Three-phase rectifier intermittent control method and system for improving light load performance

Abstract

The invention discloses a three-phase rectifier intermittent control method and system for improving light load performance, and belongs to the technical field of three-phase rectifier control. Comprising the steps of obtaining a real-time voltage value and a voltage reference value of a direct current side of a three-phase rectifier, and processing the real-time voltage value and the voltage reference value through a voltage loop controller to obtain a q-axis current reference value; introducing a limiter and a power grid voltage threshold value, and combining the q-axis voltage reference value to obtain a criterion voltage; if the criterion voltage is smaller than the absolute value of the power grid voltage, setting the duty ratio as 0 and outputting; if the criterion voltage is not smaller than the absolute value of the power grid voltage, outputting the duty ratio. The light load performance and the stability of the VIENNA rectifier can be effectively improved, and the problems of light load performance optimization of the three-phase rectifier and unsmooth transition between the light load and a normal membrane type are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of three-phase rectifier control, and in particular to a three-phase rectifier intermittent control method and system for improving light-load performance. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] VIENNA rectifier is a unidirectional energy transmission converter. Generally, the back end is connected to a DC load through a DC / DC converter or directly. When the load is light enough (working under light load conditions), the energy on the DC side has nowhere to be transmitted, which can easily lead to overvoltage or uncontrollable DC side. For example, the DC side voltage may fluctuate greatly or continue to increase until the overvoltage protection is triggered, which will pose a potential threat to the safe operation of the system.

[0004] For three-phase VIENNA rectifier applications, stability under light load conditions becomes increasingly important because they are in low-power standby mode for a long time, especially at night when user traffic is minimal. Especially for electric vehicle chargers, constant voltage (CV) charging function needs to be implemented, and voltage fluctuations will lead to reduced system performance and reliability.

[0005] For control systems based on the dq rotating coordinate system, it is difficult to control the DC side voltage at light load. The main reasons are as follows:

[0006] 1) Different dynamic characteristics. Under light load, the system has less inertia and is more sensitive to disturbances. The voltage feedback loop may fluctuate greatly. However, the accuracy and sensitivity of the controller are not enough to provide fast dynamic response.

[0007] 2) Feedback delay: The voltage loop may make frequent adjustments when the load is light, while the response time and feedback link of the current loop have certain delays.

[0008] 3) Parameter setting. The optimal parameters of the PI controller under light load and normal conditions are different. Under light load, the proportional and integral parameters of the PI controller should be reduced to avoid voltage oscillation caused by overshoot and excessive response.

[0009] 4) The rectifier enters discontinuous conduction mode (DCM), the inductor current is out of control, and the control difficulty increases.

[0010] At present, the traditional method improves the stability of the three-phase VIENNA rectifier under light load conditions through burst mode (also known as hysteresis control). This method uses hysteresis control to determine whether to trigger the driver, thereby limiting the output voltage within the hysteresis range. However, whether the hysteresis control is performed on the DC voltage or the voltage loop output, the DC voltage contains obvious ripples. Burst mode control can reduce the circulation loss and improve efficiency to a certain extent, but it can only guarantee a limited DC side output voltage stability capability, and the dynamic response during the conversion process needs to be improved.

[0011] There are few studies on methods to improve the light-load performance of three-phase VIENNA rectifiers. In order to optimize the light-load performance, the operating parameters of the PI controller can be dynamically adjusted according to the load conditions of the system, but the parameter setting is relatively complicated. Another idea is to use different control strategies in light-load and normal modes. However, both of these ideas involve light-load state judgment. The judgment criteria are somewhat subjective and are often not universal for different systems, making it a difficult problem to determine the judgment criteria. State judgment generally relies on DC side current sensors, which increases cost and volume. In addition, due to different modulation strategies and parameters, the transition between light-load and normal modes is not smooth. Summary of the invention

[0012] In order to address the deficiencies in the prior art, the present invention provides a three-phase rectifier intermittent control method, system, electronic device, computer-readable storage medium and computer program product for improving light-load performance, which can control the three-phase rectifier DC voltage to remain stable in steady state and dynamic state, effectively improve light-load performance, and ensure a smooth transition between light-load and normal modes.

