Power electronic equipment control method and system suitable for new energy grid connection

Abstract

The invention provides a power electronic equipment control method and system suitable for new energy grid connection, and relates to the technical field of new energy grid connection, and the method comprises the steps: obtaining a current value and a voltage value of power electronic equipment suitable for new energy grid connection; according to the current value and the position of the power electronic equipment in the power system, a fault judgment basis corresponding to the position is adopted, and a fault input and quit result of the power electronic equipment is determined; setting an integral stop state of the power electronic equipment according to the fault state range of the fault input and exit result; according to the position and the fault input and exit result, the maximum limiting current during fault ride-through of the power electronic equipment is set; and when the voltage value exceeds the preset voltage range, performing voltage amplitude limiting on the voltage value by combining the positive and negative sequence voltage instruction values, thereby realizing fault ride-through control on the electronic equipment. According to the invention, the amplitude of voltage and current is controlled by combining the fault judgment basis of power electronic equipment during new energy grid connection, and efficient and reliable new energy grid connection is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy grid connection, and in particular to a power electronic equipment control method and system adapted to new energy grid connection. Background Art

[0002] The connection of new energy to the grid has put forward many requirements for the control of power electronic equipment, requiring power electronic equipment to have stability, efficiency, reliability and flexibility. Specifically, the connection of new energy to the grid will affect the stability of the power grid, so power electronic equipment needs to have strong stable control capabilities, fast response, high-precision control and strong anti-interference capabilities; since the connection of new energy to the grid requires long-term and high-efficiency operation, power electronic equipment must have high reliability, requiring power electronic equipment to use high-quality materials and components, and strict quality control and testing; due to the diversity and complexity of the new energy grid-connected system, power electronic equipment needs to have flexible control strategies and adaptability to cope with different operating environments and conditions, requiring power electronic equipment to be able to achieve intelligent, modular and customizable design; an important purpose of the connection of new energy to the grid is to improve energy efficiency, so power electronic equipment needs to have efficient control capabilities, requiring power electronic equipment to use advanced power electronic technology and control algorithms to achieve high-efficiency and low-energy operation.

[0003] Existing power electronic equipment is not adaptable enough to the grid connection of new energy sources, resulting in excessive voltage and current fluctuations during faults. The power electronic equipment initiates protection strategies, causing minor faults to permanently lock out or trigger chain reactions, resulting in power flow transfer, etc., which in turn causes power outages and affects the stable operation of power electronic equipment. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a power electronic equipment control method adapted to the grid connection of new energy sources, comprising:

[0005] Obtain the current and voltage values ​​of power electronic equipment connected to the new energy grid;

[0006] According to the current value and the position of the power electronic equipment in the power system, the fault judgment basis corresponding to the position is used to determine the fault input and output results of the power electronic equipment;

[0007] According to the fault state range where the fault input and exit result is located, set the integration stop state of the power electronic equipment;

[0008] According to the location and fault input and output results, the maximum limiting current of the power electronic equipment during fault ride-through is set;

[0009] When the voltage value exceeds the preset voltage range, the voltage value is limited in combination with the positive and negative sequence voltage command values ​​to achieve fault ride-through control of the power electronic equipment.

[0010] Preferably, according to the current value and the position of the power electronic equipment in the power system, a fault judgment basis corresponding to the position is used to determine the fault input and output result of the power electronic equipment, including:

[0011] When power electronics are installed at the sending end of the power system,

[0012] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the judgment basis of the sending-end fault, the fault input and output result of the power electronic equipment is determined to be a sending-end fault;

[0013] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the judgment basis for the sending-end fault exit, the fault input exit result of the power electronic equipment is determined to be the sending-end fault exit;

[0014] When power electronics are installed at the receiving end of the power system,

[0015] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the receiving-end fault judgment basis, the fault input and output result of the power electronic equipment is determined to be a receiving-end fault;

[0016] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the receiving-end fault exit judgment basis, the fault input exit result of the power electronic equipment is determined to be the receiving-end fault exit.

[0017] Preferably, the sending end fault judgment basis includes a first calculation formula and a second calculation formula;

[0018] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the judgment basis of the sending-end fault, then the fault input and output result of the power electronic equipment is determined to be a sending-end fault, including:

[0019] When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the first calculation formula, it is determined that the fault input and output result of the power electronic equipment is a primary fault at the sending end;

[0020] When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the second calculation formula, it is determined that the fault input and output result of the power electronic equipment is a secondary fault at the sending end;

[0021] The first calculation formula is as follows:

[0022]

[0023] The second calculation formula is as follows:

[0024]

[0025] Wherein, T is the joint judgment time; Es is the current value.

[0026] Preferably, the sending end fault exit judgment basis includes the third calculation formula and the fourth calculation formula;

[0027] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault duration exit range in the judgment basis for the sending-end fault exit, the fault input exit result of the power electronic equipment is determined to be the sending-end fault exit, including:

[0028] When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the third calculation formula, the fault input exit result of the power electronic equipment is determined to be a sending-end primary fault exit;

[0029] When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the fourth calculation formula, it is determined that the fault input exit result of the power electronic equipment is a sending-end secondary fault exit;

[0030] The third calculation formula is as follows:

[0031]

[0032] The fourth calculation formula is as follows:

[0033]

[0034] Wherein, T is the joint judgment time; Es is the current value.

[0035] Preferably, the receiving end fault judgment basis is the fifth calculation formula, and the receiving end fault exit judgment basis is the sixth calculation formula;

[0036] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the fault judgment basis of the receiving end, the fault input and output result of the power electronic equipment is determined to be a receiving end fault, including:

[0037] When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the fifth calculation formula, the fault input and output result of the power electronic equipment is determined to be a receiving-end fault;

[0038] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the receiving-end fault exit judgment basis, the fault input exit result of the power electronic equipment is determined to be the receiving-end fault exit, including:

[0039] When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the sixth calculation formula, the fault input exit result of the power electronic equipment is determined to be the receiving end fault exit;

[0040] Among them, the fifth calculation formula is as follows:

[0041]

[0042] The sixth calculation formula is as follows:

[0043]

[0044] Wherein, T is the joint judgment time; Es is the current value.

