Fault ride-through test method and device for high voltage ride-through of new energy equipment

Abstract

The invention provides a fault ride-through test method and device for high voltage ride-through of new energy equipment, and relates to the technical field of fault test. The method comprises the following steps: according to an equivalent impedance parameter of a new energy system, a pre-configured short-circuit resistance and a lifting depth of high voltage ride through, calculating to obtain a capacitance parameter changing corresponding to the short-circuit resistance; according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance, the operation state of the grid-connected point voltage in the high voltage ride-through period is determined; and determining a first expression of a grid-connected point transient voltage according to the operation state, calculating a first grid-connected point transient voltage variation according to the first expression and the configuration value of the short-circuit resistor, and taking the first grid-connected point transient voltage variation as a fault ride-through test result. The device executes the method. According to the method and the device provided by the embodiment of the invention, the fault ride-through test of the high voltage ride-through of the new energy equipment can be comprehensively carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of fault testing, and in particular to a fault ride-through testing method and device for high voltage ride-through of new energy equipment. Background Art

[0002] The high voltage ride-through fault ride-through test of new energy equipment is an important test item that needs to be carried out for the grid connection of new energy equipment. To carry out the fault ride-through test of new energy equipment, it is necessary to configure the corresponding no-load short-circuit impedance parameters at the grid connection point of the new energy equipment.

[0003] At present, the short-circuit impedance parameter configuration method under the high voltage ride-through fault ride-through test of new energy equipment is to convert the short-circuit impedance parameter through the voltage drop ratio. This method only takes into account the steady-state voltage drop of new energy equipment, so it is impossible to achieve a comprehensive high voltage ride-through fault ride-through test of new energy equipment. Summary of the invention

[0004] In view of the problems in the prior art, an embodiment of the present invention provides a fault ride-through test method and device for high voltage ride-through of new energy equipment, which can at least partially solve the problems existing in the prior art.

[0005] On the one hand, the present invention provides a fault ride-through test method for high voltage ride-through of new energy equipment, comprising:

[0006] According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0007] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0008] Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0009] A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

[0010] The equivalent impedance parameters of the new energy system include resistance parameters and reactance parameters; accordingly, the capacitance parameters corresponding to the short-circuit resistance are calculated based on the equivalent impedance parameters of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, including:

[0011] Calculating an intermediate resistance according to the short-circuit resistance, the resistance parameter and the elevation depth;

[0012] The capacitance parameter is calculated according to the intermediate resistance, the reactance parameter, the short-circuit resistance, the resistance parameter and the elevation depth.

[0013] Wherein, the reactance parameters include angular frequency ω and inductance; accordingly, determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance includes:

[0014] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an underdamped operating state:

[0015]

[0016] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an over-damped operating state:

[0017]

[0018] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be a critical damping operating state:

[0019]

[0020] Among them, R x is the short-circuit resistance, C x is the capacitance parameter, R s is the resistance parameter, L s is the inductor.

[0021] Wherein, the first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0022] u1(t)=u c1 (t)+u r1 (t)

[0023]

[0024] Wherein, u1(t) is the transient voltage at the grid connection point corresponding to the underdamped operating state, u c1 (t) is the capacitor voltage corresponding to the underdamped operating state, u r1 (t) is the resistance voltage corresponding to the underdamped operating state,

[0025]

[0026] Wherein, the first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0027] u2(t)=u c2 (t)+u r2 (t)

[0028]

[0029] Wherein, u2(t) is the transient voltage at the grid connection point corresponding to the over-damped operating state, u c2 (t) is the capacitor voltage corresponding to the overdamped operating state, u r2 (t) is the resistance voltage corresponding to the overdamped operating state,

[0030]

[0031] Wherein, the first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0032] u3(t)=u c3 (t)+u r3 (t)

[0033]

[0034] Wherein, u3(t) is the transient voltage at the grid connection point corresponding to the critical damping operation state, u c3 (t) is the capacitor voltage corresponding to the critical damping operation state, u r3 (t) is the resistance voltage corresponding to the critical damping operation state, A3=M, A4=α4×MN.

[0035] The fault ride-through test method for high voltage ride-through of new energy equipment further includes:

[0036] Determine a second expression for the transient voltage at the grid connection point during the period of exiting the high voltage ride-through, calculate the transient voltage change at the second grid connection point based on the second expression, the configured value of the short-circuit resistor and the predetermined no-load equivalent impedance of the new energy equipment branch, and use the transient voltage change to the second grid connection point as the fault ride-through test result.

