A dynamic intelligent control method and system for low-frequency load shedding scheme of regional power grid

Abstract

The present invention discloses a method and system for dynamic intelligent control of a low-frequency load shedding scheme for a regional power grid, establishes a low-frequency load shedding function model for a regional power grid, performs online monitoring and automatic analysis of the low-frequency load shedding function, realizes dynamic adjustment and auxiliary decision-making of the low-frequency load shedding scheme, real-time distribution and execution of the adjustment scheme, and online analysis of the adjustment effect, which enables the low-frequency load shedding scheme to adapt to changes in the load of the power grid, and ensures the rationality of the low-frequency load shedding scheme and the timeliness of the scheme adjustment. By using the auxiliary decision-making function for adjusting the low-frequency load shedding scheme, the adjustment scheme can be intelligently generated, thereby reducing a large amount of manual compilation workload, while ensuring the correctness of the dynamic adjustment of the low-frequency load shedding scheme; by using the remote on / off control function of the pressure plate of the feeder low-frequency load shedding function, the distribution and execution of the adjustment scheme can be automatically completed, thereby reducing a large amount of manual pressure plate on / off operations.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid control, and in particular to a dynamic intelligent control method and system for a low-frequency load reduction scheme of a regional power grid. Background Art

[0002] In order to ensure the safe and stable operation of the regional power grid, it is required that the power grid's all-weather low-frequency load reduction operation should dynamically maintain the load shedding capacity between 100% and 105% of the required load shedding capacity, so as to avoid over- or under-load shedding caused by the low-frequency load shedding protection action after a frequency event in the power grid, affecting the stability of the power grid operation.

[0003] At present, there are the following problems in the management of low-frequency load shedding in regional power grids:

[0004] 1. The preparation of low-frequency load shedding schemes must comprehensively consider factors such as the nature, characteristics and load level of feeder loads. At present, the preparation of low-frequency load shedding schemes based on manual experience has problems such as large workload, low efficiency and unreasonable load shedding schemes caused by human factors. The manually prepared low-frequency load shedding schemes are based on limited historical operating sections of the power grid. However, the operating status of the power grid and the feeder loads are changing in real time. Therefore, the formulated low-frequency load shedding schemes are difficult to meet the load shedding requirements of the power grid at all times of the day.

[0005] 2. Traditional load shedding adjustment measures mainly rely on manual formulation of load shedding adjustment plans, which are then issued to the county and distribution center (i.e., county-level power grid dispatching center and distribution network dispatching center) and then transferred to on-site operations. The adjustment of load shedding has problems such as long execution cycle and adjustment lag, and it is impossible to track the changes in power grid load and make real-time adjustments.

[0006] 3. In order to avoid the low-frequency load reduction protection from mistakenly cutting off the distributed power supply, the traditional practice is to exclude the distributed power supply access feeders that had reverse power flow in the previous year during the annual plan preparation process. However, in the year when the plan was implemented, some feeders were newly connected to distributed power supplies, or the distributed power supplies connected to some feeders were reconnected to other feeders, resulting in some feeders being converted from passive feeders to active feeders. At present, it is impossible to timely adjust the low-frequency load reduction function according to the changes in the feeder power flow direction.

[0007] 4. During holidays and major power supply protection periods, the low-frequency load shedding function of a large number of power supply feeders must be shut down. The traditional approach is to adjust the low-frequency load shedding plan according to the power supply protection plan, shut down the low-frequency load shedding function of the relevant power supply feeders, and adjust the low-frequency load shedding function of other feeders to make up for the insufficient load shedding completion rate. This involves risks such as large adjustment workload and missed execution.

[0008] The invention patent with application number 201710138449.8 relates to a classified low-voltage load reduction method and system based on load characteristics, including the following steps: analyzing the dynamic response characteristics of the load to obtain the QV relationship characteristic curve of the load reactive power changing with the voltage; taking the dynamic motor load as the basic load, formulating the initial low-voltage load reduction plan according to the current method; determining the replacement coefficient of the load under different voltage levels with reference to the QV relationship characteristic curve; based on the replacement coefficient, proposing a method of configuring classified low-voltage load reduction measures to cut off various types of loads; verifying and determining the final classified low-voltage load reduction plan through simulation calculation.

[0009] Based on the research content required by the traditional low-voltage load shedding method, the technical solution of this invention proposes that it is also necessary to study the impact of different load characteristics on the low-voltage load shedding scheme and the replacement and coordination of various load shedding amounts. On this basis, a configuration method and steps for classified low-voltage load shedding measures based on load characteristics are proposed. It is necessary to compile a low-frequency load shedding scheme based on manual experience, which has problems such as large workload, low efficiency, and unreasonable load shedding schemes caused by human factors.

[0010] The invention patent with application number 202110924308.5 discloses a low-frequency load reduction method with pre-centralized coordination and real-time distributed control, including: predicting the future T of the load line f The load forecast value at the moment; search for load-shedding lines at intervals until the searched load-shedding lines have the following future T f When the sum of the load forecast values ​​at each moment reaches the low-frequency demand cut, the search is stopped and the future T f The load shedding line at the moment; the future T f The load shedding line information at the moment is converted into the low-frequency trip output setting value and sent to the device for it to f When a low-frequency fault occurs, the corresponding load line is cut off according to the low-frequency tripping output fixed value action in combination with the local error prevention strategy. The technical solution described in this invention relies on the accurate prediction of the feeder load at the future moment. In the specific implementation, it is difficult to ensure that the error between the predicted load level and the actual load level meets the requirements. When the error cannot meet the requirements, there is still the problem of being unable to track the changes in the power grid load and adjust the low-frequency load reduction plan in time. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide a dynamic intelligent control method and system for a low-frequency load shedding scheme of a regional power grid, which can realize dynamic control of the low-frequency load shedding scheme of the regional power grid, and ensure the correctness and rationality of the preparation of the low-frequency load shedding scheme of the regional power grid and the timeliness of the scheme adjustment.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0013] A dynamic intelligent control method for a regional power grid low-frequency load reduction scheme comprises the following steps:

[0014] Step 1: Establish a low-frequency load shedding function model for a regional power grid, wherein the low-frequency load shedding function model for a regional power grid includes: a low-frequency load shedding round table model, a low-frequency load shedding round item model, a low-frequency load shedding device model, and a feeder load model;

[0015] Step 2: monitor the low-frequency load shedding function of the regional power grid, determine whether the functions of each round of low-frequency load shedding of the regional power grid are normal, calculate the load shedding amount and operation completion rate of each low-frequency load shedding round, and determine whether the operation completion rate of each low-frequency load shedding round meets the preset requirements;

[0016] Step 3: Initialize the dynamic adjustment resource pool of the low-frequency load reduction solution;

