CN101860041B - Method for dynamically adjusting busbar voltage to improve grid connection efficiency - Google Patents
Method for dynamically adjusting busbar voltage to improve grid connection efficiency Download PDFInfo
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- CN101860041B CN101860041B CN2010101708137A CN201010170813A CN101860041B CN 101860041 B CN101860041 B CN 101860041B CN 2010101708137 A CN2010101708137 A CN 2010101708137A CN 201010170813 A CN201010170813 A CN 201010170813A CN 101860041 B CN101860041 B CN 101860041B
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Abstract
The invention relates to a method for dynamically adjusting busbar voltage to improve grid connection efficiency. The working range of grid voltage from lowest limit to highest limit is divided into at least two levels and each level corresponds to a set busbar voltage directive value; and a control system detects the effective value of the grid voltage in real time, and when the grid voltage is within one level, if the busbar voltage directive value at the moment is not equal to the set busbar voltage directive value corresponding to the level, the busbar voltage directive value is adjusted to the set value. Since the amplitude of the busbar voltage is dynamically adjusted according to the grid voltage value detected in real time, the invention has the advantages that the overall efficiency and the reliability of the grid-connected inverter are improved, the device stress is reduced and the service life of the capacitor is prolonged.
Description
Technical field
The present invention relates to the control method of combining inverter, be specifically related to the method that a kind of dynamic adjustment busbar voltage improves grid connection efficiency.
Background technology
The primary condition that combining inverter is incorporated into the power networks is: the busbar voltage amplitude is not less than the line voltage peak value.For the combining inverter that adopts the multi-stage transformation topological structure; Particularly prime is a booster circuit, middle for bus supports electric capacity, the back level is to make its output busbar voltage satisfy the primary condition that is incorporated into the power networks after the combining inverter of inverter circuit, the DC input voitage of combining inverter will pass through the booster circuit conversion.Usually adopt at present the stable method that is controlled at fixed voltage value of busbar voltage.
Usually require combining inverter to have the operating voltage range V of broad
L～V
H, to adapt to the frequent fluctuation of electrical network, promptly line voltage is at V
L～V
HBetween the time, combining inverter can normally move.If by existing control method, busbar voltage is controlled at fixed value, is to satisfy the primary condition that is incorporated into the power networks, and busbar voltage needs greater than the peak value of high line voltage, i.e. 1.414*V
HAnd work as line voltage is V
LThe time, busbar voltage only needs 1.414*V
LGet final product.For example regulation combining inverter operating voltage range is 190V-264V, 1.414*V
H=373.3V considers voltage ripple again, and busbar voltage should be at least 400V so, and combining inverter remains under the higher busbar voltage always and moves.And when line voltage was 190V, as long as busbar voltage reaches 300V, combining inverter can normally be incorporated into the power networks.Be controlled at 400V if busbar voltage is still stable at this moment, can have following problem:
1) when the input direct voltage of combining inverter during less than 300V; Booster circuit through prime boosts to 400V with busbar voltage, compares with boosting to 300V, and the duty ratio of booster circuit is much bigger; Not only reduce the efficient of booster circuit, and increased the stress of boosting circuit device;
2) when the input dc power of combining inverter is pressed between 300V～400V, if will control busbar voltage is 400V, booster circuit also must be worked, and has not only reduced system effectiveness, and has increased the action frequency of switch, makes lifetime of system and reliability reduce.
3) the control busbar voltage has increased the stress of bus support electric capacity, the useful life of having reduced electric capacity always at high voltage;
4) the control busbar voltage has increased the stress of inverter circuit device, and has reduced inversion efficiency always at high voltage.
Summary of the invention
In order to overcome the problems referred to above, the present invention proposes a kind of line voltage peak value through real-time detection and adjusts the DC voltage booster circuit output voltage, i.e. the method for DC bus-bar voltage amplitude has improved the overall efficiency of combining inverter.
A kind of dynamic adjustment busbar voltage improves the method for grid connection efficiency; Be applicable to the combining inverter that adopts multistage change-over circuit; Be specially: prime is that booster circuit, centre are DC input voitage process booster circuit for bus capacitor, back level are the combining inverter of inverter circuit, its primary condition that is incorporated into the power networks, and makes the voltage magnitude of bus capacitor be not less than the line voltage peak value; According to the line voltage value of real-time detection, dynamically adjust the amplitude of DC bus-bar voltage.
A kind of dynamic adjustment busbar voltage improves the method for grid connection efficiency, according to the following steps: with the line voltage minimum and the working range of high limit be divided at least two shelves, each grade correspondence is set with the busbar voltage command value; The effective value of the real-time detection of grid voltage of control system; When line voltage be arranged in when dividing one of them gear; If busbar voltage instruction this moment is not equal to the corresponding busbar voltage command value of setting of this grade, then adjusts busbar voltage and instruct to the busbar voltage command value of setting;
A kind of dynamic adjustment busbar voltage improves the method for grid connection efficiency, through slowly increase/mode of subtracting makes the busbar voltage command value of busbar voltage instruction for setting.
