Power switching methods and switching devices in integrated power generation, grid, load and energy storage industrial parks

Abstract

This application provides a method and device for switching power sources within an integrated power generation, grid, load, and energy storage industrial park. The switching method includes: establishing a simulation model of the transient state of the power grid in the integrated power generation, grid, load, and energy storage industrial park; simulating fault tripping of the industrial park's production load under different operating conditions in the simulation model, obtaining multi-level bus phase angle difference characteristic curves and multi-level bus frequency difference characteristic curves; when any one of the multiple buses experiences a power outage, determining the target power switching device for switching the corresponding switching switch of that bus in the simulation model based on multi-level bus fast switching logic; determining the target fault switching mode used by the target power switching device from a preset fault switching mode according to the power fast switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode. This method and device improve the success rate of fast power switching within the integrated power generation, grid, load, and energy storage industrial park.

Description

Technical Field

[0001] This application relates to the field of power system technology, and more specifically, to a method and device for switching power sources within an integrated power generation, grid, load, and storage industrial park. Background Technology

[0002] With the national energy transition and the "dual carbon" goal requiring the power industry to accelerate the construction of a new power system based on new energy sources, industrial park power grids have become part of this new power system. Industrial parks are facing green transformation and upgrading; those with their own power plants need to allocate a certain proportion of distributed energy sources such as wind power, photovoltaics, and energy storage. This has changed the traditional power supply structure of industrial parks, and the industrial park power grid is developing into a new type of power system characterized by strong nonlinearity, multiple time scales, high-dimensional multi-coupling, and dynamic system features.

[0003] On the other hand, the loads in industrial parks (electrolytic aluminum, ferroalloys, electric arc furnaces, etc.) are mostly high-energy-consuming loads, with a high proportion of loads and complex characteristics. With the widespread participation of energy storage systems in peak shaving and valley filling, and rapid frequency regulation, as well as the frequent fluctuations in loads caused by the access of renewable energy sources with strong randomness and volatility, power outages of primary and secondary important loads can easily cause significant economic losses. However, the current control methods for energy storage in industrial parks are simplistic and cannot be adjusted in a timely manner under large disturbances. If the reliability of power supply to important loads and the stability of bus voltage cannot be guaranteed, it may cause significant economic losses.

[0004] Rapid switching of backup power or operating bus power is a crucial measure to ensure power supply to critical loads and plays an increasingly important role in the coordinated operation of power generation, grid, load, and storage in industrial parks. When a fault occurs in the internal power grid of an industrial park, causing a loss of power to the working section bus, the rapid power switching device adopts an emergency power switching mode to switch the backup power or operating bus power to the lost-power bus. Based on the switching speed of the backup power, it can be classified into rapid switching, leading phase angle switching (synchronous capture switching), and residual voltage switching, all of which utilize the voltage difference, phase angle difference, and frequency difference characteristics between the backup power or operating bus voltage and the residual voltage of the lost-power bus for voltage switching. Rapid power switching is a very important electrical operation in the stages of plant power start-up and shutdown, load switching, rapid power control of energy storage converters, and fault handling. Improving the success rate of rapid power switching is of great significance to the stable production and safe operation of large enterprises in industrial parks. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a method and device for switching power sources in an integrated power generation, grid, load and energy storage industrial park, which improves the success rate of synchronous closing of switches and thus improves the success rate of rapid power switching in the integrated power generation, grid, load and energy storage industrial park.

[0006] In a first aspect, embodiments of this application provide a method for switching power sources within an integrated power generation, grid, load, and energy storage industrial park, the switching method comprising:

[0007] Based on the load distribution, load type, energy storage control system, and actual parameters of the industrial park, a simulation model of the transient state of the power grid in the integrated power generation, grid, load, and storage industrial park is established. The simulation model includes generators, energy storage power stations, substation buses, multiple buses of different voltage levels, power switching devices corresponding to each bus, switching switches controlled by each power switching device, and a comprehensive load model.

[0008] Based on the comprehensive load model and the primary architecture of the industrial park power grid, the simulation model simulates the accident tripping of the industrial park's production load under different operating conditions, tests the transient response characteristics of rapid switching of power supply on each bus, and obtains the phase angle difference characteristic curve and the frequency difference characteristic curve of the multi-level bus.

[0009] When any one of the multiple busbars experiences a power outage, the target power switching device for switching the corresponding switching switch of that busbar is determined in the simulation model based on the multi-level busbar fast switching logic.

[0010] The power supply fast switching settings are determined based on the preset fault switching mode, the phase angle difference characteristic curve of the multi-level bus, and the frequency difference characteristic curve of the multi-level bus; wherein, the power supply fast switching settings include fast switching start delay, fast switching phase angle difference setting, fast switching frequency difference setting, leading phase angle difference setting, and leading frequency difference setting; and the preset fault switching mode includes fast switching mode and leading switching mode.

[0011] The target fault switching mode used by the target power switching device is determined from the preset fault switching modes according to the power rapid switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

[0012] Furthermore, the multi-level bus fast switching logic determines the target power switching device for switching the corresponding switching switch of the bus in the simulation model, including:

[0013] In the simulation model, the power switching device for controlling the switching switch connected to the bus is determined.

[0014] In the simulation model, the next-level bus located one level below the bus is determined, and the next-level power switching device for controlling the switching switch connected to the next-level bus is determined.

[0015] The current-level power switching device and the next-level power switching device are identified as the target power switching device.

[0016] Furthermore, the successful switching conditions corresponding to the fast switching mode are that the frequency difference is less than 2Hz and the closing time of the backup power supply is less than 50 milliseconds.

[0017] The successful switching condition for the advanced switching mode is that the frequency difference is less than 5Hz, and the closing time of the backup power supply is greater than 50 milliseconds and less than 200 milliseconds.

[0018] Furthermore, the fast switching angle difference setting and fast switching frequency difference setting in the power supply fast switching settings are determined through the following steps based on the fast switching mode:

[0019] Based on the multi-stage bus frequency difference characteristic curve, determine the intersection point between the 50ms position on the horizontal axis and the multi-stage bus frequency difference characteristic curve;

[0020] If the frequency difference at the crossover point is less than 2Hz, then the fast cut-off critical point is the crossover point, and the fast cut-off frequency difference is set to the frequency difference corresponding to the crossover point.