[0013] In a first aspect, the present invention provides a three-phase rectifier intermittent control method for improving light load performance;

[0014] A three-phase rectifier intermittent control method for improving light load performance, comprising:

[0015] Acquire a real-time voltage value and a voltage reference value on the DC side of the three-phase rectifier, process the real-time voltage value and the voltage reference value through a voltage loop controller, and acquire a q-axis current reference value;

[0016] A limiter and a grid voltage threshold are introduced, and the criterion voltage is obtained in combination with the q-axis voltage reference value; if the criterion voltage is less than the absolute value of the grid voltage, the duty cycle is set to 0 and output; if the criterion voltage is not less than the absolute value of the grid voltage, the duty cycle is output.

[0017] In some implementations, the introduction of the limiter and the grid voltage threshold, combined with the q-axis voltage reference value, to obtain the criterion voltage is specifically:

[0018] If the q-axis current reference value is greater than 0, the current upper limit value of the limiter is obtained, and a criterion voltage is generated according to the current upper limit value of the limiter and the q-axis current reference value;

[0019] If the q-axis current reference value is not greater than 0, a criterion voltage is generated according to the grid voltage threshold.

[0020] In some implementations, the criterion voltage is expressed as:

[0021]

[0022] In the formula, p represents the proportionality coefficient, i LM Indicates the current upper limit of the limiter, i q_ref Indicates the q-axis current reference value, u M Indicates the grid voltage threshold.

[0023] In some implementations, the duty cycle is expressed as:

[0024]

[0025] In the formula, u cri Indicates the criterion voltage, u x Indicates the grid voltage.

[0026] In some implementations, the q-axis current reference value is expressed as:

[0027]

[0028] In the formula, u dc Indicates the real-time voltage value, u dc_ref Indicates the voltage reference value, k pv represents the proportional parameter of the voltage loop controller, k iv represents the integral parameter of the voltage loop controller, and s represents the variable in the complex frequency domain.

[0029] In some embodiments, it further comprises:

[0030] If the q-axis current reference value is not greater than 0, the q-axis current loop reference value and the q-axis current value are processed by the PI controller to obtain the q-axis voltage reference value;

[0031] The d-axis current value is processed by a PI controller to obtain a d-axis voltage reference value;

[0032] The q-axis voltage reference value and the d-axis voltage reference value are subjected to dq / abc conversion to generate a modulation signal.

[0033] In a second aspect, the present invention provides a three-phase rectifier intermittent control system for improving light-load performance;

[0034] A three-phase rectifier intermittent control system for improving light load performance, comprising:

[0035] A first acquisition module is configured to: acquire a real-time voltage value and a voltage reference value of a DC side of a three-phase rectifier, and process the real-time voltage value and the voltage reference value through a voltage loop controller to acquire a q-axis current reference value;

[0036] The second acquisition module is configured to: introduce a limiter and a grid voltage threshold, and acquire a criterion voltage in combination with the q-axis voltage reference value;

[0037] The intermittent control module is configured as follows: if the criterion voltage is less than the absolute value of the grid voltage, the duty cycle is set to 0 and output; if the criterion voltage is not less than the absolute value of the grid voltage, the duty cycle is output.

[0038] In a third aspect, the present invention provides an electronic device;

[0039] An electronic device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above-mentioned three-phase rectifier intermittent control method for improving light-load performance.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium;

[0041] A computer-readable storage medium stores a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned three-phase rectifier intermittent control method for improving light-load performance.

