A frequency expansion defense line control system and control method with dispersed response additional centralized control

Abstract

The application discloses a frequency expansion defense line control system of dispersed response additional centralized control and a control method thereof. The system realizes stable control of the power system frequency by establishing a hierarchical architecture. In the two-layer architecture, the dispersed execution station is responsible for monitoring the bus frequency and reporting the controllable quantity or the actual control quantity to the additional control substation when the frequency is abnormal. The additional control substation is responsible for summarizing information, judging whether the control quantity is sufficient, and adding the control quantity to the dispersed execution station when the control quantity is insufficient. In the three-layer architecture, the additional centralized control master station is added for the cross-resource station to coordinate the control quantity between different resource stations, ensure the system frequency stability, and report the controllable or coordinated control quantity to the additional centralized control master station according to the control demand. The master station optimizes the resources and controls according to the priority. The application can increase the coordination ability of the centralized control on the basis of ensuring the reliability of the dispersed action, so that the frequency emergency control defense line can accurately cut off the controllable resource of the predetermined control quantity, and the deficiency of the existing frequency emergency control defense line ability can be made up.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power control, in particular to a frequency expansion defense line system with dispersed response and additional centralized control and a control method. BACKGROUND

[0002] The existing frequency regulation resources are difficult to ensure that the system frequency is maintained within a safe range under the condition of continuous growth of load, and the frequency may continuously decrease to trigger low-frequency load shedding and cause the risk of large-scale power failure. In terms of frequency emergency control, the third defense line frequency and voltage emergency control technology triggered by signals is mainly adopted, and the lack of coordination of multi-type and multi-scale resources also makes it difficult to meet the requirements of online early warning reliability and sensitivity for complex and variable operation modes of high-proportion new energy power systems.

[0003] At present, the frequency emergency control device only reacts to the change of local electrical quantity to remove the local determined load line, which is beneficial to ensure the reliability of the action of the device itself, but on the other hand, it is not conducive to the coordination and optimization of the overall control behavior of the system. Even in the case of a large-scale power failure, it has been found that the frequency emergency control device cannot timely and correctly reflect the system dynamics, which is also a manifestation of the complexity of the stability characteristics of the power system caused by the development of the power system.

[0004] At the same time, the frequency emergency control device acts according to the fixed strategy setting value off-line, and in the scenes of load line power change, pumped storage state power generation and pump state switching, energy storage charging and discharging conversion, etc., the controllable resource amount is under control in the low-frequency or high-frequency scene, which becomes a defect of the existing frequency emergency control method and system. With the construction of new-type power systems, new-type energy storage, pumped storage, interruptible load, direct current, etc. Controllable resources have become important frequency control means of the power grid. How to exert their control ability will greatly reduce the influence on the people's livelihood load and traditional power supply under the condition of frequency abnormality, and enhance the safe and stable operation ability and power supply ability of the power grid. SUMMARY

[0005] The purpose of the present application is to provide a frequency expansion defense line control system and control method with dispersed response and additional centralized control, which increases the centralized coordination ability of centralized control on the basis of ensuring the reliability of dispersed action, so that the frequency emergency control defense line can accurately remove the controllable resources of the predetermined control amount, to make up for the deficiency of the existing frequency emergency control defense line capability.

[0006] Technical solution: To achieve the above-mentioned purpose, the frequency extension defense line control system with distributed response and additional centralized control described in the present invention includes a hierarchical architecture of distributed response and additional centralized control established based on resource sites, wherein for a single resource site, a two-layer architecture includes a distributed execution station and an additional control substation, and for multiple cross-resource sites, a three-layer architecture of an additional centralized control main station for cross-resource coordination is added on the basis of the two-layer architecture; communications are established between the distributed execution stations and the additional control substations, and between the additional control substations and the additional centralized control main station for data exchange.

[0007] Among them, the distributed execution station includes collecting bus voltage to calculate bus frequency fi, collecting resource electrical quantity to calculate electrical power, and pre-setting the execution station frequency action value Fs, delay constant Ts, and control quantity constant Psi; when the bus frequency fi is not less than the frequency action value Fs, the distributed execution station will send the bus frequency fi and controllable quantity Pci of the station to the additional control substation in real time; when the bus frequency fi is less than the frequency action value Fs and the duration is greater than the delay constant Ts, the distributed execution station will cut off or power modulate the controllable resources according to the control quantity constant Psi, and at the same time send the action time frequency value fai and the actual control quantity Pai to the additional control substation; where i represents the serial number of the distributed execution station.