[0037] On the one hand, the present invention provides a fault ride-through test device for high voltage ride-through of new energy equipment, comprising:

[0038] A calculation unit, configured to calculate a capacitance parameter corresponding to the change in the short-circuit resistance according to an equivalent impedance parameter of the new energy system and a pre-configured short-circuit resistance and a heightening depth of the high voltage ride-through;

[0039] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0040] A determination unit, configured to determine an operating state of the grid connection point voltage during high voltage ride-through according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0041] The test unit is used to determine a first expression of the transient voltage of the grid connection point according to the operating state, calculate the transient voltage change of the first grid connection point according to the first expression and the configured value of the short-circuit resistor, and use the transient voltage change of the first grid connection point as the fault ride-through test result.

[0042] In another aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, and a bus, wherein:

[0043] The processor and the memory communicate with each other via the bus;

[0044] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the following method:

[0045] According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0046] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0047] Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0048] A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

[0049] An embodiment of the present invention provides a non-transitory computer-readable storage medium, including:

[0050] The non-transitory computer-readable storage medium stores computer instructions, which cause the computer to execute the following method:

[0051] According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0052] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0053] Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0054] A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

[0055] The fault ride-through test method and device for high voltage ride-through of new energy equipment provided in the embodiments of the present invention calculate the capacitance parameter that changes corresponding to the short-circuit resistance according to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through; wherein the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through; according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance, determine the operating state of the grid connection point voltage during the high voltage ride-through period; determine the first expression of the grid connection point transient voltage according to the operating state, calculate the first grid connection point transient voltage change according to the first expression and the configured value of the short-circuit resistance, and use the first grid connection point transient voltage change as the fault ride-through test result, so as to realize comprehensive fault ride-through test of high voltage ride-through of new energy equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0057] Figure 1 It is a flow chart of a fault ride-through test method for high voltage ride-through of new energy equipment provided by an embodiment of the present invention.

[0058] Figure 2 It is a schematic diagram of an equivalent circuit of a high voltage ride-through fault of a new energy device provided by an embodiment of the present invention.

[0059] Figure 3 It is a flow chart of a fault ride-through test method for high voltage ride-through of new energy equipment provided by another embodiment of the present invention.

[0060] Figure 4 It is a flow chart of a fault ride-through test method for high voltage ride-through of new energy equipment provided by another embodiment of the present invention.

[0061] Figure 5It is a structural schematic diagram of a fault ride-through test device for high voltage ride-through of new energy equipment provided by an embodiment of the present invention.

[0062] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0064] Figure 1 FIG. 1 is a flow chart of a fault ride-through test method for high voltage ride-through of new energy equipment provided by an embodiment of the present invention. Figure 1 As shown, the fault ride-through test method of high voltage ride-through of new energy equipment provided by the embodiment of the present invention includes:

[0065] Step S1: according to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0066] The short-circuit resistance is a short-circuit resistance of a fault ride-through test of a high voltage ride-through.

[0067] Step S2: determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance.

[0068] Step S3: Determine a first expression of the transient voltage of the grid connection point according to the operating state, calculate a first grid connection point transient voltage change according to the first expression and the configured value of the short-circuit resistor, and use the first grid connection point transient voltage change as a fault ride-through test result.

[0069] In the above step S1, the device calculates the capacitance parameter corresponding to the short-circuit resistance according to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through;

[0070] The short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through. The device may be a computer device for executing the method. It should be noted that the acquisition and analysis of data involved in the embodiment of the present invention is authorized by the user. Figure 2 As shown, the high voltage ride-through fault equivalent circuit of new energy equipment includes system equivalent voltage and system equivalent impedance.

[0071] The system equivalent voltage can be obtained through large power grid simulation, and the system voltage amplitude and phase remain stable. The system equivalent voltage can be expressed as

[0072] Among them, U s is the voltage amplitude, ω×t is the phase, α us is the system equivalent voltage phase angle, which can be set to 0, and ω is the angular frequency, which is 314.

[0073] The system equivalent impedance is the external equivalent impedance parameter of the grid connection point of the new energy equipment. The system equivalent impedance can be expressed as

[0074] Among them, the system short-circuit current α is is the system equivalent current phase angle, I s is the current amplitude.

