CN101540510B - Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system - Google Patents
Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system Download PDFInfo
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- CN101540510B CN101540510B CN 200810102070 CN200810102070A CN101540510B CN 101540510 B CN101540510 B CN 101540510B CN 200810102070 CN200810102070 CN 200810102070 CN 200810102070 A CN200810102070 A CN 200810102070A CN 101540510 B CN101540510 B CN 101540510B
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Abstract
The invention provides a method for eliminating secondary pulsation interference on the middle DC side in a two-stage grid-connected system. The method comprises the step that because the reverse compensation of the secondary harmonic pulsation in the middle DC link is made by a secondary harmonic compensation module added in the DC/DC link at the preceding stage, the secondary pulsation interference is eliminated and the middle DC voltage is stabilized. The method has the advantages that the middle filtering link is unnecessary, and in the system, a filtering device is unnecessarily arranged on the middle DC side; the inversion control bandwidth is not affected; and the control performance of the system is improved without adding any equipment.
Description
Technical field
The present invention is mainly used in the single-phase converter system of two-stage, is particularly useful for eliminating in the two-stage grid-connected converter system of middle low power of similar grid-connected photovoltaic system the method that the pulsation of intermediate dc side secondary is disturbed.
Technical background
Adopt in the single-phase converter system of two-layer configuration, back level grid-connecting apparatus (DC/AC link) adopts the single-phase PWM combining inverter, because single-phase PWM (pulse width modulation, Pulse Width Modulation) restriction of current transformer self topological structure, DC side inevitably exists the secondary pulsation of power therebetween.And the secondary pulsation of intermediate dc side voltage can have influence on the control of inverter.And can cause the fluctuation of grid-connected current, have a strong impact on the waveform quality that is incorporated into the power networks.
Mostly traditional control method is that the method for middle DC side being carried out filtering guarantees that the secondary pulsation of intermediate dc side voltage has a strong impact on controlling not cause, and still, similarly method has reduced bandwidth, has reduced the dynamic corresponding of system.
Summary of the invention
Technical problem to be solved by this invention provides a kind of middle filtering link that do not need, by the pulsation of prime DC/DC link compensation intermediate dc link secondary, improve the two-stage grid-connected system of the control performance of grid-connected system and eliminate the method that the pulsation of intermediate dc side secondary is disturbed.
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, may further comprise the steps,
(1) the single-phase PWM inverter of back level DC/AC control module control disturbs in the pulsation of intermediate dc link generation secondary;
(2) add the Second-harmonic compensation module in prime DC/DC link, secondary pulsation interference signal is fed back to the Second-harmonic compensation module;
(3) the Second-harmonic compensation module provides the compensating signal switch command D^ref of secondary pulsation interference signal according to feedback;
(4) compensating signal and original D*ref signal stack, become the Dref signal, as the controlled quentity controlled variable of the switching tube duty ratio of prime DC/DC control module, by the secondary pulsation counter-bonification of Dref to middle DC link, eliminate the secondary pulsation and disturb, stablize middle dc voltage.
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, and the feedback of secondary pulsation can obtain in several ways,, calculates sampling or the like as filtering.
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, when the single-phase full bridge inversion is worked, intermediate dc side inevitably can superpose a DC component and the pulsation of secondary, and under the input power of determining, second harmonic pulsation and DC component are all determined.And this second harmonic component can be by calculating or measuring.Utilize the DC/DC link of prime, add the opposite Second-harmonic compensation power of applying aspect in the DC/DC link is input to the power of intermediate dc side, as counter-bonification power, the counter-bonification power that is added is opposite with the phase place of the second harmonic pulsation that full-bridge inverting produces.Like this,, can eliminate the secondary pulsation and disturb, make middle dc voltage reach stable by the counter-bonification of DC/DC link.
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, filtering link in the middle of not needing, promptly do not need the bandwidth of middle link is limited, make middle dc voltage stabilize to a constant, additionally do not adding under the condition of any equipment, improving the control performance of system.
Description of drawings
Fig. 1 is the pulsating waveform schematic diagram, and wherein a is secondary pulsating waveform figure, b position Second-harmonic compensation pulsating waveform figure;
Fig. 2 is control principle figure of the present invention
Embodiment
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, may further comprise the steps,
(1) the single-phase PWM inverter of back level DC/AC control module control inevitably produces secondary pulsation interference in the intermediate dc link.
(2) add the Second-harmonic compensation module in prime DC/DC link, the secondary pulsation disturbs the mode by filtering to be fed back to the Second-harmonic compensation module.
