A converter control device, a control method, an electronic device and a medium

Abstract

The present invention relates to a converter control device, a control method, an electronic device and a medium. The device includes a grid connection point voltage detection device, a system fault detection module, a converter control module and an adaptive current control module. The fault type and severity are identified by a fault type identification module, the adaptive parameter adjustment module dynamically adjusts the current command according to the fault situation, the dynamic control algorithm is adjusted according to real-time data, and the parameter feedback and optimization part is optimized in real time, so that the system has high adaptability and response speed under various complex fault conditions. The calculation of the adjustment coefficient ensures that the current command accurately reflects the fault characteristics and improves the stability and reliability of the system. The device enables the converter to simulate the current output characteristics of the synchronous motor to a certain extent, so that the converter has a grid support capability similar to that of the synchronous motor.

Description

Technical Field

[0001] This invention relates to the field of power system control technology, and in particular to a converter control device, control method, electronic device and medium. Background Technology

[0002] In modern power systems, converters (also known as inverters) are core devices for power conversion and are widely used in various scenarios such as wind power generation, solar power generation, rail transportation, and industrial drive systems. With the development of new energy technologies and the expansion of their application scale, the performance and stability requirements of converters are becoming increasingly stringent. In particular, the rapid response and reliable operation of converters are crucial in dealing with transient operating conditions and faults.

[0003] The stable operation of a power system depends on the coordinated work of all its components, and the converter, as a key component of power electronic equipment, directly affects the reliability and efficiency of the entire system. In wind and solar power systems, converters not only need to convert the direct current (DC) generated by renewable energy into alternating current (AC) that meets grid requirements, but also need to respond quickly and adjust their operating status when grid fluctuations or faults occur to ensure stable system operation. Furthermore, in power transmission, converters are also used in high-voltage direct current (HVDC) transmission systems, reducing transmission losses and improving transmission efficiency through efficient DC transmission.

[0004] During operation, power systems frequently encounter various transient conditions, such as short-circuit faults, sudden load changes, and voltage sags. These transient conditions pose significant challenges to converter performance. Short-circuit faults cause a sudden surge in current, potentially damaging the power devices inside the converter; sudden load changes cause drastic fluctuations in voltage and current, affecting the normal operation of the converter; voltage sags may prevent the converter from maintaining a stable output, impacting the overall stability of the power system. To address these challenges, converters need the ability to quickly detect faults and rapidly adjust their operating modes. When a fault occurs, they must be able to switch to an appropriate operating mode to protect themselves and the system, and quickly return to normal operation after the fault is cleared. This requires converters to not only have efficient control algorithms but also real-time detection and dynamic adjustment capabilities.

[0005] Existing converter control methods suffer from several major problems when handling transient conditions. First, detection and response speeds are insufficient. Many traditional converter control methods rely on detection mechanisms based on fixed thresholds, which often fail to detect and accurately determine the fault type and severity in a timely manner when a fault occurs. This results in the converter's inability to respond quickly, increasing system instability and potential risks. Second, the switching of operating modes is not flexible enough. Existing converter control methods typically switch to preset operating modes when a fault occurs. However, due to the diversity of fault types and severity, preset modes cannot adapt to all situations, meaning that under some severe faults, the converter may still fail to effectively protect itself and the system. Third, current command generation has problems under transient conditions. Existing converter control methods typically generate current commands based on static models, failing to fully consider the dynamic changes in grid parameters during a fault. Current commands generated by such static models cannot effectively cope with complex current fluctuations caused by faults, leading to a mismatch between the converter output current and actual demand, affecting system stability and reliability. Finally, traditional converter control methods lack adaptive capabilities. When a fault occurs, they cannot dynamically adjust control parameters according to the actual situation. This makes the converter lack flexibility and adaptability when facing faults of different types and severity, and it cannot achieve the best fault response effect.

[0006] In receiving-end power grids fed by multiple DC transmission systems, such as the East China Power Grid and the Central Hunan Power Grid, the low proportion of traditional synchronous machines often leads to insufficient dynamic reactive power support. If large disturbances occur, such as AC-side system faults or DC transmission system shutdowns, the receiving-end power grid may experience voltage instability issues, including voltage collapse, due to insufficient dynamic reactive power. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention proposes a converter control device suitable for transient operating conditions. This device allows the converter to simulate the current output characteristics of a synchronous motor to a certain extent, thereby enabling the converter to possess grid support capabilities similar to those of a synchronous motor. The control device proposed in this invention includes: a grid connection point voltage detection device for real-time monitoring of the grid connection point voltage and transmitting the voltage signal to a system fault detection module; a system fault detection module for comparing the voltage signal with a preset voltage threshold and generating a corresponding fault signal; a converter control module for adjusting the converter's operating mode according to the fault signal; and an adaptive current control module for dynamically adjusting the converter's initial current command according to the fault type and severity when a system fault occurs.

[0008] Under system fault operation mode, the initial current command of the converter is shown in formula (1) and formula (2):

[0009] Formula (1):

[0010]

[0011] Formula (2):

[0012]

[0013] The meanings of the parameters in formulas (1) and (2) are as follows:

[0014] and These represent the reference currents for the d-axis and q-axis, respectively.