[0008] The additional control substation is pre-set with a substation frequency action value and a total control quantity constant ∑Psj;

[0009] The additional control substation calculates the total controllable quantity ∑Pcj of all distributed execution stations based on the controllable quantity Pci sent by the distributed execution station i. When the total controllable quantity ∑Pcj is less than the substation total controllable quantity constant ∑Psj, the additional control substation reports an abnormal message of "insufficient controllable quantity";

[0010] The additional control substation adds up the actual control quantity Pai sent by the distributed execution station i to obtain the actual total control quantity ∑Paj of all distributed execution stations. When the actual total control quantity ∑Paj is less than the total control quantity constant ∑Psj, it further determines whether the substation total control quantity constant ∑Psj is less than the total controllable quantity ∑Pcj. If ∑Psj is less than ∑Pcj, the additional control substation adds (∑Psj-∑Paj) control quantities to the distributed execution stations under its jurisdiction and cuts off or modulates the power of the controllable resources. If ∑Psj is not less than ∑Pcj, the additional control substation adds (∑Pcj-∑Paj) control quantities to the distributed execution stations under its jurisdiction and cuts off or modulates the power of the controllable resources. Wherein, j represents the serial number of the additional control substation.

[0011] Wherein, for the three-layer architecture, when the total control amount value ∑Psj of the additional control substation j is less than the total controllable amount ∑Pcj, the additional control substation j calculates the controllable amount ∑Pkj of the station and sends it to the additional centralized control master station, otherwise, ∑Pkj is set to 0 and sent to the additional centralized control master station;

[0012] When the total control amount value ∑Psj of the additional control substation j is greater than the total controllable amount ∑Pcj, the additional control substation j performs additional control to the dispersed execution stations under its jurisdiction, and calculates the controllable amount ∑Ptj of the station and sends it to the additional centralized control master station.

[0013] Wherein, the additional centralized control master station, based on the controllable amount ∑Ptj of the additional control substation j sent by the additional control substation j, according to the controllable amount of the additional control substation sent by other resource stations, gives the controllable amount ∑Ptj of the additional control substation j to other additional control substations according to the pre-set resource control priority, and the controllable resources are executed by the execution stations under the jurisdiction of other additional control substations.

[0014] Wherein, the system is hierarchically deployed with online monitoring modules according to the province, the province, and the network, and the controllable resources within the jurisdiction of the monitoring and management authority and the state of the additional centralized control master station, the additional control substation and the dispersed execution station are monitored in real time.

[0015] Wherein, the method for the online monitoring module to monitor the controllable resources within the jurisdiction of the monitoring and management authority and the state of the additional centralized control master station, the additional control substation and the dispersed execution station in real time is:

[0016] When the additional control substation detects that the dispersed execution station under its jurisdiction has no strategy value and the communication is abnormal, the controllable amount of the dispersed execution station is excluded;

[0017] When the additional control substation detects that the dispersed execution station under its jurisdiction has a strategy value and the communication is abnormal, the action amount of the dispersed execution station during the abnormal period is set to be completely cut off, the total control amount value of the additional control substation is reduced by the cuttable amount sent by the dispersed execution station, and the dispersed execution station channel pressure plate is set. When the dispersed execution station cannot act abnormally, the additional control substation exits the dispersed execution station channel pressure plate with communication abnormality, and the total control amount value of the additional control substation is no longer reduced by the cuttable amount sent by the station;

[0018] When the additional control substation is abnormal, the dispersed execution station detects the communication abnormality, the dispersed execution station with a strategy value acts according to the set value; the dispersed execution station without a strategy value cannot receive the command and will not act; the additional centralized control master station defaults that the overall resources of the abnormal additional control substation are uncontrollable, and does not include the resources under the jurisdiction of the additional control substation into the unified control resource pool;

[0019] When the additional centralized control master station is abnormal, each additional control substation performs addition according to the required cut amount setting value, and when the control amount is insufficient, the additional centralized control master station is no longer sent.

