A method, system, device and storage medium for load participation in power system frequency control

Abstract

The application discloses a kind of load participation electric power system frequency control method, system, equipment and storage medium, belong to electric power system safe and stable operation technical field, comprising: obtaining load parameter and calculating comprehensive priority score, according to the comprehensive priority score, load is layered, and layered result is obtained;Frequency deviation and frequency rate of change are obtained, and the first judgment is carried out to frequency deviation and frequency rate of change, and emergency control process is started;Based on the frequency deviation and frequency rate of change, active deficiency and active demand are calculated;The layered result is combined with active deficiency and active demand, and layered removal strategy is generated;According to the removal amount of each layer load according to each layer load removal condition, the removal amount of each layer load is optimized, the second judgment is carried out to the frequency deviation, and additional removal amount is generated according to the judgment result;Response speed is obtained in combination with removal amount, dynamically calculates compensation unit price, generates economic compensation scheme, can quickly suppress frequency collapse, reduces important load mis-cut risk.

Description

Technical Field

[0001] This invention relates to the field of power system safety and stable operation technology, specifically to a method, system, device and storage medium for load participation in power system frequency control. Background Technology

[0002] The stability and security of a power system largely depend on the control of the grid frequency. Grid frequency and voltage are two core parameters for measuring power system stability; any frequency fluctuation can negatively impact grid stability and user production activities. With the rapid growth of renewable energy generation, renewable energy power plants, lacking frequency regulation capabilities, cannot participate in the primary frequency regulation of the grid. This reduces the equivalent inertia of the power system, posing a serious challenge to frequency stability. Traditional low-frequency load shedding (UFLS) schemes rely on fixed-cycle shedding of ordinary loads, which suffers from insufficient response speed, neglect of load characteristics, and rigid economic efficiency.

[0003] While existing technologies incorporate load priority classification, they still rely on static indicators (such as user level) and lack deep coupling with load model parameters. This leads to over-shuffling of high-inertia loads, resulting in economic losses. Furthermore, most methods lack a closed-loop control mechanism integrated with power system frequency stability control (such as stable generator shedding and load shedding). In severe faults, frequency instability can easily occur due to adjustment delays or insufficient capacity. In practical engineering, phase acquisition errors in the rectifier system (such as zero-crossing deviations caused by frequency changes) further deteriorate the control effect, and existing technologies lack effective means to correct such hardware-level nonlinear problems. Therefore, how to integrate dynamic load model parameters and overcome the shortcomings of load-based frequency control technology is a pressing issue in the field of power system frequency regulation technology. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by this invention is: how to integrate dynamic load model parameters to overcome the shortcomings of load participation frequency control technology.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for load participation in power system frequency control, comprising:

[0007] Obtain load parameters and calculate a comprehensive priority score. Based on the comprehensive priority score, stratify the load to obtain the stratification results.

[0008] Obtain the frequency deviation and frequency change rate, make a first judgment on the frequency deviation and frequency change rate, and initiate the emergency control process;

[0009] Based on the frequency deviation and frequency change rate, the active power deficit and active power demand are calculated.

[0010] The stratification results are combined with active power deficit and active power demand to generate a stratified cutoff strategy;

[0011] The amount of load removed from each layer is optimized based on the load removal situation of each layer, a second judgment is made on the frequency deviation, and the amount of load removed is increased according to the judgment result;

[0012] By combining the response speed with the amount of resection, the compensation unit price is dynamically calculated to generate an economic compensation plan.

[0013] As a preferred embodiment of the method for load participation in power system frequency control according to the present invention, the calculation of the comprehensive priority score includes:

[0014] The overall priority score is a weighted sum of the load response level score and the load model parameter score;

[0015] The load model parameter score is a weighted sum of the normalized load model parameters;

[0016] The higher the overall priority score, the higher the priority of the load being removed.

[0017] The beneficial effects of this preferred technical solution are that by comprehensively prioritizing the scoring, the load shedding sequence is accurately ordered, improving the efficiency and economy of frequency control and reducing the risk of erroneous shedding of important loads.