[0075] Impedance amplitude |Z|=sqrt(R s ×R s +ω×ω×L s ×L s ).

[0076] Assuming the system impedance ratio You can get R s =|Z|×sqrt(1+k 2 ), L s =|Z|×sqrt(1+k 2 )×k / ω.

[0077] Assume that the short-circuit resistance of the high voltage ride-through fault test is set to R x , the capacitance parameter is C x , the no-load equivalent impedance of the new energy equipment branch is R ∞ It is generally believed that R ∞ is a value close to infinity. In the actual test process, there is a no-load weak current situation, so it is considered that R ∞ It is a very large value.

[0078] The height increase depth of high voltage ride-through is k′, and during the high voltage ride-through of the new energy equipment unit, the values ​​are 1.2, 1.25, and 1.3 respectively.

[0079] The new energy system equivalent impedance parameter includes a resistance parameter and a reactance parameter; accordingly, the capacitance parameter corresponding to the change of the short-circuit resistance is calculated according to the new energy system equivalent impedance parameter and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, including:

[0080] The intermediate resistance is calculated according to the short-circuit resistance, the resistance parameter and the elevation depth; the intermediate resistance is denoted as R.

[0081] The capacitance parameter is calculated according to the intermediate resistance, the reactance parameter, the short-circuit resistance, the resistance parameter and the elevation depth.

[0082] The short circuit resistance is R x , the capacitance parameter is C x , and the system impedance R s +jωL s It is related to the value of k′ and satisfies the following constraints:

[0083]

[0084] Let R = R x 2 -k′ 2 ×(R s +R x ) 2 , and get the coefficient b = -2 × k′ 2 ×L s ×ω 2 , c = k′ 2 -1, further confirmation

[0085] Therefore, in determining R x After that, the intermediate resistance R and coefficients a, b and c can be obtained through the constraint relationship, and then the capacitance parameter C can be determined x .

[0086] In the above step S2, the device determines the operating state of the grid connection point voltage during the high voltage ride through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance. The reactance parameter includes the angular frequency ω and the inductance; accordingly, the determining the operating state of the grid connection point voltage during the high voltage ride through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance includes:

[0087] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an underdamped operating state:

[0088]

[0089] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an over-damped operating state:

[0090]

[0091] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be a critical damping operating state:

[0092]

[0093] Among them, R x is the short-circuit resistance, C x is the capacitance parameter, R s is the resistance parameter, L s is the inductor.

[0094] In the above step S3, the device determines a first expression of the transient voltage of the grid connection point according to the operating state, calculates a first transient voltage change of the grid connection point according to the first expression and the configured value of the short-circuit resistor, and uses the first transient voltage change of the grid connection point as the fault ride-through test result. The first expression of the transient voltage of the grid connection point determined according to the operating state includes:

[0095] u1(t)=u c1 (t)+u r1 (t)

[0096]

[0097] Wherein, u1(t) is the transient voltage at the grid connection point corresponding to the underdamped operating state, u c1 (t) is the capacitor voltage corresponding to the underdamped operating state, u r1 (t) is the resistance voltage corresponding to the underdamped operating state,

[0098] The first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0099] u2(t)=u c2 (t)+u r2 (t)

[0100]

[0101] Wherein, u2(t) is the transient voltage at the grid connection point corresponding to the over-damped operating state, u c2 (t) is the capacitor voltage corresponding to the overdamped operating state, u r2 (t) is the resistance voltage corresponding to the overdamped operating state,

[0102]

[0103] The first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0104] u3(t)=u c3 (t)+u r3 (t)

[0105]

[0106] Wherein, u3(t) is the transient voltage at the grid connection point corresponding to the critical damping operation state, u c3 (t) is the capacitor voltage corresponding to the critical damping operation state, u r3 (t) is the resistance voltage corresponding to the critical damping operation state, A3=M, A4=α4×MN.

[0107] The fault ride-through test method for high voltage ride-through of new energy equipment also includes:

[0108] Determine a second expression for the transient voltage at the grid connection point during the period of exiting the high voltage ride-through, calculate the transient voltage change at the second grid connection point based on the second expression, the configured value of the short-circuit resistor and the predetermined no-load equivalent impedance of the new energy equipment branch, and use the transient voltage change to the second grid connection point as the fault ride-through test result.