[0042] In a fifth aspect, the present invention provides a computer program product;

[0043] A computer program product includes a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned three-phase rectifier intermittent control method for improving light-load performance.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The technical solution provided by the present invention can reduce the switch on-time by inserting a zero-level signal at intervals in the duty cycle, thereby reducing the transmitted power and maintaining the power balance of the rectifier; the duty cycle can still maintain the sinusoidal wave variation characteristics, will not cause grid current distortion, and can control the DC voltage to remain stable in both steady state and dynamic state, which can effectively improve the light load performance and ensure a smooth transition between light load and normal mode.

[0046] 2. The technical solution provided by the present invention designs a criterion voltage for comparing with the absolute value of the grid voltage to insert the zero level, and constructs a functional relationship between the criterion voltage and the current reference value, so as to dynamically adjust the zero level duration according to the operating status of the three-phase rectifier.

[0047] 3. The technical solution provided by the present invention introduces a limiter to prevent integral saturation and output fluctuation of the PI controller, taking into account the characteristics that the feedback signal of the current loop is small and the voltage loop is prone to over-reaction in light-load mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0049] Figure 1 A control block diagram of a three-phase rectifier intermittent control method for improving light-load performance provided by an embodiment of the present invention;

[0050] Figure 2 A schematic flow chart of a three-phase rectifier intermittent control method for improving light-load performance provided by an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of dynamic cause-effect relationship of three-phase rectifier control under light load provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of a typical control strategy of a three-phase VIENNA rectifier in a synchronous rotating coordinate system provided by an embodiment of the present invention;

[0053] Figure 5 Schematic diagram of the principle of reducing the switch on time of a three-phase rectifier provided by an embodiment of the present invention, wherein (a) is a schematic diagram of the principle of reducing the switch on time by increasing the modulation index, and (b) is a schematic diagram of the principle of reducing the switch on time by inserting a zero level;

[0054] Figure 6 Schematic diagram of waveforms of various signals under light load provided by an embodiment of the present invention; wherein (a) is i a Schematic diagram of the working waveform, (b) is i q_ref and i Lq_ref Schematic diagram of the working waveform, (c) is u dc and u cri Schematic diagram of the working waveform, (d) is d a Schematic diagram of working waveform;

[0055] Figure 7The following are example diagrams of experimental waveforms under a 1.2kW light load provided by an embodiment of the present invention without using the control method described in this embodiment, wherein (a) is a dynamic experimental waveform diagram, and (b) is a steady-state experimental waveform diagram;

[0056] Figure 8 The following are example diagrams of dynamic and steady-state experimental waveforms of the control method of the present embodiment under a light load of 1.2 kW provided in the embodiment of the present invention, wherein (a) is a dynamic experimental waveform diagram, and (b) is a steady-state experimental waveform diagram;

[0057] Fig. 9 The following are example diagrams of dynamic and steady-state experimental waveforms of the control method of the present embodiment under a light load of 100W provided in the embodiment of the present invention, wherein (a) is a dynamic experimental waveform diagram, and (b) is a steady-state experimental waveform diagram;

[0058] Fig.10 The following are example diagrams of experimental waveforms using the prior art under a 720W light load provided in an embodiment of the present invention, wherein (a) is an example diagram of an experimental waveform in which the on-time is reduced by increasing the modulation index, and (b) is an example diagram of an experimental waveform in which the on-time is reduced by inserting a zero level. DETAILED DESCRIPTION

[0059] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0060] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0062] Terminology explanation:

[0063] Three-phase VIENNA rectifier: The three-phase VIENNA rectifier is a highly efficient power factor correction (PFC) rectifier structure. As a three-level converter, it is widely used in multiple industrial fields, including electric vehicle chargers, renewable energy systems, wind turbines, power conversion and other efficient energy management scenarios due to its advantages such as high efficiency, high power density, high reliability and high cost performance.

