CN103066875B - Three port single-phase single-grade converter and methods of operation thereof - Google Patents
Three port single-phase single-grade converter and methods of operation thereof Download PDFInfo
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- CN103066875B CN103066875B CN201310000816.XA CN201310000816A CN103066875B CN 103066875 B CN103066875 B CN 103066875B CN 201310000816 A CN201310000816 A CN 201310000816A CN 103066875 B CN103066875 B CN 103066875B
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Abstract
The invention provides a kind of three port single-phase single-grade converters, it comprises input port, modulation port, controller, phase changer and active power decoupling circuit port.This input port receives and transmits the input power of DC power supply; This modulation port, according to this input power, produces the string ripple electric current of full-wave rectification; This controller produces switch control signal, phase-veversal switch controls signal, the first pulse width modulation controls signal and the second pulse width modulation controls signal; This phase changer controls signal according to this switch control signal and this phase-veversal switch, and changing this string ripple electric current is alternating current, and exports this alternating current to load or civil power.This modulation port controls signal according to this first pulse width modulation, and this active power decoupling circuit port controls signal according to this second pulse width modulation, performs corresponding action.
Description
Technical field
The present invention relates to a kind of three port single-phase single-grade converter and methods of operation thereof.
Background technology
Generally speaking, the input port of converter must have the function of maximum power tracing (maximum power pointtracking, MPPT) to draw the maximum power (maximum power point, MPP) of solar panels.The input port of converter is by after solar panels energy absorption, and the modulation port of converter can export the string ripple electric current of full-wave rectification.Then, the string ripple electric current of the phase changer conversion full-wave rectification that low frequency switches becomes alternating current, and is sent to civil power.In the prior art, converter utilizes high capacitance electrochemical capacitor to be in harmonious proportion the DC input power of solar panels and the output AC power of phase changer.That is when the input power of solar panels is greater than the power output of phase changer, high capacitance electrochemical capacitor absorbs the difference of the input power of solar panels and the power output of phase changer; When the input power of solar panels is less than the power output of phase changer, high capacitance electrochemical capacitor disengages difference to civil power by phase changer.But high capacitance electrochemical capacitor has larger volume, the comparatively shortcoming such as short life and lower reliability.
Summary of the invention
The invention provides three port single-phase single-grade converter and the methods of operation thereof that a kind of control method is simple, power conversion number of times is few and conversion efficiency is high.
To achieve these goals, the invention provides a kind of three port single-phase single-grade converters, this converter comprises: input port, modulation port, controller, phase changer and active power decoupling circuit port.Described input port, in order to be coupled to DC power supply, and receives and transmits the input power of this DC power supply; Described modulation port, in order to this input port of magnetic coupling, and according to this input power, produces and exports the string ripple electric current of full-wave rectification; Described controller, in order to produce switch control signal, phase-veversal switch controls signal, the first pulse width modulation controls signal and the second pulse width modulation controls signal; Described phase changer, be coupled to this modulation port, in order to control signal according to this switch control signal and this phase-veversal switch, the string ripple electric current changing this full-wave rectification becomes alternating current, and export this alternating current to load or civil power, wherein the frequency of this switch control signal and this phase-veversal switch control signal is identical with the frequency of this civil power.
Wherein this modulation port controls signal according to this first pulse width modulation, export the string ripple electric current of this full-wave rectification to this phase changer, this active power decoupling circuit port controls signal according to this second pulse width modulation, store the difference of this input power and this power output, when this second pulse width modulation control signal deenergizes, this active power decoupling circuit port exports this difference to this phase changer by this modulation port, and this controller is according to this power output, control the activation time that this first pulse width modulation controls signal.
Preferably, in three described port single-phase single-grade converters, this DC power supply is solar panels.
Preferably, in three described port single-phase single-grade converters, this input port has the function of maximum power tracing.
Preferably, in three described port single-phase single-grade converters, this input port comprises: the first coil, magnetizing inductance and the first switch.Described first coil has first end and the second end, and this first coil first end is coupled to the first end of this DC power supply, and wherein the second end of this DC power supply is held with being coupled to; Described magnetizing inductance has first end and the second end, and this magnetizing inductance first end is coupled to the first end of this DC power supply, and this magnetizing inductance second end is coupled to the second end of this first coil; Described first switch has first end, the second end and the 3rd end, this the first switch first end is coupled to the second end of this first coil, this the first switch second end controls signal in order to receive, this the first switch the 3rd end is coupled to this ground end, and wherein this first switch opens and closes according to this control signal.
Preferably, in three described port single-phase single-grade converters, this modulation port comprises: the second coil, second switch, the first diode, the first inductance and the second electric capacity.Described second coil has first end and the second end, and this second coil second end is coupled to this ground end; Described second switch has first end, the second end and the 3rd end, and this second switch second end controls signal in order to receive this first pulse width modulation, and wherein this second switch controls signal open and close according to this first pulse width modulation; Described first diode has first end and the second end, and this first diode is coupled to this ground end, and this first diode second end is coupled to the 3rd end of this second switch; Described first inductance has first end and the second end, and this first inductance first end is coupled to the second end of this first diode; Described second electric capacity has first end and the second end, and this second electric capacity first end is coupled to the second end of this first inductance, and this second electric capacity second end is coupled to this ground end.
