Method and device for identifying instability link of new energy fault ride-through

Abstract

A new energy fault ride-through instability link identification method and device, the method comprises: obtaining inherent parameters and real-time parameters of a new energy grid-connected system; establishing a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters; obtaining transient energy flow corresponding to each control link based on the new energy grid-connected system model; identifying the dominant transient instability link of the new energy grid-connected system according to the transient energy flow corresponding to each control link. Through the new energy fault ride-through instability link identification method and device provided in the embodiment of the application, the dominant link and process of transient instability under power grid large disturbance can be accurately located, thereby providing a clear research object for subsequent parameter optimization, control strategy improvement and the like.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a method and apparatus for identifying instability links during fault ride-through in new energy sources. Background Technology

[0002] In recent years, the penetration rate of power electronic equipment based on voltage source converters in power systems has gradually increased. New energy control dynamics not only deeply participate in the power system's safety and stability process, but also play a leading role in transient instability in some power systems with high new energy penetration. Increasing research indicates that coupling between control components of new energy sources, and coupling between the control components of new energy sources and the power grid, have a significant impact on the occurrence and amplification of transient instability.

[0003] However, current research on coupling relationships is mainly based on linearized models of small signals, with few coupling relationship analysis models applicable to transient stability studies under large disturbances. Furthermore, current quantification of coupling degree is primarily based on methods such as sensitivity analysis. Since these methods lack a clear physical energy meaning, their engineering guidance for subsequent parameter optimization and control strategy improvement is limited. Summary of the Invention

[0004] In view of this, the present invention proposes a method and device for identifying the instability link of new energy fault crossing, aiming to solve the problem that it is difficult to identify the dominant link of transient instability caused by the control characteristics of new energy under large disturbances in related technologies.

[0005] In a first aspect, embodiments of the present invention provide a method for identifying instability links during fault ride-through in new energy systems, comprising: acquiring inherent parameters and real-time parameters of a new energy grid-connected system; establishing a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters; obtaining the transient energy flow corresponding to each control link based on the new energy grid-connected system model; and identifying the dominant transient instability link of the new energy grid-connected system according to the transient energy flow corresponding to each control link.

[0006] Furthermore, the inherent parameters include: active power reference value, reactive power reference value, active power outer loop control parameters, reactive power outer loop control parameters, phase-locked loop control parameters, grid-connected resistance, grid-connected reactance, voltage amplitude of the infinite voltage source, and frequency of the infinite voltage source; the real-time parameters include: real-time active power value, real-time reactive power value, phase-locked angle, phase-locked frequency, first digital quantity, second digital quantity, and the q-axis component of the new energy generator terminal voltage and the derivative of the q-axis component with respect to time.

[0007] Furthermore, based on the inherent parameters and the real-time parameters, a new energy grid-connected system model based on transient energy flow is established, including: obtaining the active current, reactive current, the derivative of the phase-locked angle with respect to time, and the derivative of the phase-locked frequency with respect to time based on the inherent parameters and the real-time parameters; obtaining the corrected real-time active value and the corrected real-time reactive value based on the voltage amplitude of the infinite voltage source, the grid-connected resistance, the grid-connected reactance, the phase-locked angle, the phase-locked frequency, the active current, and the reactive current; and establishing a new energy grid-connected system model based on transient energy flow based on the corrected real-time active value, the corrected real-time reactive value, the active current, the reactive current, the derivative of the phase-locked angle with respect to time, and the derivative of the phase-locked frequency with respect to time.

[0008] Further, based on the inherent parameters and the real-time parameters, the active current, reactive current, the derivative of the phase-locked angle with respect to time, and the derivative of the phase-locked frequency with respect to time are obtained, including: obtaining the active current i using the following formula. d and reactive current i q : Where x1' is the derivative of the first digital quantity x1 with respect to time, x2' is the derivative of the second digital quantity x2 with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 The reactive power outer loop control parameters are given by the following formulas: the derivative of the phase-locked angle with respect to time δ' and the derivative of the phase-locked frequency with respect to time ω' are obtained by the following formulas: Where ω is the phase-locked frequency, ω g k is the frequency of an infinite voltage source. p3 k i3 For phase-locked loop control parameters, u q0 u is the q-axis component of the new energy generator terminal voltage. q0 ' is the time derivative of the q-axis component of the new energy generator terminal voltage.

[0009] Furthermore, based on the voltage amplitude, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current of the infinite voltage source, the corrected real-time active value and the corrected real-time reactive value are obtained, including: obtaining the corrected real-time active value P and the corrected real-time reactive value Q using the following formula: P = u d i d +u q i q Q=u q i d -u d i q ; where u d For the corrected d-axis component of the new energy generator terminal voltage, u qFor the corrected q-axis component of the new energy generator terminal voltage, i d For active current, i q This represents the reactive current; where u is the d-axis component of the corrected renewable energy generator terminal voltage. d and the corrected q-axis component u of the new energy generator terminal voltage q The following formula is used to obtain: Among them, U g Let R be the voltage amplitude of the infinite voltage source, L be the grid resistance, L be the grid reactance, δ be the phase-locked angle, ω be the phase-locked frequency, and i be the voltage amplitude of the infinite voltage source. d For active current, i q This is reactive current.