[0045] Preferably, the integration stop state of the power electronic equipment is set according to the fault state range in which the fault input exit result is located, including:

[0046] When the fault state range of the fault input and exit result includes a sending-end primary fault, a sending-end secondary fault or a receiving-end fault, the integration stop state of the power electronic equipment is set to start integration stop;

[0047] When the fault input exit result is within the fault state range including the sending end primary fault exit, the sending end secondary fault exit or the receiving end fault exit, the integral stop state of the power electronic equipment is set to start integral stop exit.

[0048] Preferably, according to the location and the fault input / output result, the maximum limiting current setting for the power electronic equipment during fault ride-through includes:

[0049] When the fault input / output result of the power electronic equipment is a primary fault at the sending end, the maximum limiting current of the power electronic equipment during fault ride-through is set to the first maximum limiting current at the sending end;

[0050] When the fault input / output result of the power electronic equipment is a secondary fault at the sending end, the maximum limiting current of the power electronic equipment during fault ride-through is set to the second maximum limiting current at the sending end; wherein the first maximum limiting current at the sending end is greater than the second maximum limiting current at the sending end;

[0051] When the fault input / output result of the power electronic equipment is a receiving-end fault, the maximum limiting current of the power electronic equipment during fault ride-through is set to the maximum limiting current of the receiving-end.

[0052] Preferably, the voltage value is limited in combination with the positive and negative sequence voltage command values, including:

[0053] Determine the voltage command value of the power electronic equipment according to the positive and negative sequence combined voltage command value of the power electronic equipment;

[0054] The maximum limiting voltage of the power electronic equipment is determined based on the voltage command value and the maximum voltage limit.

[0055] Preferably, the power electronic equipment adopts a dual closed-loop structure, and the dual closed-loop control includes an outer loop control and an inner loop control, and the outer loop control is an outer loop network type control or an outer loop network type control;

[0056] Among them, the outer loop grid-forming control adopts the voltage frequency VF control strategy, the outer loop grid-following control adopts the active and reactive power PQ control strategy; the inner loop control adopts the constant current control strategy.

[0057] Preferably, after determining the fault input / output result of the power electronic equipment, the method further comprises:

[0058] When the power electronic equipment adopts the outer loop grid type control, the negative sequence current limit is set for the power electronic equipment, and the negative sequence current limit of the power electronic equipment is set within the preset current threshold range.

[0059] Based on the same inventive concept, the present invention also provides a power electronic equipment control system adapted to the grid connection of new energy sources, comprising:

[0060] A data acquisition module is used to obtain the current and voltage values ​​of power electronic equipment connected to the new energy grid;

[0061] A fault input / output judgment module is used to determine the fault input / output result of the power electronic equipment according to the current value and the position of the power electronic equipment in the power system and the fault judgment basis corresponding to the position;

[0062] An integration stop state determination module is used to set the integration stop state of the power electronic equipment according to the fault state range where the fault input and output result is located;

[0063] The maximum limiting current determination module is used to set the maximum limiting current of the power electronic equipment during fault ride-through according to the location and fault input / output results;

[0064] The voltage limiting module is used to limit the voltage value when the voltage value exceeds the preset voltage range in combination with the positive and negative sequence voltage command values, so as to realize fault ride-through control of the power electronic equipment.

[0065] Preferably, the fault input / exit judgment module includes: a sending-end fault input / exit judgment submodule and a receiving-end fault input / exit judgment submodule;

[0066] The sending end fault input and output judgment submodule includes:

[0067] A sending-end fault judgment unit is used to determine that the fault input / output result of the power electronic equipment is a sending-end fault when the power electronic equipment is at the sending-end position of the power system, if the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the sending-end fault judgment basis;

[0068] A sending-end fault exit judgment unit is used to determine that the fault input exit result of the power electronic equipment is a sending-end fault exit if the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the sending-end fault exit judgment basis when the power electronic equipment is at the sending-end position of the power system;

[0069] The receiving end fault input and output judgment submodule includes:

[0070] A receiving-end fault judgment unit is used to determine that the fault input / output result of the power electronic equipment is a receiving-end fault when the power electronic equipment is at the receiving-end position of the power system, if the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the receiving-end fault judgment basis;

[0071] The receiving-end fault exit judgment unit is used to determine that the fault input exit result of the power electronic equipment is a receiving-end fault exit when the power electronic equipment is at the receiving-end position of the power system and if the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the receiving-end fault exit judgment basis.

[0072] Preferably, the sending end fault judgment basis includes a first calculation formula and a second calculation formula;

[0073] The sending end fault judgment unit includes:

[0074] The sending-end primary fault judgment subunit is specifically used to determine that the fault input and output result of the power electronic equipment is a sending-end primary fault when the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the first calculation formula;

[0075] The sending-end secondary fault judgment subunit is specifically used to determine that the fault input and output result of the power electronic equipment is a sending-end secondary fault when the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the second calculation formula;

[0076] The first calculation formula is as follows:

[0077]

[0078] The second calculation formula is as follows:

[0079]

[0080] Wherein, T is the joint judgment time; Es is the current value.

[0081] Preferably, the sending end fault exit judgment basis includes the third calculation formula and the fourth calculation formula;

[0082] The sending end fault exit judgment unit includes:

[0083] The sending-end primary fault exit judgment subunit is specifically used to determine that the fault input exit result of the power electronic equipment is a sending-end primary fault exit when the current value and the joint judgment time length of the power electronic equipment meet the fault current exit range and the fault time length exit range in the third calculation formula;

[0084] The sending-end secondary fault exit judgment subunit is specifically used to determine that the fault input exit result of the power electronic equipment is a sending-end secondary fault exit when the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the fourth calculation formula;

[0085] The third calculation formula is as follows:

[0086]

[0087] The fourth calculation formula is as follows:

[0088]

[0089] Wherein, T is the joint judgment time; Es is the current value.

