CN103326601A - Current-impact-free grid-connecting control method of PWM rectifier - Google Patents
Current-impact-free grid-connecting control method of PWM rectifier Download PDFInfo
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- CN103326601A CN103326601A CN2013101682770A CN201310168277A CN103326601A CN 103326601 A CN103326601 A CN 103326601A CN 2013101682770 A CN2013101682770 A CN 2013101682770A CN 201310168277 A CN201310168277 A CN 201310168277A CN 103326601 A CN103326601 A CN 103326601A
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Abstract
The invention provides a current-impact-free grid-connecting control method of a PWM rectifier. The current-impact-free grid-connecting control method of the PWM rectifier includes the following steps that firstly, PLL phase locking succeeds and a mark showing successful phase locking is installed; secondly, a bus voltage detecting value is obtained; thirdly, if grid-connecting is started or not is judged, if not, a bus voltage objective value is the bus voltage detecting value; fourthly, the closed loop vector control algorithm is performed so as to obtain the voltage control objective value and PWM is generated; fifthly, if grid-connecting is started or not is judged, if yes, the next step is performed, if not, the second step is performed again; sixthly, a PWM pulse is sent to an IGBT and the second step is performed again. The current-impact-free grid-connecting control method of the PWM rectifier is used for PWM rectifier grid-connecting control so that current-impact-free grid-connecting of the PWM rectifier can be easily achieved when grid-connecting is performed and the problem that current impact exists in a traditional grid-connecting method can be effectively solved.
Description
Technical field
The present invention relates to the control field that is incorporated into the power networks, particularly a kind of grid-connected control method of PWM rectifier no current impact.
Background technology
Existing typical Three-Phase PWM Rectifier system construction drawing, as shown in Figure 2, this system through net side filter inductance, three-phase IGBT rectifier bridge, dc energy storage capacitor filtering, forms four-quadrant PWM rectifier by three-phase alternating current, and RL provides DC power supply for load.Traditional PWM rectifier control flow chart after phase-locked success, judges whether first to be incorporated into the power networks as shown in Figure 3, if be not incorporated into the power networks instruction, waits for so always, and the at this moment output of current controller is namely controlled voltage-target and is in init state.The instruction in case be incorporated into the power networks, the comprehensive busbar voltage desired value of DSP or MCU microcontroller and busbar voltage detected value, obtain the active current desired value through voltage controller, the reactive current desired value is set as a constant (for example being zero) usually, meritorious and reactive current produces target control voltage through current controller respectively, target control voltage produces pwm pulse and is applied on the IGBT after PWM generator, finally reach the purpose of PWM rectifier busbar voltage, active current, reactive current control.But because voltage, current controller contain integral operation usually, this target control voltage is realistic objective control voltage not necessarily, but also may depart from far, therefore, if the pwm pulse that produces with target control voltage at this moment is applied on the IGBT, very likely produce undesirable rush of current phenomenon.
Perhaps, in traditional PWM rectifier control flow chart, after if the instruction of being incorporated into the power networks has been arranged, make the busbar voltage desired value taper to set point by a ramp function, because the control voltage-target is in init state, and this initialized state might not be just right, therefore when a pwm pulse is applied on the IGBT, also very likely can produce undesirable rush of current phenomenon.
Based on this, prior art awaits improving really.
Summary of the invention
For the deficiencies in the prior art, the invention provides the grid-connected control method that a kind of PWM rectifier no current impacts, be incorporated into the power networks so that can easily realize that the no current of PWM rectifier impacts when being incorporated into the power networks, effectively solve the current impact that exists in traditional combination method.