[0017] Step 4: When it is determined that there is a low-frequency load shedding round whose operation completion rate does not meet the preset requirements, an auxiliary decision is made on the low-frequency load shedding plan, a low-frequency load shedding dynamic adjustment plan is generated, and a set of adjustment round items is obtained;

[0018] Step 5: Based on the regional power grid low-frequency load reduction function model, the feeder low-frequency load reduction function plate remote switching / retraction control function of the power grid dispatching control system is applied to execute the regional power grid low-frequency load reduction dynamic adjustment plan;

[0019] Step 6: Analyze and display the execution deviation of the low-frequency load shedding adjustment plan of the regional power grid, and divide the adjustment round item set into a round item set in which the low-frequency load shedding function pressure plate is successfully controlled and a round item set in which the low-frequency load shedding function pressure plate fails to control;

[0020] Step 7, modifying the setting state of the round item in the round item set in which the pressure plate is successfully controlled;

[0021] Step 8: assigning values ​​to the adjustment failure counter and the freezing timer of the round items in the adjustment round item set;

[0022] Step 9: Return to step 3 and repeat the dynamic adjustment process of the low-frequency load reduction scheme from steps 3 to 8.

[0023] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0024] A dynamic intelligent management and control system for a low-frequency load shedding scheme for a regional power grid comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, each step of the above-mentioned dynamic intelligent management and control method for a low-frequency load shedding scheme for a regional power grid is implemented.

[0025] The beneficial effects of the present invention are: establishing a regional power grid low-frequency load shedding function model, conducting online operation monitoring and automatic analysis of the low-frequency load shedding function, realizing auxiliary decision-making for dynamic adjustment of the low-frequency load shedding scheme, real-time distribution and execution of the adjustment scheme, and online analysis of the adjustment effect, which enables the low-frequency load shedding scheme to adapt to changes in the power grid load, ensuring the rationality of the low-frequency load shedding scheme and the timeliness of the scheme adjustment. By using the auxiliary decision-making function for adjusting the low-frequency load shedding scheme, the adjustment scheme can be intelligently generated, thereby reducing a large amount of manual compilation workload, while ensuring the correctness of the dynamic adjustment of the low-frequency load shedding scheme; by using the remote on / off control function of the feeder low-frequency load shedding function pressure plate, the adjustment scheme can be automatically distributed and executed, thereby reducing a large number of manual pressure plate on / off operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a dynamic intelligent control method of a regional power grid low-frequency load reduction scheme according to an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a dynamic intelligent control system for a regional power grid low-frequency load reduction solution according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0029] Please refer to Figure 1 The embodiment of the present invention provides a dynamic intelligent control method for a regional power grid low-frequency load reduction scheme, comprising the steps of:

[0030] Step 1: Establish a low-frequency load shedding function model for a regional power grid, wherein the low-frequency load shedding function model for a regional power grid includes: a low-frequency load shedding round table model, a low-frequency load shedding round item model, a low-frequency load shedding device model, and a feeder load model;

[0031] Step 2: monitor the low-frequency load shedding function of the regional power grid, determine whether the functions of each round of low-frequency load shedding of the regional power grid are normal, calculate the load shedding amount and operation completion rate of each low-frequency load shedding round, and determine whether the operation completion rate of each low-frequency load shedding round meets the preset requirements;

[0032] Step 3: Initialize the dynamic adjustment resource pool of the low-frequency load reduction solution;

[0033] Step 4: When it is determined that there is a low-frequency load shedding round whose operation completion rate does not meet the preset requirements, an auxiliary decision is made on the low-frequency load shedding plan, a low-frequency load shedding dynamic adjustment plan is generated, and a set of adjustment round items is obtained;

[0034] Step 5: Based on the regional power grid low-frequency load reduction function model, the feeder low-frequency load reduction function plate remote switching / retraction control function of the power grid dispatching control system is applied to execute the regional power grid low-frequency load reduction dynamic adjustment plan;

[0035] Step 6: Analyze and display the execution deviation of the low-frequency load shedding adjustment plan of the regional power grid, and divide the adjustment round item set into a round item set in which the low-frequency load shedding function pressure plate is successfully controlled and a round item set in which the low-frequency load shedding function pressure plate fails to control;

[0036] Step 7, modifying the setting state of the round item in the round item set in which the pressure plate is successfully controlled;

[0037] Step 8: assigning values ​​to the adjustment failure counter and the freezing timer of the round items in the adjustment round item set;

[0038] Step 9: Return to step 3 and repeat the dynamic adjustment process of the low-frequency load reduction scheme from steps 3 to 8.

[0039] From the above description, it can be seen that the beneficial effects of the present invention are: establishing a regional power grid low-frequency load reduction function model, conducting online operation monitoring and automatic analysis of the low-frequency load reduction function, realizing auxiliary decision-making for dynamic adjustment of the low-frequency load reduction plan, real-time distribution and execution of the adjustment plan, and online analysis of the adjustment effect, which can make the low-frequency load reduction plan adapt to the changes in the power grid load, and ensure the rationality of the low-frequency load reduction plan and the timeliness of the plan adjustment. By using the auxiliary decision-making function for adjusting the low-frequency load reduction plan, the adjustment plan can be intelligently generated, thereby reducing a large amount of manual compilation workload, while ensuring the correctness of the dynamic adjustment of the low-frequency load reduction plan; by using the remote on / off control function of the feeder low-frequency load reduction function pressure plate, the adjustment plan can be automatically distributed and executed, thereby reducing a large number of manual pressure plate on / off operations.

[0040] Further, step 3 includes:

[0041] The round items that meet the following four conditions are selected into the dynamic adjustment resource pool of the low-frequency load reduction scheme:

[0042] ① The function of the item in this round is judged to be normal;

[0043] ② The feeder corresponding to the round item does not experience power flow reversal due to the access to distributed power sources;

[0044] ③The feeder load associated with the round item is not "non-interruptible load";

[0045] ④ The value of the continuous adjustment failure counter of the round item does not reach the preset allowable upper limit.

[0046] Furthermore, step 3 also includes:

[0047] If the round item does not meet the above conditions ② or ③, then:

[0048] Check whether the setting status of the round item is "on"; if so, change its setting status to "off";

[0049] Check whether the feeder low-frequency load reduction function pressure plate corresponding to the round item is currently in the "on" state. If so, the pressure plate should be remotely operated on the dispatching control system to exit.

[0050] From the above description, it can be seen that the above initialization of the dynamic adjustment resource pool and the processing of the round items that meet condition ② or condition ③ are all preliminary processing performed before the official start of the dynamic adjustment of the low-frequency load reduction scheme. The purpose includes two aspects: one is to complete the initialization of the dynamic adjustment resource pool to prepare for the selection of adjustable resources when making auxiliary decisions for the dynamic adjustment of the low-frequency load reduction scheme; the other is to complete the processing of the round items that meet condition ② or condition ③ to ensure that their setting status is "exit" and the corresponding feeder low-frequency load reduction protection function pressure plate is in the "exit" state.