[0015] The no-load electromotive force of the synchronous motor before a short circuit can be calculated based on the operating characteristics and typical parameters of the synchronous motor, and then used in the converter control device.

[0016] The dq-axis component of the short-circuit front-end voltage after Park transformation can be calculated based on the operating characteristics and typical parameters of the synchronous motor, and then used in the converter control device.

[0017] The time constant of the excitation winding under stator short-circuit conditions can be selected with reference to the typical parameters of synchronous motors, and then used in the converter control device;

[0018] The decay time constants of the DC component and the frequency-doubled AC component can be selected with reference to the typical parameters of the synchronous motor, and then used in the converter control device.

[0019] The stator direct-axis and quadrature-axis operational reactances can be selected with reference to the typical parameters of synchronous motors, and then used in the converter control device;

[0020] Direct-axis transient reactance can be selected with reference to typical parameters of synchronous motors, and then used in converter control devices;

[0021] t: time.

[0022] Attenuation factor in the formula and This is achieved by an attenuation stage, which includes...

[0023] The system fault detection section is used to generate trigger signals;

[0024] A step signal generator is used to generate a unit step signal.

[0025] A first-order inertial element is used to generate a first-order inertial response;

[0026] The addition and subtraction section is used to subtract the number 1 from the first-order inertial response to obtain the final attenuation factor;

[0027] As shown in formula (1), the d-axis current command has two attenuation factors, which need to be generated by two attenuation stages respectively; the time constant of the first-order inertial stage contained in one of the attenuation stages is... The time constant of the first-order inertial element contained in the other decay stage is... As shown in formula (2), the q-axis current command contains only one attenuation factor and requires only one attenuation stage; the time constant of the first-order inertial stage in the attenuation stage is... .

[0028] The adaptive current control module includes:

[0029] The fault type identification module is used to identify the fault type and severity.

[0030] An adaptive parameter adjustment module is used to dynamically adjust the parameters in the current command expression according to the fault type and severity.

[0031] The dynamic control algorithm module is used to dynamically adjust the current command based on real-time monitored data;

[0032] The parameter feedback and optimization section is used to monitor the output current in real time and optimize the parameters.

[0033] The specific current command adjusted according to the adaptive current control module is as follows:

[0034] Adjusted d-axis current command expression:

[0035]

[0036] Adjusted q-axis current command expression:

[0037]

[0038] in:

[0039] The no-load electromotive force before the short circuit is determined by the fault severity coefficient. The adjustment coefficient k1 is dynamically adjusted.

[0040] The q-axis component of the short-circuit front-end voltage is determined based on the fault type coefficient. The adjustment coefficient k2 is dynamically adjusted.

[0041] The d-axis component of the short-circuit front-end voltage is determined based on the fault location coefficient. The adjustment coefficient k3 is dynamically adjusted.

[0042] The adjustment factor is based on the fault severity factor. Fault type coefficient and fault location coefficient Determine the adjustment coefficient k 1、 The specific values ​​of k2 and k3; the formula for calculating the adjustment coefficient is as follows:

[0043]

[0044] in, , and This is the initial adjustment factor.

[0045] The system fault detection module generates corresponding fault signals, which further include determining that the system is fault-free when the voltage signal is higher than a set threshold, and determining that the system has a fault when the voltage signal is lower than the set threshold.

[0046] The fault types include short circuit, overload, or overtemperature.

[0047] Furthermore, the present invention also provides a method for control using a converter control device, comprising:

[0048] The voltage at the grid connection point is monitored in real time by the grid connection point voltage detection device of the converter control device, and the voltage signal is transmitted to the system fault detection module of the converter control device.

[0049] The system fault detection module compares the voltage signal with a preset voltage threshold and generates a corresponding fault signal.

[0050] The converter control module of the converter control device adjusts the operating mode of the converter according to the fault signal.

[0051] When a system fault occurs, the adaptive current control module of the converter control device dynamically adjusts the initial current command of the converter according to the fault type and severity.

[0052] The converter control device is one of the converter control devices described above.

[0053] The initial current command is shown in formulas (1) and (2):

[0054] Formula (1):

[0055]

[0056] Formula (2):

[0057]

[0058] The meanings of the parameters in formulas (1) and (2) are as follows:

[0059] and These represent the reference currents for the d-axis and q-axis, respectively.

[0060] : The no-load electromotive force of the synchronous motor before short circuit;

[0061] dq-axis components of the short-circuit front-end voltage after Park transformation;

[0062] : The time constant of the excitation winding under stator short-circuit conditions;

[0063] The decay time constants of the DC component and the harmonic AC component;

[0064] Stator direct-axis and quadrature-axis operational reactances;

[0065] Direct-axis transient reactance;

[0066] t: time.

[0067] Attenuation factor in the formula and This is achieved by an attenuation stage, which includes: a system fault detection section for generating a trigger signal;

[0068] A step signal generator is used to generate a unit step signal.

