CN104917361B - Inverter and its control method - Google Patents

Inverter and its control method Download PDF

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Publication number
CN104917361B
CN104917361B CN201510083340.XA CN201510083340A CN104917361B CN 104917361 B CN104917361 B CN 104917361B CN 201510083340 A CN201510083340 A CN 201510083340A CN 104917361 B CN104917361 B CN 104917361B
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voltage
input
current
inverter
magnitude
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CN201510083340.XA
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CN104917361A (en
Inventor
陈汉威
游俊豪
刘家桦
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FSP Technology Inc
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FSP Technology Inc
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Electronic Switches (AREA)

Abstract

The invention discloses a kind of inverter, the inverter includes inverter circuit, circuit for detecting and control circuit, control circuit couples inverter circuit and circuit for detecting, inverter circuit is controlled to provide control signal, uses and adjusts the magnitude of voltage of input voltage to the command voltage representated by control signal.The input voltage and the voltage difference of command voltage that wherein control circuit calculating circuit for detecting is detected, to judge whether voltage difference is more than default value.When control circuit judges that voltage difference is more than default value, the magnitude of voltage of setting command voltage is equal to the magnitude of voltage of current input voltage.The problem of inverter of the present invention be when can prevent the fan-out capability of the DC power supply generation device of front end from changing suddenly, and inverter can not in time react and cause the system failure.

Description

Inverter and its control method
Technical field
The present invention relates to a kind of power converter topology, more particularly to a kind of inverter and its control method.
Background technology
In order to reduce the consumption rate of fossil energy, the application of the development renewable sources of energy of electric system actively now.Such as With solar energy produce power supply optical-electric module (photovoltaic module), with wind energy produce power supply wind power generation module, The hydroelectric generation module of power supply or other kinds of renewable source of energy generation module are produced with current.However, the above-mentioned renewable sources of energy Electricity generation module due to being generated electricity using natural resources, its characteristics of output power/fan-out capability can significantly by Changed to the influence of environment.
For example, by taking the DC power supply generation device of optical-electric module (such as solar panels) power generation as an example, weather condition, Other possible external condition changes such as shielded situation of solar panels, are all likely to result in direct current caused by optical-electric module Power characteristic/fan-out capability of power supply changes.
Since the DC power supply generation device that such renewable source of energy generation module is formed largely all has fan-out capability The problem of unstable, therefore when such DC power supply generation device is applied to AC power supply system, the inverter of rear end The adjustment in design need to be made in response to this problem.Otherwise, if the inverter of rear end can not be directed to the DC power supply of front end The power characteristic of generation device, which changes, timely makes a response, for example, input voltage and command voltage difference it is excessive, then usually can The problem of causing the input voltage of inverter can not follow excessive command voltage and cause the system failure.
Therefore, it is necessary to a kind of inverter and its control method to solve the problems, such as above-mentioned to exist.
The content of the invention
The present invention a purpose be to provide a kind of inverter, which can prevent the DC power supply of front end from producing When the fan-out capability of generating apparatus changes suddenly, the problem of inverter can not in time react and cause the system failure.
Another object of the present invention is to provide a kind of control method of inverter, the control method energy of the inverter When enough preventing the fan-out capability of the DC power supply generation device of front end from changing suddenly, inverter can not in time be reacted and made The problem of into the system failure.
To achieve these goals, the present invention provides a kind of inverter, including：
One inverter circuit, receives a direct-current input power supplying, the direct-current input power supplying is converted to exchange output Power supply；
One circuit for detecting, to detect an input voltage of the direct-current input power supplying and an input current；And
One control circuit, couples the inverter circuit and the circuit for detecting, to provide a control signal to control Inverter circuit is stated, uses and adjusts the magnitude of voltage of the input voltage to the command voltage representated by the control signal,
Wherein, the control circuit calculates a voltage difference of the input voltage and command voltage detected, and Judge whether the voltage difference is more than a default value,
When the control circuit judges that the voltage difference is more than the default value, the voltage of the command voltage is set Value is equal to the magnitude of voltage of the current input voltage.
