CN201789306U - Solar grid-connected inverter with starting point test function - Google Patents

Solar grid-connected inverter with starting point test function Download PDF

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Publication number
CN201789306U
CN201789306U CN2010205257283U CN201020525728U CN201789306U CN 201789306 U CN201789306 U CN 201789306U CN 2010205257283 U CN2010205257283 U CN 2010205257283U CN 201020525728 U CN201020525728 U CN 201020525728U CN 201789306 U CN201789306 U CN 201789306U
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Prior art keywords
inverter
solar
solar panel
input
filter
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Expired - Lifetime
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CN2010205257283U
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高拥兵
谭均承
朱军卫
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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Abstract

The utility model discloses a solar grid-connected inverter with a starting point test function, which comprises a control circuit, a filter and an inverter unit. The solar grid-connected inverter is characterized in that an auxiliary switching tube and a test resistor are further arranged at an input end of the filter, one end of the resistor is connected with an output anode of a solar panel while the other end of the resistor is connected with a collector electrode or a drain electrode of the auxiliary switching tube, an emitter electrode or a source electrode of the auxiliary switching tube Q is connected with an input cathode of the solar panel, and a control electrode of the auxiliary switching tube is connected with the control circuit. In the technical scheme, voltage sampling precision is higher, the resistance value of the resistor can be preset, and no-load power consumption of a specific inverter can be tested in advance. By the aid of a test circuit adopting the technical scheme, whether the maximum output power of the input solar panel is higher than the no-load power consumption of the inverter or not can be determined accurately, and in-time starting for grid-connected power generation can be realized according to test results, so that solar energy outputted by the solar panel can be utilized sufficiently.

