CN102705944B - Solar frequency-conversion air-conditioning system - Google Patents
Solar frequency-conversion air-conditioning system Download PDFInfo
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- CN102705944B CN102705944B CN201210218407.2A CN201210218407A CN102705944B CN 102705944 B CN102705944 B CN 102705944B CN 201210218407 A CN201210218407 A CN 201210218407A CN 102705944 B CN102705944 B CN 102705944B
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Abstract
The invention provides a solar frequency-conversion air-conditioning system comprising a solar cell array, an air-conditioning frequency converter and a first DC bus, wherein DC generated by the solar cell array is transmitted into the air-conditioning frequency converter through the first DC bus; the air-conditioning frequency converter comprises a rectifying inverse grid-connected module, an inverse power module and a second DC bus, and the rectifying inverse grid-connected module is connected with the inverse power module through the second DC bus, the first DC bus and the second DC bus are parallelly connected, and the rectifying inverse grid-connected module can switch rectification and inverse grid-connection according to power supplied by the solar cell array and the power needed by an air-conditioning unit. The solar frequency-conversion air-conditioning system provided by the invention solves the problem that the traditional system has deficiencies in back feeding electric energy to a mains supply grid and also reduces the volume of the solar frequency-conversion air-conditioning system and lowers the installation and maintenance cost.
Description
Technical field
The present invention relates to power electronics and household electrical appliance technical field, more particularly, relate to a kind of solar energy frequency-conversion air-conditioning system.
Background technology
Along with photovoltaic power generation technology development, photovoltaic air-conditioning is developed rapidly as a kind of application form of solar energy power generating, wherein particularly evident with solar energy convertible frequency air-conditioner.Fig. 1 is the structural representation of a kind of solar energy frequency-conversion air-conditioning system in prior art, and this solar energy frequency-conversion air-conditioning system comprises: solar battery array, DC boosting module, photovoltaic combining inverter, diode, rectifier filter and DC frequency converting air-conditioner.Its operation principle is as follows: when DC frequency converting air-conditioner is worked, the low-voltage DC that solar battery array produces accesses in DC frequency converting air-conditioner after DC boosting module is boosted, and through the built-in inverter of DC frequency converting air-conditioner, processes the work of rear drive air-conditioning unit; When DC frequency converting air-conditioner is idle, the direct current after DC boosting module is boosted, after photovoltaic combining inverter is processed, is fed back to utility grid; When the electric energy producing when solar battery array is not enough to provide DC frequency converting air-conditioner work, DC frequency converting air-conditioner is by the mains-supplied after rectifier filter is processed, in Fig. 1 arrow represent energy flow to.
Inventor finds in realizing process of the present invention: the electric energy that existing solar energy frequency-conversion air-conditioning system is fed back to utility grid provides by photovoltaic combining inverter, the electric energy providing when solar battery array is greater than DC frequency converting air-conditioner and takes, the unnecessary electric energy that solar battery array provides also cannot be fed back to electrical network, and existing solar energy frequency-conversion air-conditioning system is to the mode Shortcomings of utility grid feedback electric energy; The simultaneously use of photovoltaic combining inverter makes that the volume of solar energy frequency-conversion air-conditioning system is large, installation and maintenance cost is higher.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of solar energy frequency-conversion air-conditioning system, to solve existing solar energy frequency-conversion air-conditioning system to the mode Shortcomings of utility grid feedback electric energy, and due to the problem that volume is large, installation and maintenance cost is higher of the solar energy frequency-conversion air-conditioning system that adopts photovoltaic combining inverter to cause.
For achieving the above object, the embodiment of the present invention provides following technical scheme.
A solar energy frequency-conversion air-conditioning system, comprising: solar battery array, and air conditioning frequency converter and the first dc bus, the direct current that described solar battery array produces is conveyed into described air conditioning frequency converter by described the first dc bus;
Described air conditioning frequency converter comprises: the grid-connected module of commutation inversion, inverted power module and the second dc bus, the grid-connected module of described commutation inversion is connected by described the second dc bus with described inverted power module, and described the first dc bus and described the second dc bus are connected in parallel;
Wherein, the grid-connected module of described commutation inversion, while being less than air-conditioning unit power demand for the power providing at described solar battery array, the alternating current of utility network is converted into after direct current, flow to described inverted power module, when the power providing at described solar battery array is greater than described air-conditioning unit power demand, the unnecessary direct current that described solar battery array is provided is converted into after alternating current, flow to utility network, when described air-conditioning unit is idle, the direct current that described solar battery array is provided is converted into after alternating current, flow to utility network,
Described inverted power module, while being less than described air-conditioning unit power demand for the power providing at described solar battery array, the direct current that the direct current that described solar battery array is provided and the grid-connected module of described commutation inversion provide is converted into after alternating current, drive the work of described air-conditioning unit, when the power providing at described solar battery array is more than or equal to described air-conditioning unit power demand, the direct current corresponding with described air-conditioning unit power demand that described solar battery array is provided is converted into alternating current, drives the work of described air-conditioning unit.
