CN102291026A - Solar photovoltaic grid-connected inverter and solar convertible frequency air-conditioning system - Google Patents
Solar photovoltaic grid-connected inverter and solar convertible frequency air-conditioning system Download PDFInfo
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- CN102291026A CN102291026A CN2011102402528A CN201110240252A CN102291026A CN 102291026 A CN102291026 A CN 102291026A CN 2011102402528 A CN2011102402528 A CN 2011102402528A CN 201110240252 A CN201110240252 A CN 201110240252A CN 102291026 A CN102291026 A CN 102291026A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a solar photovoltaic grid-connected inverter. The solar photovoltaic grid-connected inverter comprises a power circuit and a control circuit, wherein the power circuit comprises a DC/DC (direct current/direct current) unit, a DC/AC (direct current/alternating current) unit and a filtering unit; and the control unit comprises a main control unit and an MPPT (Maximum Power Point Tracking) unit, so that the control unit can acquire digital and/or analog signals from the power circuit, control power devices in the power circuit after finishing corresponding calculation and dynamically track maximum power points in a solar cell array to regulate working points of the solar cell array. The invention further discloses a solar convertible frequency air-conditioning system which comprises the solar cell array, a DC voltage boosting module, the solar photovoltaic grid-connected inverter and a DC convertible frequency air conditioner; the solar cell array, the DC voltage boosting module and the DC convertible frequency air conditioner are sequentially connected; and the solar photovoltaic grid-connected inverter is connected between the DC voltage boosting module and a commercial power grid. According to the invention, the air conditioner can be commonly driven by solar energy and commercial power and electrical energy can be fed back to the commercial power grid when the air conditioner is idle or the solar energy is surplus.
Description
Technical field
The present invention relates to power electronics and household electrical appliance technical field, be specifically related to a kind of solar energy frequency-conversion air-conditioning system that is applied to the solar photovoltaic interconnected inverter of aircondition and uses this inverter.
Background technology
As the most potential energy of 21 century, solar energy with its clean environment firendly, contain advantage such as abundant and progressively obtain development and use.Occurred solar air conditioner at present, mostly be heat pipe-type greatly, its principle is with solar energy heating heat pipe or hot water, the thermal refrigerating of reusable heat pipe or hot water or heat, and its solar energy utilization is comparatively limited.Along with the research that solar energy is used in household electrical appliance is goed deep into, the air conditioner that solar panel is installed at off-premises station or top, house also becomes the research and development focus.But air-conditioning is comparatively limited service time, as enough sunlight and air conditioner standby or opening time not for a long time solar cell will be in full electric holding state, this is a kind of bigger waste to the solar-electricity Pooled resources.
Be necessary to consider solar energy-electric energy is fed back to civil power or other household electrical appliance for this reason, solve thus that civil power power consumption on daytime is big, the situation of electricity shortage.Publication number is that the patent of invention prospectus of CN102005975A has proposed a kind of solar airconditioning system and by its solar air-conditioner system of forming, can flow to civil power to unnecessary electric energy inversion after the electricity accumulating unit charging.But increased the electric power storage energy-storage units during owing to use solar energy, obviously strengthened the installation and the maintenance cost of system, how this patent does not specifically realize being specifically addressed to the photovoltaic inversion system yet simultaneously.
Summary of the invention
In view of this, the invention provides the solar photovoltaic interconnected inverter of a kind of DSP of employing control and use the solar energy frequency-conversion air-conditioning system of this inverter, wherein the major function of combining inverter is with the dc inverter one-tenth of the appended solar cell output of air-conditioning system and the alternating current of civil power homophase, and feedback civil power and for other household electrical appliance use of this family, particularly:
First purpose of the present invention is, a kind of solar photovoltaic interconnected inverter solution is provided, and to make full use of the electric energy that solar airconditioning produces, electric energy feedback that simultaneously will be unnecessary is incorporated utility grid into or for other household electrical appliance use.
Second purpose of the present invention is that a kind of solar energy convertible frequency air-conditioner solution of using above-mentioned combining inverter is provided.In this scheme, the electric energy that convertible frequency air-conditioner preferentially uses solar energy to produce, air-conditioning inserted civil power automatically when the electric energy that produces when solar energy was not enough, used needs to satisfy family.
