Low voltage ride through control method and system for power electronic equipment with high response speed

Abstract

The invention provides a low-voltage ride-through control method and system for high-response-speed power electronic equipment, and the method comprises the steps: selecting an operation mode of an outer-ring controller according to an access object of the outer-ring controller of the power electronic equipment; when the operation mode of the outer loop controller adopts a network construction type control mode, a cross coupling decoupling control algorithm is adopted for an inner loop controller of the power electronic equipment, and a three-phase voltage instruction value of the power electronic equipment is obtained; when the operation mode of the outer loop controller adopts a network following type control mode, a feed-forward decoupling control algorithm is adopted for the inner loop controller, and a three-phase voltage instruction value of the power electronic equipment is obtained; performing low-voltage ride-through control on the power electronic equipment according to the three-phase voltage instruction value; during low voltage ride through control, different inner loop control algorithms are adopted according to the operation mode of the outer loop controller, the control response speed of power electronic equipment is improved, and rapid recovery of low voltage ride through is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic equipment, and in particular to a low voltage ride-through control method and system for power electronic equipment with high response speed. Background Art

[0002] At present, power electronic equipment plays an increasingly important role in modern power systems, and is widely used in distributed power generation, smart grids, energy conversion, etc. With the development of technology and the increase in demand, the demand for high-speed response of power electronic equipment is becoming increasingly prominent.

[0003] In power electronic equipment, fast control is the key to achieve efficient and stable operation. With the continuous development of power electronic technology, the control response speed of existing power electronic equipment is still slow because the d-axis and q-axis of the inner loop controller cannot be completely decoupled. Summary of the invention

[0004] In order to solve the problem of slow control response speed of existing power electronic equipment due to the inability to completely decouple the d-axis and q-axis of the inner loop controller, the present invention proposes a low voltage ride-through control method for power electronic equipment with high response speed, comprising:

[0005] Selecting an operation mode of the outer loop controller of the power electronic equipment according to an access object of the outer loop controller;

[0006] When the operation mode of the outer loop controller adopts the grid-type control mode, a cross-coupling decoupling control algorithm is adopted for the inner loop controller of the power electronic equipment to obtain a three-phase voltage command value of the power electronic equipment;

[0007] When the outer loop controller operates in a grid-following control mode, a feedforward decoupling control algorithm is used on the inner loop controller to obtain a three-phase voltage command value of the power electronic equipment;

[0008] According to the three-phase voltage command values, low voltage ride-through control is performed on the power electronic equipment.

[0009] Optionally, selecting the operation mode of the outer loop controller according to the access object of the outer loop controller of the power electronic equipment includes:

[0010] When the access object of the outer loop controller of the power electronic equipment is a new energy system or a passive system, the operation mode of the outer loop controller adopts a network-building control mode;

[0011] When the access object of the outer loop controller is an AC power grid, the operation mode of the outer loop controller adopts a grid-following control mode.

[0012] Optionally, the inner loop controller of the power electronic equipment adopts a cross-coupling decoupling control algorithm to obtain a three-phase voltage command value of the power electronic equipment, including:

[0013] Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller;

[0014] The difference between the positive-sequence dq-axis current command value and the obtained positive-sequence dq-axis current measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive-sequence dq-axis voltage command value of the power electronic equipment is obtained by using the cross-coupling decoupling control algorithm in combination with the cross-coupling term of the power electronic equipment in the dq-axis coordinate system;

[0015] According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

[0016] Optionally, the calculation formula corresponding to the cross-coupling decoupling control algorithm is as follows:

[0017]

[0018] in, represents the positive sequence d-axis voltage reference value; ω represents the angular velocity; L represents the equivalent inductance; Indicates the measured value of positive sequence q-axis current; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of positive sequence d-axis current; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0019] Optionally, the adopting a feedforward decoupling control algorithm for the inner loop controller to obtain a three-phase voltage command value of the power electronic equipment includes:

[0020] Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller;

[0021] The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current actual measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using a feedforward decoupling control algorithm;

[0022] According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

[0023] Optionally, the calculation formula corresponding to the feedforward decoupling control algorithm is as follows:

[0024]

[0025] in, Indicates the positive sequence d-axis voltage reference value; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0026] Optionally, the positive-sequence dq-axis current command value comprises: a positive-sequence d-axis current command value, a negative-sequence d-axis current command value, a positive-sequence q-axis current command value and a negative-sequence q-axis current command value;

[0027] The positive and negative sequence dq axis current measured values ​​include: positive sequence d axis current measured value, negative sequence d axis current measured value, positive sequence q axis current measured value and negative sequence q axis current measured value;

[0028] The positive and negative sequence dq axis voltage command values ​​include: a positive sequence dq axis voltage command value and a negative sequence dq axis voltage command value;

[0029] The positive-sequence dq-axis voltage command value comprises: a positive-sequence d-axis voltage command value and a positive-sequence q-axis voltage command value;

[0030] The negative-sequence dq-axis voltage command value comprises: a negative-sequence d-axis voltage command value and a negative-sequence q-axis voltage command value;

[0031] The three-phase voltage command value includes: a positive-sequence three-phase voltage command value and a negative-sequence three-phase voltage command value;

[0032] The three-phase voltage command value corresponding to the positive-sequence dq-axis voltage command value is the positive-sequence three-phase voltage command value;

[0033] The three-phase voltage command value corresponding to the negative-sequence dq-axis voltage command value is the negative-sequence three-phase voltage command value.