[0018] As a preferred embodiment of the method for load participation in power system frequency control according to the present invention, the first judgment of the frequency deviation and frequency change rate includes:

[0019] Real-time monitoring of frequency deviation and frequency change rate;

[0020] Emergency frequency control is triggered when the frequency deviation is less than the first threshold or the frequency change rate is greater than the second threshold.

[0021] As a preferred embodiment of the method for load participation in power system frequency control according to the present invention, the calculation of active power deficit and active power demand includes:

[0022] The active power deficit is the product of the system's equivalent inertial time constant and the rate of change of frequency at time zero;

[0023] The equivalent inertial time constant of the system is calculated by adding the weighted average inertial constant of the synchronous generator section and the weighted average inertial constant of the new energy unit section, and then dividing by the sum of the rated capacities of the synchronous generator and the new energy unit.

[0024] The active power requirement is the product of the frequency deviation coefficient and the frequency deviation, plus the product of the frequency change rate coefficient and the frequency change rate.

[0025] The beneficial effects of this preferred technical solution are that it accurately calculates the active power deficit and demand, provides a scientific basis for frequency control, and enhances the stability and reliability of the power grid.

[0026] As a preferred embodiment of the method for load participation in power system frequency control according to the present invention, the layered shelving strategy includes:

[0027] The first layer of load shedding uses a solid-state switch. When the frequency deviation is less than the first threshold or the frequency change rate is greater than the second threshold, an optical pulse command is generated and transmitted to the solid-state switch. The shedding amount is the product of the circuit breaker that has been activated and the rated current and voltage on the DC side.

[0028] The second-level load shedding involves sending a power adjustment command to the industrial frequency converter or programmable logic controller. Based on the adjustment command, the output frequency of the frequency converter is adjusted to reduce the load on the controlled equipment and reduce the load power to a preset level.

[0029] The third-level load shedding uses synchronously controlled intelligent circuit breaker commands to shed the load.

[0030] The beneficial effects of this preferred technical solution are that the layered cut-off strategy enables precise and rapid response, ensures grid frequency stability, and reduces economic losses.

[0031] As a preferred embodiment of the method for load participation in power system frequency control according to the present invention, optimizing the load shedding amount for each layer includes:

[0032] The optimal objective function is to minimize the amount of lost load and the compensation cost.

[0033] The system frequency must be greater than or equal to the third threshold and the rate of change of frequency must be greater than or equal to the fourth threshold. The sum of the products of the inertial time parameters of all load layers and the amount of shedding must be less than or equal to the product of the allowable inertial loss threshold of the system and the total load of the system.

[0034] If the frequency deviation after resection does not reach the preset range, the amount of resection is increased in the closed loop.

[0035] The additional cut-off amount is the first multiple of the active demand multiplied by the negative power of the natural exponential function of the time variable and the time constant.

[0036] The beneficial effect of this preferred technical solution is that by optimizing the amount of load shedding, minimizing load loss and compensation costs, it improves the efficiency of power grid frequency restoration.

[0037] As a preferred embodiment of the method for load participation in power system frequency control according to the present invention, the dynamic calculation of compensation unit price includes:

[0038] The compensation unit price is the sum of the basic compensation unit price and the adjustment items;

[0039] The adjustment term is the ratio of the second multiple of the load shedding amount to the required load shedding amount, multiplied by the response speed.

[0040] This invention provides a system for load participation in power system frequency control.

[0041] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a system for load participation in power system frequency control, comprising:

[0042] The stratification module is used to acquire load parameters and calculate a comprehensive priority score, and then stratify the load according to the comprehensive priority score to obtain the stratification result.

[0043] The first judgment module is used to acquire the frequency deviation and the frequency change rate, make a first judgment on the frequency deviation and the frequency change rate, and initiate the emergency control process.

[0044] The calculation module is used to calculate the active power deficit and active power demand based on the frequency deviation and frequency change rate.

