A simulation method and system for flexible load participating in active power automatic control of a power grid

Abstract

The application discloses a simulation method and system for flexible load participating in active power automatic control of a power grid, and the method comprises the following steps: based on a pre-constructed flexible load simulation model, flexible loads with active power control capability of the power grid are aggregated to obtain a flexible load equivalent generator unit; a disturbance of the power grid system is simulated, power adjustment is performed by AGC, and power distribution is performed on all generator units of the power grid; and the flexible load equivalent generator unit performs power control on each flexible load respectively based on the distributed power. The application effectively analyzes the influence of the flexible load of the power grid participating in the active power control of the power grid on the operation of the power grid.

Description

Technical Field

[0001] This invention relates to the field of power system analysis, specifically to a simulation method and system for flexible loads participating in the automatic active power control of the power grid. Background Technology

[0002] With the advancement of smart grid construction and electricity marketization, the proportion of flexible loads with active response capabilities in the power grid is gradually increasing, making power grid operation and control more challenging. Traditional power system active power control typically targets the generation side, implementing automatic active power control for thermal power units, but it cannot simulate the changes in power grid operating characteristics after flexible loads participate in active power control. To effectively analyze the impact of flexible loads participating in power grid active power control on power grid operation, it is necessary to address the issue of simulating the active participation of flexible loads. Summary of the Invention

[0003] To address the aforementioned shortcomings in existing technologies, this invention provides a simulation method for flexible loads participating in automatic active power control (AGC) of a power grid. The method includes: extending the load model of the current power grid simulation system to establish a detailed flexible load simulation model; aggregating all flexible loads with active power control capabilities across the entire grid to establish equivalent generator sets participating in AGC control; simulating system disturbances in the power grid simulation system, with AGC performing automatic power regulation and sending control commands to the power grid simulation system; and performing power control on the flexible loads belonging to the equivalent generators of the flexible loads, returning the control results to the power grid simulation system. This invention overcomes the limitation of traditional power grid simulation systems in not being able to automatically control flexible loads, by extending and establishing a flexible load model with automatic response capabilities, aggregating its characteristics, and then uniformly participating in AGC control, effectively analyzing and evaluating the impact of flexible loads on power grid operation control.

[0004] This invention provides a simulation method for flexible loads participating in automatic active power control of a power grid, specifically including:

[0005] Based on a pre-built flexible load simulation model, flexible loads with active power control capability of the power grid are aggregated to obtain equivalent generator sets for flexible loads.

[0006] When a disturbance occurs in the simulated power grid system, the AGC (Automatic Generator Control) performs power regulation to distribute power to all units in the power grid.

[0007] The equivalent generator set for the flexible load performs power control on each of its respective flexible loads based on the allocated power.

[0008] Preferably, the construction of the flexible load simulation model includes:

[0009] The physical load model in the power grid system is decomposed to obtain flexible loads with active power control capabilities;

[0010] Based on each flexible load and its attributes, a simulation model of the flexible load corresponding to each flexible load is constructed.

[0011] Based on the equipment keywords of the physical load model to which each flexible load belongs, establish the correspondence between the physical load model and the flexible load simulation model;

[0012] The flexible load attributes include: adjustable capacity, adjustable capacity, and response speed.

[0013] Preferably, the aggregation of flexible loads with active power control capability in the power grid based on a pre-built flexible load simulation model to obtain equivalent generator sets for flexible loads includes:

[0014] The attributes of all flexible loads with power control capabilities are statistically analyzed to obtain the total load capacity, total adjustable capacity, total adjustable capacity, and response speed.

[0015] Add a flexible load equivalent generator set record to the AGC unit table. The unit type is set to AGC controlled unit, the rated capacity corresponds to the total load capacity, the upper and lower limit capacities correspond to the total adjustable capacity and the total adjustable capacity, and the adjustment rate corresponds to the response speed.

[0016] Record the equipment keywords of the equivalent generator set of flexible load in the physical load model, and establish the correspondence between the physical load model and the equivalent generator set of flexible load.

[0017] Preferably, when the simulated power grid system experiences a disturbance, the AGC performs power regulation to distribute power among all generating units in the power grid, including:

[0018] The power grid system is simulated to experience disturbances, and power flow and frequency calculations are performed to obtain the results.

[0019] Based on the calculation results, the current tie-line planned value and measured value, and the system frequency deviation value, the AGC performs real-time ACE calculation. When the ACE deviation exceeds the threshold value, the power is allocated to all AGC units in the network.