It is preferred that the control circuit includes：
One maximum power point tracking computing module, to sample the input voltage and the input current, described in calculating Voltage difference produces a disturbing signal to judge whether the voltage difference is more than the default value according to judging result；
One adder, couples the maximum power point tracking computing module, receives the disturbing signal and a reference signal And the command voltage is produced according to the disturbing signal and the reference signal, wherein the command voltage is the disturbance The magnitude of voltage of the command voltage of the previous time point representated by a disturbance quantity and the reference signal representated by signal is folded Add；And
One drive circuit, receives the command voltage and produces the control signal according to the command voltage.
It is preferred that when the maximum power point tracking computing module judges that the voltage difference is less than or equal to the default value When, the maximum power point tracking computing module adjusts the disturbing signal based on a maximum power point tracking computing.
It is preferred that when carrying out the maximum power point tracking computing, the maximum power point tracking computing module foundation The input voltage calculates an input power with the input current, when the control circuit judges that the voltage difference is less than When the default value, the maximum power point tracking computing module comes described in modulation by the front and rear input power of disturbance is compared Disturbance quantity, uses and produces corresponding disturbing signal, to make the input power level off to a maximal input.
It is preferred that if the input power of current point in time is more than the input power of previous time point, the maximum power point Follow the trail of computing module and the disturbance quantity identical with the perturbation direction under previous time point be provided, and if current point in time input Power is less than or equal to the input power of previous time point, under the maximum power point tracking computing module offer and previous time point The opposite disturbance quantity of perturbation direction.
Compared with prior art, inverter of the invention can be by the voltage difference for calculating input voltage and command voltage Value, and whether comparison voltage difference judges whether the power characteristic of direct-current input power supplying occurs partially more than the mode of default value Move.Wherein, when the power characteristic for judging direct-current input power supplying shifts, command voltage is set as to current input electricity Pressure, using prevents input voltage from can not follow excessive command voltage and causing the system failure.So that the inverter of the present invention When can prevent the fan-out capability of the DC power supply generation device of front end from changing suddenly, inverter can not react in time and The problem of causing the system failure.
In order to realize another object of the present invention, the present invention provides a kind of control method of inverter, suitable for chasing after One maximal input of the direct-current input power supplying that inverter described in track is received, wherein, the control method includes：
Detect an input voltage and an input current for the direct-current input power supplying；
A control signal is provided to control the input voltage, uses and adjusts the magnitude of voltage of the input voltage to described A command voltage representated by control signal；
Calculate a voltage difference of the input voltage and command voltage detected；
Judge whether the voltage difference is more than a default value；And
When the voltage difference is more than the default value, the magnitude of voltage for setting the command voltage is equal to currently described The magnitude of voltage of input voltage.
It is preferred that providing the control signal to control the input voltage, use the magnitude of voltage of the input voltage Adjusting to the step of command voltage representated by the control signal includes：
The disturbing signal for representing a disturbance quantity is provided；
The disturbing signal is superimposed to a reference signal, the life is produced according to the disturbing signal and the reference signal Voltage is made, wherein representated by the disturbance quantity and the reference signal of the command voltage representated by the disturbing signal The superposition of the magnitude of voltage of the command voltage of one previous time point；And
The control signal is produced according to the command voltage.
It is preferred that the control method of the inverter further includes：
When the voltage difference is less than or equal to the default value, adjusted based on a maximum power point tracking computing described Disturbing signal.
It is preferred that based on the maximum power point tracking computing to adjust the disturbing signal the step of include：
An input power is calculated according to the input voltage and the input current；
Compare the front and rear input power of disturbance；And
According to disturbance quantity described in a comparative result modulation, use and produce the corresponding disturbing signal, to make the input Power levels off to a maximal input.