[0045] The strategy generation module is used to combine the hierarchical results with active power deficit and active power demand to generate a hierarchical shunting strategy.

[0046] The optimization module is used to optimize the amount of load to be removed from each layer based on the load removal situation of each layer, make a second judgment on the frequency deviation, and add a removal amount based on the judgment result.

[0047] The unit price calculation module is used to dynamically calculate the compensation unit price by combining the response speed with the amount of material removed, and generate an economic compensation plan.

[0048] The present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, characterized in that the processor executes the computer program to implement the steps of a method for load participation in power system frequency control.

[0049] The present invention provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the method for load participation in power system frequency control.

[0050] The beneficial effects of this invention are as follows: By analyzing the operating characteristics of different loads, this invention constructs a dynamic scoring model to calculate the load reduction amount and assigns it to priorities. The optimized load priority sequence is then integrated into the grid's low-frequency load shedding strategy, achieving millisecond-level precise load shedding when the output of new energy wind turbines fluctuates or generators disconnect from the grid. This shortens the frequency recovery time, effectively prevents grid frequency collapse, and reduces the false shedding rate of important loads. Furthermore, by integrating the dynamic compensation mechanism of grid-load demand response and conducting game theory analysis, a market-based compensation pricing model is established to replace the fixed-price compensation model. This not only ensures compatibility with high-proportion new energy power systems but also expands the access capabilities for new loads such as energy storage and electric vehicles. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 The present invention provides an overall flowchart of a method for load participation in power system frequency control according to an embodiment of the present invention. Detailed Implementation

[0053] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0054] Example 1, referring to Figure 1 Table 1 illustrates one embodiment of the present invention, which provides a method for load participation in power system frequency control, comprising:

[0055] S100: Obtain load parameters and calculate the comprehensive priority score, and stratify the load according to the comprehensive priority score to obtain the stratification results;

[0056] S200: Acquire frequency deviation and frequency change rate, make the first judgment on frequency deviation and frequency change rate, and initiate emergency control procedures;

[0057] S300: Calculates active power deficit and active power demand based on frequency deviation and frequency change rate;

[0058] S400: Combine the stratification results with active power deficit and active power demand to generate a stratified cut-off strategy;

[0059] S500: Optimize the amount of load to be removed from each layer based on the load removal situation of each layer, make a second judgment on the frequency deviation, and add the amount of load to be removed based on the judgment result;

[0060] S600: Combines response speed with resection volume to dynamically calculate compensation unit price and generate economic compensation plan.

[0061] It should be noted that by dynamically acquiring load parameters and calculating a comprehensive priority score, accurate load stratification is achieved. Combined with real-time frequency deviation and rate of change, stratified load shedding strategies can be quickly generated and optimized, effectively suppressing frequency collapse and reducing the risk of erroneous shedding of critical loads. Simultaneously, by dynamically calculating the compensation unit price based on load response speed, an economic compensation scheme is generated, significantly reducing economic compensation costs and improving the stability and economy of the power system, making it particularly suitable for high-proportion renewable energy grid scenarios.

[0062] In this embodiment of the invention, step S100 includes the following sub-steps A1-A3;

[0063] In A1: The overall priority score is a weighted sum of the load response level score and the load model parameter score;

[0064] In A2: the load model parameter score is the weighted sum of the normalized load model parameters;

[0065] In A3: The higher the overall priority score, the higher the priority of the load being removed.

[0066] In this embodiment of the invention, a thyristor rectifier is used to achieve DC power supply, operating in a constant current mode under steady-state conditions, exhibiting approximately constant power load characteristics as observed from the grid side. During normal production processes, this load exhibits high stability of operating parameters, and the impact of voltage fluctuations and frequency deviations on its power characteristics is negligible. Compared to traditional rectification technologies, the electrolytic aluminum rectifier system based on semiconductor devices demonstrates significant advantages in regulation performance, specifically manifested in its fast dynamic response rate (response time on the order of milliseconds) and continuously adjustable output power. The inherent thermal inertia effect of the electrolytic cell under high-temperature conditions provides a dual technical benefit: buffering capability for short-term power interruptions and a 10%-30% dispatchable capacity range. In contrast, the dynamic response cycle of typical industrial loads is in the second range. If the system frequency has not recovered to the stable domain after an emergency load shedding operation, multi-stage load shedding will be implemented according to a preset time-power gradient curve. As for special industrial loads such as smelting and chemical industries, due to their significant response delay (typically tens of seconds or even minutes) and the large impact of load shedding, they are usually set as the last targets to be shedding in the system protection strategy.