[0090] Preferably, the receiving end fault judgment basis is the fifth calculation formula, and the receiving end fault exit judgment basis is the sixth calculation formula;

[0091] The receiving-end fault judgment unit is specifically used to: when the current value and the joint judgment time of the power electronic equipment meet the fault current range and the fault time range in the fifth calculation formula, determine that the fault input and output result of the power electronic equipment is a receiving-end fault;

[0092] The receiving-end fault exit judgment unit is specifically used to: when the current value and the joint judgment time length of the power electronic equipment meet the fault current exit range and the fault time length exit range in the sixth calculation formula, determine that the fault input exit result of the power electronic equipment is the receiving-end fault exit;

[0093] Among them, the fifth calculation formula is as follows:

[0094]

[0095] The sixth calculation formula is as follows:

[0096]

[0097] Wherein, T is the joint judgment time; Es is the current value.

[0098] Preferably, the integration stop state determination module includes:

[0099] The start integration stop submodule is used to set the integration stop state of the power electronic equipment to start integration stop when the fault input exit result is in the fault state range including the sending end primary fault, the sending end secondary fault or the receiving end fault;

[0100] The start integral stop exit submodule is used to set the integral stop state of the power electronic equipment to start integral stop exit when the fault input exit result is in the fault state range including the sending end first-level fault exit, the sending end second-level fault exit or the receiving end fault exit.

[0101] Preferably, the maximum limiting current determination module includes:

[0102] The sending-end first maximum limiting current determination submodule is used to set the maximum limiting current of the power electronic equipment when performing fault ride-through to the sending-end first maximum limiting current when the fault input and exit result of the power electronic equipment is a sending-end primary fault;

[0103] The sending-end second maximum limiting current determination submodule is used to set the maximum limiting current of the power electronic equipment during fault ride-through to the sending-end second maximum limiting current when the fault input and exit result of the power electronic equipment is a sending-end secondary fault; wherein the sending-end first maximum limiting current is greater than the sending-end second maximum limiting current;

[0104] The receiving-end maximum limiting current determination submodule is used to set the maximum limiting current of the power electronic equipment during fault ride-through to the receiving-end maximum limiting current when the fault input and output result of the power electronic equipment is a receiving-end fault.

[0105] Preferably, the voltage limiting module is used for:

[0106] Determine the voltage command value of the power electronic equipment according to the positive and negative sequence combined voltage command value of the power electronic equipment;

[0107] The maximum limiting voltage of the power electronic equipment is determined based on the voltage command value and the maximum voltage limit.

[0108] Preferably, the power electronic equipment adopts a dual closed-loop structure, and the dual closed-loop control includes an outer loop control and an inner loop control, and the outer loop control is an outer loop network type control or an outer loop network type control;

[0109] Among them, the outer loop grid-forming control adopts the voltage frequency VF control strategy, the outer loop grid-following control adopts the active and reactive power PQ control strategy; the inner loop control adopts the constant current control strategy.

[0110] Preferably, the system further comprises:

[0111] The negative sequence current limiting module is used to set the negative sequence current limit for the power electronic equipment when the power electronic equipment adopts the outer loop grid type control. The negative sequence current limit of the power electronic equipment is set within the preset current threshold range.

[0112] Based on the same inventive concept, the present invention also provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0113] The memory is used to store one or more programs;

[0114] When the one or more programs are executed by the at least one processor, a power electronic equipment control method adapted to new energy grid connection as described above is implemented.

[0115] Based on the same inventive concept, the present invention also provides a readable storage medium on which an execution program is stored. When the execution program is executed, a power electronic equipment control method adapted to the grid connection of new energy as described above is implemented.

[0116] Compared with the closest prior art, the present invention has the following beneficial effects:

[0117] The present invention provides a control method for power electronic equipment adapted to the connection of new energy to the grid, comprising: obtaining the current value and voltage value of the power electronic equipment connected to the grid for new energy; according to the current value and the position of the power electronic equipment in the power system, using the fault judgment basis corresponding to the position to determine the fault input and exit result of the power electronic equipment; according to the fault state range where the fault input and exit result is located, setting the integral stop state of the power electronic equipment; according to the position and the fault input and exit result, setting the maximum limiting current when the power electronic equipment is fault-traveled; when the voltage value exceeds the preset voltage range, combining the positive and negative sequence voltage command values ​​to limit the voltage value, and realizing the fault-travel control of the power electronic equipment. The present invention combines the fault judgment basis of the power electronic equipment when the new energy is connected to the grid, sets the integral stop state, the maximum limiting current and the voltage limit of the power electronic equipment, controls the voltage and current amplitude when the new energy is connected to the grid, and realizes efficient and reliable new energy grid connection through the high efficiency, stability, reliability and flexibility of the power electronic equipment, and finally obtains the stable operation of the power electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0118] Figure 1A flow chart of a method for controlling power electronic equipment adapted to the grid connection of new energy is provided for the present invention;

[0119] Figure 2 A structural diagram of a power electronic equipment control system adapted to new energy grid connection provided by the present invention;

[0120] Figure 3 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0121] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0122] Embodiment 1:

[0123] The present invention provides a control method for power electronic equipment adapted to new energy grid connection, specifically, Figure 1 A flow chart of a power electronic equipment control method adapted to new energy grid connection provided by an embodiment of the present invention includes the following steps as shown in the figure:

[0124] S1: Obtain the current value and voltage value of the power electronic equipment connected to the new energy grid;

[0125] S2: According to the current value and the position of the power electronic equipment in the power system, the fault judgment basis corresponding to the position is used to determine the fault input and output result of the power electronic equipment;

[0126] S3: setting the integration stop state of the power electronic equipment according to the fault state range where the fault input and output result is located;

[0127] S4: Set the maximum limiting current of the power electronic equipment during fault ride-through according to the location and fault input / output results;

[0128] S5: When the voltage value exceeds the preset voltage range, the voltage value is limited in combination with the positive and negative sequence voltage command values ​​to achieve fault ride-through control of the power electronic equipment.