[0051] Furthermore, the determination of whether the operation completion rate of each low-frequency load reduction round meets the preset requirements includes:

[0052] If Rate(round(i),DN)·m D ≤Rate(round(i))≤Rate(round(i),UP)·m U , then the operation completion rate of the low-frequency load shedding round meets the requirements, otherwise, the operation completion rate of the low-frequency load shedding round does not meet the requirements.

[0053] In the formula, round(i) represents the low-frequency load shedding round with ID i, Rate(round(i)) represents the operation completion rate of round(i), Rate(round(i),DN) represents the lower limit of the operation completion rate of round(i), and m D Indicates the adjustment margin when the operation completion rate exceeds the lower limit, Rate(round(i),UP) indicates the upper limit of the operation completion rate of round(i), m U Indicates that the commissioning completion rate exceeds the upper limit and the margin is adjusted.

[0054] From the above description, it can be seen that the goal of dynamic adjustment of the low-frequency load shedding plan is to control the commissioning completion rate of each round of low-frequency load shedding in the regional power grid between the upper and lower limits allowed. Further setting the adjustment margin is to ensure that the adjustment of the low-frequency load shedding plan has a certain lead time, so as to avoid adjusting the low-frequency load shedding plan after the commissioning completion rate index exceeds the limit, resulting in a lag in correction time.

[0055] Furthermore, the auxiliary decision-making of the low-frequency load reduction scheme is performed to generate a dynamic adjustment scheme for low-frequency load reduction, and obtain a set of adjustment round items, including:

[0056] Determine the upper and lower limits of load shedding in each low-frequency load shedding round:

[0057] When Rate(round(i))>Rate(round(i),UP)·m U hour

[0058] Adjustment upper limit: P u (round(i),adj)=P(round(i),req)·[Rate(round(i))-Rate(round(i),DN)·m D ];

[0059] Adjustment lower limit: P d (round(i),adj)=P(round(i),req)·[Rate(round(i))-Rate(round(i),UP)·m U ];

[0060] When Rate(round(i))<Rate(round(i),DN)·m D hour

[0061] Adjustment upper limit: P u (round(i),adj)=P(round(i),req)·[Rate(round(i),UP)·m U -Rate(round(i))];

[0062] Adjustment lower limit: P d (round(i),adj)=P(round(i),req)·[Rate(round(i),DN)·m D -Rate(round(i))];

[0063] Determine the set of adjustable resources:

[0064] If Rate(round(i))>Rate(round(i),UP)·m U , then the set of adjustable resources is all round items in the dynamic adjustment resource pool that belong to round (i) and whose setting state is "invested";

[0065] If Rate(round(i))<Rate(round(i),DN)·m D, then the set of adjustable resources is all round items in the dynamic adjustment resource pool that belong to round (i) and whose setting status is "exit";

[0066] The low-frequency load shedding amount adjustment and allocation based on the feeder load properties and the regional load proportion are performed to generate a low-frequency load shedding dynamic adjustment plan and obtain a set of adjustment round items.

[0067] Furthermore, the under-frequency load shedding amount is adjusted and allocated based on the feeder load properties, including:

[0068] The attributes of the low-frequency load shedding round item model include the low-frequency load shedding round to which it belongs, the associated low-frequency load shedding device and the load, and the attributes of the feeder load model include the load property and the region in which it is located;

[0069] The round items in the adjustable resource set are grouped according to their associated load properties, and the groups are sorted:

[0070] If Rate(round(i))>Rate(round(i),UP)·m U , then sort the groups according to the importance of the associated load properties from high to low, and adjust the load shedding according to the sorting order;

[0071] If Rate(round(i))<Rate(round(i),DN)·m D , then sort the groups according to the importance of the associated load properties from low to high, and allocate and adjust the load shedding according to the sorting order;

[0072] The sorted groups are G1, G2, ..., G N ;

[0073] The adjustable load shedding capacity of each group (i.e. the total active load of the feeder corresponding to all round items in each group) is

[0074] The target load shedding amount for each group is

[0075] Adjust the round item collection to Item adj .

[0076] when , then select the adjustment round item from G1 to form Item adj ,

[0077] when When

[0078] when Then continue to select the adjustment round item from G2 and form Item together with G1 adj ,

[0079] when When

[0080] when Then continue to select the adjustment round item from G3, and together with G1 and G2 form Item adj ,

[0081] In this way, the target load shedding amount of each group is determined in turn.

[0082] Furthermore, the adjustment and allocation of the low-frequency load shedding amount based on the regional load proportion includes:

[0083] For the group whose target adjusted load shedding amount is less than the adjustable load shedding amount, the round items contained in it are secondary grouped according to the area where the load associated with the round items is located to form several regional groups, and then the adjusted load shedding amount is allocated to each regional group according to the load proportion of the area to which each group belongs.

[0084] From the above description, it can be seen that a low-frequency load shedding adjustment and allocation strategy that comprehensively considers the feeder load properties and the grid partition load ratio is proposed. First, the load shedding allocation is adjusted based on the feeder load properties, and then the load shedding allocation is adjusted according to the grid partition load ratio for feeder loads of the same nature. It not only complies with the principles of formulating low-frequency load shedding plans for power grids and reduces the impact on important loads, but also takes into account the principle of fair distribution of load shedding in each grid partition.

[0085] Further, step 5 comprises:

[0086] According to the low-frequency load shedding round item model and the low-frequency load shedding device model described in step 1, the low-frequency load shedding device associated with the round item is found, and then the low-frequency load shedding function pressure plate associated with the round item is found by the low-frequency load shedding device to determine the low-frequency load shedding function pressure plate corresponding to each round item in the round item set to adjust the low-frequency load shedding function pressure plate, so as to form a low-frequency load shedding function pressure plate control sequence;

[0087] By executing the low-frequency load reduction function pressure plate control sequence, the adjustment of the operation round item in round (i) is completed, thereby achieving the adjustment of its operation completion rate.

[0088] From the above description, it can be seen that by using the remote on / off control function of the pressure plate of the feeder low-frequency load reduction function, the adjustment plan can be automatically issued and executed, thereby reducing a large number of manual pressure plate on / off operations.

[0089] Further, step 8 comprises:

[0090] Each time a round item is selected into the adjustment round item set, the adjustment failure counter is assigned a value according to its adjustment situation: if the adjustment fails, the value of the adjustment failure counter is increased by "1"; otherwise, the value of the adjustment failure counter is set to "0";

[0091] When the value of the adjustment failure counter reaches the preset upper limit, the freeze timer starts timing until the freeze time upper limit is reached, and then the values ​​of the adjustment failure counter and the freeze timer are reset to "0".

