Power grid voltage stability analysis method and system taking into account new energy control switching, electronic device, storage medium and computer program product

Abstract

The present disclosure provides a power grid voltage stability analysis method and system taking into account new energy control switching, an electronic device, a storage medium and a computer program product. The method comprises: step 2: performing time domain simulation for a preset time on a mathematical model and a state transition model, if the new energy enters a ride-through state during the time domain simulation process, directly entering step 3, and otherwise outputting attention information and then entering step 3; step 3: on the basis of an electrical model, in a rated operation mode of a power system, calculating a power flow of the power system, and obtaining a terminal voltage of the new energy; step 4: on the basis of the electrical model and the mathematical model, in the rated operation mode of the power system, calculating the power flow of the power system, and obtaining a bus voltage of a POC bus; and, on the basis of the terminal voltage of the new energy, a threshold voltage for the new energy entering the ride-through state, and the bus voltage, outputting corresponding prompt information.

Description

A method and system for analyzing grid voltage stability considering new energy control switching, electronic equipment, storage medium, and computer program product

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The embodiments of the present disclosure are based on Chinese patent application number 2023114821648, application date November 9, 2023, and application name “A method and system for analyzing grid voltage stability considering new energy control switching”, and claim the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to, but is not limited to, the technical field of power system stability analysis, and in particular to a grid voltage stability analysis method and system, electronic equipment, storage medium, and computer program product considering renewable energy control switching. Background Art

[0004] The static voltage stability margin of power systems containing renewable energy is of great significance. However, relevant technologies are still unable to analyze the impact of renewable energy ride-through and control switching on voltage stability.

[0005] Summary of the Invention

[0006] Embodiments of the present disclosure provide a method and system for analyzing grid voltage stability taking into account new energy control switching, an electronic device, a storage medium, and a computer program product.

[0007] The present disclosure provides a method for analyzing grid voltage stability considering renewable energy control switching, including:

[0008] Step 1: Establish an electrical model of the power system including renewable energy, establish a mathematical model to reflect the control characteristics of renewable energy through-train, and establish a state transition model for switching between different control modes of renewable energy;

[0009] Step 2: Determine the rated operating mode of the power system, the active output of the renewable energy, and the reactive output of the renewable energy; perform a time-domain simulation of the mathematical model and the state transition model for a preset time; if the renewable energy enters a ride-through state during the time-domain simulation, directly proceed to Step 3; otherwise, output a warning message and proceed to Step 3; wherein the warning message is used to instruct the user to pay attention to the ride-through control mode of the electrical model;

[0010] Step 3: Based on the electrical model, under the rated operating mode of the power system, the renewable energy grid-connected node is regarded as a PQ node, the active power of the renewable energy grid-connected node is set to the renewable energy active output, and the reactive power is set to the renewable energy reactive output, the power system flow is calculated, and the renewable energy terminal voltage is obtained;

[0011] Step 4: Based on the electrical model and the mathematical model, under the rated operating mode of the power system, a constant impedance load and a constant current load are connected to the POC bus of the electrical model, the active power and reactive power of the new energy grid-connected node are both set to 0, the power system flow is calculated, and the bus voltage of the POC bus is obtained;

[0012] Step 5: Compare the generator-end voltage with the threshold voltage for the new energy to enter the ride-through state; if the generator-end voltage is greater than the threshold voltage, proceed to step 6; otherwise, proceed to step 7;

[0013] Step 6: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a first prompt message; if the bus voltage is not greater than the threshold voltage, output a second prompt message; wherein the first prompt message is used to indicate that there is no risk of voltage instability due to ride-through switching, and the second prompt message is used to indicate the risk of voltage instability or grid disconnection due to continued ride-through of renewable energy without recovery;

[0014] Step 7: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a third prompt message; if the bus voltage is not greater than the threshold voltage, output a fourth prompt message; wherein, the third prompt message is used to indicate the existence of voltage and power oscillations or the risk of new energy being disconnected from the grid due to repeated entry and exit of new energy, and the fourth prompt message is used to indicate the existence of voltage instability or the risk of new energy being disconnected from the grid due to continuous cross-country without recovery of new energy.

[0015] In some embodiments, the electrical model is composed of a distribution network, a main network, and an equivalent voltage source, and the distribution network is a centralized new energy station or a distribution network containing distributed new energy.

[0016] In some embodiments, the mathematical model is expressed as follows: P =SK P1 V t +K P2 I P0 +SI Pset ; I Q =SK Q1 (V L -V t )+SI Qset ;

[0017] Among them, S represents the rated capacity of new energy, I P Represents the active current during the new energy ride-through period, I Q Represents the reactive current during the new energy ride-through period, I P0Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for the new energy to enter the ride-through state, V t is the terminal voltage of the new energy.

[0018] In some implementations, the state transition logic of the state transition model is as follows:

[0019] When the current control mode of the new energy source is in a normal state, if the terminal voltage of the new energy source is less than the threshold voltage, the control mode of the new energy source is transferred from the normal state to the ride-through state;

[0020] When the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is not configured with a ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the normal state;

[0021] When the current control mode of the new energy source is the ride-through state, if the terminal voltage of the new energy source is greater than the threshold voltage and the new energy source is configured with the ride-through recovery function, the control mode of the new energy source is transferred from the ride-through state to the recovery state;

[0022] When the current control mode of the new energy source is the recovery state, if the terminal voltage of the new energy source is greater than the threshold voltage and the active power of the new energy source is not less than the active power of the normal state, the control mode of the new energy source is transferred from the recovery state to the normal state;

[0023] When the current control mode of the new energy source is the recovery state, if the terminal voltage of the new energy source is lower than the threshold voltage, the control mode of the new energy source is transferred from the recovery state to the ride-through state.