It is preferred that according to disturbance quantity described in the comparative result modulation, use make the input power level off to it is described most The step of big input power, includes：
Judge whether the input power of current point in time is more than the input power of previous time point；
If the input power of current point in time is more than the input power of previous time point, there is provided with one under previous time point The identical disturbance quantity of perturbation direction；And
If the input power of current point in time be less than or equal to previous time point input power, there is provided with previous time point The opposite disturbance quantity of perturbation direction.
Compared with prior art, the control method of inverter of the invention can be by calculating input voltage and command voltage Voltage difference, and comparison voltage difference whether more than the mode of default value be to judge the power characteristic of direct-current input power supplying It is no to shift.Wherein, when the power characteristic for judging direct-current input power supplying shifts, command voltage is set as current Input voltage, using prevents input voltage from can not follow excessive command voltage and causing the system failure.So that the present invention's is inverse When becoming the control method of device can prevent the fan-out capability of the DC power supply generation device of front end from changing suddenly, inversion dress Put the problem of can not in time reacting and causing the system failure.
Brief description of the drawings
Fig. 1 is the schematic diagram of the inverter of one embodiment of the invention.
The schematic diagram of the control circuit of Fig. 2 one embodiment of the invention.
Fig. 3 is the voltage-current relation schematic diagram of the direct-current input power supplying of one embodiment of the invention.
Fig. 4 is the when m- voltage relationship schematic diagram of the direct-current input power supplying of one embodiment of the invention.
Fig. 5 is the step flow chart of the control method of the inverter of one embodiment of the invention.
【Symbol description】
100：Inverter
110：Inverter circuit
120：Circuit for detecting
130：Control circuit
131：MPPT computing modules
132：Adder
133：Drive circuit
ACout：Exchange out-put supply
CV1、CV2：Characteristic curve
DCin：Direct-current input power supplying
DCG：DC power supply generation device
EG：Power grid
I1、I1’、I1”、I1”’：Current value
Iout：Output current
Iin：Input current
S410~S470：Step
Sc：Control signal
Sc’：Reference signal
Sd：Disturbing signal
t0、t1、t2：Time point
V1、V1’、V1”、V1”’、V2、Vp：Magnitude of voltage
Vcmd、Vcmd’：Command voltage
Vout：Output voltage
Vin、Vin’：Input voltage
Vth：Acquiescence is hung
ΔV：Disturbance quantity
Embodiment
In order to allow disclosed herein content easily understood, below especially exemplified by embodiment as the invention discloses The example that can actually implement according to this.In addition, all possible parts, use the group of identical label in schema and embodiment Part/component/step, represents same or like component.
Fig. 1 is the schematic diagram of the inverter of one embodiment of the invention.It refer to Fig. 1, the inverter 100 of the present embodiment It is suitable for application in an AC power supply system.In the AC power supply system, inverter 100 can be from the DC power supply of front end Generation device DCG reception direct-current input power supplyings DCin (input voltage vin and input current Iin that include direct current), and according to Exchange out-put supply ACout, which is produced, according to direct-current input power supplying DCin (includes the output voltage Vout and output current of exchange Iout) it is supplied to the power grid EG of rear end.In this, the DC power supply generation device DCG may be selected to be optical-electric module (photovoltaic module), wind power generation module, hydroelectric generation module or other kinds of renewable source of energy generation module, The present invention is not limited.
In the present embodiment, inverter 100 includes inverter circuit 110, circuit for detecting 120 and control circuit 130.Inversion Circuit receives direct-current input power supplying DCin, and direct-current input power supplying is converted to exchange out-put supply ACout.Wherein, The circuit configurations of the inverter circuit 110 may be selected to be half-bridge asymmetric, half-bridge symmetrical, full-bridge type or other are feasible inverse Become circuit configurations, the present invention is any limitation as not to this.