For realizing above purpose, the present invention is achieved by the following technical programs:
The invention provides the grid-connected control method that a kind of PWM rectifier no current impacts, it is characterized in that, described method comprises the following steps:
Phase-locked successfully sign is put in the phase-locked success of S1:PLL;
S2: obtain the busbar voltage detected value;
S3: judge whether to start and be incorporated into the power networks, if not, then the busbar voltage desired value is described busbar voltage detected value;
S4: carry out the closed-loop vector control algolithm, obtain the voltage control desired value, and produce PWM;
S5: judge whether to start and be incorporated into the power networks, if so, execution in step S6, otherwise execution in step S2;
S6: send out pwm pulse to IGBT, return execution in step S2.
Preferably, also comprise before the described step S1:
S0: carry out PLL phase-locked, and judge whether described PLL is phase-locked successful, if so, execution in step S1, otherwise continue execution in step S0.
Preferably, described step S3 further comprises: judge whether to start and be incorporated into the power networks, if so, then described busbar voltage desired value is set point, and continues execution in step S4.
Preferably, the required synchronous rotary angular speed of described closed-loop vector control algolithm is consistent with electrical network angular speed.
Preferably, described closed-loop vector control algolithm may further comprise the steps:
S41: according to described busbar voltage desired value, utilize voltage controller that described busbar voltage detected value is controlled, obtain the active current desired value, and set the reactive current desired value;
S42: obtain the electrical network input current, through conversion gained merit, the Detecting Reactive Current value;
S43: described meritorious, Detecting Reactive Current value produces described voltage control desired value through current controller respectively.
The grid-connected control method of the present invention by providing a kind of PWM rectifier no current to impact, being used for the PWM rectifier is incorporated into the power networks, before being incorporated into the power networks, by making the target busbar voltage equal actual bus voltage, and operation closed-loop vector control algolithm, the no current that can easily realize the PWM rectifier when being incorporated into the power networks impacts and to be incorporated into the power networks, and effectively solves the current impact that exists in traditional combination method, even overcurrent cause the being incorporated into the power networks problem of failure may occur.
Description of drawings
Fig. 1 is the flow chart of one embodiment of the invention;
Fig. 2 is the Three-Phase PWM Rectifier system construction drawing of prior art;
Fig. 3 is the control flow chart that is incorporated into the power networks of the Three-Phase PWM Rectifier of prior art.
Embodiment
Regard to down the grid-connected control method that a kind of PWM rectifier no current proposed by the invention impacts, describe in detail in conjunction with the accompanying drawings and embodiments.
As shown in Figure 1, the grid-connected control method that the present embodiment provides a kind of PWM rectifier no current to impact is characterized in that described method comprises the following steps:
Phase-locked successfully sign is put in the phase-locked success of S1:PLL;
S2: obtain the busbar voltage detected value;
S3: judge whether to start and be incorporated into the power networks, if not, then the busbar voltage desired value is described busbar voltage detected value;
S4: carry out the closed-loop vector control algolithm, obtain the voltage control desired value, and produce PWM;
S5: judge whether to start and be incorporated into the power networks, if so, execution in step S6, otherwise execution in step S2;
S6: send out pwm pulse to IGBT, return execution in step S2.
Preferably, also comprise before the described step S1:
S0: carry out PLL phase-locked, and judge whether described PLL is phase-locked successful, if so, execution in step S1, otherwise continue execution in step S0.
Preferably, described step S3 further comprises: judge whether to start and be incorporated into the power networks, if so, then described busbar voltage desired value is set point, and continues execution in step S4.
Preferably, the required synchronous rotary angular speed of described closed-loop vector control algolithm is consistent with electrical network angular speed.
Preferably, described closed-loop vector control algolithm may further comprise the steps:
S41: according to described busbar voltage desired value, utilize voltage controller that described busbar voltage detected value is controlled, obtain the active current desired value, and set the reactive current desired value;
S42: obtain the electrical network input current, through conversion gained merit, the Detecting Reactive Current value;
S43: described meritorious, Detecting Reactive Current value produces described voltage control desired value through current controller respectively.
