CN115347602B - A method and system for suppressing starting inrush current of a three-phase grid-connected converter - Google Patents
A method and system for suppressing starting inrush current of a three-phase grid-connected converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
本公开属于电力电子技术领域，具体涉及一种三相并网变换器启动冲击电流抑制方法及系统，包括：基于三相并网变换器中的三相交流继电器开关控制交流继电器的通断；在三相并网变换器控制电路中增设用于控制PWM波生成器通断的PWM波生成器开关和用于控制闭环控制器状态的闭环控制器开关；对逆变器侧电流和电网公共连接点处三相电压进行坐标变换，分别得到电流跟踪指令值和电压前馈指令值；结合比例积分控制器、电流跟踪指令值和电压前馈指令值，依次调节所述闭环控制器开关、所述PWM波生成器开关和所述三相交流继电器开关的状态，抑制三相并网变换器启动过程中的冲击电流。
The present invention belongs to the technical field of power electronics, and specifically relates to a method and system for suppressing starting impact current of a three-phase grid-connected converter, comprising: controlling the on-off of an AC relay based on a three-phase AC relay switch in the three-phase grid-connected converter; adding a PWM wave generator switch for controlling the on-off of a PWM wave generator and a closed-loop controller switch for controlling the state of a closed-loop controller in a control circuit of the three-phase grid-connected converter; performing coordinate transformation on an inverter side current and a three-phase voltage at a common connection point of a power grid to obtain a current tracking command value and a voltage feedforward command value respectively; combining a proportional-integral controller, a current tracking command value and a voltage feedforward command value, sequentially adjusting the states of the closed-loop controller switch, the PWM wave generator switch and the three-phase AC relay switch to suppress the impact current during the starting process of the three-phase grid-connected converter.
Description
Technical Field
The disclosure belongs to the technical field of power electronics, and particularly relates to a method and a system for suppressing starting impact current of a three-phase grid-connected converter.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The application of wind, light and other new energy grid-connected power generation, energy storage and the like requires the three-phase grid-connected converter to be connected with a power grid to complete the energy conversion from alternating current to direct current or from direct current to alternating current. The impulse current exists on the alternating current side in the starting process of the three-phase grid-connected converter, and the impulse current needs to be restrained by means of hardware or software.
The inventor knows that the existing impulse current hardware suppression method generally utilizes an additional current limiting resistor, and closes an alternating current relay before the grid-connected converter is started, and the impulse current is suppressed through the current limiting resistor. After the AC capacitor (or DC side capacitor) is charged, the bypass current-limiting resistor is additionally arranged to avoid the power loss. However, the current limiting resistor and the bypass relay inevitably increase the volume, cost and weight of the grid-connected converter system, increase the complexity of the system and reduce the reliability of the circuit. The impact current can be limited by accurately detecting the zero crossing point of the alternating voltage and independently closing the three-phase alternating current relays near the zero crossing point, however, the three-phase alternating current relays of the actual grid-connected converter are often controlled by adopting a unified signal, and the independent control is difficult to realize.
Aiming at the three-phase grid-connected converter without the current limiting resistor, the starting process is extremely easy to overcurrent, and a severe challenge is formed for the normal operation of an alternating current relay and a power switch, so that grid-connected failure and converter failure are caused, and the reliability and safety of the system are reduced.
Disclosure of Invention
In order to solve the problems, the present disclosure provides a method and a system for suppressing the starting impact current of a three-phase grid-connected converter, which do not need to add hardware such as a current limiting resistor and a bypass relay, can obviously reduce the starting impact current of the grid-connected converter, avoid the additional system cost, volume and weight introduced by the current limiting resistor and the bypass relay, simplify the system structure, increase the reliability and robustness of the system, and have the advantage of simple realization.