[0067] Specifically, dynamic load parameters are collected and normalized through smart meters, SCADA systems, and equipment nameplate data.

[0068] Through rotor inertia Determine the load's inertial time constant based on rated speed, system reference capacity, and rated speed. The calculation formula and normalized expression are as follows:

[0069] ,

[0070] ,

[0071] in, The inertial time constant, For rotor inertia, Rated speed, As the system's baseline capacity, The normalized inertial time constant, The minimum value of the inertial time constant can be 1.5s. The maximum value of the inertial time constant can be 6.0 s;

[0072] By statistically analyzing the proportion of motor load in the system, the motor proportionality coefficient is obtained, which is then normalized as follows:

[0073] ,

[0074] in, This is the proportional coefficient of the electric motor. This is the normalized proportional gain of the electric motor.

[0075] In this embodiment of the invention, a comprehensive score for load shedding priority is formulated based on the load level and the model parameters of the dynamic load, expressed as:

[0076] ,

[0077] in, To score the load response level, Scoring of load dynamic model parameters , These are the weighting coefficients for the load response level score and the load dynamic model parameter score, respectively. It can be 0.4. It can be 0.6. A comprehensive scoring system for resection priority;

[0078] Specifically, the scoring criteria for the load response level are as follows: 5 points for millisecond-level loads (such as rectifier loads), 3 points for second-level loads (such as general industrial loads), and 1 point for ordinary loads (such as chemical loads and metallurgical loads). ;

[0079] The load dynamic model parameter score is expressed as follows:

[0080] ,

[0081] in, The normalized inertial time constant, This is the normalized proportional gain of the electric motor. , These are the normalized inertia time constant weights and the normalized motor proportional coefficient weights, respectively, and they satisfy... ,but It can be 0.6. It can be 0.4;

[0082] Comprehensive scoring of resection priority The larger the value, the higher the priority of this load being removed.

[0083] Based on the scoring results, the load is divided into three levels. For the top 20% of the high-priority load, solid-state switches are used to achieve microsecond-level disconnection. For the middle 60% of the load, the power ramp of the load is controlled by a PLC (Programmable Logic Controller) to achieve proportional disconnection and second-level action. For the bottom 20% of the load, the low-priority load can only be selectively disconnected by intelligent circuit breakers when the frequency is severely exceeded.

[0084] It should be noted that by accurately classifying load levels through comprehensive priority scoring and determining the order of load shedding based on load characteristics and dynamic parameters, precise load shedding at the millisecond to second level can be achieved, effectively improving the accuracy and stability of power grid frequency control and reducing the risk of erroneous shedding of important loads.

[0085] In this embodiment of the invention, step S200 includes the following sub-steps B1-B2;

[0086] In B1: Real-time monitoring of frequency deviation and frequency change rate;

[0087] In B2: Emergency frequency control is triggered when the frequency deviation is less than the first threshold or the frequency change rate is greater than the second threshold.

[0088] Specifically, the first threshold is 49.5 Hz, and the second threshold is ±0.5 Hz / s;

[0089] The system monitors frequency deviation and frequency change rate in real time. When the frequency deviation is less than 49.5 Hz or the frequency change rate is greater than ±0.5 Hz / s, emergency frequency control is triggered.

[0090] It should be noted that by setting clear frequency deviation and rate of change thresholds and monitoring the power system status in real time, emergency frequency control can be triggered quickly, effectively preventing abnormal fluctuations in the power grid frequency and ensuring the safe and stable operation of the power grid.

