CN102868312B - Inverse method and device - Google Patents
Inverse method and device Download PDFInfo
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- CN102868312B CN102868312B CN201210393882.3A CN201210393882A CN102868312B CN 102868312 B CN102868312 B CN 102868312B CN 201210393882 A CN201210393882 A CN 201210393882A CN 102868312 B CN102868312 B CN 102868312B
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Abstract
The present embodiments relate to a kind of inverse method and inverter.Described device includes: power inverter, for exporting the first running voltage or the second running voltage, described first running voltage includes the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage includes the power frequency sinusoidal voltage of superposition the second DC voltage, described first DC voltage specifically includes the DC voltage after described power inverter carries out Voltage Cortrol, and described second DC voltage specifically includes and carries out the DC voltage after Voltage Cortrol without described power inverter；Inverter, is used for receiving described first running voltage or described second running voltage, processes described first running voltage or described second running voltage, and described first running voltage or described second running voltage after processing provide to output loading.
Description
Technical field
The present invention relates to field of power supplies, particularly relate to a kind of inverse method and device.
Background technology
At present, new energy resources system, communication system is growing to the requirement of supply unit, and supply unit, as the key component of power conversion in new forms of energy or communication system, should meet the standard of high efficiency, high power density, high reliability.
Supply unit in new energy resources system or communication system uses high-frequency chain inverter to power, the circuit framework of high-frequency chain inverter includes, prime DC to DC converter (DC/DC) and rear class inverter, wherein, rear class inverter is generally divided into single-phase, and three-phase inverter.
In the prior art, the output voltage of DC to DC converter is a sinusoidal half-wave voltage (being regarded as the form of a kind of DC voltage)；Rear class inverter is operated in the power frequency state identical with mains frequency.
In high-frequency chain inverter of the prior art, owing to rear class inverter works in power frequency state, can reduce power switch pipe and the switching loss of filter inductance in rear class inverter, the output voltage of prime DC to DC converter is sinusoidal half-wave voltage, it is also possible to part reduces the loss of switching tube.But, also the shortcoming exposing prior art, the shortcoming of high-frequency inverter of the prior art is that rear class inverter is after the sinusoidal half-wave voltage receiving the output of prime DC to DC converter, when sinusoidal half-wave voltage is synthesized power frequency output voltage, the intermodulation distortion at zero passage can be caused, particularly when the resistance of output loading is relatively low, the intermodulation distortion at zero passage becomes apparent from.
Summary of the invention
When present invention aim to address the sinusoidal half-wave voltage synthesis power frequency output voltage that inverter in prior art will receive, the problem causing intermodulation distortion at zero passage, it is provided that a kind of inverse method and device.
In first aspect, the invention provides a kind of inverter, described device includes:
Power inverter, for exporting the first running voltage or the second running voltage, described first running voltage includes the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage includes the power frequency sinusoidal voltage of superposition the second DC voltage, described first DC voltage specifically includes the DC voltage after described power inverter carries out Voltage Cortrol, and described second DC voltage specifically includes and carries out the DC voltage after Voltage Cortrol without described power inverter；
Inverter, is used for receiving described first running voltage or described second running voltage, processes described first running voltage or described second running voltage, and described first running voltage or described second running voltage after processing provide to output loading.
In the first mode in the cards of the described inverter provided in described first aspect, described inverter specifically for:
When receiving described first running voltage, described inverter is operated in high frequency sinusoidal pulsewidth modulation state, the first DC voltage in described first running voltage carrying out low-pass filtering treatment, exports the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to output loading；
When receiving described second running voltage, described inverter is operated in power frequency state, and the second DC voltage in described second running voltage carries out low-pass filtering treatment, exports the 4th running voltage, and described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
In the second mode in the cards of the described inverter provided in described first aspect, described first running voltage of described power inverter output includes the power frequency sinusoidal voltage of superposition DC offset voltage, and described second running voltage includes power frequency sinusoidal voltage.
In the third mode in the cards of the described inverter provided in described first aspect, described inverter specifically for:
When receiving described first running voltage, described inverter is operated in three-phase high frequency sinusoidal pulsewidth modulation state, and described first running voltage carries out low-pass filtering treatment, exports the 3rd running voltage, and described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to three-phase output loading；
When receiving described second running voltage, described inverter is operated in three-phase main-frequency state, provides described second running voltage to three-phase output loading.