[0064] Embodiment 1

[0065] In the prior art, the switch on-time is reduced by PWM control or intermittent control. PWM control reduces the switch on-time by reducing the average value of the duty cycle, but it will cause grid current distortion. Therefore, the present invention provides a three-phase rectifier intermittent control method for improving light load performance. According to the actual operating state of the three-phase VIENNA rectifier, a zero-level signal is intermittently inserted in the duty cycle to reduce the switch on-time.

[0066] Next, combine Figure 1-Figure 10 , a three-phase rectifier intermittent control method for improving light-load performance disclosed in this embodiment is described in detail. In this embodiment, the three-phase rectifier is a three-phase VIENNA rectifier, and the three-phase rectifier intermittent control method for improving light-load performance includes the following steps:

[0067] S1, obtain the real-time voltage value and voltage reference value of the DC side of the three-phase VIENNA rectifier, and use the voltage loop controller to control the real-time voltage value u dc and voltage reference value u dc_ref Processing is performed to obtain the q-axis current reference value i q_ref .

[0068] In this embodiment, the q-axis current reference value is expressed as:

[0069]

[0070] In the formula, u dc Indicates the real-time voltage value, u dc_ref Indicates the voltage reference value, k pv represents the proportional parameter of the voltage loop controller, k iv represents the integral parameter of the voltage loop controller, and s represents the variable in the complex frequency domain.

[0071] In the transfer function of a PI controller, the symbol s usually represents a complex variable in the complex frequency domain, called the Laplace variable or complex frequency. This is a variable used in the Laplace Transform to convert a differential equation in the time domain into an algebraic equation in the frequency domain.

[0072] S2. Introduce a limiter and a grid voltage threshold, and combine the q-axis voltage reference value to obtain the criterion voltage; if the criterion voltage is less than the absolute value of the grid voltage, set the duty cycle to 0 and output it, which is equivalent to inserting a zero level into the duty cycle; if the criterion voltage is not less than the absolute value of the grid voltage, output the duty cycle for intermittent control.

[0073] Under light load conditions, the load power demand is greatly reduced, but the power conversion process continues, and the energy stored on the DC side cannot be consumed in time, which will eventually lead to u dc At this time, for the voltage loop, u dc will exceed u dc_ref , resulting in serious power imbalance; after calculation by the PI controller, i q_ref A positive value will appear.

[0074] The parameters of the PI controller are usually optimized according to the heavy load conditions of the system. Under normal conditions, the current loop can respond quickly and accurately to load changes to ensure u dc However, when the load is light, the feedback signal of the current loop is small and its regulation ability is greatly weakened. The current loop is difficult to provide accurate response, and the integral of the voltage loop PI controller is prone to over-reaction, making i q_ref Therefore, a limiter needs to be introduced to prevent integral saturation and output fluctuations. The upper limit of the limiter is i LM .

[0075] Therefore, in this embodiment, the criterion voltage is calculated by combining the value of the q-axis voltage reference value, the limiter and the grid voltage threshold.

[0076] Specifically, the criterion voltage is expressed as:

[0077]

[0078] In the formula, p represents the proportionality coefficient, i LM Indicates the current upper limit of the limiter, i q_ref Indicates the q-axis current reference value, u M Represents the grid voltage threshold, i.e. a constant value greater than the grid voltage peak;

[0079] The duty cycle is expressed as:

[0080]

[0081] In the formula, u cri Indicates the criterion voltage, u x Indicates the grid voltage.

[0082] when i q_ref >0, i q_ref with u criThere is a negative correlation between q_ref The larger the u cri It should be smaller to increase the zero-level duration and set the current loop reference value i Lq_ref Forced to 0. q_ref When ≤0, i Lq_ref =i q_ref , the system can be considered to be in normal mode, u cri is set to a constant value u greater than the grid voltage amplitude M , thus ensuring the normal output of duty cycle.

[0083] The intermittent control proposed in this embodiment means that a zero-level signal is inserted at intervals in the duty cycle, so that the duty cycle can still maintain the sinusoidal variation characteristics and the grid current will not be distorted. In addition, due to the introduction of the zero level, the average value of the duty cycle can also be effectively reduced, thereby reducing the switch on time.