Circuit for detecting 120 couples the input terminal of inverter circuit 110 to detect the input voltage vin of direct-current input power supplying DCin With input current Iin, and the information of the input voltage vin detected and input current Iin are exported to control circuit 130 As the foundation of control.
Control circuit 130 couples inverter circuit 110 and detects lateral circuit 120.Control circuit 130 is controlling inverter circuit 110 power supply conversion and the input voltage vin size of direct-current input power supplying DCin, use the DC power supply generation device for making front end The utilization rate of DCG all maintains certain degree.For example, it is inverse to control can to produce a control signal Sc for control circuit 130 The direct current of change circuit 110 is delivered circulation and is changed, and the control signal Sc may be selected to be to control the switching cycle of inverter circuit 110 A pulse-width modulation signal (PWM signal), but the present invention is not limited.On the other hand, control circuit 130 may also provide One disturbing signal Sd carrys out the magnitude of voltage size of disturbance input voltage Vin, uses and realizes maximum power point tracking (maximum Power point tracking, MPPT) controlling mechanism so that the output power of the DC power supply generation device DCG of front end The maximum power that can be leveled off in specification.
Specifically, the inverter circuit 110 of the present embodiment can be according to received control signal Sc and by input voltage The magnitude of voltage of Vin is adjusted to the command voltage Vcmd representated by control signal Sc.For example, if current input voltage vin For 5V, and control circuit 130 judges the input voltage that the DC power supply generation device DCG of front end can be made to have peak power output When Vin is 3V, then control circuit 130 can provide a correspondence to the control signal Sc that command voltage Vcmd is 3V to inversion at this time Circuit 110 so that inverter circuit 110 reacts on control signal Sc and input voltage vin is gradually decreased to 3V from 5V.
In the present embodiment, control circuit 130 substantially can set command voltage Vcmd according to the controlling mechanism of MPPT, And corresponding control signal Sc is produced to control direct-current input power supplying DCin according to command voltage Vcmd, use the direct current for making front end The output power programmable single-chip system maximum power point of power supply generator DCG.But in input voltage vin and set command voltage When the gap of Vcmd is excessive, control circuit 130 is that can adjust the setting value of command voltage Vcmd, and using prevents actual input electricity Pressure Vin can not follow excessive command voltage Vcmd and cause system out of control.
Specifically, power characteristic/fan-out capability of the DC power supply generation device DCG of front end is not maintained at solid Fixed, it may cause the change of power characteristic because of the change of some external conditions at any time.For example, if front end it is straight The optical-electric module that galvanic electricity source generating device DCG is made of solar panels, then power characteristic/fan-out capability of solar panels is very big Degree can be influenced be subject to weather.Firmly then input current Iin can be caused to decline suddenly if solar panels are shielded, and power Characteristic can also change correspondingly.If control circuit 130 continues to produce with the setting value of the command voltage Vcmd of previous period at this time When control signal Sc controls inverter circuit 110, i.e., it can cause inverter circuit 110 can not continued operation.
To solve the above-mentioned problems, the control circuit 130 of the present embodiment can calculate the input voltage vin detected and order The voltage difference of voltage Vcmd is used as the basis for estimation of setting command voltage Vcmd.Wherein, control circuit 130 can judge to input Whether the voltage difference of voltage Vin and command voltage Vcmd is more than default value.When control circuit 130 judges calculated voltage When difference is less than or equal to default value, it is too big inclined to represent that the power characteristic of the DC power supply generation device DCG of front end does not have to occur Move, therefore control circuit 130 can adjust command voltage Vcmd based on MPPT computings, and set input voltage vin and go to follow life The magnitude of voltage of voltage Vcmd is made, uses and makes direct-current input power supplying DCin to have maximum power.Conversely, when control circuit 130 is sentenced When constant voltage difference is more than default value, represent that DC power supply generation device DCG may be because the change of external condition and cause work( The characteristic offset of rate, so when control circuit 130 can set the magnitude of voltage of command voltage Vcmd and be equal to current input electricity Press the magnitude of voltage of Vin.In other words, in the case where the voltage difference of input voltage vin and command voltage Vcmd exceed default value, The magnitude of voltage that control circuit 130 can set command voltage Vcmd goes to follow current input voltage vin, then with this command voltage MPPT computings are carried out based on Vcmd setting values, use prevent input voltage vin can not follow excessive command voltage Vcmd and Cause the system failure.