[0024] The present disclosure also provides a grid voltage stability analysis system considering renewable energy control switching, comprising:

[0025] A model building part is configured to build an electrical model of the power system including renewable energy, build a mathematical model for reflecting the control characteristics of renewable energy through-travel, and build a state transition model for switching between different control modes of renewable energy;

[0026] The determining portion is configured to determine the rated operating mode of the power system, the active output of the renewable energy, and the reactive output of the renewable energy; perform a time-domain simulation of the mathematical model and the state transition model for a preset time; if the renewable energy enters a ride-through state during the time-domain simulation, the first calculating portion directly performs the calculation processing; otherwise, a warning message is output and the first calculating portion performs the calculation processing; wherein the warning message is used to instruct a user to pay attention to the ride-through control mode of the electrical model;

[0027] The first calculation part is configured to calculate the power system flow based on the electrical model and, under the rated operating mode of the power system, regard the new energy grid-connected node as a PQ node, set the active power of the new energy grid-connected node as the active output of the new energy, and the reactive power as the reactive output of the new energy, to obtain the terminal voltage of the new energy;

[0028] The second calculation part is configured to connect a constant impedance load and a constant current load to the POC bus of the electrical model based on the electrical model and the mathematical model under the rated operation mode of the power system, set the active power and reactive power of the new energy grid-connected node to 0, calculate the power system flow, and obtain the bus voltage of the POC bus;

[0029] a comparison part configured to compare the generator-end voltage with a threshold voltage at which the new energy enters a ride-through state; if the generator-end voltage is greater than the threshold voltage, the first prompt part performs a corresponding prompt process; otherwise, the second prompt part performs a corresponding prompt process;

[0030] The first prompt portion is configured to compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, a first prompt message is output; if the bus voltage is not greater than the threshold voltage, a second prompt message is output; wherein the first prompt message is used to indicate that there is no risk of voltage instability due to ride-through switching, and the second prompt message is used to indicate that there is a risk of voltage instability or grid disconnection due to continued ride-through of renewable energy without recovery;

[0031] The second prompt part is configured to compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, a third prompt message is output; if the bus voltage is not greater than the threshold voltage, a fourth prompt message is output; wherein, the third prompt message is used to indicate the existence of voltage and power oscillations or the risk of new energy being disconnected from the grid due to repeated entry and exit of new energy, and the fourth prompt message is used to indicate the existence of voltage instability or the risk of new energy being disconnected from the grid due to continuous cross-border non-recovery of new energy.

[0032] In some embodiments, the electrical model is composed of a distribution network, a main network, and an equivalent voltage source, and the distribution network is a centralized new energy station or a distribution network containing distributed new energy.

[0033] In some embodiments, the mathematical model is expressed as follows: P =SK P1 V t +K P2 I P0 +SI Pset ; I Q =SK Q1 (V L -V t )+SI Qset ;

[0034] Among them, S represents the rated capacity of new energy, I P Represents the active current during the new energy ride-through period, I Q Represents the reactive current during the new energy ride-through period, I P0 Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for the new energy to enter the ride-through state, V t is the terminal voltage of the new energy.

[0035] In some implementations, the state transition logic of the state transition model is as follows:

[0036] When the current control mode of the new energy source is in a normal state, if the terminal voltage of the new energy source is less than the threshold voltage, the control mode of the new energy source is transferred from the normal state to the ride-through state;

[0037] When the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is not configured with a ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the normal state;

[0038] When the current control mode of the new energy source is the ride-through state, if the terminal voltage of the new energy source is greater than the threshold voltage and the new energy source is configured with the ride-through recovery function, the control mode of the new energy source is transferred from the ride-through state to the recovery state;

[0039] When the current control mode of the new energy source is the recovery state, if the terminal voltage of the new energy source is greater than the threshold voltage and the active power of the new energy source is not less than the active power of the normal state, the control mode of the new energy source is transferred from the recovery state to the normal state;

[0040] When the current control mode of the new energy source is the recovery state, if the terminal voltage of the new energy source is lower than the threshold voltage, the control mode of the new energy source is transferred from the recovery state to the ride-through state.

[0041] An embodiment of the present disclosure provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any one of the above aspects of the present disclosure.

[0042] An embodiment of the present disclosure provides an electronic device, comprising: a processor; a memory for storing instructions executable by the processor; the processor for reading the executable instructions from the memory and executing the executable instructions to implement the method described in any one of the above aspects of the present disclosure.

[0043] An embodiment of the present disclosure provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are run on an electronic device, the electronic device is enabled to execute any one of the above methods.