[0084] Combination Figure 5 , intermittent control according to the duty cycle is specifically: compare the duty cycle with the triangular carrier signal to output a PWM wave, that is, a switching signal. If the duty cycle is greater than the carrier signal, the PWM output is a high level, otherwise it outputs a low level.

[0085] Furthermore, if the q-axis voltage reference value is not greater than 0, the method further includes:

[0086] The q-axis current loop reference value and the q-axis current value are processed by the PI controller to obtain the q-axis voltage reference value; the d-axis current value is processed by the PI controller to obtain the d-axis voltage reference value; the q-axis voltage reference value and the d-axis voltage reference value are transformed by dq / abc to obtain u a_ref 、u b_ref and u c_ref Generate a modulated signal.

[0087] Exemplarily, the PI controller is expressed as:

[0088]

[0089] In the formula, u(t) represents the control quantity generated by the control system, K P represents the control gain, e(t) represents the control error, T I represents the integration time constant, and t represents the integration interval.

[0090] At the same time, when i q_ref >0, the switch position is 1, current control is also performed, but the q-axis reference value is set to 0, i Lq_ref =0.

[0091] Next, in order to verify the advancement and feasibility of the method described in this embodiment, a 30kW three-phase VIENNA rectifier prototype was designed and manufactured.

[0092] Figure 7 The dynamic and steady-state experimental waveforms are shown under a light load of 1.2 kW without using the control method described in this embodiment. dc The ripple is about 50V, and the AC input current also fluctuates, which will reduce system performance and reliability.

[0093] Figure 8 The dynamic and steady-state experimental waveforms of the proposed strategy under 1.2kW light load are shown. dc The ripple is about 12V, and the ripple rate is about 2%. Compared with the conventional method, the ripple content is extremely low and the current fluctuation is small.

[0094] Fig. 9 The dynamic and steady-state experimental waveforms of the proposed strategy under 100W light load are shown. dc There is no fluctuation and the ripple rate is almost 0%. When the load switches between normal and light load states, the proposed strategy u dc There is no significant overshoot in the current, which indicates good dynamic response characteristics during transients.

[0095] Fig.10 The experimental waveforms of reducing the on-time by increasing the modulation index and reducing the on-time by inserting zero level are compared under 720W light load. Although both methods can maintain u dc The proposed method does not produce excessive spikes and severe distortion in the grid current, and can still maintain the sinusoidal characteristics. When the modulation index is increased, the grid current spike exceeds 20A.

[0096] Embodiment 2

[0097] This embodiment discloses a three-phase rectifier intermittent control system for improving light-load performance, including:

[0098] A first acquisition module is configured to: acquire a real-time voltage value and a voltage reference value of a DC side of a three-phase rectifier, and process the real-time voltage value and the voltage reference value through a voltage loop controller to acquire a q-axis current reference value;

[0099] The second acquisition module is configured to: introduce a limiter and a grid voltage threshold, and acquire a criterion voltage in combination with the q-axis voltage reference value;

[0100] The intermittent control module is configured as follows: if the criterion voltage is less than the absolute value of the grid voltage, the duty cycle is set to 0 and output; if the criterion voltage is not less than the absolute value of the grid voltage, the duty cycle is output.

[0101] It should be noted that the first acquisition module, the second acquisition module and the intermittent control module correspond to the steps in Embodiment 1, and the examples and application scenarios implemented by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in Embodiment 1. It should be noted that the modules as part of the system can be executed in a computer system such as a set of computer executable instructions.

[0102] Embodiment 3

[0103] Embodiment 3 of the present invention provides an electronic device, including a memory and a processor, and computer instructions stored in the memory and executed on the processor. When the computer instructions are executed by the processor, the steps of the above-mentioned three-phase rectifier intermittent control method for improving light load performance are completed.