Preferably, in three described port single-phase single-grade converters, this active power decoupling circuit port comprises: tertiary coil, the second diode, the 3rd switch, the second inductance, the 3rd diode and the first electric capacity.Described tertiary coil has first end and the second end; Described second diode has first end and the second end, and this second diode first end is coupled to the second end of this tertiary coil; Described 3rd switch has first end, the second end and the 3rd end, 3rd switch first end is coupled to the second end of this second diode, 3rd switch second end controls signal in order to receive this second pulse width modulation, and wherein the 3rd switch controls signal open and close according to this second pulse width modulation; Described second inductance has first end and the second end, and this second inductance first end is coupled to the first end of this tertiary coil, and this second inductance second end is coupled to the 3rd end of the 3rd switch; Described 3rd diode has first end and the second end, and the 3rd diode first end is coupled to the first end of this tertiary coil; Described first electric capacity has first end and the second end, and this first electric capacity first end is coupled to the second end of this second inductance, and this first electric capacity second end is coupled to the second end of the 3rd diode.
Preferably, in three described port single-phase single-grade converters, this phase changer comprises: the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 3rd inductance.Described 4th switch has first end, the second end and the 3rd end, and the 4th switch first end is coupled to the first end of this second electric capacity, and the 4th switch second end is in order to receive this switch control signal; Described 5th switch has first end, the second end and the 3rd end, 5th switch first end is coupled to the first end of this second electric capacity, 5th switch second end controls signal in order to receive this phase-veversal switch, and the 5th switch the 3rd end is coupled to the second end of this civil power; Described 6th switch has first end, the second end and the 3rd end, and the 6th switch first end is coupled to the 3rd end of the 4th switch, and the 6th switch second end controls signal in order to receive this phase-veversal switch, and the 6th switch the 3rd end is coupled to this ground end; Described 7th switch has first end, the second end and the 3rd end, and the 7th switch first end is coupled to the 3rd end of the 5th switch, and the 7th switch second end is in order to receive this switch control signal, and the 7th switch the 3rd end is coupled to this ground end; Described 3rd inductance has first end and the second end, and the 3rd inductance first end is coupled to the 3rd end of the 4th switch, and the 3rd inductance second end is coupled to the first end of this civil power.
Preferably, in three described port single-phase single-grade converters, this converter separately comprises electric capacity of voltage regulation.Described electric capacity of voltage regulation has first end and the second end, this electric capacity of voltage regulation first end is coupled to the first end of this DC power supply, this electric capacity of voltage regulation second end is coupled to the second end of this DC power supply, wherein the direct voltage that provides in order to stablize this DC power supply of this electric capacity of voltage regulation.
Preferably, in three described port single-phase single-grade converters, the induction direction of this second coil is identical with the induction direction of this first coil, and the induction direction of this tertiary coil is contrary with the induction direction of this first coil.
Preferably, in three described port single-phase single-grade converters, this input power is the product equaling the direct current that this direct voltage and this DC power supply provide, wherein this direct current is relevant with this maximum power tracing, and this controller is according to this direct current, control the activation time that this second pulse width modulation controls signal.
Preferably, in three described port single-phase single-grade converters, this power output is the product of the voltage equaling this alternating current and this civil power.
Preferably, in three described port single-phase single-grade converters, when this first switch, this second switch and the 3rd switch open, the input power received from this input port is stored to this first inductance and this second inductance, and wherein this second inductance is the difference storing this input power and this power output.
Preferably, in three described port single-phase single-grade converters, when this second switch close and the 3rd switch open time, this power stored by the first inductance is output to this phase changer, and is stored to this second inductance from this input power that this input port receives.
Preferably, in three described port single-phase single-grade converters, when this second switch is opened and the 3rd switch is cut out, this power stored by the second inductance to this first electric capacity, and is stored to this first inductance from the input power that this input port receives by the 3rd diode storage.
Preferably, in three described port single-phase single-grade converters, when this first switch, this second switch and the 3rd switch are all closed, this power stored by the first inductance is output to this phase changer, this power stored by the second inductance by the 3rd diode storage to this first electric capacity, and the power stored by this magnetizing inductance by this first diode storage to this first electric capacity.
Preferably, in three described port single-phase single-grade converters, activation time of this control signal controls by this second pulse width modulation activation time that activation time of signal and this first pulse width modulation control signal to perform or logical operation determined.
Preferably, in three described port single-phase single-grade converters, when this control signal activation, this magnetizing inductance charges.
Present invention also offers a kind of method of operation of three port single-phase single-grade converters, this three ports single-phase single-grade converter comprises input port, modulation port, controller, phase changer and active power decoupling circuit port, and this method of operation comprises:
This input port receives and transmits the input power of DC power supply; And
This modulation port controls signal according to the first pulse width modulation, and this active power decoupling circuit port controls signal according to the second pulse width modulation, performs corresponding action.
Preferably, in the method for operation of three described port single-phase single-grade converters, this modulation port controls signal according to this first pulse width modulation, and this active power decoupling circuit port controls signal according to this second pulse width modulation, performs this corresponding action and comprises:
When this first pulse width modulation control signal and this second pulse width modulation control signal all activation time, the input power received from this input port is stored to this first inductance and this second inductance, and wherein this second inductance is the difference storing this input power and this power output.
Preferably, in the method for operation of three described port single-phase single-grade converters, this modulation port controls signal according to this first pulse width modulation, and this active power decoupling circuit port controls signal according to this second pulse width modulation, performs this corresponding action and comprises:
When this first pulse width modulation control signal deenergize and this second pulse width modulation controls signal activation time, this power stored by the first inductance is output to this phase changer, and is stored to this second inductance from this input power that this input port receives.
Preferably, in the method for operation of three described port single-phase single-grade converters, this modulation port controls signal according to this first pulse width modulation, and this active power decoupling circuit port controls signal according to this second pulse width modulation, performs this corresponding action and comprises:
When this first pulse width modulation controls signal activation and this second pulse width modulation control signal deenergizes, this power stored by the second inductance to this first electric capacity, and is stored to this first inductance from the input power that this input port receives by the 3rd diode storage.