The specific system architecture of control circuit 130 is as shown in Figure 2.Fig. 2 is refer to, control circuit 130 includes MPPT computings Module 131 (that is, maximum power point tracking computing module), adder 132 and drive circuit 133.
In the present embodiment, MPPT computing modules 131 can sample input voltage vin and input current Iin, calculate input electricity The voltage difference of pressure Vin and command voltage Vcmd is tied with judging whether the voltage difference is more than default value according to judgement Fruit produces disturbing signal Sd.Wherein, when MPPT computing modules 131 judge that the voltage difference is less than or equal to default value, MPPT Computing module 131 can adjust disturbing signal Sd based on MPPT computings.And when MPPT computing modules 131 judge the voltage difference During more than or equal to default value, MPPT modules do not do MPPT computings, and the magnitude of voltage that control circuit 130 can set command voltage Vcmd is gone Current input voltage vin is followed, that is, the magnitude of voltage for setting the command voltage is equal to the magnitude of voltage of the current input voltage.
In MPPT computings, the MPPT computing modules 131 of control circuit 130 can be according to input voltage vin and input current Iin calculates input power, and carrys out modulation disturbance quantity Δ V by the input power compared before and after disturbing to produce corresponding disturbance Signal Sd.For example, if the input power of current point in time is more than the input power of previous time point, MPPT computing modules The 131 disturbing signal Sd provided are the disturbance quantity Δ V identical with the perturbation direction under previous time point (with positive disturbance quantity+Δ V tables Show), and if current point in time input power be less than or equal to previous time point input power, MPPT computing modules 131 The disturbing signal Sd of offer is the disturbance quantity Δ V opposite with the perturbation direction under previous time point (to bear disturbance quantity-Δ V tables Show).
Then, disturbing signal Sd and a reference signal Sc ' are overlapped using adder 132, it is corresponding uses generation Command voltage Vcmd is provided to drive circuit 133.In other words, command voltage Vcmd caused by adder 132 is disturbing signal Disturbance quantity Δ V representated by Sd is superimposed with the magnitude of voltage representated by reference signal Sc '.In the present embodiment, reference signal Sc ' Representative magnitude of voltage is the command voltage Vcmd ' of previous time point.Therefore, command voltage Vcmd caused by adder 132 Can actually be equal to being superimposed for disturbance quantity Δ V and the command voltage Vcmd ' of previous time point, that is, Vcmd=Vcmd '+Δ V or Vcmd=Vcmd '-Δ V.Thereby, the corresponding control signal Sc of command voltage Vcmd generations that drive circuit 133 can be based on setting To control the start of inverter circuit 110.Wherein, the drive circuit 133 of the present embodiment further includes a Pulse Width Modulation generation circuit, its The control signal Sc of generation is to control a pulse-width modulation signal (PWM signal) for the switching cycle of inverter circuit 110.
For example, arrange in pairs or groups Fig. 3 from the point of view of, it is assumed that the input voltage vin of current point in time for magnitude of voltage V1 ' and it is previous when Between the input voltage vin put be magnitude of voltage V1 ".Control circuit provides negative perturbation direction (that is, order electricity between the time point Pressure drop is low) disturbance quantity Δ V.At this time, when control circuit 130 can calculate current according to input voltage vin and input current Iin Between the input power P1 ' that puts be V1 ' × I1 ', and the input power P1 " of previous time point is V1 " × I1 ".Wherein, control electricity Road 130 can be more than the input power P1 " of previous time point according to the current input power P1 ' of the result judgement of power calculation, because This continues to provide the disturbance quantity Δ V identical with previous time point perturbation direction, even also V1 '=V1 "-Δ V so that input voltage Vin directions have the magnitude of voltage V1 convergences of maximal input P1.
