CN105515041A - Grid-connected inverter for providing active current and reactive current support for power grid - Google Patents
Grid-connected inverter for providing active current and reactive current support for power grid Download PDFInfo
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- CN105515041A CN105515041A CN201510897778.1A CN201510897778A CN105515041A CN 105515041 A CN105515041 A CN 105515041A CN 201510897778 A CN201510897778 A CN 201510897778A CN 105515041 A CN105515041 A CN 105515041A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The invention relates to a grid-connected inverter for providing active current and reactive current support for a power grid. The grid-connected inverter comprises a first inverter circuit, a second inverter circuit, a filter capacitor and a control circuit. The first inverter circuit comprises a first DC power, a first power switch, a first inductor, a second power switch, a third power switch, a first diode and a third diode. The second inverter circuit comprises a second DC power, a fourth power switch, a second inductor, a fifth power switch, a sixth power switch, a second diode and a sixth diode. The first inductor and the second inductor are connected with each other in a coupling way, and dotted terminals of the first inductor and the second inductor are arranged on the same side; and the control circuit can control the open and close of the first sixth power switch to sixth power switch according to a working mode signal and a first DC power voltage signal, a second DC power voltage signal and a network access circuit signal. The conducting loss and the switching loss of the grid-connected inverter are small, and the grid-connected inverter can provide the active current and reactive current support for the power grid.
Description
Technical field
The present invention relates to the combining inverter technology of electric power system, being specifically related to a kind of is the combining inverter that electrical network provides meritorious and reactive current is supported.
Background technology
Combining inverter is mainly used in the alternating current be transformed into by the direct current that energy device produces needed for electrical network.According to the difference of energy device, combining inverter generally can be divided into photovoltaic power generation grid-connected inverter, wind power-generating grid-connected inverter, power-equipment electricity generation grid-connecting inverter etc.
In the prior art, single-stage combining inverter comprises the single transformation combining inverter of single-stage, single-stage lifting press combining inverter.Wherein, the single transformation combining inverter of single-stage can be divided into voltage-source type combining inverter and current source type combining inverter.Fig. 1 shows a kind of circuit topology of voltage-source type combining inverter, and it can realize step-down inversion, and the peak value of the alternating voltage namely exported is less than the DC voltage value of input.Fig. 2 shows a kind of circuit topology of current source type combining inverter, and it can realize inversion of boosting, and the peak value of the alternating voltage namely exported is greater than the DC voltage value of input.In actual applications, regenerative resource is carried out generating electricity by way of merging two or more grid systems in process as DC power supply, its input direct voltage may one in a big way in change.Such as, in different temperatures situation, the direct voltage that same photovoltaic cell group produces may change within the scope of 300V-700V.Therefore, the application of the single transformation combining inverter of traditional single-stage is greatly limited.
Single-stage lifting press combining inverter comprises two kinds of typical circuit topologys, Z source grid-connected inverter (Z-source combining inverter) and Natural Soft-Switching combining inverter.Fig. 3 shows the circuit topology of Z source grid-connected inverter, and it realizes boosting or step-down inversion by stage circuit, decreases the quantity of power device.Fig. 4 shows the circuit topology of Natural Soft-Switching combining inverter.As the power switch S in Fig. 4
5time closed, it is equivalent to a direct current input side and is LC filter circuit, exchanges the voltage-source type combining inverter that outlet side is LCL filter circuit.As the power switch S in Fig. 4
5during disconnection, it is equivalent to one and exchanges the current source type combining inverter that outlet side is LCL filter circuit.Z-source inverter changes the character of Equivalent DC input power, makes it not only possess voltage source but also possess current source characteristic.Natural Soft-Switching inverter is in different operating demand stage, and its direct-current input power supplying presents voltage source or current source characteristic.At present, the principle of other single-stage lifting press combining inverters and this two classes combining inverter similar.But compared with conventional voltage source type interconnected inverter, this two classes combining inverter has a shortcoming, namely owing to being additionally connected in series one, two even multiple flat ripple inductance in its loop of power circuit, add extra power loss.
In the prior art, traditional two-stage grid-connected inverter is made up of Boost (boosting) DC-DC (DC-to-DC) circuit and inverter circuit, and the power switch in its two-stage circuit is all with high-frequency work, and switching loss is very large.In the prior art, a kind of two-stage time division type compound combining inverter is also comprised, as shown in Figure 5.In two-stage time division type compound combining inverter, when DC input voitage is lower than line voltage, now combining inverter can be equivalent to the current source inverter be operated under Boost (boosting) pattern; When DC input voitage is higher than line voltage, now combining inverter can be equivalent to the voltage source inverter be operated under Buck (step-down) pattern.Wherein, Fig. 6 and Fig. 7 sets forth two-stage time division type compound combining inverter be operated in Boost pattern and Buck pattern under view.Two-stage time division type compound combining inverter reduces switching loss, but during with Boost pattern high-frequency work, output filter is equivalent to CL-CL filter, although filter effect is strengthened, also brings power loss simultaneously and strengthens the problem strengthened with control difficulty.
For the defect of prior art, when the DC input voitage larger to excursion carries out 220V/380V low-pressure grid-connection, need one badly and can reduce various power loss, as switching loss, transmission line loss, the combining inverter of raising the efficiency.
Summary of the invention
The invention provides a kind of is the combining inverter that electrical network provides meritorious and reactive current is supported, not only have that inductive drop is little, conduction loss is little, switching loss is little, high efficiency advantage under high frequency, but also perceptual reactive current or the support of capacitive reactive power electric current can be provided for electrical network, further increase the performance of combining inverter.