[0010] Furthermore, based on the corrected real-time active power value, corrected real-time reactive power value, active current, reactive current, the derivative of the phase-locked angle with respect to time, and the derivative of the phase-locked frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established, including: obtaining the new energy grid-connected system model based on transient energy flow using the following formula:

[0011]

[0012] in,

[0013]

[0014]

[0015] i x =i d cosδ-i q sinδ,i y =i q cosδ+i d sinδ;

[0016]

[0017]

[0018] Among them, i d ' is the derivative of the active current with respect to time, i q ' is the derivative of reactive current with respect to time, δ' is the derivative of phase-locked angle with respect to time, ω' is the derivative of phase-locked frequency with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 For reactive power outer loop control parameters, k p3 k i3 Here are the phase-locked loop control parameters, where ω is the phase-locked frequency, δ is the phase-locked angle, and U is the phase-locked loop angle.g Let ω be the voltage amplitude of an infinite voltage source. g R is the frequency of the infinite voltage source, L is the grid resistance, L is the grid reactance, and P is the voltage source. ref Q is the active power reference value. ref P is the reactive power reference value, P is the corrected real-time active power value, and Q is the corrected real-time reactive power value.

[0019] Furthermore, based on the aforementioned new energy grid-connected system model, the transient energy flows corresponding to each control link are obtained, including: based on the aforementioned new energy grid-connected system model, the first energy flow Inflow1, the second energy flow Inflow2, the third energy flow Inflow3, the fourth energy flow Inflow4, and the fifth energy flow Inflow5 are obtained as follows:

[0020] Furthermore, based on the transient energy flows corresponding to each control link, the dominant transient instability link of the new energy grid-connected system is identified, including: after a fault disturbance, if the time-domain waveform of the first energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the active power outer loop; if the time-domain waveform of the second energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the reactive power outer loop; third, if the time-domain waveform of the energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the PLL; if the time-domain waveform of the fourth energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the active power interaction between the grid and the new energy power source; if the time-domain waveform of the fifth energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the reactive power interaction between the grid and the new energy power source.

[0021] Secondly, embodiments of the present invention also provide a device for identifying instability links during fault ride in new energy systems, comprising: an acquisition unit for acquiring inherent parameters and real-time parameters of the new energy grid-connected system; a modeling unit for establishing a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters; a processing unit for obtaining the transient energy flow corresponding to each control link based on the new energy grid-connected system model; and an identification unit for identifying the dominant transient instability link of the new energy grid-connected system according to the transient energy flow corresponding to each control link.

[0022] Furthermore, the inherent parameters include: active power reference value, reactive power reference value, active power outer loop control parameters, reactive power outer loop control parameters, phase-locked loop control parameters, grid-connected resistance, grid-connected reactance, voltage amplitude of the infinite voltage source, and frequency of the infinite voltage source; the real-time parameters include: real-time active power value, real-time reactive power value, phase-locked angle, phase-locked frequency, first digital quantity, second digital quantity, and the q-axis component of the new energy generator terminal voltage and the derivative of the q-axis component with respect to time.

[0023] Furthermore, the modeling unit is also used to: obtain the active current, reactive current, phase-locked angle derivative with respect to time, and phase-locked frequency derivative with respect to time based on the inherent parameters and the real-time parameters; obtain the corrected real-time active value and the corrected real-time reactive value based on the voltage amplitude of the infinite voltage source, grid-connected resistance, grid-connected reactance, phase-locked angle, phase-locked frequency, active current, and reactive current; and establish a new energy grid-connected system model based on transient energy flow based on the corrected real-time active value, the corrected real-time reactive value, active current, reactive current, phase-locked angle derivative with respect to time, and phase-locked frequency derivative with respect to time.

[0024] Further, based on the inherent parameters and the real-time parameters, the active current, reactive current, the derivative of the phase-locked angle with respect to time, and the derivative of the phase-locked frequency with respect to time are obtained, including: obtaining the active current i using the following formula. d and reactive current i q : Where x1' is the derivative of the first digital quantity x1 with respect to time, x2' is the derivative of the second digital quantity x2 with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 The reactive power outer loop control parameters are given by the following formulas: the derivative of the phase-locked angle with respect to time δ' and the derivative of the phase-locked frequency with respect to time ω' are obtained by the following formulas: Where ω is the phase-locked frequency, ω g k is the frequency of an infinite voltage source. p3 k i3 For phase-locked loop control parameters, u q0 u is the q-axis component of the new energy generator terminal voltage. q0 ' is the time derivative of the q-axis component of the new energy generator terminal voltage.

[0025] Furthermore, based on the voltage amplitude, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current of the infinite voltage source, the corrected real-time active value and the corrected real-time reactive value are obtained, including: obtaining the corrected real-time active value P and the corrected real-time reactive value Q using the following formula: P = u d i d +uq i q Q=u q i d -u d i q ; where u d For the corrected d-axis component of the new energy generator terminal voltage, u q For the corrected q-axis component of the new energy generator terminal voltage, i d For active current, i q This represents the reactive current; where u is the d-axis component of the corrected renewable energy generator terminal voltage. d and the corrected q-axis component u of the new energy generator terminal voltage q The following formula is used to obtain: Among them, U g Let R be the voltage amplitude of the infinite voltage source, L be the grid resistance, L be the grid reactance, δ be the phase-locked angle, ω be the phase-locked frequency, and i be the voltage amplitude of the infinite voltage source. d For active current, i q This is reactive current.