[0044] The present disclosure can be used for voltage stability analysis of power systems containing renewable energy sources. It can indicate the risk of voltage instability in the power system due to renewable energy control switching, including but not limited to voltage instability or grid disconnection risks caused by continuous ride-through of renewable energy sources without recovery, voltage and power oscillation or grid disconnection risks caused by repeated entry / exit of renewable energy sources, etc., providing guidance for power system planning, operation mode arrangement, and stability control. This solves the technical problem that existing technologies cannot analyze the impact of renewable energy ride-through and control switching on voltage stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments of the present disclosure will be described below.

[0046] A more complete understanding of exemplary embodiments of the present disclosure may be obtained by referring to the following drawings:

[0047] FIG1 is a flow chart of a method for analyzing grid voltage stability considering renewable energy control switching according to an embodiment of the present disclosure;

[0048] FIG2 is a schematic diagram of an electrical model of a power system including new energy provided by an embodiment of the present disclosure;

[0049] FIG3 is a schematic diagram of a state transition model for switching a new energy control mode provided by an embodiment of the present disclosure;

[0050] FIG4 is a schematic structural diagram of a grid voltage stability analysis system considering new energy control switching provided by an embodiment of the present disclosure;

[0051] FIG5 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

[0052] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and, together with the specification, are used to explain the technical solutions of the present disclosure. DETAILED DESCRIPTION

[0053] Below, the exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described herein.

[0054] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

[0055] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present disclosure are used to distinguish different steps, devices or parts, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0056] It should also be understood that in the embodiments of the present disclosure, “a plurality of” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0057] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0058] In addition, the term "and / or" in this disclosure describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this disclosure generally indicates that the related objects are in an "or" relationship.

[0059] It should also be understood that the description of the various embodiments in this disclosure focuses on the differences between the various embodiments, and reference can be made to the same or similar aspects thereof.

[0060] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0061] The following description of at least one exemplary embodiment is illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0062] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0063] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0064] In related technologies, due to the low-carbon, environmentally friendly, and sustainable development characteristics of new energy, my country's renewable energy generation has steadily increased in recent years, and the proportion of new energy in the power system has gradually increased. This indicates that new energy generation will become the mainstay of my country's future power supply. Therefore, the static voltage stability margin of power systems containing new energy is of great significance.

[0065] Current technology can determine the static voltage stability margin of the power system through specific analysis of the operation mode of the power system containing new energy, helping relevant personnel understand the stability of the large power grid.

[0066] Invention patent CN115940173B is a technology that can analyze the voltage stability of power systems containing renewable energy. In a renewable energy multi-station transmission system, this patent identifies a station as a disturbed station when the disturbance power at a station increases significantly. The patent also determines the power growth coefficients of the remaining stations in the renewable energy multi-station transmission system based on wind power forecasts. The patent also determines the power steady-state limit of the disturbed station based on the short-circuit capacity and impedance of each unit at the disturbed station and the power growth coefficients of the remaining stations. The patent also determines the static voltage stability limit power of the renewable energy multi-station transmission system based on the power steady-state limit of the disturbed station and the transmission power of the remaining stations. The patent also determines the margin ratio index of the renewable energy multi-station transmission system based on the static voltage stability limit power and initial operating power of the renewable energy multi-station transmission system, and determines the static voltage stability of the renewable energy multi-station transmission system based on the margin ratio index.

[0067] However, this technology only analyzes the static voltage stability margin of the power system, treating renewable energy sources as static, constant power sources. In actual operation, low-voltage ride-through of renewable energy sources is a common occurrence. During this period, the power of renewable energy sources fluctuates with the system voltage, and the control mode of renewable energy sources may switch between ride-through control and normal control. Therefore, existing technologies cannot analyze the impact of renewable energy ride-through and control switching on voltage stability.

[0068] The embodiments of the present disclosure can be applied to electronic devices such as communication terminals, computer systems, and servers, and can operate in conjunction with numerous other general-purpose or specialized computing system environments or configurations. Examples of well-known communication terminals, computing systems, environments, and / or configurations suitable for use with electronic devices such as communication terminals, computer systems, and servers include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above.

[0069] Electronic devices such as communication terminals, computer systems, and servers can be described in the general context of computer system-executable instructions (such as program modules) executed by the computer system. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked via a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media, including storage devices.

[0070] Terms used in this disclosure:

[0071] Low voltage ride through (LVRT): also known as low voltage transition capability, is defined as the ability of a small power generation system to withstand a certain limit of low grid voltage within a certain period of time without shutting down.

[0072] This disclosure proposes a method and system for analyzing grid voltage stability considering renewable energy control switching. Figure 1 is a flow chart of a method for analyzing grid voltage stability considering renewable energy control switching provided by an embodiment of the disclosure. As shown in Figure 1, the method for analyzing grid voltage stability considering renewable energy control switching includes the following steps:

[0073] Step 1: Establish an electrical model of the power system including renewable energy, establish a mathematical model to reflect the control characteristics of renewable energy through-train, and establish a state transition model for switching between different control modes of renewable energy;

[0074] In some embodiments, the electrical model is composed of a distribution network, a main grid, and an equivalent voltage source, and the distribution network is a centralized new energy station or a distribution network containing distributed new energy.

[0075] In an embodiment of the present disclosure, an electrical model of a power system including renewable energy is established. FIG2 is a schematic diagram of an electrical model of a power system including renewable energy provided by an embodiment of the present disclosure. As shown in FIG2 , RES represents renewable energy (centralized renewable energy or distributed renewable energy), POC represents a renewable energy grid connection node, and PCC represents a common connection point where the centralized renewable energy or distributed renewable energy distribution network is connected.