[0020] Preferably, after power allocation to all AGC units in the network, the method further includes:

[0021] For thermal power generating units, modify the target power of the corresponding generating units in the power grid model.

[0022] Preferably, the flexible load equivalent generator set performs power control on each flexible load based on the allocated power, including:

[0023] Statistics on all flexible loads associated with generator sets equivalent to flexible loads;

[0024] The total regulation corresponding to the equivalent generator set of the flexible load is allocated to all associated flexible loads;

[0025] Active response simulations were performed for each flexible load, and the adjustment target value was reached over multiple simulation cycles.

[0026] Preferably, the step of allocating the total regulation corresponding to the equivalent generator set of the flexible load to all associated flexible loads includes:

[0027] The total responsiveness of the equivalent generator set for the flexible load is determined according to the correspondence between the equivalent generator set and the flexible load.

[0028] If the total responsiveness of the equivalent generator set of the flexible load is less than the total regulation, then each flexible load will be adjusted to the limit.

[0029] Otherwise, sort the loads according to their response characteristics, allocate the total regulation to each load, and write the regulation target value into the power value domain of the corresponding real-time library.

[0030] The response characteristics include the response cost and response speed of the flexible load.

[0031] Preferably, the step of performing active response simulation for each flexible load and achieving the adjustment target value within multiple simulation cycles includes:

[0032] The amount of power that needs to be adjusted at the current simulation step size is calculated based on the target value.

[0033] The current power is superimposed with the adjustment amount to obtain the output power of the current simulation cycle. At the same time, it is determined whether the output power has reached the adjustment target value. If the target value has been fully adjusted, the adjustment flag of the flexible load is set to 0. Otherwise, the active response simulation continues in the next simulation cycle.

[0034] After all flexible loads have completed one round of simulation, check the load adjustment flag bit of each flexible load. If all are 0, set the load adjustment flag bit of the equivalent generator to 0, write the active power value of the equivalent generator, and the adjustment ends. If there are still flexible loads with load adjustment flag bits of 1, calculate the remaining adjustment power and continue to distribute it to the flexible loads with adjustment flag bits of 1.

[0035] Preferably, the establishment of the flexible load equivalent generator set includes:

[0036] The flexible load of the power grid is equivalent to a generator set, or according to regional characteristics, the flexible load of a region is equivalent to a generator set, and the power grid contains multiple flexible load equivalent generator sets.

[0037] Based on the same inventive concept, this invention also provides a simulation system for flexible loads participating in automatic active power control of the power grid, comprising:

[0038] The power grid simulation platform is used to aggregate flexible loads with active power control capabilities in the power grid based on a pre-built flexible load simulation model to obtain equivalent generator sets for the flexible loads; it is also used to simulate disturbances in the power grid system.

[0039] The control system is used for power regulation by AGC to distribute power to all units in the power grid;

[0040] The flexible load equivalent generator set is used to perform power control on each of its respective flexible loads based on the allocated power.

[0041] Preferably, the power grid simulation platform includes: a construction module for constructing a flexible load simulation model;

[0042] The building module includes:

[0043] The decomposition unit is used to decompose the physical load model in the power grid system to obtain flexible loads with active power control capabilities.

[0044] The construction unit is used to construct a flexible load simulation model corresponding to each flexible load based on each flexible load and the attributes of the flexible load;

[0045] The association unit is used to establish the correspondence between the physical load model and the flexible load simulation model based on the equipment keywords of the physical load model to which each flexible load belongs;

[0046] The flexible load attributes include: adjustable capacity, adjustable capacity, and response speed.

[0047] Preferably, the power grid simulation platform further includes:

[0048] The statistics module is used to statistically analyze the attributes of all flexible loads with power control capabilities, and obtain the total load capacity, total adjustable capacity, total adjustable capacity, and response speed after statistics.

[0049] Add a module to add a flexible load equivalent generator set record to the AGC unit table. The unit type is set to AGC controlled unit, the rated capacity corresponds to the total load capacity, the upper and lower limit capacities correspond to the total adjustable capacity and the total adjustable capacity respectively, and the adjustment rate corresponds to the response speed.

[0050] The module for associating flexible load equivalent generator sets is used to record the equipment keywords of flexible load equivalent generator sets in the physical load model and establish the correspondence between the physical load model and the flexible load equivalent generator sets.

[0051] Preferably, the power grid simulation platform further includes:

[0052] The disturbance simulation module is used to simulate disturbances in the power grid system, perform power flow and frequency calculations, and obtain the calculation results.