In second aspect, the invention provides a kind of inverse method, described method includes:
Export the first running voltage or the second running voltage, described first running voltage includes the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage includes the power frequency sinusoidal voltage of superposition the second DC voltage, described first DC voltage specifically includes the DC voltage after carrying out Voltage Cortrol, described second DC voltage specifically include without Voltage Cortrol after DC voltage；
Receiving described first running voltage or described second running voltage, process described first running voltage or described second running voltage, described first running voltage or described second running voltage after processing provide to output loading.
In the first mode in the cards of the described inverse method provided in described second aspect, described first running voltage of described reception or described second running voltage, being filtered described first running voltage or described second running voltage processing, described first running voltage or described second running voltage offer after processing specifically include to output loading:
When receiving described first running voltage, the first DC voltage in described first running voltage carrying out low-pass filtering treatment, export the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to output loading；
When receiving described second running voltage, the second DC voltage in described second running voltage carrying out low-pass filtering treatment, export the 4th running voltage, described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
In the second mode in the cards of the described inverse method provided in described second aspect, described first running voltage includes that the power frequency sinusoidal voltage of superposition DC offset voltage, described second running voltage include power frequency sinusoidal voltage.
In the third mode in the cards of the described inverse method provided in described second aspect, described first running voltage of described reception or described second running voltage, being filtered described first running voltage or described second running voltage processing, described first running voltage or described second running voltage offer after processing specifically include to output loading:
When receiving described first running voltage, described first running voltage carrying out low-pass filtering treatment, export the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to three-phase output loading；
When receiving described second running voltage, described second running voltage is provided to three-phase output loading.
The inverse method provided by the application embodiment of the present invention and device, power inverter exports the first running voltage or the second running voltage, first running voltage carries different voltage from the second running voltage, inverter adjusts according to the first running voltage received or the second running voltage and self is operated in high frequency sinusoidal pulsewidth modulation state or power frequency state, after first running voltage or the second running voltage are processed, there is provided to output loading, owing to the running voltage amplitude of power inverter output is relatively low, the amplitude of running voltage at zero passage near, avoid inverter when the running voltage synthesis power frequency output voltage that will receive, the problem causing intermodulation distortion at zero passage, simultaneously, the voltage stress of the power switch pipe in inverter is relatively low, reduce the conduction loss of power tube, the bus capacitor of inverter can also be reduced.
Accompanying drawing explanation
The inverter figure that Fig. 1 provides for the embodiment of the present invention；
The schematic diagram that the DC to DC converter that Fig. 2 provides for the embodiment of the present invention is connected with single-phase inverter；
Output waveform design sketch when Fig. 3 is connected with single-phase inverter for the power inverter that the embodiment of the present invention provides；
The schematic diagram that a kind of DC to DC converter that Fig. 4-A provides for the embodiment of the present invention is connected with three-phase inverter；
The schematic diagram that the another kind of DC to DC converter that Fig. 4-B provides for the embodiment of the present invention is connected with three-phase inverter；
First running voltage of output when Fig. 5-A is connected with three-phase inverter for the power inverter that the embodiment of the present invention provides；
The running voltage curve chart of the inverter output that Fig. 5-B provides for the embodiment of the present invention；
Second running voltage of output when Fig. 6-A is connected with three-phase inverter for the power inverter that the embodiment of the present invention provides；
The running voltage curve chart of the inverter output that Fig. 6-B provides for the embodiment of the present invention；
The schematic diagram that the ac/dc commutator that Fig. 7 provides for the embodiment of the present invention is connected with single-phase inverter；
The schematic diagram that a kind of ac/dc commutator that Fig. 8-A provides for the embodiment of the present invention is connected with three-phase inverter；
The schematic diagram that the another kind of ac/dc commutator that Fig. 8-B provides for the embodiment of the present invention is connected with three-phase inverter；
The inverse method flow chart that Fig. 9 provides for the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings the specific embodiment of the invention is described in further detail.
The inverter that the embodiment of the present invention provides, the inverter figure that Fig. 1 provides for the embodiment of the present invention is described below in detail as a example by Fig. 1.