[0092] From the above description, it can be seen that after the above rule measures are taken, the round items whose consecutive adjustment failures reach the preset upper limit will no longer be selected into the dynamic adjustment resource pool, and they will be eligible for re-selection after a period of freezing. This can not only avoid repeated selection of adjustment failure round items during the dynamic adjustment of the low-frequency load reduction plan, but also re-select the round items whose pressure plate control function has returned to normal into the dynamic adjustment resource pool, avoiding the problem of a large number of adjustable resources being unavailable.

[0093] Please refer to Figure 2 Another embodiment of the present invention provides a dynamic intelligent management and control system for a regional power grid low-frequency load shedding scheme, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, each step of the above-mentioned dynamic intelligent management and control method for a regional power grid low-frequency load shedding scheme is implemented.

[0094] The present invention discloses a method and system for dynamic intelligent control of a low-frequency load shedding scheme for a regional power grid. Based on real-time monitoring and judgment of the low-frequency load shedding function, the present invention comprehensively considers the nature and level of the feeder load, develops a real-time auxiliary decision-making technology for the low-frequency load shedding scheme, and intelligently generates a dynamic adjustment scheme for the load shedding amount. By remotely switching on and off the low-frequency load shedding function pressure plate of the feeder, the dynamic control of the low-frequency load shedding scheme for the regional power grid is realized, and the correctness and rationality of the preparation of the low-frequency load shedding scheme for the regional power grid and the timeliness of the scheme adjustment are ensured. The following is an explanation through a specific implementation method:

[0095] Embodiment 1

[0096] Please refer to Figure 1 A dynamic intelligent control method for a regional power grid low-frequency load shedding scheme is implemented by relying on a regional power grid dispatching control system (hereinafter referred to as a control system), a substation automation system safety zone I data communication gateway, and a substation low-frequency load shedding device (including a decentralized low-frequency load shedding device and a centralized low-frequency load shedding device), and includes the following steps:

[0097] Step 1: Establish a low-frequency load reduction function model for the regional power grid.

[0098] The regional power grid low-frequency load shedding function model comprises: a low-frequency load shedding rotation table model, a low-frequency load shedding rotation item model, a low-frequency load shedding device model and a feeder load model.

[0099] 1) Low-frequency load shedding round table model: corresponding to low-frequency load shedding rounds.

[0100] 2) Low-frequency load shedding round item model: corresponds to the low-frequency load shedding feeder, including the low-frequency load shedding round, the associated low-frequency load shedding device, the load and other attributes.

[0101] 3) Low-frequency load reduction device model: corresponding to decentralized and centralized low-frequency load reduction devices, describing the round items associated with the device and the functional pressure plate, frequency setting, action delay setting, alarm signal and action signal corresponding to each round item.

[0102] 4) Feeder load model: corresponds to the load of the under-frequency load shedding feeder, including the following attributes:

[0103] ① Load nature: used to characterize the importance of loads, including high-risk users, important users, high-proportion livelihood loads, medium-proportion livelihood loads, low-proportion livelihood loads, industrial and commercial loads, and distributed power access loads.

[0104] ②Location: used to describe the power grid in the area where the load is located.

[0105] Step 2: Monitor and evaluate the low-frequency load reduction function of the regional power grid.

[0106] Based on the regional power grid low-frequency load reduction function model described in step 1 and the feeder low-frequency load reduction function pressure plate status, set value, low-frequency load reduction device operating status and feeder load power collected by the control system, real-time monitoring and analysis of the regional power grid low-frequency load reduction function is achieved.

[0107] For the convenience of description, the symbols shown in Table 1 are defined.

[0108] Table 1 Symbol Definition

[0109]

[0110] The calculation method of the operating index of the low-frequency load reduction function of the regional power grid is shown in Table 2:

[0111] Table 2 Calculation method of low-frequency load reduction function operation index

[0112]

[0113] Note: ①item(j).Round_ID=i, that is, the round item item(j) belongs to the round round(i).

[0114] ②item(j).Area_ID=k, that is, the feeder load corresponding to the round item item(j) is in the power grid partition area(k).

[0115] In summary, based on the low-frequency load shedding function model of the regional power grid and the feeder low-frequency load shedding function pressure plate status, set value, low-frequency load shedding device operation status and feeder load power collected by the control system, it is possible to judge whether the functions of each round of low-frequency load shedding in the regional power grid are normal, and on this basis, calculate the load shedding amount and operation completion rate of each low-frequency load shedding round, and further judge whether the operation completion rate of each low-frequency load shedding round meets the requirements.

[0116] Step 3: The low-frequency load reduction scheme dynamically adjusts the resource pool initialization.

[0117] 1) The round items that meet the following four conditions are selected into the low-frequency load reduction scheme dynamic adjustment resource pool:

[0118] ①judge(item(j))=1, which means that the function of the item in this round is judged to be normal.

[0119] ②P(item(j),op)>0, that is, the feeder corresponding to the round item has not experienced a reverse flow due to the access to distributed power sources (injecting active power into the system). Specifically, when the operational load shedding amount of the round item is less than 0, it means that the feeder corresponding to the round item has experienced a reverse flow due to the access to distributed power sources, that is, active power has been injected into the system. When the power output of the power grid is insufficient and the frequency drops, the access of distributed power sources helps to restore the stability of the power grid frequency. Therefore, for such round items, not only can they not be included in the low-frequency load reduction dynamic adjustment resource pool, but also when they are set to the "input" state, the corresponding feeder low-frequency load reduction function pressure plate should be promptly withdrawn.

[0120] ③ The feeder load associated with the round item is not an "uninterruptible load". Among them, uninterruptible loads such as power supply loads for major conferences and activities must ensure stable and reliable continuous power supply, and power supply cannot be interrupted even in the event of a frequency event. Therefore, for such round items, when they are set to the "on" state, the corresponding feeder low-frequency load reduction function pressure plate should be withdrawn in time.

[0121] ④count fail-num,item(j) <count fail-num,u , that is, the number of consecutive adjustment failures of the round item does not reach the preset upper limit. count fail-num,item(j) Indicates the value of the adjustment failure counter of round item(j), count fail-num,u Indicates the preset upper limit allowed for consecutive adjustment failures of round item(j).

[0122] To facilitate the following description, the resource pool for dynamic adjustment of the low-frequency load reduction scheme is recorded as Item res-pool .

[0123] Item res-pool It is a collection of round items. When the commissioning completion rate of the low-frequency load reduction round of the power grid does not meet the requirements, you can adjust Item res-pool The load shedding amount of the low-frequency load shedding round can be changed by turning on / off the round item in the control, thereby realizing the correction control of the completion rate of the low-frequency load shedding round.