[0091] In this embodiment of the invention, step S300 includes the following sub-steps C1-C3;

[0092] In C1: the active power deficit is the product of the system's equivalent inertial time constant and the rate of change of frequency at time zero;

[0093] In C2: The equivalent inertial time constant of the system is calculated by adding the weighted average inertial constant of the synchronous generator section and the weighted average inertial constant of the new energy unit section, and then dividing by the sum of the rated capacities of the synchronous generator and the new energy unit.

[0094] In C3: the active power demand is the product of the frequency deviation coefficient and the frequency deviation, plus the product of the frequency change rate coefficient and the frequency change rate.

[0095] Specifically, the initial active power deficit and active power demand of the system are calculated based on the frequency deviation, the rate of change of frequency, and the system's equivalent inertial time constant, and are expressed as follows:

[0096] ,

[0097] ,

[0098] ,

[0099] in, Synchronous generator The inertial constant, Synchronous generator Rated capacity, Synchronous generator Start-stop status (1 running / 0 stopped). For new energy units The inertial constant, Respectively, new energy units Rated capacity and start / stop status, The numbers of synchronous generators and new energy generator units are respectively. This is the frequency deviation coefficient (taken as 0.8~1.2). The frequency change rate coefficient (taken as 2~3). The system's equivalent inertial time constant. This represents the initial active power deficit of the system. For the system's active power requirements, For frequency deviation, Rate of change of frequency.

[0100] For example, taking the smelting furnaces of an electrolytic aluminum plant, a machinery manufacturing plant, and a steel plant as examples, based on user level ratings, the cutoff priority scores are 2.192, 1.496, and 0.608 respectively; therefore, when the system detects a sudden drop in frequency (such as...), , When the initial active power deficit of the system is obtained, the system shall proceed in the following steps: first, cut off the electrolytic aluminum load, then the smelting load, and finally, if necessary, cut off the residential load.

[0101] It should be noted that by comprehensively considering frequency deviation, frequency change rate, and system equivalent inertia time constant, the initial active power deficit and active power demand of the system are accurately calculated, providing an accurate quantitative basis for subsequent load shedding strategies and ensuring the accuracy and effectiveness of frequency control.

[0102] In this embodiment of the invention, step S400 includes the following sub-steps D1-D3;

[0103] In D1: The first layer of load shedding uses a solid-state switch. When the frequency deviation is less than the first threshold or the frequency change rate is greater than the second threshold, an optical pulse command is generated and transmitted to the solid-state switch. The shedding amount is the product of the circuit breaker that has been activated and the rated current and voltage on the DC side.

[0104] In D2: The second layer of load shedding is achieved by sending a power adjustment command to the industrial frequency converter or programmable logic controller. Based on the adjustment command, the output frequency of the frequency converter is adjusted to reduce the load on the controlled equipment and reduce the load power to a preset level.

[0105] In D3: The third-level load shedding uses synchronous control intelligent circuit breaker commands to shedding loads.

[0106] In this embodiment of the invention, different shedding methods are selected based on model parameters of different load levels;

[0107] Specifically, for the three-tier load with different priorities:

[0108] The first-level load shedding is achieved by real-time analysis of frequency deviation and frequency change rate signals. When the frequency deviation is less than 49.5Hz or the frequency change rate is greater than ±0.5Hz / s, a turn-off pulse signal is sent to the solid-state circuit breaker (SSCB). The pulse signal is transmitted through an independent optical fiber channel with a delay of <10 microseconds, triggering the IGBT (Insulated Gate Bipolar Transistor) / thyristor device to complete current interruption within 100 microseconds. At the same time, a "frequency-load" mapping table is pre-set in the EMS (Energy Management System). When the frequency exceeds the limit, the target load is automatically matched, and an optical pulse command code is generated, which includes the load ID (number), shedding amount and timestamp, and is sent directly to the target load controller through the optical module.