[0020] The control method of the frequency expansion defense line control system with the above-mentioned distributed response additional centralized control is that, for a single resource station, the distributed execution station monitors the bus frequency in a two-layer architecture, when the bus frequency is higher than the set frequency action value, the distributed execution station reports the controllable amount to the additional control substation, the additional control substation judges whether the total controllable amount of all distributed execution stations meets the demand, if not, the additional control substation will send an exception message, when the bus frequency is lower than the frequency action value and the duration exceeds the set value, the distributed execution station will directly control the controllable resource and report the actual control amount to the additional control substation, if the total control amount of all distributed execution stations is insufficient, the additional control substation adds the control amount to the distributed execution station;

[0021] For multiple cross-resource stations, in a three-layer architecture, when the total control amount setting value of the additional control substation is less than the total controllable amount, the coordinatable control amount is calculated and reported to the additional centralized control master station, otherwise, if the total control amount setting value is greater than the total controllable amount, the coordinated control amount is calculated and reported to the additional centralized control master station, the additional centralized control master station coordinates the control amount of the additional control substation of each resource station according to the resource control priority based on the information reported by each additional control substation, to realize the optimization and control of cross-site resources.

[0022] The control method of the two-layer architecture is specifically:

[0023] (1) When the bus frequency fi calculated by the distributed execution station i is not less than the frequency action value Fs, the distributed execution station i reports the bus frequency fi and the controllable amount Pci to the additional control substation in real time;

[0024] The additional control substation sums up the total controllable amount ∑Pcj of all distributed execution stations based on the controllable amount Pci reported by the distributed execution station i, when the total controllable amount ∑Pcj is less than the total control amount setting value ∑Psj of the substation, the additional control substation reports an "insufficient controllable amount" exception message;

[0025] (2) When the bus frequency fi calculated by the distributed execution station i is less than the frequency action value Fs and the duration is greater than the delay setting value Ts, the distributed execution station i performs cut-off or power modulation on the controllable resource according to the control amount setting value Psi, and simultaneously reports the action time frequency value fai and the actual control amount Pai to the additional control substation;

[0026] The additional control substation sums up the actual control amounts Pai uploaded by the distributed execution stations i to obtain an actual total control amount ∑Paj of all the distributed execution stations. When the actual total control amount ∑Paj is less than a total control amount setting value ∑Psj, it is further determined whether the substation total control amount setting value ∑Psj is less than a total controllable amount ∑Pcj. If ∑Psj is less than ∑Pcj, the additional control substation adds a control amount (∑Psj-∑Paj) to the distributed execution stations under its jurisdiction to cut off or power modulate the controllable resources. If ∑Psj is not less than ∑Pcj, the additional control substation adds a control amount (∑Pcj-∑Paj) to the distributed execution stations under its jurisdiction to cut off or power modulate the controllable resources. Wherein, i represents the serial number of the distributed execution station, and j represents the additional control substation.

[0027] The control method of the three-layer architecture is specifically as follows:

[0028] (1) When the bus frequency fi calculated by the distributed execution station i is not less than a frequency action value Fs, the distributed execution station i uploads the bus frequency fi and the controllable amount Pci to the additional control substation j in real time.

[0029] The additional control substation j sums up the controllable amounts Pci uploaded by the distributed execution stations i under its jurisdiction to obtain a total controllable amount ∑Pcj of all the distributed execution stations under its jurisdiction. When the total controllable amount ∑Pcj is less than a substation total control amount setting value ∑Psj, the additional control substation reports an “insufficient controllable amount” exception message.

[0030] (2) When the bus frequency fi calculated by the distributed execution station i is less than the frequency action value Fs and the duration is greater than a delay setting value Ts, the distributed execution station i cuts off or power modulates the controllable resources according to the control amount setting value Psi and uploads the action time frequency value fai and the actual control amount Pai to the additional control substation j.

[0031] The additional control substation j sums up the actual control amounts Pai uploaded by the distributed execution stations i under its jurisdiction to obtain an actual total control amount ∑Paj of all the distributed execution stations under its jurisdiction. When the actual total control amount ∑Paj is less than a total control amount setting value ∑Psj, it is further determined whether the substation total control amount setting value ∑Psj is less than a total controllable amount ∑Pcj. If ∑Psj is less than ∑Pcj, the additional control substation j adds a control amount (∑Psj-∑Paj) to the distributed execution stations under its jurisdiction to cut off or power modulate the controllable resources. If ∑Psj is not less than ∑Pcj, the additional control substation j adds a control amount (∑Pcj-∑Paj) to the distributed execution stations under its jurisdiction to cut off or power modulate the controllable resources.