[0129] The present invention combines the fault judgment basis of power electronic equipment when new energy is connected to the grid, sets the integration stop state, maximum current limit and voltage limit of the power electronic equipment, controls the voltage and current amplitude when new energy is connected to the grid, and realizes efficient and reliable new energy grid connection.

[0130] In the present invention, the control mode of the power electronic equipment is dual closed-loop control, wherein the dual closed-loop control specifically includes outer loop control and inner loop control; the outer loop control adopts one of an outer loop networking control strategy or an outer loop following network control strategy.

[0131] In an optional implementation, the outer loop network control strategy adopts voltage frequency VF (Volt-Frequency) control, and the outer loop network control strategy adopts active and reactive power PQ (Power-Quality) control strategy;

[0132] The inner loop control adopts the current control strategy, that is, the constant current control strategy.

[0133] It should be noted that the voltage frequency VF control given value is voltage and frequency, that is, the output voltage amplitude and frequency are controlled to be synchronized with the output voltage; the active and reactive power PQ control given value is active power and reactive power, that is, the active power and reactive power of the output voltage are controlled to meet the load requirements; the inner loop control given value is the current value, that is, the inner loop control is achieved by controlling the current value.

[0134] In an embodiment of the present invention, the above-mentioned control mode setting can adapt to the control of different types of power electronic devices, including but not limited to VSC converters (Voltage Source Converter), energy storage, reactive power compensation devices, doubly-fed wind turbines, etc.

[0135] During the execution of the control method, the current value at each moment is paid attention to in real time. When the current value instruction rises rapidly, the power electronic equipment control method adapted to the new energy grid connection is started.

[0136] Specifically, the current value of the power electronic equipment connected to the new energy grid can be collected by a sensor, and the control method of the power electronic equipment connected to the new energy grid can be determined according to the change of the current value.

[0137] After starting the power electronic equipment control method for renewable energy grid connection, the fault input and output results of the power electronic equipment are determined according to the current value and the position of the power electronic equipment in the power system and the fault judgment basis corresponding to the position.

[0138] That is, it is determined whether the current power electronic equipment is a sending end or a receiving end, and further, based on the fault judgment basis corresponding to the sending end or the receiving end, the input and output results of the power electronic equipment are determined.

[0139] Specifically, when power electronics are installed at the sending end of the power system,

[0140] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the judgment basis of the sending-end fault, the fault input and output result of the power electronic equipment is determined to be a sending-end fault;

[0141] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the judgment basis for the sending-end fault exit, the fault input exit result of the power electronic equipment is determined to be the sending-end fault exit;

[0142] When power electronics are installed at the receiving end of the power system,

[0143] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the receiving-end fault judgment basis, the fault input and output result of the power electronic equipment is determined to be a receiving-end fault;

[0144] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the receiving-end fault exit judgment basis, the fault input exit result of the power electronic equipment is determined to be the receiving-end fault exit.

[0145] Wherein, the sending end fault judgment basis includes a first calculation formula and a second calculation formula;

[0146] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the judgment basis of the sending-end fault, the fault input and output result of the power electronic equipment is determined to be a sending-end fault, including:

[0147] When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the first calculation formula, it is determined that the fault input and output result of the power electronic equipment is a primary fault at the sending end;

[0148] When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the second calculation formula, it is determined that the fault input and output result of the power electronic equipment is a secondary fault at the sending end;

[0149] The first calculation formula is as follows:

[0150]

[0151] The second calculation formula is as follows:

[0152]

[0153] Wherein, T is the joint judgment time; Es is the current value.

[0154] The judgment basis for the failure exit at the sending end includes the third calculation formula and the fourth calculation formula;

[0155] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault duration exit range in the judgment basis for the sending-end fault exit, the fault input exit result of the power electronic equipment is determined to be the sending-end fault exit, including:

[0156] When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the third calculation formula, the fault input exit result of the power electronic equipment is determined to be a sending-end primary fault exit;

[0157] When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the fourth calculation formula, it is determined that the fault input exit result of the power electronic equipment is a sending-end secondary fault exit;

[0158] The third calculation formula is as follows:

[0159]

[0160] The fourth calculation formula is as follows:

[0161]

[0162] Wherein, T is the joint judgment time; Es is the current value.

[0163] The fifth calculation formula is used to determine the receiving end failure, and the sixth calculation formula is used to determine the receiving end failure exit.

[0164] If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the fault judgment basis of the receiving end, the fault input and output result of the power electronic equipment is determined to be a receiving end fault, including:

[0165] When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the fifth calculation formula, the fault input and output result of the power electronic equipment is determined to be a receiving-end fault;

[0166] If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the receiving-end fault exit judgment basis, the fault input exit result of the power electronic equipment is determined to be the receiving-end fault exit, including:

[0167] When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the sixth calculation formula, the fault input exit result of the power electronic equipment is determined to be the receiving end fault exit;

[0168] Among them, the fifth calculation formula is as follows:

[0169]

[0170] The sixth calculation formula is as follows:

[0171]

[0172] Wherein, T is the joint judgment time; Es is the current value.

[0173] Es is the current per unit value, which is the relative current value and can also be called the AC voltage vector amplitude.

[0174] In this embodiment, different fault judgment bases are set according to the position or role (sending end or receiving end) of the power electronic equipment, including the occurrence and exit judgment logic of each level of fault. When the power electronic equipment is the sending end, two sets of calculation formulas are disclosed to judge the occurrence and exit of the sending end fault; when the power electronic equipment is the receiving end, two sets of calculation formulas are also disclosed to judge the occurrence and exit of the receiving end fault.