[0124] 2) If the round item does not meet the above conditions ② or ③, then:

[0125] 2.1) Check whether the setting status of the round item is "on" state. If so, change its setting status to "off" state;

[0126] 2.2) Check whether the feeder low-frequency load reduction function pressure plate corresponding to the round item is currently in the "on" state. If so, the pressure plate should be remotely operated on the dispatching control system to exit.

[0127] The above initialization of the dynamic adjustment resource pool and the processing of the round items that meet condition ② or condition ③ are preliminary processing performed before the official start of the dynamic adjustment of the low-frequency load reduction scheme. The purpose includes two aspects: one is to complete the initialization of the dynamic adjustment resource pool to prepare for the selection of adjustable resources when making auxiliary decisions for the dynamic adjustment of the low-frequency load reduction scheme; the other is to complete the processing of the round items that do not meet condition ② or condition ③, and ensure that their setting status is "exit", and the corresponding feeder low-frequency load reduction protection function pressure plate is in the "exit" state.

[0128] Step 4: Dynamically adjust the low-frequency load reduction plan to assist decision making.

[0129] When it is determined that there is a low-frequency load shedding round whose commissioning completion rate does not meet the requirements, the low-frequency load shedding plan auxiliary decision-making process is started to generate a low-frequency load shedding dynamic adjustment plan, which is detailed as follows:

[0130] The goal of dynamic adjustment of the low-frequency load shedding scheme is to control the completion rate of each round of low-frequency load shedding in the regional power grid within the upper and lower limits allowed. That is:

[0131] Rate(round(i),DN)≤Rate(round(i))≤Rate(round(i),UP);

[0132] Generally speaking, Rate(round(i), DN) takes a value of 100%, and Rate(round(i), UP) takes a value of 105%. In order to ensure the advance amount of the scheme adjustment, the commissioning completion rate exceeds the upper limit adjustment margin mU and lower limit adjustment margin m D The adjustment margin is set to ensure that the adjustment of the low-frequency load reduction plan (that is, the over-limit correction control of the low-frequency load reduction operation completion rate) has a certain advance amount, so as to avoid the adjustment of the low-frequency load reduction plan after the operation completion rate index exceeds the limit, resulting in a lag in the correction time. That is:

[0133] Rate(round(i),DN)·m D ≤Rate(round(i))≤Rate(round(i),UP)·m U ;

[0134] The adjustment margin can be set manually. Generally speaking, m U The value is 0.997, m D The value is 1.003.

[0135] 1) Determine the upper and lower limits of load shedding adjustment:

[0136] ①When Rate(round(i))>Rate(round(i),UP)·m U hour

[0137] Adjustment upper limit: P u (round(i),adj)=P(round(i),req)·[Rate(round(i))-Rate(round(i),DN)·m D ]

[0138] Adjustment lower limit: P d (round(i),adj)=P(round(i),req)·[Rate(round(i))-Rate(round(i),UP)·m U ]

[0139] ②When Rate(round(i))<Rate(round(i),DN)·m D hour

[0140] Adjustment upper limit: P u (round(i),adj)=P(round(i),req)·[Rate(round(i),UP)·m U -Rate(round(i))]

[0141] Adjustment lower limit: P d (round(i),adj)=P(round(i),req)·[Rate(round(i),DN)·m D-Rate(round(i))]

[0142] 2) The adjustable resource set of round (i) is recorded as Item adj-res

[0143] ①When Rate(round(i))>Rate(round(i),UP)·m U hour

[0144] Item adj-res ={item(j)|item(j).Round_ID=round(i)∧set(item(j))=1∧item(j)∈Item res-pool}

[0145] That is, all round items in the dynamic adjustment resource pool that belong to round (i) and whose setting state is "invested";

[0146] ②When Rate(round(i))<Rate(round(i),DN)·m D hour

[0147] Item adj-res ={item(j)|item(j).Round_ID=round(i)∧set(item(j))=0∧item(j)∈Item res-pool}

[0148] That is, all round items in the dynamic adjustment resource pool that belong to round (i) and whose setting status is "exit".

[0149] 3) Adjustment and allocation of low-frequency load shedding based on the characteristics of feeder load.

[0150] 3.1) Item adj-res The round terms in are grouped according to the nature of their associated loads:

[0151] ①When Rate(round(i))>Rate(round(i),UP)·m U hour

[0152] The groups are sorted from high to low according to the importance of the associated loads, and the load shedding amount is preferentially allocated to the groups with high load importance.

[0153] Specifically, when the completion rate of low-frequency load reduction exceeds the upper limit, the load shedding amount should be reduced. The so-called reduction of load shedding amount means to withdraw the low-frequency load reduction function of some rotation items, and give priority to withdrawing the low-frequency protection function of important loads. In this way, the low-frequency protection corresponding to the important load will not be activated, and the feeder load will not be cut off.

[0154] ②When Rate(round(i))<Rate(round(i),DN)·m D hour

[0155] The groups are sorted from low to high according to the importance of the associated loads, and the load shedding amount is preferentially allocated to the groups with low load importance.

[0156] Specifically, when the completion rate of low-frequency load reduction operation exceeds the lower limit, the load shedding amount should be increased. The so-called increase in load shedding amount means that a part of the low-frequency load reduction function of the standby rotation item should be put into use, that is, feeders with low load importance should be given priority, and the low-frequency protection function of these feeders should be put into use first.

[0157] 3.2) The sorted groups are: G1, G2, …, G N ;

[0158] The adjustable load shedding capacity of each group (i.e. the total active load of the feeder corresponding to all round items in each group) is:

[0159] The target adjustment load shedding of each group is:

[0160] The set of selected adjustment round items is Item adj .

[0161] 3.3) The target load shedding amount for each group is determined according to the following process:

[0162] 3.3.1) When , then select the adjustment round item from G1 to form Item adj .

[0163]

[0164] At this time, selecting the adjustment round item in the G1 group can meet the load shedding adjustment needs, so there is no need to allocate the adjusted load shedding amount for the other groups, and the corresponding target adjusted load shedding amount is 0.

[0165] 3.3.2) When When P G2 :

[0166] 3.3.2.1) When Then continue to select the adjustment round item from G2 and form Item together with G1 adj .

[0167]

[0168] 3.3.2.2) When When

[0169] when Then continue to select the adjustment round item from G3, and together with G1 and G2 form Item adj .

[0170]

[0171] In this way, the target load shedding amount of each group is determined in turn.

[0172] 4) Adjustment and allocation of low-frequency load shedding based on regional load proportion.

[0173] On the basis of the target adjusted load shedding amount of each grouping (divided by load nature) determined previously, for the grouping with the target adjusted load shedding amount less than the adjustable load shedding amount, the round items contained in the grouping are secondary grouped according to the area where the load associated with the round items is located, forming several regional groups, and then the adjusted load shedding amount is allocated to each regional grouping according to the load proportion of the area to which each group belongs.