As it is shown in figure 1, described inverter includes: power inverter 110 and inverter 120, power inverter is connected by positive bus-bar (+bus) and negative busbar (-bus) with inverter；
In described device, power inverter 110 can be connected by positive bus-bar (+bus) and negative busbar (-bus) with single-phase or three-phase inverter.
Power inverter 110, for output the first running voltage or the second running voltage, described first running voltage includes that the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage include the power frequency sinusoidal voltage of superposition the second DC voltage；
Described first DC voltage of described power inverter 110 output specifically includes the DC voltage after described power inverter carries out Voltage Cortrol；
Described second DC voltage specifically includes and carries out the DC voltage after Voltage Cortrol without described power inverter.
Inverter 120, for receiving described first running voltage or described second running voltage, processing described first running voltage or described second running voltage, described first running voltage or described second running voltage after processing provide to output loading.
Described inverter 120 specifically for: when receive described first running voltage time, described inverter is operated in high frequency sinusoidal pulsewidth modulation state, the first DC voltage in described first running voltage is carried out low-pass filtering treatment, exporting the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to output loading；
When receiving described second running voltage, described inverter is operated in power frequency state, and the second DC voltage in described second running voltage carries out low-pass filtering treatment, exports the 4th running voltage, and described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
In embodiments of the present invention, described power inverter can be DC-DC (DC/DC) changer or ac/dc (AC/DC) commutator, but it is not restricted to this, with DC to DC converter or ac/dc commutator, the inverter of the present invention is illustrated separately below.
The inverter provided by the application embodiment of the present invention, power inverter exports the first running voltage or the second running voltage, first running voltage carries different voltage from the second running voltage, inverter adjusts according to the first running voltage received or the second running voltage and self is operated in high frequency sinusoidal pulsewidth modulation state or power frequency state, after first running voltage or the second running voltage are processed, there is provided to output loading, owing to the running voltage amplitude of power inverter output is relatively low, the amplitude of running voltage at zero passage near, avoid inverter when the running voltage synthesis power frequency output voltage that will receive, the problem causing intermodulation distortion at zero passage, simultaneously, the voltage stress of the power switch pipe in inverter is relatively low, reduce the conduction loss of power tube, the bus capacitor of inverter can also be reduced.
For making the object, technical solutions and advantages of the present invention clearer, being described in further detail the specific embodiment of the invention below in conjunction with the accompanying drawings, in embodiments of the present invention, power inverter is DC-DC (DC/DC) changer.
When inverter is single-phase inverter, DC to DC converter 210 is connected as shown in Figure 2 by positive bus-bar (+bus) and negative busbar (-bus) with inverter 220.
When described middle DC to DC converter 210 is connected with inverter 210, for exporting the first running voltage or the second running voltage, described first running voltage includes that the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage include the power frequency sinusoidal voltage of superposition the second DC voltage；
Described first DC voltage of described DC to DC converter 210 output specifically includes the DC voltage after described DC to DC converter carries out Voltage Cortrol；
Described second DC voltage specifically includes and carries out the DC voltage after Voltage Cortrol without described DC to DC converter.
Inverter 220, for receiving described first running voltage or described second running voltage, processing described first running voltage or described second running voltage, described first running voltage or described second running voltage after processing provide to output loading.
It should be noted that, in embodiments of the present invention, voltage is adjusted specifically including by described DC to DC converter 210, the input voltage of self is compensated by DC to DC converter 210, input voltage after compensating is as the first DC voltage, such as, the input voltage of DC to DC converter 210 is 100V, and 100V rises a height of 200V；Voltage is not adjusted specifically including by described DC to DC converter 210, DC to DC converter 210 by the input voltage of self directly as the second DC voltage.