For realizing first purpose of the present invention, technical scheme provided by the invention is: a kind of solar photovoltaic interconnected inverter, comprise power circuit and the control circuit that described power circuit is controlled, described power circuit comprises DC/DC unit, DC/AC unit and filter unit, described DC/DC unit is converted to high voltage direct current with the low-voltage DC of solar battery array output, described DC/AC unit is converted to the civil power alternating current with high voltage direct current, and described filter unit is connected between described DC/AC unit and the utility grid; Described control circuit comprises governor circuit and MPPT unit, described governor circuit is gathered numeral and/or analog signal from described power circuit, after finishing corresponding computing the power device in the described power circuit is controlled, the maximum power point of described MPPT unit dynamic tracing solar battery array, the working point of adjusting solar battery array.
More preferably, described governor circuit comprises DSP and peripheral circuit, input and modulate circuit, drive circuit and protective circuit, wherein: described input and modulate circuit are finished strong and weak electricity isolation, level conversion and signal and are amplified and filtering, to satisfy described DSP to each road signal level range and demand on signal quality; Described drive circuit realizes improving the effect of pulsed drive ability and isolation; When described protective circuit guarantees to break down, from hardware, directly block output pulse signal.
More preferably, described power circuit comprises the DClink unit, is connected between described DC/DC unit and the described DC/AC unit.
More preferably, described control circuit comprises the intermediate voltage detecting unit, is connected between described governor circuit and the described DClink unit.
More preferably, described control circuit comprises the IGBT driver element, is connected between described governor circuit and the described DC/AC unit.
More preferably, described control circuit comprises the synchronizing voltage detecting unit, detects the phase place of output voltage and utility grid voltage, with control output voltage and utility grid voltage homophase.
More preferably, described control circuit comprises the island effect detecting unit, stops to mains supply automatically when realizing main grid cut-off.
On this basis, for realizing second purpose of the present invention, technical scheme provided by the invention is: a kind of solar energy frequency-conversion air-conditioning system, comprise solar battery array, DC boosting module, above-mentioned solar photovoltaic interconnected inverter and DC frequency converting air-conditioner, described solar battery array, DC boosting module and DC frequency converting air-conditioner connect successively, described solar photovoltaic interconnected inverter is connected between described DC boosting module and the utility grid by photovoltaic combining inverter being inserted the DC boosting module, can gather unnecessary solar energy and feed back to utility grid.
More preferably, be connected with rectifier filter between utility grid and the described DC frequency converting air-conditioner.When system detects the solar electric power energy shortage, supply of electric power is provided behind rectification and smothing filtering, for the controller of DC frequency converting air-conditioner by the control civil power, to guarantee the normal use of direct current varied-frequency air conditioner.
More preferably, be connected with isolating diode between described DC boosting module and the described rectifier filter.Boost by microprocessor controls DC boosting module, make direct current varied-frequency air conditioner be operated in optimum state: the direct voltage after making its dc voltage a little more than the commercial power rectification when solar energy is enough guarantees the DC frequency converting air-conditioner 4 preferential solar energy that use; When solar power generation is not enough, automatically switch to civil power and drive, to guarantee the enough serviceabilitys of air-conditioning.
Compared with prior art, the invention provides solar energy and civil power duplicate supply frequency-conversion air-conditioning system, can solar energy and civil power drive operation of air conditioner jointly, solar energy is promptly got promptly with becoming a reality, greatly reduce production cost thus, allowing solar airconditioning come into ordinary family becomes possibility.When air-conditioning free time or solar energy have residue, but by also feedback utility grid of photovoltaic inversion system disclosed by the invention, not only energy savings is beneficial to environmental protection again.
Description of drawings
Fig. 1 is the composition frame chart of the grid-connected control system of application solar photovoltaic interconnected inverter of the present invention;
Fig. 2 is the composition frame chart of the solar energy frequency-conversion air-conditioning system of application photovoltaic combining inverter of the present invention.
Embodiment
In order to make those skilled in the art understand technical scheme of the present invention better, provide preferred embodiment below, and the present invention is described in further detail in conjunction with the accompanying drawings.