[0069] A first-order inertial element is used to generate a first-order inertial response;

[0070] The addition and subtraction section is used to subtract the number 1 from the first-order inertial response to obtain the final attenuation factor;

[0071] As shown in formula (1), the d-axis current command has two attenuation factors, which need to be generated by two attenuation stages respectively; the time constant of the first-order inertial stage contained in one of the attenuation stages is... The time constant of the first-order inertial element contained in the other decay stage is... As shown in formula (2), the q-axis current command contains only one attenuation factor and requires only one attenuation stage; the time constant of the first-order inertial stage in the attenuation stage is... .

[0072] The adaptive current control module of the converter control device dynamically adjusts the initial current command of the converter according to the fault type and severity when a system fault occurs, including:

[0073] The fault type and severity are identified through the fault type identification module of the adaptive current control module;

[0074] The adaptive parameter adjustment module of the adaptive current control module dynamically adjusts the parameters in the current command expression according to the fault type and severity.

[0075] The adaptive current control module dynamically adjusts the current command based on real-time monitored data through its dynamic control algorithm module.

[0076] The adaptive current control module monitors the output current in real time and optimizes the parameters through parameter feedback and optimization.

[0077] The specific current command adjusted according to the adaptive current control module is as follows:

[0078] Adjusted d-axis current command expression:

[0079]

[0080] Adjusted q-axis current command expression:

[0081]

[0082] in:

[0083] The no-load electromotive force before the short circuit is determined by the fault severity coefficient. The adjustment coefficient k1 is dynamically adjusted.

[0084] The q-axis component of the short-circuit front-end voltage is determined based on the fault type coefficient. The adjustment coefficient k2 is dynamically adjusted.

[0085] The d-axis component of the short-circuit front-end voltage is determined based on the fault location coefficient. The adjustment coefficient k3 is dynamically adjusted.

[0086] The process of comparing the voltage signal with a preset voltage threshold through the system fault detection module to generate a corresponding fault signal includes:

[0087] When the voltage signal is higher than the set threshold, the system fault detection module determines that the system is fault-free; when the voltage signal is lower than the set threshold, the system fault detection module determines that the system has a fault.

[0088] In another aspect, this application also provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0089] The memory is used to store one or more programs;

[0090] When the one or more programs are executed by the at least one processor, a method for controlling an applied converter control device as described above is implemented.

[0091] In another aspect, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements a method for control using a converter control device as described above.

[0092] Beneficial effects:

[0093] The converter control device in this invention generates current commands by referencing the current output characteristics of a synchronous motor under transient operating conditions. A fault type identification module identifies the fault type and severity, and an adaptive parameter adjustment module dynamically adjusts the current command parameters based on these factors. Adjustments are made based on real-time monitoring data, with real-time optimization of the parameter feedback and optimization components. This allows the converter to simulate the current output characteristics and transient support function of a synchronous motor to a certain extent, and to adapt to various complex fault conditions.

[0094] When a system fault occurs, the adaptive current control module calculates adjustment coefficients to ensure that the current command adjustment accurately reflects the severity, type, and location of the fault. Whether it is a short circuit, overload, or overtemperature, the converter can accurately identify and adjust accordingly, improving the converter's reliability.

[0095] Furthermore, this invention provides a complete calculation method for fault severity coefficient, fault type coefficient, and fault location coefficient. Through these calculations, the system can flexibly adjust current command parameters under different fault conditions, ensuring the stability and accuracy of the converter output current. This flexible adjustment capability enables the converter to better cope with complex situations, ensuring the stable operation of the power system.

[0096] In summary, this invention improves the adaptability, transient support capability, and response speed of the converter. Through precise adjustment and flexible parameter regulation, it ensures the high reliability and stability of the converter, providing strong support for the stable operation of the power system. Attached Figure Description

[0097] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, are not intended to unduly limit the invention. In the drawings:

[0098] Figure 1This is a structural block diagram of the controller device of the present invention;

[0099] Figure 2 This is a structural block diagram of the attenuation stage of the present invention;

[0100] Figure 3 This is a structural block diagram of the adaptive current control module of the present invention;

[0101] Figure 4 This is a schematic diagram of an electronic device structure according to the present invention. Detailed Implementation

[0102] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0103] This invention provides a converter control device. It includes a detection device that detects the grid connection point voltage to determine if a system fault has occurred. When the grid connection point voltage is higher than a set threshold, the system is considered to be in a fault-free state; when the grid connection point voltage is lower than the set threshold, the system is considered to have a fault. Based on the detection results, the converter's operating mode is adjusted: when the system is fault-free, the converter operates in normal mode; when a system fault occurs, the converter switches to fault operation mode. Furthermore, in fault operation mode, an adaptive current control module dynamically adjusts parameters in the current command expression, such as the no-load electromotive force before a short circuit and the dq-axis component, according to the type and severity of the fault. Through these adjustments, the adaptive current control module can better adapt to transient conditions under different fault scenarios, thereby improving the system's response speed and stability, ensuring that the converter can effectively support the system voltage under various fault conditions, and contributing to the stable operation of the power system.

[0104] Specific embodiments are as follows: Embodiment 1

[0105] 1. System Architecture

[0106] like Figure 1 As shown, this system includes a grid connection point voltage detection device, a system fault detection module, a converter control module, and an adaptive current control module.

