CN103701151A - Software control method for solving low energy input and repeated starting of single-phase photovoltaic inverter - Google Patents
Software control method for solving low energy input and repeated starting of single-phase photovoltaic inverter Download PDFInfo
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- CN103701151A CN103701151A CN201410009002.7A CN201410009002A CN103701151A CN 103701151 A CN103701151 A CN 103701151A CN 201410009002 A CN201410009002 A CN 201410009002A CN 103701151 A CN103701151 A CN 103701151A
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Abstract
The invention discloses a software control method for solving low energy input and repeated starting of a single-phase photovoltaic inverter. The method comprises the following steps of installing a switchable power supply; always maintaining to monitor the input voltage, the busbar voltage and the output energy of the inverter in the working processing of the inverter by a software control unit, when the input voltage is too low, the busbar voltage is too low or the output energy is too low, closing the inverter, continuously maintaining the actuation state of a relay, and starting a timer T1; when both the input voltage and the busbar voltage meet the grid-connection requirement, starting a timer T2, and when the time of the T2 is greater than a set low energy recovery time, starting the grid-connection operation again; when the time of the T1 is greater than a set low energy mode duration time, disconnecting the relay. Due to the adoption of the software control method for solving low energy input and repeated starting of the single-phase photovoltaic inverter, the startup times and the shutdown times of the inverter and the action times of the relay are reduced, and therefore the service lives of the inverter and the relay are prolonged.
Description
Technical field
The present invention relates to a kind of control of photovoltaic DC-to-AC converter, specifically a kind ofly solve the software control method that the low-yield input of single-phase photovoltaic DC-to-AC converter starts repeatedly.
Background technology
It is CN202872349U that State Intellectual Property Office discloses publication number on April 10th, 2013, and patent name is the utility model patent that utilizes the Circuits System of IGBT temperature control inverter power output derate.
The grid-connected startup of traditional single phase photovoltaic combining inverter is controlled, and is under the N/R prerequisite of system, and judgement input voltage satisfies condition and just starts and net operation.And when the weather such as morning, evening and wet weather, photovoltaic panel output voltage is higher, but its output energy is lower.Conventional inverter only meets grid-connected condition by simple judgement input voltage in the case, just start to start and net operation, inverter is just access grid-connected just to be dragged down input voltage, and this can cause inverter always in continuous start and stop state, thereby has affected the useful life of inverter.
The function of photovoltaic DC-to-AC converter is that the direct current of solar panel output is converted into and the alternating electromotive force of public electric wire net with frequency homophase, is fed in electrical network.Because photovoltaic combining inverter is powered by direct current input side mostly, solar panel changes the variation with illumination, when input energy shortage is (as most evil bad cloud, sooner or later the low light level shines) time, and there is a larger loss in inverter work, and when the energy shortage in the accumulate pond of inverter, thereby make power supply always in start and stop state, this will cause inverter to occur frequent switching on and shutting down, relay frequent movement, not only reduced the useful life of inverter and relay, and can not when recovering, input energy carry out in time and net operation again, photovoltaic generation utilance is reduced.
Therefore, reducing inverter switching device machine number of times and actuating of relay number of times, is the problem that inverter need to solve.
Summary of the invention
The object of the invention is to solve above-mentioned technical deficiency part, the software control method that provides a kind of low-yield input of the single-phase photovoltaic DC-to-AC converter of solution repeatedly to start.
For achieving the above object, the technical solution adopted in the present invention is:
Solve the software control method that the low-yield input of single-phase photovoltaic DC-to-AC converter starts repeatedly, comprise the following steps:
A, installation switchable power supply, switchable power supply, to take the direct current of solar panel output as main, the alternating current of electrical network of take is auxiliary power supply, when the direct current energy of solar panel output is not enough, electrical network be can automatically switch to, will inverter, relay and controller power supply after the AC rectification of electrical network and filtering, be;
B, startup inverter, inverter is in normal and network process, and under system non-failure conditions, relay maintains attracting state;
C, in the inverter course of work, software control unit keeps input voltage, the busbar voltage to inverter always, and output energy is monitored, when input voltage is during lower than input low pressure threshold values, or busbar voltage is during lower than bus low pressure threshold values, or power output is during lower than low-power threshold values, closes inverter, relay continues to maintain attracting state, starts timer T1;
After D, startup timer T1, software control unit is monitored in real time to input voltage, busbar voltage, when input voltage and busbar voltage all meet grid-connected requirement, start timer T2, when low-yield recovery time that the timing of T2 is greater than setting is during T_Clr, software control unit exits low energy model, restarts and net operation; When the timing of T1 is greater than the low energy model duration T _ Pro of setting, be that low energy model cannot reach the threshold voltage that recovers grid-connected time within one lasting period, think that people is for cutting off input switch or in night, now software control unit disconnects relay, stops grid-connected inverters and attempts.