[0034] Optionally, the network-building control method adopts droop control;

[0035] The grid-following control method adopts constant DC voltage control, constant active power control or constant reactive power control.

[0036] Based on the same inventive concept, the present invention also provides a high-response speed power electronic equipment low voltage ride-through control system, comprising:

[0037] An operation mode selection module, used for selecting an operation mode of the outer loop controller of the power electronic equipment according to an access object of the outer loop controller;

[0038] A network control module, used for adopting a cross-coupling decoupling control algorithm for the inner loop controller of the power electronic equipment to obtain a three-phase voltage command value of the power electronic equipment when the operation mode of the outer loop controller adopts a network control mode;

[0039] A grid-following control module, used to apply a feedforward decoupling control algorithm to the inner-loop controller to obtain a three-phase voltage command value of the power electronic equipment when the outer-loop controller operates in a grid-following control mode;

[0040] A ride-through control module is used to perform low voltage ride-through control on the power electronic equipment according to the three-phase voltage command value.

[0041] Optionally, the operation mode selection module is specifically used to:

[0042] When the access object of the outer loop controller of the power electronic equipment is a new energy system or a passive system, the operation mode of the outer loop controller adopts a network-building control mode;

[0043] When the access object of the outer loop controller is an AC power grid, the operation mode of the outer loop controller adopts a grid-following control mode.

[0044] Optionally, the network control module is specifically used to:

[0045] Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller;

[0046] The difference between the positive-sequence dq-axis current command value and the obtained positive-sequence dq-axis current measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive-sequence dq-axis voltage command value of the power electronic equipment is obtained by using the cross-coupling decoupling control algorithm in combination with the cross-coupling term of the power electronic equipment in the dq-axis coordinate system;

[0047] According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

[0048] Optionally, the calculation formula corresponding to the cross-coupling decoupling control algorithm in the networking control module is as follows:

[0049]

[0050] in, represents the positive sequence d-axis voltage reference value; ω represents the angular velocity; L represents the equivalent inductance; Indicates the measured value of positive sequence q-axis current; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of positive sequence d-axis current; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0051] Optionally, the grid-following control module adopts a feedforward decoupling control algorithm for the inner loop controller to obtain a three-phase voltage command value of the power electronic equipment, including:

[0052] Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller;

[0053] The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current actual measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using a feedforward decoupling control algorithm;

[0054] According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

[0055] Optionally, the calculation formula corresponding to the feedforward decoupling control algorithm in the grid-following control module is as follows:

[0056]

[0057] in, Indicates the positive sequence d-axis voltage reference value; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0058] Optionally, the positive and negative sequence dq axis current command values ​​in the network control module include: a positive sequence d axis current command value, a negative sequence d axis current command value, a positive sequence q axis current command value and a negative sequence q axis current command value;

[0059] The positive and negative sequence dq axis current measured values ​​include: positive sequence d axis current measured value, negative sequence d axis current measured value, positive sequence q axis current measured value and negative sequence q axis current measured value;

[0060] The positive and negative sequence dq axis voltage command values ​​include: a positive sequence dq axis voltage command value and a negative sequence dq axis voltage command value;

[0061] The positive-sequence dq-axis voltage command value comprises: a positive-sequence d-axis voltage command value and a positive-sequence q-axis voltage command value;

[0062] The negative-sequence dq-axis voltage command value comprises: a negative-sequence d-axis voltage command value and a negative-sequence q-axis voltage command value;

[0063] The three-phase voltage command value includes: a positive-sequence three-phase voltage command value and a negative-sequence three-phase voltage command value;

[0064] The three-phase voltage command value corresponding to the positive-sequence dq-axis voltage command value is the positive-sequence three-phase voltage command value;

[0065] The three-phase voltage command value corresponding to the negative-sequence dq-axis voltage command value is the negative-sequence three-phase voltage command value.

[0066] Optionally, the network construction type control mode in the network construction control module adopts droop control;

[0067] The grid-following control method adopts constant DC voltage control, constant active power control or constant reactive power control.

[0068] In another aspect, the present invention further provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0069] The memory is used to store one or more programs;

[0070] When the one or more programs are executed by the at least one processor, the high-response-speed low voltage ride-through control method for power electronic equipment as described above is implemented.

[0071] On the other hand, the present invention further provides a computer-readable storage medium having an execution program stored thereon, and when the execution program is executed, the high-response-speed power electronic equipment low voltage ride-through control method as described above is implemented.