According to some embodiments, a first scheme of the present disclosure provides a method for suppressing starting inrush current of a three-phase grid-connected converter, which adopts the following technical scheme:
a method for suppressing starting impact current of a three-phase grid-connected converter comprises the following steps:
controlling the on-off of an alternating current relay based on a three-phase alternating current relay switch in the three-phase grid-connected converter;
A PWM wave generator switch for controlling the on-off of the PWM wave generator and a closed-loop controller switch for controlling the state of the closed-loop controller are additionally arranged in a three-phase grid-connected converter control circuit;
Coordinate transformation is carried out on the current at the side of the inverter and the three-phase voltage at the public connection point of the power grid, and a current tracking command value and a voltage feedforward command value are respectively obtained;
And sequentially adjusting states of the closed loop controller switch, the PWM wave generator switch and the three-phase alternating current relay switch by combining a proportional integral controller, a current tracking command value and a voltage feedforward command value, and inhibiting impulse current in the starting process of the three-phase grid-connected converter.
The three-phase grid-connected converter comprises a power semiconductor switch, a three-phase LCL filter and a three-phase alternating current relay which are sequentially connected, wherein the power semiconductor switch adopts a three-phase bridge type power semiconductor switch and comprises a first bridge arm, a second bridge arm and a third bridge arm, the first bridge arm comprises a first power switch device and a fourth power switch device, the second bridge arm comprises a third power switch device and a sixth power switch device, and the third bridge arm comprises a second power switch device and a fifth power switch device.
Further, the first power switch device, the second power switch device, the third power switch device, the fourth power switch device, the fifth power switch device and the sixth power switch device are all switch tube units, each switch tube unit comprises a triode and a diode which is reversely connected between the collector electrode and the emitter electrode of the triode in parallel, the anode of the diode is connected with the emitter electrode of the triode, and the cathode of the diode is connected with the collector electrode of the triode.
Further, the three-phase LCL filter comprises a three-phase inversion side inductor, a three-phase network side inductor and a three-phase filter capacitor, wherein one side of the three-phase inversion side inductor is respectively arranged in the middle of the first bridge arm, the second bridge arm and the third bridge arm, the other side of the three-phase inversion side inductor is respectively connected with the three-phase network side inductor, and one end of the three-phase filter capacitor is respectively connected with the three-phase inversion side inductor and the three-phase network side inductor, and the other end of the three-phase filter capacitor is respectively short-circuited.
As a further technical definition, the three-phase ac relay switch S g_relay includes two states of 0 and 1, S g_relay =1 is ac relay closed;
The switch S g_pwm of the PWM wave generator comprises 0 and 1 states, wherein S g_pwm =1 is that the PWM wave generator is turned on to allow PWM waves to be generated, S g_pwm =0 is that the PWM generator is turned off, and all PWM waves are low level;
The closed-loop controller switch S g_cl includes two states of 0 and 1, S g_cl =1 is closed-loop controller on, and S g_cl =0 is closed-loop controller off.
The method is characterized by further limiting the technology, in the process of inhibiting the impact current in the starting process of the three-phase grid-connected converter, opening a three-phase alternating current relay switch and a closed-loop controller switch, closing a PWM wave generator switch to enable the three-phase grid-connected converter to operate in an open loop mode, adjusting the PWM wave generator switch to enable the three-phase alternating current relay switch to be opened after a first operation time, namely closing the PWM wave generator to enable a three-phase filter capacitor in the three-phase grid-connected converter to be charged, adjusting the three-phase alternating current relay switch to be closed after a second operation time, powering on the alternating current relay, reversely discharging the three-phase filter capacitor, and reducing the impact current generated in the starting process of the three-phase grid-connected converter.
Further, the first operation time is not less than 5ms, and the time difference between the second operation time and the first operation time is an integer multiple of the fundamental wave period of the power grid.