In described step C, in the inverter course of work, software control unit carries out the grid-connected work of maximal power tracing (MPPT).
In described step D, restart and during net operation, software control unit detects operation to relay, after relay test passes through, startup inverter.
In described step C, when input voltage can keep minimum starting state, when only busbar voltage cannot maintain, software control unit controls inverter carries out inversion output with impulse form.
Beneficial effect of the present invention: due to the software control method that adopts the low-yield input of the single-phase photovoltaic DC-to-AC converter of above-mentioned solution repeatedly to start, the method has reduced inverter switching device machine number of times and actuating of relay number of times, thereby has extended the useful life of inverter and relay.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The flow chart that Fig. 1 is the software control method that solves the low-yield input of single-phase photovoltaic DC-to-AC converter and repeatedly start.
Embodiment
As shown in Figure 1, solve the software control method that the low-yield input of single-phase photovoltaic DC-to-AC converter starts repeatedly, comprise the following steps:
A, installation switchable power supply, switchable power supply, to take the direct current of solar panel output as main, the alternating current of electrical network of take is auxiliary power supply, when the direct current energy of solar panel output is not enough, electrical network be can automatically switch to, will inverter, relay and controller power supply after the AC rectification of electrical network and filtering, be;
B, startup inverter, inverter is in normal and network process, and under system non-failure conditions, relay maintains attracting state;
C, in the inverter course of work, software control unit carries out the grid-connected work of maximal power tracing (MPPT), and software control unit keeps input voltage, busbar voltage to inverter always, and output energy monitors, when input voltage is during lower than input low pressure threshold values, or busbar voltage is during lower than bus low pressure threshold values, or power output is during lower than low-power threshold values, close inverter, relay continues to maintain attracting state, starts timer T1; When input voltage can keep minimum starting state, when only busbar voltage cannot maintain, software control unit controls inverter carries out inversion output with impulse form;
After D, startup timer T1, software control unit is monitored in real time to input voltage, busbar voltage, when input voltage and busbar voltage all meet grid-connected requirement, start timer T2, when low-yield recovery time that the timing of T2 is greater than setting is during T_Clr, software control unit exits low energy model, restart and net operation, restart and during net operation, software control unit detects operation to relay, after relay test passes through, start inverter; When the timing of T1 is greater than the low energy model duration T _ Pro of setting, be that low energy model cannot reach the threshold voltage that recovers grid-connected time within one lasting period, think that people is for cutting off input switch or in night, now software control unit disconnects relay, stops grid-connected inverters and attempts.
The above is the preferred embodiment of the present invention; certainly can not limit with this interest field of the present invention; should be understood that; for those skilled in the art; technical scheme of the present invention is modified or is equal to replacement, do not depart from the protection range of technical solution of the present invention.
Claims (4)
1. one kind solves the software control method that the low-yield input of single-phase photovoltaic DC-to-AC converter starts repeatedly, it is characterized in that: comprise the following steps: A, installation switchable power supply, switchable power supply, to take the direct current of solar panel output as main, the alternating current of electrical network of take is auxiliary power supply, when the direct current energy of solar panel output is not enough, can automatically switch to electrical network, will after the AC rectification of electrical network and filtering, be that inverter, relay and controller are powered; B, startup inverter, inverter is in normal and network process, and under system non-failure conditions, relay maintains attracting state; C, in the inverter course of work, software control unit keeps input voltage, the busbar voltage to inverter always, and output energy is monitored, when input voltage is during lower than input low pressure threshold values, or busbar voltage is during lower than bus low pressure threshold values, or power output is during lower than low-power threshold values, closes inverter, relay continues to maintain attracting state, starts timer T1; After D, startup timer T1, software control unit is monitored in real time to input voltage, busbar voltage, when input voltage and busbar voltage all meet grid-connected requirement, start timer T2, when the timing of T2 is greater than the low-yield recovery time of setting, software control unit exits low energy model, restarts and net operation; The low energy model that is greater than setting when the timing of T1 is during the duration, be that low energy model cannot reach the threshold voltage that recovers grid-connected time within one lasting period, think that people is for cutting off input switch or in night, now software control unit disconnects relay, stops grid-connected inverters and attempts.