Optionally, the grid-connected module of described commutation inversion comprises: commutation inversion parallel network circuit and control circuit;
The duty of described commutation inversion parallel network circuit comprises: AC/DC rectification duty and DC/AC inversion grid connection duty, described commutation inversion parallel network circuit is when AC/DC rectification duty, the alternating current of utility network is converted into direct current, flow to described inverted power module, described commutation inversion parallel network circuit is when DC/AC inversion grid connection duty, the direct current that described solar battery array is provided is converted into alternating current, flows to utility network;
Described control circuit is connected with described commutation inversion parallel network circuit, while being less than described air-conditioning unit power demand for the power providing at described solar battery array, control described commutation inversion parallel network circuit in AC/DC rectification duty, when the power providing at described solar battery array is greater than described air-conditioning unit power demand, control described commutation inversion parallel network circuit in DC/AC inversion grid connection duty, so that the unnecessary direct current that described commutation inversion parallel network circuit provides described solar battery array is converted into alternating current, flow to utility network, when described air-conditioning unit is idle, control described commutation inversion parallel network circuit in DC/AC inversion grid connection duty.
Optionally, the grid-connected module of described commutation inversion also comprises: MPPT maximum power point tracking MPPT circuit;
Described MPPT circuit, for following the tracks of the MPPT output of controlling described solar battery array, so that described solar battery array always works in the state of maximum power output.
Optionally, described system also comprises: DC/DC voltage changing module;
Described DC/DC voltage changing module, for galvanic voltage-regulation that described solar battery array is produced to preset range;
The direct current that described solar battery array produces, after described DC/DC voltage changing module regulates, is conveyed into described air conditioning frequency converter by described the first dc bus;
Described DC/DC voltage changing module also comprises:
MPPT circuit, for following the tracks of the MPPT output of controlling described solar battery array, so that described solar battery array always works in the state of maximum power output.
Optionally, described system also comprises: photovoltaic conflux module;
After the direct current that described solar battery array produces confluxes in described photovoltaic conflux module, through described DC/DC voltage changing module, regulate, by described the first dc bus, be conveyed into described air conditioning frequency converter.
Optionally, described system also comprises: power supply unit;
Direct current after described photovoltaic conflux module is confluxed after distribution, regulates through described DC/DC voltage changing module in described power supply unit, by described the first dc bus, is conveyed into described air conditioning frequency converter.
Optionally, described system also comprises: power supply unit;
The direct current that described solar battery array produces after distribution, regulates through described DC/DC voltage changing module in described power supply unit, by described the first dc bus, is conveyed into described air conditioning frequency converter.
Optionally, described system also comprises: photovoltaic conflux module;
After the direct current that described solar battery array produces confluxes in described photovoltaic conflux module, by described the first dc bus, be conveyed into described air conditioning frequency converter.
Optionally, described system also comprises: power supply unit;
Direct current after described photovoltaic conflux module is confluxed after distribution, is conveyed into described air conditioning frequency converter by described the first dc bus in described power supply unit.
Optionally, described system also comprises: power supply unit;
The direct current that described solar battery array produces after distribution, is conveyed into described air conditioning frequency converter by described the first dc bus in described power supply unit.