[0174] For the round item grouping G x , 1≤x≤N, the set of round items selected by the group is Item adj,x .

[0175] like Item adj,x =G x ;

[0176] like x>1, then Item adj,x The round item selection process is as follows.

[0177] 4.1) G by region x The round items in are grouped into groups: A1, A2, …, A M ;

[0178] The areas corresponding to each group are: area(k1), area(k2),…, area(k M ), k1, k2, …, k M They are grouped as A1, A2, ..., A M The corresponding area ID;

[0179] The load of the area to which each group belongs is: P(area(k1)),P(area(k2)),…,P(area(k M ));

[0180] The adjustable load shedding capacity of each group (i.e. the total feeder load corresponding to the round items under each group) is:

[0181] 4.2) The first allocation target load shedding for each regional group is:

[0182]

[0183] The meaning of this formula is to determine the target load shedding amount of each regional grouping according to the load proportion of the power grid area to which each regional grouping belongs.

[0184] The target load shedding amount for each regional grouping is determined according to the load ratio of the power grid area to which each regional grouping belongs. and 1≤y≤M, A1,A2,…,A M Divided into 2 grouping sets:

[0185] A insuff,1 ={A y |P Ay ≤ΔP Ay,1}, A suff,1 ={A y |P Ay >ΔP Ay,1};

[0186] For A insuff,1 The target load shedding amount of the group That is The insufficient load shedding is

[0187] After the first distribution, the total amount of insufficient load shedding is

[0188] 4.3) Will be in A suff,1 The second allocation is performed in A suff,1 The second distribution target load shedding amount of each group is:

[0189] A y ∈A suff,1 ;

[0190] Continue to compare and A y ∈A suff,1 , A suff,1 Divided into 2 grouping sets:

[0191]

[0192] For A insuff,2 The target load shedding amount of the group That is The insufficient load shedding is

[0193] A y ∈A insuff,2

[0194] After the second distribution, the total amount of insufficient load shedding is

[0195]

[0196] 4.4) Will be in A suff,2 The third allocation is performed in A suff,2 The third distribution target load shedding amount for each group is:

[0197] A y ∈A suff,2 ;

[0198] Continue by comparing and A y ∈A suff,2 , A suff,2 Divide into 2 grouping sets, repeat the above process continuously, and finally determine the target load shedding amount for each area group.

[0199] 4.5) According to and The numerical relationship of , all regions are grouped into 2 categories:

[0200] and

[0201] Note: Regional Group A y Select Item adj,x The round item collection is Item adj,x,y ,but:

[0202] ①When A y ∈A insuff Item adj,x,y =A y ;

[0203] ②When A y ∈A suff When Item is determined, the following method is used adj,x,y :

[0204] If A y Contains N(A y) round items, sorted from large to small according to their corresponding feeder load power:

[0205] Choose n round items to form a round item combination, 1≤n≤N(A y ), among all possible combinations, the combination with the largest total feeder load power is The maximum value is Apparently:

[0206]

[0207] like Then in A y Select 1 round item that meets the following conditions:

[0208]

[0209] Item adj,x,y ={item(j1),item(j2),…,item(j α ),item(j β )}

[0210] According to the above method, the number of round items that need to be adjusted can be controlled to a minimum, thereby achieving rapid adjustment of the low-frequency load shedding amount.

[0211] 4.6) For A suff Regional grouping, generally, Item adj,x,y The total feeder load corresponding to the round term in is always greater than Record it as

[0212] If the actual target load shedding of round (i) is P (round (i), adj), then:

[0213]

[0214] 4.6.1) When P d (round(i),adj)≤P(round(i),adj)≤P u (round(i),adj)

[0215]

[0216] 4.6.2) When P(round(i),adj)>P u (round(i),adj)

[0217] Need to belong to A suff Item of the regional groupingadj,x,y Make adjustments. The upper and lower limits are respectively but:

[0218]

[0219] remember The upper and lower limits of the correction are but:

[0220]

[0221] remember From Select a subset of round items that meet the following conditions, and record this subset as

[0222]

[0223] The following method is used to determine

[0224] like Contains N(A suff ) round items, sorted from large to small according to their corresponding feeder load power:

[0225]

[0226] Choose n round items to form a round item combination, 1≤n≤N(A suff ), among all possible combinations, the combination with the largest total feeder load power is The maximum value is Apparently:

[0227]

[0228] Obviously there exists γ that satisfies like but:

[0229]

[0230] On the contrary, In Select 1 round item that meets the following conditions:

[0231] MIN P(item(j′ δ )),

[0232]

[0233]

[0234] Then for A suff Item of the regional grouping adj,x,y Make adjustments and select Item after making adjustments adj,x The round item set is Item′ adj,x,y :

[0235] A y ∈A suff .

[0236] Step 5: Execute the regional power grid low-frequency load reduction adjustment plan.

[0237] Step 4: For the low-frequency load shedding operation completion rate exceeding the limit in round (i), the corresponding low-frequency load shedding scheme adjustment method is given to generate the adjustment round item set Item adj .

[0238] According to the round item model and the low-frequency load reduction device model described in step 1, the low-frequency load reduction device associated with the round item can be found, and then the low-frequency load reduction function pressure plate associated with the round item can be found from the low-frequency load reduction device. adj The low-frequency load shedding function pressure plate corresponding to each round item in the process forms a low-frequency load shedding function pressure plate control sequence. By executing the low-frequency load shedding function pressure plate control sequence, the adjustment of the operation round item in round (i) is completed, thereby achieving the adjustment of its operation completion rate.

[0239] Step 51, execution mode of the low frequency load shedding function pressure plate control sequence.

[0240] 1) Open-loop mode

[0241] In open-loop mode, while generating the low-frequency load reduction function pressure plate control sequence, a waiting delay is set. Before the delay ends, the control sequence can be manually reviewed and confirmed to decide whether to start or cancel the execution of the control sequence; if the execution of the control sequence is not confirmed before the delay ends, the program will automatically cancel the execution of the control sequence.

[0242] 2) Closed-loop mode

[0243] In closed-loop mode, the low-frequency load reduction function pressure plate control sequence generated by the system will be automatically submitted to the basic platform of the control system for execution without waiting for manual confirmation.

[0244] In actual application, the execution mode of the low-frequency load reduction function pressure plate control sequence can be manually selected, and the waiting delay in the open-loop mode can be set.

[0245] Step 52: Execution of the low-frequency load reduction function pressure plate control sequence.

[0246] The execution of the low-frequency load shedding function pressure plate control sequence is based on the remote control function of the control system. In the control sequence, the control objects (low-frequency load shedding function pressure plates) of different substations can be controlled in parallel, while the control objects (low-frequency load shedding function pressure plates) of the same substation are controlled in series.

