CN103633875B - A kind of photovoltaic water-raising inverter and control method thereof and photovoltaic water-raising system - Google Patents
A kind of photovoltaic water-raising inverter and control method thereof and photovoltaic water-raising system Download PDFInfo
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Abstract
The invention belongs to technical field of photovoltaic power generation, and relate to a kind of photovoltaic water-raising inverter and control method thereof and photovoltaic water-raising system.This photovoltaic water-raising inverter to be connected between water pump and photovoltaic array and to have MPPT function, and photovoltaic water-raising inverter of the present invention comprises booster circuit and inverter circuit; The output voltage of photovoltaic array is promoted to DC bus-bar voltage by booster circuit, and inverter circuit carries out DC/AC conversion to DC bus-bar voltage and exports the alternating voltage driving water pump.In the present invention, first the booster circuit of inverter can make the direct current of photovoltaic array export lifting before carrying out DC/AC conversion, therefore the range of choices of photovoltaic array output voltage is made to broaden, and then the configuration requirement reduced assembly each in photovoltaic array, make the configuration of the photovoltaic water-raising system containing this photovoltaic DC-to-AC converter more flexible.The combination of boosting and inversion and MPPT function can realize the control mode of multiple photovoltaic DC-to-AC converter, is convenient to optimize control effectively to its power output and voltage transitions performance.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation, and relate to a kind of the photovoltaic water-raising inverter and the control method thereof that are applied to photovoltaic water-raising system.
Background technology
Photovoltaic water-raising system is primarily of photovoltaic water-raising inverter, photovoltaic array and three-phase alternating current water pump composition (Fig. 1), and it is widely used in the photovoltaic Water Resources Domains such as agricultural irrigation, desert treatment, grassland herding, domestic water, desalinization, urban waterscape.Photovoltaic water-raising system is based on the theory of electric power storage not as retaining, employing is built cistern and saves storage battery, the method of electric power storage is substituted with retaining, both the reliability that system investments cost turn improves photovoltaic water-raising system equipment had been reduced, it also avoid the pollution of storage battery replacing to environment simultaneously, accomplish real economy, environmental protection.
Core control equipment in photovoltaic water-raising system is photovoltaic water-raising inverter, photovoltaic water-raising inverter is implemented to control and regulate to the operation of system on the one hand, the direct current sent by photovoltaic array is converted to alternating current in order to drive water pump, need according to the real-time regulation output frequency of the change of intensity of sunshine on the other hand, realize MPPT maximum power point tracking (MaximumPowerPointTracking, MPPT).
The three-phase alternating current water pump of photovoltaic water-raising system is when implementing variable frequency regulating speed control, and required input voltage is directly proportional to the rotating speed of pump motor, needs input rated voltage when rated speed.On the other hand, the highest alternating voltage that photovoltaic water-raising inverter can export is directly proportional to inverter DC bus-bar voltage Vbus again, the DC bus-bar voltage minimum wherein mated with specified alternating voltage 220V water pump is 320V, and the DC bus-bar voltage minimum mated with specified alternating voltage 380V water pump is 540V.And the main circuit of photovoltaic water-raising inverter all adopts the structure (Fig. 2) of single-stage invert at present, namely DC bus-bar voltage Vbus equals the output voltage Vpv of photovoltaic array.So mate with 220V three-phase alternating current water pump at present photovoltaic water-raising system, require that photovoltaic array maximum power point voltage is more than 320V; The photovoltaic water-raising system mated with 380V three-phase alternating current water pump, requires that photovoltaic array maximum power point voltage is more than 540V.
When adopting the photovoltaic water-raising inverter of single-stage invert structure, when three-phase alternating current water pump can make photovoltaic water-raising system be applied to lower-powered system to the high-tension requirement of photovoltaic array, connect due to polylith small-power photovoltaic module need be adopted and could meet high-tension requirement, flexibility is lacked to choosing of photovoltaic module.
Summary of the invention
The technical problem to be solved in the present invention is, cause choosing of photovoltaic module to lack flexibility and the problem affecting the output voltage of photovoltaic array and the matching of water pump voltage for the photovoltaic DC-to-AC converter of single step arrangement in prior art, a kind of the photovoltaic water-raising inverter and the control method thereof that the range of choices of photovoltaic array output voltage are broadened and then improves system configuration flexibility are provided.