Based on technique scheme, the power that the grid-connected module of commutation inversion of the air conditioning frequency converter of the solar energy frequency-conversion air-conditioning system that the embodiment of the present invention provides can provide according to solar battery array and the situation of air-conditioning unit power demand, the alternating current that carries out utility network is converted into galvanic rectification, the direct current providing with solar battery array is converted into the switching of the inversion grid connection of alternating current, when the power that makes to provide at solar battery array is greater than described air-conditioning unit power demand, after being converted into alternating current, the unnecessary direct current that the grid-connected module of commutation inversion can provide described solar battery array flows to utility network, solved existing solar energy frequency-conversion air-conditioning system to the problem of the mode Shortcomings of utility grid feedback electric energy, the solar energy frequency-conversion air-conditioning system that the embodiment of the present invention provides simultaneously does not adopt photovoltaic combining inverter, just on air conditioning frequency converter, improves, and has reduced the volume of solar energy frequency-conversion air-conditioning system, has reduced installation and maintenance cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of solar energy frequency-conversion air-conditioning system in prior art;
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 2 provides for the embodiment of the present invention one;
The energy flow graph of the solar energy frequency-conversion air-conditioning system that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the grid-connected module of commutation inversion that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 5 provides for the embodiment of the present invention two;
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 6 provides for the embodiment of the present invention three;
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 7 provides for the embodiment of the present invention four;
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 8 embodiment of the present invention five provides;
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 9 provides for the embodiment of the present invention six;
The structural representation of the solar energy frequency-conversion air-conditioning system that Figure 10 provides for the embodiment of the present invention seven;
The structural representation of the solar energy frequency-conversion air-conditioning system that Figure 11 provides for the embodiment of the present invention eight.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 2 provides for the embodiment of the present invention one, the energy flow graph of the solar energy frequency-conversion air-conditioning system that Fig. 3 provides for the embodiment of the present invention, solar energy convertible frequency air-conditioner shown in the present can be solar energy photovoltaic direct current convertible frequency air-conditioner, shown in Fig. 2 and Fig. 3, in Fig. 2, add thick lines and represent dc bus, in Fig. 3, arrow points represents power flow, this solar energy frequency-conversion air-conditioning system can comprise: solar battery array 100, the air conditioning frequency converter 200 of solar energy convertible frequency air-conditioner and the first dc bus 300, solar battery array 100 is connected with air conditioning frequency converter 200 by the first dc bus 300, the direct current that solar battery array 100 produces is conveyed into air conditioning frequency converter 200 by the first dc bus 300, Fig. 2 also shows the internal structure of air conditioning frequency converter 200 simultaneously, air conditioning frequency converter 200 can comprise: the grid-connected module 210 of commutation inversion, inverted power module 220 and the second dc bus 230, the grid-connected module 210 of commutation inversion is joined with inverted power module 220 by the second dc bus 230, the first dc bus 300 and the second dc bus 230 are connected in parallel.
The air conditioning frequency converter of the DC frequency converting air-conditioner shown in the embodiment of the present invention is arranged between the air-conditioning unit of utility network and convertible frequency air-conditioner, concrete, the grid-connected module 210 of commutation inversion is external in utility network, utility network can be utility network between utility grid or enterprise, family, community etc., the air-conditioning unit of the external solar energy convertible frequency air-conditioner of inverted power module 220, the parts that embodiment of the present invention indication air-conditioning unit can need to be powered for compressor of air conditioner of solar energy convertible frequency air-conditioner etc.
Optionally, the air conditioning frequency converter that the embodiment of the present invention provides can be two level converters or three-level converter.
The power that the grid-connected module 210 of commutation inversion that the embodiment of the present invention provides can provide according to solar battery array 100 and the situation of air-conditioning unit power demand, carry out the alternating current of utility network to galvanic conversion, realize rectification function, so that inverted power module is powered, also can carry out direct current that solar battery array 100 provides to the conversion of alternating current, realize inversion grid connection function, with to utility network feedback electric energy, detailed process is as follows:
When the power providing when solar battery array 100 is less than air-conditioning unit power demand, the grid-connected module 210 of commutation inversion is obtained alternating current from external utility network, the alternating current obtaining is converted into after direct current, flows to inverted power module 220, supply air-conditioning unit institute short of electricity amount;
When the power providing when solar battery array 100 is greater than air-conditioning unit power demand, the unnecessary direct current that the grid-connected module 210 of commutation inversion provides solar battery array 100 is converted into after alternating current, flow to utility network, the direct current that the unnecessary direct current that solar battery array 100 provides provides for solar battery array 100 is in the situation that meeting air-conditioning unit power demand, remaining direct current, specifically can be formulated as: the required direct current of direct current-air-conditioning unit that unnecessary direct current=solar battery array 100 that solar battery array 100 provides provides,
When the power providing when solar battery array 100 equals air-conditioning unit power demand, the grid-connected module 210 of commutation inversion is not worked;
Idle when air-conditioning unit, when not in running order, all direct currents that the grid-connected module 210 of commutation inversion provides solar battery array 100 are converted into alternating current, flow to utility network.