2. the software control method that the low-yield input of the single-phase photovoltaic DC-to-AC converter of solution according to claim 1 starts repeatedly, is characterized in that: in described step C, in the inverter course of work, software control unit carries out the grid-connected work of maximal power tracing.
3. the software control method that the low-yield input of the single-phase photovoltaic DC-to-AC converter of solution according to claim 1 starts repeatedly, it is characterized in that: in described step D, restart and during net operation, software control unit detects operation to relay, after relay test passes through, start inverter.
4. the software control method that the low-yield input of the single-phase photovoltaic DC-to-AC converter of solution according to claim 1 starts repeatedly, it is characterized in that: in described step C, when input voltage can keep minimum starting state, when only busbar voltage cannot maintain, software control unit controls inverter carries out inversion output with impulse form.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158219A (en) * | 2014-08-27 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter shutdown control method and system and photovoltaic power generation system |
| CN106169880A (en) * | 2016-06-24 | 2016-11-30 | 广州三晶电气股份有限公司 | A kind of discontinuous operation control method of group of string data photovoltaic DC-to-AC converter |
| CN108258889A (en) * | 2018-03-13 | 2018-07-06 | 易事特集团股份有限公司 | Auxiliary power supply of photovoltaic inverter system |
| CN110492835A (en) * | 2019-07-29 | 2019-11-22 | 努比亚技术有限公司 | A kind of adjust automatically solar charging method for electrically, wearable device and storage medium |
| CN112737304A (en) * | 2021-04-06 | 2021-04-30 | 浙江艾罗网络能源技术股份有限公司 | Starting control method of photovoltaic inverter and photovoltaic inverter system |
| CN114265468A (en) * | 2021-12-22 | 2022-04-01 | 深圳航天东方红卫星有限公司 | Solar cell array power regulation and fusion system |
| CN114784876A (en) * | 2022-06-17 | 2022-07-22 | 浙江艾罗网络能源技术股份有限公司 | Detection method for reverse electricity taking of photovoltaic inverter |
| CN117811092A (en) * | 2024-02-29 | 2024-04-02 | 锦浪科技股份有限公司 | Starting method of photovoltaic optimizer system based on wireless communication |
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| CN201270420Y (en) * | 2008-09-22 | 2009-07-08 | 珠海赛比特电气设备有限公司 | Starting circuit for photovoltaic grid connected inverter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158219A (en) * | 2014-08-27 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter shutdown control method and system and photovoltaic power generation system |
| CN106169880A (en) * | 2016-06-24 | 2016-11-30 | 广州三晶电气股份有限公司 | A kind of discontinuous operation control method of group of string data photovoltaic DC-to-AC converter |
| CN106169880B (en) * | 2016-06-24 | 2018-11-02 | 广州三晶电气股份有限公司 | A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter |
| CN108258889A (en) * | 2018-03-13 | 2018-07-06 | 易事特集团股份有限公司 | Auxiliary power supply of photovoltaic inverter system |
| CN110492835A (en) * | 2019-07-29 | 2019-11-22 | 努比亚技术有限公司 | A kind of adjust automatically solar charging method for electrically, wearable device and storage medium |
| CN112737304A (en) * | 2021-04-06 | 2021-04-30 | 浙江艾罗网络能源技术股份有限公司 | Starting control method of photovoltaic inverter and photovoltaic inverter system |
| CN112737304B (en) * | 2021-04-06 | 2021-07-06 | 浙江艾罗网络能源技术股份有限公司 | Starting control method of photovoltaic inverter and photovoltaic inverter system |
| CN114265468A (en) * | 2021-12-22 | 2022-04-01 | 深圳航天东方红卫星有限公司 | Solar cell array power regulation and fusion system |
| CN114784876A (en) * | 2022-06-17 | 2022-07-22 | 浙江艾罗网络能源技术股份有限公司 | Detection method for reverse electricity taking of photovoltaic inverter |
| CN117811092A (en) * | 2024-02-29 | 2024-04-02 | 锦浪科技股份有限公司 | Starting method of photovoltaic optimizer system based on wireless communication |
| CN117811092B (en) * | 2024-02-29 | 2024-05-14 | 锦浪科技股份有限公司 | Starting method of photovoltaic optimizer system based on wireless communication |
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