Of the present inventionly provide meritorious for electrical network and the combining inverter of reactive current support comprises: the first inverter circuit, the second inverter circuit, filter capacitor and control circuit;
First inverter circuit comprises the first DC power supply, the first power switch, the first inductance, the second power switch, the 3rd power switch, the first diode and the 3rd diode; The positive pole of the first DC power supply is connected to one end of the first power switch, and the other end of the first power switch is connected to one end of the first inductance; The other end of the first inductance is connected to the anode tap of the 3rd diode; The cathode terminal of the 3rd diode is connected to one end of the 3rd power switch; The other end of the 3rd power switch is connected to one end of filter capacitor as output; The negative pole of the first DC power supply connects the other end of filter capacitor; The first diode in parallel between the negative pole and the other end of the first power switch of the first DC power supply, the other end of the anode termination filter capacitor of the first diode; The second power switch is connected with between the other end and the anode tap of the 3rd diode of filter capacitor.
Second inverter circuit comprises the second DC power supply, the 4th power switch, the second inductance, the 5th power switch, the 6th power switch, the second diode and the 6th diode; The negative pole of the second DC power supply is connected to one end of the second power switch, and the other end of the second power switch is connected to one end of the second inductance; The other end of the second inductance is connected to the negative end of hexode; The anode tap of the 6th diode is connected to one end of the 6th power switch; The other end of the 6th power switch is connected to one end of filter capacitor as output; The positive pole of the second DC power supply connects the other end of filter capacitor; The second diode in parallel between the positive pole and the other end of the 4th power switch of the second DC power supply, the other end of the negative electrode termination filter capacitor of the second diode; The 5th power switch is connected with between the other end and the cathode terminal of the 6th diode of filter capacitor.
First inductance of the first inverter circuit and the second inductance coupling high of the second inverter circuit link together, and the Same Name of Ends of the first inductance and the second inductance is positioned at the same side.
Described filter capacitor is used for the alternating current filtering exported the first inverter circuit and the second inverter circuit.
Described control circuit is used for according to the mode of operation signal from outside and the mains voltage signal from electrical network and networking current signal, and the controlled end of the to first to the 6th power switch sends the signal opening and close of control first to the 6th power switch; Wherein, described mode of operation signal comprises perception without function signal, capacitive reactive power signal, meritorious working signal and active reactive mixed signal.
Preferably, each power switch of first to the 6th power switch can be N channel depletion type field effect transistor, or by the multiple tube of N channel depletion type field effect transistor and diode combinations, and the anode tap of diode is connected to the source electrode of N channel depletion type field effect transistor, the cathode terminal of diode is connected to the drain electrode of N channel depletion type field effect transistor, and the grid of N channel field-effect pipe is as the controlled end of power switch.
The drain electrode of the N channel depletion type field effect transistor of the first power switch is connected to the positive pole of the first DC power supply, and source electrode is connected to one end of the first inductance; The drain electrode of the N channel depletion type field effect transistor of the second power switch is connected to the anode tap of the 3rd diode, and source electrode is connected to the other end of filter capacitor; The drain electrode of the N channel depletion type field effect transistor of the 3rd power switch is connected to the cathode terminal of the 3rd diode, and source electrode is as output; The source electrode of the N channel depletion type field effect transistor of the 4th power switch is connected to the negative pole of the second DC power supply, and drain electrode is connected to one end of the second inductance; The drain electrode of the N channel depletion type field effect transistor of the 5th power switch is connected to the other end of filter capacitor, and source electrode is connected to the cathode terminal of the 6th diode; The source electrode of the N channel depletion type field effect transistor of the 6th power switch is connected to the anode tap of the 6th diode, drains as output.
Preferably, described combining inverter also comprises the 3rd inductance.One end of 3rd inductance is connected with one end of filter capacitor, and the other end of the 3rd inductance is connected with one end of electrical network, and the other end of electrical network is connected with the other end of filter capacitor.
Preferably, when the mode of operation signal received is that perception is without function signal or capacitive reactive power signal, or, gain merit and the idle mixed signal of perception, or, during meritorious and capacitive reactive power mixed signal, described control circuit is according to from the first DC power supply and the voltage signal of the second DC power supply, the voltage signal of electrical network and networking current signal, and the controlled end transmission control first of the to first to the 6th power switch comprises to the signal opened and close of the 6th power switch:
0 is more than or equal to and the electric current that networks is less than in the time interval of 0 at line voltage, control circuit sends cut-off signal to turn off the 3rd power switch to the controlled end of the 3rd power switch, controlled end to the 6th power switch sends pwm signal and makes the 6th power switch according to PWM mode work, to the second inductance discharge and recharge, comprise: closed 6th power switch, to the second induction charging; When networking electric current reaches the first predetermined value, turn off the 6th power switch, make the energy of the second inductance be recycled into the first DC power supply with coupled modes by the diode of the first inductance, the first power switch and the diode of the second power switch;
0 is more than or equal to and line voltage is more than or equal in the time interval of 0 at networking electric current, the controlled end of control circuit to first to the 3rd power switch transmits control signal, the controlled end of the to the 4th to the 6th power switch sends cut-off signal, makes the energy of the first DC power supply be injected into electrical network on request;
0 is more than or equal to and line voltage is less than in the time interval of 0 at networking electric current, control circuit sends cut-off signal to turn off the 6th power switch to the controlled end of the 6th power switch, controlled end to the 3rd power switch sends pwm signal and makes the 3rd power switch according to PWM mode work, to the first inductance discharge and recharge, comprise: open the 3rd power switch, to the first induction charging; When networking electric current reaches the second predetermined value, turn off the 3rd power switch, make the energy of the first inductance be recycled into the second DC power supply with coupled modes by the diode of the second inductance, the 4th power switch and the diode of the 5th power switch;
0 is less than and line voltage is less than in the time interval of 0 at networking electric current, the controlled end of control circuit the to the 4th to the 6th power switch transmits control signal, the controlled end of the to first to the 3rd power switch sends cut-off signal, makes the energy of the second DC power supply be injected into electrical network on request.
