CN202880967U - Photovoltaic seawater desalination system and photovoltaic seawater desalination inverter - Google Patents

Abstract

The utility model relates to a photovoltaic seawater desalination system, and the system comprises a photovoltaic power generation module and a seawater desalination module, wherein the photovoltaic power generation module comprises a photovoltaic array and a photovoltaic seawater desalination inverter; the photovoltaic array is used for transforming optical energy into direct-current power and outputting the power; and photovoltaic seawater desalination inverter is connected between the photovoltaic array and the seawater desalination module and used for receiving the direct-current power and outputting the inverted direct-current power to the seawater desalination module for power supply. The utility model further correspondingly provides a photovoltaic seawater desalination inverter. According to the utility model, the photovoltaic seawater desalination inverter helps to directly invert the direct-current power output by the photovoltaic array to a device to be supplied with power in the seawater desalination module, so that a storage battery of the system is successfully saved, thereby not only increasing the reliability of the device of the system but also greatly reducing the construction cost and maintenance cost of the system.

Description

A kind of photovoltaic seawater desalination system and photovoltaic sea water desaltination invertor

Technical field

The utility model relates to field of photovoltaic power generation, more particularly, relates to a kind of photovoltaic seawater desalination system and photovoltaic sea water desaltination invertor.

Background technology

Fresh water is one of human society base substance of depending on for existence and development, but along with industrial sustained and rapid development, industrial water consumption is increasing, and shortage of water resources has become the important factor of restriction China's economy and social development.In order to increase the supply of fresh water, except the measure of routine, outside diversion nearby or interbasin water diversion, a favourable approach is exactly to carry out seawater or desalination nearby.Consider from the economy aspect, with long traditional method apart from supplying water, the method that adopts desalination technology to solve water supply is specially adapted to the remote districts that island, coastland and water consumption are disperseed relatively.

Sun power be use not to the utmost, inexhaustible renewable energy source, clean nontoxic and non-environmental-pollution, and the area of lack of water arid often all is the abundant area of solar energy resources; In solar radiation strong season, it it also just in time is maximum season of demand fresh water.Therefore, the concrete characteristics of sun power are combined closely with conventional modern desalination technology, realize having complementary advantages, greatly improve the economy of solar seawater desalination system, be with a wide range of applications, the desalination with Solar Energy that also can further promote China advances.

China starts from the eighties in last century to the research of desalination with Solar Energy, but mainly concentrates on the thermal utilization field, and common solar seawater desalination system is take distillation method as main, and is comparatively ripe, also discloses many china national practical new-type patent applications.But exist as employing natural convection, thermo-efficiency is not high; Water vapour is not fully utilized, and causes some problems such as power loss.And utilize sea water desaltination utilisation technology that photovoltaic array converts solar energy into electrical energy also seldom, also not commercialization.Application number is that 200720069563.1 Chinese utility model patent and application number are that 200810071554.5 utility model patent all discloses the photovoltaic seawater desalination system that a class is utilized photovoltaic power generation technology and Reverse-osmosis Seawater Desalination Technology combination, the described technology of this patent also is the representative of prior art, but all exists two problems that this technology can not be promoted and commercialization.First problem is that this system exists energy storage device---store battery.The store battery of using in electric utility at present adopts lead acid cell more, and work-ing life is many between 1 to 3 year.In seawater desalination system, introduce too much store battery, both greatly increased input cost and the maintenance cost of system, owing to affected by the high salt spray character of island, coastland, can greatly reduce the life-span of store battery and the reliability of system again.Another problem be prior art be by charge controller with the energy storage of photovoltaic array output in store battery, by invertor the direct current of store battery is converted into water pump in the alternating-current drive system again.On the one hand, invertor is adopted and is 50Hz power frequency invertor, when driving lift pump, high-pressure pump, can deposit the situation (7 times of 5 –) that starting current is far longer than the water pump rated current, the work-ing life that can reduce cable, water pump winding, store battery, invertor; On the other hand, because through overcharging, discharge, boost and the multiple energy transformation such as inversion, the efficient of system can reduce greatly, affects the economy of system.Simultaneously, these two patented technologies all do not have fully to disclose the control process of lift pump, high-pressure pump in the principle of work of controller, invertor and the photovoltaic seawater desalination system.

The utility model content

The technical problems to be solved in the utility model is, need to adopt store battery to affect the defective of work-ing life and system efficiency for existing photovoltaic seawater desalination system, and a kind of photovoltaic seawater desalination system and photovoltaic sea water desaltination invertor that does not adopt store battery is provided.

The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of photovoltaic seawater desalination system, comprise photovoltaic generating module and sea water desaltination module; Described photovoltaic generating module comprises photovoltaic array and photovoltaic sea water desaltination invertor; The direct current that described photovoltaic array is used for luminous energy is changed into is exported; Described photovoltaic sea water desaltination invertor is connected to described photovoltaic array) and the sea water desaltination module between, be used for receiving direct current that described photovoltaic array exports and with exporting to described sea water desaltination module for alternating-current and power after the inversion.

In according to photovoltaic seawater desalination system described in the utility model, described sea water desaltination module comprises lift pump, pre-processing assembly, high-pressure pump and the reverse osmosis module that connects successively at least; Described lift pump is used for that seawater is extracted into described pre-processing assembly from the water source and carries out pre-treatment; Described high-pressure pump is used for carrying out the reverse osmosis desalination processing with being delivered to described reverse osmosis module after the pretreated seawater pressurization; Described photovoltaic sea water desaltination invertor further comprises the first sub-invertor and the second sub-invertor;

The described first sub-invertor is connected between described photovoltaic array and the lift pump, is used for dc inverter with described photovoltaic array and is alternating-current and export to described lift pump and power; The described second sub-invertor is connected between described photovoltaic array and the high-pressure pump, is used for dc inverter with described photovoltaic array and is alternating-current and export to described high-pressure pump and power.

In according to photovoltaic seawater desalination system described in the utility model, the described first sub-invertor is connected with the described second sub-invertor communication; The described first sub-invertor links to each other with described lift pump, and the alternating-current that inversion goes out after being used for starting shooting sends to described lift pump; The described first sub-invertor also sends in when shutdown and stops inverter signal and cut out high-pressure pump to the described second sub-invertor, and the described first sub-invertor stops to send alternating-current to described lift pump again; The described second sub-invertor links to each other with described high-pressure pump, and the alternating-current of inversion sends to described high-pressure pump after being used for starting shooting; The described second sub-invertor also stops to send alternating-current to described high-pressure pump in when shutdown, sends to stop inverter signal and close lift pump to the described first sub-invertor again.