On the other hand, if the input voltage vin of current point in time is electric for the input of magnitude of voltage V1 " ' and previous time point Pressure Vin is magnitude of voltage V1.Control circuit 130 provides the disturbance quantity Δ V of negative perturbation direction between the time point.In this feelings Under shape, since control circuit 130 can calculate the input power of current point in time according to input voltage vin and input current Iin P1 " ' (being equal to V1 " ' × I1 " ') is less than the input power P1 of previous time point, therefore control circuit 130 can be changed to provide and just disturb The disturbance quantity Δ V of dynamic direction (that is, making voltage increase), even also V1 " '=V1+ Δs V so that input voltage vin is towards with most The magnitude of voltage V1 convergences of big input power P1.
Illustrate the specific control flow of the inverter 100 of the embodiment of the present invention with reference to Fig. 3 and Fig. 4.Wherein, scheme 3 be the relation for illustrating input voltage vins of the DC power supply generation device DCG under different external conditions and input current Iin.Figure 4 are the relations for illustrating direct-current input power supplying DCin times and input voltage vin.
Please with reference to Fig. 3 and Fig. 4, in the present embodiment, phases of the DC power supply generation device DCG in time point t0 to t1 Interior power characteristic can utilize characteristic curve CV1 to represent.Interior during this period, control circuit 130, which can first be set, meets characteristic song Setting values of the magnitude of voltage V1 of the maximum power point of line CV1 as current command voltage Vcmd.
Specifically, in period t0 to t1, since the power characteristic of DC power supply generation device DCG not yet becomes Change, therefore control circuit 130 can judge the voltage difference (that is, | V1-Vin |) between command voltage Vcmd and input voltage vin Less than default value.Control circuit 130 can perform MPPT computings at this time, use the magnitude of voltage V1 based on setting and produce corresponding control Signal Sc controls the start of inverter circuit 110.Wherein, control circuit 130 can react on disturbing signal Sd and increase or decrease One disturbance quantity, to increase or decrease the magnitude of voltage size of input voltage vin so that by the magnitude of voltage of input voltage vin adjust to The magnitude of voltage V1 of command voltage Vcmd.
From the viewpoint of the time, as shown in the input voltage vin waveform in t0 to t1 during Fig. 4, input voltage vin Can level off to command voltage Vcmd magnitude of voltage V1 section in react on the change of disturbance quantity Δ V and near magnitude of voltage V1 Shake back and forth, use and be dynamically stable on magnitude of voltage V1.
Then, in a period of time point t1 to t2, the power characteristic of DC power supply generation device DCG reacts on outer strip The change of part and become characteristic curve CV2 from characteristic curve CV1.At this time, due to input voltage vin and the electricity of command voltage Vcmd Pressure difference has not exceeded default value Vth, and control circuit 130 can not also judge that external condition has occurred and that change, therefore control electricity Command voltage Vcmd in can be still set as magnitude of voltage V1 by road 130 in period t1 to t2.Therefore, it is interior during this period, due to input Voltage Vin is less than command voltage Vcmd, and inverter circuit 110 can stop switching.
In time point t2, input voltage vin and the voltage difference of command voltage Vcmd reach default value Vth, this time control Circuit 130 processed can judge that the change of external condition has resulted in the power spy of DC power supply generation device DCG according to voltage difference Linearity curve shifts.Command voltage Vcmd can be changed and be set as magnitude of voltage by control circuit 130 in time point t2 from magnitude of voltage V1 V2.Therefore, interior during this period, inverter circuit 110 can react on control signal Sc makes input voltage vin attached in magnitude of voltage V2 again Recently concussion is returned.