[0109] The second-level load shedding sends power adjustment commands to the industrial frequency converter or PLC (Programmable Logic Controller) via the Modbus / TCP protocol (communication protocol). The command transmission delay is less than 10 milliseconds, and the command format is as follows:

[0110] ,

[0111] in, The load power at the initial moment, For the rate of power adjustment, For time, In time Load power at any given time;

[0112] After receiving the instruction, the PLC adjusts the output frequency of the inverter and gradually reduces the load according to the curve. At the same time, it monitors the temperature of the molten steel and the inventory status. According to the preset curve, the load power is reduced to the preset level within 1s to 10s. The preset level refers to the dynamic power threshold that the second layer load needs to be reduced to during the shedding process. The dynamic power threshold is determined by the system's active power demand and the actual deficit.

[0113] The third-level load shedding utilizes synchronously controlled intelligent circuit breaker commands to shed loads such as those in the chemical and metallurgical industries when necessary.

[0114] The instructions include: load group ID, cutoff ratio (10%~20%), and execution time window (1s); the TSN (Time Sensitive Network) protocol is adopted to ensure that the synchronous action delay of thousands of smart circuit breaker terminals is less than 50 milliseconds and the maximum cutoff amount in a single batch does not exceed 20% of the total load of the area, and important loads are filtered through load priority scoring; at the same time, real-time electricity price signals are sent to its terminals to provide compensation and encourage it to participate in frequency stabilization regulation when conditions permit.

[0115] It should be noted that by employing a tiered load shedding strategy, appropriate shedding methods can be selected based on different load characteristics, achieving precise load control at the millisecond to second level. This effectively suppresses abnormal frequency fluctuations, reduces the risk of erroneous shedding of critical loads, and lowers economic compensation costs through a dynamic compensation mechanism, thereby improving the stability and economy of the power system.

[0116] In this embodiment of the invention, step S500 includes the following sub-steps E1-E4;

[0117] In E1: The optimal objective function is to minimize the lost load and the compensation cost.

[0118] In E2: The system frequency is greater than or equal to the third threshold and the rate of change of frequency is greater than or equal to the fourth threshold. The sum of the products of the inertial time parameters of all load layers and the amount of shedding is less than or equal to the product of the allowable inertial loss threshold of the system and the total load of the system.

[0119] In E3: If the frequency deviation after resection does not reach the preset range, the resection amount is increased in the closed loop;

[0120] In E4: The additional cut-off amount is the first multiple of the active demand multiplied by the negative power of the natural exponential function of the time variable and the time constant.

[0121] Specifically, based on the load shedding situation, the control strategy is optimized in a closed loop. The objective function and constraints are expressed as follows:

[0122] Objective function:

[0123] ,

[0124] Constraints:

[0125] ,

[0126] The compensation unit price is expressed as follows:

[0127] ,

[0128] The third threshold is 49.5 Hz, and the fourth threshold is -0.2 Hz. The weighting coefficients for minimizing the total load shedding and minimizing the compensation cost are respectively determined through sensitivity analysis. For the first The amount of load removed, The compensation unit price for the corresponding load layer. The threshold for allowable inertial loss of the system. The total system load, For system frequency, The rate of change of frequency, For the first The normalized inertial time constant of the load. For the first The motor proportional coefficient after load normalization. Scoring the resection priority of the corresponding layer load. , The normalized inertial time constant and the normalized motor proportional coefficient are respectively calibrated based on the grid compensation budget.

[0129] The second judgment includes real-time monitoring of frequency recovery. If the frequency deviation after resection does not reach the preset range, which is 50Hz ± 0.2Hz (i.e., 49.8Hz-50.2Hz), then the dynamically added resection amount is expressed as follows:

[0130] ,

[0131] The first multiple is 0.2. For the system's active power requirements, It is a time constant, determined by both system inertia and load response delay. It is an exponentially decaying term. For time, To increase the amount of resection.

[0132] For example, by substituting the normalized load model parameters into the compensation unit price calculation, the compensation unit prices for load shedding at each layer are 0.187 million yuan / MW, 0.276 million yuan / MW, and 1.245 million yuan / MW, as shown in Table 1.