In according to photovoltaic seawater desalination system described in the utility model, the input terminus of the first sub-invertor and the second sub-invertor all is connected to described photovoltaic array; The described first sub-invertor further comprises the first inverter circuit and the first control module; The described second sub-invertor further comprises the second inverter circuit and the 2nd MPPT control module, described the first control module and described the 2nd MPPT control module connecting communication; Described the first control module gathers dc voltage and the electric current of the output of described photovoltaic array, and the pwm signal that will guarantee to export the rated frequency alternating-current sends to described the first inverter circuit and carries out inversion; Described the 2nd MPPT control module gathers dc voltage and the electric current of described photovoltaic array output, and the pwm signal of MPPT control is sent to described the second inverter circuit carries out inversion.

In according to photovoltaic seawater desalination system described in the utility model, described photovoltaic array further comprises the first sub-photovoltaic array and the second sub-photovoltaic array; It is described lift pump power supply that the output terminal of described the first sub-photovoltaic array is connected to the described first sub-invertor, and it is described high-pressure pump power supply that the output terminal of described the second sub-photovoltaic array is connected to the described second sub-invertor; The described first sub-invertor further comprises the first inverter circuit and a MPPT control module; The described second sub-invertor further comprises the second inverter circuit and the 2nd MPPT control module, a described MPPT control module and described the 2nd MPPT control module connecting communication; Dc voltage and the electric current of the described first sub-photovoltaic array of a described MPPT control module Gather and input, and the pwm signal of MPPT control is sent to described the first inverter circuit carry out inversion; Dc voltage and the electric current of the described second sub-photovoltaic array of described the 2nd MPPT control module Gather and input, and the pwm signal of MPPT control is sent to described the second inverter circuit carry out inversion.

According to the first sub-invertor described in the photovoltaic seawater desalination system described in the utility model and the integrated realization internal communication that arranges of the second sub-invertor.

The utility model is also corresponding to provide a kind of photovoltaic sea water desaltination invertor, described photovoltaic sea water desaltination invertor is connected between photovoltaic array and the sea water desaltination module, be used for receiving the direct current with described photovoltaic array output, and the alternating-current after the inversion exported to described sea water desaltination module power; Described photovoltaic sea water desaltination invertor further comprises the first sub-invertor and the second sub-invertor; The described first sub-invertor is connected between the lift pump of described photovoltaic array and sea water desaltination module, is used for dc inverter with described photovoltaic array and is alternating-current and export to described lift pump and power; The described second sub-invertor is connected between the high-pressure pump of described photovoltaic array and sea water desaltination module, is used for dc inverter with described photovoltaic array and is alternating-current and export to described high-pressure pump and power.

In according to photovoltaic sea water desaltination invertor described in the utility model, the described first sub-invertor is connected with the described second sub-invertor communication; The described first sub-invertor links to each other with described lift pump, and the alternating-current that inversion goes out after being used for starting shooting sends to described lift pump; The described first sub-invertor also sends in when shutdown and stops inverter signal and cut out high-pressure pump to the described second sub-invertor, and the described first sub-invertor stops to send alternating-current to described lift pump again; The described second sub-invertor links to each other with described high-pressure pump, and the alternating-current of inversion sends to described high-pressure pump after being used for starting shooting; The described second sub-invertor also stops to send alternating-current to described high-pressure pump in when shutdown, sends to stop inverter signal and close lift pump to the described first sub-invertor again.

In according to photovoltaic sea water desaltination invertor described in the utility model, the input terminus of the first sub-invertor and the second sub-invertor all is connected to described photovoltaic array; The described first sub-invertor further comprises the first inverter circuit and the first control module; The described second sub-invertor further comprises the second inverter circuit and the 2nd MPPT control module, described the first control module and described the 2nd MPPT control module connecting communication; Described the first control module gathers dc voltage and the electric current of the output of described photovoltaic array, and the pwm signal that will guarantee to export the rated frequency alternating-current sends to described the first inverter circuit and carries out inversion; Described the 2nd MPPT control module gathers dc voltage and the electric current of described photovoltaic array output, and the pwm signal of MPPT control is sent to described the second inverter circuit carries out inversion.

In according to photovoltaic sea water desaltination invertor described in the utility model, described photovoltaic array further comprises the first sub-photovoltaic array and the second sub-photovoltaic array; It is described lift pump power supply that the output terminal of described the first sub-photovoltaic array is connected to the described first sub-invertor, and it is described high-pressure pump power supply that the output terminal of described the second sub-photovoltaic array is connected to the described second sub-invertor; The described first sub-invertor further comprises the first inverter circuit and a MPPT control module; The described second sub-invertor further comprises the second inverter circuit and the 2nd MPPT control module, a described MPPT control module and described the 2nd MPPT control module connecting communication; Dc voltage and the electric current of the described first sub-photovoltaic array of a described MPPT control module Gather and input, and the pwm signal of MPPT control is sent to described the first inverter circuit carry out inversion; Dc voltage and the electric current of the described second sub-photovoltaic array of described the 2nd MPPT control module Gather and input, and the pwm signal of MPPT control is sent to described the second inverter circuit carry out inversion.

Implement photovoltaic sea water desaltination invertor of the present utility model and photovoltaic seawater desalination system, have following beneficial effect: the utility model is by photovoltaic sea water desaltination invertor, the dc inverter of directly photovoltaic array being exported is to the device that needs in the sea water desaltination module to power, make system successfully save store battery, both improve the reliability of system and device, significantly reduced again construction cost and the maintenance cost of system.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the module diagram according to the preferred embodiment of photovoltaic seawater desalination system of the present utility model;

Fig. 2 is the concrete module diagram according to sea water desaltination module in the preferred embodiment of photovoltaic seawater desalination system of the present utility model;

Fig. 3 is the module diagram according to the first embodiment of photovoltaic sea water desaltination invertor of the present utility model;

Fig. 4 is the concrete module diagram according to the first embodiment of photovoltaic sea water desaltination invertor of the present utility model;

Fig. 5 is the module diagram according to the second embodiment of photovoltaic sea water desaltination invertor of the present utility model;

Fig. 6 is the concrete module diagram according to the second embodiment of photovoltaic sea water desaltination invertor of the present utility model;

Fig. 7 is the schematic diagram according to the first embodiment of inverter circuit in the photovoltaic sea water desaltination invertor of the present utility model;

Fig. 8 is the schematic diagram according to the second embodiment of inverter circuit in the photovoltaic sea water desaltination invertor of the present utility model.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.

See also Fig. 1, be the module diagram according to the preferred embodiment of photovoltaic seawater desalination system of the present utility model.The photovoltaic seawater desalination system that the utility model preferred embodiment provides comprises photovoltaic generating module and sea water desaltination module 300.Wherein, photovoltaic generating module comprises photovoltaic array 100 and photovoltaic sea water desaltination invertor 200.