[0026] Furthermore, based on the corrected real-time active power value, corrected real-time reactive power value, active current, reactive current, the derivative of the phase-locked angle with respect to time, and the derivative of the phase-locked frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established, including: obtaining the new energy grid-connected system model based on transient energy flow using the following formula:

[0027]

[0028] in,

[0029]

[0030]

[0031] i x =i d cosδ-i q sinδ,i y =i q cosδ+i d sinδ;

[0032]

[0033]

[0034] Among them, i d ' is the derivative of the active current with respect to time, i q ' is the derivative of reactive current with respect to time, δ' is the derivative of phase-locked angle with respect to time, ω' is the derivative of phase-locked frequency with respect to time, and kp1 k i1 For the active outer loop control parameters, k p2 k i2 For reactive power outer loop control parameters, k p3 k i3 Here are the phase-locked loop control parameters, where ω is the phase-locked frequency, δ is the phase-locked angle, and U is the phase-locked loop angle. g Let ω be the voltage amplitude of an infinite voltage source. g R is the frequency of the infinite voltage source, L is the grid resistance, L is the grid reactance, and P is the voltage source. ref Q is the active power reference value. ref P is the reactive power reference value, P is the corrected real-time active power value, and Q is the corrected real-time reactive power value.

[0035] Furthermore, the processing unit is also used to: based on the new energy grid-connected system model, obtain the first energy flow Inflow1, the second energy flow Inflow2, the third energy flow Inflow3, the fourth energy flow Inflow4, and the fifth energy flow Inflow5 as follows:

[0036] Furthermore, the identification unit is also used to: after a fault disturbance, if the time-domain waveform of the first energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the active power outer loop; if the time-domain waveform of the second energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the reactive power outer loop; thirdly, if the time-domain waveform of the energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the PLL; if the time-domain waveform of the fourth energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the active power interaction between the grid and the new energy power source; if the time-domain waveform of the fifth energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the reactive power interaction between the grid and the new energy power source. Thirdly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the new energy fault ride-through instability identification method provided in the above embodiments. Fourthly, embodiments of the present invention also provide an electronic device, comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the executable instructions to implement the new energy fault ride-through instability identification method provided in the above embodiments.

[0037] The new energy fault-crossing instability identification method and apparatus provided in this invention establishes a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters. Based on the new energy grid-connected system model, the transient energy flow corresponding to each control link is obtained. Based on the transient energy flow corresponding to each control link, the dominant transient instability link of the new energy grid-connected system is identified. This can accurately locate the dominant link and process of transient instability under large grid disturbances, thereby providing a clear research object for subsequent parameter optimization, control strategy improvement and other work. Attached Figure Description

[0038] Figure 1 An exemplary flowchart of a new energy fault-crossing instability identification method according to an embodiment of the present invention is shown;

[0039] Figure 2 A schematic diagram of a new energy grid-connected system according to an embodiment of the present invention is shown;

[0040] Figure 3 A schematic diagram of a new energy fault crossing instability identification device according to an embodiment of the present invention is shown. Detailed Implementation

[0041] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0042] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0043] Figure 1 An exemplary flowchart of a new energy fault-crossing instability identification method according to an embodiment of the present invention is shown.

[0044] like Figure 1 As shown, the method for identifying the instability stage of a new energy source fault includes:

[0045] Step S101: Obtain the inherent parameters and real-time parameters of the new energy grid-connected system.

[0046] Figure 2A schematic diagram of a new energy grid-connected system according to an embodiment of the present invention is shown. Figure 2 As shown, considering the dynamics of the phase-locked loop and outer loop controller of the inverter on the new energy grid side, the inherent parameters and real-time parameters are obtained based on the actual power system operation mode.

[0047] Furthermore, the inherent parameters include: active reference value, reactive reference value, active outer loop control parameters, reactive outer loop control parameters, phase-locked loop control parameters, grid-connected resistance, grid-connected reactance, voltage amplitude of the infinite voltage source, and frequency of the infinite voltage source;

[0048] Real-time parameters include: real-time active power, real-time reactive power, phase-locked angle, phase-locked frequency, first digital quantity, second digital quantity, and the q-axis component of the new energy generator terminal voltage and the derivative of the q-axis component with respect to time.

[0049] Specifically, the inherent parameters are parameters with fixed values, including: the active power reference value P of the new energy power supply control system. ref Reactive power reference value Q ref Active power outer loop control parameters (k) p1 k i1 ), reactive power outer loop control parameters (k) p2 k i2 ), phase-locked loop control parameters (k) p3 k i3 ), grid-connected impedance (R, L), voltage amplitude and frequency of the infinite voltage source (U) g ω g Real-time parameters are used to monitor and read real-time data, including: real-time active power P0, real-time reactive power Q0, phase-locked loop angle δ, phase-locked loop frequency ω, first digital quantity x1, second digital quantity x2, and the q-axis component u of the new energy generator terminal voltage. q0 and its time derivative u q0 '.