Preferably, in the method for operation of three described port single-phase single-grade converters, this modulation port controls signal according to this first pulse width modulation, and this active power decoupling circuit port controls signal according to this second pulse width modulation, performs this corresponding action and comprises:
When this first pulse width modulation controls signal and this second pulse width modulation control signal all deenergizes, this power stored by the first inductance is output to this phase changer, this power stored by the second inductance by the 3rd diode storage to this first electric capacity, and the power stored by this magnetizing inductance by this first diode storage to this first electric capacity.
Preferably, in the method for operation of three described port single-phase single-grade converters, activation time of this control signal controls by this second pulse width modulation activation time that activation time of signal and this first pulse width modulation control signal to perform or logical operation determined.
Preferably, in the method for operation of three described port single-phase single-grade converters, when this control signal activation, this magnetizing inductance charges.
Preferably, in the method for operation of three described port single-phase single-grade converters, this DC power supply is solar panels.
Preferably, in the method for operation of three described port single-phase single-grade converters, this input port has the function of maximum power tracing.
This three ports single-phase single-grade converter and this method of operation utilize modulation port to control signal according to the first pulse width modulation, and active power decoupling circuit port controls signal according to the second pulse width modulation, performs corresponding action.Therefore, compared to prior art, the present invention has following advantages:
One, magnetizing inductance energy storage effectively can be sent to load or civil power to this active power decoupling circuit port by the present invention, loses to reduce and improves the conversion efficiency of this three ports single-phase single-grade converter;
Two, control method of the present invention is Average Current Control Method and this three ports single-phase single-grade converter is operable in continuous current mode (Continuous Current Mode, CCM), so operator scheme quantity of the present invention is few, control method simple, power conversion number of times is few and conversion efficiency is high;
Three, due to second coils connected in series at the electric capacity in this active power decoupling circuit port and this modulation port, so the number of turns ratio of the first coil of this three ports single-phase single-grade converter and this second coil and this first coil higher than not with the number of turns of this tertiary coil, thus the operating voltage range of DC power supply is larger;
Four, three port single-phase single-grade converters provided by the present invention do not need high capacitance electrochemical capacitor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of three port single-phase single-grade converters of one embodiment of the invention;
Fig. 2 be one embodiment of the invention control signal, the first pulse width modulation controls signal, the second pulse width modulation controls signal, control signal, flow through the electric current of the first inductance and flow through the relation schematic diagram of electric current of the second inductance;
Fig. 3 is the schematic diagram of three port single-phase single-grade converters at pattern I of one embodiment of the invention;
Fig. 4 is the schematic diagram of three port single-phase single-grade converters at pattern II of one embodiment of the invention;
Fig. 5 is the schematic diagram of three port single-phase single-grade converters at pattern III of one embodiment of the invention;
Fig. 6 is the schematic diagram of three port single-phase single-grade converters at pattern IV of one embodiment of the invention;
Fig. 7 is the flow chart of the three port single-phase single-grade converters of another embodiment of the present invention.
[main element symbol description]
100 3 port single-phase single-grade converters
102 input ports
104 modulation ports
106 controllers
108 phase changers
110 active power decoupling circuit (Active Power Decoupling Circuit, APDC)
112 DC power supply
114 filter capacitors
1022 first coils
1024 magnetizing inductances
1026 first switches
1042 second coils
1044 second switches
1046 first diodes
1048 first inductance
1082 second electric capacity
1084 the 4th switches
1086 the 5th switches
1088 the 6th switches
1090 the 7th switches
1092 the 3rd inductance
1102 tertiary coils
1104 second diodes
1106 the 3rd switches
1108 second inductance
1110 the 3rd diodes
1112 first electric capacity
AC civil power
CS controls signal
FPWM first pulse width modulation controls signal
GND ground end
IDC direct current
IAC alternating current
IR, IL electric current
SCS switch control signal
phase-veversal switch controls signal
SPWM second pulse width modulation controls signal
VDC direct voltage
VAC alternating voltage
The cross-pressure of VX first electric capacity
700-716 step
Embodiment
For making there is further understanding to object of the present invention, structure, feature and function thereof, embodiment is hereby coordinated to be described in detail as follows.
Please refer to shown in Fig. 1, Fig. 1 is the schematic diagram of the three port single-phase single-grade converters 100 of one embodiment of the invention.Three port single-phase single-grade converters 100 comprise input port 102, modulation port 104, controller 106, phase changer 108 and active power decoupling circuit port 110.Input port 102 is coupled to DC power supply 112, input port 102 also receives and transmits the input power PDC of DC power supply 112, wherein DC power supply 112 can be solar panels, and input port 102 has the function of maximum power tracing (maximum power point tracking).But it is can be solar panels that the present invention is not limited to DC power supply 112.Modulation port 104 magnetic coupling input port 102.Controller 106 produces switch control signal SCS, phase-veversal switch controls signal
first pulse width modulation controls signal FPWM and the second pulse width modulation controls signal SPWM.Phase changer 108 is coupled to modulation port 104, and phase changer 108 is in order to control signal according to switch control signal SCS and phase-veversal switch
the string ripple electric current of conversion full-wave rectification becomes alternating current IAC, and output AC electric current I AC is to civil power AC, and wherein switch control signal SCS and phase-veversal switch control signal
frequency identical with the frequency of civil power AC.But the present invention is not limited to output AC electric current I AC to civil power AC, also can output AC electric current I AC extremely general AC load.As shown in Figure 1, modulation port 104, separately in order to control signal FPWM and input power PDC according to the first pulse width modulation, exports the string ripple electric current of full-wave rectification to phase changer 108.In addition, active power decoupling circuit port 110 controls signal SPWM according to the second pulse width modulation, the difference of the power output PAC that storage input power PDC and phase changer 108 export, and when the second pulse width modulation control signal SPWM deenergize time, active power decoupling circuit port 110 exports the difference of the power output PAC that input power PDC and phase changer 108 export to phase changer 108 by modulation port 104.In addition, the power output PAC that controller 106 exports according to phase changer 108, controls the activation time that the first pulse width modulation controls signal FPWM.