[0072] Compared with the prior art, the present invention has the following beneficial effects:

[0073] The present invention provides a high-response speed low voltage ride-through control method and system for power electronic equipment, comprising: selecting the operation mode of the outer loop controller according to the access object of the outer loop controller of the power electronic equipment; when the operation mode of the outer loop controller adopts a grid-forming control mode, adopting a cross-coupling decoupling control algorithm for the inner loop controller of the power electronic equipment to obtain a three-phase voltage command value of the power electronic equipment; when the operation mode of the outer loop controller adopts a grid-following control mode, adopting a feedforward decoupling control algorithm for the inner loop controller to obtain a three-phase voltage command value of the power electronic equipment; according to the three-phase voltage command value, performing low voltage ride-through control on the power electronic equipment; when the present application performs low voltage ride-through control on the power electronic equipment, by adopting different decoupling control algorithms for the inner loop controller according to the operation mode of the outer loop controller, it is beneficial to improve the control response speed of the power electronic equipment and realize rapid recovery of low voltage ride-through. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a flow chart of a low voltage ride-through control method for power electronic equipment with high response speed provided by the present invention;

[0075] Figure 2 It is a flowchart of a low voltage ride-through control method for power electronic equipment with high response speed provided by the present invention, wherein the outer loop control adopts a grid-building control strategy or a grid-following control;

[0076] Figure 3 It is a flow chart of two operation modes provided in a low voltage ride-through control method for power electronic equipment with high response speed provided by the present invention;

[0077] Figure 4 It is a control algorithm flow chart of setting an inner loop controller according to an operation mode in a low voltage ride-through control method for power electronic equipment with high response speed provided by the present invention;

[0078] Figure 5 This is a schematic diagram of the structure of a low voltage ride-through control system for power electronic equipment with high response speed provided by the present invention;

[0079] Figure 6 It is a schematic structural diagram of an electronic device in one embodiment of the present invention. DETAILED DESCRIPTION

[0080] The present invention provides a high-response speed low voltage ride-through control method and system for power electronic equipment. The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0081] Embodiment 1:

[0082] A high-response speed low voltage ride-through control method for power electronic equipment, the flow chart is as follows Figure 1 As shown, including:

[0083] Step 1: Select the operation mode of the outer loop controller according to the access object of the outer loop controller of the power electronic equipment;

[0084] Step 2: When the operation mode of the outer loop controller adopts the grid-type control mode, the inner loop controller of the power electronic equipment adopts the cross-coupling decoupling control algorithm to obtain the three-phase voltage command value of the power electronic equipment;

[0085] Step 3: When the outer loop controller operates in a grid-following control mode, a feedforward decoupling control algorithm is used for the inner loop controller to obtain the three-phase voltage command value of the power electronic equipment;

[0086] Step 4: Perform low voltage ride-through control on the power electronic equipment according to the three-phase voltage command value.

[0087] With the continuous development of power electronics technology, power electronic equipment has been widely used in various application scenarios, and its control speed is also constantly improving. Therefore, fast control has become the key to achieving efficient and stable operation of power electronic equipment. In order to meet the needs of fast control, high-speed processors and algorithms, as well as optimized control strategies, are needed to improve the accuracy and response speed of control. The access objects of the outer loop controller of existing power electronic equipment mainly include the following types: AC power grid (such as public power grid and microgrid), new energy system (such as wind power generation system and solar photovoltaic power generation system) and passive system (such as independent power grid and mobile power system). Since different access objects have different characteristics and requirements, these differences will affect the performance of power electronic equipment during low voltage ride-through, and then affect its support capacity for the power grid and the overall performance of the power system. Therefore, in order to ensure that power electronic equipment can effectively cope with the situation of grid voltage drop and improve the control response speed, it is necessary to select the corresponding operation mode for the access object of the outer loop controller of the power electronic equipment.

[0088] In one implementation, the process of selecting the operation mode of the outer loop controller according to the access object of the outer loop controller of the power electronic equipment in the above step 1 may include:

[0089] When the external loop controller of the power electronic equipment is connected to a new energy system or a passive system, the operation mode of the external loop controller adopts a network-based control mode; for example, Figure 2-Figure 3 As shown, when the outer loop controller is connected to a new energy system or a passive system, voltage-frequency control (Voltage-Frequency Control, also known as VF control, the control given values ​​are voltage and frequency) can be used as a grid-type controller. Specifically, droop control can be used as the control method of the grid-type controller. Droop control can adjust the active and reactive outputs of the system according to the changes in frequency and voltage in the power system, thereby achieving the stability of the power system. Droop control is a distributed control strategy that does not require a central controller, but adjusts the output based on local measurements, which makes it very suitable for new energy systems or passive systems with decentralization and uncertainty.