[0021] If the frequency difference at the intersection point is greater than 2Hz, then the fast cut-off critical point is the intersection point between the 2Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the fast cut-off frequency difference is set to the frequency difference corresponding to the fast cut-off critical point.

[0022] Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the fast cut-off critical point is determined, and the minimum phase angle difference is determined as the fast cut-off angle difference setpoint.

[0023] Furthermore, the leading angle difference setting and leading frequency difference setting in the power supply fast switching setting are determined according to the leading switching mode through the following steps:

[0024] Based on the frequency difference characteristic curve of the multi-stage bus, the intersection point between the horizontal coordinate 200ms position and the frequency difference characteristic curve of the multi-stage bus is obtained;

[0025] If the crossover frequency difference is less than 5Hz, then the leading critical point is the crossover point, and the leading frequency difference is defined as the frequency difference corresponding to the crossover point.

[0026] If the frequency difference at the intersection point is greater than 5Hz, then the leading critical point is the intersection point between the 5Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the leading frequency difference is defined as the frequency difference corresponding to the leading critical point.

[0027] Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the leading critical point is obtained, and the minimum phase angle difference is determined as the leading angle difference setpoint.

[0028] Furthermore, the fast switching start-up delay in the power fast switching setting is determined through the following steps:

[0029] In the multi-stage bus phase angle difference characteristic curve, the transient drop recovery point is determined based on the fast cut angle difference setpoint and the angle difference curve;

[0030] The horizontal coordinate value corresponding to the transient drop recovery point in the multi-stage bus phase angle difference characteristic curve is determined as the fast switching start delay.

[0031] Furthermore, determining the target fault switching mode from the preset fault switching modes based on the power rapid switching setting includes:

[0032] Obtain the current angle difference value and current frequency difference value of the bus corresponding to the target power switching device;

[0033] When the current frequency difference value is less than or equal to the leading angle difference set value, and the current angle difference value is less than or equal to the leading frequency difference set value, then the leading switching mode is determined as the target accident switching mode.

[0034] When the current frequency difference value is less than or equal to the fast cut angle difference setpoint, and the current angle difference value is less than or equal to the fast cut angle difference setpoint, then the fast switching mode is determined as the target accident switching mode.

[0035] Secondly, embodiments of this application also provide a power switching device for an integrated power generation, grid, load, and energy storage industrial park, the switching device comprising:

[0036] The model building module is used to establish a simulation model of the transient state of the power grid of the integrated power generation, grid, load and storage industrial park based on the load distribution, load type, energy storage control system and actual parameters of the industrial park. The simulation model includes generators, energy storage power stations, substation buses, multiple buses of different voltage levels, power switching devices corresponding to each bus, switching switches controlled by each power switching device and a comprehensive load model.

[0037] The characteristic curve determination module is used to simulate the production load of the industrial park under different operating conditions in the simulation model based on the comprehensive load model and the primary architecture of the industrial park power grid, test the transient response characteristics of the rapid switching of power supply of each bus, and obtain the phase angle difference characteristic curve and the frequency difference characteristic curve of the multi-level bus.

[0038] The target power switching device determination module is used to determine the target power switching device for switching the corresponding switching switch of any one of the multiple buses when the incoming power supply of any one of the buses fails. This is based on the multi-level bus fast switching logic in the simulation model.

[0039] The power supply fast switching setting determination module is used to determine the power supply fast switching setting based on the preset fault switching mode, the phase angle difference characteristic curve of the multi-stage bus, and the frequency difference characteristic curve of the multi-stage bus; wherein, the power supply fast switching setting includes fast switching start delay, fast switching angle difference setting, fast switching frequency difference setting, advance angle difference setting, and advance frequency difference setting, and the preset fault switching mode includes fast switching mode and advance switching mode;

[0040] The target fault switching mode determination module is used to determine the target fault switching mode used by the target power switching device from the preset fault switching modes according to the power rapid switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

[0041] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the power switching method in the integrated power source-grid-load-storage industrial park described above are performed.

[0042] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the power switching method in the integrated power source-grid-load-storage industrial park as described above.

[0043] Compared with existing technologies, the power switching method for integrated power generation, grid, load, and energy storage in industrial parks provided by this invention achieves the following beneficial effects: 1. Due to the large proportion of motor loads in industrial park production enterprises, the residual voltage amplitude of the busbar decreases slowly after a fault due to the inertia of industrial loads and the support of the energy storage system for transient voltages, providing short-term support. However, the accelerated phase angle change rate reduces the success rate of synchronous closing at the bus tie switch in existing power switching technologies. The synchronous start-up multi-stage busbar fast switching function provided in this application improves the success rate of synchronous switch closing. 2. This application uses measured parameters combined with equivalent circuit methods. Based on the start-up and operation characteristics of the energy storage control system participating in various loads such as electrolytic aluminum production lines, chemical production lines, fans, and pumps, a comprehensive load model is established. This model differs from typical models or classical parameter modeling and can accurately simulate the operation and control characteristics of actual industrial loads during power switching. The multi-stage busbar fast switching settings are adjusted according to the bus angle difference and frequency difference characteristic curves of different voltage levels, which has engineering application guidance significance.

[0044] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A flowchart illustrating a power switching method within an integrated power generation, grid, load, and energy storage industrial park, as provided in this application embodiment;

[0047] Figure 2 A schematic diagram of an integrated power generation, grid, load and storage industrial park primary electrical system provided in this application embodiment;

[0048] Figure 3 This is a schematic diagram of a comprehensive load model for an industrial park provided in an embodiment of this application;

[0049] Figure 4 A schematic diagram of a multi-stage bus phase angle difference characteristic curve provided in an embodiment of this application;

[0050] Figure 5 A schematic diagram of a multi-stage bus frequency difference characteristic curve provided in an embodiment of this application;

[0051] Figure 6 A comparison chart of the power switching success rate of industrial park production loads provided in the embodiments of this application;

[0052] Figure 7 A schematic diagram of the structure of a power switching device in an integrated power generation, grid, load and storage industrial park provided in this application embodiment;

[0053] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0055] First, the applicable scenarios for this application will be introduced. This application can be applied to the field of power system technology.