Wherein, described inverter 220 is used for receiving described first running voltage or described second running voltage, processing described first running voltage or described second running voltage, described first running voltage or described second running voltage offer after processing specifically include to output loading:
When receiving described first running voltage, described inverter 220 is operated in high frequency sinusoidal pulsewidth modulation state, the first DC voltage in described first running voltage carrying out low-pass filtering treatment, exports the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to output loading；
Or, when receiving described second running voltage, described inverter 220 is operated in power frequency state, and the second DC voltage in described second running voltage carries out low-pass filtering treatment, exports the 4th running voltage, and described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
Further, DC to DC converter 210 exports two different form of voltage.The first form is: DC to DC converter 210 output includes the power frequency sine wave voltage of superposition the first DC voltage；First DC voltage exports to bus after being carried out Voltage Cortrol by DC to DC converter 210；Power frequency sine wave voltage is also exported to bus by DC to DC converter 210.When busbar voltage is the first DC voltage, inverter 220 carries out high frequency power transmission.When busbar voltage is power frequency sine wave voltage, inverter 220 carries out power frequency power transmission.Now, inverter is made without HF switch, only direct mode operation.Therefore, loss can reduce further.Zero crossing distortion, the problem such as voltage distortion, it is also possible to significantly improved.
The second form is: DC to DC converter 210 output includes the power frequency sine wave voltage of superposition the second DC voltage；Second DC voltage is directly provided by the input side voltage of DC to DC converter 210；Second DC voltage is directly output on bus by DC to DC converter 210, and now, DC to DC converter 210 is in pass-through state, and DC to DC converter 210 does not has switching loss；Power frequency sine wave voltage is also exported to bus by DC to DC converter 210.When busbar voltage is the second DC voltage, inverter 220 carries out high frequency power transmission.When busbar voltage is power frequency sine wave voltage, inverter 220 carries out power frequency power transmission, and now, inverter 220 is made without HF switch, only direct mode operation.Therefore, loss can reduce further.Meanwhile, zero crossing distortion, the problem such as voltage distortion, it is also possible to significantly improved.
Output waveform design sketch when power inverter as shown in Figure 3 is connected with single-phase inverter, at any time, the one-level in DC to DC converter 210 or inverter 220 is at pass-through state.Therefore, whole system work efficiency can be greatly improved.
Owing to first, second running voltage amplitude of DC to DC converter 210 output is relatively low, the amplitude of first, second running voltage at zero passage near, avoid inverter 220 when the first, second running voltage filtering output that will receive, the problem causing intermodulation distortion at zero passage, the voltage stress of the power switch pipe in inverter 220 is relatively low, reduce the conduction loss of power tube, meanwhile, can also reduce the bus capacitor of inverter.
In another preferred embodiment, as shown in Fig. 4-A or Fig. 4-B, when inverter is three-phase inverter, Fig. 4-A is that DC to DC converter 410 is connected by three-phase bus with inverter 420, Fig. 4-B is that DC to DC converter 410 is connected by single-phase bus with inverter 420, three-phase system shares single-phase bus, and the operation principle of above two connected mode is identical.
When described DC to DC converter 410 is connected with inverter 420, described first running voltage of described DC to DC converter 410 output includes the power frequency sinusoidal voltage of superposition DC offset voltage, and described second running voltage is power frequency sinusoidal voltage；
Described inverter 420, for receiving described first running voltage or described second running voltage, being filtered described first running voltage or described second running voltage processing, described first running voltage or described second running voltage offer after processing specifically include to output loading:
When receiving described first running voltage, described inverter 420 is operated in three-phase high frequency sinusoidal pulsewidth modulation state, and described first running voltage carries out low-pass filtering treatment, exports the 3rd running voltage, and described 3rd running voltage is power frequency sinusoidal voltage；Thering is provided described 3rd running voltage to three-phase output loading, the first running voltage of output when power inverter as shown in fig. 5-A is connected with three-phase inverter, described first running voltage is power frequency sinusoidal voltage superposition DC offset voltage；3rd running voltage curve chart of inverter output as shown in fig. 5-b, the 3rd running voltage is three-phase voltage；
Or, when receiving described second running voltage, described inverter 420 is operated in three-phase main-frequency state, described second running voltage is provided to three-phase output loading, second running voltage of output when power inverter as shown in Fig. 6-A is connected with three-phase inverter, described second running voltage is power frequency sinusoidal voltage, and the second running voltage curve chart of inverter output as shown in figure 6-b, this second running voltage is three-phase voltage.