[0090] When the outer loop controller is connected to an AC power grid, the operation mode of the outer loop controller adopts a grid-following control mode. For example, when the outer loop controller is connected to an AC power grid, power control (Power Control, also known as PQ control, the control given values ​​are active power and reactive power) can be adopted as a grid-following controller. Specifically, a fixed DC voltage, a fixed active power strategy or a fixed reactive power strategy can be adopted as the control mode of the grid-following controller. The above control strategies can improve the overall stability of power electronic equipment when it is connected to the power grid, improve the power quality, and can respond to power grid dispatching commands by adjusting the active and reactive power outputs, thereby improving the flexibility of the system.

[0091] In the design process of power electronic equipment (such as power electronic converters, power electronic inverters and power electronic controllers), the inner loop controller of the power electronic equipment is generally set to a structure associated with the mathematical model of the control object. This is to achieve decoupling of the d-axis and the q-axis, so that the power electronic equipment has more control freedom and more precise control. However, in some scenarios, this decoupling cannot be fully realized. The main reason is that in some scenarios, the d-axis and q-axis of the inner loop controller of the power electronic equipment cannot be completely decoupled, and the response speed is very slow. The present invention adopts a meshed control method or one of the meshed control methods for the outer loop controller of the power electronic equipment with high response speed, and sets a corresponding decoupling control algorithm for the inner loop controller, so as to cope with the problem of rapid control of power electronic equipment in an environment where cross-decoupling is not possible.

[0092] In one implementation, the process of adopting a cross-coupling decoupling control algorithm for the inner loop controller of the power electronic equipment in the above step 2 to obtain the three-phase voltage command value of the power electronic equipment may include:

[0093] Based on the operation mode of the outer loop controller, the positive and negative sequence dq axis current command values ​​of the power electronic equipment are output through the outer loop controller;

[0094] The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and combined with the cross-coupling term of the power electronic equipment in the dq axis coordinate system, the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using the cross-coupling decoupling control algorithm;

[0095] According to the positive and negative sequence dq axis voltage command values, the corresponding three-phase voltage command values ​​are obtained through the coordinate system transformation in the inner loop controller;

[0096] For example, the positive and negative sequence dq axis current command values ​​mentioned above include: positive and negative sequence d axis current command values, positive and negative sequence q axis current command values;

[0097] The positive and negative sequence d-axis current command values ​​include: a positive sequence d-axis current command value and a negative sequence d-axis current command value;

[0098] The positive and negative sequence q-axis current command values ​​include: a positive sequence q-axis current command value and a negative sequence q-axis current command value;

[0099] The positive and negative sequence dq axis current measured values ​​include: the positive sequence d axis current measured value, the negative sequence d axis current measured value, the positive sequence q axis current measured value and the negative sequence q axis current measured value;

[0100] The positive and negative sequence dq axis voltage command values ​​include: a positive sequence dq axis voltage command value and a negative sequence dq axis voltage command value;

[0101] Positive-sequence dq-axis voltage command value, including: a positive-sequence d-axis voltage command value and a positive-sequence q-axis voltage command value;

[0102] Negative sequence dq axis voltage command value, including: negative sequence d axis voltage command value and negative sequence q axis voltage command value;

[0103] The three-phase voltage command value includes: a positive-sequence three-phase voltage command value and a negative-sequence three-phase voltage command value;

[0104] The three-phase voltage command value corresponding to the positive-sequence dq-axis voltage command value is the positive-sequence three-phase voltage command value;

[0105] The three-phase voltage command value corresponding to the negative-sequence dq-axis voltage command value is the negative-sequence three-phase voltage command value.

[0106] In this implementation, if Figure 4 As shown, by obtaining the operating mode of the outer-loop controller of the power electronic equipment at the current moment, when the outer-loop controller adopts a meshed control mode, the cross-coupling decoupling control algorithm (also known as the traditional current inner-loop algorithm) is used as the decoupling control algorithm of the inner-loop controller, and the positive-sequence d-axis voltage command value and the positive-sequence q-axis voltage command value output by the inner-loop controller are transformed from the dq coordinate system to the abc coordinate system (also known as the three-phase coordinate system) through coordinate transformation to form a positive-sequence command value; the negative-sequence d-axis voltage command value and the negative-sequence q-axis voltage command value output by the inner-loop controller are transformed from the dq coordinate system to the abc coordinate system through coordinate transformation to form a negative-sequence command value; in the control of power electronic equipment, it is necessary to convert between different coordinate systems to simplify the control strategy. Using the dq coordinate system (also called the rotating coordinate system) makes it easier to manage and control, and ultimately outputs four voltage command values ​​as a whole: positive-sequence q-axis voltage command value, positive-sequence d-axis voltage command value, negative-sequence q-axis voltage command value, and negative-sequence d-axis voltage command value. These voltage command values ​​are given in the dq coordinate system and need to be converted to the abc coordinate system for coordinate transformation, which makes the control strategy easier to interface with actual hardware and facilitates implementation.

