodiments, it can also be updated periodically.

[0105] In this embodiment, taking speed governor guide vane control as an example, the operating data also includes the speed governor guide vane opening, and step S4 includes step S41 or step S42.

[0106] Step S41: Determine the adjustment signal corresponding to the frequency modulation unit based on the frequency modulation compensation power, and adjust the speed governor guide vane opening corresponding to the frequency modulation unit according to the adjustment signal at the frequency modulation compensation execution time; wherein, the frequency modulation unit is the unit that triggers the frequency modulation compensation adjustment.

[0107] For units that trigger frequency regulation compensation adjustment, i.e. frequency regulation units, the corresponding adjustment signal is determined according to the corresponding frequency regulation compensation power. Based on the adjustment signal, the opening of the guide vanes of the speed governor of the frequency regulation unit is adjusted at the time of frequency regulation compensation execution, so that the frequency regulation unit compensates for active power equivalent to the frequency regulation compensation power, thereby increasing the possibility of achieving the frequency regulation assessment target within the frequency regulation assessment cycle.

[0108] In this embodiment, the speed governor guide vane opening of the frequency modulation unit is adjusted according to the adjustment signal at the frequency modulation compensation execution time. The adjustment signal can be transmitted to the frequency modulation unit, and the frequency modulation unit can adjust the speed governor guide vane opening of its own unit at the frequency modulation compensation execution time.

[0109] Step S42: Determine the adjustment signal corresponding to the first target unit based on the first scheduling compensation power, and adjust the guide vane opening of the governor corresponding to the first target unit according to the adjustment signal; wherein, the first target unit is determined according to the scheduling priority of each unit.

[0110] In this embodiment, a first target unit is determined from all the units of the power plant according to the scheduling priority of each unit. The first target unit performs compensation regulation to avoid frequent regulation of all units of the power plant. Then, the regulation signal corresponding to the first target unit is determined according to the first scheduling compensation power, and the opening of the governor guide vane corresponding to the first target unit is adjusted according to the regulation signal.

[0111] Furthermore, the static parameters also include the unit's given active power. Based on the unit's given active power, the first dispatch compensation power, and the dispatch priority of each unit, the first target unit is determined. For example, from all units, the unit with the highest dispatch priority is selected. It is then determined whether the sum of the active power of this unit and the first dispatch compensation power is greater than the unit's given active power. If it is greater, the unit with the second highest dispatch priority is selected. It is then determined whether the sum of the current actual active power of this unit and the first dispatch compensation power is greater than the unit's given active power. If it is not greater, the unit with the second highest dispatch priority is determined as the first target unit, and compensation adjustment is performed on a single unit to minimize the number of units required for a single compensation adjustment at the power station. In other embodiments, the units with the highest scheduling priority and the second highest scheduling priority can both be used as the first target units. The unit with the highest scheduling priority determines the corresponding adjustment signal according to the unit's given active power, and the unit with the second highest scheduling priority determines the corresponding adjustment signal according to the remaining compensation power. The remaining compensation power refers to the first scheduling compensation power minus the compensation power of the unit with the highest scheduling priority. The compensation power is the difference between the unit's given active power and the active power.

[0112] In this embodiment, the scheduling priority of each unit is determined through step E-E: Step E: Determine the regulation speed and regulation accuracy of each unit based on the power plant's historical operating data and corresponding historical regulation signals.

[0113] Based on the power plant's historical operating data and corresponding historical regulation signals, the regulation speed and regulation accuracy of each unit are determined. For example, the regulation speed of each unit is calculated from its historical operating data and historical regulation signals, taking the time required to achieve the primary frequency regulation target or daily load plan curve target after each received regulation signal and subsequent compensation regulation within the frequency regulation assessment cycle or dispatch assessment cycle. The average of all these times determines the corresponding regulation speed. The regulation accuracy of each unit is determined from its historical operating data and historical regulation signals, by statistically analyzing the difference between the active power change after each compensation regulation and the first dispatch compensation power or frequency regulation compensation power within the frequency regulation assessment cycle or dispatch assessment cycle after each received regulation signal. The average of all these differences determines the corresponding regulation accuracy.