[0247] The control command is sent to the safety zone I data communication gateway at the substation end in the form of IEC 104 dual-point control command ASDU 46, which is then converted by the substation safety zone I data communication gateway into an intra-station communication protocol instruction and sent to the low-frequency load reduction device at the bay layer for execution, thereby completing the control of the feeder low-frequency load reduction function pressure plate.

[0248] Step 6: Analyze and display the execution deviation of the regional power grid low-frequency load reduction adjustment plan.

[0249] According to the status of the low-frequency load reduction function pressure plate of the feeder returning to the control system at the plant end, the execution of the low-frequency load reduction function pressure plate control sequence is analyzed and displayed on the human-machine interface of the control system.

[0250] Press the low-frequency load reduction function to control whether it is successful. adj Divided into 2 categories: Item collection of rounds in which the pressure plate controls successfully adj-succ And the round item collection Item where the pressure plate control failed adj-fail .

[0251] Step 7: Modify Item adj-succ The tuning status of the round items in the collection.

[0252] Make it consistent with the current state of the feeder low-frequency load reduction function pressure plate to ensure that the system does not misjudge the function of this round of items as abnormal.

[0253] Step 8: Item adj The count of round items in the collection fail-num,item(j) 、count freeze-time,item(j) Assignment.

[0254] For Item adj-fail The round items in the control failure of the corresponding low-frequency load reduction function pressure plate also means that the adjustment of the input / output of these round items has failed. In order to avoid repeated selection of the round items that have failed to adjust in the subsequent low-frequency load reduction scheme adjustment control, the following measures are taken:

[0255] For each underfrequency load shedding round, add 1 adjustment failure counter count fail-num,item(j) , and 1 freeze timer count freeze-time,item(j) , both of which are set to "0" as their initial values. Let the preset upper limit of the number of consecutive adjustment failures be count fail-num,u , the upper limit of the freezing time count is countfreeze-time,u In this embodiment, count is set fail-num,u 3 times, count freeze-time,u for 5 minutes.

[0256] count fail-num,item(j) 、count freeze-time,item(j) The assignment rules are as follows:

[0257] ① Round item (j) is selected into Item each time adj , will adjust count according to its adjustment situation fail-num,item(j) Assign value: If the adjustment fails, count fail-num,item(j) The value of is increased by "1"; otherwise, count fail-num,item(j) Assign the value to "0".

[0258] ②When count fail-num,item(j) The value reaches count fail-num,u After that, count freeze-time,item(j) Start timing until count freeze-time,item(j) Reach count freeze-time,u After that, count again fail-num,item(j) 、count freeze-time,item(j) Set to "0".

[0259] After taking the above rules and measures, the round items whose consecutive adjustment failures reach the preset upper limit will no longer be selected into the dynamic adjustment resource pool (see step 3 for details), and they will be eligible for re-selection after a period of freezing. This can not only avoid repeated selection of adjustment failure round items during the dynamic adjustment of the low-frequency load reduction plan, but also re-select the round items whose pressure plate control function has returned to normal into the dynamic adjustment resource pool, avoiding the problem of a large number of adjustable resources being unavailable.

[0260] Step 9: Return to step 3 and repeat the dynamic adjustment process of the low-frequency load reduction scheme from steps 3 to 8.

[0261] Embodiment 2

[0262] Please refer to Figure 2 A dynamic intelligent management and control system 1 for a regional power grid low-frequency load shedding scheme includes a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3. When the processor 3 executes the computer program, each step of a dynamic intelligent management and control method for a regional power grid low-frequency load shedding scheme in embodiment 1 is implemented.

[0263] In summary, the present invention provides a method and system for dynamic intelligent control of a low-frequency load shedding scheme for a regional power grid, and develops a dynamic adjustment technology for a low-frequency load shedding scheme for a regional power grid based on a dispatching and control system. A low-frequency load shedding function model for the regional power grid is constructed, and the low-frequency load shedding function operation information collected by the control system is used to perform online operation monitoring and automatic analysis of the low-frequency load shedding function, thereby realizing dynamic adjustment auxiliary decision-making for the low-frequency load shedding scheme, real-time distribution and execution of the adjustment scheme, and online evaluation of the adjustment effect. The application of this technology can enable the low-frequency load shedding scheme to adapt to changes in the power grid load, ensuring the rationality of the low-frequency load shedding scheme and the timeliness of the scheme adjustment.

[0264] In addition, a low-frequency load shedding adjustment and allocation strategy is proposed that comprehensively considers the feeder load properties and the grid partition load ratio. First, the load shedding allocation is adjusted based on the feeder load properties, and then the load shedding allocation is adjusted according to the grid partition load ratio for feeder loads of the same nature. This not only complies with the principles of formulating low-frequency load shedding plans for the power grid and reduces the impact on important loads, but also takes into account the principle of fair distribution of load shedding in each grid partition.

[0265] At the same time, the intelligent and automated level of operation and management of the low-frequency load shedding function of the regional power grid has been improved. The low-frequency load shedding plan adjustment auxiliary decision-making function can be used to intelligently generate adjustment plans, thereby reducing a large amount of manual compilation workload; by using the remote on / off control function of the feeder low-frequency load shedding function pressure plate, the adjustment plan can be automatically issued and executed, thereby reducing a large amount of manual pressure plate on / off operations.

[0266] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dynamic intelligent control method for a regional power grid low-frequency load reduction scheme, characterized in that: Includes steps: Step 1: Establish a low-frequency load shedding function model for a regional power grid, wherein the low-frequency load shedding function model for a regional power grid includes: a low-frequency load shedding round table model, a low-frequency load shedding round item model, a low-frequency load shedding device model, and a feeder load model; Step 2: monitor the low-frequency load shedding function of the regional power grid, determine whether the functions of each round of low-frequency load shedding of the regional power grid are normal, calculate the load shedding amount and operation completion rate of each low-frequency load shedding round, and determine whether the operation completion rate of each low-frequency load shedding round meets the preset requirements; Step 3: Initialize the dynamic adjustment resource pool of the low-frequency load reduction solution; Step 4: When it is determined that there is a low-frequency load shedding round whose operation completion rate does not meet the preset requirements, an auxiliary decision is made on the low-frequency load shedding plan, a low-frequency load shedding dynamic adjustment plan is generated, and a set of adjustment round items is obtained; Step 5: Based on the regional power grid low-frequency load reduction function model, the feeder low-frequency load reduction function plate remote switching / retraction control function of the power grid dispatching control system is applied to execute the regional power grid low-frequency load reduction dynamic adjustment plan; Step 6: Analyze and display the execution deviation of the low-frequency load shedding adjustment plan of the regional power grid, and divide the adjustment round item set into a round item set in which the low-frequency load shedding function pressure plate is successfully controlled and a round item set in which the low-frequency load shedding function pressure plate fails to control; Step 7, modifying the setting state of the round item in the round item set in which the pressure plate is successfully controlled; Step 8: assigning values ​​to the adjustment failure counter and the freezing timer of the round items in the adjustment round item set; Step 9: Return to step 3 and repeat the dynamic adjustment process of the low-frequency load reduction scheme from steps 3 to 8.