As shown in Figure 1, input port 102 comprises the first coil 1022, magnetizing inductance 1024 and the first switch 1026.First coil 1022 has first end and the second end, and the first coil 1022 first end is coupled to the first end of DC power supply 112.Wherein the second end of DC power supply 112 holds GND with being coupled to; Magnetizing inductance 1024 has first end and the second end, and magnetizing inductance 1024 first end is coupled to the first end of DC power supply 112, and magnetizing inductance 1,024 second end is coupled to the second end of the first coil 1022; First switch 1026 has first end, the second end and the 3rd end, first switch 1026 first end is coupled to the second end of the first coil 1022, first switch 1,026 second end controls signal CS in order to receive, first switch 1026 the 3rd end holds GND with being coupled to, and wherein the first switch 1026 opens (ON) according to control signal CS and cuts out (OFF).
As shown in Figure 1, modulation port 104 comprises the second coil 1042, second switch 1044, first diode 1046, first inductance 1048 and the second electric capacity 1082.Second coil 1042 has first end and the second end, and the second coil 1,042 second end holds GND with being coupled to; Second switch 1044 has first end, the second end and the 3rd end, second switch 1,044 second end controls signal FPWM in order to receive the first pulse width modulation, and wherein second switch 1044 controls signal FPWM according to the first pulse width modulation and opens (ON) and closedown (OFF); First diode 1046 has first end and the second end, and the first diode 1046 first end holds GND with being coupled to, and the first diode 1,046 second end is coupled to the 3rd end of second switch 1044; First inductance 1048 has first end and the second end, and the first inductance 1048 first end is coupled to the second end of the first diode 1046; Second electric capacity 1082 has first end and the second end, and the second electric capacity 1082 first end is coupled to the second end of the first inductance 1048, and the second electric capacity 1,082 second end holds GND with being coupled to.
As shown in Figure 1, active power decoupling circuit port 110 comprises tertiary coil 1102, second diode 1104, the 3rd switch 1106, second inductance 1108, the 3rd diode 1110 and the first electric capacity 1112.Tertiary coil 1102 has first end and the second end; Second diode 1104 has first end and the second end, and the second diode 1104 first end is coupled to the second end of tertiary coil 1102; 3rd switch 1106 has first end, the second end and the 3rd end, 3rd switch 1106 first end is coupled to the second end of the second diode 1104,3rd switch 1,106 second end controls signal SPWM in order to receive the second pulse width modulation, and wherein the 3rd switch 1106 controls signal SPWM according to the second pulse width modulation and opens (ON) and cut out (OFF); Second inductance 1108 has first end and the second end, and the second inductance 1108 first end is coupled to the first end of tertiary coil 1102, and the second inductance 1,108 second end is coupled to the 3rd end of the 3rd switch 1106; 3rd diode 1110 has first end and the second end, and the 3rd diode 1110 first end is coupled to the first end of tertiary coil 1102; First electric capacity 1112 has first end and the second end, and the first electric capacity 1112 first end is coupled to the second end of the second inductance 1108, and the first electric capacity 1,112 second end is coupled to the second end of the 3rd diode 1110.
As shown in Figure 1, phase changer 108 comprises the 4th switch 1084, the 5th switch 1086, the 6th switch 1088, the 7th switch 1090 and the 3rd inductance 1092.4th switch 1084 has first end, the second end and the 3rd end, and the 4th switch 1084 first end is coupled to the first end of the second electric capacity 1082, and the 4th switch 1,084 second end controls signal SCS in order to receiving key; 5th switch 1086 has first end, the second end and the 3rd end, and the 5th switch 1086 first end is coupled to the first end of the second electric capacity 1082, and the 5th switch 1,086 second end controls signal in order to receive phase-veversal switch
5th switch 1086 the 3rd end is coupled to second end of civil power AC; 6th switch 1088 has first end, the second end and the 3rd end, and the 6th switch 1088 first end is coupled to the 3rd end of the 4th switch 1084, and the 6th switch 1,088 second end controls signal in order to receive phase-veversal switch
6th switch 1088 the 3rd end holds GND with being coupled to; 7th switch 1090 has first end, the second end and the 3rd end, and the 7th switch 1090 first end is coupled to the 3rd end of the 5th switch 1086, and the 7th switch 1,090 second end controls signal SCS in order to receiving key, and the 7th switch 1090 the 3rd end holds GND with being coupled to; 3rd inductance 1092 has first end and the second end, 3rd inductance 1092 first end is coupled to the 3rd end of the 4th switch 1084,3rd inductance 1,092 second end is coupled to the first end of civil power AC, and wherein the 3rd inductance 1092 can the radio-frequency component of electric current I R on filtering first inductance 1048.
In addition, as shown in Figure 1, three port single-phase single-grade converters 100 separately comprise filter capacitor 114.Filter capacitor 114 has first end and the second end, filter capacitor 114 first end is coupled to the first end of DC power supply 112, filter capacitor 114 second end is coupled to the second end of DC power supply 112, and wherein filter capacitor 114 flows through the high-frequency current on switch 1026 in order to filtering.
As shown in Figure 1, the induction direction of the second coil 1042 is identical with the induction direction of the first coil 1022, and the induction direction of tertiary coil 1102 is contrary with the induction direction of the first coil 1022.In addition, the input power PDC of DC power supply 112 equals the product of the direct current IDC that direct voltage VDC and DC power supply 112 provide, and the power output PAC of phase changer 108 output equals the product of the alternating voltage VAC of alternating current IAC and civil power AC, wherein direct current IDC is relevant with the function of the maximum power tracing of input port 102, and controller 106 is according to direct current IDC, control the activation time that the second pulse width modulation controls signal SPWM.