Preferably, when the mode of operation signal received is marker signal, described control circuit is according to from the first DC power supply and the voltage signal of the second DC power supply, the mains voltage signal of electrical network and networking current signal, and the controlled end of the to first to the 6th power switch sends control first to the signal opened and close of the 6th power switch and comprises:
If determine the amplitude of DC input voitage higher than line voltage of the first DC power supply, when the positive half cycle of line voltage, control circuit makes the field effect transistor of the 3rd power switch often open, the field effect transistor high-frequency work of the first power switch, the field effect transistor of the second power switch, the 4th to the 6th power switch disconnects; If determine that the amplitude of the DC input voitage of the second DC power supply higher than line voltage control circuit when the negative half period of line voltage makes the field effect transistor of the 6th power switch often open, the field effect transistor high-frequency work of the 4th power switch, the field effect transistor of the first to the 3rd power switch and the field effect transistor of the 5th power switch disconnect.
If determine the amplitude of DC input voitage lower than line voltage of the first DC power supply, when the positive half cycle of line voltage, control circuit carries out following operation: when absolute value lower than the instantaneous value of line voltage of the DC input voitage of the first DC power supply, the field effect transistor of the first power switch and the 3rd power switch is often opened, the field effect transistor high-frequency work of the second power switch, the field effect transistor of the 4th to the 6th power switch disconnects; When absolute value higher than the instantaneous value of line voltage of the DC input voitage of the first DC power supply, the field effect transistor of the 3rd power switch is often opened, the field effect transistor high-frequency work of the first power switch, the field effect transistor of the second power switch, the 4th to the 6th power switch disconnects; If determine the amplitude of DC input voitage lower than line voltage of the second DC power supply, when the negative half period of line voltage, control circuit carries out following operation: when absolute value lower than the instantaneous value of line voltage of the DC input voitage of the second DC power supply, the field effect transistor of the 4th and the 6th power switch is often opened, the field effect transistor high-frequency work of the 5th power switch, the field effect transistor of the first to the 3rd power switch disconnects; When absolute value higher than the instantaneous value of line voltage of the DC input voitage of the secondth DC power supply, the field effect transistor of the 6th power switch is often opened, the field effect transistor high-frequency work of the 4th power switch, the field effect transistor of the first to the 3rd power switch and the field effect transistor of the 5th power switch disconnect.
Of the present invention is the combining inverter that electrical network provides meritorious and reactive current is supported, is connected because the first inverter circuit intercouples with two inductance of the second inverter circuit, therefore, it is possible to provide perceptual reactive current or the support of capacitive reactive power electric current for electrical network.The state of the closed and disconnected of the first to the 6th power switch is controlled by control circuit, make the reactive power in electrical network can be recycled into the first DC power supply or the second DC power supply, and by controlling the closed and disconnected state of the first to the 6th power switch, make in the energy injection electrical network of the first DC power supply or the second DC power supply, thus between DC power supply and AC network, realize conversion, the transmission of reactive power and active power.Further, the present invention is owing to adopting MOS type field effect transistor (MOSFET) as device for power switching, and conduction loss is very little.In addition, owing to only having a power switch to be operated in high frequency state in this inverter at any time, switching loss is little, and then makes inverter of the present invention keep high efficiency under high-frequency work state.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art voltage source combining inverter topology;
Fig. 2 is the circuit diagram of prior art current source combining inverter topology;
Fig. 3 is the circuit diagram of prior art Z source grid-connected inverter topology;
Fig. 4 is the circuit diagram of prior art Natural Soft-Switching combining inverter topology;
Fig. 5 is the circuit diagram of prior art two-stage time division type compound combining inverter;
Fig. 6 is Boost (boosting) working state figure of two-stage time division type compound combining inverter;
Fig. 7 is Buck (step-down) working state figure of two-stage time division type compound combining inverter;
The partial circuit schematic diagram for the combining inverter that electrical network provides meritorious and reactive current is supported that Fig. 8 is the embodiment of the present invention;
Fig. 9 is the control circuit schematic diagram of the combining inverter according to the embodiment of the present invention;
Figure 10 is the line voltage of the combining inverter of embodiment of the present invention when working in the idle mixed mode of meritorious and perception and the oscillogram of networking electric current;
Figure 11 is that the combining inverter of the embodiment of the present invention works in the oscillogram of gaining merit with line voltage during capacitive reactive power mixed mode and networking electric current;
100, the first inverter circuit; 200, the second inverter circuit; 300, control circuit; E
1, the first DC power supply; S
1, the first power switch; D
1, the first diode; L
p, the first inductance; S
2, the second power switch; D
3, the 3rd diode; S
3, the 3rd power switch; E
2, the second DC power supply; S
4, the 4th power switch; D
2, the second diode; L
n, the second inductance; S
5, the 5th power switch; D
5, the 5th diode; D
6, the 6th diode; S
6, the 6th power switch; L, the 3rd inductance; C, filter capacitor; V
g, electrical network.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in specification are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
For the defect of prior art, the invention provides a kind of is the combining inverter that electrical network provides meritorious and reactive current is supported.Main thought of the present invention is, devises a kind of new combining inverter, comprises the first inverter circuit, the second inverter circuit, filter capacitor and control circuit.Wherein, the first inverter circuit comprises the first DC power supply, the first power switch, the first inductance, the second power switch, the 3rd power switch, the first diode and the 3rd diode.Second inverter circuit comprises the second DC power supply, the 4th power switch, the second inductance, the 5th power switch, the 6th power switch, the second diode and the 6th diode.Further, the first inductance of the first inverter circuit and the second inductance coupling high of the second inverter circuit link together, and the Same Name of Ends of the first inductance and the second inductance is positioned at the same side.On the basis of first, second inverter circuit of the combining inverter of design, controlled the state of the closed and disconnected of the first to the 6th power switch by control circuit, thus meritorious and reactive current support can be provided for electrical network.