2. According to claim 1, a dynamic intelligent control method for a regional power grid low-frequency load reduction scheme is characterized in that: Step 3 includes: The round items that meet the following four conditions are selected into the dynamic adjustment resource pool of the low-frequency load reduction scheme: ① The function of the item in this round is judged to be normal; ② The feeder corresponding to the round item does not experience power flow reversal due to the access to distributed power sources; ③The feeder load associated with the round item is not "non-interruptible load"; ④ The value of the adjustment failure counter of the round item does not reach the preset allowable upper limit.

3. The method for dynamic intelligent control of a regional power grid low-frequency load reduction scheme according to claim 2, characterized in that: Step 3 also includes: If the round item does not meet the above conditions ② or ③, then: Check whether the setting status of the round item is "on"; if so, change its setting status to "off"; Check whether the feeder low-frequency load reduction function pressure plate corresponding to the round item is currently in the "on" state. If so, the pressure plate should be remotely operated on the dispatching control system to exit.

4. The method for dynamic intelligent control of a regional power grid low-frequency load reduction scheme according to claim 1, characterized in that: The determination of whether the operation completion rate of each low-frequency load reduction round meets the preset requirements includes: If Rate(round(i),DN)·m D ≤Rate(round(i))≤Rate(round(i),UP)·m U , then the operation completion rate of the low-frequency load shedding round meets the requirements, otherwise, the operation completion rate of the low-frequency load shedding round does not meet the requirements. In the formula, round(i) represents the low-frequency load shedding round with ID i, Rate(round(i)) represents the operation completion rate of round(i), Rate(round(i),DN) represents the lower limit of the operation completion rate of round(i), and m D Indicates the adjustment margin when the commissioning completion rate exceeds the lower limit, Rate(round(i),UP) indicates the upper limit of the commissioning completion rate of round(i), m U Indicates that the commissioning completion rate exceeds the upper limit and the margin is adjusted.

5. The method for dynamic intelligent control of a regional power grid low-frequency load reduction scheme according to claim 4, characterized in that: The auxiliary decision-making of the low-frequency load reduction scheme is performed to generate a dynamic adjustment scheme for low-frequency load reduction, and obtain a set of adjustment round items, including: Determine the upper and lower limits of load shedding in each low-frequency load shedding round: When Rate(round(i)) > Rate(round(i),UP)·m U When Adjustment cap: Adjust the lower limit: When Rate(round(i)) < Rate(round(i), DN)·m D When Adjustment cap: Adjust the lower limit: Determine the set of adjustable resources: If Rate(round(i))>Rate(round(i),UP)·m U , then the set of adjustable resources is all round items in the dynamic adjustment resource pool that belong to round (i) and whose setting state is "invested"; If Rate(round(i))<Rate(round(i),DN)·m D , then the set of adjustable resources is all round items in the dynamic adjustment resource pool that belong to round (i) and whose setting status is "exit"; The low-frequency load shedding amount adjustment and allocation based on the feeder load properties and the regional load proportion are performed to generate a low-frequency load shedding dynamic adjustment plan and obtain a set of adjustment round items.

6. A dynamic intelligent control method for a regional power grid low-frequency load reduction scheme according to claim 5, characterized in that: Adjust and distribute the low-frequency load shedding based on the characteristics of the feeder load, including: The attributes of the low-frequency load shedding round item model include the low-frequency load shedding round to which it belongs, the associated low-frequency load shedding device and the load, and the attributes of the feeder load model include the load property and the region in which it is located; The round items in the adjustable resource set are grouped according to their associated load properties, and the groups are sorted: If Rate(round(i))>Rate(round(i),UP)·m U , then sort the groups according to the importance of the associated load properties from high to low, and adjust the load shedding according to the sorting order; If Rate(round(i))<Rate(round(i),DN)·m D , then sort the groups according to the importance of the associated load properties from low to high, and allocate and adjust the load shedding according to the sorting order; The sorted groups are G1, G2, ..., G N ; The adjustable load shedding capacity of each group is The target load shedding amount for each group is when , then select the adjustment round item from G1 to form Item adj , when When when Then continue to select the adjustment round item from G2 and form Item together with G1 adj , when When when Then continue to select the adjustment round item from G3, and together with G1 and G2 form Item adj , In this way, the target load shedding amount of each group is determined in turn.

7. A dynamic intelligent control method for a regional power grid low-frequency load reduction scheme according to claim 6, characterized in that: The adjustment and allocation of the low-frequency load shedding amount based on the regional load proportion includes: For the group whose target adjusted load shedding amount is less than the adjustable load shedding amount, the round items contained in it are secondary grouped according to the area where the load associated with the round items is located to form several regional groups, and then the adjusted load shedding amount is allocated to each regional group according to the load proportion of the area to which each group belongs.

8. The method for dynamic intelligent control of a regional power grid low-frequency load reduction scheme according to claim 1, characterized in that: Step 5 includes: According to the low-frequency load shedding round item model and the low-frequency load shedding device model described in step 1, the low-frequency load shedding device associated with the round item is found, and then the low-frequency load shedding function pressure plate associated with the round item is found by the low-frequency load shedding device to determine the low-frequency load shedding function pressure plate corresponding to each round item in the round item set to adjust the low-frequency load shedding function pressure plate, so as to form a low-frequency load shedding function pressure plate control sequence; By executing the low-frequency load reduction function pressure plate control sequence, the adjustment of the operation round item in round (i) is completed, thereby achieving the adjustment of its operation completion rate.

9. The method for dynamic intelligent control of a regional power grid low-frequency load reduction scheme according to claim 1, characterized in that: Step 8 includes: Each time a round item is selected into the adjustment round item set, the adjustment failure counter is assigned a value according to its adjustment situation: if the adjustment fails, the value of the adjustment failure counter is increased by "1"; otherwise, the adjustment failure counter is assigned a value of "0"; When the value of the adjustment failure counter reaches the preset upper limit, the freeze timer starts timing until the value of the freeze timer reaches the upper limit of the freeze time, and then the values ​​of the adjustment failure counter and the freeze timer are reset to "0".

10. A dynamic intelligent management and control system for a regional power grid low-frequency load reduction scheme, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, it implements the various steps of the dynamic intelligent control method of a regional power grid low-frequency load reduction scheme as described in any one of claims 1 to 9.

Images