[0050] Step S102: Based on the inherent parameters and real-time parameters, establish a new energy grid-connected system model based on transient energy flow.

[0051] Further, step S102 includes:

[0052] Based on the inherent parameters and real-time parameters, the derivative values ​​of active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained.

[0053] Based on the voltage amplitude of the infinite voltage source, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current, the corrected real-time active value and the corrected real-time reactive value are obtained.

[0054] Based on the corrected real-time active power, corrected real-time reactive power, active current, reactive current, the derivative of phase-locked angle with respect to time, and the derivative of phase-locked frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established.

[0055] Furthermore, based on the inherent parameters and real-time parameters, the derivatives of the active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained, including:

[0056] The active current i is obtained using the following formula. d and reactive current i q :

[0057]

[0058] Where x1' is the derivative of the first digital quantity x1 with respect to time, x2' is the derivative of the second digital quantity x2 with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 These are the reactive power outer loop control parameters;

[0059] The derivatives of the phase-locked angle with respect to time, δ' and ω', are obtained using the following formulas:

[0060]

[0061] Where ω is the phase-locked frequency, ω g k is the frequency of an infinite voltage source. p3 k i3 For phase-locked loop control parameters, u q0 u is the q-axis component of the new energy generator terminal voltage. q0 ' is the time derivative of the q-axis component of the new energy generator terminal voltage.

[0062] Furthermore, based on the voltage amplitude of the infinite voltage source, grid-connected resistance, grid-connected reactance, phase-locked angle, phase-locked frequency, active current, and reactive current, the corrected real-time active power value and the corrected real-time reactive power value are obtained, including:

[0063] The corrected real-time active power P and corrected real-time reactive power Q are obtained using the following formulas:

[0064] P = u d i d +u q i q Q=u q i d -u d i q ;

[0065] Among them, u d For the corrected d-axis component of the new energy generator terminal voltage, u q For the corrected q-axis component of the new energy generator terminal voltage, i d For active current, i q This is reactive current;

[0066] Among them, the d-axis component u of the corrected new energy generator terminal voltage d and the corrected q-axis component u of the new energy generator terminal voltage q The following formula is used to obtain:

[0067]

[0068] Among them, U g Let R be the voltage amplitude of the infinite voltage source, L be the grid resistance, L be the grid reactance, δ be the phase-locked angle, ω be the phase-locked frequency, and i be the voltage amplitude of the infinite voltage source. d For active current, i q This is reactive current.

[0069] Furthermore, based on the corrected real-time active power, corrected real-time reactive power, active current, reactive current, the derivative of the phase-locked loop angle with respect to time, and the derivative of the phase-locked loop frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established, including:

[0070] The following formula is used to obtain the model of the new energy grid-connected system based on transient energy flow:

[0071]

[0072] in,

[0073]

[0074]

[0075] i x =i d cosδ-i q sinδ,i y =i q cosδ+i d sinδ;

[0076]

[0077]

[0078] Among them, i d ' is the derivative of the active current with respect to time, i q' is the derivative of reactive current with respect to time, δ' is the derivative of phase-locked angle with respect to time, ω' is the derivative of phase-locked frequency with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 For reactive power outer loop control parameters, k p3 k i3 Here are the phase-locked loop control parameters, where ω is the phase-locked frequency, δ is the phase-locked angle, and U is the phase-locked loop angle. g Let ω be the voltage amplitude of an infinite voltage source. g R is the frequency of the infinite voltage source, L is the grid resistance, L is the grid reactance, and P is the voltage source. ref Q is the active power reference value. ref P is the reactive power reference value, P is the corrected real-time active power value, and Q is the corrected real-time reactive power value.

[0079] Specifically, the derivative values ​​x1' of the first digital quantity x1 with respect to time and x2' of the second digital quantity x2 with respect to time are calculated using equation (1) as follows:

[0080]

[0081] The active current i is calculated from equation (2). d and reactive current i q :

[0082]

[0083] The derivatives of the phase-locked angle δ with respect to time, δ' and ω' of the phase-locked frequency ω with respect to time, are calculated using equation (3):

[0084]

[0085] Based on the voltage amplitude U of the infinite voltage source g Grid-connected resistor R, grid-connected reactance L, phase-locked angle δ, phase-locked frequency ω, active current i d reactive current i q Calculate the d-axis component u of the corrected new energy vehicle terminal voltage. d q-axis component u of the terminal voltage q The corrected real-time active power value P and the corrected real-time reactive power value Q. The specific process is as follows:

[0086]

[0087] P = u d i d +u q i q Q = u q i d -ud i q (5)

[0088] The derivative of the active current i is calculated based on Equation 2. d 'and the derivative of reactive current i q Substitute the calculation results and Formula 5 into Formula 3. The differential relationships between the state variables of the model can be obtained as follows:

[0089] ω′=E7+E5i d ′+E6i q ′ (6)