In the present embodiment, the technique scheme concrete operations are as follows:
After phase-locked success, obtain first the busbar voltage detected value, judge whether to be incorporated into the power networks, if be not incorporated into the power networks instruction, carry out the control algolithm consistent with tradition control this moment, different is, make the busbar voltage desired value equal the busbar voltage detected value, after voltage controller, because there is certain deviation in the busbar voltage detected value, the active current instruction is close to zero, but may be non-vanishing.Meritorious and reactive current produces target control voltage through current controller respectively, and through a plurality of loop cycle, the target control voltage of this moment satisfies the requirement that no current impacts when being incorporated into the power networks initial condition fully.The instruction in case be incorporated into the power networks, the busbar voltage desired value can be suddenlyd change, and also can taper to set point, obtains the active current desired value through voltage controller, and meritorious and reactive current produces target control voltage through current controller respectively.The target control voltage of this moment produces the just control voltage of expectation, is applied on the IGBT by the pwm pulse of its generation.
When being incorporated into the power networks moment, the busbar voltage desired value is sudden change not, meritorious, the also not sudden change of reactive current desired value, the control voltage that current closed-loop control produces can not suddenly change yet, and because whole control algolithm is in simulation actual vector state of a control, therefore the pwm pulse Complete Synchronization of pwm pulse and actual needs coincide, and the power tube that is opened (such as IGBT) operating state can be brought impact hardly on whole circuit, and unique influential dead band factor can be ignored.
Be incorporated into the power networks in rear a period of time, the busbar voltage desired value gradually changes to set point, meritorious, reactive current desired value also gradually changes, the control voltage that current closed-loop control produces also gradually changes, therefore actual pwm pulse also is to change gradually, electric current can not undergone mutation, also do not have any shock problem.
The present embodiment needs a plurality of control cycles to keep the busbar voltage desired values equal the busbar voltage detected value after phase-locked success, before the instruction of being incorporated into the power networks.Yet control cycle is usually shorter, and the situation in the test is the surperficial time that only needs 1-2 the specified cycle of electrical network also, just can allow the target control voltage stabilization get off fully, and, usually after phase-locked success, before the instruction of being incorporated into the power networks, this time is not strict.Therefore this control method satisfies the system sequence control requirement of PWM rectifier fully.
When the invention solves the initial condition problem of target control voltage when being incorporated into the power networks, another benefit of bringing is not strict to the parameter of voltage controller and current controller.This be because, moment only is that variation has occured the busbar voltage desired value before and after being incorporated into the power networks, other all control variables all are continually varyings before and after be incorporated into the power networks.
In addition, no matter be single-phase, three-phase, or polyphase system, no matter be the PWM rectifier, or PWM reactive-load compensator, also or other need to be incorporated into the power networks, PWM power electronic systems such as wind-powered electricity generation unsteady flow, photovoltaic generation, as long as be incorporated into the power networks according to the method for the invention, scarcely current impact can appear.
The grid-connected control method of the present invention by providing a kind of PWM rectifier no current to impact, being used for the PWM rectifier is incorporated into the power networks, before being incorporated into the power networks, by making the target busbar voltage equal actual bus voltage, and operation closed-loop vector control algolithm, the no current that can easily realize the PWM rectifier when being incorporated into the power networks impacts and to be incorporated into the power networks, and effectively solves the current impact that exists in traditional combination method, even overcurrent cause the being incorporated into the power networks problem of failure may occur.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that do not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (5)
1. the grid-connected control method that PWM rectifier no current impacts is characterized in that, comprises the following steps:
Phase-locked successfully sign is put in the phase-locked success of S1:PLL;
S2: obtain the busbar voltage detected value;
S3: judge whether to start and be incorporated into the power networks, if not, then the busbar voltage desired value is described busbar voltage detected value;
S4: carry out the closed-loop vector control algolithm, obtain the voltage control desired value, and produce PWM;
S5: judge whether to start and be incorporated into the power networks, if so, execution in step S6, otherwise execution in step S2;
S6: send out pwm pulse to IGBT, return execution in step S2.