[0076] In some embodiments, the mathematical model is expressed as follows: P =SK P1 V t +K P2 I P0 +SI Pset ; I Q =SK Q1 (V L -V t )+SI Qset ;

[0077] Among them, S represents the rated capacity of new energy, I P Represents the active current during the new energy ride-through period, I Q Represents the reactive current during the new energy ride-through period, I P0 Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for the new energy to enter the ride-through state, V t is the terminal voltage of the new energy.

[0078] In the embodiment of the present disclosure, a mathematical model is established to reflect the low voltage ride-through control characteristics of the new energy. Formulas (1) to (2) provide an example of the mathematical model. In the formula, S represents the rated capacity of the new energy, I PRepresents the active current during the new energy ride-through period, I Q Represents the reactive current during the new energy ride-through period, I P0 Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for new energy to enter the ride-through state, V t is the terminal voltage of the new energy source. P =SK P1 V t +K P2 I P0 +SI Pset (1); I Q =SK Q1 (V L -V t )+SI Qset (2);

[0079] In some embodiments, the state transition logic of the state transition model is as follows: when the current control mode of the new energy is the normal state, if the terminal voltage of the new energy is less than the threshold voltage, the control mode of the new energy is transferred from the normal state to the ride-through state; when the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is not configured with a ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the normal state; when the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is configured with the ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the recovery state; when the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is configured with the ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the recovery state; when the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is greater than the threshold voltage and the active power of the new energy is not less than the active power of the normal state, the control mode of the new energy is transferred from the recovery state to the normal state; when the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is less than the threshold voltage, the control mode of the new energy is transferred from the recovery state to the ride-through state.

[0080] In the embodiment of the present disclosure, it is necessary to establish a state transition model for switching between different control modes of new energy. Figure 3 is a schematic diagram of a state transition model for switching between control modes of new energy provided by the embodiment of the present disclosure. As shown in Figure 3, its state transition logic is:

[0081] The current control mode of the new energy is normal. If V t Less than V L , then the control mode of the new energy is transferred from the normal state ① to the crossing state ②, that is, from ①→②;

[0082] The current control mode of the new energy is the ride-through state. If V t Greater than V L If the new energy source is not equipped with the low voltage ride-through recovery function, the control mode of the new energy source will be transferred from ride-through state ② to normal state ①, that is, from ② to ①;

[0083] The current control mode of the new energy is the ride-through state. If V t Greater than V L If the new energy source is equipped with a low voltage ride-through recovery function, the control mode of the new energy source will be transferred from ride-through state ② to recovery state ③, that is, from ② to ③;

[0084] The current control mode of the new energy is recovery state. If V t Greater than V L If the active power of the new energy source is not less than the active power of the normal state, the control mode of the new energy source is transferred from the recovery state ③ to the normal state ①, that is, from ③ to ①;

[0085] The current control mode of the new energy is recovery state. If V t Less than V L , the control mode of the new energy is transferred from the recovery state ③ to the crossing state ②, that is, from ③→②.

[0086] Step 2: Determine the rated operating mode of the power system, the active output of the renewable energy, and the reactive output of the renewable energy; perform a time-domain simulation of the mathematical model and the state transition model for a preset time; if the renewable energy enters a ride-through state during the time-domain simulation, directly proceed to Step 3; otherwise, output a warning message and proceed to Step 3; wherein the warning message is used to instruct the user to pay attention to the ride-through control mode of the electrical model;

[0087] In the embodiment of the present disclosure, it is necessary to determine the rated operating mode of the power system and the active output PR and reactive output QR of the new energy. In addition, a 5-second time-domain simulation of the established mathematical model and state transition model is performed using power system simulation software or mathematical calculation software. The voltage of the equivalent voltage source is set to decrease from 1.0pu to 0.7pu at 1.0 second and remain unchanged, and then increase to 1.0pu again at 1.1 seconds. If the new energy enters the over-crossing state during the simulation process, go directly to step 3, otherwise output the attention message "Please pay attention to the over-crossing control configuration method of the new energy model" and go to step 3.

[0088] Step 3: Based on the electrical model, under the rated operating mode of the power system, the renewable energy grid-connected node is regarded as a PQ node, the active power of the renewable energy grid-connected node is set to the renewable energy active output, and the reactive power is set to the renewable energy reactive output, the power system flow is calculated, and the renewable energy terminal voltage is obtained;

[0089] In the embodiment of the present disclosure, based on the electrical model, under the rated operation mode of the power system, the new energy grid-connected node (corresponding to the POC point in Figure 2) is regarded as the PQ node, and its active and reactive powers are the new energy active output PR and the new energy reactive output QR respectively. The power system flow is calculated to obtain the new energy terminal voltage V t1 .