A kind of method that improves combining inverter efficient, with the line voltage minimum and the per 5～20V of working range of high limit be divided into shelves.
A kind of method that improves combining inverter efficient, when line voltage be arranged in when dividing one of them gear, confirm that line voltage is positioned at this shelves after continuing a period of time.
A kind of method that improves combining inverter efficient, when line voltage be arranged in when dividing one of them gear, continue to confirm after 5～30 seconds that line voltage is positioned at this shelves.
With the line voltage scope is that 190V～264V is an example, when line voltage is 190V, through control method of the present invention, will bring following beneficial effect:
1) when the input direct voltage of combining inverter during less than 300V, the booster circuit through prime boosts to 300V with busbar voltage, and the duty ratio of booster circuit is less, has improved the efficient of booster circuit, has reduced the stress of boosting circuit device;
2) when the input dc power of combining inverter is pressed between 300V～400V, because busbar voltage is 300V, combining inverter can be incorporated into the power networks; So this moment; Booster circuit needn't be worked, and has reduced the action frequency of switch, has improved the overall efficiency and the reliability of combining inverter;
3) busbar voltage is lower, has reduced the stress that bus supports electric capacity, has prolonged electric capacity useful life;
4) busbar voltage is lower, has reduced the stress of inverter circuit device, has improved inversion efficiency.
Can draw from above analysis, adopt the present invention,, dynamically adjust the amplitude of busbar voltage, improve the overall efficiency and the reliability of combining inverter, and reduced stresses of parts, prolong the service life of electric capacity based on the line voltage value of real-time detection.
Description of drawings
Fig. 1 is a line voltage gear decision flow chart.
Fig. 2 is for to obtain the busbar voltage instruction flow chart according to different electrical network voltage gears position.
Embodiment
Embodiment 1
Referring to shown in Figure 1.The minimum of line voltage and the highest limit probably have the working range of 70V.Regulate too frequently in order to be unlikely to busbar voltage, in the control system scope of 70V being divided into 7 every 10V of gear is shelves.The first step, at first control system will be judged current electrical network gear, the effective value of the real-time detection of grid voltage of control system, when the effective value of line voltage greater than 190V but less than 200V and when continuing 20 seconds, think that the electrical network gear equals 1 grade this moment; The instantaneous fluctuation of electrical network is very frequent during real work, so when judging the voltage gear of electrical network, have only when electrical network remains on a certain gear bands continuously to continue 20S, just judges to switch to this grade.When the effective value of line voltage greater than 200V but less than 210V and when continuing 20 seconds, think that the electrical network gear equals 2 grades this moment; When the effective value of line voltage greater than 210V but less than 220V and when continuing 20 seconds, think that the electrical network gear equals 3 grades this moment; When the effective value of line voltage greater than 220V but less than 230V and when continuing 20 seconds, think that the electrical network gear equals 4 grades this moment; When the effective value of line voltage greater than 230V but less than 240V and when continuing 20 seconds, think that the electrical network gear equals 5 grades this moment; When the effective value of line voltage greater than 240V but less than 250V and when continuing 20 seconds, think that the electrical network gear equals 6 grades this moment; When the effective value of line voltage greater than 250VV and when continuing 20 seconds, think that the electrical network gear equals 7 grades this moment.Second step, then confirm the size that busbar voltage is instructed based on the gear of line voltage, as shown in Figure 2: when the electrical network gear was 1 grade, it is then given to 310V through the mode that slowly increases and decreases that the instruction of the busbar voltage of this moment is not equal to 310V; When the electrical network gear was 2 grades, it is then given to 330V through the mode of slowly increase and decrease that the instruction of the busbar voltage of this moment is not equal to 330V; When the electrical network gear was 3 grades, it is then given to 340V through the mode of slowly increase and decrease that the instruction of the busbar voltage of this moment is not equal to 340V; When the electrical network gear was 4 grades, it is then given to 360V through the mode of slowly increase and decrease that the instruction of the busbar voltage of this moment is not equal to 360V; When the electrical network gear was 5 grades, it is then given to 370V through the mode of slowly increase and decrease that the instruction of the busbar voltage of this moment is not equal to 370V; When the electrical network gear was 6 grades, it is then given to 390V through the mode of slowly increase and decrease that the instruction of the busbar voltage of this moment is not equal to 390V; When the electrical network gear was 7 grades, it is then given to 400V through the mode of slowly increase and decrease that the instruction of the busbar voltage of this moment is not equal to 400V.
Embodiment 2
The minimum of line voltage and the highest limit probably have the working range of 70V.Regulate too frequently in order to be unlikely to busbar voltage, in the control system scope of 70V being divided into 7 every 10V of gear is shelves.The first step; At first control system will be judged current electrical network gear, the effective value of the real-time detection of grid voltage of control system, when the effective value of line voltage greater than 190V but less than 200V; Think that the electrical network gear equals 1 grade this moment, and other each grade judgement is carried out with the method.All the other are with embodiment 1.