[0056] With the national energy transition and the "dual carbon" goal requiring the power industry to accelerate the construction of a new power system based on new energy sources, industrial park power grids have become part of this new power system. Industrial parks are facing green transformation and upgrading; those with their own power plants need to allocate a certain proportion of distributed energy sources such as wind power, photovoltaics, and energy storage. This has changed the traditional power supply structure of industrial parks, and the industrial park power grid is developing into a new type of power system characterized by strong nonlinearity, multiple time scales, high-dimensional multi-coupling, and dynamic system features.

[0057] On the other hand, the loads in industrial parks (electrolytic aluminum, ferroalloys, electric arc furnaces, etc.) are mostly high-energy-consuming loads, with a high proportion of loads and complex characteristics. With the widespread participation of energy storage systems in peak shaving and valley filling, and rapid frequency regulation, as well as the frequent fluctuations in loads caused by the access of renewable energy sources with strong randomness and volatility, power outages of primary and secondary important loads can easily cause significant economic losses. However, the current control methods for energy storage in industrial parks are simplistic and cannot be adjusted in a timely manner under large disturbances. If the reliability of power supply to important loads and the stability of bus voltage cannot be guaranteed, it may cause significant economic losses.

[0058] Research has shown that rapid switching of backup power or operating bus power is a crucial measure for ensuring power supply to critical loads and plays an increasingly important role in the coordinated operation of power generation, grid, load, and storage in industrial parks. When a fault occurs in the internal power grid of an industrial park, causing a loss of power to the working section bus, the rapid power switching device adopts an emergency power switching method to switch the backup power or operating bus power to the de-energized bus. Based on the switching speed of the backup power, it can be classified into rapid switching, leading phase angle switching (synchronous capture switching), and residual voltage switching, all of which utilize the voltage difference, phase angle difference, and frequency difference characteristics between the backup power or operating bus voltage and the residual voltage of the de-energized bus for voltage switching. Rapid power switching is a very important electrical operation in the stages of plant power start-up and shutdown, load switching, rapid power control of energy storage converters, and fault handling. Improving the success rate of rapid power switching is of great significance to the stable production and safe operation of large enterprises in industrial parks.

[0059] Based on this, this application provides a method for switching power sources within an integrated power generation, grid, load, and energy storage industrial park, in order to improve the success rate of rapid power switching within the integrated power generation, grid, load, and energy storage industrial park.

[0060] Please see Figure 1 , Figure 1 This is a flowchart illustrating a power switching method within an integrated power generation, grid, load, and energy storage industrial park, as provided in an embodiment of this application. Figure 1 As shown in the embodiment of this application, the power switching method within an integrated power generation, grid, load, and energy storage industrial park includes:

[0061] S101. Based on the load distribution, load type, energy storage control system, and actual parameters of the industrial park, a simulation model of the transient state of the power grid in the integrated power generation, grid, load, and storage industrial park is established.

[0062] Here, the simulation model includes generators, energy storage power stations, substation busbars, multiple busbars of different voltage levels in the industrial park, power switching devices corresponding to each busbar, switching switches controlled by each power switching device, and a comprehensive load model. For example... Figure 2 The above, Figure 2 This is a schematic diagram of an integrated power generation, grid, load, and energy storage primary electrical system for an industrial park, provided as an embodiment of this application. Figure 2 As shown, taking an actual integrated industrial park of power generation, grid, load and storage as an example, the energy storage power station is connected to the 220kV bus. Two power fast switching devices are configured on the 110kV bus side to control switch 112. Four power fast switching devices are configured on the 35kV bus side to control switches 312 and 334 respectively. Four power fast switching devices are configured on the 10kV bus side to control switches 912 and 934 respectively.

[0063] According to the embodiments provided in this application, in specific implementation, the system modeling is mainly based on the real-time digital simulation software RTDS and BPA software. The internal power grid parameters of the industrial park are based on the line parameters, main transformer parameters and power flow data under normal operating conditions provided by the industrial park. The external power grid parameters are calculated based on the electromechanical transient to obtain the equivalent impedance of the system. The energy storage power station parameters are built based on the energy storage system control model.

[0064] The simulation modeling of the chemical load area adopts a comprehensive load model, namely a combined model of electric motors, constant impedance devices, and reactive power compensation devices. The proportion and parameters of each type are determined based on the load parameters provided by the industrial park. Please refer to [link / reference needed]. Figure 3 , Figure 3 This is a schematic diagram of a comprehensive load model for an industrial park provided in an embodiment of this application. The combined model of constant impedance and reactive power compensation device is as follows: Figure 3 As shown in the lower center, the constant impedance and reactive power compensation capacity are controlled by dynamically adjusting the active power injection point Psetload11 and the reactive power injection point Qsetload11 of the dynamic load. The primary system model of the motor is as follows. Figure 3 As shown in the upper center, this includes loads with square torque characteristics, constant torque characteristics, and constant power characteristics. The industrial park motor control model has constant speed and constant torque control modes, and the control compiler card is shown on the right side of the figure. The constant speed and constant torque control mode switching switch INDM11 is controlled by the circuit breaker contact signal, as shown below. Figure 3 As shown in the lower left corner. The speed control signal INDS11 and the torque control signal INDT11 are controlled by the contact signals of the speed and torque control models, as follows: Figure 3 As shown in the upper left, the simulation parameters of the control model are determined by the equivalent circuit of the motor and the measured parameters on site.

[0065] Regarding step S101 above, in specific implementation, a simulation model of the transient state of the power grid in the industrial park integrating source, grid, load and storage is established based on the load distribution, load type, energy storage control system and actual parameters of the industrial park.

[0066] S102, Based on the comprehensive load model and the primary architecture of the industrial park power grid, the simulation model is used to simulate the accident tripping of the industrial park's production load under different operating conditions, test the transient response characteristics of the rapid switching of power supply of each bus, and obtain the phase angle difference characteristic curve and the frequency difference characteristic curve of the multi-level bus.