[0090] Step 4: Based on the electrical model and the mathematical model, under the rated operating mode of the power system, a constant impedance load and a constant current load are connected to the POC bus of the electrical model, the active power and reactive power of the new energy grid-connected node are both set to 0, the power system flow is calculated, and the bus voltage of the POC bus is obtained;

[0091] In the embodiment of the present disclosure, based on the electrical model and the mathematical model, a constant impedance load and a constant current load are connected to the POC bus of the electrical model under the rated operation mode of the power system to calculate the power system flow. When calculating the flow, the active and reactive outputs of the new energy are set to 0, and the active load power P of the constant impedance load is set to 0. CZeq Set as P CZeq =-SK P1 , the reactive load power Q of the constant impedance load CZeq Set to Q CZeq =SK Q1 , the active load power P of the constant current load CIeq Let P CIeq =-K P2 I P0 -SI Pset , the reactive load power Q of the constant current load CIeq Set to QCIeq =-SK Q1 V L -SI Qset After the calculation is completed, the bus voltage of the POC bus obtained by the power flow calculation is recorded as V t2 .

[0092] Step 5: Compare the generator-end voltage with the threshold voltage for the new energy to enter the ride-through state; if the generator-end voltage is greater than the threshold voltage, proceed to step 6; otherwise, proceed to step 7;

[0093] Step 6: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a first prompt message; if the bus voltage is not greater than the threshold voltage, output a second prompt message; wherein the first prompt message is used to indicate that there is no risk of voltage instability due to ride-through switching, and the second prompt message is used to indicate the risk of voltage instability or grid disconnection due to continued ride-through of renewable energy without recovery;

[0094] Step 7: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a third prompt message; if the bus voltage is not greater than the threshold voltage, output a fourth prompt message; wherein, the third prompt message is used to indicate the existence of voltage and power oscillations or the risk of new energy being disconnected from the grid due to repeated entry and exit of new energy, and the fourth prompt message is used to indicate the existence of voltage instability or the risk of new energy being disconnected from the grid due to continuous cross-country without recovery of new energy.

[0095] In the embodiment of the present disclosure, V t1 and V L If V t1 Greater than V L , then go to step 6; otherwise go to step 7. Step 6: Compare V t2 and V L If V t2 Greater than V L , the output prompt message "There is no significant risk of voltage instability caused by ride-through switching" is output, and the analysis ends. Otherwise, the output prompt message "There is a risk of low voltage instability or grid disconnection caused by continued low voltage ride-through of renewable energy without recovery" is output, and the analysis ends.

[0096] Step 7: Compare V t2 and V L If V t2 Greater than V L, the system outputs a warning message stating that "there is a risk of voltage and power oscillation or grid disconnection caused by renewable energy sources repeatedly entering and exiting low voltage ride-through." The analysis ends. Otherwise, the system outputs a warning message stating that "there is a risk of low voltage instability or grid disconnection caused by renewable energy sources continuously experiencing low voltage ride-through without recovery." The analysis ends.

[0097] In summary, the present disclosure can be used for voltage stability analysis of power systems containing renewable energy sources. It can indicate the risk of voltage instability in the power system due to renewable energy control switching, including but not limited to voltage instability or grid disconnection risks caused by continuous ride-through of renewable energy sources without recovery, voltage and power oscillation or grid disconnection risks caused by repeated entry / exit of renewable energy sources, and other factors. This provides guidance for power system planning, operation mode arrangement, and stability control. This solves the technical problem that existing technologies cannot analyze the impact of renewable energy ride-through and control switching on voltage stability.

[0098] Those skilled in the art will understand that in the above-mentioned method of the specific implementation method, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0099] FIG4 is a schematic diagram of a system for analyzing grid voltage stability considering renewable energy control switching according to an embodiment of the present disclosure. As shown in FIG4 , the system includes:

[0100] The model building section 410 is configured to build an electrical model of the power system including renewable energy, build a mathematical model for reflecting the ride-through control characteristics of renewable energy, and build a state transition model for switching between different control modes of renewable energy;

[0101] The determining portion 420 is configured to determine the rated operating mode of the power system, the active output of the renewable energy source, and the reactive output of the renewable energy source; perform a time-domain simulation of the mathematical model and the state transition model for a preset time; if the renewable energy source enters a ride-through state during the time-domain simulation, the first calculating portion directly performs the calculation processing; otherwise, a warning message is output and the first calculating portion performs the calculation processing; wherein the warning message is used to instruct the user to pay attention to the ride-through control mode of the electrical model;

[0102] The first calculation unit 430 is configured to calculate the power system flow based on the electrical model and, under the rated operating mode of the power system, treat the new energy grid-connected node as a PQ node, set the active power of the new energy grid-connected node as the active output of the new energy, and the reactive power as the reactive output of the new energy, to obtain the terminal voltage of the new energy;

[0103] The second calculation part 440 is configured to connect a constant impedance load and a constant current load to the POC bus of the electrical model based on the electrical model and the mathematical model under the rated operation mode of the power system, set the active power and reactive power of the new energy grid-connected node to 0, calculate the power flow of the power system, and obtain the bus voltage of the POC bus;

[0104] The comparison part 450 is configured to compare the generator terminal voltage with a threshold voltage for the new energy to enter a ride-through state; if the generator terminal voltage is greater than the threshold voltage, the first prompt part performs a corresponding prompt process; otherwise, the second prompt part performs a corresponding prompt process;

[0105] The first prompt portion 460 is configured to compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, a first prompt message is output; if the bus voltage is not greater than the threshold voltage, a second prompt message is output; wherein the first prompt message is used to indicate that there is no risk of voltage instability due to ride-through switching, and the second prompt message is used to indicate that there is a risk of voltage instability or grid disconnection due to continued ride-through of renewable energy without recovery;

[0106] The second prompt part 470 is configured to compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, a third prompt message is output; if the bus voltage is not greater than the threshold voltage, a fourth prompt message is output; wherein, the third prompt message is used to indicate the existence of voltage and power oscillations or the risk of new energy being disconnected from the grid due to repeated entry and exit of new energy, and the fourth prompt message is used to indicate the existence of voltage instability or the risk of new energy being disconnected from the grid due to continuous cross-border non-recovery of new energy.