[0133] Table 1 Typical values ​​of model parameters for three types of loads

[0134]

[0135] As shown in Table 1, the method of the present invention can make full use of the characteristics of the load model, which is a significant improvement over the traditional strategy.

[0136] It should be noted that by using closed-loop optimization and dynamic additional cut-off mechanisms, the system frequency is ensured to recover quickly to a safe range, effectively improving the stability and reliability of the power grid, while reducing economic compensation costs and enhancing the power grid's ability to cope with abnormal frequency fluctuations.

[0137] In this embodiment of the invention, step S600 includes the following sub-steps F1-F2;

[0138] In F1: The compensation unit price is the sum of the basic compensation unit price and the adjustment item;

[0139] In F2: The adjustment term is the ratio of the second multiple of the load shedding amount to the load shedding amount, multiplied by the response speed.

[0140] Specifically, real-time electricity price signals are sent to load terminals such as chemical and metallurgical plants, allowing them to proactively reduce the demand for cutting off high-priority loads by temporarily reducing load or delaying electricity consumption. The compensation unit price is dynamically calculated based on their proactive response amount and response speed, expressed as follows:

[0141] ,

[0142] in, Based on the basic compensation unit price, This is the reward coefficient (ranging from 0.5 to 1). This is calculated by comparing the planned and actual load shedding amounts in real time. Load response speed level (level 1~3). To compensate for the unit price, This is for the system's active power requirements.

[0143] It should be noted that by using real-time electricity price signals to incentivize load terminals such as chemical and metallurgical industries to actively respond, dynamically adjust the compensation unit price, increase the enthusiasm of loads to participate in frequency regulation, reduce the demand for high-priority load shedding, and enhance grid stability.

[0144] The above is an illustrative scheme of a method for load participation in power system frequency control according to this embodiment. It should be noted that the technical solution of this system for load participation in power system frequency control and the technical solution of the method for load participation in power system frequency control described above belong to the same concept. Details not described in detail in the technical solution of the system for load participation in power system frequency control in this embodiment can be found in the description of the technical solution of the method for load participation in power system frequency control described above.

[0145] This embodiment describes a system for load participation in power system frequency control, comprising:

[0146] The stratification module is used to acquire load parameters and calculate a comprehensive priority score, and then stratify the load according to the comprehensive priority score to obtain the stratification result.

[0147] The first judgment module is used to acquire the frequency deviation and the frequency change rate, make a first judgment on the frequency deviation and the frequency change rate, and initiate the emergency control process.

[0148] The calculation module is used to calculate the active power deficit and active power demand based on the frequency deviation and frequency change rate.

[0149] The strategy generation module is used to combine the hierarchical results with active power deficit and active power demand to generate a hierarchical shunting strategy.

[0150] The optimization module is used to optimize the amount of load to be removed from each layer based on the load removal situation of each layer, make a second judgment on the frequency deviation, and add a removal amount based on the judgment result.

[0151] The unit price calculation module is used to dynamically calculate the compensation unit price by combining the response speed with the amount of material removed, and generate an economic compensation plan.

[0152] This embodiment also provides a computer device applicable to a method for load participation in power system frequency control, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the method for load participation in power system frequency control as proposed in the above embodiment.

[0153] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements a method for load participation in power system frequency control as proposed in the above embodiments.