2. the grid-connected control method of PWM rectifier no current impact as claimed in claim 1 is characterized in that, also comprises before the described step S1:
S0: carry out PLL phase-locked, and judge whether described PLL is phase-locked successful, if so, execution in step S1, otherwise continue execution in step S0.
3. the grid-connected control method of PWM rectifier no current impact as claimed in claim 2 is characterized in that, described step S3 further comprises: judge whether to start and be incorporated into the power networks, if so, then described busbar voltage desired value is set point, and continues execution in step S4.
4. the grid-connected control method that impacts such as each described PWM rectifier no current of claim 1-3 is characterized in that, the required synchronous rotary angular speed of described closed-loop vector control algolithm is consistent with electrical network angular speed.
5. the grid-connected control method of PWM rectifier no current impact as claimed in claim 4 is characterized in that, described closed-loop vector control algolithm may further comprise the steps:
S41: according to described busbar voltage desired value, utilize voltage controller that described busbar voltage detected value is controlled, obtain the active current desired value, and set the reactive current desired value;
S42: obtain the electrical network input current, through conversion gained merit, the Detecting Reactive Current value;
S43: described meritorious, Detecting Reactive Current value produces described voltage control desired value through current controller respectively.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196496A (en) * | 2017-06-19 | 2017-09-22 | 西安理工大学 | The vector type soft-start method of PWM rectifier |
| CN111564982A (en) * | 2020-06-01 | 2020-08-21 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
| CN116526818A (en) * | 2023-01-30 | 2023-08-01 | 山东艾诺智能仪器有限公司 | Startup and shutdown control method for three-level PWM rectifier |
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| CN101106279A (en) * | 2007-06-19 | 2008-01-16 | 华南理工大学 | Merged network and power adjustment system for direct drive permanent magnetic synchronization generator and its method |
| CN102222931A (en) * | 2011-04-19 | 2011-10-19 | 吉林省电力有限公司电力科学研究院 | Microgrid three-phase grid-connected inverter system and control method thereof |
| CN103078526A (en) * | 2013-01-08 | 2013-05-01 | 广东志成冠军集团有限公司 | Current source type rectifier and grid-connected control method based on virtual resistor |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106279A (en) * | 2007-06-19 | 2008-01-16 | 华南理工大学 | Merged network and power adjustment system for direct drive permanent magnetic synchronization generator and its method |
| CN102222931A (en) * | 2011-04-19 | 2011-10-19 | 吉林省电力有限公司电力科学研究院 | Microgrid three-phase grid-connected inverter system and control method thereof |
| CN103078526A (en) * | 2013-01-08 | 2013-05-01 | 广东志成冠军集团有限公司 | Current source type rectifier and grid-connected control method based on virtual resistor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196496A (en) * | 2017-06-19 | 2017-09-22 | 西安理工大学 | The vector type soft-start method of PWM rectifier |
| CN111564982A (en) * | 2020-06-01 | 2020-08-21 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
| CN111564982B (en) * | 2020-06-01 | 2022-02-08 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
| CN116526818A (en) * | 2023-01-30 | 2023-08-01 | 山东艾诺智能仪器有限公司 | Startup and shutdown control method for three-level PWM rectifier |
| CN116526818B (en) * | 2023-01-30 | 2024-03-19 | 山东艾诺智能仪器有限公司 | Startup and shutdown control method for three-level PWM rectifier |
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Effective date of registration: 20170214 Address after: 430205 Hubei province Wuhan city East Lake high tech Zone three Buddha Ridge Road 6, hiconics Industrial Park Patentee after: Wuhan Union Electric Drive Technology Co., Ltd. Address before: 430000 Hubei city of Wuhan province East Lake high tech Development Zone, three Buddha Ridge Road 6, hiconics Industrial Park Patentee before: Hop Technology (Wuhan) Co., Ltd. |
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