According to some embodiments, a second scheme of the present disclosure provides a starting inrush current suppression system for a three-phase grid-connected inverter, which adopts the following technical scheme:
a three-phase grid-tied converter start-up surge current suppression system comprising:
The switching module is configured to control the on-off of the alternating current relay based on a three-phase alternating current relay switch in the three-phase grid-connected converter, wherein a PWM wave generator switch for controlling the on-off of a PWM wave generator and a closed-loop controller switch for controlling the state of a closed-loop controller are additionally arranged in a control circuit of the three-phase grid-connected converter;
the coordinate transformation module is configured to conduct coordinate transformation on the current at the side of the inverter and the three-phase voltage at the public connection point of the power grid, and a current tracking command value and a voltage feedforward command value are respectively obtained;
And the suppression module is configured to combine the proportional-integral controller, the current tracking command value and the voltage feedforward command value, sequentially adjust the states of the closed-loop controller switch, the PWM wave generator switch and the three-phase alternating current relay switch, and suppress the impact current in the starting process of the three-phase grid-connected converter.
According to some embodiments, a third aspect of the present disclosure provides a computer-readable storage medium, which adopts the following technical solutions:
A computer readable storage medium having stored thereon a program which when executed by a processor performs steps in a method for starting up a inrush current suppression method for a three-phase grid-connected inverter according to the first aspect of the present disclosure.
According to some embodiments, a fourth aspect of the present disclosure provides an electronic device, which adopts the following technical solutions:
An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing steps in a method for starting up a inrush current suppression for a three-phase grid-connected inverter according to the first aspect of the disclosure when the program is executed by the processor.
Compared with the prior art, the beneficial effects of the present disclosure are:
the method has the advantages that the starting impact current of the grid-connected converter can be obviously reduced without additional hardware such as a current limiting resistor, a bypass relay and the like, meanwhile, the method is used for uniformly controlling the alternating current relay, and the method is simple to realize and has universality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
FIG. 1 is a flow chart of a method for suppressing startup inrush current of a three-phase grid-connected inverter in accordance with a first embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a three-phase grid-connected inverter according to a first embodiment of the disclosure;
FIG. 3 is a schematic diagram of a control architecture of a three-phase grid-connected inverter in accordance with a first embodiment of the present disclosure;
fig. 4 is a schematic diagram of a control structure when the three-phase grid-connected inverter turns off PWM waves (S g_pwm =0) in the first embodiment of the present disclosure;
Fig. 5 is a schematic diagram of a control structure of the three-phase grid-connected inverter in the first embodiment of the disclosure when the three-phase grid-connected inverter is operated in an open loop (S g_pwm＝1,Sg_cl =0);
Fig. 6 is a schematic diagram of a control structure of the three-phase grid-connected inverter in the first embodiment of the disclosure when the three-phase grid-connected inverter is in closed loop operation (S g_pwm＝1,Sg_cl =1);
FIG. 7 is a logic diagram of a three-phase grid-connected inverter startup current surge suppression control according to an embodiment of the present disclosure;
FIG. 8 is a timing chart of a three-phase grid-connected inverter start-up current surge suppression control in accordance with an embodiment of the present disclosure;
FIG. 9 is a waveform diagram of a three-phase grid-connected inverter startup experiment in accordance with one embodiment of the present disclosure;
Fig. 10 is a block diagram of a three-phase grid-connected inverter start-up surge current suppression system in a second embodiment of the present disclosure.
Detailed Description
The disclosure is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
Example 1
The embodiment of the disclosure first introduces a method for suppressing starting impact current of a three-phase grid-connected converter.
The method for suppressing the starting rush current of the three-phase grid-connected converter shown in fig. 1 comprises the following steps:
controlling the on-off of an alternating current relay based on a three-phase alternating current relay switch in the three-phase grid-connected converter;
A PWM wave generator switch for controlling the on-off of the PWM wave generator and a closed-loop controller switch for controlling the state of the closed-loop controller are additionally arranged in a three-phase grid-connected converter control circuit;
Coordinate transformation is carried out on the current at the side of the inverter and the three-phase voltage at the public connection point of the power grid, and a current tracking command value and a voltage feedforward command value are respectively obtained;
And sequentially adjusting states of the closed loop controller switch, the PWM wave generator switch and the three-phase alternating current relay switch by combining a proportional integral controller, a current tracking command value and a voltage feedforward command value, and inhibiting impulse current in the starting process of the three-phase grid-connected converter.