[0114] Step F: Determine the scheduling priority of each unit based on the adjustment speed and adjustment accuracy.

[0115] In this embodiment, the adjustment priority includes speed priority and accuracy priority, which are established according to the adjustment speed from fast to slow and the adjustment accuracy from low to high, respectively.

[0116] Furthermore, the status data also includes the AGC operation mode. The assessment type is determined based on the AGC operation mode, and the priority type for selecting the first target unit is determined based on the assessment type. For example, if the assessment type is determined to be accuracy assessment based on the AGC operation mode, then the first target unit is selected based on accuracy priority.

[0117] In other embodiments, a weighted summation can be performed based on the adjustment speed and adjustment accuracy, and the scheduling priority can be determined based on the summation result.

[0118] In other embodiments, the scheduling priority can be determined based on the running time of each unit, for example, the shorter the running time, the higher the scheduling priority; or the scheduling priority of each unit can be set to be the same, and one unit can be selected from all units as the first target unit.

[0119] Furthermore, step S4 also includes: Step S43: Determine the adjustment signal corresponding to the second target unit based on the second scheduling compensation power, and adjust the guide vane opening of the governor corresponding to the second target unit according to the adjustment signal.

[0120] In this embodiment, a second target unit is determined from all the units of the power plant according to the scheduling priority of each unit. The second target unit performs compensation regulation. Then, the regulation signal corresponding to the second target unit is determined according to the second scheduling compensation power. The opening of the governor guide vane corresponding to the second target unit is adjusted according to the regulation signal.

[0121] Further, based on the given active power of the generating units, the second scheduling compensation power, and the scheduling priority of each generating unit, a second target generating unit is determined. In this embodiment, a number of second target generating units is set. From all generating units, they are sorted according to scheduling priority. A corresponding number of generating units are selected according to the number of second target generating units, and the second scheduling compensation power is evenly allocated. The adjustment signal corresponding to each generating unit is determined. If the sum of the active power of each generating unit and the second scheduling compensation power allocated to that unit is greater than the given active power of that generating unit, the number of second target generating units is increased.

[0122] In other embodiments, according to scheduling priority, the unit with the highest scheduling priority is first selected. The difference between the unit's given active power and its current actual active power is calculated to see if it is greater than the second scheduling compensation power. If not, the unit with the highest scheduling priority is determined as the second target unit, and the compensation power allocated to this unit is the difference between its given active power and its current actual active power. Then, the unit with the second highest scheduling priority is selected, and the difference between its given active power and its current actual active power is calculated to see if it is greater than the remaining power of the second scheduling compensation power (i.e., the difference in compensation power already allocated to existing second target units). If not, the unit with the second highest scheduling priority is also determined as the second target unit, and the compensation power allocated to this unit is determined. The process continues to select units with the next highest scheduling priority until the difference between the given active power and the current actual active power of a certain unit is greater than the remaining power of the second scheduling compensation power. The compensation power allocated to this unit is the remaining power of the second scheduling compensation power, thus ensuring that the compensation power of all second target units satisfies the second scheduling compensation power.

[0123] Further steps S41, S42, and S43 involve checking the adjustment range when determining the corresponding adjustment signal to ensure that the adjustment of each unit is within the safe operating limit of the unit. A maximum safe adjustment amount can also be set for each unit to avoid abnormal situations such as excessive adjustment or overload.

[0124] Furthermore, after adjusting the operating data, continuous monitoring is performed. For example, steps S1 and S2 are executed every 0.5 seconds. If the corresponding grid assessment indicators are not met, steps S3 and S4 are executed. If the corresponding grid assessment indicators are met, steps S3 and S4 are stopped, and the adjusted state is maintained to continue operation. This verifies the adjustment effect or issues a second adjustment signal, thereby improving the power plant's compliance rate with grid connection dispatch instructions and grid assessment indicators.