As shown in Figure 1, controller 106 exports the electric current I R of the second electric capacity 1082, the cross-pressure VX of the first electric capacity 1112 and alternating voltage VAC to according to direct voltage VDC, direct current IDC, modulation port 104, produces switch control signal SCS, phase-veversal switch controls signal
first pulse width modulation controls signal FPWM and the second pulse width modulation controls signal SPWM.In addition, controller 106 separately performs or (OR) logical operation in order to control signal SPWM to the first pulse width modulation control signal FPWM and the second pulse width modulation, to determine the activation time controlling signal CS.Therefore, control in a switching cycle of signal at above-mentioned pulse width modulation, controller 106 controls signal by switch control signal SCS, phase-veversal switch
first pulse width modulation controls signal FPWM, control signal CS and the second pulse width modulation control signal SPWM controls the first electric capacity 1112 that the difference of input power PDC and power output PAC is stored to active power decoupling circuit port 110 by three port single-phase single-grade converters 100.And provide input power PDC and the first electric capacity 1112 to provide difference to the first inductance 1048 of input power PDC and power output PAC by DC power supply 112 again.
Please refer to Fig. 2 to Fig. 6.Fig. 2 is that one embodiment of the invention controls signal CS, first pulse width modulation controls signal FPWM, second pulse width modulation controls signal SPWM, the relation schematic diagram of the electric current I R flowing through the first inductance 1048 and electric current I L flowing through the second inductance 1108, Fig. 3 is the schematic diagram of one embodiment of the invention three port single-phase single-grade converter 100 at pattern I, Fig. 4 is the schematic diagram of one embodiment of the invention three port single-phase single-grade converter 100 at pattern II, Fig. 5 is one embodiment of the invention three port single-phase single-grade converter 100 at the schematic diagram of pattern III and Fig. 6 is the schematic diagram of one embodiment of the invention three port single-phase single-grade converter 100 at pattern IV.
As shown in Figures 2 and 3, in pattern I, because controller 106 activation first pulse width modulation controls signal FPWM, the second pulse width modulation controls signal SPWM and control signal CS, so the first switch 1026, second switch 1044 and the 3rd switch 1106 are opened.Therefore, the input power PDC that input port 102 receives is stored to the first inductance 1048 and the second inductance 1108, and magnetizing inductance 1024 charges.Wherein the second inductance 1108 stores the difference of input power PDC and power output PAC, and flows through the electric current I R of the first inductance 1048 and flow through the electric current I L increase of the second inductance 1108.In addition, in pattern I, controller 106 can according to alternating voltage VAC and electric current I R, determine unlatching (ON) time (that is the first pulse width modulation controls the activation time of signal FPWM) of second switch 1044, and controller 106 according to the maximum of input power PDC, can control unlatching (ON) time of the 3rd switch 1106.
As shown in Figure 2 and Figure 4, in pattern II, because controller 106 activation second pulse width modulation controls signal SPWM and controls signal CS, and first pulse width modulation that deenergizes controls signal FPWM, so the first switch 1026 and the 3rd switch 1106 are opened (ON), and second switch 1044 is closed (OFF).Therefore, when second switch 1044 closes (OFF) and the 3rd switch 1106 opens (ON), power stored by first inductance 1048 is output to phase changer 108, the input power PDC received from input port 102 is stored to the second inductance 1108, magnetizing inductance 1024 charges, electric current I R reduces, and electric current I L increases.That is when above-mentioned pulse width modulation controls the switching cycle of signal when the zero-crossing point of alternating voltage VAC, power needed for civil power AC is lower, so the activation time that the first pulse width modulation controls signal FPWM is less than the activation time that the second pulse width modulation controls signal SPWM, cause the power stored by the first inductance 1048 to be output to phase changer 108, and be stored to the second inductance 1108 from the input power PDC that input port 102 receives.
As shown in Figure 2 and Figure 5, in pattern III, because controller 106 activation first pulse width modulation controls signal FPWM and controls signal CS, and second pulse width modulation that deenergizes controls signal SPWM, so the first switch 1026 and second switch 1044 are opened (ON), and the 3rd switch 1106 cuts out (OFF).Therefore, when second switch 1044 is opened and the 3rd switch 1106 is cut out, magnetizing inductance 1024 charges, input power PDC stored by second inductance 1108 and the difference of power output PAC are stored to the first electric capacity 1112 by the 3rd diode 1110, and be passed to phase changer 108 by the first electric capacity 1112, the input power PDC received from input port 102 is stored to the first inductance 1048, electric current I R increase, and electric current I L reduces.That is when above-mentioned pulse width modulation controls the switching cycle of signal when the peak value of alternating voltage VAC, power needed for civil power AC is higher, so the activation time that the first pulse width modulation controls signal FPWM is greater than the activation time that the second pulse width modulation controls signal SPWM, cause the difference of the input power PDC stored by the second inductance 1108 and power output PAC to be output to phase changer 108, and be stored to the first inductance 1048 from the input power PDC that input port 102 receives.
As shown in Figure 2 and Figure 6, in pattern IV, because controller 106 deenergizes, the first pulse width modulation controls signal FPWM, the second pulse width modulation controls signal SPWM and control signal CS, so the first switch 1026, second switch 1044 and the 3rd switch 1106 are closed (OFF).Therefore, when the first switch 1026, second switch 1044 and the 3rd switch 1106 all close (OFF), power stored by first inductance 1048 is output to phase changer 108, power stored by second inductance 1108 is stored to the first electric capacity 1112 by the 3rd diode 1110, and the power stored by magnetizing inductance 1024 is stored to the first electric capacity 1112 by the first diode 1046.Because second switch 1044 and the 3rd switch 1106 are closed, so electric current I R and electric current I L all reduces.