[0107] 1.1 Grid Connection Point Voltage Detection Device

[0108] The grid connection point voltage detection device is used to monitor the voltage at the grid connection point in real time and transmit the voltage signal to the system fault detection module. This device ensures the accuracy and real-time performance of the voltage signal through high-precision sensors and a data acquisition system.

[0109] 1.2 System Fault Detection Module

[0110] The system fault detection module receives voltage signals from the grid connection point voltage detection device and compares them with preset voltage thresholds. When the voltage signal is higher than the set threshold, the module determines that the system is fault-free; when the voltage signal is lower than the set threshold, the module determines that the system has a fault. Based on the determination result, the module generates a corresponding fault signal.

[0111] 1.3 Converter Control Module

[0112] The converter control module adjusts the converter's operating mode based on the fault signal generated by the system fault detection module. When the system is fault-free, the converter operates in normal mode to ensure stable power transmission and conversion; when a system fault occurs, the converter switches to fault operation mode to cope with abnormal system conditions, protect equipment, and maintain system stability.

[0113] 1.4 Adaptive Current Control Module

[0114] When a system fault occurs, the adaptive current control module dynamically adjusts the converter's current command based on the fault type and severity. This module includes fault type identification, parameter adjustment, and a dynamic control algorithm. By monitoring and analyzing the system status in real time, the adaptive current control module can flexibly adjust control parameters, optimize current output, and improve the system's stability and response speed under fault conditions.

[0115] System Workflow

[0116] 1. Voltage monitoring: The grid connection point voltage detection device monitors the grid connection point voltage in real time and transmits the data to the system fault detection module.

[0117] 2. Fault diagnosis: The system fault detection module determines whether a fault has occurred in the system based on the received voltage signal and generates a corresponding fault signal.

[0118] 3. Mode Switching: The converter control module adjusts the converter's operating mode based on fault signals. When the system is fault-free, the converter operates in normal mode; when a system fault occurs, the converter switches to fault operation mode.

[0119] 4. Current regulation: In the event of a system fault, the adaptive current control module dynamically adjusts the current command according to the fault type and severity, optimizes the converter's output current, and supports stable system operation.

[0120] Through the above-described embodiments, this invention achieves rapid response and adaptive control of the converter under transient operating conditions, improving the stability and reliability of the power system under fault conditions. This method has high practical value and can be widely applied to various complex power systems.

[0121] 2. Fault detection and operating mode switching

[0122] The system fault detection module receives the grid connection point voltage signal and compares it with a preset voltage threshold. When the grid connection point voltage falls below the set threshold, the module determines that a system fault has occurred and generates a corresponding fault signal. Upon receiving the fault signal, the converter control module immediately switches the converter's operating mode from normal mode to fault operation mode.

[0123] In fault operation mode, the converter will output current according to a specified stator current expression. This adjustment aims to enable the converter to simulate the transient support function of a synchronous motor, thereby improving the converter's ability to support the system under fault conditions and enhancing the system's stability and reliability.

[0124] Specifically, after receiving the grid connection point voltage signal, the system fault detection module quickly and accurately determines the system's operating status by comparing the signal with a preset voltage threshold. Once a voltage drop below the threshold is detected, the system fault detection module immediately generates a fault signal and transmits it to the converter control module. Upon receiving the fault signal, the converter control module rapidly switches its operating mode to adjust the output current in the shortest possible time to meet system requirements under fault conditions.

[0125] In this way, the converter can quickly respond and output current adapted to transient conditions when a system fault occurs, improving the system's dynamic reactive power support capability and preventing stability problems such as voltage collapse. This design not only improves the system's safety and reliability but also enhances the converter's adaptability to various complex power systems.

[0126] 3. Initial current command generation

[0127] In the system fault operation mode, the initial current command of the converter is generated as shown in formulas (1) and (2):

[0128] Formula (1):

[0129]

[0130] Formula (2):

[0131]

[0132] The meanings of the parameters in formulas (1) and (2) are as follows:

[0133] The no-load electromotive force of the synchronous motor before a short circuit can be calculated based on the operating characteristics and typical parameters of the synchronous motor, and then used in the converter control device.

[0134] The dq-axis component of the short-circuit front-end voltage after Park transformation can be calculated based on the operating characteristics and typical parameters of the synchronous motor, and then used in the converter control device.

[0135] The time constant of the excitation winding under stator short-circuit conditions can be selected with reference to the typical parameters of synchronous motors, and then used in the converter control device;

[0136] The decay time constants of the DC component and the frequency-doubled AC component can be selected with reference to the typical parameters of the synchronous motor, and then used in the converter control device.

[0137] The stator direct-axis and quadrature-axis operational reactances can be selected with reference to the typical parameters of synchronous motors, and then used in the converter control device;

[0138] Direct-axis transient reactance can be selected with reference to typical parameters of synchronous motors, and then used in converter control devices;

[0139] t: time.

[0140] Using the above formula, the current command required by the converter can be accurately calculated when a fault occurs, ensuring that the converter can output current according to the stator current expression under the transient operating conditions of the synchronous motor. This allows the converter to simulate the current output characteristics of the synchronous motor to a certain extent and effectively support the system voltage.