[0125] This invention provides a power plant grid-connected operation optimization compensation system, such as... Figure 2 As shown, it includes: The communication acquisition module is used to collect the static parameters and operating data of the power plant and obtain grid connection dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit; The optimized compensation calculation module is used to determine whether to initiate compensation adjustment based on the operating data, power grid assessment indicators, and / or the grid connection dispatch instructions; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment; The optimized compensation calculation module is also used to calculate the compensation power based on the static parameters, the operating data, the power grid assessment indicators and / or the grid connection dispatching instructions if the compensation adjustment is initiated. The optimization compensation calculation module is also used to determine the corresponding adjustment signal based on the compensation power; The local terminal for implementing the adjustment is used to adjust the operating data according to the adjustment signal.

[0126] The power plant grid-connected operation optimization and compensation system provided in this embodiment is decoupled from the power plant's existing control system. During normal operation, it only monitors the power plant's operating status, real-time monitoring unit frequency and dispatch deviations and comparing them with grid performance indicators. When it determines that compensation adjustment is needed, it calculates the required compensation power, issues adjustment signals, and precisely adjusts the power plant's unit operation to proactively correct deviations. Through pre-judgment, in-process correction, and post-verification, it solves the lag problem of traditional post-assessment models, deeply integrating the indicator assessment algorithm with unit control without interfering with the normal operation of the original control system. This ensures unit safety, reduces economic losses, and improves the grid-connected operation performance of the hydropower station.

[0127] The above-described method and system embodiments are based on the same principles, and their related aspects can be referenced from each other to achieve the same technical effects. For specific implementation processes, please refer to the foregoing embodiments, which will not be repeated here.

[0128] Furthermore, the communication acquisition module adopts a multi-protocol compatible design, supporting power industry standard communication protocols such as Modbus and IEC61850, enabling seamless integration with various existing systems in the power plant without requiring modifications to the original systems. The communication acquisition module is equipped with a data caching function; when communication is interrupted, it caches the data from the most recent 10 minutes, synchronizing it to the computing module upon communication resumption to prevent data loss.

[0129] Furthermore, the optimized compensation calculation module employs a high-performance processor to ensure real-time calculation, enabling it to complete data processing and assessment indicator calculations within one second. Simultaneously, the optimized compensation calculation module includes a calculation update module, which can flexibly update the assessment algorithm parameters according to adjustments made by the power grid management department to the assessment standards, adapting to the assessment requirements of different regions and periods. In addition, the optimized compensation calculation module has data storage capabilities, recording unit operating data, assessment indicators, and compensation adjustment records with a storage period of no less than one year, providing data support for subsequent fault diagnosis and algorithm optimization.

[0130] Furthermore, the optimized compensation calculation module receives the compensation power and converts it into an adjustable signal recognizable by the unit's speed control system and excitation system, such as an analog signal (4-20mA) or a pulse signal. This signal is then output to the corresponding local control execution terminal to achieve precise adjustment of the unit's output. The optimized compensation calculation module also includes a command verification function to check the rationality of the output control signal, preventing abnormal unit operation due to incorrect control signal commands. Simultaneously, it monitors the execution of the control signal in real time; if execution fails (e.g., the speed controller does not respond), it immediately sends a feedback signal or outputs a warning signal.

[0131] This embodiment provides another power plant grid-connected operation optimization and compensation system. Taking a 100MW hydropower unit as an example, the specific operation process of the system is illustrated. The communication acquisition module is used to collect the static parameters and operating data of the power plant and obtain grid-connected dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit. The optimized compensation calculation module is used to determine whether to initiate compensation adjustment based on the operating data, power grid assessment indicators, and / or the grid connection dispatch instructions; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment; The optimized compensation calculation module is also used to calculate the compensation power based on the static parameters, the operating data, the power grid assessment indicators and / or the grid connection dispatching instructions if the compensation adjustment is initiated. The optimization compensation calculation module is also used to determine the corresponding adjustment signal based on the compensation power; The adjustment is executed at the local terminal. 1) System Setup: An optimized compensation system is set up, including a communication acquisition module, an optimized compensation calculation module, and a local terminal for regulation execution. The communication acquisition module adopts the IEC61850 protocol and establishes communication connections with the power plant's existing unit monitoring system, PMU system, governor system, and excitation system. The optimized compensation calculation module is loaded with two detailed assessment requirements: a primary frequency regulation small disturbance contribution rate threshold K=0.35, a large disturbance contribution rate threshold K=0.60, an allowable deviation of ±2% for the daily load plan curve assessment index, and a frequency anomaly assessment coefficient of 4 times.