Embodiment 1
Referring to Fig. 1, a preferred embodiment of the grid-connected control system of solar photovoltaic interconnected inverter of the present invention is used in expression.Described solar photovoltaic interconnected inverter 2 is applied to the grid-connected control system of solar energy frequency-conversion air-conditioning system, comprise power circuit and the control circuit that power circuit is controlled, wherein: described power circuit comprises DC/DC unit 21, Dclink unit 22, DC/AC unit 23 and the filter unit 24 between solar battery array 1 and the utility grid 3; Described control circuit comprises with DSP being governor circuit 29, MPPT unit 25, intermediate voltage detecting unit 26, IGBT driver element 27 and the voltage synchronous detection unit 28 (output current and voltage synchronous detection unit) of core.Below respectively each parts is described.
The conversion of solar battery array 1 low-voltage DC that provides to high voltage direct current is provided in above-mentioned DC/DC unit 21, regulates the working point of solar battery array 1 simultaneously by MPPT unit 25, pursues the maximum power point of solar battery array 1 dynamically.
Above-mentioned DClink unit 22 is connected between DC/DC unit 21 and the DC/AC unit 23, can play effects such as current limliting or buffering.
The conversion of high voltage direct current to the civil power alternating current finished in above-mentioned DC/AC unit 23, makes output voltage and utility grid voltage same-phase simultaneously and keeps higher power factor.
Be connected with filter unit 24 between above-mentioned solar photovoltaic interconnected inverter 2 and the utility grid, prevent that inverter from producing interference to utility grid 3.
Above-mentioned governor circuit 29 is to be the control core circuit with master controller (DSP), can gather numeral and analog signal from power circuit, and carries out finishing after the corresponding computing control to power device, to realize the function of DC/DC and the energy conversion of DC/AC two-stage.
But above-mentioned MPPT unit 25 MPPT maximum power point tracking (Maximum Power Point Tracking, generating voltage that promptly can the detecting real-time solar panels, and tracking ceiling voltage current value VI, make system with the highest efficient to charge in batteries), realize the maximum power point of dynamic tracing solar battery array thus, regulate the working point of solar battery array.
More than solar photovoltaic inverter 2 is divided into power circuit and control circuit is described, in fact it is divided into front stage circuits and late-class circuit also can be analyzed easily, be summarized as follows:
Below further the grid-connected control system that is applied to solar photovoltaic inverter shown in Figure 1 is described.This system adopts the two-stage type design: prime is a boost chopper, and the back level is the full-bridge type inverter; Prime is used for maximum power tracing, and the back level realizes the control to grid-connected current, and control is all coordinated to finish by the DSP main control chip.
Particularly: prime DC/DC unit 21 is the Boost boost chopper, (because T/t off value is much larger than 1, output voltage is higher than supply voltage, so claim boost chopper, be also referred to as boost converter or Boost Converter), the low-voltage DC of solar cell output is transformed to high voltage direct current about 340V; The back level is the single-phase full bridge inverter circuit, obtains the alternating current of 220V/50Hz or 60Hz after the inversion.
Above-mentioned front stage circuits consists of: solar battery array 1, DC/DC unit 21, DCLink unit 22, intermediate voltage detecting unit 26, MPPT unit 25.
Above-mentioned late-class circuit consists of: DC/AC unit 23, IGBT driver element 27, voltage synchronous detection unit 28, filter unit 24.
Foregoing circuit is delivered to governor circuit 29 after finishing the voltage of intermediate voltage Vdc, urban network electricity pressure, grid-connected current and solar cell and current signal sampling.This governor circuit 29 mainly comprises DSP and peripheral circuit, input and modulate circuit, drive circuit and protective circuit, wherein: strong and weak electricity isolation, level conversion and functions such as signal amplification and filtering are mainly finished in input and conditioning unit, to satisfy the requirement of DSP control system to each road signal level range and signal quality; Drive circuit plays the driving force of raising pulse and the effect of isolation; When the virtual protection circuit then guaranteed to break down, system can directly block output pulse signal from hardware.
It should be noted that present embodiment is provided with MPPT unit 25 especially, the final purpose of its control is to pursue dynamically the maximum power point of solar panel.
In addition, island effect detecting unit (scheming not shown) is arranged also in the control circuit of said system,, make it have the island effect measuring ability by increasing the software design of anti-island effect.Like this, combining inverter stops automatically to utility grid 3 power supplies when main grid cut-off.
Embodiment 2
Referring to Fig. 2, a preferred embodiment of the solar energy frequency-conversion air-conditioning system of photovoltaic combining inverter of the present invention is used in expression, and it comprises solar battery array 1, DC boosting module 5, isolating diode 6, solar photovoltaic inverter 2, DC frequency converting air-conditioner 4.