In these cases, the inverted power module 220 that the embodiment of the present invention provides also has corresponding workflow:
When the power providing when solar battery array 100 is less than air-conditioning unit power demand, the direct current that the grid-connected module 210 of the direct current that inverted power module 220 provides solar battery array 100 and commutation inversion provides is converted into alternating current, drives the work of air-conditioning unit;
When the power providing when solar battery array 100 is more than or equal to air-conditioning unit power demand, solar battery array 100 direct current corresponding with air-conditioning unit power demand that provide is converted into alternating current, drives the work of air-conditioning unit; Concrete, when the power providing when solar battery array 100 is greater than air-conditioning unit power demand, the galvanic part that solar battery array 100 provides will offer inverted power module 220, another part will flow to utility network by the grid-connected module 210 of commutation inversion, and the direct current that solar battery array 100 offers inverted power module 220 should be able to meet the required power of air-conditioning unit; When the power providing when solar battery array 100 equals air-conditioning unit power demand, the direct current that solar battery array 100 provides will all offer inverted power module 220, so that inverted power module 220 can drive air-conditioning unit;
Idle when air-conditioning unit, when not in running order, inverted power module 220 will quit work.
Preferably, the grid-connected module 210 of commutation inversion that the embodiment of the present invention provides is for having the four quadrant convertor of rectification and inversion grid connection function, also be chosen as the PWM(PulseWidth Modulation with rectification and inversion grid connection function, pulse width modulation) rectifier; Inverted power module 220 can be DC(DirectCurrent, direct current)/AC(Alternating Current, exchange) inverter.
It should be noted that, the rectification of the grid-connected module 210 of commutation inversion and the switching between inversion grid connection can be carried out according to energy management algorithm and rectification control algolithm, the energy flow that energy management algorithm is controlled utility network and solar battery array 100 to, it is in rectification state or inversion grid connection state that rectification control algolithm is controlled the grid-connected module 210 of commutation inversion; The grid-connected module 210 of the commutation inversion of take as PWM rectifier be example, the energy flow that PWM rectifier can be controlled utility network and solar battery array 100 according to energy management algorithm to, according to PWM rectifier control algolithm, determine that PWM rectifier is in rectification state or inversion grid connection state.
For the structure of the grid-connected module 210 of commutation inversion that the embodiment of the present invention is provided more clear, below the concrete structure of the grid-connected module 210 of commutation inversion is described, it should be noted that, the concrete structure of the grid-connected module 210 of commutation inversion described below is only optional mode, principle according to the grid-connected module 210 of the disclosed commutation inversion of the embodiment of the present invention, those skilled in the art can be equal to and replace or conversion following concrete structure, this is equal to the concrete structure of replacing or converting the drawn grid-connected module of commutation inversion, also should belong to the protection domain of the embodiment of the present invention.
The structural representation of the grid-connected module of commutation inversion that Fig. 4 provides for the embodiment of the present invention, with reference to Fig. 4, the grid-connected module 210 of commutation inversion can comprise: can realize the commutation inversion parallel network circuit 2101 of AC/DC rectification and DC/AC inversion grid connection, and control circuit 2102;
When commutation inversion parallel network circuit 2101 is operated in AC/DC rectification state, the alternating current of utility network is converted into direct current, flows to inverted power module 220;
When commutation inversion parallel network circuit 2101 is operated in DC/AC inversion grid connection state, the direct current that solar battery array 100 is provided is converted into alternating current, flows to utility network;
Control circuit 2102 is connected with commutation inversion parallel network circuit 2101, while being less than air-conditioning unit power demand for the power providing at solar battery array 100, control commutation inversion parallel network circuit 2101 in AC/DC rectification duty, so that commutation inversion parallel network circuit 2101 is converted into the alternating current of utility network after direct current, flow to inverted power module 220, when the power providing at solar battery array 100 is greater than air-conditioning unit power demand, control commutation inversion parallel network circuit 2101 in DC/AC inversion grid connection duty, so that the unnecessary direct current that solar battery array 100 provides is converted into after alternating current, flow to utility network, when air-conditioning unit is idle, control commutation inversion parallel network circuit 2101 in DC/AC inversion grid connection duty, so that the direct current that solar battery array 100 provides is converted into after alternating current, flow to utility network.