[0107] In this implementation, the implementation process of the cross-coupling decoupling control algorithm may specifically include:

[0108] The difference between the positive and negative sequence d-axis current command value and the positive and negative sequence d-axis current measured value is used as the d-axis transfer function input;

[0109] The difference between the positive and negative sequence q-axis current command value and the positive and negative sequence q-axis current measured value is taken as the input of the q-axis transfer function;

[0110] The inner loop controller of the q-axis current and the inner loop controller of the d-axis current are Laplace transformed using the following transfer function:

[0111] G(S 1 )=KP 1 +Ki 1 ÷S 1 ;

[0112] Among them, G(S 1 ) is the Laplace operator S 1 The corresponding transfer function, KP 1 The Laplace operator is S 1 The corresponding proportionality coefficient, Ki 1 The Laplace operator is S 1 The corresponding integration coefficient, S 1 It is the Laplace operator under the cross-coupling decoupling control algorithm;

[0113] For example, the calculation formula corresponding to the above cross-coupling decoupling control algorithm is as follows:

[0114]

[0115] in, represents the positive sequence d-axis voltage reference value; ω represents the angular velocity; L represents the equivalent inductance; Indicates the measured value of positive sequence q-axis current; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of positive sequence d-axis current; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0116] In this implementation, when the control algorithm of the inner loop controller adopts the traditional current inner loop algorithm, by comparing the current command value with the current measured value and taking the difference as the input of the transfer function, the inner loop controller can effectively track the current command value and achieve fast response. The inner loop controller is usually implemented by a proportional-integral (PI) controller or its variant. In practical applications, even if the inner loop controller is designed to try to achieve complete orthogonal decoupling control, due to the inevitable existence of some coupling phenomena and nonlinear factors in the actual physical system, true complete decoupling is often difficult to achieve. In this case, by comparing the command value with the measured value and inputting the difference into the PI controller, effective control of the current can still be achieved and the purpose of fast response can be achieved.

[0117] In one implementation, the process of using a feedforward decoupling control algorithm for the inner loop controller in step 3 to obtain the three-phase voltage command value of the power electronic equipment may include:

[0118] Based on the operation mode of the outer loop controller, the positive and negative sequence dq axis current command values ​​of the power electronic equipment are output through the outer loop controller;

[0119] The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using the feedforward decoupling control algorithm;

[0120] According to the positive and negative sequence dq axis voltage command values, the corresponding three-phase voltage command values ​​are obtained through the coordinate system transformation in the inner loop controller; in this implementation, by obtaining the operation mode of the outer loop controller of the power electronic equipment at the current moment, when the outer loop controller adopts the grid-following control mode, the feedforward decoupling control algorithm (also known as the non-traditional current inner loop algorithm) is used as the decoupling control algorithm of the inner loop controller, and the negative sequence d axis voltage command value and the negative sequence q axis voltage command value output by the inner loop controller are transformed from the dq coordinate system to the abc coordinate system through coordinate transformation to form a negative sequence command value; the positive sequence d axis voltage command value and the positive sequence q axis voltage command value output by the inner loop controller are transformed from the dq coordinate system to the abc coordinate system through coordinate transformation to form a positive sequence command value;

[0121] In this implementation, the implementation process of the above feedforward decoupling control algorithm may specifically include:

[0122] The difference between the positive and negative sequence d-axis current command value and the d-axis current measured value is taken as the d-axis transfer function input;

[0123] The difference between the positive and negative sequence q-axis current command value and the q-axis current measured value is taken as the input of the q-axis transfer function;

[0124] The inner loop controller of the q-axis current and the inner loop controller of the d-axis current are Laplace transformed using the following transfer function:

[0125] G(S 2 )=KP 2 +Ki 2 ÷S 2 ;

[0126] Among them, G(S 2 ) is the Laplace operator S 2 The corresponding transfer function, KP 2 The Laplace operator is S 2 The corresponding proportionality coefficient, Ki 2 The Laplace operator is S 2 The corresponding integration coefficient, S 2 It is the Laplace operator under the feedforward decoupling control algorithm;

[0127] For example, the calculation formula corresponding to the above feedforward decoupling control algorithm is as follows:

[0128]

[0129] in, Indicates the positive sequence d-axis voltage reference value; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0130] In this implementation, by setting a non-traditional current inner loop algorithm, the inner loop controller can be decoupled from the dq axis. After decoupling, the proportional coefficient can be adjusted more significantly in the inner loop controller. 2) determines the degree to which the controller amplifies the error, which helps to reduce the response time of the system; and the integral coefficient (Ki 2 ) is used to eliminate steady-state errors and ensure that the system can accurately track the command value. By adjusting these two parameters, a balance can be found between fast response and steady-state accuracy. In addition, the inner-loop controller is usually combined with an outer-loop controller, which is usually generated based on the system state and target command and is responsible for generating current command values ​​to meet system-level performance requirements (such as speed, position or power control).