The technical problem to be solved in the present invention is achieved by the following technical programs: provide a kind of photovoltaic water-raising inverter, and it to be connected between water pump and photovoltaic array and to have MPPT function, and described photovoltaic water-raising inverter comprises booster circuit and inverter circuit; The output voltage of described photovoltaic array is promoted to DC bus-bar voltage by described booster circuit, and described inverter circuit carries out DC/AC conversion to described DC bus-bar voltage and exports the alternating voltage driving described water pump.
In above-mentioned photovoltaic water-raising inverter, described photovoltaic water-raising inverter also comprises the first MPPT controller and the first DC bus-bar voltage constant-voltage controller;
Described first MPPT controller gathers output voltage and the output current of described photovoltaic array, in order to regulate and control the conducting duty ratio of described booster circuit, and then regulates and controls the DC bus-bar voltage of described booster circuit generation;
Described first DC bus-bar voltage constant-voltage controller carries out PWM control based on the comparative result of the DC bus-bar voltage steady state value preset and described DC bus-bar voltage to described inverter circuit, to regulate and control the alternating voltage that described inverter circuit exports.
In above-mentioned photovoltaic water-raising inverter, described photovoltaic water-raising inverter also comprises the second MPPT controller, constant boost pressure controller and the second DC bus-bar voltage constant-voltage controller;
Described second MPPT controller gathers output voltage and the output current of described photovoltaic array, in order to carry out PWM control to described inverter circuit, to regulate and control the alternating voltage that described inverter circuit exports;
Described constant boost pressure controller based on by described second MPPT controller regulation and control, the output frequency of described inverter circuit, for calculating the first DC bus-bar voltage reference value;
Described second DC bus-bar voltage constant-voltage controller regulates and controls the conducting duty ratio of described booster circuit, to regulate and control the DC bus-bar voltage that described booster circuit produces based on the comparative result of the first DC bus-bar voltage reference value and described DC bus-bar voltage.
In above-mentioned photovoltaic water-raising inverter, described photovoltaic water-raising inverter also comprises the second MPPT controller, dynamically boosted controller and the 3rd DC bus-bar voltage constant-voltage controller;
Described second MPPT controller gathers output voltage and the output current of described photovoltaic array, in order to carry out PWM control to described inverter circuit, to regulate and control the alternating voltage that described inverter circuit exports;
Described dynamically boosted controller based on by described second MPPT controller regulation and control, the output frequency of described inverter circuit, in order to set minimum direct current busbar voltage reference value;
Described 3rd DC bus-bar voltage constant-voltage controller regulates and controls the conducting duty ratio of described booster circuit, to regulate and control the DC bus-bar voltage that described booster circuit produces based on the comparative result of described minimum direct current busbar voltage reference value and described DC bus-bar voltage.
In above-mentioned photovoltaic water-raising inverter, the switching tube of described booster circuit and inverter circuit all adopts IGBT switching tube.
According to a further aspect in the invention, provide a kind of photovoltaic water-raising system, comprise water pump and photovoltaic array, described photovoltaic water-raising system also comprises the above-mentioned photovoltaic water-raising inverter be connected between described water pump and photovoltaic array.
According to a further aspect in the invention, a kind of control method of photovoltaic water-raising inverter is provided, described photovoltaic water-raising inverter to be connected between water pump and photovoltaic array and to have MPPT function, and described method comprises: in described photovoltaic water-raising inverter, carry out boosting rectifier control and inversion control;
Described boosting rectifier control refers to adopt booster circuit that the output voltage of described photovoltaic array is promoted to DC bus-bar voltage, and
Described inversion control refers to adopt inverter circuit to carry out DC/AC conversion to described DC bus-bar voltage and export the alternating voltage driving described water pump.
In the control method of above-mentioned photovoltaic water-raising inverter (2), described method is also included in described photovoltaic water-raising inverter carries out MPPT control and a first DC bus-bar voltage Isobarically Control;
A described MPPT controls to comprise: the output voltage and the output current that gather described photovoltaic array, in order to regulate and control the conducting duty ratio of described booster circuit, and then regulates and controls the DC bus-bar voltage of described booster circuit generation;
Described first DC bus-bar voltage Isobarically Control comprises: the comparative result based on the DC bus-bar voltage steady state value preset and described DC bus-bar voltage carries out PWM control to described inverter circuit, to regulate and control the alternating voltage that described inverter circuit exports.