Owing to first, second running voltage amplitude of DC to DC converter 410 output is relatively low, the amplitude of first, second running voltage at zero passage near, avoid inverter 420 when the first, second running voltage filtering output that will receive, the problem causing intermodulation distortion at zero passage, simultaneously, inverter 420 can be successively to A, and B, C three-phase alternating current exports.Such that it is able to improve A, B, C three-phase inverter power transmits；Make each phase all similar with single-phase bus, this improves A, the power transmission of B, C three-phase inverter and power transmission efficiency；The voltage stress of the power switch pipe in inverter is relatively low, reduces the conduction loss of power tube.
nullThe inverter provided by the application embodiment of the present invention，DC to DC converter exports the first running voltage or the second running voltage，First running voltage carries different voltage from the second running voltage，Inverter adjusts according to the first running voltage received or the second running voltage and self is operated in high frequency sinusoidal pulsewidth modulation state or power frequency state，After first running voltage or the second running voltage are processed，There is provided to output loading，Owing to the running voltage amplitude of DC to DC converter output is relatively low，The amplitude of running voltage at zero passage near，Avoid inverter when the running voltage synthesis power frequency output voltage that will receive，The problem causing intermodulation distortion at zero passage，Simultaneously，The voltage stress of the power switch pipe in inverter is relatively low，Reduce the conduction loss of power tube，The bus capacitor of inverter can also be reduced.
For making the object, technical solutions and advantages of the present invention clearer, being described in further detail the specific embodiment of the invention below in conjunction with the accompanying drawings, in embodiments of the present invention, power inverter is ac/dc (AC/DC) commutator.
Power inverter in the embodiment of the present invention can also be used with ac/dc (AC/DC) commutator and substitutes.Commutator can be Active control device, such as IGBT, rectification, it is also possible to be not control device, such as diode.When inverter is single-phase inverter, the schematic diagram of the connection of ac/dc commutator and inverter is as it is shown in fig. 7, ac/dc commutator 710 is connected by positive bus-bar (+bus) and negative busbar (-bus) with inverter 720.
When described middle ac/dc commutator 710 is connected with inverter 720, for exporting the first running voltage or the second running voltage, described first running voltage includes that the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage include the power frequency sinusoidal voltage of superposition the second DC voltage；
Described first DC voltage of described ac/dc commutator 710 output specifically includes the DC voltage after described ac/dc commutator carries out Voltage Cortrol；
Described second DC voltage specifically includes and carries out the DC voltage after Voltage Cortrol without described ac/dc commutator.
Inverter 720, for receiving described first running voltage or described second running voltage, processing described first running voltage or described second running voltage, described first running voltage or described second running voltage after processing provide to output loading.
It should be noted that, in embodiments of the present invention, voltage is adjusted specifically including by described ac/dc commutator 710, the input voltage of self is compensated by ac/dc commutator 710, input voltage after compensating is as the first DC voltage, such as, the input voltage of ac/dc commutator 710 is 100V, and 100V rises a height of 200V；Described ac/dc commutator 710 voltage is not adjusted specifically, ac/dc commutator 710 by the input voltage of self directly as the second DC voltage.
Wherein, described inverter 720 is used for receiving described first running voltage or described second running voltage, processing described first running voltage or described second running voltage, described first running voltage or described second running voltage offer after processing specifically include to output loading:
When receiving described first running voltage, described inverter 720 is operated in high frequency sinusoidal pulsewidth modulation state, the first DC voltage in described first running voltage carrying out low-pass filtering treatment, exports the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to output loading；
Or, when receiving described second running voltage, described inverter 720 is operated in power frequency state, and the second DC voltage in described second running voltage carries out low-pass filtering treatment, exports the 4th running voltage, and described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
Further, ac/dc commutator 710 exports two different form of voltage.The first form is: ac/dc commutator 710 output includes the power frequency sine wave voltage of superposition the first DC voltage；First DC voltage exports to bus after being carried out Voltage Cortrol by ac/dc commutator 710；Power frequency sine wave voltage is also exported to bus by ac/dc commutator 710.When busbar voltage is the first DC voltage, inverter 720 carries out high frequency power transmission.When busbar voltage is power frequency sine wave voltage, inverter 720 carries out power frequency power transmission.Now, inverter 720 is made without HF switch, only direct mode operation.Therefore, loss can reduce further.Meanwhile, zero crossing distortion, the problem such as voltage distortion, it is also possible to significantly improved.