Concrete, control circuit 2102 can be realized the switching controls of commutation inversion parallel network circuit 2101 between AC/DC rectification and DC/AC inversion grid connection duty according to energy management algorithm and rectification control algolithm.
Optionally, the grid-connected module 210 of commutation inversion can also comprise: MPPT(Maximum Power PointTracking, MPPT maximum power point tracking) circuit (not shown), for following the tracks of the MPPT output of controlling solar battery array 100, so that solar battery array 100 always works in maximum power output.
Concrete, MPPT circuit can be realized according to MPPT algorithm the tracking control of the MPPT output of solar battery array 100; Optionally, the output voltage that MPPT circuit can be controlled the first dc bus 300 regulates in preset range, to guarantee the MPPT output of solar battery array 100.
It should be noted that, MPPT circuit not necessarily will be arranged in the grid-connected module of commutation inversion with structure shown in Fig. 4.
The power that embodiment of the present invention solar battery array 100 provides specifically can pass through to detect DC voltage and the electric current of the first dc bus 300, thereby obtains the power that solar battery array 100 provides; The power required for air-conditioning unit determines by the current operating mode of convertible frequency air-conditioner, and the concrete detection mode of the power that the power that the embodiment of the present invention provides for solar battery array 100 and air-conditioning unit are required is not limited.
The power that the grid-connected module of commutation inversion of the air conditioning frequency converter of solar energy frequency-conversion air-conditioning system can provide according to solar battery array and the situation of air-conditioning unit power demand, carry out the alternating current of utility network to galvanic rectification, the direct current providing with solar battery array is to the switching of the inversion grid connection of alternating current, when the power that makes to provide at solar battery array is greater than described air-conditioning unit power demand, after being converted into alternating current, the unnecessary direct current that the grid-connected module of commutation inversion can provide described solar battery array flows to utility network, solved existing solar energy frequency-conversion air-conditioning system to the problem of the mode Shortcomings of utility grid feedback electric energy, the solar energy frequency-conversion air-conditioning system that the embodiment of the present invention provides simultaneously does not adopt photovoltaic combining inverter, just on air conditioning frequency converter, improves, and has reduced the volume of solar energy frequency-conversion air-conditioning system, has reduced installation and maintenance cost.
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 5 provides for the embodiment of the present invention two, shown in Fig. 2 and Fig. 5, the frequency-conversion air-conditioning system of solar energy shown in Fig. 5 is compared with system shown in Figure 2, and system shown in Figure 5 also comprises: DC/DC voltage changing module 400;
DC/DC voltage changing module 400 for galvanic voltage-regulation that solar battery array 100 is produced to preset range.
The low-voltage direct that DC/DC voltage changing module 400 mainly produces solar battery array 100 processing of boosting, makes the voltage that is conveyed into frequency converter 200 can reach preset range.
Optionally, DC/DC voltage changing module 400 can also arrange MPPT circuit, realizes the tracking of the MPPT output of solar battery array 100 control by MPPT algorithm.Optionally, the galvanic voltage-regulation that DC/DC voltage changing module 400 can be by producing solar battery array 100, the power output of solar battery array 100 is maximized, realize the MPPT output of solar battery array 100.
Optionally, DC/DC voltage changing module 400 can be by IGBT(Insulated Gate BipolarTransistor, insulated gate bipolar transistor), MOSFET(Metal-Oxide-SemiconductorField-Effect Transistor, metal-oxide layer-semiconductor-field-effect transistor), IGCT(IntergratedGate Commutated Thyristors, integrated gate commutated thyristor), IGCT constant power semiconductor devices realizes direct current transformation function.
Optionally, DC/DC voltage changing module 400 can be arranged between solar battery array 100 and air conditioning frequency converter 200.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention two can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 6 provides for the embodiment of the present invention three, shown in Fig. 5 and Fig. 6, system shown in Figure 6 is compared with system shown in Figure 5, and system shown in Figure 6 also comprises: photovoltaic conflux module 500.
After the direct current that solar battery array 100 produces confluxes in photovoltaic conflux module 500, after DC/DC voltage changing module 400 regulates, by the first dc bus 300, be conveyed into air conditioning frequency converter 200.