In the control method of above-mentioned photovoltaic water-raising inverter, described method is also included in described photovoltaic water-raising inverter carries out the 2nd MPPT control, constant boosting rectifier control and the second DC bus-bar voltage Isobarically Control;
Described 2nd MPPT controls to comprise: the output voltage and the output current that gather described photovoltaic array, and carries out PWM control to described inverter circuit, to regulate and control the alternating voltage that described inverter circuit exports;
Described constant boosting rectifier control comprises: the output frequency based on described inverter circuit calculates the first DC bus-bar voltage reference value;
Described second DC bus-bar voltage Isobarically Control comprises: the comparative result based on DC bus-bar voltage steady state value and the described DC bus-bar voltage preset regulates and controls the conducting duty ratio of described booster circuit, to regulate and control the DC bus-bar voltage of described booster circuit generation.
In the control method of above-mentioned photovoltaic water-raising inverter, described method is also included in described photovoltaic water-raising inverter carries out the 2nd MPPT control, dynamically boosted control and the 3rd DC bus-bar voltage Isobarically Control;
Described 2nd MPPT controls to comprise: the output voltage and the output current that gather described photovoltaic array, and carries out PWM control to described inverter circuit, to regulate and control the alternating voltage that described inverter circuit exports;
Described dynamically boosted control comprises: based on the output frequency setting minimum direct current busbar voltage reference value of described inverter circuit;
Described 3rd DC bus-bar voltage Isobarically Control comprises: the comparative result based on described minimum direct current busbar voltage reference value and described DC bus-bar voltage regulates and controls the conducting duty ratio of described booster circuit, to regulate and control the DC bus-bar voltage that described booster circuit produces.
Implement photovoltaic water-raising inverter of the present invention and control method thereof, following beneficial effect can be obtained: in practical application, first the booster circuit of inverter can make the direct current of photovoltaic array export lifting before carrying out DC/AC conversion, therefore the range of choices of photovoltaic array output voltage is made to broaden, and then the configuration requirement reduced assembly each in photovoltaic array, make the configuration of the photovoltaic water-raising system containing this photovoltaic DC-to-AC converter more flexible.On the other hand, the combination of boosting and inversion and MPPT function can realize the control mode of multiple photovoltaic DC-to-AC converter, is convenient to optimize control effectively to its power output and voltage transitions performance.
Accompanying drawing explanation
Below with reference to the drawings and specific embodiments, invention is described in further details.In accompanying drawing:
Fig. 1 is the schematic diagram of typical photovoltaic water-raising system;
Fig. 2 is that stage photovoltaic single of the prior art pumps up water the structure chart of inverter;
Fig. 3 a is the structure chart according to two-stage type photovoltaic water-raising inverter of the present invention;
Fig. 3 b is the flow chart controlled two-stage type photovoltaic water-raising inverter of the present invention;
Fig. 4 a is the structured flowchart of the photovoltaic water-raising inverter according to the embodiment of the present invention 1;
Fig. 4 b is the flow chart controlled the photovoltaic water-raising inverter of the embodiment of the present invention 1;
Fig. 5 a is the structured flowchart of the photovoltaic water-raising inverter according to the embodiment of the present invention 2;
Fig. 5 b is the flow chart controlled the photovoltaic water-raising inverter of the embodiment of the present invention 2;
Fig. 5 c is the schematic diagram of dynamic DC bus-bar voltage reference value curve in the embodiment of the present invention 2;
Fig. 6 a is the structured flowchart of the photovoltaic water-raising inverter according to the embodiment of the present invention 3; And
Fig. 6 b is the flow chart controlled the photovoltaic water-raising inverter of the embodiment of the present invention 3.
Embodiment
For making object of the present invention, technical scheme and effect clearer, below with reference to the drawings and specific embodiments, the present invention is described in further details.It should be understood that following examples only in order to explain the present invention, and any restriction is not done to the present invention.
The invention provides a kind of photovoltaic water-raising system, it comprises photovoltaic array 1, photovoltaic water-raising inverter 2 and the water pump 3 (Fig. 1) be electrically connected successively.Wherein, photovoltaic water-raising inverter 2 completes DC-AC conversion between photovoltaic array 1 and water pump 3, is used for driving water pump 3 (especially three-phase alternating current water pump) after conversion with the direct voltage produced by photovoltaic array 1.The photovoltaic water-raising inverter adopted in the photovoltaic water-raising system of the application will be discussed in detail below.