[0053] The control system includes:

[0054] The allocation module is used by AGC to perform real-time ACE calculation based on the calculation results, the current tie line planned value and measured value, and the system frequency deviation value. When the ACE deviation exceeds the threshold value, the module allocates power to all AGC units in the network and sends control commands to the power grid simulation platform.

[0055] Preferably, the power grid simulation platform further includes:

[0056] The thermal power generator control module is used to modify the target power of the corresponding generator in the power grid model based on the adjusted power of the thermal power generator in the control command.

[0057] The flexible load equivalent generator set control module is used to optimize and sort the total adjustment amount of the flexible load equivalent generator set based on the response characteristics and constraints of the flexible load in the control command, and to assign adjustment target values ​​to each flexible load.

[0058] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0059] The technical solution provided by this invention aggregates flexible loads with active power control capabilities in the power grid based on a pre-constructed flexible load simulation model, obtaining equivalent generator sets for the flexible loads. It simulates disturbances in the power grid system, with AGC (Automatic Generation Control) performing power regulation and allocating power to all generator sets in the grid. The equivalent generator sets for the flexible loads then perform power control on each of their assigned flexible loads based on the allocated power. By having the equivalent generator sets for the flexible loads participate in AGC power regulation, and utilizing the flexible load simulation model and the equivalent generator sets, the flexible loads actively participate in the simulation, thereby achieving the goal of flexible loads participating in active power control of the power grid. This enables effective analysis of the impact of flexible loads participating in active power control on the power grid operation.

[0060] The technical solution provided by this invention breaks through the limitations of traditional power grid simulation systems in load active power control simulation, expands and establishes a detailed flexible load simulation model, performs detailed simulation of the active power response characteristics of flexible loads, and effectively analyzes the ability of flexible loads in the power grid to participate in active power control.

[0061] The technical solution provided by this invention establishes a method for aggregation and equivalence of flexible load characteristics, which statistically aggregates the complex and diverse response characteristics of flexible loads and equivalences them into a controllable generator set, which participates in AGC control together with conventional thermal power units.

[0062] This invention provides a customizable aggregation range for equivalent generator sets. It can equate flexible loads in the power grid to a single generator set, or it can equate each region to a single generator set based on regional attributes, thus meeting the needs for different simulation granularities. Attached Figure Description

[0063] Figure 1 A flowchart of a simulation method for automatic active power control of flexible loads provided by the present invention;

[0064] Figure 2 A simulation system framework diagram for flexible load active power automatic control provided by the present invention;

[0065] Figure 3 This is a flowchart illustrating the flexible load distribution process in an embodiment of the present invention.

[0066] Figure 4 A flowchart illustrating the active response to flexible loads provided in an embodiment of the present invention. Detailed Implementation

[0067] To better understand this invention, the following description, in conjunction with the accompanying drawings and examples, will further illustrate the invention.

[0068] Example 1

[0069] This invention extends the load model based on the existing power grid simulation system, establishes a detailed flexible load simulation model, decomposes the flexible load into controllable flexible loads and conventional loads, aggregates them according to the load response characteristics, and aggregates controllable loads into equivalent generating units to participate in the power grid interactive control simulation, thereby realizing the simulation analysis of the control characteristics of flexible loads.

[0070] like Figure 1 As shown, the present invention provides a simulation method for flexible load participation in automatic active power control of the power grid, comprising:

[0071] S1 aggregates flexible loads with active power control capability in the power grid based on a pre-built flexible load simulation model to obtain the equivalent generator set of the flexible load.

[0072] S2 simulates a disturbance in the power grid system, and AGC performs power regulation to distribute power to all units in the power grid;

[0073] The S3 flexible load equivalent generator set performs power control on each of its flexible loads based on the allocated power.

[0074] based on Figure 2 The present invention provides a specific description of a simulation method for flexible loads participating in automatic active power control of a power grid, comprising the following steps:

[0075] Step 1: Decompose the physical load model in the current power grid simulation platform, establish a flexible load simulation model according to typical classifications, and maintain the correspondence between the flexible load simulation model and the physical load model.