The technical scheme of embodiments of the invention is described in detail below in conjunction with accompanying drawing 8-11.Wherein, Fig. 8 shows the partial circuit schematic diagram for the combining inverter that electrical network provides meritorious and reactive current is supported according to the embodiment of the present invention, and Fig. 9 shows the control circuit schematic diagram of the combining inverter according to the embodiment of the present invention.As shown in Figure 8 and Figure 9, the first inverter circuit 100, second inverter circuit 200, filter capacitor C and control circuit 300 is comprised for electrical network provides meritorious with the combining inverter of reactive current support in the embodiment of the present invention.First inverter circuit 100 comprises the first DC power supply E
1, the first power switch S
1, the first inductance L
p, the second power switch S
2, the 3rd power switch S
3, the first diode D
1with the 3rd diode D
3.In the first inverter circuit 100, the first DC power supply E
1positive pole be connected to the first power switch S
1one end, the first power switch S
1the other end be connected to the first inductance L
pone end; First inductance L
pthe other end be connected to the 3rd diode D
3anode tap; 3rd diode D
3cathode terminal be connected to the 3rd power switch S
3one end; 3rd power switch S
3the other end be connected to one end of filter capacitor C as output; First DC power supply E
1negative pole connect the other end of filter capacitor C; At the first DC power supply E
1negative pole and the first power switch S
1the other end between the first diode D in parallel
1, the first diode D
1the other end of anode termination filter capacitor C; At filter capacitor C and the 3rd diode D
3anode tap between be connected with the second power switch S
2.
Second inverter circuit 200 comprises the second DC power supply E
2, the 4th power switch S
4, the second inductance L
n, the 5th power switch S
5, the 6th power switch S
6, the second diode D
2with the 6th diode D
6.Second DC power supply E
2negative pole be connected to the 4th power switch S
4one end, the 4th power switch S
4the other end be connected to the second inductance L
none end; Second inductance L
nthe other end be connected to the 6th diode D
6negative end; 6th diode D
6anode tap be connected to the 6th power switch S
6one end; 6th power switch S
6the other end be connected to one end of filter capacitor C as output; Second DC power supply E
2positive pole connect the other end of filter capacitor C; At the second DC power supply E
2positive pole and the 4th power switch S
4the other end between the second diode D in parallel
2, the second diode D
2the other end of negative electrode termination filter capacitor C; At the other end and the 6th diode D of filter capacitor C
6cathode terminal between be connected with the 5th power switch S
5.
The first inductance L in first inverter circuit 100
pwith the second inductance L of the second inverter circuit 200
nbe of coupled connections together, and the first inductance L
pwith the second inductance L
nsame Name of Ends be positioned at the same side.Filter capacitor C is used for the alternating current filtering exported the first inverter circuit 100 and the second inverter circuit 200.Control circuit 300 is for according to the mode of operation signal from outside and the mains voltage signal from electrical network and networking current signal, and the controlled end of the to first to the 6th power switch sends the signal opening and close of control first to the 6th power switch; Wherein, described mode of operation signal comprises perception without function signal, capacitive reactive power signal and meritorious working signal, active reactive mixed signal.
In the embodiment shown in fig. 8, preferably, each power switch of first to the 6th power switch can be N channel depletion type field effect transistor, or by the multiple tube of N channel depletion type field effect transistor and diode combinations, and the anode tap of diode is connected to the source electrode of N channel depletion type field effect transistor, the cathode terminal of diode is connected to the drain electrode of N channel depletion type field effect transistor.The grid of N channel field-effect pipe is as the controlled end of power switch.In actual use, the N-channel MOS type field effect transistor (MOSFET) in the present invention also can be replaced by other full control device, such as insulated gate bipolar transistor (IGBT).It will be understood by those skilled in the art that the of the present invention first to the 6th power switch is not limited to the concrete structure shown in Fig. 8, other circuit that can realize principle of the present invention and function is also in protection scope of the present invention.When the first to the 6th power switch is N channel depletion type field effect transistor, the first power switch S
1drain electrode be connected to the first DC power supply E
1positive pole, the first power switch S
1source electrode be connected to the first inductance L
pone end; Second power switch S
2drain electrode be connected to the 3rd diode D
3anode tap, the second power switch S
2source electrode be connected to the other end of filter capacitor C; 3rd power switch S
3drain electrode be connected to the 3rd diode D
3cathode terminal, the 3rd power switch S
3source electrode as output; 4th power switch S
4source electrode be connected to the second DC power supply E
2negative pole, the 4th power switch S
4drain electrode be connected to the second inductance L
none end; 5th power switch S
5drain electrode be connected to the other end of filter capacitor C, the 5th power switch S
5source electrode be connected to the 6th diode D
6cathode terminal; 6th power switch S
6source electrode be connected to the 6th diode D
6anode tap, the 6th power switch S
6drain electrode as output.
Preferably, combining inverter also comprises the 3rd inductance L.One end of 3rd inductance L is connected with one end of filter capacitor C, the other end of the 3rd inductance L and electrical network V
gone end be connected, and electrical network V
gthe other end be connected with the other end of filter capacitor C.In some reality uses, the 3rd inductance L also can be replaced by the line inductance of reality or transformer leakage inductance, thus makes the device in combining inverter less.It will be understood by those skilled in the art that in the present invention, the filter of AC is not limited to the concrete structure shown in Fig. 8, other circuit that can realize principle of the present invention and function is also in protection scope of the present invention.