[0132] 2) Data Acquisition: Real-time acquisition of static parameters and operating data of the unit, including: given active power 100MW, actual active power 99.5MW, grid frequency 50.02Hz, bus voltage 110kV, guide vane opening 80%, reactive power output 20Mvar, power factor 0.98; dispatch command is daily load plan curve 100MW, AGC is running in tracking plan mode, and the commissioning rate is 100%.

[0133] 3) Real-time calculation - Normal scenario handling: The current grid frequency is 50.02Hz, which is within the normal range. The daily load plan curve deviation is 0.5MW, which does not exceed the allowable deviation of ±2% (2MW), so there is no need to trigger compensation adjustment. At the same time, the grid frequency changes are monitored, and no disturbance occurs. The primary frequency regulation assessment indicators are normal. 4) Real-time calculation - disturbance scenario handling: If a small disturbance occurs in the power grid, and the frequency drops to 49.92Hz (the spectrum deviation is within the small disturbance range), the first frequency regulation is initiated. The optimization compensation calculation module calculates the theoretical contribution of the first frequency regulation based on the real-time collected Pt (actual active power) and P0 (average output of 99.5MW in the 3 seconds before the action). Actual power contribution of the first frequency modulation If, after 30 seconds, the contribution rate K = 0.30 < 0.35 (target value), it is predicted that the automatic adjustment will fail. The compensation power for each moment of the remaining assessment time of 30 seconds is calculated to be 0.1MW. An adjustment signal is sent to the local terminal of the adjustment execution to control the speed governor to increase the active power output by 0.1MW for 30 seconds.

[0134] 5) Correction verification: Adjust the output of the local terminal control speed regulator and optimize the compensation calculation module to verify the contribution rate every 0.5 seconds. After 30 seconds, the contribution rate K=0.36≥0.35, which meets the qualified standard. Stop the compensation adjustment and the frequency regulation test is qualified.

[0135] 6) Load curve deviation handling: If the actual active power generated by the unit in a certain minute is 103MW, the daily planned output is 100MW, the deviation is 3MW, which exceeds the allowable deviation of 1MW. If there are 0.2 minutes left in the current minute, calculate the compensation power ΔP=1 / 0.2=5MW. The execution module controls the speed governor to reduce the active power output by 5MW. After 0.2 minutes, the actual active power generated drops to 102MW, the deviation is 2MW, and it returns to the allowable range. The assessment for this minute is qualified.

[0136] Through the above implementation methods, the pass rate of primary frequency regulation and daily load planning curve assessment of the 100MW hydropower unit has been increased to over 99%, significantly reducing the economic losses in assessment and verifying the effectiveness and practicality of the optimization method of the present invention.

[0137] In summary, the power plant grid-connected operation optimization compensation method and system of this invention has at least one of the following beneficial effects: By collecting static parameters and operational data of the power plant and obtaining grid-connected dispatch instructions, the system analyzes the power plant's operational status in real time. Based on operational data, grid performance indicators, and / or grid-connected dispatch instructions, it analyzes whether the power plant needs to initiate frequency regulation compensation adjustment or primary dispatch compensation adjustment. This enables timely response to primary frequency regulation and the power plant's daily load plan curve, real-time monitoring of deviations from performance indicators, and timely detection of potential performance failures, thereby improving the power plant's ability to anticipate performance indicators. Furthermore, for situations requiring compensation adjustment, the system calculates compensation power based on static parameters, operational data, grid performance indicators, and / or grid-connected dispatch instructions. It accurately calculates the deviation between the power plant's current operational status and performance indicators, thereby generating corresponding adjustment signals to adjust the power plant's operational data. Ultimately, this achieves proactive and precise correction, enhancing the power plant's real-time optimization and compensation capabilities, increasing the pass rate within the assessment period, reducing economic losses from assessments, and improving the compliance of the power plant's grid-connected operation.