Photovoltaic array 100 is used for changing luminous energy into direct current output.200 of photovoltaic sea water desaltination invertors are connected between photovoltaic array 100 and the sea water desaltination module 300, be used for to receive the direct current of photovoltaic array 100 outputs and are that alternating-current is exported to sea water desaltination module 300 and powered with its inversion.Sea water desaltination module 300 is used for seawater is carried out desalting treatment, is processed into satisfactory fresh water.

The photovoltaic seawater desalination system that the utility model provides combines solar energy generation technology with Reverse-osmosis Seawater Desalination Technology, can replace the fresh water Support Mode that existing long distance is sent water or adopted diesel power generation to carry out sea water desaltination, the reliability that can improve the fresh water supply can reduce water supply cost again.Simultaneously, the system that the utility model provides is by photovoltaic sea water desaltination invertor 200, the dc inverter of directly photovoltaic array 100 being exported is to the device that needs in the sea water desaltination module 300 to power, make system successfully save store battery, both improve the reliability of system and device, significantly reduced again construction cost and the maintenance cost of system.Be with should be appreciated that, the utility model does not limit the concrete formation of sea water desaltination module 300, sea water desaltination module 300 can adopt this area basic technology personnel to know and applicable various desalination technology is realized, such as reverse osmosis method, electrodialytic membranes method of evaporation etc., and the utility model only need to be connected to the device of the running that needs in the sea water desaltination module 300 to switch on photovoltaic sea water desaltination invertor 200 and powers and get final product.

See also Fig. 2, be the concrete module diagram according to sea water desaltination module in the preferred embodiment of photovoltaic seawater desalination system of the present utility model.As shown in Figure 2, this embodiment adopts reverse osmosis method to carry out sea water desaltination and processes, and wherein, adopts the technical process of the photovoltaic seawater desalination system of reverse osmosis method mainly to comprise the processes such as water lift, pre-treatment, reverse-osmosis treated, energy recovery.

Sea water desaltination module 300 comprises lift pump 310, pre-processing assembly 320, high-pressure pump 330 and the reverse osmosis module 340 that connects successively at least.

Lift pump 310 be used for seawater from the water source such as the seawater well be extracted into pre-processing assembly 320, and provide enough top hole pressures.This lift pump 310 is generally impeller pump.

320 pairs of seawater of pre-processing assembly carry out pre-treatment, comprise according to factors such as seawater quality and fresh water purposes, adopt and pass through first the filtrations such as accurate filter and cartridge filter, chlorination, cohesion are filtered, add acid for adjusting pH value, add Scale inhibitors, are eliminated the measure such as chlorine residue again, prevent 340 contaminated and dirty blocking up of reverse osmosis group of rear end.

High-pressure pump 330 is as the heart component of sea water desaltination module, is used for being delivered to reverse osmosis module 340 after the pretreated seawater pressurization, and provides reverse osmosis process required pressure for seawater.This high-pressure pump 330 is generally reciprocating plunger pump or stage chamber pump.In preferred embodiment of the present utility model, the energy recycle device 360 of usually installing at high-pressure pump 330 places reclaims the portion of energy of strong brine, can significantly improve the capacity usage ratio of system, thereby effectively reduce working cost.

Reverse osmosis module 340 is by reverse osmosis membrane seawater to be carried out desalting treatment.In preferred embodiment of the present utility model, the fresh water after passing through fresh-water tank 350 stores processor behind the reverse osmosis module 340.Reverse osmosis membrane as a kind of with exotic materials and working method film that make, that have semi-transparent performance, at sea pressure during greater than the osmotic pressure of film, water molecules can see through reverse osmosis membrane, and fresh water enters fresh-water tank 350 through the fresh water valve, and solute is blocked in the opposite side of film.Dense water pressure after the reverse osmosis membrane processing is up to 4～6Mpa.Compare with traditional desalination technology, for example there is distillation method (to comprise the multistage flash evaporation multi-effect distilling, press steam distillation etc.), ion exchange method, cold method etc., the reverse osmosis method desalination technology that the utility model adopts more is applicable to desalinize seawater on a large scale, its reduced investment, energy consumption is low, construction period is shorter, be easy to automatic control, be applicable to seawater, the desalting engineering of the large, medium and small scale of brackish water, device volume is little, equipment and simple to operate, and at normal temperatures operation, corrosion and the scaling degree of equipment are lighter, are technology with fastest developing speed over nearly 20 years in the desalination technology.

Photovoltaic sea water desaltination invertor 200 can be that three-phase alternating current is exported to respectively lift pump 310 and powered with the dc inverter of photovoltaic array 100 output, and high-pressure pump 330 is powered.

The utility model is corresponding to provide employed photovoltaic sea water desaltination invertor in the above-mentioned photovoltaic seawater desalination system.The below is specifically described this photovoltaic sea water desaltination invertor.

See also Fig. 3, be the module diagram according to the first embodiment of photovoltaic sea water desaltination invertor of the present utility model.As shown in Figure 3, the photovoltaic sea water desaltination invertor 200 that provides of this first embodiment further comprises the first sub-invertor 210 and the second sub-invertor 220.

In this embodiment, the input terminus of the first sub-invertor 210 and the second sub-invertor 220 is connected to the output terminal of same photovoltaic array 100 simultaneously, namely inputs the dc voltage V of the first sub-invertor 210 _PV1Dc voltage V with input the second sub-invertor 220 _PV2Equate, be the dc voltage V of photovoltaic array 100 outputs _PVThe output terminal of the first sub-invertor 210 is connected to lift pump 310, is used for dc inverter with photovoltaic array 100 and is alternating-current and export to lift pump 310 and power.The output terminal of the second sub-invertor 220 is connected to high-pressure pump 330, is used for dc inverter with photovoltaic array 100 and is alternating-current and export to high-pressure pump 330 and power.

In the photovoltaic sea water desaltination invertor 200 of the present utility model, the first sub-invertor 210 and the second sub-invertor 220 connecting communications are controlled the work of lift pump 310 and high-pressure pump 330 in an orderly manner.

The below is described in detail the major control process of the photovoltaic sea water desaltination invertor 200 that the first embodiment provides.The photovoltaic sea water desaltination invertor 200 that the utility model provides can satisfy the requirement of photovoltaic seawater desalination system fully automatic operation, and system's operation control mainly is divided into start, operation and shutdown three phases.

1, start-up phase:

After the sunrise, photovoltaic sea water desaltination invertor 200 is according to the dc voltage V of the output of photovoltaic array 100 _PVJudge intensity of solar radiation, open sequentially lift pump 310 and high-pressure pump 330.

The first sub-invertor 210 is at the dc voltage V of input _PV1Be dc voltage V _PVReach default lift pump start voltage V _1SRear startup start namely begins inversion, and the alternating-current of inversion is exported to lift pump 310 to start lift pump 310.