Thereafter, control circuit 130 is understood to adjust command voltage Vcmd and input similar to above-mentioned MPPT control modes Voltage Vin so that command voltage Vcmd can be stable at the maximum work of characteristic curve CV2 over time with input voltage vin Magnitude of voltage Vp corresponding to rate point.
Fig. 5 is the step flow chart of the control method of the inverter of one embodiment of the invention.The inversion dress of the present embodiment The control method put can be applied in the inverter 100 depicted in Fig. 1 embodiments, but the present invention is not limited only to this.In this reality In the control method for applying example, first, by inverter circuit (such as 110) reception direct-current input power supplying DCin (step S410), and by The input voltage vin and input current Iin (step S420) of circuit for detecting (such as 120) detecting direct-current input power supplying DCin.Then, Control signal Sc is provided come control input voltage Vin by control circuit (such as 130), is used the magnitude of voltage tune of input voltage vin The whole command voltage Vcmd (step S430) to representated by control signal Sc.Thereafter, control circuit can calculate the input detected The voltage difference (step S440) of voltage Vin and command voltage Vcmd, and judge that the voltage difference is according to voltage difference It is no to be more than default value (step S450).
If step S450 is judged as YES, the magnitude of voltage that control circuit can set command voltage Vcmd is equal to current input The magnitude of voltage (step S460) of voltage Vin.Conversely, if step S450 is judged as NO, control circuit can based on MPPT computings come Disturbing signal Sd (step S470) caused by adjustment so that the input power of direct-current input power supplying DCin can substantive Shangdi tieed up Hold near maximum power point.
Wherein, the control method described in Fig. 4 embodiments can obtain the support of abundance according to earlier figures 1 to the explanation of Fig. 3 With teaching, therefore similar or repetition repeated no more in this.
, can be by calculating input voltage and command voltage in conclusion the inverter and its control method of the present invention Voltage difference, and the voltage difference whether more than the mode of a default value come judge the power of direct-current input power supplying spy Whether property shifts.Wherein, when the power characteristic for judging direct-current input power supplying shifts, command voltage is set as working as Preceding input voltage, then maximum power point tracking computing is carried out based on the setting value of this command voltage, using prevents from inputting Voltage can not follow excessive command voltage and cause the system failure.
It is above disclosed to be merely a preferred embodiment of the present invention, the right of the present invention cannot be limited with this certainly Scope, therefore the equivalent variations made according to scope of the present invention patent, are still within the scope of the present invention.

Claims (10)

  1. A kind of 1. inverter, it is characterised in that including：
    One inverter circuit, receives a direct-current input power supplying, the direct-current input power supplying is converted to an exchange out-put supply；
    One circuit for detecting, to detect an input voltage of the direct-current input power supplying and an input current；And
    One control circuit, couples the inverter circuit and the circuit for detecting, described inverse to control to provide a control signal Become circuit, use and adjust the magnitude of voltage of the input voltage to the command voltage representated by the control signal,
    Wherein, the control circuit calculates a voltage difference of the input voltage and command voltage detected, and judges Whether the voltage difference is more than a default value,
    When the control circuit judges that the voltage difference is more than the default value, magnitude of voltage of the command voltage etc. is set In the magnitude of voltage of the current input voltage, then maximum power point tracking is carried out based on the magnitude of voltage of the command voltage Computing.
  2. 2. inverter according to claim 1, it is characterised in that the control circuit includes：
    One maximum power point tracking computing module, to sample the input voltage and the input current, calculates the voltage Difference produces a disturbing signal to judge whether the voltage difference is more than the default value according to judging result；
    One adder, couples the maximum power point tracking computing module, receive the disturbing signal and a reference signal and The command voltage is produced according to the disturbing signal and the reference signal, wherein the command voltage is the disturbing signal A representative disturbance quantity is superimposed with the magnitude of voltage of the command voltage of the previous time point representated by the reference signal；With And
    One drive circuit, receives the command voltage and produces the control signal according to the command voltage.