The embodiment of the present invention three is applicable to need to carry out on a large scale the solar battery array of photovoltaic conflux.
Optionally, photovoltaic conflux module 500 can be photovoltaic combiner box, and photovoltaic conflux module 500 can be arranged between solar battery array 100 and DC/DC voltage changing module 400.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention three can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 7 provides for the embodiment of the present invention four, shown in Fig. 5 and Fig. 7, system shown in Figure 7 is compared with system shown in Figure 5, and system also comprises described in Fig. 7: power supply unit 600.
The direct current that solar battery array 100 produces, after the interior distribution of power supply unit 600, after DC/DC voltage changing module 400 regulates, is conveyed into air conditioning frequency converter 200 by the first dc bus 300.
Optionally, power supply unit 600 is arranged between solar battery array 100 and DC/DC voltage changing module 400.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention four can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 8 provides for the embodiment of the present invention five, shown in Fig. 6 and Fig. 8, system shown in Figure 6 is compared with system shown in Figure 8, and system also comprises described in Fig. 8: power supply unit 600.
Direct current after photovoltaic conflux module 500 is confluxed, after the interior distribution of power supply unit 600, after DC/DC voltage changing module 400 regulates, is conveyed into air conditioning frequency converter 200 by the first dc bus 300.
Optionally, power supply unit 600 is arranged between photovoltaic conflux module 500 and DC/DC voltage changing module 400.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention five can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
The structural representation of the solar energy frequency-conversion air-conditioning system that Fig. 9 provides for the embodiment of the present invention six, shown in Fig. 2 and Fig. 9, system shown in Figure 9 is compared with system shown in Figure 2, also comprises: photovoltaic conflux module 500.
After the direct current that solar battery array 100 produces confluxes in photovoltaic conflux module 500, by the first dc bus 300, be conveyed into air conditioning frequency converter 200.
Optionally, photovoltaic conflux module 500 can be photovoltaic combiner box, and photovoltaic conflux module 500 can be arranged between solar battery array 100 and air conditioning frequency converter 200.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention six can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
The structural representation of the solar energy frequency-conversion air-conditioning system that Figure 10 provides for the embodiment of the present invention seven, shown in Fig. 2 and Figure 10, system shown in Figure 10 is compared with system shown in Figure 2, also comprises: power supply unit 600.
The direct current that solar battery array 100 produces, after the interior distribution of power supply unit 600, is conveyed into air conditioning frequency converter 200 by the first dc bus 300.
Optionally, power supply unit 600 can be arranged between solar battery array 100 and air conditioning frequency converter 200.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention seven can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
The structural representation of the solar energy frequency-conversion air-conditioning system that Figure 11 provides for the embodiment of the present invention eight, shown in Fig. 9 and Figure 11, system shown in Figure 11 is compared with system shown in Figure 9, also comprises: power supply unit 600.
Direct current after photovoltaic conflux module 500 is confluxed, after the interior distribution of power supply unit 600, is conveyed into air conditioning frequency converter 200 by the first dc bus 300.
Optionally, power supply unit 600 can be arranged between photovoltaic conflux module 500 and air conditioning frequency converter 200.
Optionally, the concrete structure of the grid-connected module 210 of commutation inversion shown in the embodiment of the present invention eight can be as shown in Figure 4; Optionally, the grid-connected module 210 of commutation inversion can be provided with MPPT circuit.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a solar energy frequency-conversion air-conditioning system, is characterized in that, comprising: solar battery array, and air conditioning frequency converter and the first dc bus, the direct current that described solar battery array produces is conveyed into described air conditioning frequency converter by described the first dc bus;
Described air conditioning frequency converter comprises: the grid-connected module of commutation inversion, inverted power module and the second dc bus, the grid-connected module of described commutation inversion is connected by described the second dc bus with described inverted power module, and described the first dc bus and described the second dc bus are connected in parallel;
Wherein, the grid-connected module of described commutation inversion, while being less than air-conditioning unit power demand for the power providing at described solar battery array, the alternating current of utility network is converted into after direct current, flow to described inverted power module, realize rectification function, when the power providing at described solar battery array is greater than described air-conditioning unit power demand, the unnecessary direct current that described solar battery array is provided is converted into after alternating current, flow to utility network, when described air-conditioning unit is idle, the direct current that described solar battery array is provided is converted into after alternating current, flow to utility network, realize inversion grid connection function,
Described inverted power module, while being less than described air-conditioning unit power demand for the power providing at described solar battery array, the direct current that the direct current that described solar battery array is provided and the grid-connected module of described commutation inversion provide is converted into after alternating current, drive the work of described air-conditioning unit, when the power providing at described solar battery array is more than or equal to described air-conditioning unit power demand, the direct current corresponding with described air-conditioning unit power demand that described solar battery array is provided is converted into alternating current, drives the work of described air-conditioning unit.