V _peak<V _1S<V _open; （1）

Wherein, V _PeakAnd V _OpenBe respectively nominal maximum power point voltage and the open circuit voltage of photovoltaic array.

The first sub-invertor 210 is after smooth running, and the second sub-invertor 220 is at the dc voltage V of input _PV2Be dc voltage V _PVReach default high-pressure pump start voltage V _2SRear startup start namely begins inversion, and the alternating-current of inversion is exported to high-pressure pump 330 to start high-pressure pump 330.

V _1S<V _2S<V _open； （2）

When not limiting high-pressure pump start voltage V _2SLift pump start voltage V _1SThe time, the first sub-invertor 210 also can send starting-up signal to inform the second sub-invertor 220 entrys into service of lift pump 310 to the second sub-invertor 220 after the beginning inversion, at this moment, the second sub-invertor 220 is detecting the dc voltage V of this starting-up signal and input _PVReach default high-pressure pump start voltage V _2SRear beginning inversion starts high-pressure pump 330.

2, the operation phase: the first sub-invertor 210 is that alternating-current is exported to lift pump 310 and powered with the dc inverter of photovoltaic array 100.The dc inverter of the photovoltaic array 100 of the second sub-invertor 220 is that alternating-current is exported to high-pressure pump 330 and powered.In preferred embodiment of the present utility model, further provide the control method of this inversion process.For example, the first sub-invertor 210 is realized the rated frequency inversion, and the second sub-invertor 220 is realized MPPT control.Particularly, the first sub-invertor 210 gathers the dc voltage V of photovoltaic array 100 outputs _PVAnd electric current I _PVRegulate the output frequency f of the described first sub-invertor 210 ₁Maintain rated frequency f _1R, namely with rated frequency f _1RAlternating-current export to lift pump 310, make lift pump 310 keep the specified speeds operation, guarantee flow and the pressure of high-pressure pump 330 entrances.The second sub-invertor 220 gathers the dc voltage V of photovoltaic array 100 outputs _PVAnd electric current I _PVRegulate the output frequency f of the second sub-invertor 220 according to maximal power tracing (MPPT) algorithm ₂, the alternating-current of MPPT control is exported to described high-pressure pump 330.

For example, can adopt traditional disturbance observation to determine the adjusting direction of next cycle output frequency f according to the variation of the output rating of the second sub-invertor 220.

f(n ₁)＝f(n ₁-1)+Δf(n ₁) (3)

$\mathrm{\&Delta;f}\left(n_1\right)=\left\{\begin{array}{cc}\mathrm{\&Delta;f}(n_1-1)& P\left(n_1\right)\&GreaterEqual;P(n_1-1)\\ -\mathrm{\&Delta;f}(n_1-1)& P\left(n_1\right)<P(n_1-1)\end{array}\right.---\left(4\right)$

In formula (3) and (4), Δ f represents output frequency adjusting step-length; n ₁Represent residing MPPT control cycle; P is power, is voltage V _PVAnd electric current I _PVProduct.After f determined, the second sub-invertor 220 was again according to frequency conversion speed-adjusting system (VVVF) control principle, frequency that output decide and the big or small voltage of alternating current of three phase alternating current motor.

Along with weakening of intensity of solar radiation, the second sub-invertor 220 in the MPPT control process, output frequency f ₂Be low to moderate the low-limit frequency f of the second sub-invertor 220 that sets in advance _2minThe time, keep this low-limit frequency f _2minOutput.

In operational process, because lift pump 310 keeps the specified speeds operation, its power is substantially constant, and far below the power of high-pressure pump 330, therefore can not affect high-pressure pump MPPT control characteristic.

3, shut-down-phase:

At sunset, photovoltaic sea water desaltination invertor 200 will be closed down high-pressure pump 330 and lift pump 310 sequentially.

The first sub-invertor 210 is at the dc voltage V of photovoltaic array 100 outputs _PVBe lower than default lift pump shutdown voltage V _1STOPShi Guanji, first transmission stops inverter signal and stops inversion to close high-pressure pump 330 to the second sub-invertor 220, and this first sub-invertor 210 self stops inversion again, namely stops to send alternating-current to close lift pump 310 to lift pump 310.

The second sub-invertor 220 is at the dc voltage V of photovoltaic array 100 outputs _PVBe lower than default high-pressure pump shutdown voltage V _2STOPShi Guanji first self stops inversion, namely stops to send alternating-current to close high-pressure pump 330 to high-pressure pump 330, sends to stop inverter signal and stop inversion and close lift pump 310 to control this first sub-invertor 210 to the first sub-invertor 210 again.Above-mentioned lift pump shutdown voltage V _1STOPWith high-pressure pump shutdown voltage V _2STOPCan be set to identical or different.Preferably, high-pressure pump shutdown voltage V _2STOPCan be higher than lift pump shutdown voltage V _1STOP, close prior to lift pump 310 to ensure high-pressure pump 330, simplify procedures.

See also Fig. 4, be the concrete module diagram according to the first embodiment of photovoltaic sea water desaltination invertor of the present utility model.The concrete principle of compositionality of the above-mentioned first sub-invertor 210 and the second sub-invertor 220 is disclosed as shown in Figure 4.Be, the utility model is not limited to implementation as shown in the figure with should be appreciated that, and can adopt this area basic technology personnel to know and applicable various inverter control circuits.

The first sub-invertor 210 comprises that further the first inverter circuit 211 and the first control module 212, the second sub-invertors further comprise the second inverter circuit 221 and the 2nd MPPT control module 222.Wherein the first control module 212 and the 2nd MPPT control module 222 connecting communications.

The first inverter circuit 211 can adopt multiple topology to realize, such as the single-stage inversion, and twin-stage inversion, tri-level inversion and with the various structures of transformer isolation.The first control module 212 is used for sending pwm signal and realizes inversion control to the first inverter circuit 211.Specifically, the input terminus of the first inverter circuit 211 links to each other with the output terminal of photovoltaic array 100, through exporting three-phase alternating current after the control inversion of pwm signal to lift pump 310.The dc voltage V that the first control module 212 is used in photovoltaic array 100 outputs _PVReach default lift pump start voltage V _1SAfter, send pwm signal and carry out inversion to the first inverter circuit 211, open lift pump 310.The first control module 212 is regulated the output frequency f of the first inverter circuit 211 by pwm signal after the beginning inversion ₁Maintain rated frequency f _1RThe dc voltage V that the first control module 212 is also exported at photovoltaic array 100 _PVBe lower than default lift pump shutdown voltage V _1STOPIn time, sends first and stops inverter signal and close high-pressure pump 330, the first control modules 212 to the 2nd MPPT control module 222 and self stop sending pwm signal to close lift pump 310 again.