The invention provides a kind of photovoltaic water-raising inverter (hereinafter referred to as inverter) 2 with MPPT function, as shown in Figure 3 a, it comprises booster circuit 21 and inverter circuit 22.The output voltage of photovoltaic array 1 is promoted to DC bus-bar voltage V by booster circuit 21
bus, and inverter circuit 22 couples of DC bus-bar voltage V
buscarry out DC/AC conversion and export the alternating voltage driving water pump 3.The control method corresponding with this inverter, see Fig. 3 b, wherein completes boosting rectifier control and inversion control respectively in step S1 and step S2.The inverter of this two-stage type structure greatly can reduce the configuration requirement to assembly in photovoltaic array 1, solves the free matching problem of photovoltaic array 1 output voltage and water pump 3 electric moter voltage, and then improves the flexibility of whole photovoltaic water-raising system.In actual applications, this two-stage type inverter can make the range of choices of photovoltaic array 1 output voltage broaden.Such as, mate with 220V water pump photovoltaic water-raising system, allow photovoltaic array 1 maximum power point voltage to be 100 ~ 350V; The photovoltaic water-raising system mated with 380V water pump, allows photovoltaic array 1 maximum power point voltage to be 200 ~ 600V; Obviously, the system design and confuration of system has greater flexibility.
Because inverter 2 of the present invention has boosting and inversion two power conversion links, boosting, inversion and MPPT tri-controlling functions are needed.Boosting rectifier control and inversion control are completed by booster circuit 21 and inverter circuit 22 respectively, and MPPT function then can be selected to perform in different links, therefore can be combined to form multiple control modes.
Embodiment 1:
See Fig. 4 a and 4b, in embodiments of the invention 1, this inverter 2 with MPPT function not only comprises booster circuit 21 and inverter circuit 22, also comprises the second MPPT controller 25, constant boost pressure controller 26 and the second DC bus-bar voltage constant-voltage controller 27.As mentioned above, booster circuit 21 and inverter circuit 22 realize boosting rectifier control and inversion control respectively in inverter 2, and its excess-three assembly then carries out matching regulation and control to boosting link and inversion link further.
Second MPPT controller 25 is connected with photovoltaic array 1 and inverter circuit 22, alternating voltage for exporting inverter circuit 22 regulates and controls, and then the power output of direct regulation and control inverter circuit 22 (according to energy balance relations, the power output of inverter circuit and the input power P of water pump
2equal; Therefore, the second MPPT controller is equivalent to the input power P to water pump
2carry out direct regulation and control).In other words, first MPPT is controlled to be arranged on inversion link in embodiment 1.Second MPPT controller 25 gathers the output voltage V of photovoltaic array 1
pVwith output current I
pV, according to MPPT algorithm, PWM control is carried out to inverter circuit 22, also namely directly regulates the output frequency f of inverter circuit 22 according to MPPT algorithm.Such as, disturbance observation can be adopted to determine the adjustment direction of next cycle output frequency f according to the change of the power output of inverter circuit.
f(n
1)=f(n
1-1)+△f(n
1)(1)
In formula (1) and (2), △ f represents that output frequency regulates step-length, n
1mPPT control cycle residing for expression.
Constant boost pressure controller 26 gathers the output frequency f regulated and controled by the second MPPT controller 25, and (namely control power P according to the alternating voltage that VVVF (variable-voltagevariable-frequency, variable voltage variable frequency) the control principle calculating inverter circuit 22 of motor exports
2, complete inversion control) and the first DC bus-bar voltage reference value V
ref2.The the first DC bus-bar voltage reference value V now obtained
ref2it is a steady state value.Such as, the first DC bus-bar voltage reference value V mated with 220V water pump
ref2for 320V, that mate with 380V water pump is then 540V.
Second DC bus-bar voltage constant-voltage controller 27 is connected with constant boost pressure controller 26 and booster circuit 21, and it detects the DC bus-bar voltage V that booster circuit 21 exports simultaneously
buswith the first DC bus-bar voltage reference value V that constant boost pressure controller 26 calculates
ref2, and the conducting duty ratio D of booster circuit 21 is regulated according to both relative size.By can make the power output P of photovoltaic array 1 to the regulation and control of conducting duty ratio D
1reach the maximum power P that can export
max, therefore also achieve the DC bus-bar voltage V that booster circuit 21 is produced
busregulation and control, the stability of DC bus-bar voltage in raising system.
In the inverter of embodiment 1, boosting link carries out inner ring voltage stabilizing control, is electric energy-electric energy conversion, fast response time; Inversion link carries out open sea wharf (MPPT), and for electric energy-mechanic can be changed, response speed is slow.This inner ring fast period controls, the double-closed-loop control of the slow periodic Control of outer shroud, makes P
1follow P
2change, ensure that the stability of system cloud gray model.Boosting link is implemented corresponding boosting and is controlled with voltage stabilizing, thus makes P
1follow P
2change.