[0107] In some embodiments, the electrical model is composed of a distribution network, a main network, and an equivalent voltage source, and the distribution network is a centralized new energy station or a distribution network containing distributed new energy.

[0108] In some embodiments, the mathematical model is expressed as follows: P =SK P1 V t +K P2 I P0 +SI Pset ; I Q =SK Q1 (V L -V t )+SI Qset ;

[0109] Among them, S represents the rated capacity of new energy, I P Represents the active current during the new energy ride-through period, IQ Represents the reactive current during the new energy ride-through period, I P0 Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for the new energy to enter the ride-through state, V t is the terminal voltage of the new energy.

[0110] In some implementations, the state transition logic of the state transition model is as follows:

[0111] When the current control mode of the new energy source is in the normal state, if the terminal voltage of the new energy source is lower than the threshold voltage, the control mode of the new energy source is transferred from the normal state to the ride-through state;

[0112] When the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is not configured with a ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the normal state;

[0113] When the current control mode of the new energy source is the ride-through state, if the terminal voltage of the new energy source is greater than the threshold voltage and the new energy source is configured with the ride-through recovery function, the control mode of the new energy source is transferred from the ride-through state to the recovery state;

[0114] When the current control mode of the new energy source is the recovery state, if the terminal voltage of the new energy source is greater than the threshold voltage and the active power of the new energy source is not less than the active power of the normal state, the control mode of the new energy source is transferred from the recovery state to the normal state;

[0115] When the current control mode of the new energy source is the recovery state, if the terminal voltage of the new energy source is lower than the threshold voltage, the control mode of the new energy source is transferred from the recovery state to the ride-through state.

[0116] The grid voltage stability analysis system considering renewable energy control switching according to an embodiment of the present disclosure corresponds to the grid voltage stability analysis method considering renewable energy control switching according to another embodiment of the present disclosure.

[0117] FIG5 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure. As shown in FIG5 , the electronic device 50 includes one or more processors 51 and a memory 52 .

[0118] The processor 51 may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0119] The memory 52 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may, for example, include read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 51 may run the program instructions to implement the methods of the software programs of the various embodiments of the present disclosure described above and / or other desired functions. In one example, the electronic device may further include: an input device 53 and an output device 54, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0120] In addition, the input device 53 may also include, for example, a keyboard, a mouse, and the like.

[0121] The output device 54 can output various information to the outside. The output device 54 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0122] Of course, for the sake of simplicity, Figure 5 shows some of the components related to the present disclosure in the electronic device, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may further include any other appropriate components according to specific application scenarios.

[0123] In addition to the above-mentioned methods and devices, an embodiment of the present disclosure may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to perform the steps of the method according to various embodiments of the present disclosure described in the above-mentioned "Exemplary Method" section of this specification.

[0124] The computer program product may be written in any combination of one or more programming languages ​​to implement the operations of the disclosed embodiments, including object-oriented programming languages ​​such as Java, C++, and conventional procedural programming languages ​​such as C or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0125] In addition, an embodiment of the present disclosure may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present disclosure described in the above “Exemplary Method” section of this specification.

[0126] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0127] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are examples rather than limitations, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of the present disclosure. In addition, the specific details disclosed above are for illustrative purposes and to facilitate understanding, rather than limitations, and the above details do not limit the present disclosure to the specific details required to be implemented.

[0128] Each embodiment in this specification is described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. References to the same or similar parts between the various embodiments are sufficient. For system embodiments, since they largely correspond to method embodiments, their description is relatively simple. For relevant parts, references to the description of the method embodiments are sufficient.

[0129] The block diagrams of the devices, systems, equipment, and systems involved in this disclosure are intended to be illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0130] The methods and systems of the present disclosure may be implemented in many ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustrative purposes only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless otherwise specified. In addition, in some embodiments, the present disclosure may also be implemented as programs recorded in a recording medium, which include machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers recording media that store programs for executing the methods according to the present disclosure.