[0076] Step 2: Aggregate the characteristics of flexible loads with master control capabilities in the power grid simulation platform, and equate the aggregated response characteristics to a generator set for AGC control, while maintaining the correspondence between flexible loads and equivalent generator sets;

[0077] Step 3: The power grid simulation platform sets system disturbances, the control system performs AGC simulation calculations, and sends the control strategies of conventional generators and equivalent generator sets of flexible loads to the power grid simulation platform for execution;

[0078] Step 4: The flexible load simulation receives control commands from the equivalent generator unit, controls its corresponding flexible loads according to their response capabilities, and returns the control results to the power grid simulation platform.

[0079] This invention discloses three key technical problems and proposes corresponding technical measures.

[0080] I. Automatic Modeling and Aggregated Equivalent Technology for Flexible Loads

[0081] Traditional power grid simulation systems typically lack detailed low-voltage load models, instead treating the main transformer as an equivalent load. For example, in a provincial power grid simulation system, the high-voltage side of the 220kV main transformer is usually considered as the equivalent load. This invention decomposes and refines the equivalent load of the main transformer based on typical flexible load types, resulting in three types of flexible loads with different response attributes. The characteristics of these three types of flexible loads are shown in Table 1. The proportion and response characteristics of these three types of flexible loads can be modified according to actual conditions.

[0082] Table 1 Types and characteristics of flexible loads

[0083]

[0084] This invention establishes three typical flexible load types, corresponding to three different simulation modes: planned tracking, active response, and third-party simulation. The proportions of the three types can be adjusted to analyze the response capabilities of flexible loads of different scales and response capabilities to power grid disturbances.

[0085] The flexible loads involved in this invention are mainly active response loads. Typical parameter attributes of this type of load are shown in Table 2. The parameter attributes of each flexible load can be adjusted according to the actual situation.

[0086] Table 2 Typical parameters of active response loads

[0087]

[0088] The typical attributes of all active response flexible loads are aggregated and mapped to the typical control characteristics of AGC-controlled units. The main attributes and their corresponding relationships are shown in Table 3.

[0089] Table 3. Correspondence between typical control characteristics of AGC-controlled units

[0090]

[0091]

[0092] In the AGC module of the control system, add model information for a flexible load equivalent unit. The corresponding key attributes are statistically analyzed according to the aggregation principle. The power station to which the equivalent unit belongs can be set as a virtual power station. Add the corresponding PLC model to the PLC table of the AGC and associate it with the equivalent unit.

[0093] Meanwhile, a corresponding active power control model is added to the power grid simulation platform. This model is mainly used to receive the equivalent generator control commands sent by AGC and send them to the flexible load simulation for active response.

[0094] II. Power Grid Interaction Simulation Technology Considering Active Response of Flexible Loads

[0095] The power grid interactive simulation system mainly consists of two parts: a power grid simulation platform and a control system. The power grid simulation platform performs steady-state power flow and frequency calculations based on the established power grid model and operating mode, and sends the simulation results to the control system. The control system performs AGC simulation calculations based on the received simulation data to obtain the control strategy for each generator unit, and sends control commands to the power grid simulation platform for generator power control. The simulation results in this invention represent the power grid operating data after a disturbance occurs.

[0096] Traditional power grid simulation systems only perform active power control on thermal power units. This invention, after considering the active power control of flexible loads, integrates the equivalent units of flexible loads with conventional thermal power units into AGC closed-loop control.

[0097] During the simulation, the flexible load performs power tracking according to the set load plan curve. At the same time, the key attributes of all flexible loads are aggregated and statistically analyzed to update the active power, adjustable capacity and other attributes of the equivalent unit of the flexible load.

[0098] After a disturbance occurs in the simulated power grid system, the power grid simulation platform performs power flow and frequency calculations, and sends the results to the control system. The control system's AGC module performs real-time ACE calculations based on the current tie-line planned and measured values ​​and the system frequency deviation. When the ACE deviation exceeds a threshold, power allocation and closed-loop control are implemented for all AGC units across the network. For conventional units, the AGC's regulation commands are directly fed back to the power grid simulation platform for generator regulation. For equivalent generator units of flexible loads, the response characteristics and constraints of the flexible loads are optimized and ranked, and a response target value is allocated to each flexible load. Each flexible load actively responds according to its own response rate and returns the response result to the power grid simulation platform.

[0099] III. Active Power Control Technology for Flexible Load Active Response

[0100] After receiving the control command sent by the AGC of the control system, the power grid simulation platform directly modifies the target power of the corresponding generator unit in the power grid model for conventional thermal power units, and adopts flexible load active power control technology for flexible load equivalent units.