To the concrete control method of the inverter 2 of this embodiment in fig 3b clearly.See Fig. 3 b, in the process producing required interchange output:
The output voltage V of step S11, first detection photovoltaic array 1
pvwith output current I
pv, carry out boosting rectifier control and MPPT control subsequently respectively.
Step S12a, the output voltage V will detected in booster circuit 21
pvbe promoted to DC bus-bar voltage V
bus, complete boosting rectifier control.
Step S12b, adopt MPPT algorithm according to the power output P1 of photovoltaic array 1 (by output voltage V
pvwith output current I
pvdetermine) regulation and control inverter circuit 22 output frequency f.After obtaining output frequency f, VVVF control principle is adopted to calculate output voltage (the step 13b of inverter circuit respectively further
1) and the first DC bus-bar voltage reference value V
ref2(step 13b
2).The first DC bus-bar voltage reference value V that the present embodiment calculates
ref2for steady state value.
Step S14, based on the first DC bus-bar voltage reference value V
ref2with DC bus-bar voltage V
busrelative size, regulate the conducting duty ratio D of booster circuit, and then by regulating the power output P of photovoltaic array 1
1the DC bus-bar voltage V that regulation and control booster circuit 21 exports
bus, complete Isobarically Control.
Embodiment 2:
See Fig. 5 a-5c, in embodiments of the invention 2, this inverter 2 with MPPT function not only comprises booster circuit 21 and inverter circuit 22, also comprises the second MPPT controller 25, dynamically boosted controller 28 and the 3rd DC bus-bar voltage constant-voltage controller 29.As mentioned above, booster circuit 21 and inverter circuit 22 realize boosting rectifier control and inversion control respectively in inverter 2, and its excess-three assembly then carries out matching regulation and control to boosting link and inversion link further.Embodiment 1 is substantially identical with the control procedure of the inverter in 2, except the dynamically boosted controller 28 adopted in embodiment 2 can realize except dynamically boosted control.Therefore, only just the impact of dynamically boosted controller 28 on inverter control is described below, and other control procedures are see embodiment 1.
Dynamically boosted controller 28 gathers the output frequency f regulated and controled by the second MPPT controller 25, and (namely controls power P according to the alternating voltage that the VVVF control principle calculating inverter circuit 22 of motor exports
2, complete inversion control), and dynamic calculation goes out to produce the minimum direct current busbar voltage needed for this alternating voltage further, in this, as the minimum direct current busbar voltage reference value V in Isobarically Control
ref3.The minimum direct current busbar voltage reference value V now obtained
ref3it is the minimum value of an adaptation.
For simplifying control treatment process, the present invention is directed to the water pump of different rated voltage, setting the reference value V of dynamic electric voltage as shown in Figure 5 c
ref-f curve.Boosting rectifier control link detects V simultaneously
pvand V
bus, work as V
pv>=V
reftime, the switching tube S1 of booster circuit keeps off state, and booster circuit quits work, V
bus≈ V
pv; Work as V
pv<V
reftime, switching tube S1 does PWM, and booster circuit is implemented DC bus-bar voltage with V
ref3for the boosting of target and voltage stabilizing control, the calculating formula of conducting duty ratio is
D(n
2)=D(n
2-1)+k
D[V
bus(n
2)-V
ref］(3)
In formula, k
drepresent duty cycle adjustment coefficient, n
2the voltage control cycle residing for expression.
In flow chart 5b, the difference of embodiment 2 is then embodied in step 23
b2: after obtaining output frequency f, adopt VVVF control principle to calculate minimum direct current busbar voltage reference value V further
ref3.The minimum direct current busbar voltage reference value V that the present embodiment calculates
ref3the minimum value of one adaptation.Certainly, the Isobarically Control link of carrying out subsequently is also based on this minimum direct current busbar voltage reference value V
ref3carry out relevant control.
In the inverter of embodiment 1 and 2, outer shroud MPPT controls can according to the power output P of photovoltaic array 1
1the output frequency f of regulation and control inverter circuit, and then regulate the input power P of water pump
2; In other words, in the above two embodiments, power P
1and P
2there is direct correlation.Meanwhile, boosting rectifier control link only for realizing the control of DC bus-bar voltage, improves the stability of DC bus-bar voltage.Embodiment 1 and 2 is the preferred embodiments of the present invention.