Therefore, as shown in Figure 2, when above-mentioned pulse width modulation controls the switching cycle of signal when the zero-crossing point of alternating voltage VAC, the operating sequence that three port single-phase single-grade converters 100 control in a switching cycle of signal at above-mentioned pulse width modulation is pattern I → pattern II → pattern IV; And when above-mentioned pulse width modulation controls the switching cycle of signal when the peak value of alternating voltage VAC, the operating sequence that three port single-phase single-grade converters 100 control in a switching cycle of signal at above-mentioned pulse width modulation is pattern I → pattern III → pattern IV.
Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, Fig. 7 is the flow chart of another embodiment of the present invention three port single-phase single-grade converter.The three port single-phase single-grade converters 100 of methods combining Fig. 1 of Fig. 7 illustrate, detailed step is as follows:
Step 700: start;
Step 702: input port 102 receives and transmit the input power PDC of DC power supply 112;
Step 704: when pulse width modulation controls the switching cycle of signal when the zero-crossing point of alternating voltage VAC, carry out step 706; When pulse width modulation controls the switching cycle of signal when the peak value of alternating voltage VAC, carry out step 712;
Step 706: the input power PDC received from input port 102 is stored to the first inductance 1048 and the second inductance 1108;
Step 708: the power stored by the first inductance 1048 is output to phase changer 108, and be stored to the second inductance 1108 from the input power PDC that input port 102 receives;
Step 710: the power stored by the first inductance 1048 is output to phase changer 108, power stored by second inductance 1108 is stored to the first electric capacity 1112 by the 3rd diode 1110, and the power stored by magnetizing inductance 1024 is stored to the first electric capacity 1112 by the first diode 1046, rebound step 704;
Step 712: the input power PDC received from input port 102 is stored to the first inductance 1048 and the second inductance 1108;
Step 714: the power stored by the second inductance 1108 is stored to the first electric capacity 1112 by the 3rd diode 1110, and be stored to the first inductance 1048 from the input power PDC that input port 102 receives;
Step 716: the power stored by the first inductance 1048 is output to phase changer 108, power stored by second inductance 1108 is stored to the first electric capacity 1112 by the 3rd diode 1110, and the power stored by magnetizing inductance 1024 is stored to the first electric capacity 1112 by the first diode 1046, rebound step 704.
As shown in Figure 2, when above-mentioned pulse width modulation controls the switching cycle of signal when the zero-crossing point of alternating voltage VAC, the operating sequence that three port single-phase single-grade converters 100 control in a switching cycle of signal at above-mentioned pulse width modulation is pattern I → pattern II → pattern IV.
As shown in Figures 2 and 3, in step 706 (pattern I), because controller 106 activation first pulse width modulation controls signal FPWM, the second pulse width modulation controls signal SPWM and control signal CS, so the first switch 1026, second switch 1044 and the 3rd switch 1106 are opened.Therefore, the input power PDC that input port 102 receives is stored to the first inductance 1048 and the second inductance 1108, and magnetizing inductance 1024 charges, wherein the second inductance 1108 is the differences storing input power PDC and power output PAC, and electric current I R increases with the electric current I L flowing through the second inductance 1108.In addition, in pattern I, controller 106 can according to alternating voltage VAC and electric current I R, determine the opening time (that is the first pulse width modulation controls the activation time of signal FPWM) of second switch 1044, and controller 106 according to the maximum of input power PDC, can control the opening time of the 3rd switch 1106.
As shown in Figure 2 and Figure 4, in step 708 (pattern II), because controller 106 activation second pulse width modulation controls signal SPWM and controls signal CS, and first pulse width modulation that deenergizes controls signal FPWM, so the first switch 1026 and the 3rd switch 1106 are opened, and second switch 1044 is closed.Therefore, when second switch 1044 is closed and the 3rd switch 1106 opens, the power stored by the first inductance 1048 is output to phase changer 108, the input power PDC received from input port 102 is stored to the second inductance 1108, magnetizing inductance 1024 charges, and electric current I R reduces, and electric current I L increases.That is when above-mentioned pulse width modulation controls the switching cycle of signal when the zero-crossing point of alternating voltage VAC, power needed for civil power AC is lower, so the activation time that the first pulse width modulation controls signal FPWM is less than the activation time that the second pulse width modulation controls signal SPWM, cause the power stored by the first inductance 1048 to be output to phase changer 108, and be stored to the second inductance 1108 from the input power PDC that input port 102 receives.
As shown in Figure 2 and Figure 6, in step 710 (pattern IV), because controller 106 deenergizes, the first pulse width modulation controls signal FPWM, the second pulse width modulation controls signal SPWM and control signal CS, so the first switch 1026, second switch 1044 and the 3rd switch 1106 are closed.Therefore, when the first switch 1026, second switch 1044 and the 3rd switch 1106 are all closed, power stored by first inductance 1048 is output to phase changer 108, power stored by second inductance 1108 is stored to the first electric capacity 1112 by the 3rd diode 1110, and the power stored by magnetizing inductance 1024 is stored to the first electric capacity 1112 by the first diode 1046.Because second switch 1044 and the 3rd switch 1106 are closed, so electric current I R and electric current I L all reduces.
In addition, when above-mentioned pulse width modulation controls the switching cycle of signal when the peak value of alternating voltage VAC, the operating sequence that three port single-phase single-grade converters 100 control in a switching cycle of signal at above-mentioned pulse width modulation is pattern I → pattern III → pattern IV, and wherein pattern I and pattern IV repeats no more.