[0141] in, and These represent the reference currents for the d-axis and q-axis, respectively. These current commands are based on the no-load electromotive force of the synchronous motor before short-circuiting. And the dq-axis components of the short-circuit front-end voltage obtained after Park transformation. It is calculated based on the time constant of the excitation winding under stator short-circuit conditions. The decay time constants of the DC component and the harmonic AC component This is used to adjust the time dynamic characteristics of the current command.

[0142] By using these parameters, the converter can simulate the behavior of a synchronous motor under transient conditions, providing precise current output and ensuring that the output current can be adjusted quickly and accurately in the event of a system fault, thus supporting the stability and reliability of the system. This design not only improves the converter's adaptability, transient support capability, and response speed, but also enhances its application value in complex power systems.

[0143] 4. Calculation of Attenuation Factor

[0144] As attached Figure 2 As shown, the attenuation factor in formulas (1) and (2) consists of a system fault detection section, a step signal generator, a first-order inertial element, and an addition / subtraction operation section. The fault detection section generates a trigger signal to trigger the step signal generator to generate a unit step signal. The unit step signal generated by the step signal generator passes through the first-order inertial element to obtain a first-order inertial response. The addition / subtraction operation section subtracts the number 1 from the first-order inertial response to obtain the final attenuation factor.

[0145] The expression for the converter output current command includes two attenuation factors. , The generation of the d-axis current command requires both of the aforementioned attenuation factors, while the generation of the q-axis current command only requires one. This is an attenuation factor. The attenuation factor used to generate the d-axis current command has the following time constants for its first-order inertial element: and The attenuation factor used to generate the q-axis current command has a time constant of its first-order inertial element. .

[0146] The specific calculation steps are as follows:

[0147] 1. Fault signal generation: After the system fault detection part detects a fault, it generates a trigger signal.

[0148] 2. Step signal generation: The trigger signal activates the step signal generator to generate a unit step signal.

[0149] 3. Inertial Response Generation: A unit step signal passing through a first-order inertial element produces a first-order inertial response. The time constant of the inertial response... and Current command generation for the d-axis and q-axis.

[0150] 4. Attenuation factor calculation: The addition and subtraction part subtracts the number 1 from the first-order inertial response to obtain the final attenuation factor.

[0151] Through these steps, the attenuation factor can accurately reflect the transient response characteristics of the system. Under fault conditions, using these attenuation factors, the converter can generate precise current commands to ensure that its output current can simulate the behavior of a synchronous motor under transient conditions, thereby effectively supporting the system voltage.

[0152] This design, through precise calculation of the attenuation factor, enhances the converter's adaptability, transient support capability, and response speed under complex fault conditions, thereby improving the system's stability and reliability.

[0153] Example 2 Adaptive Current Control Module

[0154] As attached Figure 3 As shown, the adaptive current control module includes a fault type identification module, an adaptive parameter adjustment module, a dynamic control algorithm module, and a parameter feedback and optimization section. This module achieves adaptive adjustment of the converter current command through the following steps:

[0155] 1. Fault type identification

[0156] The fault type identification module analyzes fault signals to identify the type and severity of faults. Based on different fault types, such as short circuits, load surges, and voltage sags, the module can accurately determine the characteristics and impact range of the fault. In this way, the system can respond quickly and accurately to various fault conditions, ensuring the effectiveness of current control.

[0157] 2. Adaptive parameter adjustment

[0158] Based on the fault type and severity, the adaptive parameter adjustment module dynamically adjusts the parameters in the current command expression. Specific adjustment parameters include the no-load electromotive force before the short circuit. dq-axis component of short-circuit front-end voltage By dynamically adjusting these parameters, the system can better adapt to transient operating conditions under current fault conditions, improving the system's response speed and stability. This adjustment ensures that the converter can provide accurate and stable current output under fault conditions.

[0159] 3. Dynamic control algorithm module

[0160] The adaptive current control module employs a dynamic control algorithm that adjusts the current command in real time based on real-time monitoring data and fault types. These algorithms adjust control coefficients according to the actual operating conditions of the power grid, ensuring the stability and accuracy of the converter output current.

[0161] Specifically, to better adapt to different fault conditions, the parameters in the current command expression need to be dynamically adjusted according to the fault type and severity. Specific adjustment parameters include the no-load electromotive force before the short circuit. dq-axis component of short-circuit front-end voltage wait.

[0162] The adjustment process is as follows:

[0163] 1. Fault type identification:

[0164] The fault type identification module is used to identify the fault type (such as short circuit, load change, voltage sag, etc.) and severity based on the detected fault signals.

[0165] 2. Adaptive parameter adjustment:

[0166] Adjust the following parameters based on the identified fault type and severity:

[0167] No-load electromotive force before short circuit If the fault is severe, it may be necessary to reduce the electromotive force to reduce the current surge.

[0168] Short-circuit front-end voltage dq-axis component Adjust the dq axis voltage components according to the fault location and type to better control the current.

[0169] The specific adjusted current command expression is as follows:

[0170] Adjusted d-axis current command expression:

[0171]

[0172] Adjusted q-axis current command expression:

[0173]

[0174] The parameter adjustment instructions are as follows:

[0175] The no-load electromotive force before the short circuit is determined by the fault severity coefficient. The adjustment coefficient k1 is dynamically adjusted.