[0067] It should be noted that the phase angle difference characteristic curve refers to the relationship between the phase angle difference of each bus and time, while the frequency difference characteristic curve refers to the relationship between the frequency difference of each bus and time.

[0068] Regarding step S102 above, in specific implementation, after obtaining the comprehensive load model based on measured parameters, RTDS real-time simulation is used to simulate the fault tripping of the industrial park's production load under different operating conditions. For example, fault tripping simulation can include 110kV line and transformer N-1 tripping, 35kV line and transformer N-1 tripping, etc. Figure 2 A schematic diagram of a medium-short circuit fault. After performing a fault trip simulation, the phase angle difference characteristic curve and frequency difference characteristic curve of each voltage level bus can be obtained based on the electromagnetic transient waveforms of each bus in the fault trip simulation. Please refer to [link / reference]. Figure 4 , Figure 4 Please refer to the schematic diagram of a multi-stage bus phase angle difference characteristic curve provided in the embodiments of this application. Figure 5 , Figure 5 This is a schematic diagram of a multi-stage bus frequency difference characteristic curve provided in an embodiment of this application. Multiple tests were conducted, and based on the statistical and clustering results of phase angle difference and frequency difference, the bus voltage analysis results for four types of load conditions were obtained: the voltage characteristic curve of a 110kV bus with a load rate of 80% (…). Figure 4 Phase angle difference 110kV L80% curve and Figure 5 Voltage characteristic curve of a 35kV bus with a load rate of 40% and a frequency difference of 110kV bus. Figure 4 Phase angle difference 35kV L40% and Figure 5 The voltage characteristic curve of a 35kV bus with a frequency difference of 35kV, where the load rate of the 35kV bus is 80% and the motor load accounts for 70%. Figure 4 Phase angle difference 35kV M70% and Figure 5 Voltage characteristic curve of 35kV bus with a frequency difference of 35kV, where the load rate of the 35kV bus is 80% and the motor load accounts for 90% ( Figure 4 Phase angle difference 35kV M90% and Figure 5 Frequency difference 35kV bus).

[0069] S103, when any one of the multiple buses experiences a power outage, the target power switching device for switching the corresponding switching switch of that bus is determined in the simulation model based on the multi-level bus fast switching logic.

[0070] It should be noted that the target power switching device refers to the device used to control the switching switch. The multi-stage busbar fast switching logic refers to the pre-set switching logic used to determine the power switching device to be activated when an incoming power supply failure occurs. Here, according to the embodiment provided in this application, the multi-stage busbar fast switching logic is as follows: when a fault trips the current stage busbar, the fast switching device not only initiates the closing of the current stage bus tie switch or sectionalizing switch, but also initiates the next stage fast switching action to close the bus tie or sectionalizing switch. As an example, such as... Figure 2As shown, after the 110kV busbar incoming power supply fails, the 110kV power supply fast switching device and the 35kV power supply fast switching device are activated simultaneously; after the 35kV busbar incoming power supply fails, the 35kV power supply fast switching device and the 10kV power supply fast switching device are activated simultaneously.

[0071] Regarding step S103 above, in specific implementation, when any one of the multiple busbars experiences a loss of incoming power, the target power switching device for switching the corresponding switching switch of that busbar is determined in the simulation model based on the multi-level busbar fast switching logic.

[0072] Furthermore, regarding step S103 above, the method for determining the target power switching device for switching the corresponding switching switch of the bus based on the multi-level bus fast switching logic in the simulation model includes:

[0073] Step 1031: In the simulation model, determine the local power switching device used to control the switching switch connected to the bus.

[0074] Step 1032: In the simulation model, determine the next-level bus located one level below the bus, and determine the next-level power switching device for controlling the switching switch connected to the next-level bus.

[0075] Step 1033: The current power switching device and the next-level power switching device are identified as the target power switching device.

[0076] It should be noted that the power switching device at this level refers to the power switching device that controls the switching switches connected to this bus. The next-level bus refers to the bus with a voltage level one level below this bus, for example, such as... Figure 2 As shown, this busbar is a 110kV busbar, and the next-level busbar is a 35kV busbar. The next-level power switching device is a power switching device that controls the switching switches connected to the next-level busbar.

[0077] Regarding steps 1031-1033 above, in specific implementation, firstly, the power switching device controlling the switching switch connected to the busbar is determined in the simulation model. For example, such as... Figure 2 As shown, when the busbar is a 110kV busbar, the switching device connected to this busbar is switch 112. Therefore, the power switching device controlling switch 112 is determined as the power switching device for this stage. Then, the next-level busbar located at this busbar is determined in the simulation model. Continuing with the above embodiment, the next-level busbar is a 35kV busbar. Then, the next-level power switching device used to control the switching device connected to the next-level busbar is determined. As an example, such as... Figure 2As shown, when the next-level busbar is a 35kV busbar, the switching devices connected to the next-level busbar are switch 312 and switch 334. Therefore, the power switching devices controlling switch 312 and switch 334 are determined as the next-level power switching devices. Finally, the current-level power switching device and the next-level power switching device are determined as the target power switching device.

[0078] S104, determine the power supply fast switching setpoint based on the preset fault switching mode, the phase angle difference characteristic curve of the multi-level bus, and the frequency difference characteristic curve of the multi-level bus.

[0079] Here, the power fast switching settings include fast switching start delay, fast switching angle difference setting, fast switching frequency difference setting, lead angle difference setting, and lead frequency difference setting. The preset fault switching modes include fast switching mode and lead switching mode.

[0080] Regarding step S104 above, in specific implementation, the power supply fast switching setting is determined based on the preset fault switching mode, the multi-level bus phase angle difference characteristic curve and the multi-level bus frequency difference characteristic curve determined in step S102.