The common three-phase two-level grid-connected converter shown in fig. 2 comprises 6 power switching devices (S g1,Sg2,Sg3,Sg4,Sg5,Sg6), 1 three-phase LCL filter (consisting of 3 inversion side inductors L gi, 3 grid side inductors L gg and 3 filter capacitors C gf) and 1 three-phase alternating current relay, wherein the three-phase alternating current relay is controlled by a switching signal S g_relay, when S g_relay =1, the relay is closed and is switched on, and when S g_relay =0, the relay is switched off. In combination with the three-phase two-level grid-connected converter shown in fig. 2, three-phase voltage v gabc at the grid common connection point and inverter side three-phase current i giabc are sampled, and direct-current side voltage v gdc provides information for the controller.
In the three-phase grid-connected converter controller structure shown in fig. 3, no-static-difference tracking of command values is performed through a Proportional Integral (PI) controller, namely, the inverter side currents i gid and i giq in the dq0 coordinate system are respectively caused to track the command values i gid_ref and i giq_ref, and a phase-locked loop (PLL) provides an accurate phase θ g for abc/dq0 coordinate system transformation. The three-phase voltage v gabc at the public connection point of the power grid is transformed into v gd and v gq through an abc/dq0 coordinate system and is used as a feedforward instruction, S g_cl and S g_pwm are additional control signal switches added in the embodiment, closed-loop control is enabled when S g_cl =1, closed-loop control is closed when S g_cl =0, and open-loop control is entered. When S g_pwm =1, the PWM wave can be generated, and when S g_pwm =0, the PWM wave is turned off, and all PWM waves are low level.
The control structure diagram in the off PWM mode is shown in fig. 4, S g_pwm =0, the PWM wave is turned off, the driving level of all power switches is low, the control structure diagram in the open loop operation mode is shown in fig. 5, S g_pwm =1 and S g_cl =0, the grid-connected converter is operated in the open loop mode, the control structure diagram in the closed loop operation mode is shown in fig. 6, S g_pwm =1 and S g_cl =1, and the grid-connected converter is operated in the closed loop mode.
The control logic diagram of the starting current surge suppression of the three-phase grid-connected converter is shown in fig. 7, a surge current suppression strategy adds a control time sequence between shutdown (closing PWM) and closing of an alternating current relay, and in the process of suppressing surge current, the control logic diagram runs for a period of time in an open loop mode shown in fig. 5, runs for a period of time in a closing PWM mode shown in fig. 4, closes the alternating current relay (S g_relay =1), and runs normally in a closed loop mode shown in fig. 6. As shown in fig. 8, the starting current surge suppression control time sequence chart of the three-phase grid-connected inverter is that the typical time sequence of the surge current suppression strategy is that the open loop operation is performed for 50ms, the PWM mode is closed for 20ms, and then the ac relay is closed (S g_relay =1). The starting experiment waveform diagram of the three-phase grid-connected converter is shown in fig. 9, and further, it is verified that the method provided by the embodiment can effectively limit the impact current.
The embodiment can obviously reduce the starting impact current of the grid-connected converter without adding hardware such as a current limiting resistor, a bypass relay and the like, and meanwhile, the method disclosed by the invention uniformly controls the alternating current relay, is simple to realize and has universality.
Example two
The second embodiment of the disclosure introduces a starting impact current suppression system for a three-phase grid-connected converter.