[0109] The second expression for determining the transient voltage of the grid connection point during the period of exiting the high voltage ride-through includes:

[0110]

[0111] Wherein, u4(t) is the transient voltage of the grid connection point during the period of exiting the high voltage ride-through, U s is the voltage amplitude, α is the voltage phase of the system voltage source at the time of exiting the high voltage ride-through, which can generally be 0, R ∞ is the no-load equivalent impedance of the new energy equipment branch, represents the decay time constant,

[0112] like Figure 3 As shown, the parameter configuration process of the method of the present invention is described. Figure 4 As shown, the testing method flow of the method of the present invention is described.

[0113] The fault ride-through test method for high voltage ride-through of new energy equipment provided by the embodiment of the present invention can set different system resistance and system inductance parameters when the external equivalent system network of the new energy equipment grid connection point is obtained. When different system resistance and system inductance parameters are obtained, according to the voltage drop amplitude requirements of the new energy high voltage ride-through fault ride-through test, multiple groups of short-circuit resistance and capacitance parameters under no-load high voltage ride-through faults and short-circuit resistance and inductance parameters set under no-load low voltage ride-through faults can be designed through the algorithm formula of the present invention. In order to evaluate the transient voltage impact caused by short-circuit impedance parameters under different high voltage ride-through faults, the algorithm formula of the present invention can determine the impact of different short-circuit impedance parameters on the grid-connected voltage waveform amplitude of new energy equipment and the over-damping, under-damping and critical damping states of the grid under no-load conditions, and thus accurately evaluate the impact of high voltage ride-through fault ride-through test parameters on the grid-connected voltage of new energy equipment.

[0114] The fault ride-through test method for high voltage ride-through of new energy equipment provided in an embodiment of the present invention calculates a capacitance parameter that changes corresponding to the short-circuit resistance according to an equivalent impedance parameter of the new energy system and a pre-configured short-circuit resistance and a heightening depth of the high voltage ride-through; wherein the short-circuit resistance is a short-circuit resistance for a fault ride-through test of high voltage ride-through; according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance, determines the operating state of the grid connection point voltage during the high voltage ride-through period; according to the operating state, determines a first expression for the transient voltage of the grid connection point, calculates a first grid connection point transient voltage change according to the first expression and the configured value of the short-circuit resistance, and uses the first grid connection point transient voltage change as a fault ride-through test result, thereby enabling comprehensive fault ride-through testing of high voltage ride-through of new energy equipment.

[0115] Further, the new energy system equivalent impedance parameter includes a resistance parameter and a reactance parameter; accordingly, the capacitance parameter corresponding to the change of the short-circuit resistance is calculated according to the new energy system equivalent impedance parameter and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, including:

[0116] The intermediate resistance is calculated according to the short-circuit resistance, the resistance parameter and the elevation depth; the above description may be referred to in detail in the above embodiment and will not be repeated herein.

[0117] The capacitance parameter is calculated based on the intermediate resistance, the reactance parameter, the short-circuit resistance, the resistance parameter and the elevation depth. The above description can be made with reference to the above embodiment and will not be repeated here.

[0118] Further, the reactance parameters include angular frequency ω and inductance; accordingly, determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance includes:

[0119] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an underdamped operating state:

[0120]

[0121] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an over-damped operating state:

[0122]

[0123] If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be a critical damping operating state:

[0124]

[0125] Among them, R x is the short-circuit resistance, C x is the capacitance parameter, R s is the resistance parameter, L s The inductor can be described with reference to the above embodiment and will not be described in detail.

[0126] Furthermore, the first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0127] u1(t)=u c1 (t)+u r1 (t)

[0128]

[0129] Wherein, u1(t) is the transient voltage at the grid connection point corresponding to the underdamped operating state, u c1 (t) is the capacitor voltage corresponding to the underdamped operating state, u r1 (t) is the resistance voltage corresponding to the underdamped operating state,

[0130] Please refer to the above embodiments for description and no further details will be given.

[0131] Furthermore, the first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0132] u2(t)=u c2(t)+u r2 (t)

[0133]

[0134] Wherein, u2(t) is the transient voltage at the grid connection point corresponding to the over-damped operating state, u c2 (t) is the capacitor voltage corresponding to the overdamped operating state, u r2 (t) is the resistance voltage corresponding to the overdamped operating state,

[0135] Please refer to the above embodiments for description and no further details will be given.