[0032] When the total control amount value of the additional control substation j, ∑Psj, is less than the total controllable amount ∑Pcj, the additional control substation j calculates the controllable amount ∑Pkj of the station to be coordinated, ∑Pkj = ∑Pcj - ∑Psj, and sends the additional centralized control master station, otherwise, ∑Pkj is set to 0 and sent to the additional centralized control master station; when the total control amount value of the additional control substation j, ∑Psj, is greater than the total controllable amount ∑Pcj, the additional control substation j performs additional control to the dispersed execution station under its jurisdiction, and calculates the controllable amount ∑Ptj of the station to be coordinated, ∑Ptj = ∑Psj - ∑Pcj, and sends the additional centralized control master station;

[0033] The additional centralized control master station, based on the controllable amount ∑Ptj of the additional control substation j to be coordinated, according to the controllable amount of the additional control substation of other resource sites, sends the controllable amount ∑Ptj of the additional control substation j to be coordinated to the additional control substation of other resource sites according to the pre-set resource control priority, and the controllable resource is executed by the execution station under the jurisdiction of other additional control substations.

[0034] Wherein, i represents the sequence number of the dispersed execution station, and j represents the sequence number of the additional control substation.

[0035] Beneficial effects: the system and method have the following advantages: when the frequency of the power system is unstable, the system and method can act through non-load resources using a dispersed control mode, ensure the reliability of the action and complete the control of the basic resource amount; based on the dispersed control, after collecting the action results, the additional centralized control mode is used, so that the frequency emergency control defense line can accurately cut off the controllable resources of the predetermined control amount, to make up for the deficiency of the existing frequency emergency control defense line capability.

[0036] The system and method retain the basis of the frequency emergency control dispersed action, ensure the reliability of the frequency control of the massive resources, and realize the additional centralized control, so as to ensure the accuracy of the control amount under the fluctuation of the resource controllable amount. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a two-layer architecture configuration schematic diagram of the dispersed additional centralized control system;

[0038] Figure 2 It is a three-layer architecture configuration schematic diagram of the dispersed additional centralized control system;

[0039] Figure 3 Frequency expansion defense line architecture;

[0040] Figure 4 Two-layer architecture additional control process;

[0041] Figure 5 Three-layer architecture additional control process;

[0042] Figure 6System to device exception handling process. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described in detail below in combination with embodiments and drawings.

[0044] A frequency emergency control system of decentralized response and additional centralized control includes a two-layer architecture and a three-layer architecture, as shown in Figure 1 、 Figure 2 The two-layer architecture includes decentralized execution stations and additional control sub-stations, and the three-layer architecture includes decentralized execution stations, additional control sub-stations, and additional centralized control master stations.

[0045] The two-layer architecture is arranged according to resource types, such as used in energy storage control, and the decentralized execution stations are arranged at energy storage stations to collect energy storage electrical quantities and calculate frequency, power, and controllable quantities of the energy storage stations; the additional control sub-stations are arranged at central energy storage stations or at transformer substations in communication with multiple energy storage stations.

[0046] The three-layer architecture can be coordinated across resources, and the decentralized execution stations are arranged at pumped storage, energy storage, and load resource stations to collect resource station electrical quantities and calculate frequency, power, and controllable quantities; the additional control sub-stations are arranged according to resource types and are arranged at central resource stations or at transformer substations in communication with multiple resource stations; and the additional centralized control master stations are arranged at regional central transformer substations.

[0047] As shown in Figure 3 , a frequency emergency control system of decentralized response and additional centralized control is constructed taking frequency expansion defense lines as an example, and the control process is as follows.

[0048] I. Establishing a hierarchical architecture of decentralized response and additional centralized control based on resource stations.