[0090] In the formula, E5 represents the effect of the active current change rate on the frequency change rate, E6 represents the effect of the reactive current change rate on the frequency change rate, and E7 represents the effect of the phase-locked angle change rate on the frequency change rate. The expressions for the above terms are as follows:

[0091]

[0092]

[0093] Based on the preceding calculations, the differential equations for the new energy grid-connected system model based on transient energy flow are as follows:

[0094]

[0095] In the formula, the parameters are as follows:

[0096]

[0097]

[0098]

[0099] i x =i d cosδ-i q sinδ, i y =i q cosδ+i d sinδ (13)

[0100] In the above embodiments, the established new energy grid-connected system model based on transient energy flow has clear physical meaning and provides an important reference for understanding the transient instability process and its interactive coupling relationship.

[0101] Step S103: Based on the new energy grid-connected system model, obtain the transient energy flow corresponding to each control link.

[0102] Further, step S103 includes:

[0103] Based on the new energy grid-connected system model, the first energy flow Inflow1, the second energy flow Inflow2, the third energy flow Inflow3, the fourth energy flow Inflow4, and the fifth energy flow Inflow5 are obtained as follows:

[0104]

[0105]

[0106]

[0107]

[0108]

[0109] Specifically, the first energy flow, Inflow1, is related to the instability of the active outer loop. It can be obtained through formula (12):

[0110]

[0111] The second energy flow, Inflow2, is related to the instability of the reactive outer loop. It can be obtained through formula (12):

[0112]

[0113] The third energy flow, Inflow3, is related to PLL instability. It can be obtained through formulas (9) and (13):

[0114]

[0115] The fourth energy flow, Inflow4, is related to the active power interaction between the power grid and new energy sources. It can be obtained through formulas (9) and (12):

[0116]

[0117] The fifth energy flow, Inflow5, is related to the reactive power interaction between the power grid and new energy sources. It can be obtained through formulas (9) and (12):

[0118]

[0119] Step S104: Identify the dominant transient instability link of the new energy grid-connected system based on the transient energy flow corresponding to each control link.

[0120] Further, step S104 includes:

[0121] After a fault disturbance, if the time-domain waveform of the first energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the active outer loop.

[0122] If the time-domain waveform of the second energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the reactive power outer loop.

[0123] Third, if the time-domain waveform of the energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the PLL;

[0124] If the time-domain waveform of the fourth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the active power interaction between the grid and the new energy power source.

[0125] If the time-domain waveform of the fifth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability of the new energy grid-connected system is caused by reactive power interaction between the grid and the new energy power source.

[0126] The above embodiments establish a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters. Based on the new energy grid-connected system model, the transient energy flow corresponding to each control link is obtained. Based on the transient energy flow corresponding to each control link, the dominant transient instability link of the new energy grid-connected system is identified. This can accurately locate the dominant link and process of transient instability under large grid disturbances, thus providing a clear research object for subsequent parameter optimization, control strategy improvement and other work.

[0127] Figure 3 A schematic diagram of a new energy fault crossing instability identification device according to an embodiment of the present invention is shown.

[0128] like Figure 3 As shown, the new energy fault crossing instability identification device includes:

[0129] The acquisition unit 301 is used to acquire the inherent parameters and real-time parameters of the new energy grid-connected system.

[0130] Modeling unit 302 is used to establish a new energy grid-connected system model based on transient energy flow according to inherent parameters and real-time parameters;

[0131] The processing unit 303 is used to obtain the transient energy flow corresponding to each control link based on the new energy grid-connected system model;

[0132] The identification unit 304 is used to identify the dominant transient instability link of the new energy grid-connected system based on the transient energy flow corresponding to each control link.

[0133] Furthermore, the inherent parameters include: active reference value, reactive reference value, active outer loop control parameters, reactive outer loop control parameters, phase-locked loop control parameters, grid-connected resistance, grid-connected reactance, voltage amplitude of the infinite voltage source, and frequency of the infinite voltage source;

[0134] Real-time parameters include: real-time active power, real-time reactive power, phase-locked angle, phase-locked frequency, first digital quantity, second digital quantity, and the q-axis component of the new energy generator terminal voltage and the derivative of the q-axis component with respect to time.

[0135] Furthermore, modeling unit 302 is also used for:

[0136] Based on the inherent parameters and real-time parameters, the derivative values ​​of active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained.

[0137] Based on the voltage amplitude of the infinite voltage source, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current, the corrected real-time active value and the corrected real-time reactive value are obtained.

[0138] Based on the corrected real-time active power, corrected real-time reactive power, active current, reactive current, the derivative of phase-locked angle with respect to time, and the derivative of phase-locked frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established.

[0139] Furthermore, based on the inherent parameters and real-time parameters, the derivatives of the active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained, including:

[0140] The active current i is obtained using the following formula. d and reactive current i q :

[0141]

[0142] Where x1' is the derivative of the first digital quantity x1 with respect to time, x2' is the derivative of the second digital quantity x2 with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 These are the reactive power outer loop control parameters;

[0143] The derivatives of the phase-locked angle with respect to time, δ' and ω', are obtained using the following formulas:

[0144]

[0145] Where ω is the phase-locked frequency, ω g k is the frequency of an infinite voltage source.p3 k i3 For phase-locked loop control parameters, u q0 u is the q-axis component of the new energy generator terminal voltage. q0 ' is the time derivative of the q-axis component of the new energy generator terminal voltage.