[0104] Embodiment 4

[0105] Embodiment 4 of the present invention provides a computer-readable storage medium for storing computer instructions. When the computer instructions are executed by a processor, the steps of the above-mentioned three-phase rectifier intermittent control method for improving light-load performance are completed.

[0106] Embodiment 5

[0107] Embodiment 5 of the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned three-phase rectifier intermittent control method for improving light-load performance.

[0108] 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.

[0109] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0110] These computer program instructions can also be loaded onto a computer or other programmable data processing device, and a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0111] The description of each embodiment in the above embodiments has different emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-phase rectifier intermittent control method for improving light load performance, characterized in that: include: Acquire a real-time voltage value and a voltage reference value on the DC side of the three-phase rectifier, process the real-time voltage value and the voltage reference value through a voltage loop controller, and acquire a q-axis current reference value; A limiter and a grid voltage threshold are introduced, and the criterion voltage is obtained in combination with the q-axis voltage reference value; if the criterion voltage is less than the absolute value of the grid voltage, the duty cycle is set to 0 and output; If the criterion voltage is not less than the absolute value of the grid voltage, the duty cycle is output.

2. The three-phase rectifier intermittent control method for improving light load performance according to claim 1, characterized in that: The introduction of the limiter and the grid voltage threshold, combined with the q-axis voltage reference value, to obtain the criterion voltage is specifically: If the q-axis current reference value is greater than 0, the current upper limit value of the limiter is obtained, and a criterion voltage is generated according to the current upper limit value of the limiter and the q-axis current reference value; If the q-axis current reference value is not greater than 0, a criterion voltage is generated according to the grid voltage threshold.

3. The three-phase rectifier intermittent control method for improving light load performance according to claim 1, characterized in that: The criterion voltage is expressed as: In the formula, p represents the proportionality coefficient, i LM Indicates the current upper limit of the limiter, i q_ref Indicates the q-axis current reference value, u M Indicates the grid voltage threshold.

4. The three-phase rectifier intermittent control method for improving light load performance according to claim 1, characterized in that: The duty cycle is expressed as: In the formula, u cri Indicates the criterion voltage, u x Indicates the grid voltage.

5. The three-phase rectifier intermittent control method for improving light load performance according to claim 1, characterized in that: The q-axis current reference value is expressed as: In the formula, u dc Indicates the real-time voltage value, u dc_ref Indicates the voltage reference value, k pv represents the proportional parameter of the voltage loop controller, k iv represents the integral parameter of the voltage loop controller, and s represents the variable in the complex frequency domain.

6. The three-phase rectifier intermittent control method for improving light-load performance according to claim 1, characterized in that: Also includes: If the q-axis current reference value is not greater than 0, the q-axis current loop reference value and the q-axis current value are processed by the PI controller to obtain the q-axis voltage reference value; The d-axis current value is processed by a PI controller to obtain a d-axis voltage reference value; The q-axis voltage reference value and the d-axis voltage reference value are subjected to dq / abc conversion to generate a modulation signal.

7. A three-phase rectifier intermittent control system for improving light load performance, characterized in that: include: A first acquisition module is configured to: acquire a real-time voltage value and a voltage reference value of a DC side of a three-phase rectifier, and process the real-time voltage value and the voltage reference value through a voltage loop controller to acquire a q-axis current reference value; The second acquisition module is configured to: introduce a limiter and a grid voltage threshold, and acquire a criterion voltage in combination with the q-axis voltage reference value; The intermittent control module is configured to: if the criterion voltage is less than the absolute value of the grid voltage, set the duty cycle to 0 and output; If the criterion voltage is not less than the absolute value of the grid voltage, the duty cycle is output.

8. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the three-phase rectifier intermittent control method for improving light-load performance as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the steps of the intermittent control method of a three-phase rectifier for improving light-load performance as described in any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the intermittent control method of a three-phase rectifier for improving light-load performance as described in any one of claims 1 to 6 are implemented.

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