[0176] The q-axis component of the short-circuit front-end voltage is determined based on the fault type coefficient. The adjustment coefficient k2 is dynamically adjusted.

[0177] The d-axis component of the short-circuit front-end voltage is determined based on the fault location coefficient. The adjustment coefficient k3 is dynamically adjusted. Furthermore, the specific calculation process for adjusting the control coefficients, based on the fault type and severity, is as follows:

[0178] 1. Fault Severity Coefficient Calculation:

[0179] The system monitors voltage and current fluctuations in real time, and determines the severity of the fault by calculating the amplitude and frequency of these fluctuations. Assuming the fluctuation amplitude is... and The severity coefficient of the fault It can be represented as:

[0180]

[0181] in, The value range is [0, 1], where 0 represents no fault and 1 represents the most serious fault.

[0182] 2. Fault Type Coefficient and fault location coefficient Calculation:

[0183] Determine the fault type coefficient based on the fault type and the location of the fault. and fault location coefficient Fault types include short circuit, overload, and overtemperature, with different coefficients corresponding to different fault types. Assuming the short-circuit fault type =0.8, overload fault type =0.5, over-temperature fault type =0.3. Fault locations include the stator, rotor, etc., with different coefficients corresponding to different locations. Assuming the fault occurs on the low-voltage side of the transformer. =0.9, when the fault occurs on the high-voltage side of the transformer. =0.7.

[0184] 3. Calculation of adjustment coefficients k1, k2, and k3:

[0185] Based on the severity coefficient of the fault Fault type coefficient and fault location coefficient Then determine the specific values ​​of the adjustment factors k1, k2, and k3. The formula for calculating the adjustment factors is as follows:

[0186]

[0187] in, , and The initial adjustment coefficient is set based on actual empirical values, assuming... =0.9、 =0.8、 =0.7.

[0188] 4. Parameter Feedback and Optimization

[0189] The adaptive current control module monitors the converter's output current in real time and compares it with the expected current command. Through parameter feedback and optimization, the parameters of the adaptive control algorithm are continuously adjusted and optimized to improve system stability and response speed. The parameter feedback and optimization process includes steps such as real-time data acquisition, error calculation, and parameter adjustment. In this way, the system can maintain optimal operating conditions in dynamic environments.

[0190] Through the above implementation methods, the adaptive current control module can provide fast and accurate current control under various fault conditions, ensuring stable system operation. This design enhances the adaptability and response speed of the converter, and improves the overall reliability and stability of the power system.

[0191] Example 3 System Fault Handling Flow

[0192] When a system fault occurs, the fault detection module generates a fault signal, triggering the converter control module to switch to fault operation mode. The adaptive current control module dynamically adjusts the current command based on the fault type and severity. The system fault handling process is as follows: Figure 2 As shown, it includes the following steps:

[0193] 1. The grid connection point voltage detection device monitors the grid connection point voltage in real time:

[0194] High-precision sensors are used to continuously monitor the voltage at the grid connection point, ensuring the accuracy and timeliness of real-time data.

[0195] 2. The system fault detection module determines whether the voltage is lower than a set threshold:

[0196] The system fault detection module analyzes the collected voltage data and determines whether it is below the preset safety threshold.

[0197] 3. Generate a fault signal and switch to fault operation mode:

[0198] If the voltage is detected to be lower than the set threshold, the system fault detection module generates a fault signal.

[0199] The fault signal triggers the converter control module to switch to fault operation mode in preparation for handling the fault situation.

[0200] 4. The adaptive current control module adjusts the current command parameters:

[0201] The adaptive current control module dynamically adjusts the initial current command parameters according to the fault type (such as short circuit, overload, overtemperature) and severity.

[0202] Based on the severity coefficient of the fault Fault type coefficient and fault location coefficient Determine the specific values ​​of the adjustment coefficients k1, k2 and k3.

[0203] Then, the following parameters are adjusted:

[0204] The no-load electromotive force before the short circuit is determined by the fault severity coefficient. The adjustment coefficient k1 is dynamically adjusted.

[0205] The q-axis component of the short-circuit front-end voltage is determined based on the fault type coefficient. The adjustment coefficient k2 is dynamically adjusted.

[0206] The d-axis component of the short-circuit front-end voltage is determined based on the fault location coefficient. The adjustment coefficient k3 is dynamically adjusted.

[0207] 5. The converter outputs current according to the adjusted current command:

[0208] The converter outputs current based on the dynamically adjusted current command to support the grid connection point voltage and ensure stable operation of the system under fault conditions.

[0209] 6. After the fault is cleared, normal operation mode is restored:

[0210] Once the fault detection module confirms that the fault has been cleared, the converter control module will switch back to normal operation mode and restore the system to normal working condition.

[0211] Example 4

[0212] Furthermore, the present invention also provides a method for control using a converter control device, comprising:

[0213] The voltage at the grid connection point is monitored in real time by the grid connection point voltage detection device of the converter control device, and the voltage signal is transmitted to the system fault detection module of the converter control device.

[0214] The system fault detection module compares the voltage signal with a preset voltage threshold and generates a corresponding fault signal.

[0215] The converter control module of the converter control device adjusts the operating mode of the converter according to the fault signal.