[0049] 1) Arrange direct current execution stations, pumped storage execution stations, load execution units, and energy storage execution units according to resource types; arrange load execution stations and energy storage execution stations according to cities and dispatching authorities; arrange load control sub-stations and energy storage control sub-stations according to provinces; and arrange direct current control sub-stations, pumped storage control sub-stations, and frequency defense control master stations according to partitioned power grids;

[0050] 2) The main part of the frequency expansion defense line is a three-layer architecture of decentralized response and additional centralized control system: direct current execution stations and pumped storage execution stations are decentralized execution stations, load control execution stations and load execution units jointly constitute decentralized execution station functions, energy storage control execution stations and energy storage control execution units jointly constitute decentralized execution station functions; direct current control sub-stations, pumped storage control sub-stations, load control sub-stations, and energy storage control sub-stations realize additional control sub-station functions; and frequency defense control master stations realize additional centralized control master station functions;

[0051] 3) DC execution station collects the information of converter bus voltage, DC transmission power, modulatable power, etc., and calculates the bus frequency; pumped storage execution station collects the voltage, current of pumped storage unit, pumped storage station bus voltage, and calculates the power of pumped storage unit and bus frequency; load execution unit collects the voltage, current of load line, line connected bus voltage, and calculates the line power and bus frequency, load execution unit acts as the action mechanism of load control execution station, load execution station collects line power and issues command to remove the line of execution unit; energy storage execution unit collects the voltage, current of energy storage battery, connected bus voltage, and calculates the energy storage power and bus frequency, energy storage control execution unit acts as the action mechanism of energy storage control execution station, energy storage execution station collects energy storage power and issues command to remove or modulate the battery power of execution unit; frequency action value Fs, delay setting value Ts and control quantity setting value Psi are set on the devices of DC control execution station, pumped storage control execution station, energy storage control execution station and load control execution station respectively; total control quantity setting value ∑Psj is set on the devices of DC control substation, pumped storage control substation, energy storage control substation and load control substation respectively;

[0052] 4) Frequency expansion defense line monitoring auxiliary function, deploy frequency defense online monitoring module on the side of the ground station to monitor the control quantity of load and energy storage in the frequency defense line under the jurisdiction of the ground station; deploy frequency defense online monitoring module on the side of the provincial station to monitor the control quantity of load and energy storage in the frequency defense line under the jurisdiction of the provincial station; deploy frequency defense online monitoring module on the side of the network station to monitor the control quantity of DC, pumped storage, load and energy storage under the jurisdiction of the network station.

[0053] Two, additional control flow of two-layer architecture, refer to Figure 4 .

[0054] 1) When the bus frequency fi of the execution station is not less than the frequency action value Fs, the bus frequency fi and the controllable quantity Pci of the station are sent to the control substation, the substation collects the controllable quantity data Pci of each execution station, and then sums the Pci of each execution station to obtain the total controllable quantity ∑Pcj, when the total controllable quantity ∑Pc is less than the total control quantity setting value ∑Psj of the substation, the main station reports the "controllable quantity insufficient" abnormal message to remind the operation and maintenance personnel;

[0055] 2) When the bus frequency fi of the execution station is less than the frequency action value Fs, the duration is greater than the delay setting value Ts, the execution station removes the line or performs power modulation according to the control quantity setting value Psi, and simultaneously sends the action time frequency value fai and the actual control quantity Pai;

[0056] 3) Control substation receives actual control amount of each execution station, then calculates the actual total control amount ∑Paj. When ∑Paj is less than total control amount ∑Psj, determine whether ∑Psj is less than total controllable amount ∑Pcj. When ∑Psj is less than ∑Pcj, the additional control amount calculated by the substation is (∑Psj-∑Paj). Otherwise, the additional control amount calculated by the substation is (∑Pcj-∑Paj). The substation sends the additional control amount to each execution station to implement the cut-off or modulation of power. When ∑Psj is greater than ∑Pcj, calculate the coordinated control amount ∑Ptj=∑Psj-∑Pcj.

[0057] Three, three-layer architecture additional control process, refer to Figure 5 .

[0058] 1) When the total control amount ∑Psj of the control substation is less than the controllable amount ∑Pcj of the substation, the substation calculates the controllable amount ∑Pkj=∑Pcj-∑Psj and sends it to the additional centralized control master station. Otherwise, set ∑Pkj to 0 and send it to the control master station. At the same time, the substation sends the coordinated control amount ∑Ptj calculated in step 2 to the additional centralized control master station.