The second form is: ac/dc commutator 710 output includes the power frequency sine wave voltage of superposition the second DC voltage；Second DC voltage is directly provided by the input side voltage of ac/dc commutator 710；Second DC voltage is directly output on bus by ac/dc commutator 710, and now, ac/dc commutator 710 is in pass-through state, and ac/dc commutator 710 does not has switching loss；Power frequency sine wave voltage is also exported to bus by ac/dc commutator 710.When busbar voltage is the second DC voltage, inverter 720 carries out high frequency power transmission.When busbar voltage is power frequency sine wave voltage, inverter 720 carries out power frequency power transmission, and now, inverter 720 is made without HF switch, only direct mode operation.Therefore, loss can reduce further.Meanwhile, zero crossing distortion, the problem such as voltage distortion, it is also possible to significantly improved.
Output waveform design sketch when power inverter as shown in Figure 3 is connected with single-phase inverter, at any time, the one-level in ac/dc commutator 710 or inverter 720 is at pass-through state.Therefore, whole system work efficiency can be greatly improved.
Owing to first, second running voltage amplitude of ac/dc commutator 710 output is relatively low, the amplitude of first, second running voltage at zero passage near, avoid inverter 720 when the first, second running voltage filtering output that will receive, the problem causing intermodulation distortion at zero passage, simultaneously, the voltage stress of the power switch pipe in inverter 720 is relatively low, reduces the conduction loss of power tube.
In another preferred embodiment, as shown in Fig. 8-A or Fig. 8-B, when inverter is three-phase inverter, Fig. 8-A is that AC-dc converter 810 is connected by three-phase bus with inverter 820, Fig. 8-B is that AC-dc converter 810 is connected by single-phase bus with inverter 820, three-phase system shares single-phase bus, and the operation principle of above two connected mode is identical.
When described AC-dc converter 810 is connected with inverter 820, described first running voltage of described AC-dc converter 810 output includes: also, described second running voltage is power frequency sinusoidal voltage to the power frequency sinusoidal voltage of superposition DC offset voltage；
Described inverter 820, for receiving described first running voltage or described second running voltage, being filtered described first running voltage or described second running voltage processing, described first running voltage or described second running voltage offer after processing specifically include to output loading:
When receiving described first running voltage, described inverter 820 is operated in three-phase high frequency sinusoidal pulsewidth modulation state, and described first running voltage carries out low-pass filtering treatment, exports the 3rd running voltage, and described 3rd running voltage is power frequency sinusoidal voltage；Thering is provided described 3rd running voltage to three-phase output loading, the first running voltage of output when power inverter as shown in fig. 5-A is connected with three-phase inverter, described first running voltage is power frequency sinusoidal voltage superposition DC offset voltage；3rd running voltage curve chart of inverter output as shown in fig. 5-b, the 3rd running voltage is three-phase voltage；
Or, when receiving described second running voltage, described inverter 820 is operated in three-phase main-frequency state, described second running voltage is provided to three-phase output loading, second running voltage of output when power inverter as shown in Fig. 6-A is connected with three-phase inverter, described second running voltage is power frequency sinusoidal voltage, and the second running voltage curve chart of inverter output as shown in figure 6-b, this second running voltage is three-phase voltage.
Owing to first, second running voltage amplitude of AC-dc converter 810 output is relatively low, the amplitude of first, second running voltage at zero passage near, avoid inverter 820 when the first, second running voltage filtering output that will receive, the problem causing intermodulation distortion at zero passage, simultaneously, inverter 820 can be successively to A, and B, C three-phase alternating current exports.Such that it is able to improve A, B, C three-phase inverter power transmits；Make each phase all similar with single-phase bus, this improves A, the power transmission of B, C three-phase inverter and power transmission efficiency；The voltage stress of the power switch pipe in inverter is relatively low, reduces the conduction loss of power tube.
nullThe inverter provided by the application embodiment of the present invention，Ac/dc commutator exports the first running voltage or the second running voltage，First running voltage carries different voltage from the second running voltage，Inverter adjusts according to the first running voltage received or the second running voltage and self is operated in high frequency sinusoidal pulsewidth modulation state or power frequency state，After first running voltage or the second running voltage are processed，There is provided to output loading，Owing to the running voltage amplitude of ac/dc commutator output is relatively low，The amplitude of running voltage at zero passage near，Avoid inverter when the running voltage synthesis power frequency output voltage that will receive，The problem causing intermodulation distortion at zero passage，Simultaneously，The voltage stress of the power switch pipe in inverter is relatively low，Reduce the conduction loss of power tube，The bus capacitor of inverter can also be reduced.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings the specific embodiment of the invention is described in further detail.