  3. 3. inverter according to claim 2, it is characterised in that when the maximum power point tracking computing module judges When the voltage difference is less than or equal to the default value, the maximum power point tracking computing module is chased after based on a maximum power point Track computing adjusts the disturbing signal.
  4. 4. inverter according to claim 3, it is characterised in that when carrying out the maximum power point tracking computing, The maximum power point tracking computing module calculates an input power according to the input voltage and the input current, when described When control circuit judges that the voltage difference is less than or equal to the default value, the maximum power point tracking computing module by than Compared with disturbance, front and rear input power carrys out disturbance quantity described in modulation, uses and produces corresponding disturbing signal, to make the input power Level off to a maximal input.
  5. 5. inverter according to claim 4, it is characterised in that if the input power of current point in time is more than previous Between the input power put, the maximum power point tracking computing module provides identical with the perturbation direction under previous time point Disturbance quantity, and if current point in time input power be less than or equal to previous time point input power, the maximum power point Follow the trail of computing module and the disturbance quantity opposite with the perturbation direction under previous time point is provided.
  6. 6. a kind of control method of inverter, the one of the direct-current input power supplying received suitable for following the trail of the inverter Maximal input, it is characterised in that the control method includes：
    Detect an input voltage and an input current for the direct-current input power supplying；
    A control signal is provided to control the input voltage, uses and adjusts the magnitude of voltage of the input voltage to the control A command voltage representated by signal；
    Calculate a voltage difference of the input voltage and command voltage detected；
    Judge whether the voltage difference is more than a default value；And
    When the voltage difference is more than the default value, the magnitude of voltage for setting the command voltage is equal to the current input The magnitude of voltage of voltage, then maximum power point tracking computing is carried out based on the magnitude of voltage of the command voltage.
  7. 7. the control method of inverter according to claim 6, it is characterised in that provide the control signal to control The input voltage, uses and adjusts the magnitude of voltage of the input voltage to the step of the command voltage representated by the control signal Suddenly include：
    The disturbing signal for representing a disturbance quantity is provided；
    The disturbing signal is superimposed to a reference signal, the order electricity is produced according to the disturbing signal and the reference signal Pressure, wherein before the command voltage is one representated by the disturbance quantity and the reference signal representated by the disturbing signal The superposition of the magnitude of voltage of the command voltage at one time point；And
    The control signal is produced according to the command voltage.
  8. 8. the control method of inverter according to claim 7, it is characterised in that further include：
    When the voltage difference is less than or equal to the default value, the disturbance is adjusted based on a maximum power point tracking computing Signal.
  9. 9. the control method of inverter according to claim 8, it is characterised in that based on the maximum power point tracking The step of computing is to adjust the disturbing signal includes：
    An input power is calculated according to the input voltage and the input current；
    Compare the front and rear input power of disturbance；And
    According to disturbance quantity described in a comparative result modulation, use and produce the corresponding disturbing signal, to make the input power Level off to a maximal input.
  10. 10. the control method of inverter according to claim 9, it is characterised in that according to the comparative result modulation The disturbance quantity, use make the input power level off to the maximal input the step of include：
    Judge whether the input power of current point in time is more than the input power of previous time point；
    If the input power of current point in time is more than the input power of previous time point, there is provided with the disturbance under previous time point The identical disturbance quantity in direction；And
    If the input power of current point in time is less than or equal to the input power of previous time point, there is provided with disturbing under previous time point The opposite disturbance quantity in dynamic direction.
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CN201520047286.9U Active CN204465376U (en) 2014-02-26 2015-01-23 Inverter and alternating current voltage sampling circuit thereof
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