[0175] Specifically, when the power electronic equipment is at the sending end, there is a first calculation formula, which is considered to be a primary fault at the sending end when satisfied; there is a second calculation formula. When satisfied, it is considered to be a primary fault exit at the sending end; there is a third calculation formula, which is considered to be a primary fault exit at the sending end when satisfied; there is a fourth calculation formula, which is considered to be a secondary fault exit at the sending end when satisfied.

[0176] When the power electronic equipment is the receiving end, there is a fifth calculation formula, which is considered to be a receiving end fault when it is satisfied; there is a sixth calculation formula, which is considered to be a receiving end fault exit when it is satisfied.

[0177] In this embodiment, after determining the fault exit result of the power electronic equipment, if the power electronic equipment adopts outer loop grid control, a negative sequence current limit is set for the power electronic equipment, and the negative sequence current limit of the power electronic equipment is within a preset current threshold range.

[0178] The range of the negative sequence current limiting is preset, and the function of the negative sequence current limiting is to limit the negative sequence current to become smaller during a fault, so that the negative sequence component is limited during the fault.

[0179] When using outer loop grid control, the setting of negative sequence limit is a key link. Grid control is usually used for power electronic equipment such as inverters or converters in microgrids or distributed generation systems to maintain the voltage and frequency stability of the system. The negative sequence limit is a threshold value pre-set in this control strategy to limit the magnitude of negative sequence current. Negative sequence current is caused by system faults or asymmetric loads, which will cause system voltage distortion and additional power loss.

[0180] The main function of negative sequence limiting is to reduce the negative impact on the system by limiting the magnitude of negative sequence current during a fault. By setting the negative sequence limiting value, the magnitude of the negative sequence current can be controlled so that it does not exceed the preset threshold, thereby ensuring the stable operation of the system during the fault. The range of negative sequence limiting values ​​is usually pre-set and determined according to the specific needs and operating conditions of the system. The setting of this range needs to take into account the system's rated voltage, current, frequency and other parameters, as well as the degree of impact of the allowable negative sequence current on the system. The setting of the limiting value requires a balance between the stability of the system and the performance during the fault.

[0181] In some specific implementations, the negative sequence limiting can be limited to perform an additional second conditional limiting during a fault period on the basis of the negative sequence limiting, so as to accelerate the stable recovery of the power system by limiting the magnitude of the negative sequence current.

[0182] It is understandable that in the outer loop network control, a reasonable setting of the negative sequence limit value can improve the reliability and performance of the system. The specific limit value setting needs to be determined according to the actual situation and requirements of the system, and appropriate adjustments and optimizations should be made. The specific limit value setting is not limited here.

[0183] After determining the input fault exit result of the power electronic equipment, the integration stop state of the power electronic equipment is set according to the fault state range where the fault input exit result is located, including:

[0184] When the fault state range of the fault input and exit result includes a sending-end primary fault, a sending-end secondary fault or a receiving-end fault, the integration stop state of the power electronic equipment is set to start integration stop;

[0185] When the fault input exit result is within the fault state range including the sending end primary fault exit, the sending end secondary fault exit or the receiving end fault exit, the integral stop state of the power electronic equipment is set to start integral stop exit.

[0186] Specifically, it is determined whether the current power electronic equipment is in a sending end or a receiving end state, and according to its state, a corresponding fault judgment basis is applied to set the integration stop state of the power electronic equipment.

[0187] If the power electronic equipment is at the sending end, if any level of sending end fault is met, it is deemed that the corresponding level of sending end fault exists; if any level of sending end fault exit is met, it is deemed that the corresponding level of sending end fault exit exists.

[0188] If the power electronic equipment is at the receiving end, if the receiving end fault is met, it is deemed that the corresponding level of receiving end fault exists; if any level of receiving end fault exit is met, it is deemed that the corresponding level of receiving end fault exit exists.

[0189] If it is determined that any of the first-level fault, second-level fault or receiving-end fault states currently exist, the integration stop is initiated; if it is determined that any of the first-level fault exit, second-level fault exit or receiving-end fault exit states currently exist, the integration stop exit is initiated.

[0190] In practical applications, this kind of logic judgment is usually embedded in the control system of power electronic equipment, and determines whether to trigger the corresponding fault handling mechanism by monitoring the operating status and parameters of the system in real time. Once a fault or fault exit is detected, the control system will start or stop the integration stop accordingly to ensure that the power electronic equipment can maintain high reliability operation during the fault period and resume normal working state after the fault is restored.

[0191] The specific control method requires further technical details and parameter settings to ensure effectiveness and reliability in practical applications, which are not limited here.

[0192] Furthermore, according to the location and the fault input / output result, the maximum limiting current of the power electronic equipment during fault ride-through is set, including:

[0193] When the fault input / output result of the power electronic equipment is a primary fault at the sending end, the maximum limiting current of the power electronic equipment during fault ride-through is set to the first maximum limiting current at the sending end;

[0194] When the fault input / output result of the power electronic equipment is a secondary fault at the sending end, the maximum limiting current of the power electronic equipment during fault ride-through is set to the second maximum limiting current at the sending end; wherein the first maximum limiting current at the sending end is greater than the second maximum limiting current at the sending end;

[0195] When the fault input / output result of the power electronic equipment is a receiving-end fault, the maximum limiting current of the power electronic equipment during fault ride-through is set to the maximum limiting current of the receiving-end.

[0196] In a specific implementation, when the fault input / output result of the power electronic equipment is a primary fault at the sending end, the first maximum limiting current IMAX at the sending end may be set to 0.8PU;

[0197] When the fault input and output result of the power electronic equipment is a secondary fault at the sending end, the second maximum limiting current IMAX at the sending end can be set to 0.6PU;

[0198] When the fault input and output result of the power electronic equipment is a receiving-end fault, the maximum limiting current IMAX of the receiving end can be set to 0.8PU, where PU is the current per unit value, that is, the current relative value.

[0199] When power electronic equipment is in different working states and fault levels, the maximum current value IMAX needs to be set differently to ensure the safe operation of the equipment under fault conditions.