[0146] Furthermore, based on the voltage amplitude of the infinite voltage source, grid-connected resistance, grid-connected reactance, phase-locked angle, phase-locked frequency, active current, and reactive current, the corrected real-time active power value and the corrected real-time reactive power value are obtained, including:

[0147] The corrected real-time active power P and corrected real-time reactive power Q are obtained using the following formulas:

[0148] P = u d i d +u q i q Q=u q i d -u d i q ;

[0149] Among them, u d For the corrected d-axis component of the new energy generator terminal voltage, u q For the corrected q-axis component of the new energy generator terminal voltage, i d For active current, i q This is reactive current;

[0150] Among them, the d-axis component u of the corrected new energy generator terminal voltage d and the corrected q-axis component u of the new energy generator terminal voltage q The following formula is used to obtain:

[0151]

[0152] Among them, U g Let R be the voltage amplitude of the infinite voltage source, L be the grid resistance, L be the grid reactance, δ be the phase-locked angle, ω be the phase-locked frequency, and i be the voltage amplitude of the infinite voltage source. d For active current, i q This is reactive current.

[0153] Furthermore, based on the corrected real-time active power, corrected real-time reactive power, active current, reactive current, the derivative of the phase-locked loop angle with respect to time, and the derivative of the phase-locked loop frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established, including:

[0154] The following formula is used to obtain the model of the new energy grid-connected system based on transient energy flow:

[0155]

[0156] in,

[0157]

[0158]

[0159] i x =i d cosδ-i q sinδ,i y =i q cosδ+i d sinδ;

[0160]

[0161]

[0162] Among them, i d ' is the derivative of the active current with respect to time, i q ' is the derivative of reactive current with respect to time, δ' is the derivative of phase-locked angle with respect to time, ω' is the derivative of phase-locked frequency with respect to time, and k p1 k i1 For the active outer loop control parameters, k p2 k i2 For reactive power outer loop control parameters, k p3 k i3 Here are the phase-locked loop control parameters, where ω is the phase-locked frequency, δ is the phase-locked angle, and U is the phase-locked loop angle. g Let ω be the voltage amplitude of an infinite voltage source. g R is the frequency of the infinite voltage source, L is the grid resistance, L is the grid reactance, and P is the voltage source. ref Q is the active power reference value. ref P is the reactive power reference value, P is the corrected real-time active power value, and Q is the corrected real-time reactive power value.

[0163] Furthermore, the processing unit 303 is also used for:

[0164] Based on the new energy grid-connected system model, the first energy flow Inflow1, the second energy flow Inflow2, the third energy flow Inflow3, the fourth energy flow Inflow4, and the fifth energy flow Inflow5 are obtained as follows:

[0165]

[0166]

[0167]

[0168]

[0169]

[0170] Furthermore, the identification unit 304 is also used for:

[0171] After a fault disturbance, if the time-domain waveform of the first energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the active outer loop.

[0172] If the time-domain waveform of the second energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the reactive power outer loop.

[0173] Third, if the time-domain waveform of the energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the PLL;

[0174] If the time-domain waveform of the fourth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the active power interaction between the grid and the new energy power source.

[0175] If the time-domain waveform of the fifth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability of the new energy grid-connected system is caused by reactive power interaction between the grid and the new energy power source.

[0176] The above embodiments establish a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters. Based on the new energy grid-connected system model, the transient energy flow corresponding to each control link is obtained. Based on the transient energy flow corresponding to each control link, the dominant transient instability link of the new energy grid-connected system is identified. This can accurately locate the dominant link and process of transient instability under large grid disturbances, thus providing a clear research object for subsequent parameter optimization, control strategy improvement and other work.

[0177] It should be noted that the apparatus provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0178] This invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the new energy fault-crossing instability identification method provided in the above embodiments.

[0179] This invention also provides an electronic device, including: a processor; a memory for storing processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the new energy fault-crossing instability identification method provided in the above embodiments.