[0059] 2) After receiving the coordinated control amount ∑Ptj, the additional centralized control master station performs additional control according to the order of direct current controllable amount ∑Pk1, energy storage controllable amount ∑Pk2, pumped storage controllable amount ∑Pk3, and load controllable amount ∑Pk4 sent by each resource control substation. If the coordinated control amount ∑Ptj is greater than the direct current controllable amount ∑Pk1, the direct current additional control amount ∑Pc1=∑Pk1. Otherwise, ∑Pc1=∑Ptj. If the controllable amount of direct current with priority 1 is not enough, if (∑Ptj-∑Pk1) is greater than the energy storage controllable amount ∑Pk2, the energy storage additional control amount ∑Pc2=∑Pk2. Otherwise, ∑Pc2=∑Ptj-∑Pk1. If the controllable amount of energy storage with priority 2 is not enough, if (∑Ptj-∑Pk1-∑Pk2) is greater than the pumped storage controllable amount ∑Pk3, the pumped storage additional control amount ∑Pc3=∑Pk3. Otherwise, ∑Pc3=∑Ptj-∑Pk1-∑Pk2. If the controllable amount of pumped storage with priority 3 is not enough, if (∑Ptj-∑Pk1-∑Pk2-∑Pk3) is greater than the load controllable amount ∑Pk4, the load additional control amount ∑Pc4=∑Pk4. Otherwise, ∑Pc4=∑Ptj-∑Pk1-∑Pk2-∑Pk3.

[0060] Four, system processing of device abnormalities, refer to Figure 6 .

[0061] 1) The substation detects that the execution station without strategy value has communication abnormalities, and subtracts the controllable amount Pci of the station from the total controllable amount ∑Pcj.

[0062] 2) Substation detects abnormal communication of the station with strategy setting, during the abnormal period, the default action of the station is complete cut-off, the total control value ∑Psj needs to subtract the cuttable amount Pci sent by the station; set the execution station channel pressure plate, when the on-site confirms that the execution station cannot act abnormally, exit the pressure plate at the substation side, and the total control value ∑Psj no longer subtracts the cuttable amount Pci sent by the station.

[0063] 3) Substation itself is abnormal, the execution station detects abnormal communication, and the execution station with strategy setting acts according to the set value; the execution station without strategy setting cannot receive the additional control command and will not act; the three-layer control master station defaults that the overall resources of the substation are uncontrollable, and does not include the resources under the substation into the unified control resource pool.

[0064] 4) Master station is abnormal, the substation performs addition according to step two, and step three is no longer implemented.

Claims

1. A frequency expansion defense line control system dispersing response to additional centralized control, characterized by, The hierarchical architecture includes establishing a decentralized response additional centralized control based on resource sites, wherein for a single resource site, a two-layer architecture including decentralized execution stations and additional control sub-stations, and for multiple cross-resource sites, a three-layer architecture of an additional centralized control master station for cross-resource coordination is added to the two-layer architecture; Communication is established between the decentralized execution stations and the additional control sub-stations and between the additional control sub-stations and the additional centralized control master station for data interaction; The decentralized execution station includes collecting bus voltage to calculate bus frequency fi, collecting resource electrical quantity to calculate electrical power, and presetting execution station frequency action value Fs, delay constant value Ts, and control quantity constant value Psi; when the bus frequency fi is not less than the frequency action value Fs, the decentralized execution station uploads the bus frequency fi and controllable quantity Pci of the station to the additional control sub-station in real time; when the bus frequency fi is less than the frequency action value Fs and the duration is greater than the delay constant value Ts, the decentralized execution station performs cut-off or power modulation on the controllable resource according to the control quantity constant value Psi, and uploads the action time frequency value fai and the actual control quantity Pai to the additional control sub-station; wherein i represents the serial number of the decentralized execution station; The additional control sub-station is preset with a sub-station frequency action value and a total control quantity constant value ∑Psj; The additional control sub-station sums up the total controllable quantity ∑Pcj of all decentralized execution stations based on the controllable quantity Pci uploaded by the decentralized execution station i, and reports an "insufficient controllable quantity" exception message when the total controllable quantity ∑Pcj is less than the sub-station total control quantity constant value ∑Psj; The additional control sub-station sums up the actual total control quantity ∑Paj of all decentralized execution stations based on the actual control quantity Pai uploaded by the decentralized execution station i, and further judges whether the sub-station total control quantity constant value ∑Psj is less than the total controllable quantity ∑Pcj when the actual total control quantity ∑Paj is less than the total control quantity constant value ∑Psj; if ∑Psj is less than ∑Pcj, the additional control sub-station adds (∑Psj-∑Paj) control quantity to the decentralized execution station under its jurisdiction and performs cut-off or power modulation on the controllable resource; if ∑Psj is not less than ∑Pcj, the additional control sub-station adds (∑Pcj-∑Paj) control quantity to the decentralized execution station under its jurisdiction and performs cut-off or power modulation on the controllable resource; wherein j represents the serial number of the additional control sub-station.