The second inverter circuit 221 also can adopt multiple topology to realize.The 2nd MPPT control module 222 is used for sending pwm signal and realizes inversion control to the second inverter circuit 221.Specifically, the input terminus of the second inverter circuit 221 links to each other with the output terminal of photovoltaic array 100, exports three-phase alternating current to high-pressure pump 330 through the control inversion of pwm signal.The dc voltage V that the 2nd MPPT control module 222 is used in photovoltaic array 100 outputs _PVReach default high-pressure pump start voltage V _2SAfter, send pwm signal and carry out inversion to the second inverter circuit 221; Described the 2nd MPPT control module 222 gathers the dc voltage V of photovoltaic array 100 outputs after the beginning inversion _PVAnd electric current I _PVRegulate the output frequency f of the second inverter circuit 221 according to the MPPT algorithm ₂, such as aforementioned formula (3) and formula (4).And the 2nd MPPT control module 222 in carrying out the MPPT control process at output frequency f ₂Be low to moderate the low-limit frequency f of the predefined second sub-invertor 220 _2minThe time, keep this low-limit frequency f _2minOutput.The dc voltage V that the 2nd MPPT control module is also exported at photovoltaic array 100 _PVBe lower than default high-pressure pump shutdown voltage V _2STOPIn time, stops first sending pwm signal and closes lift pump 310, sends to stop inverter signal and stop inversion to close high-pressure pump 330 to the first control module 212 again.

In the above-described embodiments, coordination and MPPT control non-interference in order to guarantee two starting mode of pump orders must keep good communication between the two estrade invertors.But Communication processing has not only taken the software and hardware resources of control chip, has affected the dynamic control performance of system, and also corrosion-vulnerable of communication interface and line, and the reliability service of system is brought hidden danger.In other preferred embodiments of the present utility model, the basic enterprising one-step optimization system in previous embodiment integrates the first sub-invertor 210 and the second sub-invertor 220, has saved the external communication link.For example, in Fig. 4, can adopt same control chip to realize the first control module 212 and the 2nd MPPT control module 222, the input terminus of the first inverter circuit 211 and the second inverter circuit 221 links to each other, be connected to photovoltaic array 100, output terminal is exported respectively the different alternating-current of two-way and is connect two different water pumps.The interface output frequency that wherein connects lift pump is steady state value; And the interface output frequency that connects high-pressure pump is regulated in real time according to the variation of intensity of sunshine, realizes MPPT maximum power point tracking.This control mode is identical with previous embodiment.

See also Fig. 5, be the module diagram according to the second embodiment of photovoltaic sea water desaltination invertor of the present utility model.Photovoltaic seawater desalination system as shown in Figure 5 correspondingly also is provided.As shown in Figure 5, the photovoltaic sea water desaltination invertor 200 that provides of this first embodiment also further comprises the first sub-invertor 210 and the second sub-invertor 220.The difference of this second embodiment and the first embodiment is, photovoltaic array 100 further comprises the first sub-photovoltaic array 110 and the second sub-photovoltaic array 120.

The output terminal of the first sub-photovoltaic array 110 is connected to the first sub-invertor 210 and is lift pump 310 power supplies, and the output terminal of the second sub-photovoltaic array 120 is connected to the second sub-invertor 220 and is high-pressure pump 330 power supplies.

That is to say, the input terminus of the first sub-invertor 210 and the second sub-invertor 220 is connected to respectively the output terminal of the first sub-photovoltaic array 110 and the output terminal of the second sub-photovoltaic array 120, namely inputs the dc voltage V of the first sub-invertor 210 _PV1Be the dc voltage of the first sub-photovoltaic array 110 outputs, input the dc voltage V of the second sub-invertor 220 _PV2It is the dc voltage of the second sub-photovoltaic array 110 outputs.The output terminal of the first sub-invertor 210 is connected to lift pump 310, is used for dc inverter with the first sub-invertor 210 and is alternating-current and export to lift pump 310 and power.The output terminal of the second sub-invertor 220 is connected to high-pressure pump 330, is used for dc inverter with the second sub-photovoltaic array 120 and is alternating-current and export to high-pressure pump 330 and power.

In the photovoltaic sea water desaltination invertor 200 of the present utility model, the first sub-invertor 210 and the second sub-invertor 220 connecting communications are controlled the work of lift pump 310 and high-pressure pump 330 in an orderly manner.

The below is described in detail the major control process of the photovoltaic sea water desaltination invertor 200 that the second embodiment provides.Be divided into equally start, operation and shutdown three phases.

1, start-up phase:

After the sunrise, photovoltaic sea water desaltination invertor 200 is judged intensity of solar radiation according to the dc voltage of two sub-photovoltaic array outputs of photovoltaic array 100, opens sequentially lift pump 310 and high-pressure pump 330.

The first sub-invertor 210 is at the dc voltage V of input _PV1The dc voltage V of i.e. the first sub-photovoltaic array 110 outputs _PV1Reach default lift pump start voltage V _1SRear startup start namely begins inversion, and the alternating-current of inversion is exported to lift pump 310 to start lift pump 310.Equally, lift pump start voltage V _1SSatisfy formula (1).

The first sub-invertor 210 is after smooth running, and the second sub-invertor 220 is at the dc voltage V of input _PV2The dc voltage V of i.e. the second sub-photovoltaic array 210 outputs _PV2Reach default high-pressure pump start voltage V _2SRear startup start namely begins inversion, and the alternating-current of inversion is exported to high-pressure pump 330 to start high-pressure pump 330.Equally, high-pressure pump start voltage V _2SAlso can satisfy formula (2).When not limiting high-pressure pump start voltage V _2SLift pump start voltage V _1SThe time, the first sub-invertor 210 also can send starting-up signal to inform the second sub-invertor 220 entrys into service of lift pump 310 to the second sub-invertor 220 after the beginning inversion, at this moment, the second sub-invertor 220 is detecting the dc voltage V of this starting-up signal and input _PV2Reach default high-pressure pump start voltage V _2SRear beginning inversion starts high-pressure pump 330.

2, the operation phase: the first sub-invertor 210 is that alternating-current is exported to lift pump 310 and powered with the dc inverter of the first sub-photovoltaic array 110 outputs.The second sub-invertor 220 is that alternating-current is exported to high-pressure pump 330 and powered with the dc inverter of the second sub-photovoltaic array 120 outputs.In preferred embodiment of the present utility model, further provide the control method of this inversion process.For example, the first sub-invertor 210 and the second sub-invertor 220 all can be realized MPPT control.Particularly, the dc voltage V of the first sub-photovoltaic array 110 of the first sub-invertor 210 Gather and inputs _PV1And electric current I _PV1Regulate the output frequency f of the first sub-invertor 210 according to the MPPT algorithm ₁Namely the alternating-current of MPPT control is exported to lift pump 310.The second sub-invertor 220 gathers the dc voltage V of photovoltaic array 100 outputs _PVAnd electric current I _PVRegulate the output frequency f of the second sub-invertor 220 according to the MPPT algorithm ₂, the alternating-current of MPPT control is exported to described high-pressure pump 330.For example, all can adopt the method regulating frequency of aforementioned formula (3) and formula (4).