Embodiment 3:
With above-mentioned two embodiments unlike, carry out MPPT control in boosting rectifier control link in embodiment 3, carry out busbar voltage Isobarically Control in inversion control link.Specifically as shown in Fig. 6 a-6b, this inverter 2 with MPPT function not only comprises booster circuit 21 and inverter circuit 22, also comprises the first MPPT controller 23 and the first DC bus-bar voltage constant-voltage controller 24.As mentioned above, booster circuit 21 and inverter circuit 22 realize boosting rectifier control and inversion control respectively in inverter 2, and all the other two assemblies then carry out matching regulation and control to boosting link and inversion link further.
First MPPT controller 23 is connected with photovoltaic array 1 and booster circuit 21, for regulating and controlling the conducting duty ratio D of booster circuit 21, and then the power output P of regulation and control photovoltaic array 1
1.In other words, first MPPT is controlled to be arranged on boosting link in embodiment 1.First MPPT controller 23 gathers the output voltage V of photovoltaic array 1
pVwith output current I
pV, according to MPPT algorithm, booster circuit 21 is carried out to the control of conducting duty ratio D.Such as, disturbance observation (one in traditional MPPT algorithm) is adopted, according to photovoltaic array power output P
1change direction determine the adjustment direction of conducting duty ratio D in next MPPT control cycle, thus make P
1reach the maximum power P that photovoltaic array can export
max.
D(n
1)=D(n
1-1)+△D(n
1)(4)
In formula, △ D represents duty cycle adjustment step-length, n
1mPPT control cycle residing for expression.
First DC bus-bar voltage constant-voltage controller 24 is connected with booster circuit 21 and inverter circuit 22, and it detects the DC bus-bar voltage V that booster circuit 21 exports
bus, and according to the DC bus-bar voltage steady state value V preset set
ref1with DC bus-bar voltage V
busrelative size regulate the output frequency f of inverter circuit 22, thus make DC bus-bar voltage V
busbe stabilized to the desired value V of setting
ref1.
In the Isobarically Control that the first DC bus-bar voltage constant-voltage controller 24 is implemented, according to energy balance relations, the input power of inverter 2 and the power output P of photovoltaic array 1
1equal, the power output of inverter 2 and the input power P of water pump 3
2equal.P
1with P
2magnitude relationship determine the variation tendency of DC bus-bar voltage.As the power output P of photovoltaic array 1
1the input power P of > water pump 3
2time, bus capacitor C charges, and DC bus-bar voltage raises; Otherwise bus capacitor C discharges, DC bus-bar voltage reduces; As the power output P of photovoltaic array 1
1the input power P of=water pump 3
2time, power-balance, DC bus-bar voltage remains unchanged.Due to the input power P of water pump
2substantially be directly proportional to the cube of its rotating speed, so inversion control link is first according to the DC bus-bar voltage V detected
buswith the steady state value V of its setting
ref1relative size regulate the output frequency f of inverter circuit 22, thus make DC bus-bar voltage V
busbe stabilized to the desired value V of setting
ref1.
f(n
2)=f(n
2-1)+k
f［V
bus(n
2)-V
ref](6)
In formula, k
frepresent Frequency regulation factor, n
2output frequency control cycle residing for expression.After output frequency f determines, inversion link again according to the VVVF control principle of motor, export determine the alternating voltage of frequency and size.
In embodiment 3, because boosting rectifier control link regulates the power output P of photovoltaic array
1, be electric energy-electric energy conversion, fast response time; And inversion control link regulates the input power P of water pump
2, for electric energy-mechanic can be changed, response speed is slow.Two links all have an impact to DC bus-bar voltage, and attempt to maintain the stable of DC bus-bar voltage by the inversion link that response speed is slow, DC bus-bar voltage must be caused to occur fluctuation to a certain degree, therefore in the control of the stability of a system not as good as embodiment 1 and 2.In addition, with embodiment 1 and 2 unlike, the power output P of photovoltaic array in this embodiment
1with the input power P of water pump
2without direct correlation.
To the concrete control method of the inverter 2 of this embodiment as shown in Figure 6 b.See Fig. 6 b, in the process producing required interchange output:
The output voltage V of step S31, first detection photovoltaic array 1
pvwith output current I
pv, in subsequent step, carry out boosting rectifier control and MPPT control subsequently respectively.