A three-phase grid-tied inverter start-up surge current suppression system as shown in fig. 10, comprising:
The switching module is configured to control the on-off of the alternating current relay based on a three-phase alternating current relay switch in the three-phase grid-connected converter, wherein a PWM wave generator switch for controlling the on-off of a PWM wave generator and a closed-loop controller switch for controlling the state of a closed-loop controller are additionally arranged in a control circuit of the three-phase grid-connected converter;
the coordinate transformation module is configured to conduct coordinate transformation on the current at the side of the inverter and the three-phase voltage at the public connection point of the power grid, and a current tracking command value and a voltage feedforward command value are respectively obtained;
And the suppression module is configured to combine the proportional-integral controller, the current tracking command value and the voltage feedforward command value, sequentially adjust the states of the closed-loop controller switch, the PWM wave generator switch and the three-phase alternating current relay switch, and suppress the impact current in the starting process of the three-phase grid-connected converter.
The detailed steps are the same as those of the method for suppressing the starting rush current of the three-phase grid-connected converter provided in the first embodiment, and will not be repeated here.
Example III
A third embodiment of the present disclosure provides a computer-readable storage medium.
A computer readable storage medium having stored thereon a program which when executed by a processor performs the steps in a method for three-phase grid-connected inverter start-up inrush current suppression as described in the first embodiment of the present disclosure.
The detailed steps are the same as those of the method for suppressing the starting rush current of the three-phase grid-connected converter provided in the first embodiment, and will not be repeated here.
Example IV
The fourth embodiment of the disclosure provides an electronic device.
An electronic device includes a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor implements the steps in the method for suppressing the start-up rush current of the three-phase grid-connected inverter according to the first embodiment of the disclosure when executing the program.
The detailed steps are the same as those of the method for suppressing the starting rush current of the three-phase grid-connected converter provided in the first embodiment, and will not be repeated here.
The foregoing description of the preferred embodiments of the present disclosure is provided only and not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
While the specific embodiments of the present disclosure have been described above with reference to the drawings, it should be understood that the present disclosure is not limited to the embodiments, and that various modifications and changes can be made by one skilled in the art without inventive effort on the basis of the technical solutions of the present disclosure while remaining within the scope of the present disclosure.
Claims (6)
1. The method for suppressing the starting impact current of the three-phase grid-connected converter is characterized by comprising the following steps of:
controlling the on-off of an alternating current relay based on a three-phase alternating current relay switch in the three-phase grid-connected converter;
A PWM wave generator switch for controlling the on-off of the PWM wave generator and a closed-loop controller switch for controlling the state of the closed-loop controller are additionally arranged in a three-phase grid-connected converter control circuit;
Coordinate transformation is carried out on the current at the side of the inverter and the three-phase voltage at the public connection point of the power grid, and a current tracking command value and a voltage feedforward command value are respectively obtained;
Sequentially adjusting states of the closed loop controller switch, the PWM wave generator switch and the three-phase alternating current relay switch by combining a proportional integral controller, a current tracking command value and a voltage feedforward command value, and inhibiting impulse current in the starting process of the three-phase grid-connected converter;
the three-phase grid-connected converter comprises a power semiconductor switch, a three-phase LCL filter and a three-phase alternating current relay which are sequentially connected, wherein the power semiconductor switch adopts a three-phase bridge type power semiconductor switch and comprises a first bridge arm, a second bridge arm and a third bridge arm, the first bridge arm comprises a first power switching device and a fourth power switching device, the second bridge arm comprises a third power switching device and a sixth power switching device, and the third bridge arm comprises a second power switching device and a fifth power switching device;
The three-phase LCL filter comprises a three-phase inversion side inductor, a three-phase network side inductor and a three-phase filter capacitor, wherein one side of the three-phase inversion side inductor is respectively arranged among the first bridge arm, the second bridge arm and the third bridge arm, and the other side of the three-phase inversion side inductor is respectively connected with the three-phase network side inductor;
The three-phase alternating current relay switch S g_relay comprises 0 and 1 states, wherein S g_relay =1 is that the alternating current relay is closed, and S g_relay =0 is that the alternating current relay is opened;
The switch S g_pwm of the PWM wave generator comprises 0 and 1 states, wherein S g_pwm =1 is that the PWM wave generator is turned on to allow PWM waves to be generated, S g_pwm =0 is that the PWM generator is turned off, and all PWM waves are low level;
The closed-loop controller switch S g_cl comprises two states of 0 and 1, wherein S g_cl =1 is that the closed-loop controller is opened, and S g_cl =0 is that the closed-loop controller is closed;
In the process of inhibiting the impact current in the starting process of the three-phase grid-connected converter, a three-phase alternating current relay switch and a closed-loop controller switch are opened, a PWM wave generator switch is closed to open the three-phase grid-connected converter to operate, after a first operation time is reached, the PWM wave generator switch is regulated to be opened, namely, the PWM wave generator is closed to charge a three-phase filter capacitor in the three-phase grid-connected converter, after a second operation time is reached, the three-phase alternating current relay switch is regulated to be closed, the alternating current relay is electrified, the three-phase filter capacitor is reversely discharged, and the impact current generated in the starting process of the three-phase grid-connected converter is reduced.