[0131] It should also be noted that, in the systems, devices and methods of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present disclosure. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0132] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof. Industrial Applicability

[0133] The embodiment of the present disclosure provides a grid voltage stability analysis method and system, electronic equipment, storage medium and computer program product considering the control switching of new energy sources, wherein the grid voltage stability analysis method includes: step 1: establishing an electrical model of the power system including new energy sources, establishing a mathematical model for reflecting the control characteristics of the new energy through-travel, and establishing a state transition model for switching between different control modes of new energy sources; step 2: determining the rated operating mode of the power system, the active output of the new energy sources and the reactive output of the new energy sources; performing time domain simulation on the mathematical model and the state transition model for a preset time, and if the new energy enters a through-travel state during the time domain simulation process , then directly enter step 3, otherwise output the attention information and enter step 3; wherein, the attention information is used to instruct the user to pay attention to the ride-through control mode of the electrical model; Step 3: Based on the electrical model, under the rated operation mode of the power system, the new energy grid-connected node is regarded as a PQ node, the active power of the new energy grid-connected node is set to the active output of the new energy, and the reactive power is set to the reactive output of the new energy, the power system flow is calculated, and the terminal voltage of the new energy is obtained; Step 4: Based on the electrical model and the mathematical model, under the rated operation mode of the power system, a constant impedance load and a constant current load are connected The POC bus of the electrical model is input, the active power and reactive power of the new energy grid-connected node are set to 0, the power system flow is calculated, and the bus voltage of the POC bus is obtained; Step 5: the generator terminal voltage is compared with the threshold voltage for the new energy to enter the ride-through state; if the generator terminal voltage is greater than the threshold voltage, step 6 is performed; otherwise, step 7 is performed; Step 6: the bus voltage is compared with the threshold voltage; if the bus voltage is greater than the threshold voltage, a first prompt message is output; if the bus voltage is not greater than the threshold voltage, a second prompt message is output; wherein, the first prompt message is used to indicate that there is no ride-through The risk of voltage instability caused by switching the dominant voltage, the second prompt information is used to indicate the risk of voltage instability or grid disconnection caused by continuous cross-travel of new energy without recovery; Step 7: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a third prompt information; if the bus voltage is not greater than the threshold voltage, output a fourth prompt information; wherein, the third prompt information is used to indicate the risk of voltage and power oscillation or grid disconnection caused by repeated entry and exit of new energy, and the fourth prompt information is used to indicate the risk of voltage instability or grid disconnection caused by continuous cross-travel of new energy without recovery. The above scheme can be used for voltage stability analysis of power systems containing new energy, and can indicate the voltage instability risk of power systems under the control of new energy switching, including but not limited to voltage instability or grid disconnection risk caused by continuous cross-travel of new energy without recovery, voltage and power oscillation or grid disconnection risk caused by repeated entry / exit of new energy, etc., providing guidance for power system planning, operation mode arrangement, stability control, etc.This solves the technical problem that the existing technology cannot analyze the impact of new energy ride-through and control switching on voltage stability.

Claims

1. A method for analyzing grid voltage stability considering renewable energy control switching, wherein: The method comprises: Step 1: Establish an electrical model of the power system including new energy, establish a mathematical model for reflecting the control characteristics of new energy through-travel, and establish a state transition model for switching between different control modes of new energy; Step 2: Determine the rated operation mode of the power system, the active output of new energy, and the reactive output of new energy; perform time domain simulation on the mathematical model and the state transition model for a preset time, and if the new energy enters the ride-through state during the time domain simulation, directly enter step 3, otherwise output a warning message and enter step 3; wherein the warning message is used to instruct the user to pay attention to the ride-through control mode of the electrical model; Step 3: Based on the electrical model, under the rated operation mode of the power system, the new energy grid-connected node is regarded as a PQ node, the active power of the new energy grid-connected node is set to the active output of the new energy, and the reactive power is set to the reactive output of the new energy, the power system flow is calculated, and the terminal voltage of the new energy is obtained; Step 4: Based on the electrical model and the mathematical model, under the rated operation mode of the power system, a constant impedance load and a constant current load are connected to the POC bus of the electrical model, the active power and reactive power of the new energy grid-connected node are set to 0, the power system flow is calculated, and the bus voltage of the POC bus is obtained; Step 5: Compare the terminal voltage with the threshold voltage for the new energy to enter the ride-through state; if the terminal voltage is greater than the threshold voltage, proceed to step 6; otherwise, proceed to step 7; Step 6: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a first prompt message; if the bus voltage is not greater than the threshold voltage, output a second prompt message; wherein the first prompt message is used to indicate that there is no risk of voltage instability due to the dominant voltage being switched through, and the second prompt message is used to indicate that there is a risk of voltage instability or grid disconnection due to continuous crossover of new energy without recovery; Step 7: Compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, output a third prompt message; if the bus voltage is not greater than the threshold voltage, output a fourth prompt message; wherein, the third prompt message is used to indicate the existence of voltage and power oscillations or the risk of new energy being disconnected from the grid due to repeated entry and exit of new energy, and the fourth prompt message is used to indicate the existence of voltage instability or the risk of new energy being disconnected from the grid due to continuous crossing of new energy without recovery.

2. The method according to claim 1, wherein: The electrical model consists of a distribution network, a main network and an equivalent voltage source. The distribution network is a centralized new energy station or a distribution network containing distributed new energy.

3. The method according to claim 1, wherein: The mathematical model is expressed as follows: P =SK P1 V t +K P2 I P0 +SI Pset ; I Q =SK Q1 (V L -V t )+SI Qset ; Among them, S represents the rated capacity of new energy, I P Represents the active current during the new energy ride-through period, I Q Represents the reactive current during the renewable energy ride-through period, I P0 Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for the new energy to enter the cross-state, V t is the terminal voltage of the new energy.