Step S32, the output voltage V will detected in booster circuit 21
pvbe promoted to DC bus-bar voltage V
bus, complete boosting rectifier control.Simultaneously at branch road step S32
1adopt MPPT algorithm according to the power output P1 of photovoltaic array 1 (by output voltage V
pvwith output current I
pvdetermine) regulation and control booster circuit 21 conducting duty ratio D, boosting rectifier control link realize simultaneously MPPT control.
Step S33, in inverter circuit 22, DC/AC conversion is carried out to DC bus-bar voltage Vbus, obtain the alternating voltage exporting water pump to.Simultaneously at branch road step S33
1based on the DC bus-bar voltage steady state value V of setting
ref1with DC bus-bar voltage V
busrelative size, regulate the output frequency f of inverter circuit 22, realize Isobarically Control in inversion control link simultaneously.The closed-loop control of this step is the common adjustment (shown in dotted line) of the power output P1 of boosting rectifier control link and the P2 of inversion control link to DC bus-bar voltage.
The foregoing is only the preferred embodiments of the present invention, its object does not also lie in the present invention's restriction or is constrained in above-mentioned implementation.All any amendments of making the present invention within the scope of the invention and replacing all should be included in the scope of the claims in the present invention.
Claims (6)
1. a photovoltaic water-raising inverter (2), to be connected between water pump (3) and photovoltaic array (1) and there is MPPT maximum power point tracking (MPPT) function, it is characterized in that, described photovoltaic water-raising inverter (2) comprises booster circuit (21) and inverter circuit (22); The output voltage of described photovoltaic array (1) is promoted to DC bus-bar voltage (V by described booster circuit (21)
bus), described inverter circuit (22) is to described DC bus-bar voltage (V
bus) carry out DC/AC conversion and export the alternating voltage driving described water pump (3);
Described photovoltaic water-raising inverter (2) also comprises the second MPPT controller (25), constant boost pressure controller (26) and the second DC bus-bar voltage constant-voltage controller (27);
Described second MPPT controller (25) gathers the output voltage (V of described photovoltaic array (1)
pV) and output current (I
pV), in order to carry out PWM control to described inverter circuit (22), to regulate and control the alternating voltage that described inverter circuit (22) exports;
Described constant boost pressure controller (26) based on regulate and control by described second MPPT controller (25), the output frequency of described inverter circuit (22), for calculating the first DC bus-bar voltage reference value (V
ref2);
Described second DC bus-bar voltage constant-voltage controller (27) is based on the first DC bus-bar voltage reference value (V
ref2) and described DC bus-bar voltage (V
bus) comparative result regulate and control the conducting duty ratio (D) of described booster circuit (21), to regulate and control the DC bus-bar voltage (V that described booster circuit (21) produces
bus).
2. a photovoltaic water-raising inverter (2), to be connected between water pump (3) and photovoltaic array (1) and there is MPPT maximum power point tracking (MPPT) function, it is characterized in that, described photovoltaic water-raising inverter (2) comprises booster circuit (21) and inverter circuit (22); The output voltage of described photovoltaic array (1) is promoted to DC bus-bar voltage (V by described booster circuit (21)
bus), described inverter circuit (22) is to described DC bus-bar voltage (V
bus) carry out DC/AC conversion and export the alternating voltage driving described water pump (3);
Described photovoltaic water-raising inverter (2) also comprises the second MPPT controller (25), dynamically boosted controller (28) and the 3rd DC bus-bar voltage constant-voltage controller (29);
Described second MPPT controller (25) gathers the output voltage (V of described photovoltaic array (1)
pV) and output current (I
pV), in order to carry out PWM control to described inverter circuit (22), to regulate and control the alternating voltage that described inverter circuit (22) exports;
Described dynamically boosted controller (28) receives output frequency that regulate and control by described second MPPT controller (25), described inverter circuit (22), in order to set minimum direct current busbar voltage reference value (V
ref3);
Described 3rd DC bus-bar voltage constant-voltage controller (28) is based on described minimum direct current busbar voltage reference value (V
ref3) and described DC bus-bar voltage (V
bus) comparative result regulate and control the conducting duty ratio (D) of described booster circuit (21), to regulate and control the DC bus-bar voltage (V that described booster circuit (21) produces
bus).
3. photovoltaic water-raising inverter (2) according to claim 1 and 2, is characterized in that, the switching tube of described booster circuit (21) and inverter circuit (22) all adopts IGBT switching tube.