2. solar energy frequency-conversion air-conditioning system according to claim 1, is characterized in that, the grid-connected module of described commutation inversion comprises: commutation inversion parallel network circuit and control circuit;
The duty of described commutation inversion parallel network circuit comprises: AC/DC rectification duty and DC/AC inversion grid connection duty, described commutation inversion parallel network circuit is when AC/DC rectification duty, the alternating current of utility network is converted into direct current, flow to described inverted power module, described commutation inversion parallel network circuit is when DC/AC inversion grid connection duty, the direct current that described solar battery array is provided is converted into alternating current, flows to utility network;
Described control circuit is connected with described commutation inversion parallel network circuit, while being less than described air-conditioning unit power demand for the power providing at described solar battery array, control described commutation inversion parallel network circuit in AC/DC rectification duty, when the power providing at described solar battery array is greater than described air-conditioning unit power demand, control described commutation inversion parallel network circuit in DC/AC inversion grid connection duty, so that the unnecessary direct current that described commutation inversion parallel network circuit provides described solar battery array is converted into alternating current, flow to utility network, when described air-conditioning unit is idle, control described commutation inversion parallel network circuit in DC/AC inversion grid connection duty.
3. solar energy frequency-conversion air-conditioning system according to claim 2, is characterized in that, the grid-connected module of described commutation inversion also comprises: MPPT maximum power point tracking MPPT circuit;
Described MPPT circuit, for following the tracks of the MPPT output of controlling described solar battery array, so that described solar battery array always works in the state of maximum power output.
4. according to the solar energy frequency-conversion air-conditioning system described in claims 1 to 3 any one, it is characterized in that, also comprise: DC/DC voltage changing module;
Described DC/DC voltage changing module, for galvanic voltage-regulation that described solar battery array is produced to preset range;
The direct current that described solar battery array produces, after described DC/DC voltage changing module regulates, is conveyed into described air conditioning frequency converter by described the first dc bus;
Described DC/DC voltage changing module also comprises:
MPPT circuit, for following the tracks of the MPPT output of controlling described solar battery array, so that described solar battery array always works in the state of maximum power output.
5. solar energy frequency-conversion air-conditioning system according to claim 4, is characterized in that, also comprises: photovoltaic conflux module;
After the direct current that described solar battery array produces confluxes in described photovoltaic conflux module, through described DC/DC voltage changing module, regulate, by described the first dc bus, be conveyed into described air conditioning frequency converter.
6. solar energy frequency-conversion air-conditioning system according to claim 5, is characterized in that, also comprises: power supply unit;
Direct current after described photovoltaic conflux module is confluxed after distribution, regulates through described DC/DC voltage changing module in described power supply unit, by described the first dc bus, is conveyed into described air conditioning frequency converter.
7. solar energy frequency-conversion air-conditioning system according to claim 4, is characterized in that, also comprises: power supply unit;
The direct current that described solar battery array produces after distribution, regulates through described DC/DC voltage changing module in described power supply unit, by described the first dc bus, is conveyed into described air conditioning frequency converter.
8. according to the solar energy frequency-conversion air-conditioning system described in claims 1 to 3 any one, it is characterized in that, also comprise: photovoltaic conflux module;
After the direct current that described solar battery array produces confluxes in described photovoltaic conflux module, by described the first dc bus, be conveyed into described air conditioning frequency converter.
9. solar energy frequency-conversion air-conditioning system according to claim 8, is characterized in that, also comprises: power supply unit;
Direct current after described photovoltaic conflux module is confluxed after distribution, is conveyed into described air conditioning frequency converter by described the first dc bus in described power supply unit.
10. according to the solar energy frequency-conversion air-conditioning system described in claims 1 to 3 any one, it is characterized in that, also comprise: power supply unit;
The direct current that described solar battery array produces after distribution, is conveyed into described air conditioning frequency converter by described the first dc bus in described power supply unit.
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