Along with weakening of intensity of solar radiation, the first sub-invertor 210 in carrying out the MPPT control process at output frequency f ₁Be low to moderate the low-limit frequency f of the first sub-invertor 210 that sets in advance _1minThe time, keep this low-limit frequency f _1minOutput.The second sub-invertor 220 in the MPPT control process, output frequency f ₂Be low to moderate the low-limit frequency f of the second sub-invertor 220 that sets in advance _2minThe time, keep this low-limit frequency f _2minOutput.

In operational process, the first sub-invertor 210 is implemented MPPT control according to solar irradiation, and guarantees flow and the pressure of high-pressure pump 330 entrances.The second sub-invertor 220 is also implemented MPPT control according to solar irradiation, realizes sea water desaltination for seawater provides the required pressure of reverse osmosis process.

3, shut-down-phase:

At sunset, photovoltaic sea water desaltination invertor 200 will be closed down high-pressure pump 330 and lift pump 310 sequentially.Identical among this process and aforementioned the first embodiment.

The first sub-invertor 210 is at the dc voltage V of the first sub-photovoltaic array 110 outputs _PV1Be lower than default lift pump shutdown voltage V _1STOPShi Guanji, first transmission stops inverter signal and stops inversion to close high-pressure pump 330 to the second sub-invertor 220, and this first sub-invertor 210 self stops inversion again, namely stops to send alternating-current to close lift pump 310 to lift pump 310.

The second sub-invertor 220 is at the dc voltage V of the second sub-photovoltaic array 110 outputs _PV2Be lower than default high-pressure pump shutdown voltage V _2STOPShi Guanji first self stops inversion, namely stops to send alternating-current to close high-pressure pump 330 to high-pressure pump 330, sends to stop inverter signal and stop inversion and close lift pump 310 to control this first sub-invertor 210 to the first sub-invertor 210 again.Above-mentioned V _1STOPAnd V _2STOPCan be set to identical or different.

See also Fig. 6, be the concrete module diagram according to the second embodiment of photovoltaic sea water desaltination invertor of the present utility model.The concrete principle of compositionality of the above-mentioned first sub-invertor 210 and the second sub-invertor 220 is disclosed as shown in Figure 6.Be, the utility model is not limited to implementation as shown in the figure with should be appreciated that, and can adopt this area basic technology personnel to know and applicable various inverter control circuits.

The first sub-invertor 210 comprises that further the first inverter circuit 211 and a MPPT control module 213, the second sub-invertors further comprise the second inverter circuit 221 and the 2nd MPPT control module 222.Wherein a MPPT control module 213 and the 2nd MPPT control module 222 connecting communications.

The first inverter circuit 211 can adopt multiple topology to realize, such as the single-stage inversion, and twin-stage inversion, tri-level inversion and with the various structures of transformer isolation.The one MPPT control module 213 is used for sending pwm signal and realizes inversion control to the first inverter circuit 211.Specifically, the input terminus of the first inverter circuit 211 links to each other with the output terminal of the first sub-photovoltaic array 110, through exporting three-phase alternating current after the control inversion of pwm signal to lift pump 310.The one MPPT control module 213 is used for the dc voltage V in the first sub-photovoltaic array 110 outputs _PV1Reach default lift pump start voltage V _1SAfter, send pwm signal and carry out inversion to the first inverter circuit 211, open lift pump 310.The one MPPT control module 213 gathers the dc voltage V of the first sub-photovoltaic array 110 outputs after the beginning inversion _PV1And electric current I _PV1Regulate the output frequency f of the first inverter circuit 211 according to the MPPT algorithm ₁, such as aforementioned formula (3) and formula (4).And a MPPT control module 213 in carrying out the MPPT control process at output frequency f ₁Be low to moderate the low-limit frequency f of the predefined first sub-invertor 220 _1minThe time, keep this low-limit frequency f _1minOutput.The dc voltage V that the one MPPT control module 213 is also exported at the first sub-photovoltaic array 110 _PV1Be lower than default lift pump shutdown voltage V _1STOPIn time, sends first and stops inverter signal and close high-pressure pump 330, the one MPPT control modules 213 to the 2nd MPPT control module 222 and self stop sending pwm signal to close lift pump 310 again.

The second inverter circuit 221 also can adopt multiple topology to realize.The 2nd MPPT control module 222 is used for sending pwm signal and realizes inversion control to the second inverter circuit 221.Specifically, the input terminus of the second inverter circuit 221 links to each other with the output terminal of the second sub-photovoltaic array 120, exports three-phase alternating current to high-pressure pump 330 through the control inversion of pwm signal.The 2nd MPPT control module 222 is used for the dc voltage V in the second sub-photovoltaic array 120 outputs _PV2Reach default high-pressure pump start voltage V _2SAfter, send pwm signal and carry out inversion to the second inverter circuit 221; Described the 2nd MPPT control module 222 gathers the dc voltage V of the second sub-photovoltaic array 120 outputs after the beginning inversion _PV2And electric current I _PV2Regulate the output frequency f of the second inverter circuit 221 according to the MPPT algorithm ₂, such as aforementioned formula (3) and formula (4).And the 2nd MPPT control module 222 in carrying out the MPPT control process at output frequency f ₂Be low to moderate the low-limit frequency f of the predefined second sub-invertor 220 _2minThe time, keep this low-limit frequency f _2minOutput.The dc voltage V that the 2nd MPPT control module is also exported at the second sub-photovoltaic array 120 _PV2Be lower than default high-pressure pump shutdown voltage V _2STOPIn time, stops first sending pwm signal and closes lift pump 310, sends to stop inverter signal and stop inversion to close high-pressure pump 330 to the first control module 212 again.

In above-mentioned the second embodiment, the Communication processing between the two estrade invertors has taken the software and hardware resources of control chip equally, has affected the dynamic control performance of system.In other preferred embodiments of the present utility model, the basic enterprising one-step optimization system in previous embodiment integrates the first sub-invertor 210 and the second sub-invertor 220, has saved the external communication link.For example, in Fig. 6, can adopt same control chip to realize a MPPT control module 213 and the 2nd MPPT control module 222, the input terminus of the first inverter circuit 211 and the second inverter circuit 221 is connected to respectively the first sub-photovoltaic array 110 and the second sub-photovoltaic array 120, and output terminal is exported respectively the different alternating-current of two-way and connect two different water pumps.The interface output frequency that wherein connects lift pump is regulated in real time according to the variation of intensity of sunshine, realizes MPPT maximum power point tracking; And the interface output frequency that connects high-pressure pump also can be realized MPPT maximum power point tracking.Its control mode is identical with aforementioned the second embodiment.