The inverse method flow chart that the embodiment of the present invention provides, the inverse method flow chart that Fig. 9 provides for the embodiment of the present invention is described below in detail as a example by Fig. 9.As it is shown in figure 9, implement inverse method to need following steps:
Step 910, export the first running voltage or the second running voltage, described first running voltage includes the power frequency sinusoidal voltage of superposition the first DC voltage, described second running voltage includes the power frequency sinusoidal voltage of superposition the second DC voltage, described first DC voltage specifically includes the DC voltage after carrying out Voltage Cortrol, described second DC voltage specifically include without Voltage Cortrol after DC voltage；
Specifically, in one example, exporting the first running voltage, the first running voltage includes that the power frequency sinusoidal voltage of superposition the first DC voltage, described first DC voltage specifically include the DC voltage after carrying out Voltage Cortrol；
In another example, exporting the second running voltage, the second running voltage includes the power frequency sinusoidal voltage of superposition the second DC voltage, and described second DC voltage is specially the DC voltage after not carrying out Voltage Cortrol.
Need explanation, in embodiments of the present invention, described in carry out Voltage Cortrol for voltage to be compensated.
Step 920, receiving described first running voltage or described second running voltage, process described first running voltage or described second running voltage, described first running voltage or described second running voltage after processing provide to output loading.
Specifically, when receiving described first running voltage, the first DC voltage in described first running voltage carrying out low-pass filtering treatment, export the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to output loading；
Or, when receiving described second running voltage, the second DC voltage in described second running voltage being carried out low-pass filtering treatment, export the 4th running voltage, described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
Alternatively, described first running voltage includes the power frequency sinusoidal voltage of superposition DC offset voltage also, and described second running voltage can be also power frequency sinusoidal voltage.
Further, when receiving the first running voltage, when described first running voltage includes the power frequency sinusoidal voltage of superposition DC offset voltage, described first running voltage is carried out low-pass filtering treatment, exporting the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided to three-phase output loading；
When receiving described second running voltage, when described second running voltage is power frequency sinusoidal voltage, described second running voltage is provided to three-phase output loading.
The inverse method provided by the application embodiment of the present invention, export the first running voltage or the second running voltage, first running voltage carries different voltage from the second running voltage, adjust according to the first running voltage received or the second running voltage and self be operated in high frequency sinusoidal pulsewidth modulation state or power frequency state, after first running voltage or the second running voltage are processed, there is provided to output loading, owing to the running voltage amplitude of DC to DC converter output is relatively low, the amplitude of running voltage at zero passage near, avoid when the running voltage synthesis power frequency output voltage that will receive, the problem causing intermodulation distortion at zero passage.
Professional should further appreciate that, the unit of each example described in conjunction with the embodiments described herein and algorithm steps, can be with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate the interchangeability of hardware and software, the most generally describe composition and the step of each example according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use different methods to realize described function to each specifically should being used for, but this realization is it is not considered that beyond the scope of this invention.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (4)
1. an inverter, it is characterised in that described device includes:
Power inverter, for output the first running voltage or the second running voltage, described first running voltage
The power frequency sinusoidal voltage of the first DC voltage including superposition, described second running voltage includes superposition
The power frequency sinusoidal voltage of two DC voltages, described first DC voltage specifically includes through described power inverter
Carrying out the DC voltage after Voltage Cortrol, described second DC voltage specifically includes without described power conversion
Device carries out the DC voltage after Voltage Cortrol；
Single-phase inverter, is used for, and when receiving described first running voltage, described single-phase inverter is operated in
High frequency sinusoidal pulsewidth modulation state, carries out low pass filtered to the first DC voltage in described first running voltage
Ripple processes, and exports the 3rd running voltage, and described 3rd running voltage is power frequency sinusoidal voltage；By described
Three running voltages provide to output loading；
When receiving described second running voltage, described single-phase inverter is operated in power frequency state, to described the
The second DC voltage in two running voltages carries out low-pass filtering treatment, exports the 4th running voltage, described
4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided to output loading.