As shown in Figure 2 and Figure 5, in step 714 (pattern III), because controller 106 activation first pulse width modulation controls signal FPWM and controls signal CS, and second pulse width modulation that deenergizes controls signal SPWM, so the first switch 1026 and second switch 1044 are opened, and the 3rd switch 1106 cuts out.Therefore, when second switch 1044 is opened and the 3rd switch 1106 is cut out, magnetizing inductance 1024 charges, input power PDC stored by second inductance 1108 and the difference of power output PAC are stored to the first electric capacity 1112 by the 3rd diode 1110, and be passed to phase changer 108 by the first electric capacity 1112, the input power PDC received from input port 102 is stored to the first inductance 1048, electric current I R increase, and electric current I L reduces.That is when above-mentioned pulse width modulation controls the switching cycle of signal when the peak value of alternating voltage VAC, power needed for civil power AC is higher, so the activation time that the first pulse width modulation controls signal FPWM is greater than the activation time that the second pulse width modulation controls signal SPWM, cause the difference of the input power PDC stored by the second inductance 1108 and power output PAC to be output to phase changer 108, and be stored to the first inductance 1048 from the input power PDC that input port 102 receives.
In sum, three port single-phase single-grade converters provided by the present invention and method of operation thereof utilize modulation port to control signal according to the first pulse width modulation, control signal with active power decoupling circuit port according to the second pulse width modulation, perform corresponding action.Therefore, compared to prior art, the present invention has following advantages: the first, magnetizing inductance energy storage effectively can be sent to civil power to active power decoupling circuit port by the present invention, loses to reduce and improves the conversion efficiency of three port single-phase single-grade converters; The second, control method of the present invention is Average Current Control Method and three port single-phase single-grade converters operate in continuous current mode (Continuous Current Mode, CCM), so operator scheme quantity of the present invention is few, control method simple, power conversion number of times is few and conversion efficiency is high; Three, due to second coils connected in series at the electric capacity in active power decoupling circuit and modulation port, so the first coil of three port single-phase single-grade converters can reduce with the number of turns ratio of tertiary coil with the number of turns ratio of the second coil and the first coil, thus the operating voltage range of DC power supply is larger; Four, this three ports single-phase single-grade converter does not need high capacitance electrochemical capacitor.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only enforcement example of the present invention.Must it is noted that the embodiment disclosed limit the scope of the invention.On the contrary, change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (13)
1. three port single-phase single-grade converters, it is characterized in that, this converter comprises:
Input port, in order to be coupled to DC power supply, and receives and transmits the input power of this DC power supply;
Modulation port, in order to this input port of magnetic coupling, and according to this input power, produces and exports the string ripple electric current of full-wave rectification;
Controller, in order to produce switch control signal, phase-veversal switch controls signal, the first pulse width modulation controls signal and the second pulse width modulation controls signal;
Phase changer, be coupled to this modulation port, in order to control signal according to this switch control signal and this phase-veversal switch, the string ripple electric current changing this full-wave rectification becomes alternating current, and export this alternating current to load or civil power, wherein the frequency of this switch control signal and this phase-veversal switch control signal is identical with the frequency of this civil power; And active power decoupling circuit port;
Wherein this modulation port controls signal according to this first pulse width modulation, export the string ripple electric current of this full-wave rectification to this phase changer, this active power decoupling circuit port controls signal according to this second pulse width modulation, store the difference of the power output that this input power and this phase changer export, when this second pulse width modulation control signal deenergizes, this active power decoupling circuit port exports this difference to this phase changer by this modulation port, and this controller is according to this power output, control the activation time that this first pulse width modulation controls signal; This active power decoupling circuit port comprises:
Tertiary coil, has first end and the second end;
Second diode, has first end and the second end, and this second diode first end is coupled to the second end of this tertiary coil;
3rd switch, there is first end, the second end and the 3rd end, 3rd switch first end is coupled to the second end of this second diode, 3rd switch second end controls signal in order to receive this second pulse width modulation, and wherein the 3rd switch controls signal open and close according to this second pulse width modulation;
Second inductance, has first end and the second end, and this second inductance first end is coupled to the first end of this tertiary coil, and this second inductance second end is coupled to the 3rd end of the 3rd switch;
3rd diode, has first end and the second end, and the 3rd diode first end is coupled to the first end of this tertiary coil; And
First electric capacity, has first end and the second end, and this first electric capacity first end is coupled to the second end of this second inductance, and this first electric capacity second end is coupled to the second end of the 3rd diode;
Wherein, this modulation port comprises:
Second coil, has first end and the second end, and this second coil second end is held with being coupled to, and this second coil tandem at this first electric capacity and this modulation port;
Second switch, has first end, the second end and the 3rd end, and this second switch second end controls signal in order to receive this first pulse width modulation, and wherein this second switch controls signal open and close according to this first pulse width modulation;
First diode, has first end and the second end, and the first end of this first diode is coupled to this ground end, and this first diode second end is coupled to the 3rd end of this second switch;
First inductance, has first end and the second end, and this first inductance first end is coupled to the second end of this first diode; And
Second electric capacity, has first end and the second end, and this second electric capacity first end is coupled to the second end of this first inductance, and this second electric capacity second end is coupled to this ground end.
2. three port single-phase single-grade converters as claimed in claim 1, it is characterized in that, this DC power supply is solar panels.
3. three port single-phase single-grade converters as claimed in claim 2, it is characterized in that, this input port has the function of maximum power tracing.
4. three port single-phase single-grade converters as claimed in claim 3, it is characterized in that, this input port comprises: the first coil, has first end and the second end, this the first coil first end is coupled to the first end of this DC power supply, and wherein the second end of this DC power supply is held with being coupled to;
Magnetizing inductance, have first end and the second end, this magnetizing inductance first end is coupled to the first end of this DC power supply, and this magnetizing inductance second end is coupled to the second end of this first coil; And
First switch, there is first end, the second end and the 3rd end, this the first switch first end is coupled to the second end of this first coil, this the first switch second end is in order to receive the first control signal, this the first switch the 3rd end is coupled to this ground end, and wherein this first switch opens and closes according to this first control signal.