See also Fig. 7, be the schematic diagram according to the first embodiment of inverter circuit in the photovoltaic sea water desaltination invertor of the present utility model.Inverter circuit in the above-mentioned photovoltaic sea water desaltination invertor can adopt multiple topology to realize, such as the single-stage inversion, and twin-stage inversion, tri-level inversion and with the various structures of transformer isolation.Fig. 7 shows the schematic circuit of single-stage inversion.Above-mentioned the first inverter circuit 211 and the second inverter circuit 221 all can adopt this single-stage inverter circuit 20 to realize.This single-stage inverter circuit 20 adopts simplified construction, i.e. the DC bus-bar voltage V of single-stage inversions _BusEqual the dc voltage V of photovoltaic array 100 outputs _PVWhen connecting different sub-photovoltaic arrays, be respectively the separately dc voltage V of output _PV1And V _PV2Each switching tube in the single-stage inverter circuit 20 is subject to the control of the PWM ripple of the corresponding control module that connects.The highest voltage of alternating current and DC bus-bar voltage V that photovoltaic sea water desaltination invertor can be exported _BusBe directly proportional.When requiring lift pump 310 and high-pressure pump 330 all to adopt 220V three-phase alternating current water pump in the photovoltaic seawater desalination system, photovoltaic array 100 maximum power point voltages that match should surpass 320V.Require lift pump 310 and high-pressure pump 330 all to adopt the three-phase alternating current water pump of 380V in the present embodiment in the photovoltaic seawater desalination system, the maximum power point voltage of photovoltaic array 100 is 560V.

See also Fig. 8, be the schematic diagram according to the second embodiment of inverter circuit in the photovoltaic sea water desaltination invertor of the present utility model.This embodiment shows the schematic circuit of twin-stage inversion.Above-mentioned the first inverter circuit 211 and the second inverter circuit 221 all can adopt this twin-stage inverter circuit to realize.This twin-stage inverter circuit comprises boost electronic circuit 21 and inversion electronic circuit 22.Concrete control method is by the output DC voltage V of electronic circuit 21 with photovoltaic array 100 that boost _PVBe promoted to DC bus-bar voltage V _Bus, and 22 couples of DC bus-bar voltage V of inversion electronic circuit _BusOutput AC voltage drives respectively lift pump 310 and high-pressure pump 330 after carrying out the DC/AC conversion.Each switching tube in switching tube S1 in the electronic circuit 21 and the inversion electronic circuit 22 of boosting all is subject to for example control of the PWM ripple that sends of the first control module 212 or a MPPT control module 213 or the 2nd MPPT control module 222 of the corresponding control module that connects.

With the photovoltaic seawater desalination system of 220V water pump coupling in, allowing photovoltaic array 100 maximum power point voltages is 100～350V; In the photovoltaic seawater desalination system of 380V water pump coupling, allowing photovoltaic array 100 maximum power point voltages is 200～600V; Obviously, adopt design and the configuration of twin-stage inverter circuit system to have greater flexibility.

In sum, the utility model adopts photovoltaic generation to carry out sea water desaltination, can send on the basis of water Support Mode in existing long distance, improves the reliability of the fresh water supply on remote island, has also reduced water supply cost.Simultaneously, the photovoltaic seawater desalination system that the utility model provides also saves the batteries to store energy device, and system reliability is high, significantly reduces construction and the maintenance cost of system simultaneously, increases the economy of system, is conducive to promote.In addition, the photovoltaic sea water desaltination invertor that the utility model provides also adopts converter technique, can effectively limit the starting current of lift pump, high-pressure pump; Integrated maximal power tracing algorithm is realized the to greatest extent utilization of sun power.

Should explanatorily be, the photovoltaic seawater desalination system that the utility model provides is identical with flow process with the principle that photovoltaic sea water desaltination invertor adopts, therefore also mutually applicable to elaborating of each embodiment of photovoltaic seawater desalination system or photovoltaic sea water desaltination invertor, the relation between the specific implementation process of modules and the mentioned parameter for example.In addition, the photovoltaic seawater desalination system that this area basic technology personnel know for seawater can be applied to landlocked brackish water desalination equally, therefore photovoltaic seawater desalination system of the present utility model and photovoltaic sea water desaltination invertor equally not only are defined in seawater are desalinated, and also are applicable to landlocked brackish water desalination field.

The utility model is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the utility model scope, can carry out various variations and be equal to replacement.In addition, for adapting to specific occasion or the material of the utility model technology, can carry out many modifications and not break away from its protection domain the utility model.Therefore, the utility model is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection domain.

Claims (10)

1. a photovoltaic seawater desalination system comprises photovoltaic generating module and sea water desaltination module (300); It is characterized in that, described photovoltaic generating module comprises photovoltaic array (100) and photovoltaic sea water desaltination invertor (200);

The direct current that described photovoltaic array (100) is used for luminous energy is changed is exported;

Described photovoltaic sea water desaltination invertor (200) is connected between described photovoltaic array (100) and the sea water desaltination module (300), is used for receiving the direct current of described photovoltaic array (100) output and the alternating-current after the inversion being exported to described sea water desaltination module (300) power.

2. photovoltaic seawater desalination system according to claim 1 is characterized in that, described sea water desaltination module (300) comprises lift pump (310), pre-processing assembly (320), high-pressure pump (330) and the reverse osmosis module (340) that connects successively at least; Described lift pump (310) is used for that seawater is extracted into described pre-processing assembly (320) from the water source and carries out pre-treatment; Described high-pressure pump (330) is used for carrying out the reverse osmosis desalination processing with being delivered to described reverse osmosis module (340) after the pretreated seawater pressurization; Described photovoltaic sea water desaltination invertor (200) further comprises the first sub-invertor (210) and the second sub-invertor (220);

The described first sub-invertor (210) is connected between described photovoltaic array (100) and the lift pump (310), is used for dc inverter with described photovoltaic array (100) and is alternating-current and export to described lift pump (310) and power;

The described second sub-invertor (220) is connected between described photovoltaic array (100) and the high-pressure pump (330), is used for dc inverter with described photovoltaic array (100) and is alternating-current and export to described high-pressure pump (330) and power.

3. photovoltaic seawater desalination system according to claim 2 is characterized in that, the described first sub-invertor (210) is connected with the described second sub-invertor (220) communication;

The described first sub-invertor (210) links to each other with described lift pump (310), and the alternating-current that inversion goes out after being used for starting shooting sends to described lift pump (310); The described first sub-invertor (210) also sends in when shutdown and stops inverter signal and cut out high-pressure pump (330) to the described second sub-invertor (220), and the described first sub-invertor (210) stops to send alternating-current to described lift pump (310) again;

The described second sub-invertor (220) links to each other with described high-pressure pump (330), and the alternating-current of inversion sends to described high-pressure pump (330) after being used for starting shooting; The described second sub-invertor (220) also stops to send alternating-current to described high-pressure pump (330) in when shutdown, sends to stop inverter signal and close lift pump (310) to the described first sub-invertor (210) again.