[0180] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0181] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0182] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0183] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0184] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0185] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for identifying instability during fault passage in new energy sources, characterized in that, include: Obtain the inherent and real-time parameters of the new energy grid-connected system; Based on the inherent parameters and the real-time parameters, a new energy grid-connected system model based on transient energy flow is established; Based on the aforementioned new energy grid-connected system model, the transient energy flow corresponding to each control link is obtained; Based on the transient energy flow corresponding to each control link, identify the dominant transient instability link of the new energy grid-connected system; The inherent parameters include: active reference value, reactive reference value, active outer loop control parameters, reactive outer loop control parameters, phase-locked loop control parameters, grid-connected resistance, grid-connected reactance, voltage amplitude of the infinite voltage source, and frequency of the infinite voltage source. The real-time parameters include: real-time active power, real-time reactive power, phase-locked angle, phase-locked frequency, first digital quantity, second digital quantity, and the q-axis component of the new energy generator terminal voltage and the derivative of the q-axis component with respect to time. The model for a new energy grid-connected system based on transient energy flow is established according to the inherent parameters and the real-time parameters, including: Based on the inherent parameters and the real-time parameters, the derivative values ​​of active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained. Based on the voltage amplitude, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current of the infinite voltage source, the corrected real-time active value and the corrected real-time reactive value are obtained. Based on the corrected real-time active power value, corrected real-time reactive power value, active current, reactive current, derivative of phase-locked angle with respect to time, and derivative of phase-locked frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established. Specifically, based on the transient energy flow corresponding to each control link, the dominant transient instability link of the new energy grid-connected system is identified, including: After a fault disturbance, if the time-domain waveform of the first energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the active outer loop. If the time-domain waveform of the second energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the reactive power outer loop. If the time-domain waveform of the third energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the PLL; If the time-domain waveform of the fourth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the active power interaction between the grid and the new energy power source. If the time-domain waveform of the fifth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability of the new energy grid-connected system is caused by reactive power interaction between the grid and the new energy power source.

2. The method for identifying instability during new energy fault ride-through according to claim 1, characterized in that, Based on the inherent parameters and the real-time parameters, the derivatives of the active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained, including: The active current is obtained using the following formula. i d and reactive current i q : ； in, x 1 ' The first digital quantity x The derivative with respect to time, x 2 ' For the second digital quantity x The derivative with respect to time, k p1 , k i1 These are the active power outer loop control parameters. k p2 , k i2 These are the reactive power outer loop control parameters; The derivative of the phase-locked angle with respect to time is obtained using the following formula. δ' The derivative of the phase-locked frequency with respect to time ω' : ； in, ω For phase-locked frequency, ω g The frequency of an infinite voltage source k p3 , k i3 These are the phase-locked loop control parameters. u q0 This represents the q-axis component of the voltage at the new energy generator terminals. u q0 ' This represents the time derivative of the q-axis component of the new energy generator terminal voltage.

3. The method for identifying instability during new energy fault ride-through according to claim 2, characterized in that, Based on the voltage amplitude, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current of the infinite voltage source, the corrected real-time active power value and the corrected real-time reactive power value are obtained, including: The corrected real-time active power value is obtained using the following formula. P and the corrected real-time reactive power value Q : ； in, u d This represents the d-axis component of the corrected new energy vehicle terminal voltage. u q This represents the q-axis component of the corrected new energy vehicle terminal voltage. i d For active current, i q This is reactive current; Among them, the d-axis component of the corrected new energy generator terminal voltage u d and the q-axis component of the corrected new energy generator terminal voltage u q The following formula is used to obtain: ； in, U g The voltage amplitude of an infinite voltage source. R For grid connection resistor, L For grid-connected reactors, δ For phase-locked angle, ω For phase-locked frequency, i d For active current, i q This is reactive current.

4. The method for identifying instability during new energy fault ride-through according to claim 3, characterized in that, Based on the corrected real-time active power, corrected real-time reactive power, active current, reactive current, the derivative of the phase-locked loop angle with respect to time, and the derivative of the phase-locked loop frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established, including: The following formula is used to obtain the model of the new energy grid-connected system based on transient energy flow: ； in, ; ； ； ； ； ； in, i d ' This is the derivative of the active current with respect to time. i q ' This represents the derivative of reactive current with respect to time. δ' This is the derivative of the phase-locked angle with respect to time. ω' This is the derivative of the phase-locked frequency with respect to time. k p1 , k i1 These are the active power outer loop control parameters. k p2 , k i2 These are the reactive power outer loop control parameters. k p3 , k i3 These are the phase-locked loop control parameters. ω For phase-locked frequency, δ For phase-locked angle, U g The voltage amplitude of an infinite voltage source. ω g The frequency of an infinite voltage source R For grid connection resistor, L For grid-connected reactors, P ref This is the active power reference value. Q ref This is the reactive power reference value. P This is the corrected real-time active power value. Q This is the corrected real-time reactive power value.