2. The method for suppressing the starting rush current of the three-phase grid-connected inverter according to claim 1, wherein the first power switching device, the second power switching device, the third power switching device, the fourth power switching device, the fifth power switching device and the sixth power switching device all switch a transistor unit, the transistor unit comprises a triode and a diode which is reversely connected in parallel between a collector and an emitter of the triode, an anode of the diode is connected with the emitter of the triode, and a cathode of the diode is connected with the collector of the triode.
3. The method for suppressing the starting up rush current of a three-phase grid-connected inverter according to claim 1, wherein the first operation time is not less than 5ms, and the time difference between the second operation time and the first operation time is an integer multiple of the fundamental period of the power grid.
4. A three-phase grid-connected inverter starting rush current suppression system employing the three-phase grid-connected inverter starting rush current suppression method according to any one of claims 1 to 3, comprising:
The switching module is configured to control the on-off of the alternating current relay based on a three-phase alternating current relay switch in the three-phase grid-connected converter, wherein a PWM wave generator switch for controlling the on-off of a PWM wave generator and a closed-loop controller switch for controlling the state of a closed-loop controller are additionally arranged in a control circuit of the three-phase grid-connected converter;
the coordinate transformation module is configured to conduct coordinate transformation on the current at the side of the inverter and the three-phase voltage at the public connection point of the power grid, and a current tracking command value and a voltage feedforward command value are respectively obtained;
And the suppression module is configured to combine the proportional-integral controller, the current tracking command value and the voltage feedforward command value, sequentially adjust the states of the closed-loop controller switch, the PWM wave generator switch and the three-phase alternating current relay switch, and suppress the impact current in the starting process of the three-phase grid-connected converter.
5. A computer-readable storage medium having a program stored thereon, which when executed by a processor, implements the steps in the three-phase grid-connected inverter startup inrush current suppression method as claimed in any one of claims 1 to 3.
6. An electronic device comprising a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor, when executing the program, performs the steps in the method for suppressing startup inrush current for a three-phase grid-connected inverter as defined in any one of claims 1-3.
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| CN102780414A (en) * | 2012-01-13 | 2012-11-14 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN111669041A (en) * | 2020-05-28 | 2020-09-15 | 合肥工业大学 | Slow start control method of high power and high boost ratio DC converter |
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| CN103312140B (en) * | 2013-06-07 | 2015-06-10 | 南京航空航天大学 | Starting method of multi-branch two-stage three-phase photovoltaic grid-connected inverter |
| CN106655270B (en) * | 2016-12-29 | 2019-06-18 | 华中科技大学 | Control Method for Suppressing Rectifier Start-up Impulse Current of Three-phase LCL Grid-connected Converter |
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| CN102780414A (en) * | 2012-01-13 | 2012-11-14 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN111669041A (en) * | 2020-05-28 | 2020-09-15 | 合肥工业大学 | Slow start control method of high power and high boost ratio DC converter |
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