[0101] First, all flexible load information corresponding to the equivalent generating units of flexible loads is statistically analyzed, including individual and overall adjustable capacity, upper and lower limits of load power, etc. Active response power allocation technology is then used to distribute the total response power to each specific flexible sub-load. Flexible load simulation employs active response simulation technology to perform active response simulation for each individual sub-load, tracking the control target power and achieving the control power target value within multiple simulation cycles. Simultaneously, the response results are returned to the power grid simulation platform for processing.

[0102] (1) Active response power allocation technology

[0103] When an adjustment command is received, the total adjustable capacity of the equivalent unit of the flexible load is first determined according to the correspondence between the equivalent unit and the flexible load.

[0104] If the total adjustable capacity is insufficient, adjust each flexible load directly to its limit.

[0105] If the total adjustable capacity is sufficient, the loads are sorted according to their response characteristics, which mainly include the response cost and response speed of the loads. The total adjustable capacity is allocated to each load according to the rule of prioritizing response speed or cost, and the target value is written into the power target value domain of the corresponding real-time library.

[0106] Figure 3 As shown, the flexible load sharing process includes:

[0107] Receive power adjustment commands;

[0108] Select all loads with active response type from the flexible load model;

[0109] The total adjustable capacity of the current system's flexible load needs to be adjusted upwards.

[0110] When the upward adjustment capacity is sufficient, the adjustment ratio of each flexible load is calculated, the adjustment amount of the flexible load is calculated based on the adjustment ratio, the power adjustment amount of the flexible load is written, and the power allocation ends.

[0111] Otherwise, all flexible loads are set to the upper limit, the power adjustment amount of the flexible loads is written, and the power allocation ends;

[0112] Execution needs to be reduced:

[0113] If the current adjustment capacity is sufficient, calculate the adjustment ratio of each flexible load, calculate the adjustment amount of the flexible load based on the adjustment ratio, write the power adjustment amount of the flexible load, and the power allocation ends.

[0114] Otherwise, all flexible loads are set to the lower limit, the power adjustment amount of the flexible loads is written, and the power distribution ends.

[0115] (2) Flexible load active response simulation technology

[0116] The active response flexible load includes a load adjustment flag. In each simulation cycle, this flag is used to determine whether the system is in planned tracking or active response mode. If the load adjustment flag is set to 1, the adjustment step size for the current simulation cycle is calculated based on the current output power and the allocated target power, taking into account the predefined response capability, thus obtaining the output power. Simultaneously, upper and lower adjustment limits are considered. If the obtained output power exceeds the subload's power upper and lower limits, the output power is fixed at those limits, and the load adjustment flag is set to 0. Active response simulation will not be performed again in the next simulation cycle.

[0117] like Figure 4 As shown, the power adjustment required for the current simulation step size is calculated according to the above principles. The current power is then added to the adjustment amount to obtain the output power for the current simulation cycle. Simultaneously, it is determined whether the output power has reached the adjustment target value. If the adjustment target value has been fully reached, the adjustment flag of the sub-load is set to 0. If the adjustment target value has not yet been reached, the active response simulation continues in the next simulation cycle.

[0118] After all flexible loads have completed one round of simulation, determine whether the adjustment flags of all flexible loads in the system are all 0. If they are all 0, it means that the whole system has completed the active response. Set the system adjustment flags to 0 and proceed to the next round of unbalanced power response.

[0119] Specifically, step 1 includes:

[0120] 1-1. Search all physical load models in the power grid simulation system, and automatically generate three flexible load records for each physical load model, corresponding to the planned tracking type, active response type and third-party simulation type respectively. The proportion of the three types of flexible loads is automatically set according to the pre-determined typical proportion.

[0121] 1-2. Set key attributes for each automatically generated flexible load record, including adjustable capacity, adjustable capacity, and response speed, and record the equipment keywords of the physical model to which it belongs, so as to establish the subordinate relationship between physical load and flexible load.

[0122] Furthermore, the flexible load model record is automatically generated based on the physical load model in the current power grid simulation system, and the typical characteristics of the flexible load model can be modified according to the actual situation, including the proportion of the physical load occupied by the flexible load type, the adjustable capacity, the adjustable capacity, and the response speed.

[0123] Specifically, step 2 includes:

[0124] 2-1. Statistically analyze the active response flexible loads of the entire network, extract the static characteristics of the loads, and obtain the total load capacity, total adjustable capacity, total adjustable capacity, response speed, etc. after the statistics.