4. a photovoltaic water-raising system (100), comprise water pump (3) and photovoltaic array (1), it is characterized in that, described photovoltaic water-raising system (100) also comprises the photovoltaic water-raising inverter (2) as claim arbitrary in claim 1-2 be connected between described water pump (3) and photovoltaic array (1).
5. the control method of a photovoltaic water-raising inverter (2), described photovoltaic water-raising inverter (2) to be connected between water pump (3) and photovoltaic array (1) and to have MPPT maximum power point tracking (MPPT) function, it is characterized in that, described method comprises: in described photovoltaic water-raising inverter (2), carry out boosting rectifier control and inversion control;
Described boosting rectifier control refers to adopt booster circuit (21) that the output voltage of described photovoltaic array (1) is promoted to DC bus-bar voltage (V
bus), and
Described inversion control refers to adopt inverter circuit (22) to described DC bus-bar voltage (V
bus) carry out DC/AC conversion and export the alternating voltage driving described water pump (3);
Described method is also included in described photovoltaic water-raising inverter carries out the 2nd MPPT control, constant boosting rectifier control and the second DC bus-bar voltage Isobarically Control;
Described 2nd MPPT controls to comprise: the output voltage (V gathering described photovoltaic array (1)
pV) and output current (I
pV), and PWM control is carried out to described inverter circuit (22), to regulate and control the alternating voltage that described inverter circuit (22) exports;
Described constant boosting rectifier control comprises: the output frequency based on described inverter circuit (22) calculates the first DC bus-bar voltage reference value (V
ref2);
Described second DC bus-bar voltage Isobarically Control comprises: based on the first DC bus-bar voltage reference value (V
ref2) and described DC bus-bar voltage (V
bus) comparative result regulate and control the conducting duty ratio (D) of described booster circuit (21), to regulate and control the DC bus-bar voltage (V that described booster circuit (21) produces
bus).
6. the control method of a photovoltaic water-raising inverter (2), described photovoltaic water-raising inverter (2) to be connected between water pump (3) and photovoltaic array (1) and to have MPPT maximum power point tracking (MPPT) function, it is characterized in that, described method comprises: in described photovoltaic water-raising inverter (2), carry out boosting rectifier control and inversion control;
Described boosting rectifier control refers to adopt booster circuit (21) that the output voltage of described photovoltaic array (1) is promoted to DC bus-bar voltage (V
bus), and
Described inversion control refers to adopt inverter circuit (22) to described DC bus-bar voltage (V
bus) carry out DC/AC conversion and export the alternating voltage driving described water pump (3);
Described method is also included in described photovoltaic water-raising inverter carries out the 2nd MPPT control, dynamically boosted control and the 3rd DC bus-bar voltage Isobarically Control;
Described 2nd MPPT controls to comprise: the output voltage (V gathering described photovoltaic array (1)
pV) and output current (I
pV), and PWM control is carried out to described inverter circuit (22), to regulate and control the alternating voltage that described inverter circuit (22) exports;
Described dynamically boosted control comprises: based on the output frequency setting minimum direct current busbar voltage reference value (V of described inverter circuit (22)
ref3);
Described 3rd DC bus-bar voltage Isobarically Control comprises: based on described minimum direct current busbar voltage reference value (V
ref3) and described DC bus-bar voltage (V
bus) comparative result regulate and control the conducting duty ratio (D) of described booster circuit (21), to regulate and control the DC bus-bar voltage (V that described booster circuit (21) produces
bus).
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| KR101964627B1 (en) * | 2014-11-18 | 2019-04-02 | 엘에스산전 주식회사 | System for water supply using sunlight |
| CN105840449B (en) * | 2015-01-16 | 2018-04-13 | 昆明五威科工贸有限公司 | A kind of collocation method of photovoltaic water-raising system |
| KR101881730B1 (en) * | 2016-12-14 | 2018-07-25 | 엘에스산전 주식회사 | Method for controlling inverter in solar pump system |
| CN106593842A (en) * | 2016-12-29 | 2017-04-26 | 上海新时达电气股份有限公司 | Water pump driving method and device |
| CN106712643B (en) * | 2016-12-29 | 2019-06-21 | 上海新时达电气股份有限公司 | Photovoltaic water pump control method and device |
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Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili nine Xiang Ling Industrial Zone nine building four floor Patentee after: Shenzhen Solartech Renewable Energy Co., Ltd. Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili nine Xiang Ling Industrial Zone nine building four floor Patentee before: Shenzhen Solartech Renewable Energy CO., Ltd. |