2. The frequency extension defense control system of claim 1, wherein, For the three-layer architecture, when the additional control sub-station j total control quantity constant value ∑Psj is less than the total controllable quantity ∑Pcj, the additional control sub-station j calculates the coordinatable control quantity ∑Pkj=∑Pcj-∑Psj of the station and uploads it to the additional centralized control master station; otherwise, ∑Pkj is set to 0 and uploaded to the additional centralized control master station; When the additional control sub-station j total control quantity constant value ∑Psj is greater than the total controllable quantity ∑Pcj, the additional control sub-station j performs additional control to the decentralized execution station under its jurisdiction while calculating the coordinatable control quantity ∑Ptj=∑Psj-∑Pcj of the station and uploading it to the additional centralized control master station.

3. The frequency expansion defense control system of claim 2, wherein The additional centralized control master station sends the additional control substation j's need-coordinated control amount ∑Ptj to other additional control substations according to the coordinated control amount sent by other resource sites, and the additional control substation j's need-coordinated control amount ∑Ptj is sent to other additional control substations according to the preset resource control priority, and the execution stations under the other additional control substations execute the cutting or power modulation of the controllable resources.

4. The frequency extension defense control system of claim 1, wherein, The system is hierarchically deployed with online monitoring modules according to the province, the network, and the real-time monitoring of the controllable resources and the state of the additional centralized control master station, the additional control substation and the dispersed execution station within the scope of the dispatching authority.

5. The frequency extension defense control system of claim 4, wherein, The method for the online monitoring module to monitor the controllable resources and the state of the additional centralized control master station, the additional control substation and the dispersed execution station within the scope of the dispatching authority in real time is: When the additional control substation detects that the dispersed execution station under its jurisdiction has no strategy setting value and the communication is abnormal, the controllable amount of the dispersed execution station is excluded; When the additional control substation detects that the dispersed execution station under its jurisdiction has a strategy setting value and the communication is abnormal, the action amount of the dispersed execution station is set as the complete cutting during the abnormal period, the total control amount setting value of the additional control substation is reduced by the cuttable amount sent by the dispersed execution station, and the dispersed execution station channel pressure plate is set; when the dispersed execution station cannot act after the communication is abnormal, the additional control substation exits the dispersed execution station channel pressure plate with the communication abnormality, and the total control amount setting value of the additional control substation is no longer reduced by the cuttable amount sent by the station; When the additional control substation is abnormal, the dispersed execution station detects the communication abnormality, the dispersed execution station with the strategy setting value acts according to the setting value, the dispersed execution station without the strategy setting value cannot receive the command and does not act, and the additional centralized control master station defaults that the overall resources of the abnormal additional control substation are uncontrollable, and does not include the resources under the jurisdiction of the additional control substation into the unified control resource pool; When the additional centralized control master station is abnormal, each additional control substation adds according to the need-cutting amount setting value, and does not send the additional centralized control master station when the control amount is not enough.

6. A control method of a frequency expansion defense line control system based on the distributed response additional centralized control according to any one of claims 1 to 5, characterized by, For a single resource site, the dispersed execution station in the two-layer architecture monitors the bus frequency, when the bus frequency is higher than the set frequency action value, the dispersed execution station reports the controllable amount to the additional control substation, the additional control substation judges whether the total controllable amount of all dispersed execution stations meets the demand, if not, the additional control substation will send an abnormal message, when the bus frequency is lower than the frequency action value and the duration exceeds the set value, the dispersed execution station will directly control the controllable resources and report the actual control amount to the additional control substation, if the total control amount of all dispersed execution stations is not enough, the additional control substation adds control amount to the dispersed execution station; For multiple cross-resource sites, when the total control amount setting value of the additional control substation is less than the total controllable amount, the coordinated control amount is calculated and reported to the additional centralized control master station; Conversely, if the total control amount setting value is greater than the total controllable amount, the need-coordinated control amount is calculated and reported to the additional centralized control master station, the additional centralized control master station coordinates the control amount of the additional control substation of each resource site according to the information reported by each additional control substation, and realizes the resource optimization and control across sites.