Description

Solar grid-connected inverter with start point test function
Technical field
The utility model relates to solar grid-connected inverter, or other input sources are the energy storage conversion equipment of solar panel etc., specifically a kind of solar grid-connected inverter with start point test function.
Background technology
The function of solar grid-connected inverter is that the direct current inversion that solar panel sends is converted into and the alternating electromotive force of public electric wire net with the frequency homophase, is fed in the electrical network.
Because sun natural lighting characteristic limitations, solar panel need experience unglazed photograph at night/no-output voltage-daytime every day to be looked after progressively enhancing/output voltage and power and progressively increases-reach noon peak power-dusk illumination and weaken/operating state transfer process that output voltage and power progressively reduce.Because the characteristic of solar panel, in this process, the output voltage and the power output of solar panel are not directly proportional, and that is to say, can not infer the size of its power output ability according to the output voltage values of solar panel.As shown in Figure 1, when light intensity reduced, the equal approximately linear of the Maximum Power Output of solar panel and electric current descended, and the unloaded output voltage of cell panel reduces seldom (this voltage is relevant with ambient temperature more).Solar panel from evening in the transition on daytime, under faint illumination, can export higher voltage, but exportable power may be smaller.And for inverter, in case start the work of being incorporated into the power networks, power conversion circuit and filter circuit will produce loss, even power output is zero, this loss value also will keep suitable level.Working loss no-load power consumption when the inverter power output is zero, its size be by power device of inverter, operating frequency, filter circuit, parameters such as control circuit decisions, for the inverter of middle low power grade, its no-load power consumption generally at tens W between the hundreds of W.If it is too early that the start condition is set, start in solar cell power output deficiency, self conversion consumed power of inverter is greater than (this maximum power is by the control of inverter maximal power tracing from the available maximal input of cell panel, also be that MPPT realizes), to consume the electrical network energy on the contrary, not reach the purpose of generating; If it is late excessively that the start-up point is set, can not make full use of the output energy of cell panel again, but the loss generated output.
Therefore, how accurately judging the power output ability of cell panel, in time start the inverter work of being incorporated into the power networks according to its power output ability, to make full use of the solar electric power under the low light level, is the problem that inverter need solve.
At the problems referred to above, existing technical scheme has following two kinds:
1) only judge the start point according to the output voltage (being the PV+ among Fig. 2, voltage between the PV-) of cell panel, after inverter detects input voltage and reaches minimum operating voltage (or minimum operating voltage+certain value), the control inverter start.As the SG6K inverter that Hefei Sunlight Power Supply Co., Ltd. produces, put down in writing in its operation instructions: (the MPPT following range of corresponding inverter is 320V~650V), promptly begin to prepare to generate electricity by way of merging two or more grid systems after the direct voltage that detects the input cell panel surpasses 340V.
Promptly carry out maximal power tracing after the inverter start according to the solar inverter MPPT controlling schemes of routine, trace into after the maximum power point if find, the DC side input current of inverter still very little (the exportable maximum power of corresponding cell panel is less), turn-off inverter after then delaying time 3 minutes, change standby mode over to.
The deficiency of this scheme is, only judge start according to input voltage, can't accurately discern the actual exportable maximum power capability of current cell panel, under the situation of cell panel real output deficiency, start shooting easily, because of the power output of cell panel consumes the electrical network electric energy less than the no-load power consumption of inverter.But perhaps waste the cell panel generated energy because of postponing start.
2) after inverter detects input voltage and reaches operating voltage (this voltage is the open circuit output voltage of cell panel) scope, the switching tube of the control inverter (Q1 among Fig. 1, Q3 or Q2, Q4) open-minded continuously, to import the cell panel short circuit like this, inverter side flows through the electric current of power tube, be the output short circuit current of cell panel, obtain the exportable maximum power that input pull-down voltage and short circuit current come the counting cell plate according to test, determine whether start (the exportable maximum power=open circuit voltage * short circuit current * activity coefficient of cell panel).If the exportable maximum power of the cell panel that calculates is greater than the no-load power consumption of this inverter, then control is started shooting.Start back inverter comes maximal power tracing according to the maximal power tracing control of self; If the exportable maximum power of the cell panel that calculates is lower, then do not start shooting, carry out same test process after the time-delay again, until satisfying the predetermined condition start.
The deficiency of this scheme is:
A. the activity coefficient of cell panel is according to the variety classes battery, and under different operational environments, its excursion is quite big, and therefore, cell panel open circuit voltage and short circuit current according to test are difficult to accurately calculate the current exportable maximum power of cell panel.
B. simultaneously because the sampling precision of current sampling circuit when little electric current relatively poor (sampling error be generally rated value about 1%), to look after when more weak when morning, its short circuit current is also less, and the test error of electric current is bigger.
C. power tube continuously conducting in test process continues to flow through the short circuit current of cell panel, and is influential to the functional reliability of power tube.
Summary of the invention
To be solved in the utility model is the prior art above shortcomings, aim to provide a kind of maximum exportable power capability that can accurately discern the input side cell panel, start is in time generated electricity by way of merging two or more grid systems, to make full use of solar energy after its power output is greater than the no-load power consumption of inverter.Can avoid in solar panel power output deficiency start like this,, and consume the electrical network energy on the contrary because of the power output of cell panel no-load power consumption less than inverter; The condition setting of perhaps starting shooting is too high, postpones the inverter available machine time, and causes the energy dissipation of solar panel.
The technical scheme that addresses the above problem employing is: the solar grid-connected inverter with start point test function, comprise control circuit, filter and inversion unit, the input anode of filter and negative terminal connect the output cathode and the negative pole of solar panel respectively, the input of the output termination inversion unit of filter, it is characterized in that also being provided with an auxiliary switch and a test resistance at the input of filter, the output cathode of described resistance one end and solar panel links to each other, the collector electrode of the other end and auxiliary switch or drain electrode link to each other, the input negative pole of the emitter of auxiliary switch Q or source electrode and solar panel links to each other, the control utmost point connection control circuit of auxiliary switch.
Wherein the value of resistance be chosen as the minimum operating voltage of inverter square/the inverter no-load power consumption.The optional MOSFET of auxiliary switch, IGBT or relay etc. similarly has the device of switching characteristic.
When input voltage reached default start thresholding, the control auxiliary switch was open-minded in short-term, and resistance R will be added in as load and import on the cell panel like this, judge cell panel power output ability by the cell plate voltage after the stable testing.If stable back inverter input voltage still is higher than minimum operating voltage, then show the no-load power consumption of the power output of cell panel greater than inverter, show then that inverter can be started shooting to generate electricity by way of merging two or more grid systems that the control auxiliary switch disconnects, and starts inverter work; Otherwise, if this moment, the inverter input voltage was lower than minimum operating voltage, show that then the maximum exportable power of importing solar panel is lower than the no-load loss of inverter, inverter should not be started shooting, then continue test (perhaps for avoiding resistance to power up for a long time causing overheated, can consider that auxiliary switch temporarily disconnects, commissioning again after the time-delay), until satisfying the start condition.
In this programme, the precision of voltage sample is higher, resistance is predeterminable, simultaneously for specific inverter, therefore its no-load power consumption can be tested in advance and obtain, and by the test circuit of this programme, whether the exportable maximum power that can judge the input solar panel greater than the no-load power consumption of inverter more accurately, and according to test result start is in time generated electricity by way of merging two or more grid systems, to realize making full use of to cell panel output solar energy.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the output volt-ampere characteristics of figure of solar panel.
Fig. 2 is the structural representation of existing solar inverter.
Fig. 3 is the structural representation of the utility model solar inverter.
Embodiment
With reference to Fig. 3, the utlity model has the solar grid-connected inverter of start point test function, comprise control circuit, filter and inversion unit, the input anode of filter and negative terminal connect the output cathode and the negative pole of solar panel respectively, the input of the output termination inversion unit of filter, it is characterized in that also being provided with an auxiliary switch Q and a test resistance R at the input of filter, the output cathode of described resistance R one end and solar panel links to each other, the collector electrode of the other end and auxiliary switch Q or drain electrode link to each other, the input negative pole of the emitter of auxiliary switch Q or source electrode and solar panel links to each other, the control utmost point connection control circuit of auxiliary switch Q.
Wherein the value of resistance R be chosen as the minimum operating voltage of inverter square/the inverter no-load power consumption.The optional MOSFET of auxiliary switch, IGBT or relay etc. similarly has the device of switching characteristic.
When input voltage reached default start thresholding, the control auxiliary switch was open-minded in short-term, and resistance R will be added in as load and import on the cell panel like this, judge cell panel power output ability by the cell plate voltage after the stable testing.If stable back inverter input voltage still is higher than minimum operating voltage, then show the no-load power consumption of the power output of cell panel greater than inverter, show then that inverter can be started shooting to generate electricity by way of merging two or more grid systems that the control auxiliary switch disconnects, and starts inverter work; Otherwise, if this moment, the inverter input voltage was lower than minimum operating voltage, show that then the maximum exportable power of importing solar panel is lower than the no-load loss of inverter, inverter should not be started shooting, then continue test (perhaps for avoiding resistance to power up for a long time causing overheated, can consider that auxiliary switch temporarily disconnects, commissioning again after the time-delay), until satisfying the start condition.
What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any innovation and creation that do not exceed in the utility model connotation scope all fall within the protection range of the present utility model.