[0200] Specifically, the process of setting the IMAX logic for comprehensive limiting according to different states and fault levels is as follows:

[0201] First, determine the state of the power electronic equipment. If it is in the sending end position, enter the sending end state processing logic; if it is in the dead receiving end position, enter the receiving end state processing logic.

[0202] Then, IMAX is set according to the fault level. If it is at the sending end and there is a first-level fault at the sending end, IMAX is set to 0.8PU; if it is at the sending end and there is a second-level fault at the sending end, IMAX is set to 0.6PU;

[0203] If it is at the receiving end position and in the receiving end fault state, set IMAX to 0.8PU.

[0204] After setting IMAX, the set IMAX value will be used to perform comprehensive current limiting. Comprehensive limiting means limiting the current to ensure that the current does not exceed the set IMAX value.

[0205] Specific comprehensive limiting methods include adjusting the output power of power electronic equipment, changing the reference voltage or current in the control strategy, or limiting the current through other technical means. The purpose of comprehensive limiting is to protect power electronic equipment under fault or abnormal conditions, prevent it from being subjected to excessive current shock, and thus avoid damage to power electronic equipment or system collapse.

[0206] It is understandable that the comprehensive limiting strategy may vary due to different types of power electronic equipment and system designs, and is not limited here.

[0207] The setting value of IMAX needs to be determined based on the rated voltage and current of the system. In practical applications, it can be appropriately adjusted and optimized according to the actual operating conditions and requirements of the system.

[0208] In an optional implementation, the voltage value of the power electronic equipment connected to the new energy grid may also be obtained. When the voltage value exceeds a preset voltage range, the voltage value is limited by combining the positive and negative sequence voltage command values, including:

[0209] Determine the voltage command value of the power electronic equipment according to the positive and negative sequence combined voltage command value of the power electronic equipment;

[0210] The maximum limiting voltage of the power electronic equipment is determined based on the voltage command value and the maximum voltage limit.

[0211] The voltage command value output by the inner loop is limited by the positive-sequence and negative-sequence command values ​​of the combined voltage. Specifically, the voltage limit value is determined in real time. When the voltage amplitude exceeds a preset range, the positive-sequence and negative-sequence command values ​​of the combined voltage start the voltage limit.

[0212] In a specific implementation, the voltage limit may be set between 1PU and 1.7PU.

[0213] The power electronic equipment control method adapted to the grid connection of new energy provided by the present invention is a grid connection control strategy adapted to the low voltage ride-through period under the condition of new energy access, which solves the problem of how to coordinate the low voltage ride-through limit and combines the integration during the fault period.

[0214] In the present invention, the fault judgment basis corresponding to the position is used to set the basis for segmented limiting, and then the integration stop state of the power electronic equipment is set through the determined input and output results of the power electronic equipment, and the maximum limiting current and voltage limit during fault crossing are set. In addition, when the power electronic equipment adopts the outer loop grid control, the negative sequence current limit is also set. The transient process is stably controlled by current and voltage limits, and a new control strategy for new energy grid connection is provided through the set fault judgment basis and integration stop state, and through the efficient, stable, reliable and flexible characteristics of the power electronic equipment, to achieve rapid recovery from faults, and finally comprehensively realize the fault crossing control of the power electronic equipment.

[0215] Embodiment 2:

[0216] Based on the same inventive concept, the present invention also provides a power electronic equipment control system 200 adapted to the grid connection of new energy sources. The system structure is as follows: Figure 2 As shown, including:

[0217] The data acquisition module 201 is used to acquire the current value and voltage value of the power electronic equipment connected to the new energy grid;

[0218] A fault input / output judgment module 202 is used to determine the fault input / output result of the power electronic equipment according to the current value and the position of the power electronic equipment in the power system and the fault judgment basis corresponding to the position;

[0219] An integration stop state determination module 203 is used to set the integration stop state of the power electronic equipment according to the fault state range where the fault input and output result is located;

[0220] The maximum limiting current determination module 204 is used to set the maximum limiting current of the power electronic equipment when performing fault ride-through according to the position and the fault input / output result;

[0221] The voltage limiting module 205 is used to limit the voltage value when the voltage value exceeds the preset voltage range in combination with the positive and negative sequence voltage command values, so as to realize fault ride-through control of the power electronic equipment.

[0222] Preferably, the fault input / exit judgment module 202 includes: a sending-end fault input / exit judgment submodule and a receiving-end fault input / exit judgment submodule;

[0223] The sending end fault input and output judgment submodule includes:

[0224] A sending-end fault judgment unit is used to determine that the fault input / output result of the power electronic equipment is a sending-end fault when the power electronic equipment is at the sending-end position of the power system, if the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the sending-end fault judgment basis;

[0225] A sending-end fault exit judgment unit is used to determine that the fault input exit result of the power electronic equipment is a sending-end fault exit if the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the sending-end fault exit judgment basis when the power electronic equipment is at the sending-end position of the power system;

[0226] The receiving end fault input and output judgment submodule includes:

[0227] A receiving-end fault judgment unit is used to determine that the fault input / output result of the power electronic equipment is a receiving-end fault when the power electronic equipment is at the receiving-end position of the power system, if the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the receiving-end fault judgment basis;

[0228] The receiving-end fault exit judgment unit is used to determine that the fault input exit result of the power electronic equipment is a receiving-end fault exit when the power electronic equipment is at the receiving-end position of the power system and if the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the receiving-end fault exit judgment basis.

[0229] Preferably, the sending end fault judgment basis includes a first calculation formula and a second calculation formula;

[0230] The sending end fault judgment unit includes:

[0231] The sending-end primary fault judgment subunit is specifically used to determine that the fault input and output result of the power electronic equipment is a sending-end primary fault when the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the first calculation formula;

[0232] The sending-end secondary fault judgment subunit is specifically used to determine that the fault input and output result of the power electronic equipment is a sending-end secondary fault when the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the second calculation formula;

[0233] The first calculation formula is as follows:

[0234]

[0235] The second calculation formula is as follows:

[0236]

[0237] Wherein, T is the joint judgment time; Es is the current value.