5. The method for identifying instability during new energy fault ride-through according to claim 4, characterized in that, Based on the aforementioned new energy grid-connected system model, the transient energy flow corresponding to each control link is obtained, including: Based on the aforementioned new energy grid-connected system model, the first energy flow Inflow1, the second energy flow Inflow2, the third energy flow Inflow3, the fourth energy flow Inflow4, and the fifth energy flow Inflow5 are obtained as follows: ； ； ； ； 。 6. A device for identifying faults and instability in new energy sources, characterized in that, include: The acquisition unit is used to acquire the inherent and real-time parameters of the new energy grid-connected system. The modeling unit is used to establish a new energy grid-connected system model based on transient energy flow according to the inherent parameters and the real-time parameters. The processing unit is used to obtain the transient energy flow corresponding to each control link based on the new energy grid-connected system model. The identification unit is used to identify the dominant transient instability link of the new energy grid-connected system based on the transient energy flow corresponding to each control link. The inherent parameters include: active reference value, reactive reference value, active outer loop control parameters, reactive outer loop control parameters, phase-locked loop control parameters, grid-connected resistance, grid-connected reactance, voltage amplitude of the infinite voltage source, and frequency of the infinite voltage source. The real-time parameters include: real-time active power, real-time reactive power, phase-locked angle, phase-locked frequency, first digital quantity, second digital quantity, and the q-axis component of the new energy generator terminal voltage and the derivative of the q-axis component with respect to time. The modeling unit is further configured to: Based on the inherent parameters and the real-time parameters, the derivative values ​​of active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained. Based on the voltage amplitude, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current of the infinite voltage source, the corrected real-time active value and the corrected real-time reactive value are obtained. Based on the corrected real-time active power value, corrected real-time reactive power value, active current, reactive current, derivative of phase-locked angle with respect to time, and derivative of phase-locked frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established. The identification unit is further configured to: After a fault disturbance, if the time-domain waveform of the first energy flow first shows a large oscillation or a significant deviation from the rated value, then the dominant transient instability link of the new energy grid-connected system is the active outer loop. If the time-domain waveform of the second energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the reactive power outer loop. If the time-domain waveform of the third energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is the PLL; If the time-domain waveform of the fourth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability link of the new energy grid-connected system is caused by the active power interaction between the grid and the new energy power source. If the time-domain waveform of the fifth energy flow first shows large-amplitude oscillations or significant deviations from the rated value, then the dominant transient instability of the new energy grid-connected system is caused by reactive power interaction between the grid and the new energy power source.

7. The new energy fault-crossing instability identification device according to claim 6, characterized in that, Based on the inherent parameters and the real-time parameters, the derivatives of the active current, reactive current, phase-locked angle with respect to time, and phase-locked frequency with respect to time are obtained, including: The active current is obtained using the following formula. i d and reactive current i q : ； in, x 1 ' The first digital quantity x The derivative with respect to time, x 2 ' For the second digital quantity x The derivative with respect to time, k p1 , k i1 These are the active power outer loop control parameters. k p2 , k i2 These are the reactive power outer loop control parameters; The derivative of the phase-locked angle with respect to time is obtained using the following formula. δ' The derivative of the phase-locked frequency with respect to time ω' : ； in, ω For phase-locked frequency, ω g The frequency of an infinite voltage source k p3 , k i3 These are the phase-locked loop control parameters. u q0 This represents the q-axis component of the voltage at the new energy generator terminals. u q0 ' This represents the time derivative of the q-axis component of the new energy generator terminal voltage.

8. The new energy fault-crossing instability identification device according to claim 7, characterized in that, Based on the voltage amplitude, grid resistance, grid reactance, phase-locked angle, phase-locked frequency, active current, and reactive current of the infinite voltage source, the corrected real-time active power value and the corrected real-time reactive power value are obtained, including: The corrected real-time active power value is obtained using the following formula. P and the corrected real-time reactive power value Q : ； in, u d This represents the d-axis component of the corrected new energy vehicle terminal voltage. u q This represents the q-axis component of the corrected new energy vehicle terminal voltage. i d For active current, i q This is reactive current; Among them, the d-axis component of the corrected new energy generator terminal voltage u d and the q-axis component of the corrected new energy generator terminal voltage u q The following formula is used to obtain: ； in, U g The voltage amplitude of an infinite voltage source. R For grid connection resistor, L For grid-connected reactors, δ For phase-locked angle, ω For phase-locked frequency, i d For active current, i q This is reactive current.

9. The new energy fault-crossing instability identification device according to claim 8, characterized in that, Based on the corrected real-time active power, corrected real-time reactive power, active current, reactive current, the derivative of the phase-locked loop angle with respect to time, and the derivative of the phase-locked loop frequency with respect to time, a new energy grid-connected system model based on transient energy flow is established, including: The following formula is used to obtain the model of the new energy grid-connected system based on transient energy flow: ； in, ; ； ； ； ； ； in, i d ' This is the derivative of the active current with respect to time. i q ' This represents the derivative of reactive current with respect to time. δ' This is the derivative of the phase-locked angle with respect to time. ω' This is the derivative of the phase-locked frequency with respect to time. k p1 , k i1 These are the active power outer loop control parameters. k p2 , k i2 These are the reactive power outer loop control parameters. k p3 , k i3 These are the phase-locked loop control parameters. ω For phase-locked frequency, δ For phase-locked angle, U g The voltage amplitude of an infinite voltage source. ω g The frequency of an infinite voltage source R For grid connection resistor, L For grid-connected reactors, P ref This is the active power reference value. Q ref This is the reactive power reference value. P This is the corrected real-time active power value. Q This is the corrected real-time reactive power value.

10. The new energy fault-crossing instability identification device according to claim 9, wherein the processing unit is further configured to: Based on the aforementioned new energy grid-connected system model, the first energy flow Inflow1, the second energy flow Inflow2, the third energy flow Inflow3, the fourth energy flow Inflow4, and the fifth energy flow Inflow5 are obtained as follows: ； ； ； ； 。 11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the new energy fault crossing instability identification method as described in any one of claims 1-5.

12. An electronic device, comprising: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the new energy fault crossing instability identification method according to any one of claims 1-5.

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