4. The method according to claim 1, wherein: The state transition logic of the state transition model is as follows: When the current control mode of the new energy is in a normal state, if the terminal voltage of the new energy is less than the threshold voltage, the control mode of the new energy is transferred from the normal state to the ride-through state; When the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is not configured with a ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the normal state; When the current control mode of the new energy source is the ride-through state, if the terminal voltage of the new energy source is greater than the If the new energy source is configured with the ride-through recovery function, the control mode of the new energy source is transferred from the ride-through state to the recovery state; When the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is greater than the threshold voltage and the active power of the new energy is not less than the active power of the normal state, the control mode of the new energy is transferred from the recovery state to the normal state; When the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is less than the threshold voltage, the control mode of the new energy is transferred from the recovery state to the ride-through state.

5. A grid voltage stability analysis system considering new energy control switching, wherein: The system comprises: A model building part is configured to build an electrical model of the power system including new energy, build a mathematical model for reflecting the control characteristics of the new energy through, and build a state transition model for switching between different control modes of the new energy; The determination part is configured to determine the rated operation mode of the power system, the active output of the new energy, and the reactive output of the new energy; perform time domain simulation on the mathematical model and the state transition model for a preset time, and if the new energy enters the ride-through state during the time domain simulation, the first calculation part directly performs calculation processing, otherwise, the first calculation part performs calculation processing after outputting attention information; wherein the attention information is used to instruct the user to pay attention to the ride-through control mode of the electrical model; The first calculation part is configured to calculate the power system flow based on the electrical model, in the rated operation mode of the power system, regard the new energy grid-connected node as a PQ node, set the active power of the new energy grid-connected node to the active output of the new energy, and the reactive power to the reactive output of the new energy, and obtain the terminal voltage of the new energy; The second calculation part is configured to connect a constant impedance load and a constant current load to the POC bus of the electrical model based on the electrical model and the mathematical model under the rated operation mode of the power system, set the active power and reactive power of the new energy grid-connected node to 0, calculate the power system flow, and obtain the bus voltage of the POC bus; The comparison part is configured to compare the machine-end voltage with a threshold voltage for the new energy to enter a ride-through state; if the machine-end voltage is greater than the threshold voltage, the first prompt part performs a corresponding prompt process; otherwise, the second prompt part performs a corresponding prompt process; The first prompt part is configured to compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, a first prompt message is output; if the bus voltage is not greater than the threshold voltage, a second prompt message is output; wherein the first prompt message is used to indicate that there is no risk of voltage instability due to the dominant voltage being switched through, and the second prompt message is used to indicate that there is a risk of voltage instability or grid disconnection due to continuous crossover of new energy without recovery; The second prompt part is configured to compare the bus voltage with the threshold voltage; if the bus voltage is greater than the threshold voltage, a third prompt message is output; if the bus voltage is not greater than the threshold voltage, a fourth prompt message is output; wherein, the third prompt message is used to indicate the existence of voltage and power oscillations or the risk of new energy being disconnected from the grid due to repeated entry and exit of new energy, and the fourth prompt message is used to indicate the existence of voltage instability or the risk of new energy being disconnected from the grid due to continuous crossing of new energy without recovery.

6. The system according to claim 5, wherein: The electrical model consists of a distribution network, a main network and an equivalent voltage source. The distribution network is a centralized new energy station or a distribution network containing distributed new energy.

7. The system according to claim 5, wherein: The mathematical model is expressed as follows: P =SK P1 V t +K P2 I P0 +SI Pset ; I Q =SK Q1 (V L -V t )+SI Qset ; Among them, S represents the rated capacity of new energy, I P Represents the active current during the new energy ride-through period, I Q Represents the reactive current during the renewable energy ride-through period, I P0 Indicates the active current of the new energy before entering the ride-through state, K P1 It is the first control parameter of active current during the new energy ride-through period, K P2 It is the second control parameter of the active current during the new energy ride-through period, I Pset is the active current bias parameter during the new energy ride-through period, K Q1 is the control parameter of reactive current during the renewable energy ride-through period, I Qset is the reactive current bias parameter during the new energy ride-through period, V L is the threshold voltage for the new energy to enter the cross-state, V t is the terminal voltage of the new energy.

8. The system according to claim 5, wherein: The state transition logic of the state transition model is as follows: When the current control mode of the new energy is in a normal state, if the terminal voltage of the new energy is less than the threshold voltage, the control mode of the new energy is transferred from the normal state to the ride-through state; When the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is not configured with a ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the normal state; When the current control mode of the new energy is the ride-through state, if the terminal voltage of the new energy is greater than the threshold voltage and the new energy is configured with the ride-through recovery function, the control mode of the new energy is transferred from the ride-through state to the recovery state; When the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is greater than the threshold voltage and the active power of the new energy is not less than the active power of the normal state, the control mode of the new energy is transferred from the recovery state to the normal state; When the current control mode of the new energy is the recovery state, if the terminal voltage of the new energy is less than the threshold voltage, the control mode of the new energy is transferred from the recovery state to the ride-through state.

9. A computer-readable storage medium storing a computer program, wherein the computer program is used to execute the method according to any one of claims 1 to 4.

10. An electronic device, wherein: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the executable instructions to implement the method described in any one of claims 1 to 4 above.

11. A computer program product, comprising a computer program or instructions, which, when executed on an electronic device, enables the electronic device to execute the method according to any one of claims 1 to 4.

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