[0136] Furthermore, the first expression for determining the transient voltage of the grid connection point according to the operating state includes:

[0137] u3(t)=u c3 (t)+u r3 (t)

[0138]

[0139] Wherein, u3(t) is the transient voltage at the grid connection point corresponding to the critical damping operation state, u c3 (t) is the capacitor voltage corresponding to the critical damping operation state, u r3 (t) is the resistance voltage corresponding to the critical damping operation state, A3=M, A4=α4×MN. Please refer to the above embodiment for explanation, which will not be described in detail.

[0140] Furthermore, the fault ride-through test method for high voltage ride-through of new energy equipment also includes:

[0141] Determine a second expression of the transient voltage of the grid connection point during the exit of the high voltage ride-through period, calculate the transient voltage change of the second grid connection point according to the second expression, the configuration value of the short-circuit resistor and the predetermined no-load equivalent impedance of the new energy equipment branch, and use the transient voltage change to the second grid connection point as the fault ride-through test result. The above-mentioned embodiment can be referred to for explanation and will not be repeated here.

[0142] Figure 5 FIG. 1 is a schematic diagram of a fault ride-through test device for high voltage ride-through of new energy equipment provided by an embodiment of the present invention. Figure 5 As shown, the fault ride-through test device for high voltage ride-through of new energy equipment provided by the embodiment of the present invention includes a calculation unit 501, a determination unit 502 and a test unit 503, wherein:

[0143] The calculation unit 501 is used to calculate the capacitance parameter that changes corresponding to the short-circuit resistance according to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through; wherein the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through; the determination unit 502 is used to determine the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance; the test unit 503 is used to determine the first expression of the grid connection point transient voltage according to the operating state, calculate the first grid connection point transient voltage change according to the first expression and the configured value of the short-circuit resistance, and use the first grid connection point transient voltage change as the fault ride-through test result.

[0144] Specifically, the calculation unit 501 in the device is used to calculate the capacitance parameter that changes corresponding to the short-circuit resistance according to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through; wherein the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through; the determination unit 502 is used to determine the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance; the test unit 503 is used to determine the first expression of the transient voltage of the grid connection point according to the operating state, and calculate the first grid connection point transient voltage change according to the first expression and the configured value of the short-circuit resistance, and use the first grid connection point transient voltage change as the fault ride-through test result.

[0145] The fault ride-through test device for high voltage ride-through of new energy equipment provided in an embodiment of the present invention calculates a capacitance parameter that changes corresponding to the short-circuit resistance according to an equivalent impedance parameter of a new energy system and a pre-configured short-circuit resistance and a heightening depth of high voltage ride-through; wherein the short-circuit resistance is a short-circuit resistance for a fault ride-through test of high voltage ride-through; according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance, determines the operating state of the grid connection point voltage during the period of entering the high voltage ride-through; according to the operating state, determines a first expression for the transient voltage of the grid connection point, calculates a first grid connection point transient voltage change according to the first expression and the configured value of the short-circuit resistance, and uses the first grid connection point transient voltage change as a fault ride-through test result, thereby enabling comprehensive fault ride-through testing of high voltage ride-through of new energy equipment.

[0146] The embodiment of the present invention provides an embodiment of a fault ride-through test device for high voltage ride-through of new energy equipment, which can be specifically used to execute the processing flow of the above-mentioned method embodiments. Its functions are not repeated here, and reference can be made to the detailed description of the above-mentioned method embodiments.

[0147] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention, such as Figure 6 As shown, the electronic device includes: a processor (processor) 601, a memory (memory) 602 and a bus 603;

[0148] The processor 601 and the memory 602 communicate with each other via a bus 603;

[0149] The processor 601 is used to call the program instructions in the memory 602 to execute the methods provided by the above method embodiments, for example, including:

[0150] According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0151] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0152] Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0153] A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

[0154] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the methods provided by the above method embodiments, for example, including:

[0155] According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0156] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0157] Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0158] A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

[0159] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein the computer program enables the computer to execute the methods provided by the above method embodiments, for example, including:

[0160] According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated;

[0161] Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through;

[0162] Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance;

[0163] A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

[0164] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented 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.