[0216] When a system fault occurs, the adaptive current control module of the converter control device dynamically adjusts the initial current command of the converter according to the fault type and severity.

[0217] The converter control device described above is one of the converter control devices described in the above embodiments.

[0218] The initial current command is shown in formulas (1) and (2):

[0219] Formula (1):

[0220]

[0221] Formula (2):

[0222]

[0223] The meanings of the parameters in formulas (1) and (2) are as follows:

[0224] and These represent the reference currents for the d-axis and q-axis, respectively.

[0225] : The no-load electromotive force of the synchronous motor before short circuit;

[0226] dq-axis components of the short-circuit front-end voltage after Park transformation;

[0227] : The time constant of the excitation winding under stator short-circuit conditions;

[0228] The decay time constants of the DC component and the harmonic AC component;

[0229] Stator direct-axis and quadrature-axis operational reactances;

[0230] Direct-axis transient reactance;

[0231] t: time.

[0232] Attenuation factor in the formula and This is achieved by an attenuation stage, which includes:

[0233] The system fault detection section is used to generate trigger signals;

[0234] A step signal generator is used to generate a unit step signal.

[0235] A first-order inertial element is used to generate a first-order inertial response;

[0236] The addition and subtraction section is used to subtract the number 1 from the first-order inertial response to obtain the final attenuation factor;

[0237] As shown in formula (1), the d-axis current command has two attenuation factors, which need to be generated by two attenuation stages respectively; the time constant of the first-order inertial stage contained in one of the attenuation stages is... The time constant of the first-order inertial element contained in the other decay stage is... As shown in formula (2), the q-axis current command contains only one attenuation factor and requires only one attenuation stage; the time constant of the first-order inertial stage in the attenuation stage is... .

[0238] The adaptive current control module of the converter control device dynamically adjusts the initial current command of the converter according to the fault type and severity when a system fault occurs, including:

[0239] The fault type and severity are identified through the fault type identification module of the adaptive current control module;

[0240] The adaptive parameter adjustment module of the adaptive current control module dynamically adjusts the parameters in the current command expression according to the fault type and severity.

[0241] The adaptive current control module dynamically adjusts the current command based on real-time monitored data through its dynamic control algorithm module.

[0242] The adaptive current control module monitors the output current in real time and optimizes the parameters through parameter feedback and optimization.

[0243] The specific current command adjusted according to the adaptive current control module is as follows:

[0244] Adjusted d-axis current command expression:

[0245]

[0246] Adjusted q-axis current command expression:

[0247]

[0248] in:

[0249] The no-load electromotive force before the short circuit is determined by the fault severity coefficient. The adjustment coefficient k1 is dynamically adjusted.

[0250] The q-axis component of the short-circuit front-end voltage is determined based on the fault type coefficient. The adjustment coefficient k2 is dynamically adjusted.

[0251] The d-axis component of the short-circuit front-end voltage is determined based on the fault location coefficient. The adjustment coefficient k3 is dynamically adjusted.

[0252] The process of comparing the voltage signal with a preset voltage threshold through the system fault detection module to generate a corresponding fault signal includes:

[0253] When the voltage signal is higher than the set threshold, the system fault detection module determines that the system is fault-free; when the voltage signal is lower than the set threshold, the system fault detection module determines that the system has a fault.

[0254] Example 5

[0255] like Figure 4 As shown, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0256] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), 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, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method of using a converter control device for control in the above embodiments.

[0257] Example 6

[0258] Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of a method for control using a converter control device as described in the above embodiments.

[0259] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0260] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0261] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0262] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0263] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A converter control device, the control device comprising: A grid connection point voltage detection device, used to monitor the voltage of the grid connection point in real time and transmit the voltage signal to the system fault detection module; A system fault detection module, used to compare the voltage signal with a preset voltage threshold and generate a corresponding fault signal; a converter control module, used to adjust the operation mode of the converter according to the fault signal; characterized in that: the control device also includes an adaptive current control module, used to dynamically adjust the initial current instruction of the converter according to the type and severity of the fault when a system fault occurs; In the system fault operation mode, the initial current command of the converter is shown in formula (1) and formula (2): Formula (1): Formula (2): The meanings of the parameters in formula (1) and formula (2) are as follows: and Represent the reference current of d-axis and q-axis respectively; : No-load electromotive force of synchronous motor before short circuit; , : dq axis components of the short-circuit front-end voltage after Park transformation; : Time constant of the field winding under stator short circuit; : The decay time constant of the DC component and the double frequency AC component; , : stator direct-axis and quadrature-axis operational reactance; : Direct-axis transient reactance; :time; The attenuation factor in the formula and The attenuation link is implemented, and the attenuation link includes: A system fault detection section, used to generate a trigger signal; A step signal generator, used for generating a unit step signal; A first-order inertia link, used to generate a first-order inertial response; The addition and subtraction operation part is used to subtract the number 1 from the first-order inertial response to obtain the final attenuation factor; As shown in formula (1), there are two attenuation factors in the d-axis current command, which need to be generated by two attenuation links respectively; the time constant of the first-order inertia link included in one of the attenuation links is ; The time constant of the first-order inertia link included in the other decay link is As shown in formula (2), the q-axis current command only contains one attenuation factor and only requires one attenuation link; the time constant of the first-order inertia link in the attenuation link is ; The adaptive current control module comprises: A fault type identification module is used to identify the fault type and severity; An adaptive parameter adjustment module is used to dynamically adjust the parameters in the current command expression according to the fault type and severity; Dynamic control algorithm module, used to dynamically adjust current instructions according to real-time monitoring data; Parameter feedback and optimization part, used to monitor output current in real time and perform parameter optimization; The current command adjusted by the adaptive current control module is as follows: The adjusted d-axis current command expression is: The adjusted q-axis current command expression is: in: : No-load electromotive force before short circuit according to the fault severity coefficient and adjustment factor Dynamic adjustment; : The q-axis component of the short-circuit front-end voltage is calculated based on the fault type coefficient and adjustment factor Dynamic adjustment; :The d-axis component of the short-circuit front-end voltage is based on the fault location coefficient and adjustment factor Dynamic adjustment; The adjustment factor is based on the fault severity factor , Fault type coefficient and the fault location factor , determine the adjustment factor , and The specific value of; the calculation formula of the adjustment coefficient is as follows: in, , and is the initial adjustment factor.