[0238] Preferably, the sending end fault exit judgment basis includes the third calculation formula and the fourth calculation formula;

[0239] The sending end fault exit judgment unit includes:

[0240] The sending-end primary fault exit judgment subunit is specifically used to determine that the fault input exit result of the power electronic equipment is a sending-end primary fault exit when the current value and the joint judgment time length of the power electronic equipment meet the fault current exit range and the fault time length exit range in the third calculation formula;

[0241] The sending-end secondary fault exit judgment subunit is specifically used to determine that the fault input exit result of the power electronic equipment is a sending-end secondary fault exit when the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the fourth calculation formula;

[0242] The third calculation formula is as follows:

[0243]

[0244] The fourth calculation formula is as follows:

[0245]

[0246] Wherein, T is the joint judgment time; Es is the current value.

[0247] Preferably, the receiving end fault judgment basis is the fifth calculation formula, and the receiving end fault exit judgment basis is the sixth calculation formula;

[0248] The receiving-end fault judgment unit is specifically used to: when the current value and the joint judgment time of the power electronic equipment meet the fault current range and the fault time range in the fifth calculation formula, determine that the fault input and output result of the power electronic equipment is a receiving-end fault;

[0249] The receiving-end fault exit judgment unit is specifically used to: when the current value and the joint judgment time length of the power electronic equipment meet the fault current exit range and the fault time length exit range in the sixth calculation formula, determine that the fault input exit result of the power electronic equipment is the receiving-end fault exit;

[0250] Among them, the fifth calculation formula is as follows:

[0251]

[0252] The sixth calculation formula is as follows:

[0253]

[0254] Wherein, T is the joint judgment time; Es is the current value.

[0255] Preferably, the integration stop state determination module 203 includes:

[0256] The start integration stop submodule is used to set the integration stop state of the power electronic equipment to start integration stop when the fault input exit result is in the fault state range including the sending end primary fault, the sending end secondary fault or the receiving end fault;

[0257] The start integral stop exit submodule is used to set the integral stop state of the power electronic equipment to start integral stop exit when the fault input exit result is in the fault state range including the sending end first-level fault exit, the sending end second-level fault exit or the receiving end fault exit.

[0258] Preferably, the maximum limiting current determination module 204 includes:

[0259] The sending-end first maximum limiting current determination submodule is used to set the maximum limiting current of the power electronic equipment when performing fault ride-through to the sending-end first maximum limiting current when the fault input and exit result of the power electronic equipment is a sending-end primary fault;

[0260] The sending-end second maximum limiting current determination submodule is used to set the maximum limiting current of the power electronic equipment during fault ride-through to the sending-end second maximum limiting current when the fault input and exit result of the power electronic equipment is a sending-end secondary fault; wherein the sending-end first maximum limiting current is greater than the sending-end second maximum limiting current;

[0261] The receiving-end maximum limiting current determination submodule is used to set the maximum limiting current of the power electronic equipment during fault ride-through to the receiving-end maximum limiting current when the fault input and output result of the power electronic equipment is a receiving-end fault.

[0262] Preferably, the voltage limiting module 205 is used for:

[0263] Determine the voltage command value of the power electronic equipment according to the positive and negative sequence combined voltage command value of the power electronic equipment;

[0264] The maximum limiting voltage of the power electronic equipment is determined based on the voltage command value and the maximum voltage limit.

[0265] Preferably, the power electronic equipment adopts a dual closed-loop structure, and the dual closed-loop control includes an outer loop control and an inner loop control, and the outer loop control is an outer loop network type control or an outer loop network type control;

[0266] Among them, the outer loop grid-forming control adopts the voltage frequency VF control strategy, the outer loop grid-following control adopts the active and reactive power PQ control strategy; the inner loop control adopts the constant current control strategy.

[0267] Preferably, the system further comprises:

[0268] The negative sequence current limiting module is used to set the negative sequence current limit for the power electronic equipment when the power electronic equipment adopts the outer loop grid type control. The negative sequence current limit of the power electronic equipment is set within the preset current threshold range.

[0269] In the embodiment of the present invention, a system suitable for different structures is realized through a series of modular designs. The system can achieve closed-loop, reliable and efficient execution through collection, analysis and control.

[0270] Embodiment 3:

[0271] Based on the same inventive concept, Figure 3 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0272] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a readable storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of a power electronic equipment control method adapted to the grid connection of new energy in the above-mentioned embodiment.

[0273] Embodiment 4:

[0274] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It can be understood that the readable storage medium here can include both built-in storage media in electronic devices and, of course, extended storage media supported by electronic devices. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk storage. The processor can load and execute one or more instructions stored in the storage medium to implement the steps of a power electronic equipment control method adapted to the grid connection of new energy in the above embodiment.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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 The steps for the functions specified in one or more boxes.

[0279] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A control method for power electronic equipment adapted to new energy grid connection, characterized in that: include: Obtain the current and voltage values ​​of power electronic equipment connected to the new energy grid; According to the current value and the position of the power electronic equipment in the power system, a fault judgment basis corresponding to the position is used to determine a fault input / output result of the power electronic equipment; According to the fault state range in which the fault input and output result is located, setting the integration stop state of the power electronic equipment; According to the position and the fault input / output result, a maximum limiting current of the power electronic equipment during fault ride-through is set; When the voltage value exceeds a preset voltage range, the voltage value is limited in combination with positive and negative sequence voltage command values ​​to achieve fault ride-through control of the power electronic equipment.

2. The method according to claim 1, characterized in that The determining of the fault input / output result of the power electronic equipment according to the current value and the position of the power electronic equipment in the power system and using the fault judgment basis corresponding to the position includes: When the power electronic equipment is at the sending end of the power system, If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the judgment basis of the sending-end fault, then the fault input and output result of the power electronic equipment is determined to be a sending-end fault; If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the judgment basis for the sending-end fault exit, then the fault input exit result of the power electronic equipment is determined to be the sending-end fault exit; When the power electronic equipment is at the receiving end of the power system, If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the receiving-end fault judgment basis, then determine that the fault input / output result of the power electronic equipment is a receiving-end fault; If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and fault time exit range in the receiving-end fault exit judgment basis, the fault input exit result of the power electronic equipment is determined to be the receiving-end fault exit.