[0081] This application employs the analysis and judgment method of the angle difference and frequency difference characteristic curves of multi-level busbars in industrial parks, and draws the following conclusions: Under the power rapid switching mode within 50ms, the success rate of rapid switching of the power supply to the upper-level busbar is greater than that of the lower-level busbar. The more load the busbar carries and the higher its load rate, the higher the success rate of rapid switching; the more motor loads the busbar carries, the higher the success rate of rapid switching. Under the power advanced switching mode within 200ms, the industrial park's production loads have only two synchronous capture points during power switching. The low-voltage busbar has a light load rate, meaning the power switching success rate is high when the busbar carries approximately 40% load. In summary, there is a risk of power switching failure when the load on the busbar is between 40% and 80%, and there is also a risk of power switching failure when the low-voltage busbar loses power. Therefore, the switching success conditions corresponding to the rapid switching mode are a frequency difference of less than 2Hz and a backup power supply closing time of less than 50 milliseconds. The successful switching conditions for the advanced switching mode are that the frequency difference is less than 5Hz and the closing time of the backup power supply is greater than 50 milliseconds and less than 200 milliseconds.

[0082] Furthermore, regarding step S104 above, the fast switching angle difference setting and fast switching frequency difference setting in the power supply fast switching settings are determined through the following steps based on the fast switching mode:

[0083] (1): Based on the frequency difference characteristic curve of the multi-stage bus, determine the intersection point between the horizontal coordinate 50ms position and the frequency difference characteristic curve of the multi-stage bus.

[0084] (2): If the frequency difference at the crossover point is less than 2Hz, then the fast cut-off critical point is the crossover point, and the fast cut-off frequency difference is the frequency difference corresponding to the crossover point.

[0085] (3): If the frequency difference at the intersection point is greater than 2Hz, then the fast cut critical point is the intersection point between the 2Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the fast cut frequency difference is set to the frequency difference corresponding to the fast cut critical point.

[0086] (4): Based on the phase angle difference characteristic curve of the multi-stage bus, determine the minimum phase angle difference of the voltage of the multi-stage bus at the fast cut-off critical point, and determine the minimum phase angle difference as the fast cut-off angle difference set value.

[0087] Regarding steps (1) to (4) above, in specific implementation, the first step is to determine the fast cut critical point A and the fast cut frequency difference constant Δθ. A For example, please refer to Figure 5 ,according to Figure 5 The frequency difference characteristic curve of the multi-stage bus is used to determine the intersection point of the horizontal axis at 50ms and the frequency difference curve. If the frequency difference at the intersection point is less than 2Hz, then the fast cutoff critical point A is this intersection point, and the fast cutoff frequency difference setpoint Δθ is used. A Let A be the crossover frequency difference; if the crossover frequency difference is greater than 2Hz, then the fast cutoff critical point A is the intersection of the 2Hz position on the vertical axis and the frequency difference curve, and the fast cutoff frequency difference is a constant value Δθ. A The frequency is 2Hz. The second step is to determine the fast cut angle difference setpoint Δf. A Please see. Figure 4 ,according to Figure 4 The multi-stage bus phase angle difference characteristic curves in the diagram are used to derive the minimum phase angle difference of the bus voltage at the fast cut-off critical point A under four types of load conditions, such as... Figure 4 If the dashed line phA represents the region of minimum phase angle difference, then the fast cut angle difference constant Δf is... A This is the minimum phase angle difference.

[0088] Furthermore, regarding step S104 above, the leading angle difference setpoint and leading frequency difference setpoint in the power supply fast switching setpoint are determined through the following steps based on the leading switching mode:

[0089] A: Based on the multi-stage bus frequency difference characteristic curve, the intersection point between the horizontal coordinate 200ms position and the multi-stage bus frequency difference characteristic curve is obtained;

[0090] B: If the crossover frequency difference is less than 5Hz, then the leading critical point is the crossover point, and the leading frequency difference is defined as the frequency difference corresponding to the crossover point;

[0091] C: If the frequency difference at the intersection point is greater than 5Hz, then the leading critical point is the intersection point between the 5Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the leading frequency difference is defined as the frequency difference corresponding to the leading critical point.

[0092] D: Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the leading critical point is obtained, and the minimum phase angle difference is determined as the leading angle difference setpoint.

[0093] Regarding steps A-D above, in practical implementation, the first step is to determine the leading critical point B and the leading frequency difference setpoint Δθ. B For example, please refer to Figure 5 ,according to Figure 5 The frequency difference characteristic curve of the multi-stage bus is used to determine the intersection point of the horizontal axis at 200ms and the frequency difference curve. If the frequency difference at the intersection point is less than 5Hz, then the leading critical point B is the intersection point, and the leading frequency difference is set to Δθ. B The crossover frequency difference is given by the following formula: If the crossover frequency difference is greater than 5Hz, then the leading critical point B is the intersection of the 5Hz position on the vertical axis and the frequency difference curve, and the leading frequency difference is set to Δθ. B The frequency is 5Hz. The second step is to determine the lead angle difference constant Δf. B Please see. Figure 4 ,according to Figure 4 The multi-stage bus phase angle difference characteristic curves in the diagram are used to derive the minimum phase angle difference of the bus voltage at the leading critical point B for four types of load conditions, such as... Figure 4 The dashed line phB represents the region of minimum phase angle difference; therefore, the leading angle difference constant Δf is given. B This is the minimum phase angle difference.

[0094] Furthermore, regarding step S104 above, the fast switching start-up delay in the power fast switching setting is determined through the following steps:

[0095] I: In the multi-stage bus phase angle difference characteristic curve, the transient drop recovery point is determined based on the fast cut angle difference setpoint and the angle difference curve.

[0096] II: The horizontal coordinate value corresponding to the transient drop recovery point in the multi-level bus phase angle difference characteristic curve is determined as the fast switching start delay.

[0097] Regarding steps I-II above, in practical implementation, firstly, the transient sag recovery point is determined in the multi-stage bus phase angle difference characteristic curve based on the fast-switching angle difference setpoint and the angle difference curve. Then, the horizontal coordinate value corresponding to the transient sag recovery point is determined as the fast-switching start-up delay. For an example, please refer to [link to example]. Figure 4 ,according to Figure 4The phase angle difference characteristic curve of the multi-stage busbars shows that, under load conditions greater than 70%, the phase angle difference of the low-voltage busbars exhibits a significant transient drop within 10ms after a fault, exceeding 50°. Therefore, for low-voltage fast-switching devices, a delay should be provided after receiving the fast-switching start signal from the upper level during a fault to mitigate the transient drop impact. The fast-start delay is the time of the transient drop recovery point, which is point C in the diagram. The position of point C is determined by the fast-switching angle difference setting Δf. A Determined by the angle difference curve.