[0125] 2-2. Add a flexible load equivalent unit record to the AGC unit table of the control system. Set the unit type to AGC controlled unit, the rated capacity to the total load capacity, the upper and lower limit capacity to the total adjustable capacity, and the adjustment rate to the response speed.

[0126] 2-3. Record the equipment keywords of the equivalent units of flexible loads in the physical model of the simulation system, establish the correspondence between the physical model and the aggregated equivalent units, so as to allocate the active power control target of the equivalent units to the physical loads to which they belong.

[0127] The number of equivalent generating units in this invention is variable. The flexible load of the entire network can be equivalent to one generator, or the flexible load of a region can be equivalent to one generating unit according to regional characteristics. The entire network contains multiple equivalent generating units for flexible loads.

[0128] Specifically, step 3 includes:

[0129] 3-1. Flexible load equivalent units participate in AGC active power control together with conventional thermal power units. AGC allocates the target power of each unit according to the power deviation and sends the target value to the power grid simulation platform.

[0130] 3-2. The power grid simulation platform processes the two types of generating units separately. For conventional generating units, the corresponding generator is found directly in the database based on the equipment keywords, and the active power of the generator is modified. For the equivalent generator of flexible loads, all associated flexible loads are searched based on the equivalent generator equipment keywords, and the load adjustment flag of the equivalent generator is set to 1, and the target power allocation and response are performed.

[0131] Specifically, step 4 includes:

[0132] 4-1. Set the load adjustment flag of each flexible load to 1, indicating that the current flexible load is in the process of active power response; sort according to response speed and consider the upper and lower limits of adjustment of each load, and allocate the power adjustment amount to each flexible load;

[0133] 4-2. Each flexible load independently performs active power response. If the flexible load can fully respond to the adjustment amount, the load adjustment flag of the flexible load is set to 0, indicating the end of the response.

[0134] 4-3. After all flexible load simulations are completed, check the adjustment flag of each flexible load. If all are 0, it means that the power adjustment is complete. Set the load adjustment flag of the equivalent generator to 0, write the active power value of the equivalent generator, and the adjustment ends. If there are still flexible loads with load adjustment flags of 1, it means that the power has not been adjusted to the required level. Calculate the remaining adjustment power and continue to distribute it to the flexible loads with adjustment flags of 1.

[0135] The flexible load response in this invention requires multiple rounds of adjustment to gradually approach the target power value; each flexible load has an independent adjustment flag to indicate whether the power response has been completed.

[0136] Example 2

[0137] Based on the same inventive concept, this invention also provides a simulation system for flexible load participation in automatic active power control of the power grid, comprising:

[0138] The power grid simulation platform is used to aggregate flexible loads with active power control capabilities in the power grid based on a pre-built flexible load simulation model to obtain equivalent generator sets for the flexible loads; it is also used to simulate disturbances in the power grid system.

[0139] The control system is used for power regulation by AGC to distribute power to all units in the power grid;

[0140] The flexible load equivalent generator set is used to perform power control on each of its respective flexible loads based on the allocated power.

[0141] In this embodiment, the power grid simulation platform includes: a construction module for constructing a flexible load simulation model;

[0142] The building module includes:

[0143] The decomposition unit is used to decompose the physical load model in the power grid system to obtain flexible loads with active power control capabilities.

[0144] The construction unit is used to construct a flexible load simulation model corresponding to each flexible load based on each flexible load and the attributes of the flexible load;

[0145] The association unit is used to establish the correspondence between the physical load model and the flexible load simulation model based on the equipment keywords of the physical load model to which each flexible load belongs;

[0146] The flexible load attributes include: adjustable capacity, adjustable capacity, and response speed; the correspondence between the physical load model and the flexible load simulation model is reflected by equipment keywords.

[0147] In this embodiment, the power grid simulation platform further includes:

[0148] The statistics module is used to statistically analyze the attributes of all flexible loads with power control capabilities, and obtain the total load capacity, total adjustable capacity, total adjustable capacity, and response speed after statistics.

[0149] Add a module to add a flexible load equivalent generator set record to the AGC unit table. The unit type is set to AGC controlled unit, the rated capacity corresponds to the total load capacity, the upper and lower limit capacities correspond to the total adjustable capacity and the total adjustable capacity respectively, and the adjustment rate corresponds to the response speed.

[0150] The module for associating flexible load equivalent generator sets is used to record the equipment keywords of flexible load equivalent generator sets in the physical load model and establish the correspondence between the physical load model and the flexible load equivalent generator sets.