3. The method according to claim 2, characterized in that The sending end fault judgment basis includes a first calculation formula and a second calculation formula; If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the judgment basis of the sending-end fault, determining that the fault input and output result of the power electronic equipment is a sending-end fault includes: When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the first calculation formula, it is determined that the fault input and output result of the power electronic equipment is a sending-end primary fault; When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the second calculation formula, it is determined that the fault input and output result of the power electronic equipment is a sending-end secondary fault; The first calculation formula is as follows: The second calculation formula is as follows: Wherein, T is the joint judgment time; Es is the current value.

4. The method according to claim 2, characterized in that: The sending end failure exit judgment basis includes a third calculation formula and a fourth calculation formula; If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the sending-end fault exit judgment basis, determining the fault input exit result of the power electronic equipment as a sending-end fault exit, comprises: When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the third calculation formula, it is determined that the fault input exit result of the power electronic equipment is a sending-end primary fault exit; When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the fourth calculation formula, it is determined that the fault input exit result of the power electronic equipment is a sending-end secondary fault exit; The third calculation formula is as follows: The fourth calculation formula is as follows: Wherein, T is the joint judgment time; Es is the current value.

5. The method according to claim 2, characterized in that: The receiving end fault judgment basis is the fifth calculation formula, and the receiving end fault exit judgment basis is the sixth calculation formula; If the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the receiving-end fault judgment basis, determining that the fault input / output result of the power electronic equipment is a receiving-end fault includes: When the current value and the joint judgment time of the power electronic equipment meet the fault current range and fault time range in the fifth calculation formula, it is determined that the fault input and output result of the power electronic equipment is a receiving end fault; If the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the receiving-end fault exit judgment basis, determining the fault input exit result of the power electronic equipment as the receiving-end fault exit, comprises: When the current value and the joint judgment time of the power electronic equipment meet the fault current exit range and the fault time exit range in the sixth calculation formula, it is determined that the fault input exit result of the power electronic equipment is a receiving-end fault exit; Wherein, the fifth calculation formula is as follows: The sixth calculation formula is as follows: Wherein, T is the joint judgment time; Es is the current value.

6. The method according to any one of claims 3 to 5, characterized in that: The step of setting the integration stop state of the power electronic equipment according to the fault state range in which the fault input / exit result is located comprises: When the fault state range of the fault input and exit result includes a sending-end primary fault, a sending-end secondary fault or a receiving-end fault, the integration stop state of the power electronic equipment is set to start integration stop; When the fault state range of the fault input exit result includes the sending end primary fault exit, the sending end secondary fault exit or the receiving end fault exit, the integration stop state of the power electronic equipment is set to start integration stop exit.

7. The method according to claim 6, characterized in that The setting of the maximum limiting current of the power electronic equipment when performing fault ride-through according to the position and the fault input / output result includes: When the fault input / output result of the power electronic equipment is a primary fault at the sending end, the maximum limiting current of the power electronic equipment during fault ride-through is set to the first maximum limiting current at the sending end; When the fault input / output result of the power electronic equipment is a secondary fault at the sending end, the maximum limiting current of the power electronic equipment during fault ride-through is set to the second maximum limiting current at the sending end; wherein the first maximum limiting current at the sending end is greater than the second maximum limiting current at the sending end; When the fault-on / off result of the power electronic equipment is a receiving-end fault, the maximum limiting current of the power electronic equipment during fault ride-through is set to the receiving-end maximum limiting current.

8. The method according to claim 1, characterized in that The voltage value is limited by combining the positive and negative sequence voltage command values, including: Determining a voltage command value of the power electronic equipment according to a positive-negative sequence combined voltage command value of the power electronic equipment; The maximum voltage limit of the power electronic equipment is determined according to the voltage command value and the maximum voltage limit.

9. The method according to claim 1, characterized in that: The power electronic equipment adopts a double closed-loop structure, the double closed-loop control includes an outer loop control and an inner loop control, the outer loop control is an outer loop network type control or an outer loop network type control; Among them, the outer loop grid-forming control adopts a voltage frequency VF control strategy, the outer loop grid-following control adopts an active and reactive power PQ control strategy; and the inner loop control adopts a constant current control strategy.

10. The method according to claim 9, characterized in that After determining the fault input / output result of the power electronic equipment, the method further includes: When the power electronic equipment adopts outer loop grid control, a negative sequence current limit is set for the power electronic equipment, and the negative sequence current limit of the power electronic equipment is set within a preset current threshold range.

11. A power electronic equipment control system adapted to the grid connection of new energy, characterized in that: include: A data acquisition module is used to obtain the current and voltage values ​​of power electronic equipment connected to the new energy grid; A fault input / output judgment module is used to determine the fault input / output result of the power electronic equipment according to the current value and the position of the power electronic equipment in the power system and the fault judgment basis corresponding to the position; An integration stop state determination module, used to set the integration stop state of the power electronic equipment according to the fault state range in which the fault input exit result is located; A maximum limiting current determination module, used to set a maximum limiting current for the power electronic equipment when performing fault ride-through according to the position and the fault input / output result; The voltage limiting module is used to limit the voltage value when the voltage value exceeds a preset voltage range in combination with positive and negative sequence voltage command values, so as to achieve fault ride-through control of the power electronic equipment.

12. An electronic device, characterized in that: include: at least one processor and memory; The memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the power electronic equipment control method adapted to new energy grid connection as claimed in any one of claims 1 to 10 is implemented.

13. A readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, the power electronic equipment control method adapted to new energy grid connection as described in any one of claims 1 to 10 is implemented.

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