[0098] In summary, based on the embodiments provided in this application, the fast cut frequency difference is set to 2Hz, the fast cut angle difference is set to 35°, the lead frequency difference is set to 5Hz, the lead angle difference is set to 20°, and the fast start delay is 6ms.

[0099] S105, determine the target fault switching mode used by the target power switching device from the preset fault switching modes according to the power rapid switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

[0100] It should be noted that the target fault handover mode refers to the mode required by the target power switching device when performing power switching. Here, the target fault handover mode is either a fast handover mode or a forward handover mode.

[0101] Regarding step S105 above, in specific implementation, the target fault switching mode used by the target power switching device is determined from the two preset fault switching modes based on the power rapid switching setting determined in step S104, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

[0102] Furthermore, regarding step S105 above, determining the target fault switching mode from the preset fault switching modes based on the power rapid switching setting includes:

[0103] Step 1051: Obtain the current angle difference value and the current frequency difference value of the bus corresponding to the target power switching device.

[0104] Step 1052: When the current frequency difference value is less than or equal to the leading angle difference set value, and the current angle difference value is less than or equal to the leading frequency difference set value, then the leading switching mode is determined as the target accident switching mode.

[0105] Step 1053: When the current frequency difference value is less than or equal to the fast cut angle difference setpoint, and the current angle difference value is less than or equal to the fast cut angle difference setpoint, then the fast switching mode is determined as the target accident switching mode.

[0106] Specifically, the leading handover mode requires that the current frequency difference value Δθ ≤ the leading angle difference setpoint, and the current angle difference value Δf ≤ the leading frequency difference setpoint. The fast handover mode requires that the current frequency difference value Δθ ≤ the fast handover angle difference setpoint, and the current angle difference value Δf ≤ the fast handover frequency difference setpoint.

[0107] Regarding steps 1051-1053 above, in specific implementation, firstly, the current angle difference value and current frequency difference value of the bus corresponding to the target power switching device are obtained. Then, the current angle difference value and current frequency difference value are compared with the power fast switching setting. If the current frequency difference value is less than or equal to the leading angle difference setting value in the power fast switching setting, and the current angle difference value is less than or equal to the leading frequency difference setting value in the power fast switching setting, then the leading switching mode is determined as the target fault switching mode. If the current frequency difference value is less than or equal to the fast switching angle difference setting value in the power fast switching setting, and the current angle difference value is less than or equal to the fast switching angle difference setting value in the power fast switching setting, then the fast switching mode is determined as the target fault switching mode.

[0108] Based on the power switching method for an integrated power generation, grid, load, and energy storage industrial park provided in this application, a hardware-in-the-loop simulation test platform for the power fast switching device was built, applying both traditional power fast switching technology and the power fast switching technology provided in this application. Dynamic model tests were conducted on power supply failures during production lines under different industrial loads within the industrial park. The success rates of the 110kV, 35kV, and 10kV power fast switching devices were statistically analyzed over 200 cycles. Finally, a comparison of the power switching success rates of the traditional fast switching technology and the fast switching technology of this application was plotted. Please refer to [link / reference]. Figure 6 , Figure 6 This is a comparison chart showing the success rate of rapid power switching for industrial park production loads, provided in an embodiment of this application. (See attached image.) Figure 6 As shown, this demonstrates the effectiveness and reliability of the synchronous start-up multi-level busbar fast switching method provided in this application, ensuring reliable power supply to critical loads in the industrial park.

[0109] Compared with existing technologies, the power switching method for integrated power generation, grid, load, and energy storage in industrial parks provided by this invention achieves the following beneficial effects: 1. Due to the large proportion of motor loads in industrial park production enterprises, the residual voltage amplitude of the busbar decreases slowly after a fault due to the inertia of industrial loads and the support of the energy storage system for transient voltages, providing short-term support. However, the accelerated phase angle change rate reduces the success rate of synchronous closing at the bus tie switch in existing power switching technologies. The synchronous start-up multi-stage busbar fast switching function provided in this application improves the success rate of synchronous switch closing. 2. This application uses measured parameters combined with equivalent circuit methods. Based on the start-up and operation characteristics of the energy storage control system participating in various loads such as electrolytic aluminum production lines, chemical production lines, fans, and pumps, a comprehensive load model is established. This model differs from typical models or classical parameter modeling and can accurately simulate the operation and control characteristics of actual industrial loads during power switching. The multi-stage busbar fast switching settings are adjusted according to the bus angle difference and frequency difference characteristic curves of different voltage levels, which has engineering application guidance significance.

[0110] Please see Figure 7 , Figure 7 This is a schematic diagram of a power switching device for an integrated power generation, grid, load, and energy storage industrial park, as provided in an embodiment of this application. Figure 7 As shown, the switching device 700 includes:

[0111] The model building module 701 is used to build a simulation model of the transient state of the power grid of the integrated power generation, grid, load and storage industrial park based on the load distribution, load type, energy storage control system and actual parameters of the industrial park; wherein, the simulation model includes generators, energy storage power stations, substation busbars, multiple busbars of different voltage levels, power switching devices corresponding to each busbar, switching switches controlled by each power switching device and a comprehensive load model.

[0112] The characteristic curve determination module 702 is used to simulate the accident tripping of the production load of the industrial park under different operating conditions in the simulation model based on the comprehensive load model and the primary architecture of the industrial park power grid, test the transient response characteristics of the rapid switching of power supply of each bus, and obtain the phase angle difference characteristic curve and the frequency difference characteristic curve of the multi-level bus.

[0113] The target power switching device determination module 703 is used to determine the target power switching device for switching the corresponding switching switch of the bus in the simulation model based on the multi-level bus fast switching logic when any one of the multiple buses experiences a loss of incoming power.