(3) the Second-harmonic compensation module provides the compensating signal switch command D^ref signal of secondary pulsation according to feedback, obtains the compensating signal of secondary pulsation.
(4) compensating signal and original D*ref signal stack becomes the Dref signal, and as the controlled quentity controlled variable of the switching tube duty ratio of prime DC/DC control module, Dref adds compensation to middle DC link secondary pulsation, eliminates the secondary pulsation and disturbs, and stablizes middle dc voltage.
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, when the single-phase full bridge inversion is worked, intermediate dc side inevitably can superpose a DC component and the pulsation of secondary, and under the input power of determining, second harmonic pulsation and DC component are all determined.And this second harmonic component can be by calculating or measuring.Utilize the DC/DC link of prime, add the opposite second harmonic pulsation of applying aspect in the DC/DC link is input to the power of intermediate dc side, as counter-bonification power, the phase place that the secondary that pulsation of counter-bonification second harmonic and the full-bridge inverting that is added produces is pulsed is opposite.Like this,, eliminate the secondary pulsation and disturb, make middle dc voltage reach stable by the counter-bonification of DC/DC link.
Two-stage grid-connected system of the present invention is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, control method by the pulsation of DC/DC prime compensation intermediate dc side secondary, filtering link in the middle of not needing, promptly do not need the bandwidth of middle link is limited, make middle dc voltage stabilize to a constant.System need not add filter in the intermediate dc side; Can not impact inversion control bandwidth; Additionally do not add the control performance that any equipment can improve system.
Claims (2)
1. two-stage grid-connected system is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, and it is characterized in that, may further comprise the steps:
(1) add the Second-harmonic compensation module in prime DC/DC link, the single-phase PWM inverter of back level DC/AC control module control feeds back to the Second-harmonic compensation module in the secondary pulsation interference signal that the intermediate dc link produces;
(2) the Second-harmonic compensation module provides the compensating signal switch command D^ref of secondary pulsation interference signal according to feedback;
(3) compensating signal switch command D^ref and original switch command D*ref signal stack, become switch command Dref signal, controlled quentity controlled variable as the switching tube duty ratio of prime DC/DC control module, by the secondary pulsation counter-bonification of switch command Dref to middle DC link, eliminate the secondary pulsation and disturb, stablize middle dc voltage.
2. two-stage grid-connected system according to claim 1 is eliminated the method that the pulsation of intermediate dc side secondary is disturbed, and it is characterized in that, the feedback that the secondary pulsation is disturbed obtains by the mode of filtering, calculating, sampling.
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| CN 200810102070 CN101540510B (en) | 2008-03-17 | 2008-03-17 | Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system |
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| CN 200810102070 CN101540510B (en) | 2008-03-17 | 2008-03-17 | Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system |
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| CN101540510A CN101540510A (en) | 2009-09-23 |
| CN101540510B true CN101540510B (en) | 2011-07-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106130062A (en) * | 2016-06-27 | 2016-11-16 | 安徽工业大学 | A kind of two-stage type grid-connected photovoltaic system and intermediate dc side voltage stabilizing method |
| JP7220307B2 (en) | 2021-01-14 | 2023-02-09 | 深▲せん▼市正浩創新科技股▲ふん▼有限公司 | INVERTER SYSTEM, INVERTER SYSTEM CONTROL METHOD AND PARALLEL INVERTER SYSTEM |
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| CN101877549B (en) * | 2010-06-08 | 2012-07-25 | 南京航空航天大学 | Method for inhibiting two-stage type orthogonal inverter input current low-frequency impulse |
| CN103023059B (en) * | 2011-09-23 | 2016-04-27 | 通用电气公司 | Energy conversion system and method for operation, photovoltaic generating system |
| CN103872683B (en) * | 2012-12-18 | 2017-01-18 | 西门子公司 | Compensation device used for eliminating second harmonic pulsation in inverter and electrical power system |
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| CN106026726B (en) * | 2016-05-30 | 2018-05-04 | 中车永济电机有限公司 | A kind of secondary pulsation suppressing method of inverter side applied to single-phase rectifier electric power system |
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| JP7220307B2 (en) | 2021-01-14 | 2023-02-09 | 深▲せん▼市正浩創新科技股▲ふん▼有限公司 | INVERTER SYSTEM, INVERTER SYSTEM CONTROL METHOD AND PARALLEL INVERTER SYSTEM |
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Assignee: QINGDAO NENGGAO ELECTRIC CO., LTD. Assignor: Beijing Nego Automation Technology Co., Ltd. Contract record no.: 2011370000496 Denomination of invention: Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system Granted publication date: 20110727 License type: Exclusive License Open date: 20090923 Record date: 20111123 |
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