Embodiment 3
The minimum of line voltage and the highest limit probably have the working range of 70V.Regulate too frequently in order to be unlikely to busbar voltage, in the control system scope of 70V being divided into 7 every 10V of gear is shelves.The first step; At first control system will be judged current electrical network gear, the effective value of the real-time detection of grid voltage of control system, when the effective value of line voltage greater than 190V but less than 200V; Think that the electrical network gear equals 1 grade this moment, and other each grade judgement is carried out with the method.Then confirm the size of busbar voltage instruction according to the gear of line voltage, as shown in Figure 2: when the electrical network gear was 1 grade, it is then given to 310V that the instruction of the busbar voltage of this moment is not equal to 310V; All the other are with embodiment 1.
Claims (5)
1. dynamically adjust the method that busbar voltage improves grid connection efficiency for one kind; Prime is that booster circuit, centre are the combining inverter of inverter circuit for bus capacitor, back level; Its primary condition that is incorporated into the power networks is that DC input voitage is through booster circuit; Make the voltage magnitude of bus capacitor be not less than the line voltage peak value,, dynamically adjust the amplitude of DC bus-bar voltage according to the line voltage value of real-time detection; It is characterized in that according to the following steps: with the line voltage minimum and the working range of high limit be divided at least two shelves, each grade correspondence is set with the busbar voltage command value; The effective value of the real-time detection of grid voltage of control system; When line voltage be arranged in when dividing one of them gear; If busbar voltage instruction this moment is not equal to the corresponding busbar voltage command value of setting of this grade, then adjusts busbar voltage and instruct to the busbar voltage command value of setting.
2. a kind of dynamic adjustment busbar voltage according to claim 1 improves the method for grid connection efficiency, it is characterized in that: through slowly increase/mode of subtracting makes the busbar voltage command value of busbar voltage instruction for setting.
3. a kind of dynamic adjustment busbar voltage according to claim 1 improves the method for grid connection efficiency, it is characterized in that with the line voltage minimum and the per 5～20V of working range of high limit be divided into shelves.
4. a kind of dynamic adjustment busbar voltage according to claim 1 improves the method for grid connection efficiency, it is characterized in that definite line voltage is positioned at this shelves after lasting a period of time when line voltage is arranged in institute and divides one of them gear.
5. a kind of dynamic adjustment busbar voltage according to claim 4 improves the method for grid connection efficiency, it is characterized in that when line voltage is arranged in institute and divides one of them gear, lasting after 5～30 seconds definite line voltage be positioned at this shelves.
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| CN2010101708137A CN101860041B (en) | 2010-05-04 | 2010-05-04 | Method for dynamically adjusting busbar voltage to improve grid connection efficiency |
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| CN104426402B (en) | 2013-09-09 | 2018-04-20 | 南京博兰得电子科技有限公司 | A kind of inverter and its DC bus-bar voltage adjusting method |
| CN103762828B (en) * | 2013-12-31 | 2017-09-22 | 上海科世达-华阳汽车电器有限公司 | A kind of control method and device of multistage power electronic converter system |
| CN109066777A (en) * | 2018-08-13 | 2018-12-21 | 青海伟航北创新能源科技有限公司 | Photovoltaic power generation grid-connecting output power control method |
| CN110829439A (en) * | 2019-11-18 | 2020-02-21 | 贵州电网有限责任公司 | Intelligent transformer gear shifting method based on voltage out-of-limit starting optimal algorithm |
| CN111628660B (en) * | 2020-06-05 | 2021-08-27 | 浙江鲲悟科技有限公司 | Compressor variable frequency speed regulating system and control method of direct current bus voltage |
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| CN101051793A (en) * | 2007-05-21 | 2007-10-10 | 哈尔滨九洲电气股份有限公司 | Megawatt direct driving type wind and electric joint-net current transformer |
| CN101304221A (en) * | 2008-06-19 | 2008-11-12 | 江苏津恒能源科技有限公司 | Solar photovoltaic interconnected inverter |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
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| US6949843B2 (en) * | 2003-07-11 | 2005-09-27 | Morningstar, Inc. | Grid-connected power systems having back-up power sources and methods of providing back-up power in grid-connected power systems |
| US7929325B2 (en) * | 2008-05-27 | 2011-04-19 | General Electric Company | High efficiency, multi-source photovoltaic inverter |
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| CN101051793A (en) * | 2007-05-21 | 2007-10-10 | 哈尔滨九洲电气股份有限公司 | Megawatt direct driving type wind and electric joint-net current transformer |
| CN101304221A (en) * | 2008-06-19 | 2008-11-12 | 江苏津恒能源科技有限公司 | Solar photovoltaic interconnected inverter |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
Non-Patent Citations (1)
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| 许颇等.基于BOOST变换器的小型风力机并网逆变控制系统设计.《太阳能学报》.2007,第28卷(第3期), * |
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