When the mode of operation signal that control circuit 300 receives be perceptual without function signal, capacitive reactive power signal or active reactive mixed signal time, control circuit 300 according to from the first DC power supply and the voltage signal of the second DC power supply, the voltage signal of electrical network and networking current signal, to the first to the 6th power switch S
1-S
6control, comprising:
Be more than or equal to 0 and the electric current that networks is less than in the time interval of 0 at line voltage, turn off the 3rd power switch S
3, make the 6th power switch S
6work, to the second inductance L according to pulse width modulation (PWM) mode
ndischarge and recharge; 0 is more than or equal to and line voltage is more than or equal in the time interval of 0, control circuit to first to the 3rd power switch S at networking electric current
1-S
3controlled end transmit control signal, the to the 4th to the 6th power switch S
4-S
6controlled end send cut-off signal, make the first DC power supply E
1energy be injected into electrical network according to the demand of electrical network; Be more than or equal to 0 and line voltage is less than in the time interval of 0 at networking electric current, turn off the 6th power switch S
6, make the 3rd power switch S
3according to PWM mode work, to the first inductance L
pdischarge and recharge; 0 is less than and line voltage is less than in the time interval of 0, control circuit the to the 4th to the 6th power switch S at networking electric current
4-S
6controlled end transmit control signal, the to first to the 3rd power switch S
1-S
3controlled end send cut-off signal, make the second DC power supply E
2energy be injected into electrical network on request.
The mode of operation signal received with control circuit 300 is below meritorious and the idle mixed signal of perception, meritorious and capacitive reactive power mixed signal is described in detail.
When the mode of operation signal received mixed signal idle for meritorious and perception, control circuit 300 is according to from the first DC power supply E
1with the second DC power supply E
2the d. c. voltage signal, the electrical network V that export
gvoltage signal and networking current signal, the controlled end of the to first to the 6th power switch sends control first to the signal opened and close of the 6th power switch and proceeds as follows.0 is more than or equal to and the electric current that the networks time interval that is less than 0, i.e. 0 ~ t as shown in Figure 10 at line voltage
1time period, control circuit 300 is to the 3rd power switch S
3controlled end, the such as grid of N channel depletion type field effect transistor, send cut-off signal to turn off the 3rd power switch S
3, to the 6th power switch S
6controlled end, the such as grid of N channel depletion type field effect transistor, send pulse width modulation (PWM) signal make the 6th power switch S
6according to PWM mode high-frequency work, discharge and recharge is carried out to the second inductance, specifically comprises: closed 6th power switch S
6, to the second inductance L
ncharge, thus make combining inverter of the present invention will from electrical network V
genergy storage to the second inductance L
nin; When networking electric current reaches the first predetermined value, turn off the 6th power switch S
6, make the second inductance L
nenergy with coupled modes by the first inductance L
p, the first power switch S
1the diode of parallel connection or body diode, and the second power switch S
2the diode of parallel connection or body diode, be recycled into the first DC power supply E
1.In the embodiment of the present invention, the first predetermined value is that the given value of current reference signal that comprehensively obtained according to the direct voltage of sampling, line voltage and electrical network command signal by control circuit 300 is at 0 ~ t
1the instantaneous value of time period.0 is more than or equal to and line voltage is more than or equal in the time interval of 0, i.e. t as shown in Figure 10 at networking electric current
1~ t
2time period, control circuit 300 to first to the 3rd power switch S
3controlled end transmit control signal, the to the 4th to the 6th power switch S
4-S
6controlled end send cut-off signal, make the first DC power supply E
1energy injection to electrical network V
g.0 is more than or equal to and line voltage is less than in the time interval of 0, i.e. t as shown in Figure 10 at networking electric current
2~ t
3time period in, control circuit 300 is to the 6th power switch S
6controlled end send cut-off signal to turn off the 6th power switch S
6, and to the 3rd power switch S
3controlled end send pulse width modulation (PWM) signal make the 3rd power switch S
3according to PWM mode high-frequency work, to the first inductance L
pcarry out discharge and recharge, specifically comprise: closed 3rd power switch S
3, to the first inductance L
pcharge, make combining inverter of the present invention will from electrical network V
genergy storage to the first inductance L
pin; When networking electric current reaches the second predetermined value, turn off the 3rd power switch S
3, thus make the first inductance L
pthe energy of middle storage passes through the second inductance L with coupled modes
n, the 4th power switch S
4the diode of parallel connection and the 5th power switch S
5diode in parallel is recycled into the second DC power supply E
2.Equally, the second predetermined value is that the given value of current reference signal that comprehensively obtained according to the direct voltage of sampling, line voltage and electrical network command signal by control circuit 300 is at t
2~ t
3the instantaneous value of time period.In the time interval that networking electric current is less than 0 and line voltage is less than, i.e. t as shown in Figure 10
3~ t
4in time period, the controlled end of control circuit 300 the to the 4th to the 6th power switch transmits control signal, and the controlled end of the to first to the 3rd power switch sends cut-off signal, makes the second DC power supply E
2energy injection to electrical network V
g.Wherein, it should be noted that at t as shown in Figure 10
1~ t
2time period control circuit to first to the 3rd power switch transmits control signal and comprises two kinds of situations: the relation namely between the d. c. voltage signal that exports according to first, second DC power supply of control circuit and mains voltage signal amplitude, makes first, second inverter circuit work in Buck pattern or Buck+Boost+Buck pattern.Similar, at t as shown in the figure
3~ t
4the transmission of time period control circuit the to the 4th to the 6th power switch is opened signal and is also comprised above-mentioned two situations.