2. A converter control device according to claim 1, characterized in that: The system fault detection module generates a corresponding fault signal further including that when the voltage signal is higher than a set threshold, the system fault detection module determines that the system has no fault; when the voltage signal is lower than the set threshold, the system fault detection module determines that the system has a fault.

3. A converter control device according to claim 1, characterized in that: The fault types include short circuit, overload or over temperature.

4. A method for controlling using a converter control device, characterized in that: include: The grid connection point voltage detection device of the converter control device monitors the grid connection point voltage in real time and transmits the voltage signal to the system fault detection module of the converter control device; The system fault detection module compares the voltage signal with a preset voltage threshold and generates a corresponding fault signal; adjusting the operation mode of the converter according to the fault signal through a converter control module of the converter control device; When a fault occurs in the system, the adaptive current control module of the converter control device dynamically adjusts the initial current command of the converter according to the type and severity of the fault; Wherein, the converter control device is a converter control device as claimed in any one of claims 1 to 3; The initial current command is shown in formula (1) and formula (2): Formula (1): Formula (2): The meanings of the parameters in formula (1) and formula (2) are as follows: and Represent the reference current of d-axis and q-axis respectively; : No-load electromotive force of synchronous motor before short circuit; , : dq axis components of the short-circuit front-end voltage after Park transformation; : Time constant of the field winding under stator short circuit; : The decay time constant of the DC component and the double frequency AC component; , : stator direct-axis and quadrature-axis operational reactance; : Direct-axis transient reactance; :time; The attenuation factor in the formula and The attenuation link is implemented, and the attenuation link includes: A system fault detection section, used to generate a trigger signal; A step signal generator, used for generating a unit step signal; A first-order inertia link, used to generate a first-order inertial response; The addition and subtraction operation part is used to subtract the number 1 from the first-order inertial response to obtain the final attenuation factor; As shown in formula (1), there are two attenuation factors in the d-axis current command, which need to be generated by two attenuation links respectively; the time constant of the first-order inertia link included in one of the attenuation links is ; The time constant of the first-order inertia link included in the other decay link is As shown in formula (2), the q-axis current command only contains one attenuation factor and only requires one attenuation link; the time constant of the first-order inertia link in the attenuation link is ; The adaptive current control module of the converter control device dynamically adjusts the initial current instruction of the converter according to the type and severity of the fault when a fault occurs in the system, including: Identify the fault type and severity by a fault type identification module of the adaptive current control module; Dynamically adjust the parameters in the current command expression according to the fault type and severity through the adaptive parameter adjustment module of the adaptive current control module; Dynamically adjust the current command according to the real-time monitoring data through the dynamic control algorithm module of the adaptive current control module; The parameter feedback and optimization part of the adaptive current control module monitors the output current in real time and performs parameter optimization; The current command adjusted by the adaptive current control module is as follows: The adjusted d-axis current command expression is: The adjusted q-axis current command expression is: ； in: : No-load electromotive force before short circuit according to the fault severity coefficient and adjustment factor Dynamic adjustment; : The q-axis component of the short-circuit front-end voltage is calculated based on the fault type coefficient and adjustment factor Dynamic adjustment; :The d-axis component of the short-circuit front-end voltage is based on the fault location coefficient and adjustment factor Dynamic adjustment; The adjustment factor is based on the fault severity factor , Fault type coefficient and the fault location factor , determine the adjustment factor , and The specific value of; the calculation formula of the adjustment coefficient is as follows: in, , and is the initial adjustment factor.

5. The method according to claim 4, characterized in that The system fault detection module compares the voltage signal with a preset voltage threshold to generate a corresponding fault signal, including: When the voltage signal is higher than the set threshold, the system fault detection module determines that the system has no fault; when the voltage signal is lower than the set threshold, the system fault detection module determines that the system has a fault.

6. 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 method for controlling by using a converter control device as claimed in any one of claims 4 to 5 is implemented.

7. A readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, a method for controlling by using a converter control device as claimed in any one of claims 4 to 5 is implemented.

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