5. three port single-phase single-grade converters as claimed in claim 4, it is characterized in that, this phase changer comprises: the 4th switch, there is first end, the second end and the 3rd end, 4th switch first end is coupled to the first end of this second electric capacity, and the 4th switch second end is in order to receive this switch control signal;
5th switch, have first end, the second end and the 3rd end, the 5th switch first end is coupled to the first end of this second electric capacity, and the 5th switch second end controls signal in order to receive this phase-veversal switch, and the 5th switch the 3rd end is coupled to the second end of this civil power;
6th switch, has first end, the second end and the 3rd end, and the 6th switch first end is coupled to the 3rd end of the 4th switch, and the 6th switch second end controls signal in order to receive this phase-veversal switch, and the 6th switch the 3rd end is coupled to this ground end;
7th switch, has first end, the second end and the 3rd end, and the 7th switch first end is coupled to the 3rd end of the 5th switch, and the 7th switch second end is in order to receive this switch control signal, and the 7th switch the 3rd end is coupled to this ground end; And
3rd inductance, has first end and the second end, and the 3rd inductance first end is coupled to the 3rd end of the 4th switch, and the 3rd inductance second end is coupled to the first end of this civil power.
6. three port single-phase single-grade converters as claimed in claim 5, it is characterized in that, this converter separately comprises: electric capacity of voltage regulation, there is first end and the second end, this electric capacity of voltage regulation first end is coupled to the first end of this DC power supply, this electric capacity of voltage regulation second end is coupled to the second end of this DC power supply, wherein the direct voltage that provides in order to stablize this DC power supply of this electric capacity of voltage regulation.
7. three port single-phase single-grade converters as claimed in claim 6, is characterized in that, the induction direction of this second coil is identical with the induction direction of this first coil, and the induction direction of this tertiary coil is contrary with the induction direction of this first coil.
8. three port single-phase single-grade converters as claimed in claim 6, it is characterized in that, this input power is the product equaling the direct current that this direct voltage and this DC power supply provide, wherein this direct current is relevant with this maximum power tracing, and this controller is according to this direct current, control the activation time that this second pulse width modulation controls signal.
9. three port single-phase single-grade converters as claimed in claim 6, it is characterized in that, this power output is the product of the voltage equaling this alternating current and this civil power.
10. three port single-phase single-grade converters as claimed in claim 6, it is characterized in that, when this first switch, this second switch and the 3rd switch open, the input power received from this input port is stored to this first inductance and this second inductance, and wherein this second inductance is the difference storing this input power and this power output;
Maybe when this second switch is closed and the 3rd switch open time, this power stored by the first inductance is output to this phase changer, and is stored to this second inductance from this input power that this input port receives;
Maybe when this second switch is opened and the 3rd switch is cut out, this power stored by the second inductance to this first electric capacity, and is stored to this first inductance from the input power that this input port receives by the 3rd diode storage;
Maybe when this first switch, this second switch and the 3rd switch are all closed, this power stored by the first inductance is output to this phase changer, this power stored by the second inductance by the 3rd diode storage to this first electric capacity, and the power stored by this magnetizing inductance by this first diode storage to this first electric capacity.
11. three port single-phase single-grade converters as claimed in claim 10, it is characterized in that, this first activation time controlling signal is that the activation time of the activation time and this first pulse width modulation control signal controlling signal by this second pulse width modulation performs or logical operation determined.
12. three port single-phase single-grade converters as claimed in claim 11, is characterized in that, when this first control signal activation, this magnetizing inductance charges.
The method of operation of 13. a kind of three port single-phase single-grade converter, is applied to as the converter in claim 1-12 item as described in any one, it is characterized in that, this method of operation comprises:
This input port receives and transmits the input power of DC power supply; And
This modulation port controls signal according to the first pulse width modulation, and this active power decoupling circuit port controls signal according to the second pulse width modulation, performs corresponding action.
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| TW101149749A TWI478477B (en) | 2012-12-25 | 2012-12-25 | Three-port single-phase single-stage micro-inverter and operation method thereof |
| CN201310000816.XA CN103066875B (en) | 2012-12-25 | 2013-01-04 | Three port single-phase single-grade converter and methods of operation thereof |
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| TW101149749A TWI478477B (en) | 2012-12-25 | 2012-12-25 | Three-port single-phase single-stage micro-inverter and operation method thereof |
| CN201310000816.XA CN103066875B (en) | 2012-12-25 | 2013-01-04 | Three port single-phase single-grade converter and methods of operation thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102088192A (en) * | 2011-03-02 | 2011-06-08 | 中南大学 | Single-phase single-stage current type photovoltaic grid inverter and control method thereof |
| CN102237691A (en) * | 2011-07-06 | 2011-11-09 | 东北大学 | Wind energy and solar energy grid-connected generation system and control method thereof |
| CN102820803A (en) * | 2012-06-04 | 2012-12-12 | 苏州达方电子有限公司 | Three-port single-phase single-pole micro current converter and operating method thereof |
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| WO2010090032A1 (en) * | 2009-02-06 | 2010-08-12 | 新電元工業株式会社 | Current detecting circuit and transformer current measuring system |
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| CN102088192A (en) * | 2011-03-02 | 2011-06-08 | 中南大学 | Single-phase single-stage current type photovoltaic grid inverter and control method thereof |
| CN102237691A (en) * | 2011-07-06 | 2011-11-09 | 东北大学 | Wind energy and solar energy grid-connected generation system and control method thereof |
| CN102820803A (en) * | 2012-06-04 | 2012-12-12 | 苏州达方电子有限公司 | Three-port single-phase single-pole micro current converter and operating method thereof |
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