When the mode of operation signal that control circuit 300 receives is for meritorious and capacitive reactive power mixed signal, control circuit 300 is according to from the first DC power supply E
1with the second DC power supply E
2the d. c. voltage signal, the electrical network V that export
gvoltage signal and networking current signal, the controlled end of the to first to the 6th power switch sends control first to the signal opened and close of the 6th power switch and proceeds as follows.0 is more than or equal to and the electric current that networks is more than or equal in the time interval of 0, i.e. 0 ~ t as shown in figure 11 at line voltage
1time period, the controlled end of control circuit 300 to first to the 3rd power switch transmits control signal, and the controlled end of the to the 4th to the 6th power switch sends cut-off signal, makes the first DC power supply E
1energy injection to electrical network V
gin.
Be more than or equal to 0 at line voltage, and the electric current that networks is less than or equal in the time interval of 0, i.e. t as shown in figure 11
1~ t
2in time period, control circuit 300 is to the 3rd power switch S
3controlled end send cut-off signal to turn off the 3rd power switch S
3, to the 6th power switch S
6controlled end send pulse width modulation (PWM) signal make the 6th power switch S
6according to PWM mode high-frequency work, to the second inductance L
ndischarge and recharge, specifically comprises: closed 6th power switch S
6, make combining inverter of the present invention will from electrical network V
genergy storage to the second inductance L
nin; When networking electric current reaches the first predetermined value, turn off the 6th power switch S
6, make the second inductance L
nenergy with coupled modes by the first inductance L
p, the first power switch S
1diode in parallel or body diode, and the second power switch S
2diode in parallel or body diode, be recycled into the first DC power supply E
1.
Be less than 0 at line voltage, and the electric current that networks is less than in the time interval of 0, i.e. t as shown in figure 11
2~ t
3in time period, the controlled end of control circuit 300 the to the 4th to the 6th power switch transmits control signal, and the controlled end of the to first to the 3rd power switch sends cut-off signal, makes the second DC power supply E
2energy injection to electrical network V
gin.
Be less than 0 at line voltage, and the electric current that networks is more than or equal in the time interval of 0, i.e. t as shown in figure 11
3~ t
4in time period, control circuit 300 is to the 6th power switch S
6controlled end send cut-off signal to turn off the 6th power switch, and to the 3rd power switch S
3controlled end send pulse width modulation (PWM) signal make the 3rd power switch S
3according to PWM mode high-frequency work, to the first inductance L
pdischarge and recharge, specifically comprises: closed 3rd power switch S
3, to the first inductance L
pcharging, makes combining inverter of the present invention will from electrical network V
genergy storage to the first inductance L
pin; When networking electric current reaches the second predetermined value, turn off the 3rd power switch S
3, make the first inductance L
penergy with coupled modes by the second inductance L
n, the 4th power switch S
4diode in parallel or body diode, and the 5th power switch S
5diode in parallel or body diode, be recycled into the second DC power supply E
2.
Wherein, it should be noted that at 0 ~ t as shown in figure 11
1in time period, control circuit to first to the 3rd power switch S
1-S
3transmit control signal and comprise two kinds of situations: namely control circuit is according to the relation between the d. c. voltage signal of the first DC power supply and mains voltage signal amplitude, make the first inverter circuit work in Buck pattern or Buck+Boost+Buck pattern.Similar, as shown in figure 11 and t
2~ t
3time period control circuit the to the 4th to the 6th power switch transmits control signal and also comprises above-mentioned two situations.
Preferably, when the mode of operation signal that control circuit 300 receives is for meritorious working signal, control circuit 300 makes inverter work as follows according to the voltage signal of the direct voltage exported from first, second DC power supply, electrical network and networking current signal.If determine the first DC power supply E
1dC input voitage higher than the amplitude of line voltage, when the positive half cycle of line voltage, control circuit 300 makes the 3rd power switch S
3chang Kai, the first power switch S
1high-frequency work, the second power switch S
2, the 4th to the 6th power switch S
4-S
6disconnect.If determine the second DC power supply E
2the amplitude of DC input voitage higher than line voltage time, when the negative half period of line voltage, control circuit 300 makes the 6th power switch S
6chang Kai, the 4th power switch S
4high-frequency work, the first to the 3rd power switch S
1-S
3with the 5th power switch S
5disconnect.
When the mode of operation signal that control circuit 300 receives is for meritorious working signal, if determine the first DC power supply E
1lower than the amplitude of line voltage, at the positive half cycle of line voltage, control circuit 300 carries out following operation: when absolute value lower than line voltage instantaneous value of the DC input voitage of the first DC power supply, make the first power switch S
1with the 3rd power switch S
3field effect transistor often open, the second power switch S
2field effect transistor high-frequency work, the 4th to the 6th power switch S
4-S
6field effect transistor disconnect; When absolute value higher than line voltage instantaneous value of the DC input voitage of the first DC power supply, make the 3rd power switch S
3field effect transistor often open, the first power switch S
1field effect transistor high-frequency work, the second power switch S
2, the 4th to the 6th power switch S
4-S
6field effect transistor disconnect; When the negative half period of line voltage, control circuit carries out following operation: if determine the second DC power supply E
2lower than the amplitude of line voltage, at the negative half period of line voltage, control circuit 300 carries out following operation: when absolute value lower than line voltage instantaneous value of the DC input voitage of the second DC power supply, make the 4th power switch S
4with the 6th power switch S
6field effect transistor often open, the 5th power switch S
5field effect transistor high-frequency work, the first to the 3rd power switch S
1-S
3field effect transistor disconnect; When absolute value higher than the instantaneous value of line voltage of the DC input voitage of the second DC power supply, make the 6th power switch S
6field effect transistor often open, the 4th power switch S
4field effect transistor high-frequency work, the first to the 3rd power switch S
1-S
3field effect transistor and the 5th power switch S
5field effect transistor disconnect.