[0131] In this implementation, when the power system is running, it is crucial to obtain the current operating mode of the outer loop controller of the power electronic equipment to implement the appropriate control strategy. This involves monitoring the state of the system and selecting the appropriate control method according to the actual situation. The outer loop controller plays a vital role in the grid-connected control of the power system, and the operation mode of the outer loop controller will determine the configuration of the inner loop controller. When the outer loop controller adopts a grid-connected control mode (such as droop control), the traditional inner loop current control algorithm is adopted; when the outer loop controller implements a grid-following control strategy, it means that the system may need greater flexibility and adaptability to maintain or establish the shape and voltage level of the power grid. In this case, a non-traditional current inner loop algorithm may be more suitable. The non-traditional current inner loop algorithm may include more complex control algorithms, such as predictive control, adaptive control or optimization algorithms, to better adapt to changing grid conditions.

[0132] The present invention aims to solve the problem that the control response speed of the existing power electronic equipment is slow due to the inability to completely decouple the d-axis and the q-axis of the inner-loop controller. A low voltage ride-through control method for power electronic equipment with a high response speed is proposed. By setting the control strategy of the power electronic equipment with a high response speed, the control logic of the current inner loop is modified, and the overall coordinate transformation and command value setting are performed according to the voltage reference value output by the inner-loop controller using the traditional current inner-loop algorithm or the non-traditional current inner-loop algorithm. This method can cope with the problem of rapid control of the power electronic equipment by the inner-loop controller in an environment where cross-decoupling is not possible, and is beneficial to improving the control response speed of the power electronic equipment and realizing rapid recovery of low voltage ride-through.

[0133] Embodiment 2:

[0134] Based on the same inventive concept, the present invention also provides a high-response speed power electronic equipment low voltage ride-through control system, the structural composition diagram is as follows Figure 5 As shown, including:

[0135] An operation mode selection module, used for selecting an operation mode of the outer loop controller of the power electronic equipment according to an access object of the outer loop controller;

[0136] A network control module is used to adopt a cross-coupling decoupling control algorithm for the inner loop controller of the power electronic equipment when the operation mode of the outer loop controller adopts the network control mode, so as to obtain the three-phase voltage command value of the power electronic equipment;

[0137] A grid-following control module is used to adopt a feedforward decoupling control algorithm for the inner-loop controller when the outer-loop controller operates in a grid-following control mode, so as to obtain a three-phase voltage command value of the power electronic equipment;

[0138] The ride-through control module performs low voltage ride-through control on the power electronic equipment according to the three-phase voltage command values.

[0139] In one implementation, the operation mode selection module is specifically used to:

[0140] When the access object of the outer loop controller of the power electronic equipment is a new energy system or a passive system, the operation mode of the outer loop controller adopts a network-building control mode;

[0141] When the external loop controller is connected to an AC power grid, the operation mode of the external loop controller adopts a grid-following control mode.

[0142] In one implementation, the above-mentioned network control module is specifically used to:

[0143] Based on the operation mode of the outer loop controller, the positive and negative sequence dq axis current command values ​​of the power electronic equipment are output through the outer loop controller;

[0144] The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and combined with the cross-coupling term of the power electronic equipment in the dq axis coordinate system, the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using the cross-coupling decoupling control algorithm;

[0145] According to the positive and negative sequence dq axis voltage command values, the corresponding three-phase voltage command values ​​are obtained through the coordinate system transformation in the inner loop controller.

[0146] For example, the calculation formula corresponding to the cross-coupling decoupling control algorithm in the above-mentioned networking control module is as follows:

[0147]

[0148] in, represents the positive sequence d-axis voltage reference value; ω represents the angular velocity; L represents the equivalent inductance; Indicates the measured value of positive sequence q-axis current; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of positive sequence d-axis current; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0149] In one implementation, the process of adopting a feedforward decoupling control algorithm for the inner loop controller in the above-mentioned grid-following control module to obtain the three-phase voltage command value of the power electronic equipment may include:

[0150] Based on the operation mode of the outer loop controller, the positive and negative sequence dq axis current command values ​​of the power electronic equipment are output through the outer loop controller;

[0151] The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using the feedforward decoupling control algorithm;

[0152] According to the positive and negative sequence dq axis voltage command values, the corresponding three-phase voltage command values ​​are obtained through the coordinate system transformation in the inner loop controller.

[0153] For example, the calculation formula corresponding to the feedforward decoupling control algorithm in the above-mentioned grid control module is as follows:

[0154]

[0155] in, Indicates the positive sequence d-axis voltage reference value; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of the positive sequence q-axis current; qrr +Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

[0156] For example, the positive and negative sequence dq axis current command values ​​in the above-mentioned network control module include: a positive sequence d axis current command value, a negative sequence d axis current command value, a positive sequence q axis current command value and a negative sequence q axis current command value;

[0157] Positive and negative sequence dq axis current measured values, including: positive sequence d axis current measured value, negative sequence d axis current measured value, positive sequence q axis current measured value and negative sequence q axis current measured value;

[0158] Positive and negative sequence dq axis voltage command values, including: positive sequence dq axis voltage command value and negative sequence dq axis voltage command value;

[0159] Positive-sequence dq-axis voltage command value, including: a positive-sequence d-axis voltage command value and a positive-sequence q-axis voltage command value;

[0160] Negative sequence dq axis voltage command value, including: negative sequence d axis voltage command value and negative sequence q axis voltage command value;

[0161] The three-phase voltage command value includes: a positive-sequence three-phase voltage command value and a negative-sequence three-phase voltage command value;

[0162] The three-phase voltage command value corresponding to the positive-sequence dq-axis voltage command value is the positive-sequence three-phase voltage command value;

[0163] The three-phase voltage command value corresponding to the negative-sequence dq-axis voltage command value is the negative-sequence three-phase voltage command value.