[0165] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0166] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0167] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0168] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0169] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fault ride-through test method for high voltage ride-through of new energy equipment, characterized in that: include: According to the equivalent impedance parameter of the new energy system and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, a capacitance parameter corresponding to the change of the short-circuit resistance is calculated; Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through; Determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance; A first expression of the transient voltage at the grid connection point is determined according to the operating state, and a first transient voltage change at the grid connection point is calculated according to the first expression and the configured value of the short-circuit resistor, and the first transient voltage change at the grid connection point is used as a fault ride-through test result.

2. The fault ride-through test method for high voltage ride-through of new energy equipment according to claim 1, characterized in that: The new energy system equivalent impedance parameter includes a resistance parameter and a reactance parameter; accordingly, the capacitance parameter corresponding to the change of the short-circuit resistance is calculated according to the new energy system equivalent impedance parameter and the pre-configured short-circuit resistance and the elevation depth of the high voltage ride-through, including: Calculating an intermediate resistance according to the short-circuit resistance, the resistance parameter and the elevation depth; The capacitance parameter is calculated according to the intermediate resistance, the reactance parameter, the short-circuit resistance, the resistance parameter and the elevation depth.

3. The fault ride-through test method for high voltage ride-through of new energy equipment according to claim 2, characterized in that: The reactance parameters include angular frequency ω and inductance; accordingly, determining the operating state of the grid connection point voltage during the high voltage ride-through period according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance includes: If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an underdamped operating state: If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be an over-damped operating state: If it is determined that the short-circuit resistance satisfies the following expression, then the operating state is determined to be a critical damping operating state: Among them, R x is the short-circuit resistance, C x is the capacitance parameter, R s is the resistance parameter, L s is the inductor.

4. The fault ride-through test method for high voltage ride-through of new energy equipment according to claim 3, characterized in that: The first expression for determining the transient voltage of the grid connection point according to the operating state includes: u1(t)=u c1 (t)+u r1 (t) Wherein, u1(t) is the transient voltage at the grid connection point corresponding to the underdamped operating state, u c1 (t) is the capacitor voltage corresponding to the underdamped operating state, u r1 (t) is the resistance voltage corresponding to the underdamped operating state, 5. The fault ride-through test method for high voltage ride-through of new energy equipment according to claim 4, characterized in that: The first expression for determining the transient voltage of the grid connection point according to the operating state includes: u2(t)=u c2 (t)+u r2 (t) Wherein, u2(t) is the transient voltage at the grid connection point corresponding to the over-damped operating state, u c2 (t) is the capacitor voltage corresponding to the overdamped operating state, u r2 (t) is the resistance voltage corresponding to the overdamped operating state, 6. The fault ride-through test method for high voltage ride-through of new energy equipment according to claim 5, characterized in that: The first expression for determining the transient voltage of the grid connection point according to the operating state includes: u3(t)=u c3 (t)+u r3 (t) Wherein, u3(t) is the transient voltage at the grid connection point corresponding to the critical damping operation state, u c3 (t) is the capacitor voltage corresponding to the critical damping operation state, u r3 (t) is the resistance voltage corresponding to the critical damping operation state, A3=M, A4=α4×MN.

7. The fault ride-through test method for high voltage ride-through of new energy equipment according to any one of claims 1 to 6, characterized in that: The fault ride-through test method for high voltage ride-through of new energy equipment also includes: Determine a second expression for the transient voltage at the grid connection point during the period of exiting the high voltage ride-through, calculate the transient voltage change at the second grid connection point based on the second expression, the configured value of the short-circuit resistor and the predetermined no-load equivalent impedance of the new energy equipment branch, and use the transient voltage change to the second grid connection point as the fault ride-through test result.

8. A fault ride-through test device for high voltage ride-through of new energy equipment, characterized in that: include: A calculation unit, configured to calculate a capacitance parameter corresponding to the change in the short-circuit resistance according to an equivalent impedance parameter of the new energy system and a pre-configured short-circuit resistance and a heightening depth of the high voltage ride-through; Wherein, the short-circuit resistance is the short-circuit resistance of the fault ride-through test of the high voltage ride-through; A determination unit, configured to determine an operating state of the grid connection point voltage during high voltage ride-through according to the capacitance parameter, the equivalent impedance parameter of the new energy system and the short-circuit resistance; The test unit is used to determine a first expression of the transient voltage of the grid connection point according to the operating state, calculate the transient voltage change of the first grid connection point according to the first expression and the configured value of the short-circuit resistor, and use the transient voltage change of the first grid connection point as the fault ride-through test result.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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