The embodiment of the present invention be the combining inverter that electrical network provides meritorious and reactive current is supported, compared with various conventional inverter of the prior art, there is the advantage that loop of power circuit inductive drop is little.Be connected because the first inverter circuit intercouples with two inductance of the second inverter circuit, therefore, it is possible to provide perceptual reactive current or the support of capacitive reactive power electric current for electrical network.The state of the closed and disconnected of the first to the 6th power switch is controlled by control circuit, make the reactive power in electrical network can be recycled into the first DC power supply or the second DC power supply, and by controlling the closed and disconnected state of the first to the 6th power switch, make in the energy injection electrical network of the first DC power supply or the second DC power supply, thus between DC power supply and AC network, realize conversion, the transmission of reactive power and active power.
Further, the present invention is owing to adopting MOS type field effect transistor (MOSFET) as device for power switching, and conduction loss is very little.In addition, owing to only having a power switch to be operated in high frequency state in this inverter at any time, switching loss is little, and then makes inverter of the present invention keep high efficiency under high-frequency work state.In addition, during reality uses, the 3rd inductance L also can be replaced by the line inductance of reality or transformer leakage inductance, thus makes the device in combining inverter less.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (5)
1. be the combining inverter that electrical network provides meritorious and reactive current is supported, it is characterized in that, described combining inverter comprises the first inverter circuit, the second inverter circuit, filter capacitor and control circuit;
First inverter circuit comprises the first DC power supply, the first power switch, the first inductance, the second power switch, the 3rd power switch, the first diode and the 3rd diode; The positive pole of the first DC power supply is connected to one end of the first power switch, and the other end of the first power switch is connected to one end of the first inductance; The other end of the first inductance is connected to the anode tap of the 3rd diode; The cathode terminal of the 3rd diode is connected to one end of the 3rd power switch; The other end of the 3rd power switch is connected to one end of filter capacitor as output; The negative pole of the first DC power supply connects the other end of filter capacitor; The first diode in parallel between the negative pole and the other end of the first power switch of the first DC power supply, the other end of the anode termination filter capacitor of the first diode; The second power switch is connected with between the other end and the anode tap of the 3rd diode of filter capacitor;
Second inverter circuit comprises the second DC power supply, the 4th power switch, the second inductance, the 5th power switch, the 6th power switch, the second diode and the 6th diode; The negative pole of the second DC power supply is connected to one end of the 4th power switch, and the other end of the 4th power switch is connected to one end of the second inductance; The other end of the second inductance is connected to the cathode terminal of the 6th diode; The anode tap of the 6th diode is connected to one end of the 6th power switch; The other end of the 6th power switch is connected to one end of filter capacitor as output; The positive pole of the second DC power supply connects the other end of filter capacitor; The second diode in parallel between the positive pole and the other end of the 4th power switch of the second DC power supply, the other end of the negative electrode termination filter capacitor of the second diode; The 5th power switch is connected with between the other end and the cathode terminal of the 6th diode of filter capacitor;
First inductance of the first inverter circuit and the second inductance coupling high of the second inverter circuit link together, and the Same Name of Ends of the first inductance and the second inductance is positioned at the same side;
Described filter capacitor is used for the alternating current filtering exported the first inverter circuit and the second inverter circuit;
Described control circuit is used for basis from the mode of operation signal of outside and from the first DC power supply and the voltage signal of the second DC power supply, the mains voltage signal of electrical network and networking current signal, and the controlled end of the to first to the 6th power switch sends the signal opening and close of control first to the 6th power switch; Wherein, described mode of operation signal comprises perception without function signal, capacitive reactive power signal, meritorious working signal and meritorious and idle mixed signal.
2. combining inverter as claimed in claim 1, wherein, each power switch of first to the 6th power switch can be N channel depletion type field effect transistor, or by the multiple tube of N channel depletion type field effect transistor and diode combinations, and the anode tap of diode is connected to the source electrode of N channel depletion type field effect transistor, the cathode terminal of diode is connected to the drain electrode of N channel depletion type field effect transistor, and the grid of N channel field-effect pipe is as the controlled end of power switch;
The drain electrode of the N channel depletion type field effect transistor of the first power switch is connected to the positive pole of the first DC power supply, and source electrode is connected to one end of the first inductance;
The drain electrode of the N channel depletion type field effect transistor of the second power switch is connected to the anode tap of the 3rd diode, and source electrode is connected to the other end of filter capacitor;
The drain electrode of the N channel depletion type field effect transistor of the 3rd power switch is connected to the cathode terminal of the 3rd diode, and source electrode is as output;
The source electrode of the N channel depletion type field effect transistor of the 4th power switch is connected to the negative pole of the second DC power supply, and drain electrode is connected to one end of the second inductance;
The drain electrode of the N channel depletion type field effect transistor of the 5th power switch is connected to the other end of filter capacitor, and source electrode is connected to the cathode terminal of the 6th diode;
The source electrode of the N channel depletion type field effect transistor of the 6th power switch is connected to the anode tap of the 6th diode, drains as output.
3. combining inverter as claimed in claim 1, wherein, described combining inverter also comprises the 3rd inductance;
One end of 3rd inductance is connected with one end of filter capacitor, and the other end of the 3rd inductance is connected with one end of electrical network, and the other end of electrical network is connected with the other end of filter capacitor.