[0164] For example, the network construction control mode in the above-mentioned network construction control module can adopt droop control;

[0165] For example, the above-mentioned grid-following control method can adopt constant DC voltage control, constant active power control or constant reactive power control.

[0166] Through a series of modular designs, a system suitable for different structures is realized, which can achieve closed-loop, reliable and efficient execution through collection, analysis and control.

[0167] Embodiment 3:

[0168] like Figure 6As 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 600 in this embodiment is coupled to one or more (only one is shown in the figure) processors 602, a memory 604, and a wireless module 606. The memory 604 stores a program that can execute the content of the aforementioned embodiment, and the processor 602 can execute the program stored in the memory 604.

[0169] Among them, the processor 602 may include one or more processing cores. The processor 602 uses various interfaces and lines to connect various parts of the entire electronic device 600, and executes various functions and processes data of the electronic device 600 by running or executing instructions, programs, code sets or instruction sets stored in the memory 604, and calling data stored in the memory 604. Optionally, the processor 602 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 602 can integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processing unit (Graphics Processing Unit, GPU) and a modem. Among them, the CPU mainly processes the operating system, user interface and target application program, etc.; the GPU is responsible for rendering and drawing the display content; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor 902, and it can be implemented separately through a communication chip.

[0170] The memory 604 may include a random access memory (RAM) or a read-only memory (ROM). The memory 604 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 604 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the following various method embodiments, etc. The data storage area may also store data (such as the aforementioned text document) created by the electronic device 600 during use, etc.

[0171] The wireless module 606 is used to receive and send electromagnetic waves, realize the mutual conversion between electromagnetic waves and electrical signals, and thus communicate with a communication network or other devices, such as communicating with a base station based on a mobile communication protocol. The wireless module 606 may include various existing circuit elements for performing these functions, such as antennas, radio frequency transceivers, digital signal processors, encryption / decryption chips, user identity modules (SIM) cards, memories, and the like. The wireless module 606 may communicate with various networks such as the Internet, corporate intranets, wireless networks, or communicate with other electronic devices through wireless networks. The above-mentioned wireless networks may include cellular telephone networks, wireless local area networks, or metropolitan area networks. The above-mentioned wireless networks may use various communication standards, protocols, and technologies, including but not limited to WLAN protocols and Bluetooth protocols, and may even include protocols that have not yet been developed. It may include a processor, a memory, a transceiver component, and the like. 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 instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when executing instructions.

[0172] 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 gates 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, and is specifically suitable for loading and executing one or more instructions in a storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of a high-response speed power electronic equipment low voltage ride-through control method in the above-mentioned embodiment.

[0173] Embodiment 4:

[0174] 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 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, such as at least one disk memory. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a low voltage ride-through control method for a high response speed power electronic equipment in the above embodiment.

[0175] 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.

[0176] 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.

[0177] 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 1A function specified in one or more boxes.

[0178] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0179] 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 high-response speed low voltage ride-through control method for power electronic equipment, characterized in that: include: Selecting an operation mode of the outer loop controller of the power electronic equipment according to an access object of the outer loop controller; When the operation mode of the outer loop controller adopts the grid-type control mode, a cross-coupling decoupling control algorithm is adopted for the inner loop controller of the power electronic equipment to obtain a three-phase voltage command value of the power electronic equipment; When the outer loop controller operates in a grid-following control mode, a feedforward decoupling control algorithm is used on the inner loop controller to obtain a three-phase voltage command value of the power electronic equipment; According to the three-phase voltage command values, low voltage ride-through control is performed on the power electronic equipment.

2. The method according to claim 1, characterized in that The selecting, according to the access object of the outer loop controller of the power electronic equipment, the operation mode of the outer loop controller comprises: When the access object of the outer loop controller of the power electronic equipment is a new energy system or a passive system, the operation mode of the outer loop controller adopts a network-building control mode; When the access object of the outer loop controller is an AC power grid, the operation mode of the outer loop controller adopts a grid-following control mode.