In the scheme shown in Figure 2,, can gather unnecessary solar energy and feed back to utility grid 3 because above-mentioned photovoltaic combining inverter 2 connects DC boosting module 5.This scheme is subsidiary the photovoltaic grid-connected inversion control system, thereby can save the storage battery part, reduces the production and the maintenance cost of solar energy frequency-conversion air-conditioning system thus greatly.
Below further the operation principle and the course of work of solar energy frequency-conversion air-conditioning system shown in Figure 2 further described.
In the system, solar battery array 1 produces low-voltage DC, boosts to the 340V high voltage direct current through DC boosting module 5 as shown in Figure 2.This high voltage direct current directly inserts DC frequency converting air-conditioner 4 on the one hand and handles the running of rear drive convertible frequency air-conditioner through its built-in inverter; On the other hand, when DC frequency converting air-conditioner 4 was idle, this high voltage direct current was handled back feedback utility grid 3 by solar photovoltaic inverter 2, for other household electrical appliance use of user.
In the said system, be connected with rectifier filter 7 between utility grid 3 and the DC frequency converting air-conditioner 4, when the electric energy that produces when solar battery array 1 was not enough, the DC frequency converting air-conditioner 4 mains-supplied mode that can automatically switch was to guarantee the normal operation of air-conditioning.
Simultaneously, owing between DC boosting module 5 and rectifier filter 7, be connected to isolating diode 6, control the voltage of its output dc voltages after, guarantee that automatically the DC frequency converting air-conditioner system preferentially uses solar energy a little more than the commercial power rectification by solar photovoltaic inverter 2.
Solar energy can adopt the conventional solar cells plate by array 1 in this example, and a solar panel is exported usually and produced 15-42V, and 0-200W can adopt the use in parallel of polylith solar panel according to the load size.When system detects the solar electric power energy shortage, behind rectification and smothing filtering, provide supply of electric power by the control civil power, to guarantee the normal use of transducer air conditioning to DC variable frequency air conditioner controller.
Be pointed out that in passing solar photovoltaic inverter 2 can adopt a dsp chip jointly with the main control chip of DC frequency converting air-conditioner 4 in the said system, this not only guarantees the Total tune of system, also helps reducing production costs.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim institute restricted portion.For setting forth among each embodiment of the present invention, within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. solar photovoltaic interconnected inverter, comprise power circuit and the control circuit that described power circuit is controlled, it is characterized in that, described power circuit comprises DC/DC unit, DC/AC unit and filter unit, described DC/DC unit is converted to high voltage direct current with the low-voltage DC of solar battery array output, described DC/AC unit is converted to the civil power alternating current with high voltage direct current, and described filter unit is connected between described DC/AC unit and the utility grid; Described control circuit comprises governor circuit and MPPT unit, described governor circuit is gathered numeral and/or analog signal from described power circuit, after finishing corresponding computing the power device in the described power circuit is controlled, the maximum power point of described MPPT unit dynamic tracing solar battery array, the working point of adjusting solar battery array.
2. solar photovoltaic interconnected inverter as claimed in claim 1, it is characterized in that, described governor circuit comprises DSP and peripheral circuit, input and modulate circuit, drive circuit and protective circuit, wherein: described input and modulate circuit are finished strong and weak electricity isolation, level conversion and signal and are amplified and filtering, to satisfy described DSP to each road signal level range and demand on signal quality; Described drive circuit realizes improving the effect of pulsed drive ability and isolation; When described protective circuit guarantees to break down, from hardware, directly block output pulse signal.
3. solar photovoltaic interconnected inverter as claimed in claim 1 is characterized in that described power circuit comprises the DClink unit, is connected between described DC/DC unit and the described DC/AC unit.
4. solar photovoltaic interconnected inverter as claimed in claim 3 is characterized in that described control circuit comprises the intermediate voltage detecting unit, is connected between described governor circuit and the described DClink unit.
5. solar photovoltaic interconnected inverter as claimed in claim 1 is characterized in that described control circuit comprises the IGBT driver element, is connected between described governor circuit and the described DC/AC unit.
6. solar photovoltaic interconnected inverter as claimed in claim 1 is characterized in that described control circuit comprises the synchronizing voltage detecting unit, detects the phase place of output voltage and utility grid voltage, with control output voltage and utility grid voltage homophase.