[0151] In this embodiment, the power grid simulation platform further includes:

[0152] The disturbance simulation module is used to simulate disturbances in the power grid system, perform power flow and frequency calculations, and obtain the calculation results.

[0153] The control system includes:

[0154] The allocation module is used by AGC to perform real-time ACE calculation based on the calculation results, the current tie line planned value and measured value, and the system frequency deviation value. When the ACE deviation exceeds the threshold value, the module allocates power to all AGC units in the network and sends control commands to the power grid simulation platform.

[0155] In this embodiment, the power grid simulation platform further includes:

[0156] The thermal power generator control module is used to modify the target power of the corresponding generator in the power grid model based on the adjusted power of the thermal power generator in the control command.

[0157] The flexible load equivalent generator set control module is used to optimize and sort the total adjustment amount of the flexible load equivalent generator set based on the response characteristics and constraints of the flexible load in the control command, and to assign adjustment target values ​​to each flexible load.

[0158] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0159] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0160] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0161] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0162] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A simulation method for flexible loads participating in automatic active power control of a power grid, characterized in that, include: Based on a pre-built flexible load simulation model, flexible loads with active power control capability of the power grid are aggregated to obtain equivalent generator sets for flexible loads. When a disturbance occurs in the simulated power grid system, the AGC (Automatic Generator Control) performs power regulation to distribute power to all units in the power grid. The equivalent generator set for the flexible load performs power control on each of its respective flexible loads based on the allocated power. The construction of the flexible load simulation model includes: The physical load model in the power grid system is decomposed to obtain flexible loads with active power control capabilities; Based on each flexible load and its attributes, a simulation model of the flexible load corresponding to each flexible load is constructed. Based on the equipment keywords of the physical load model to which each flexible load belongs, establish the correspondence between the physical load model and the flexible load simulation model; The flexible load attributes include: adjustable capacity, adjustable capacity, and response speed; the aggregation of flexible loads with active power control capability in the power grid based on a pre-built flexible load simulation model to obtain equivalent generator sets for flexible loads includes: The attributes of all flexible loads with active power control capabilities are statistically analyzed to obtain the total load capacity, total adjustable capacity, total adjustable capacity, and response speed. Add a flexible load equivalent generator set record to the AGC unit table. The unit type is set to AGC controlled unit, the rated capacity corresponds to the total load capacity, the upper and lower limit capacities correspond to the total adjustable capacity and the total adjustable capacity, and the adjustment rate corresponds to the response speed. Record the equipment keywords of the equivalent generator set for flexible loads in the physical load model to establish the correspondence between the physical load model and the equivalent generator set for flexible loads; the equivalent generator set for flexible loads performs power control on each of its assigned flexible loads based on the allocated power, including: Statistics on all flexible loads associated with generator sets equivalent to flexible loads; The total regulation corresponding to the equivalent generator set of the flexible load is allocated to all associated flexible loads; Active response simulations were performed for each flexible load, and the target adjustment value was achieved over multiple simulation cycles. The step of allocating the total regulation corresponding to the equivalent generator set of the flexible load to all associated flexible loads includes: The total responsiveness of the equivalent generator set for the flexible load is determined according to the correspondence between the equivalent generator set and the flexible load. If the total responsiveness of the equivalent generator set of the flexible load is less than the total regulation, then each flexible load will be adjusted to the limit. Otherwise, sort the loads according to their response characteristics, allocate the total regulation to each load, and write the regulation target value into the power value domain of the corresponding real-time library. The response characteristics include the response cost and response speed of the flexible load.

2. The method according to claim 1, characterized in that, When the simulated power grid system experiences a disturbance, the AGC (Automatic Generation Control) performs power regulation, allocating power to all generating units in the grid, including: The power grid system is simulated to experience disturbances, and power flow and frequency calculations are performed to obtain the results. Based on the calculation results, the current tie-line planned value and measured value, and the system frequency deviation value, the AGC performs real-time ACE calculation. When the ACE deviation exceeds the threshold value, the power is allocated to all AGC units in the network.

3. The method according to claim 2, characterized in that, After the power allocation of all AGC units in the network, the following is also included: For thermal power generating units, modify the target power of the corresponding generating units in the power grid model.