[0138] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0139] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for optimizing compensation during grid-connected operation of a power plant, characterized in that, include: Collect static parameters and operating data of the power plant to obtain grid connection dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit; Based on the operational data, power grid performance indicators, and / or the grid connection dispatch instructions, determine whether to initiate compensation adjustment; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment; If the compensation adjustment is initiated, the compensation power is calculated based on the static parameters, the operating data, the power grid assessment indicators, and / or the grid connection dispatching instructions. Based on the compensation power, a corresponding adjustment signal is determined, and the operating data is adjusted according to the adjustment signal; Based on the operational data, power grid performance indicators, and / or the grid connection dispatch instructions, determine whether to initiate compensation regulation, including: Based on the frequency deviation and the power grid assessment indicators, determine whether a frequency anomaly has occurred. If the frequency anomaly has occurred, calculate the frequency regulation contribution rate. Based on the frequency regulation contribution rate and the power grid assessment indicators, determine whether to initiate the frequency regulation compensation adjustment. The frequency modulation contribution rate is calculated through the following steps: For each moment after the frequency anomaly occurs, a first active power deviation is calculated based on the corresponding frequency deviation and the static parameters; wherein, the static parameters include the grid rated frequency, frequency regulation droop coefficient, and rated capacity; Based on the time of the frequency anomaly and each of the first active power deviations, calculate the theoretical power contribution of the first frequency modulation at each time. Based on the time when the frequency anomaly occurred and the active power at each time, calculate the actual power contribution of the first frequency modulation at each time. The frequency modulation contribution rate is calculated based on the theoretical and actual power contributions of the first frequency modulation.

2. The method according to claim 1, characterized in that, Determining whether to initiate compensation regulation based on the operational data, power grid performance indicators, and / or the grid connection dispatch instructions further includes: Based on the active power and the grid connection dispatching instruction, the dispatching deviation is calculated, and based on the dispatching deviation and the power grid assessment indicators, it is determined whether to initiate the first dispatching compensation adjustment.

3. The method according to claim 2, characterized in that, The operational data also includes status data; after determining whether to initiate the first scheduling compensation adjustment, it further includes: If the determination result is to initiate the first scheduling compensation adjustment, then based on the status data, determine whether the power station is in the frequency regulation compensation state; if it is in the frequency regulation compensation state, then update the determination result to not initiate the first scheduling compensation adjustment.

4. The method according to claim 2, characterized in that, The compensation power includes frequency modulation compensation power and first scheduling compensation power; If the compensation adjustment is initiated, the compensation power is calculated based on the operating data, power grid performance indicators, and / or the grid connection dispatch instruction, including: If the frequency regulation compensation adjustment is initiated, the frequency regulation compensation power is calculated based on the active power, the frequency deviation, and the power grid assessment indicators, and the corresponding frequency regulation compensation execution time is determined. If the first scheduling compensation adjustment is initiated, the first scheduling compensation power is calculated based on the active power, the power grid assessment indicators, and the grid connection scheduling instruction.

5. The method according to claim 4, characterized in that, If the frequency regulation compensation adjustment is initiated, the frequency regulation compensation power is calculated based on the active power, the frequency deviation, and the power grid assessment indicators, and the corresponding frequency regulation compensation execution time is determined, including: Starting from the moment the frequency anomaly occurs, if the active power changes within the first frequency modulation cycle, the moment when the active power changes shall be taken as the frequency modulation maneuver moment. Starting from the frequency modulation maneuver time, the end time of the second frequency modulation cycle is taken as the frequency modulation compensation execution time; The frequency adjustment compensation power is calculated based on the time when the frequency anomaly occurs, the time of the frequency adjustment maneuver, the time of the frequency adjustment compensation execution, the frequency adjustment assessment cycle, the operating data, and the static parameters.

6. The method according to claim 5, characterized in that, Based on the time of the frequency anomaly occurrence, the time of the frequency modulation maneuver, the time of the frequency modulation compensation execution, the frequency modulation assessment cycle, the operating data, and the static parameters, the frequency modulation compensation power is calculated, including: Calculate the frequency modulation maneuver power based on the time of the frequency anomaly, the time of the frequency modulation maneuver, and the corresponding active power; The missing power for frequency regulation is calculated based on the time when the frequency anomaly occurred, the time when the frequency regulation compensation was executed, the frequency deviation, the static parameters, the frequency regulation maneuvering power, and the frequency regulation assessment cycle. The remaining time for the frequency adjustment assessment is determined based on the time when the frequency anomaly occurred, the time when the frequency adjustment compensation was executed, and the frequency adjustment assessment cycle. The frequency modulation compensation power is calculated based on the missing frequency modulation power, the remaining time of the frequency modulation assessment, and the frequency modulation maneuver power.