[0114] The power supply fast switching setting determination module 704 is used to determine the power supply fast switching setting based on the preset fault switching mode, the phase angle difference characteristic curve of the multi-stage bus, and the frequency difference characteristic curve of the multi-stage bus; wherein, the power supply fast switching setting includes fast switching start delay, fast switching angle difference setting, fast switching frequency difference setting, advance angle difference setting, and advance frequency difference setting, and the preset fault switching mode includes fast switching mode and advance switching mode;

[0115] The target fault switching mode determination module 705 is used to determine the target fault switching mode used by the target power switching device from the preset fault switching modes according to the power rapid switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

[0116] Furthermore, when the target power switching device determination module 703 determines the target power switching device for switching the switching switch corresponding to the bus in the simulation model based on the multi-level bus fast switching logic, the target power switching device determination module 703 is also used to: determine the power switching device of this level for controlling the switching switch connected to the bus in the simulation model.

[0117] In the simulation model, the next-level bus located one level below the bus is determined, and the next-level power switching device for controlling the switching switch connected to the next-level bus is determined.

[0118] The current-level power switching device and the next-level power switching device are identified as the target power switching device.

[0119] Furthermore, the successful switching conditions corresponding to the fast switching mode are that the frequency difference is less than 2Hz and the closing time of the backup power supply is less than 50 milliseconds.

[0120] The successful switching condition for the advanced switching mode is that the frequency difference is less than 5Hz, and the closing time of the backup power supply is greater than 50 milliseconds and less than 200 milliseconds.

[0121] Furthermore, the power fast switching setting determination module 704 is also used to determine the fast switching angle difference setting and the fast switching frequency difference setting in the power fast switching setting according to the fast switching mode through the following steps:

[0122] Based on the multi-stage bus frequency difference characteristic curve, determine the intersection point between the 50ms position on the horizontal axis and the multi-stage bus frequency difference characteristic curve;

[0123] If the frequency difference at the crossover point is less than 2Hz, then the fast cut-off critical point is the crossover point, and the fast cut-off frequency difference is set to the frequency difference corresponding to the crossover point.

[0124] If the frequency difference at the intersection point is greater than 2Hz, then the fast cut-off critical point is the intersection point between the 2Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the fast cut-off frequency difference is set to the frequency difference corresponding to the fast cut-off critical point.

[0125] Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the fast cut-off critical point is determined, and the minimum phase angle difference is determined as the fast cut-off angle difference setpoint.

[0126] Furthermore, the power fast switching setting determination module 704 is also used to determine the lead angle difference setting and the lead frequency difference setting in the power fast switching setting according to the lead switching mode through the following steps:

[0127] Based on the frequency difference characteristic curve of the multi-stage bus, the intersection point between the horizontal coordinate 200ms position and the frequency difference characteristic curve of the multi-stage bus is obtained;

[0128] If the crossover frequency difference is less than 5Hz, then the leading critical point is the crossover point, and the leading frequency difference is defined as the frequency difference corresponding to the crossover point.

[0129] If the frequency difference at the intersection point is greater than 5Hz, then the leading critical point is the intersection point between the 5Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the leading frequency difference is defined as the frequency difference corresponding to the leading critical point.

[0130] Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the leading critical point is obtained, and the minimum phase angle difference is determined as the leading angle difference setpoint.

[0131] Furthermore, the power fast switching setpoint determination module 704 is also used to determine the fast switching start delay in the power fast switching setpoint through the following steps:

[0132] In the multi-stage bus phase angle difference characteristic curve, the transient drop recovery point is determined based on the fast cut angle difference setpoint and the angle difference curve;

[0133] The horizontal coordinate value corresponding to the transient drop recovery point in the multi-stage bus phase angle difference characteristic curve is determined as the fast switching start delay.

[0134] Furthermore, when the target fault switching mode determination module 705 is used to determine the target fault switching mode from the preset fault switching modes based on the power supply fast switching setting, the target fault switching mode determination module 705 is also used to: obtain the current angle difference value and the current frequency difference value of the bus corresponding to the target power supply switching device.

[0135] When the current frequency difference value is less than or equal to the leading angle difference set value, and the current angle difference value is less than or equal to the leading frequency difference set value, then the leading switching mode is determined as the target accident switching mode.

[0136] When the current frequency difference value is less than or equal to the fast cut angle difference setpoint, and the current angle difference value is less than or equal to the fast cut angle difference setpoint, then the fast switching mode is determined as the target accident switching mode.

[0137] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 8 As shown, the electronic device 800 includes a processor 810, a memory 820, and a bus 830.

[0138] The memory 820 stores machine-readable instructions executable by the processor 810. When the electronic device 800 is running, the processor 810 and the memory 820 communicate via the bus 830. When the machine-readable instructions are executed by the processor 810, they can perform the operations described above. Figure 1 The specific implementation of the power switching method in the integrated power generation, grid, load and energy storage industrial park shown in the method embodiment can be found in the method embodiment, and will not be repeated here.

[0139] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 1 The specific implementation of the power switching method in the integrated power generation, grid, load and energy storage industrial park shown in the method embodiment can be found in the method embodiment, and will not be repeated here.

[0140] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0141] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0142] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0143] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0144] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0145] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0146] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for switching power sources within an integrated power generation, grid, load, and energy storage industrial park, characterized in that, The switching method includes: Based on the load distribution, load type, energy storage control system, and actual parameters of the industrial park, a simulation model of the transient state of the power grid in the integrated power generation, grid, load, and storage industrial park is established. The simulation model includes generators, energy storage power stations, substation buses, multiple buses of different voltage levels, power switching devices corresponding to each bus, switching switches controlled by each power switching device, and a comprehensive load model. Based on the comprehensive load model and the primary architecture of the industrial park power grid, the simulation model simulates the accident tripping of the industrial park's production load under different operating conditions, tests the transient response characteristics of rapid switching of power supply on each bus, and obtains the phase angle difference characteristic curve and the frequency difference characteristic curve of the multi-level bus. When any one of the multiple busbars experiences a power outage, the target power switching device for switching the corresponding switching switch of that busbar is determined in the simulation model based on the multi-level busbar fast switching logic. The power supply fast switching settings are determined based on the preset fault switching mode, the phase angle difference characteristic curve of the multi-level bus, and the frequency difference characteristic curve of the multi-level bus; wherein, the power supply fast switching settings include fast switching start delay, fast switching phase angle difference setting, fast switching frequency difference setting, leading phase angle difference setting, and leading frequency difference setting; and the preset fault switching mode includes fast switching mode and leading switching mode. The target fault switching mode used by the target power switching device is determined from the preset fault switching modes according to the power rapid switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