4. The method according to claim 1, characterized in that, The active response simulation for each flexible load, and the achievement of the adjustment target value within multiple simulation cycles, includes: The amount of power that needs to be adjusted at the current simulation step size is calculated based on the target value. The output power of the current simulation cycle is obtained by superimposing the current power with the power that needs to be adjusted. At the same time, it is determined whether the output power has reached the adjustment target value. If the adjustment target value has been fully reached, the adjustment flag of the flexible load is set to 0. Otherwise, the active response simulation continues in the next simulation cycle. After all flexible loads have completed one round of simulation, check the load adjustment flag bit of each flexible load. If all are 0, set the load adjustment flag bit of the equivalent generator to 0, write the active power value of the equivalent generator, and the adjustment ends. If there are still flexible loads with load adjustment flag bits of 1, calculate the remaining adjustment power and continue to distribute it to the flexible loads with adjustment flag bits of 1.

5. The method according to claim 1, characterized in that, The establishment of the flexible load equivalent generator set includes: Based on regional characteristics, the flexible load of a region is equivalent to a generator set, the power grid contains multiple generator sets equivalent to flexible loads, or the flexible load of the power grid is equivalent to a generator set.

6. A simulation system for flexible loads participating in automatic active power control of a power grid, characterized in that, include: The power grid simulation platform is used to aggregate flexible loads with active power control capabilities in the power grid based on a pre-built flexible load simulation model to obtain the equivalent generator set of the flexible load. It is also used to simulate disturbances in the power grid system; The control system is used for power regulation by AGC to distribute power to all units in the power grid; The equivalent generator set for the flexible load performs power control on each of its respective flexible loads based on the allocated power. The power grid simulation platform includes: a construction module for constructing a flexible load simulation model; The building module includes: The decomposition unit is used to decompose the physical load model in the power grid system to obtain flexible loads with active power control capability; the construction unit is used to construct the flexible load simulation model corresponding to each flexible load based on each flexible load and the attributes of the flexible load. The association unit is used to establish the correspondence between the physical load model and the flexible load simulation model based on the equipment keywords of the physical load model to which each flexible load belongs; The flexible load attributes include: adjustable capacity, adjustable capacity, and response speed; the power grid simulation platform also includes: The statistics module is used to perform statistics on the attributes of all flexible loads with active power control capabilities, and obtain the total load capacity, total adjustable capacity, total adjustable capacity and response speed after statistics. Add a module to add a flexible load equivalent generator set record to the AGC unit table. The unit type is set to AGC controlled unit, the rated capacity corresponds to the total load capacity, the upper and lower limit capacities correspond to the total adjustable capacity and the total adjustable capacity respectively, and the adjustment rate corresponds to the response speed. The association module for the equivalent generator set of flexible load is used to record the equipment keywords of the equivalent generator set of flexible load in the physical load model and establish the correspondence between the physical load model and the equivalent generator set of flexible load. The power grid simulation platform also includes: The flexible load equivalent generator set control module is used to optimize and sort the total adjustment amount of the flexible load equivalent generator set based on the control command, according to the response characteristics and constraints of the flexible load, and assign adjustment target value to each flexible load. The equivalent generator set for the flexible load performs power control on each of its respective flexible loads based on the allocated power, including: Statistics on all flexible loads associated with generator sets equivalent to flexible loads; The total regulation corresponding to the equivalent generator set of the flexible load is allocated to all associated flexible loads; Active response simulations were performed for each flexible load, and the target adjustment value was achieved over multiple simulation cycles. The step of allocating the total regulation corresponding to the equivalent generator set of the flexible load to all associated flexible loads includes: The total responsiveness of the equivalent generator set for the flexible load is determined according to the correspondence between the equivalent generator set and the flexible load. If the total responsiveness of the equivalent generator set of the flexible load is less than the total regulation, then each flexible load will be adjusted to the limit. Otherwise, sort the loads according to their response characteristics, allocate the total regulation to each load, and write the regulation target value into the power value domain of the corresponding real-time library. The response characteristics include the response cost and response speed of the flexible load.

7. The system as described in claim 6, characterized in that, The power grid simulation platform also includes: The disturbance simulation module is used to simulate disturbances in the power grid system, perform power flow and frequency calculations, and obtain the calculation results. The control system includes: The allocation module is used by AGC to perform real-time ACE calculation based on the calculation results, the current tie line planned value and measured value, and the system frequency deviation value. When the ACE deviation exceeds the threshold value, the module allocates power to all AGC units in the network and sends control commands to the power grid simulation platform.

8. The system as described in claim 7, characterized in that, The power grid simulation platform also includes: The thermal power generator control module is used to modify the target power of the corresponding generator in the power grid model based on the power adjustment of the thermal power generator in the control command.

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