7. The method according to claim 6, characterized in that, Based on the time of the frequency anomaly, the time of frequency modulation compensation execution, the frequency deviation, the static parameters, the frequency modulation maneuvering power, and the frequency modulation assessment cycle, the missing frequency modulation power is calculated, including: The theoretical power contribution of the second frequency modulation is calculated based on the time when the frequency anomaly occurs, the time when the frequency modulation compensation is executed, the frequency deviation, and the static parameters. The actual power contribution of the second frequency modulation is calculated based on the time when the frequency anomaly occurs, the time when the frequency modulation compensation is executed, and the frequency modulation maneuver power. The time elapsed for the frequency modulation assessment is determined based on the time when the frequency anomaly occurred, the time when the frequency modulation compensation was executed, and the frequency modulation assessment cycle. The missing power of frequency regulation is calculated based on the theoretical power contribution of the second frequency regulation, the actual power contribution of the second frequency regulation, the frequency regulation assessment cycle, and the time already used for the frequency regulation assessment.

8. The method according to claim 4, characterized in that, The operating data also includes the governor guide vane opening; Based on the compensation power, a corresponding adjustment signal is determined, and the operating data is adjusted according to the adjustment signal, including: Based on the frequency modulation compensation power, the adjustment signal corresponding to the frequency modulation unit is determined, and the speed governor guide vane opening corresponding to the frequency modulation unit is adjusted according to the adjustment signal at the frequency modulation compensation execution time; wherein, the frequency modulation unit is the unit that triggers the frequency modulation compensation adjustment; Alternatively, based on the first scheduling compensation power, the adjustment signal corresponding to the first target unit is determined, and the opening of the governor guide vane corresponding to the first target unit is adjusted according to the adjustment signal; wherein, the first target unit is determined based on the scheduling priority of each unit.

9. A power plant grid-connected operation optimization compensation system, characterized in that, include: The communication acquisition module is used to collect the static parameters and operating data of the power plant and obtain grid connection dispatch instructions; wherein, the operating data includes the active power and frequency deviation of each unit; The optimized compensation calculation module is used to determine whether to initiate compensation adjustment based on the operating data, power grid assessment indicators, and / or the grid connection dispatch instructions; wherein, the compensation adjustment includes frequency regulation compensation adjustment and first dispatch compensation adjustment; Based on the operational data, power grid performance indicators, and / or the grid connection dispatch instructions, determine whether to initiate compensation regulation, including: Based on the frequency deviation and the power grid assessment indicators, determine whether a frequency anomaly has occurred. If the frequency anomaly has occurred, calculate the frequency regulation contribution rate. Based on the frequency regulation contribution rate and the power grid assessment indicators, determine whether to initiate the frequency regulation compensation adjustment. The frequency modulation contribution rate is calculated through the following steps: For each moment after the frequency anomaly occurs, a first active power deviation is calculated based on the corresponding frequency deviation and the static parameters; wherein, the static parameters include the grid rated frequency, frequency regulation droop coefficient, and rated capacity; Based on the time of the frequency anomaly and each of the first active power deviations, calculate the theoretical power contribution of the first frequency modulation at each time. Based on the time when the frequency anomaly occurred and the active power at each time, calculate the actual power contribution of the first frequency modulation at each time. The frequency modulation contribution rate is calculated based on the theoretical contribution of the first frequency modulation and the actual contribution of the first frequency modulation. The optimized compensation calculation module is also used to calculate the compensation power based on the static parameters, the operating data, the power grid assessment indicators and / or the grid connection dispatching instructions if the compensation adjustment is initiated. The optimization compensation calculation module is also used to determine the corresponding adjustment signal based on the compensation power; The local terminal is adjusted to regulate the operating data according to the adjustment signal.

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