Claims (3)

1. the solar grid-connected inverter that has start point test function, comprise control circuit, filter and inversion unit, the input anode of filter and negative terminal connect the output cathode and the negative pole of solar panel respectively, the input of the output termination inversion unit of filter, it is characterized in that also being provided with an auxiliary switch (Q) and a test resistance (R) at the input of filter, the output cathode of described resistance (R) end and solar panel links to each other, the collector electrode of the other end and auxiliary switch (Q) or drain electrode link to each other, the input negative pole of the emitter of auxiliary switch (Q) or source electrode and solar panel links to each other, the control utmost point connection control circuit of auxiliary switch (Q).
2. the solar grid-connected inverter with start point test function as claimed in claim 1, the value that it is characterized in that described resistance (R) be the minimum operating voltage of inverter square remove the inverter no-load power consumption.
3. the solar grid-connected inverter with start point test function as claimed in claim 1 or 2 is characterized in that auxiliary switch (Q) is MOSFE T, IGBT or relay.
CN2010205257283U 2010-09-10 2010-09-10 Solar grid-connected inverter with starting point test function Expired - Lifetime CN201789306U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102253278A (en) * 2011-04-25 2011-11-23 上海正泰电源系统有限公司 Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)
CN102545259A (en) * 2012-01-16 2012-07-04 山亿新能源股份有限公司 Derating interval method for ride-through voltage
CN102624086A (en) * 2012-03-28 2012-08-01 广东易事特电源股份有限公司 Night-off type alternating-current power grid power-taking photovoltaic inverter
CN102843022A (en) * 2011-06-23 2012-12-26 深圳市汇川技术股份有限公司 System and method for suppressing repeat start of photovoltaic inverter
CN103973149A (en) * 2013-01-24 2014-08-06 欧姆龙株式会社 Power conditioner, photovoltaic system and abnormality determination method
CN106253332A (en) * 2016-08-18 2016-12-21 江苏兆伏爱索新能源有限公司 A kind of photovoltaic DC-to-AC converter starts method, device and the photovoltaic DC-to-AC converter controlled
CN103856064B (en) * 2012-11-28 2017-06-09 Abb公司 Operate the method and inverter of inverter
CN112843491A (en) * 2021-02-08 2021-05-28 深圳天基权健康科技集团股份有限公司 Switching circuit, semiconductor laser treatment equipment and power supply switching control method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102253278A (en) * 2011-04-25 2011-11-23 上海正泰电源系统有限公司 Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)
CN102843022A (en) * 2011-06-23 2012-12-26 深圳市汇川技术股份有限公司 System and method for suppressing repeat start of photovoltaic inverter
CN102545259A (en) * 2012-01-16 2012-07-04 山亿新能源股份有限公司 Derating interval method for ride-through voltage
CN102624086A (en) * 2012-03-28 2012-08-01 广东易事特电源股份有限公司 Night-off type alternating-current power grid power-taking photovoltaic inverter
CN103856064B (en) * 2012-11-28 2017-06-09 Abb公司 Operate the method and inverter of inverter
US9728959B2 (en) 2012-11-28 2017-08-08 Abb Oy Method for operating an inverter and an inverter
CN103973149A (en) * 2013-01-24 2014-08-06 欧姆龙株式会社 Power conditioner, photovoltaic system and abnormality determination method
CN103973149B (en) * 2013-01-24 2017-01-11 欧姆龙株式会社 Power conditioner, photovoltaic system and abnormality determination method
CN106253332A (en) * 2016-08-18 2016-12-21 江苏兆伏爱索新能源有限公司 A kind of photovoltaic DC-to-AC converter starts method, device and the photovoltaic DC-to-AC converter controlled
CN112843491A (en) * 2021-02-08 2021-05-28 深圳天基权健康科技集团股份有限公司 Switching circuit, semiconductor laser treatment equipment and power supply switching control method
CN112843491B (en) * 2021-02-08 2021-10-08 深圳天基权健康科技集团股份有限公司 Switching circuit, semiconductor laser treatment equipment and power supply switching control method

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Granted publication date: 20110406