2. The switching method according to claim 1, characterized in that, The multi-level bus fast switching logic determines the target power switching device for switching the corresponding switching switch of the bus in the simulation model, including: In the simulation model, the power switching device for controlling the switching switch connected to the bus is determined. In the simulation model, the next-level bus located one level below the bus is determined, and the next-level power switching device for controlling the switching switch connected to the next-level bus is determined. The current-level power switching device and the next-level power switching device are identified as the target power switching device.

3. The switching method according to claim 1, characterized in that, The successful switching conditions for the fast switching mode are that the frequency difference is less than 2Hz and the closing time of the backup power supply is less than 50 milliseconds. The successful switching condition for the advanced switching mode is that the frequency difference is less than 5Hz, and the closing time of the backup power supply is greater than 50 milliseconds and less than 200 milliseconds.

4. The switching method according to claim 3, characterized in that, The fast switching angle difference setting and fast switching frequency difference setting in the power supply fast switching settings are determined by the following steps based on the fast switching mode: Based on the multi-stage bus frequency difference characteristic curve, determine the intersection point between the 50ms position on the horizontal axis and the multi-stage bus frequency difference characteristic curve; If the frequency difference at the crossover point is less than 2Hz, then the fast cut-off critical point is the crossover point, and the fast cut-off frequency difference is set to the frequency difference corresponding to the crossover point. If the frequency difference at the intersection point is greater than 2Hz, then the fast cut-off critical point is the intersection point between the 2Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the fast cut-off frequency difference is set to the frequency difference corresponding to the fast cut-off critical point. Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the fast cut-off critical point is determined, and the minimum phase angle difference is determined as the fast cut-off angle difference setpoint.

5. The switching method according to claim 3, characterized in that, The preceding angle difference setting and the preceding frequency difference setting in the power supply fast switching setting are determined by the following steps based on the preceding switching mode: Based on the frequency difference characteristic curve of the multi-stage bus, the intersection point between the horizontal coordinate 200ms position and the frequency difference characteristic curve of the multi-stage bus is obtained; If the crossover frequency difference is less than 5Hz, then the leading critical point is the crossover point, and the leading frequency difference is defined as the frequency difference corresponding to the crossover point. If the frequency difference at the intersection point is greater than 5Hz, then the leading critical point is the intersection point between the 5Hz position on the vertical axis and the frequency difference characteristic curve of the multi-stage bus, and the leading frequency difference is defined as the frequency difference corresponding to the leading critical point. Based on the phase angle difference characteristic curve of the multi-stage bus, the minimum phase angle difference of the voltage of the multiple buses at the leading critical point is obtained, and the minimum phase angle difference is determined as the leading angle difference setpoint.

6. The switching method according to claim 3, characterized in that, The fast switching start delay in the power fast switching setting is determined by the following steps: In the multi-stage bus phase angle difference characteristic curve, the transient drop recovery point is determined based on the fast cut angle difference setpoint and the angle difference curve; The horizontal coordinate value corresponding to the transient drop recovery point in the multi-stage bus phase angle difference characteristic curve is determined as the fast switching start delay.

7. The switching method according to claim 1, characterized in that, The step of determining the target fault switching mode from the preset fault switching modes based on the power rapid switching setpoint includes: Obtain the current angle difference value and current frequency difference value of the bus corresponding to the target power switching device; When the current frequency difference value is less than or equal to the leading angle difference set value, and the current angle difference value is less than or equal to the leading frequency difference set value, then the leading switching mode is determined as the target accident switching mode. When the current frequency difference value is less than or equal to the fast cut angle difference setpoint, and the current angle difference value is less than or equal to the fast cut angle difference setpoint, then the fast switching mode is determined as the target accident switching mode.

8. A power switching device for an integrated power generation, grid, load, and energy storage industrial park, characterized in that, The switching device includes: The model building module is used to establish a simulation model of the transient state of the power grid of the integrated power generation, grid, load and storage industrial park based on the load distribution, load type, energy storage control system and actual parameters of the industrial park. The simulation model includes generators, energy storage power stations, substation buses, multiple buses of different voltage levels, power switching devices corresponding to each bus, switching switches controlled by each power switching device and a comprehensive load model. The characteristic curve determination module is used to simulate the production load of the industrial park under different operating conditions in the simulation model based on the comprehensive load model and the primary architecture of the industrial park power grid, test the transient response characteristics of the rapid switching of power supply of each bus, and obtain the phase angle difference characteristic curve and the frequency difference characteristic curve of the multi-level bus. The target power switching device determination module is used to determine the target power switching device for switching the corresponding switching switch of any one of the multiple buses when the incoming power supply of any one of the buses fails. This is based on the multi-level bus fast switching logic in the simulation model. The power supply fast switching setting determination module is used to determine the power supply fast switching setting based on the preset fault switching mode, the phase angle difference characteristic curve of the multi-stage bus, and the frequency difference characteristic curve of the multi-stage bus; wherein, the power supply fast switching setting includes fast switching start delay, fast switching angle difference setting, fast switching frequency difference setting, advance angle difference setting, and advance frequency difference setting, and the preset fault switching mode includes fast switching mode and advance switching mode; The target fault switching mode determination module is used to determine the target fault switching mode used by the target power switching device from the preset fault switching modes according to the power rapid switching setting, so that the target power switching device switches the controlled switching switch based on the target fault switching mode.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the power switching method in the integrated power supply, grid, load, and storage industrial park as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the power switching method in the integrated power source-grid-load-storage industrial park as described in any one of claims 1 to 7.

Images