[0154] The storage medium proposed in this embodiment and the method for implementing a load participation in power system frequency control proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0155] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0156] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for load participation in power system frequency control, characterized in that, include: Obtain load parameters and calculate a comprehensive priority score. Based on the comprehensive priority score, stratify the load to obtain the stratification results. Obtain the frequency deviation and frequency change rate, make a first judgment on the frequency deviation and frequency change rate, and initiate the emergency control process; Based on the frequency deviation and frequency change rate, the active power deficit and active power demand are calculated. The stratification results are combined with active power deficit and active power demand to generate a stratified cutoff strategy; The amount of load removed from each layer is optimized based on the load removal situation of each layer, a second judgment is made on the frequency deviation, and the amount of load removed is increased according to the judgment result; By combining the response speed with the amount of resection, the compensation unit price is dynamically calculated to generate an economic compensation plan. Layered resection strategies include: The first layer of load shedding uses a solid-state switch. When the frequency deviation is less than the first threshold or the frequency change rate is greater than the second threshold, an optical pulse command is generated and transmitted to the solid-state switch. The shedding amount is the product of the circuit breaker that has been activated and the rated current and voltage on the DC side. The second layer of load shedding involves sending a power adjustment command to the industrial frequency converter or programmable logic controller. Based on the adjustment command, the output frequency of the frequency converter is adjusted to reduce the load on the controlled equipment and reduce the load power to a preset level. The third-level load shedding uses synchronously controlled intelligent circuit breaker commands to shed the load; Optimizing the amount of load removed from each layer includes: The optimal objective function is to minimize the amount of lost load and the compensation cost. The system frequency is greater than or equal to the third threshold and the rate of change of frequency is greater than or equal to the fourth threshold. The sum of the products of the inertial time parameters of all load layers and the amount of shedding is less than or equal to the product of the allowable inertial loss threshold of the system and the total load of the system. If the frequency deviation after resection does not reach the preset range, the amount of resection is increased in the closed loop. The additional cut-off amount is the first multiple of the active demand multiplied by the negative power of the natural exponential function of the time variable and the time constant; The dynamic calculation of the compensation unit price includes: The compensation unit price is the sum of the basic compensation unit price and the adjustment items; The adjustment term is the ratio of the second multiple of the load shedding amount to the required load shedding amount, multiplied by the response speed.

2. The method for load participation in power system frequency control as described in claim 1, characterized in that, The calculation of the overall priority score includes: The overall priority score is a weighted sum of the load response level score and the load model parameter score; The load model parameter score is a weighted sum of the normalized load model parameters; The higher the overall priority score, the higher the priority of the load being removed.

3. A method for load participation in power system frequency control as described in claim 2, characterized in that, The first determination of the frequency deviation and frequency change rate includes: Real-time monitoring of frequency deviation and frequency change rate; Emergency frequency control is triggered when the frequency deviation is less than the first threshold or the frequency change rate is greater than the second threshold.

4. A method for load participation in power system frequency control as described in claim 3, characterized in that, The calculation of active power deficit and active power demand includes: The active power deficit is the product of the system's equivalent inertial time constant and the rate of change of frequency at time zero; The equivalent inertial time constant of the system is calculated by adding the weighted average inertial constant of the synchronous generator section and the weighted average inertial constant of the new energy unit section, and then dividing by the sum of the rated capacities of the synchronous generator and the new energy unit. The active power requirement is the product of the frequency deviation coefficient and the frequency deviation, plus the product of the frequency change rate coefficient and the frequency change rate.

5. A system for load participation in power system frequency control, employing the method for load participation in power system frequency control as described in any one of claims 1 to 4, characterized in that, include: The stratification module is used to acquire load parameters and calculate a comprehensive priority score, and then stratify the load according to the comprehensive priority score to obtain the stratification result. The first judgment module is used to acquire the frequency deviation and the frequency change rate, make a first judgment on the frequency deviation and the frequency change rate, and initiate the emergency control process. The calculation module is used to calculate the active power deficit and active power demand based on the frequency deviation and frequency change rate. The strategy generation module is used to combine the hierarchical results with active power deficit and active power demand to generate a hierarchical shunting strategy. The optimization module is used to optimize the amount of load to be removed from each layer based on the load removal situation of each layer, make a second judgment on the frequency deviation, and add a removal amount based on the judgment result. The unit price calculation module is used to dynamically calculate the compensation unit price by combining the response speed with the amount of material removed, and generate an economic compensation plan.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of a method for load participation in power system frequency control as described in any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a method for load participation in power system frequency control as described in any one of claims 1 to 4.

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