4. combining inverter as claimed in claim 2, wherein, when the mode of operation signal received is that perception is without function signal or capacitive reactive power signal, or, gain merit and the idle mixed signal of perception, or, when gaining merit with capacitive reactive power mixed signal, described control circuit is according to from the first DC power supply and the voltage signal of the second DC power supply, the voltage signal of electrical network and networking current signal, and the controlled end of the to first to the 6th power switch sends control first to the signal opened and close of the 6th power switch and comprises:
0 is more than or equal to and the electric current that networks is less than in the time interval of 0 at line voltage, control circuit sends cut-off signal to turn off the 3rd power switch to the controlled end of the 3rd power switch, controlled end to the 6th power switch sends pwm signal and makes the 6th power switch according to PWM mode work, to the second inductance discharge and recharge, comprise: closed 6th power switch, to the second induction charging; When networking electric current reaches the first predetermined value, turn off the 6th power switch, make the energy of the second inductance be recycled into the first DC power supply with coupled modes by the diode of the first inductance, the first power switch and the diode of the second power switch;
0 is more than or equal to and line voltage is more than or equal in the time interval of 0 at networking electric current, the controlled end of control circuit to first to the 3rd power switch transmits control signal, the controlled end of the to the 4th to the 6th power switch sends cut-off signal, makes the energy of the first DC power supply be injected into electrical network according to the demand of electrical network;
0 is more than or equal to and line voltage is less than in the time interval of 0 at networking electric current, control circuit sends cut-off signal to turn off the 6th power switch to the controlled end of the 6th power switch, controlled end to the 3rd power switch sends pwm signal and makes the 3rd power switch according to PWM mode work, to the first inductance discharge and recharge, comprise: open the 3rd power switch, to the first induction charging, when networking electric current reaches the second predetermined value, turn off the 3rd power switch, make the energy of the first inductance with coupled modes by the second inductance, the diode of the 4th power switch and the diode of the 5th power switch are recycled into the second DC power supply,
0 is less than and line voltage is less than in the time interval of 0 at networking electric current, the controlled end of control circuit the to the 4th to the 6th power switch transmits control signal, the controlled end of the to first to the 3rd power switch sends cut-off signal, makes the energy of the second DC power supply be injected into electrical network on request.
5. combining inverter as claimed in claim 2, wherein, when the mode of operation signal received is for meritorious working signal, described control circuit is according to from the voltage signal of first, second DC power supply, the mains voltage signal of electrical network and networking current signal, and the controlled end of the to first to the 6th power switch sends control first to the signal opened and close of the 6th power switch and comprises:
If determine the amplitude of DC input voitage higher than line voltage of the first DC power supply, when the positive half cycle of line voltage, control circuit makes the field effect transistor of the 3rd power switch often open, the field effect transistor high-frequency work of the first power switch, the field effect transistor of the second power switch, the 4th to the 6th power switch disconnects; If determine the amplitude of DC input voitage higher than line voltage of the second DC power supply, when the negative half period of line voltage, control circuit makes the field effect transistor of the 6th power switch often open, the field effect transistor high-frequency work of the 4th power switch, the field effect transistor of the first to the 3rd power switch and the field effect transistor of the 5th power switch disconnect;
If determine the amplitude of DC input voitage lower than line voltage of the first DC power supply, following operation is carried out: when absolute value lower than the instantaneous value of line voltage of the DC input voitage of the first DC power supply at the positive half cycle control circuit of line voltage, the field effect transistor of the first power switch and the 3rd power switch is often opened, the field effect transistor high-frequency work of the second power switch, the field effect transistor of the 4th to the 6th power switch disconnects; When absolute value higher than the instantaneous value of line voltage of the DC input voitage of the first DC power supply, the field effect transistor of the 3rd power switch is often opened, the field effect transistor high-frequency work of the first power switch, the field effect transistor of the second power switch, the 4th to the 6th power switch disconnects; If determine the amplitude of DC input voitage lower than line voltage of the second DC power supply, when the negative half period of line voltage, control circuit carries out following operation: when absolute value lower than the instantaneous value of line voltage of the DC input voitage of the second DC power supply, the field effect transistor of the 4th and the 6th power switch is often opened, the field effect transistor high-frequency work of the 5th power switch, the field effect transistor of the first to the 3rd power switch disconnects; When absolute value higher than the instantaneous value of line voltage of the DC input voitage of the second DC power supply, the field effect transistor of the 6th power switch is often opened, the field effect transistor high-frequency work of the 4th power switch, the field effect transistor of the first to the 3rd power switch and the field effect transistor of the 5th power switch disconnect.
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| CN201510897778.1A CN105515041B (en) | 2015-12-08 | 2015-12-08 | The combining inverter of active and reactive current support is provided for power network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116565980A (en) * | 2023-07-11 | 2023-08-08 | 麦田能源股份有限公司 | Inverter system with reactive support and control method thereof |
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| US6104624A (en) * | 1999-03-15 | 2000-08-15 | Mitsubishi Denki Kabushiki Kaisha | System connecting device |
| CN102694479A (en) * | 2012-05-25 | 2012-09-26 | 华为技术有限公司 | Power electronic circuit |
| CN103107728A (en) * | 2013-03-05 | 2013-05-15 | 上海海事大学 | Voltage and current mixed source type grid-connected inverter topology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6104624A (en) * | 1999-03-15 | 2000-08-15 | Mitsubishi Denki Kabushiki Kaisha | System connecting device |
| CN102694479A (en) * | 2012-05-25 | 2012-09-26 | 华为技术有限公司 | Power electronic circuit |
| CN103107728A (en) * | 2013-03-05 | 2013-05-15 | 上海海事大学 | Voltage and current mixed source type grid-connected inverter topology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116565980A (en) * | 2023-07-11 | 2023-08-08 | 麦田能源股份有限公司 | Inverter system with reactive support and control method thereof |
| CN116565980B (en) * | 2023-07-11 | 2023-09-19 | 麦田能源股份有限公司 | Inverter system with reactive support and control method thereof |
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