7. The frequency extension defense control method of claim 6, wherein, The control method of the two-layer architecture is specifically: (1) When the bus frequency fi calculated by the distributed execution station i is not less than the frequency action value Fs, the distributed execution station i uploads the bus frequency fi and the controllable amount Pci to the additional control substation in real time; The additional control substation sums up the total controllable amount ∑Pcj of all distributed execution stations based on the controllable amount Pci uploaded by the distributed execution station i, and reports an "insufficient controllable amount" exception message when the total controllable amount ∑Pcj is less than the total control amount setting value ∑Psj of the substation; (2) When the bus frequency fi calculated by the distributed execution station i is less than the frequency action value Fs and the duration is greater than the delay setting value Ts, the distributed execution station i performs shedding or power modulation on the controllable resource according to the control amount setting value Psi, and uploads the action time frequency value fai and the actual control amount Pai to the additional control substation; The additional control substation sums up the actual total control amount ∑Paj of all distributed execution stations based on the actual control amount Pai uploaded by the distributed execution station i, and further judges whether the total control amount setting value ∑Psj of the substation is less than the total controllable amount ∑Pcj when the actual total control amount ∑Paj is less than the total control amount setting value ∑Psj, if ∑Psj is less than ∑Pcj, the additional control substation adds (∑Psj-∑Paj) control amount to the distributed execution station under its jurisdiction, and performs shedding or power modulation on the controllable resource, if ∑Psj is not less than ∑Pcj, the additional control substation adds (∑Pcj-∑Paj) control amount to the distributed execution station under its jurisdiction, and performs shedding or power modulation on the controllable resource; wherein i represents the serial number of the distributed execution station, and j represents the additional control substation.

8. The frequency extension defense control method of claim 7, wherein, The control method of the three-layer architecture is specifically: (1) When the bus frequency fi calculated by the distributed execution station i is not less than the frequency action value Fs, the distributed execution station i uploads the bus frequency fi and the controllable amount Pci to the additional control substation j in real time; The additional control substation j sums up the total controllable amount ∑Pcj of all distributed execution stations under its jurisdiction based on the controllable amount Pci uploaded by the distributed execution station i, and reports an "insufficient controllable amount" exception message when the total controllable amount ∑Pcj is less than the total control amount setting value ∑Psj of the substation; (2) When the bus frequency fi calculated by the distributed execution station i is less than the frequency action value Fs and the duration is greater than the delay setting value Ts, the distributed execution station i performs shedding or power modulation on the controllable resource according to the control amount setting value Psi, and uploads the action time frequency value fai and the actual control amount Pai to the additional control substation j; The additional control substation j obtains the actual total control amount ∑Paj of all the distributed execution stations under its jurisdiction based on the actual control amount Pai sent by the distributed execution station i, and when the actual total control amount ∑Paj is less than the total control amount set value ∑Psj, it is further determined whether the total control amount set value ∑Psj is less than the total controllable amount ∑Pcj. If ∑Psj is less than ∑Pcj, the additional control substation j adds (∑Psj-∑Paj) control amount to the distributed execution stations under its jurisdiction, and performs the cutting or power modulation of the controllable resources. If ∑Psj is not less than ∑Pcj, the additional control substation j adds (∑Pcj-∑Paj) control amount to the distributed execution stations under its jurisdiction, and performs the cutting or power modulation of the controllable resources; When the total control amount set value ∑Psj of the additional control substation j is less than the total controllable amount ∑Pcj, the additional control substation j calculates the coordinatable control amount ∑Pkj=∑Pcj-∑Psj of the station, and sends it to the additional centralized control master station. Otherwise, ∑Pkj is set to 0 and sent to the additional centralized control master station; When the total control amount set value ∑Psj of the additional control substation j is greater than the total controllable amount ∑Pcj, the additional control substation j performs additional control to the distributed execution stations under its jurisdiction, and calculates the coordination control amount ∑Ptj=∑Psj-∑Pcj of the station, and sends it to the additional centralized control master station; The additional centralized control master station sends the coordination control amount ∑Ptj of the additional control substation j based on the coordination control amount ∑Ptj sent by the additional control substation j, according to the coordinatable control amount sent by the additional control substation of other resource stations, and gives the additional control substation of other resource stations according to the pre-set resource control priority, and the execution station under the additional control substation of other resource stations executes the cutting or power modulation of the controllable resources; Wherein, i represents the serial number of the distributed execution station, and j represents the serial number of the additional control substation.

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