7. as each described solar photovoltaic interconnected inverter of claim 1～6, it is characterized in that described control circuit comprises the island effect detecting unit, stop automatically powering when realizing main grid cut-off to utility grid.
8. solar energy frequency-conversion air-conditioning system, it is characterized in that, comprise solar battery array, DC boosting module, as claim 1～7 each described solar photovoltaic interconnected inverter and DC frequency converting air-conditioner, described solar battery array, DC boosting module and DC frequency converting air-conditioner connect successively, and described solar photovoltaic interconnected inverter is connected between described DC boosting module and the utility grid.
9. solar energy frequency-conversion air-conditioning system as claimed in claim 8 is characterized in that, is connected with rectifier filter between utility grid and the described DC frequency converting air-conditioner.
10. solar energy frequency-conversion air-conditioning system as claimed in claim 9 is characterized in that, is connected with isolating diode between described DC boosting module and the described rectifier filter.
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| CN2011102402528A CN102291026A (en) | 2011-08-19 | 2011-08-19 | Solar photovoltaic grid-connected inverter and solar convertible frequency air-conditioning system |
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Cited By (11)
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| CN104713176A (en) * | 2013-12-11 | 2015-06-17 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system and control method thereof |
| CN104734180A (en) * | 2013-12-24 | 2015-06-24 | 珠海格力电器股份有限公司 | Power supply control method and system |
| CN104728968A (en) * | 2013-12-24 | 2015-06-24 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system and control method thereof |
| CN105135569A (en) * | 2015-09-11 | 2015-12-09 | 广州华凌制冷设备有限公司 | Photovoltaic air conditioner system and control method thereof |
| CN105262134A (en) * | 2015-11-04 | 2016-01-20 | 珠海格力电器股份有限公司 | Household nano-network system and community-level microgrid system |
| WO2016026363A1 (en) * | 2014-08-18 | 2016-02-25 | 珠海格力电器股份有限公司 | Photovoltaic air conditioner and photovoltaic air conditioning system |
| CN106292828A (en) * | 2016-08-30 | 2017-01-04 | 天津理工大学 | A kind of photovoltaic system maximum power point tracking device and control method |
| CN106787097A (en) * | 2016-12-09 | 2017-05-31 | 康金沙 | A kind of solar airconditioning electric power system |
| CN108494267A (en) * | 2018-03-09 | 2018-09-04 | 长沙市航信电力科技有限公司 | A kind of efficient photovoltaic DC-to-AC converter and its control method |
| CN108494266A (en) * | 2018-03-09 | 2018-09-04 | 长沙市航信电力科技有限公司 | Photovoltaic combining inverter and its control method |
| CN109546684A (en) * | 2018-12-18 | 2019-03-29 | 辽宁恒顺新能源科技有限公司 | Micro-capacitance sensor power supply system |
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| CN104713176A (en) * | 2013-12-11 | 2015-06-17 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system and control method thereof |
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| CN105135569A (en) * | 2015-09-11 | 2015-12-09 | 广州华凌制冷设备有限公司 | Photovoltaic air conditioner system and control method thereof |
| CN105262134A (en) * | 2015-11-04 | 2016-01-20 | 珠海格力电器股份有限公司 | Household nano-network system and community-level microgrid system |
| CN106292828A (en) * | 2016-08-30 | 2017-01-04 | 天津理工大学 | A kind of photovoltaic system maximum power point tracking device and control method |
| CN106787097A (en) * | 2016-12-09 | 2017-05-31 | 康金沙 | A kind of solar airconditioning electric power system |
| CN108494267A (en) * | 2018-03-09 | 2018-09-04 | 长沙市航信电力科技有限公司 | A kind of efficient photovoltaic DC-to-AC converter and its control method |
| CN108494266A (en) * | 2018-03-09 | 2018-09-04 | 长沙市航信电力科技有限公司 | Photovoltaic combining inverter and its control method |
| CN109546684A (en) * | 2018-12-18 | 2019-03-29 | 辽宁恒顺新能源科技有限公司 | Micro-capacitance sensor power supply system |
| CN109546684B (en) * | 2018-12-18 | 2024-04-02 | 辽宁恒顺新能源科技有限公司 | Micro-grid power supply system |
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Application publication date: 20111221 |