4. according to claim 2 or 3 described photovoltaic seawater desalination systems, it is characterized in that, the input terminus of the first sub-invertor (210) and the second sub-invertor (220) all is connected to described photovoltaic array (100);

The described first sub-invertor (210) further comprises the first inverter circuit (211) and the first control module (212); The described second sub-invertor (220) further comprises the second inverter circuit (221) and the 2nd MPPT control module (222), described the first control module (212) and described the 2nd MPPT control module (222) connecting communication;

Described the first control module (212) gathers the dc voltage (V of described photovoltaic array (100) output _PV) and electric current (I _PV), and the pwm signal that will guarantee to export the rated frequency alternating-current sends to described the first inverter circuit (211) and carries out inversion; Described the 2nd MPPT control module (222) gathers the dc voltage (V of described photovoltaic array (100) output _PV) and electric current (I _PV), and the pwm signal of MPPT control is sent to described the second inverter circuit (221) carry out inversion.

5. according to claim 2 or 3 described photovoltaic seawater desalination systems, it is characterized in that, described photovoltaic array (100) further comprises the first sub-photovoltaic array (110) and the second sub-photovoltaic array (120); The output terminal of the described first sub-photovoltaic array (110) is connected to the described first sub-invertor (210) and is described lift pump (310) power supply, and the output terminal of the described second sub-photovoltaic array (120) is connected to the described second sub-invertor (220) and is described high-pressure pump (330) power supply;

The described first sub-invertor (210) further comprises the first inverter circuit (211) and a MPPT control module (213); The described second sub-invertor (220) further comprises the second inverter circuit (221) and the 2nd MPPT control module (222), a described MPPT control module (213) and described the 2nd MPPT control module (222) connecting communication;

Dc voltage (the V of the described first sub-photovoltaic array (110) of described MPPT control module (a 213) Gather and input _PV1) and electric current (I _PV1), and the pwm signal of MPPT control is sent to described the first inverter circuit (211) carry out inversion; Dc voltage (the V of the described second sub-photovoltaic array (120) of described the 2nd MPPT control module (222) Gather and input _PV2) and electric current (I _PV2), and the pwm signal of MPPT control is sent to described the second inverter circuit (221) carry out inversion.

6. photovoltaic seawater desalination system according to claim 2 is characterized in that, the described first sub-invertor (210) and the integrated realization internal communication that arranges of the second sub-invertor (220).

7. photovoltaic sea water desaltination invertor, it is characterized in that, described photovoltaic sea water desaltination invertor (200) is connected between photovoltaic array (100) and the sea water desaltination module (300), be used for receiving the direct current of described photovoltaic array (100) output, and the alternating-current after the inversion exported to described sea water desaltination module (300) power;

Described photovoltaic sea water desaltination invertor (200) further comprises the first sub-invertor (210) and the second sub-invertor (220); The described first sub-invertor (210) is connected between the lift pump (310) of described photovoltaic array (100) and sea water desaltination module (300), is used for dc inverter with described photovoltaic array (100) and is alternating-current and export to described lift pump (310) and power; The described second sub-invertor (220) is connected between the high-pressure pump (330) of described photovoltaic array (100) and sea water desaltination module (300), is used for dc inverter with described photovoltaic array (100) and is alternating-current and export to described high-pressure pump (330) and power.

8. photovoltaic sea water desaltination invertor according to claim 7 is characterized in that, the described first sub-invertor (210) is connected with the described second sub-invertor (220) communication;

The described first sub-invertor (210) links to each other with described lift pump (310), and the alternating-current that inversion goes out after being used for starting shooting sends to described lift pump (310); The described first sub-invertor (210) also sends in when shutdown and stops inverter signal and cut out high-pressure pump (330) to the described second sub-invertor (220), and the described first sub-invertor (210) stops to send alternating-current to described lift pump (310) again;

The described second sub-invertor (220) links to each other with described high-pressure pump (330), and the alternating-current of inversion sends to described high-pressure pump (330) after being used for starting shooting; The described second sub-invertor (220) also stops to send alternating-current to described high-pressure pump (330) in when shutdown, sends to stop inverter signal and close lift pump (310) to the described first sub-invertor (210) again.

9. according to claim 7 or 8 described photovoltaic sea water desaltination invertors, it is characterized in that, the input terminus of the first sub-invertor (210) and the second sub-invertor (220) all is connected to described photovoltaic array (100);

The described first sub-invertor (210) further comprises the first inverter circuit (211) and the first control module (212); The described second sub-invertor (220) further comprises the second inverter circuit (221) and the 2nd MPPT control module (222), described the first control module (212) and described the 2nd MPPT control module (222) connecting communication;

Described the first control module (212) gathers the dc voltage (V of described photovoltaic array (100) output _PV) and electric current (I _PV), and the pwm signal that will guarantee to export the rated frequency alternating-current sends to described the first inverter circuit (211) and carries out inversion; Described the 2nd MPPT control module (222) gathers the dc voltage (V of described photovoltaic array (100) output _PV) and electric current (I _PV), and the pwm signal of MPPT control is sent to described the second inverter circuit (221) carry out inversion.

10. according to claim 7 or 8 described photovoltaic sea water desaltination invertors, it is characterized in that, described photovoltaic array (100) further comprises the first sub-photovoltaic array (110) and the second sub-photovoltaic array (120); The output terminal of the described first sub-photovoltaic array (110) is connected to the described first sub-invertor (210) and is described lift pump (310) power supply, and the output terminal of the described second sub-photovoltaic array (120) is connected to the described second sub-invertor (220) and is described high-pressure pump (330) power supply;

The described first sub-invertor (210) further comprises the first inverter circuit (211) and a MPPT control module (213); The described second sub-invertor (220) further comprises the second inverter circuit (221) and the 2nd MPPT control module (222), a described MPPT control module (213) and described the 2nd MPPT control module (222) connecting communication;

Dc voltage (the V of the described first sub-photovoltaic array (110) of described MPPT control module (a 213) Gather and input _PV1) and electric current (I _PV1), and the pwm signal of MPPT control is sent to described the first inverter circuit (211) carry out inversion; Dc voltage (the V of the described second sub-photovoltaic array (120) of described the 2nd MPPT control module (222) Gather and input _PV2) and electric current (I _PV2), and the pwm signal of MPPT control is sent to described the second inverter circuit (221) carry out inversion.

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