3. The method according to claim 1, characterized in that The inner loop controller of the power electronic equipment adopts a cross-coupling decoupling control algorithm to obtain a three-phase voltage command value of the power electronic equipment, including: Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller; The difference between the positive-sequence dq-axis current command value and the obtained positive-sequence dq-axis current actual measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive-sequence dq-axis voltage command value of the power electronic equipment is obtained by using the cross-coupling decoupling control algorithm in combination with the cross-coupling term of the power electronic equipment in the dq-axis coordinate system; According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

4. The method according to claim 3, characterized in that The calculation formula corresponding to the cross-coupling decoupling control algorithm is as follows: in, represents the positive sequence d-axis voltage reference value; ω represents the angular velocity; L represents the equivalent inductance; Indicates the measured value of positive sequence q-axis current; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of positive sequence d-axis current; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

5. The method according to claim 1, characterized in that The inner loop controller adopts a feedforward decoupling control algorithm to obtain a three-phase voltage command value of the power electronic equipment, including: Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller; The difference between the positive and negative sequence dq axis current command value and the obtained positive and negative sequence dq axis current actual measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive and negative sequence dq axis voltage command value of the power electronic equipment is obtained by using a feedforward decoupling control algorithm; According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

6. The method according to claim 5, characterized in that The calculation formula corresponding to the feedforward decoupling control algorithm is as follows: in, Indicates the positive sequence d-axis voltage reference value; Indicates the measured value of the positive sequence d-axis current; drr + Indicates the positive sequence d-axis current command value; Indicates the negative sequence d-axis voltage reference value; Indicates the measured value of negative sequence d-axis current; drr - Indicates the negative sequence d-axis current command value; Indicates the positive sequence q-axis voltage reference value; Indicates the measured value of the positive sequence q-axis current; qrr + Indicates the positive sequence q-axis current command value; Indicates the negative sequence q-axis voltage reference value; Indicates the measured value of negative sequence q-axis current; qrr - Indicates the negative-sequence q-axis current command value.

7. The method according to claim 3 or 5, characterized in that The positive and negative sequence dq axis current command values ​​include: a positive sequence d axis current command value, a negative sequence d axis current command value, a positive sequence q axis current command value and a negative sequence q axis current command value; The positive and negative sequence dq axis current measured values ​​include: positive sequence d axis current measured value, negative sequence d axis current measured value, positive sequence q axis current measured value and negative sequence q axis current measured value; The positive and negative sequence dq axis voltage command values ​​include: a positive sequence dq axis voltage command value and a negative sequence dq axis voltage command value; The positive-sequence dq-axis voltage command value comprises: a positive-sequence d-axis voltage command value and a positive-sequence q-axis voltage command value; The negative-sequence dq-axis voltage command value comprises: a negative-sequence d-axis voltage command value and a negative-sequence q-axis voltage command value; The three-phase voltage command value includes: a positive-sequence three-phase voltage command value and a negative-sequence three-phase voltage command value; The three-phase voltage command value corresponding to the positive-sequence dq-axis voltage command value is the positive-sequence three-phase voltage command value; The three-phase voltage command value corresponding to the negative-sequence dq-axis voltage command value is the negative-sequence three-phase voltage command value.

8. The method according to claim 1, characterized in that The grid-forming control method adopts droop control; The grid-following control method adopts constant DC voltage control, constant active power control or constant reactive power control.

9. A high-response-speed power electronic equipment low voltage ride-through control system, characterized in that: include: An operation mode selection module: used to select an operation mode of the outer loop controller of the power electronic equipment according to an access object of the outer loop controller; A network control module, used for adopting a cross-coupling decoupling control algorithm for the inner loop controller of the power electronic equipment to obtain a three-phase voltage command value of the power electronic equipment when the operation mode of the outer loop controller adopts a network control mode; A grid-following control module, used to apply a feedforward decoupling control algorithm to the inner-loop controller to obtain a three-phase voltage command value of the power electronic equipment when the outer-loop controller operates in a grid-following control mode; A ride-through control module is used to perform low voltage ride-through control on the power electronic equipment according to the three-phase voltage command value.

10. The system according to claim 9, characterized in that The operation mode selection module is specifically used for: When the access object of the outer loop controller of the power electronic equipment is a new energy system or a passive system, the operation mode of the outer loop controller adopts a network-building control mode; When the access object of the outer loop controller is an AC power grid, the operation mode of the outer loop controller adopts a grid-following control mode.

11. The system according to claim 9, characterized in that The network control module is specifically used for: Based on the operation mode of the outer loop controller, outputting the positive and negative sequence dq axis current command values ​​of the power electronic equipment through the outer loop controller; The difference between the positive-sequence dq-axis current command value and the obtained positive-sequence dq-axis current actual measured value of the power electronic equipment is used as the input of the transfer function of the inner loop controller of the power electronic equipment, and the positive-sequence dq-axis voltage command value of the power electronic equipment is obtained by using the cross-coupling decoupling control algorithm in combination with the cross-coupling term of the power electronic equipment in the dq-axis coordinate system; According to the positive and negative sequence dq axis voltage command values, corresponding three-phase voltage command values ​​are obtained through coordinate system transformation in the inner loop controller.

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, a high-response-speed power electronic equipment low voltage ride-through control method as claimed in any one of claims 1 to 8 is implemented.

13. A computing device readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, a low voltage ride-through control method for power electronic equipment with high response speed as described in any one of claims 1 to 8 is implemented.

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