2. an inverter, it is characterised in that described device includes:
Power inverter, for output the first running voltage or the second running voltage, described first running voltage
The power frequency sinusoidal voltage of DC offset voltage including superposition, described second running voltage includes that power frequency is sinusoidal
Voltage；
Three-phase inverter, for when receiving described first running voltage, described three-phase inverter is operated in three
Phase high frequency sinusoidal pulsewidth modulation state, carries out low-pass filtering treatment to described first running voltage, output the
Three running voltages, described 3rd running voltage is power frequency sinusoidal voltage；Described 3rd running voltage is provided
To three-phase output loading；
When receiving described second running voltage, described three-phase inverter is operated in three-phase main-frequency state, by institute
State the second running voltage to provide to three-phase output loading.
3. an inverse method, it is characterised in that described method includes:
Power inverter exports the first running voltage or the second running voltage, and described first running voltage includes folding
Having added the power frequency sinusoidal voltage of the first DC voltage, described second running voltage includes superposition the second direct current
The power frequency sinusoidal voltage of voltage, described first DC voltage specifically includes the unidirectional current after carrying out Voltage Cortrol
Pressure, described second DC voltage specifically include without Voltage Cortrol after DC voltage；
When single-phase inverter receives described first running voltage, described single-phase inverter is operated in high frequency sinusoidal
Pulsewidth modulation state, carries out low-pass filtering treatment to the first DC voltage in described first running voltage,
Exporting the 3rd running voltage, described 3rd running voltage is power frequency sinusoidal voltage；By described 3rd work electricity
Pressure provides to output loading；
When described single-phase inverter receives described second running voltage, described single-phase inverter is operated in power frequency
State, carries out low-pass filtering treatment to the second DC voltage in described second running voltage, exports the 4th
Running voltage, described 4th running voltage is power frequency sinusoidal voltage；Described 4th running voltage is provided extremely
Output loading.
4. an inverse method, it is characterised in that described method includes:
Power inverter exports the first running voltage or the second running voltage, and described first running voltage includes folding
Having added the power frequency sinusoidal voltage of DC offset voltage, described second running voltage includes power frequency sinusoidal voltage；
When three-phase inverter receives described first running voltage, described three-phase inverter is operated in three-phase high frequency
Sinusoidal pulse width modulation state, carries out low-pass filtering treatment, output the 3rd work electricity to described first running voltage
Pressure, described 3rd running voltage is power frequency sinusoidal voltage；There is provided defeated to three-phase by described 3rd running voltage
Go out load；
When described three-phase inverter receives described second running voltage, described three-phase inverter is operated in three-phase
Power frequency state, provides described second running voltage to three-phase output loading.
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| CN201210393882.3A CN102868312B (en) | 2012-10-17 | 2012-10-17 | Inverse method and device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594068A (en) * | 2008-05-27 | 2009-12-02 | 通用电气公司 | Efficiently, multi-source photovoltaic inverter |
| CN101610038A (en) * | 2009-07-13 | 2009-12-23 | 南京航空航天大学 | The photovoltaic combining inverter of Boost and Buck cascade and control method thereof |
| CN202444440U (en) * | 2012-02-27 | 2012-09-19 | 无锡联动太阳能科技有限公司 | Bridgeless inverter circuit and solar bridgeless inverter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594068A (en) * | 2008-05-27 | 2009-12-02 | 通用电气公司 | Efficiently, multi-source photovoltaic inverter |
| CN101610038A (en) * | 2009-07-13 | 2009-12-23 | 南京航空航天大学 | The photovoltaic combining inverter of Boost and Buck cascade and control method thereof |
| CN202444440U (en) * | 2012-02-27 | 2012-09-19 | 无锡联动太阳能科技有限公司 | Bridgeless inverter circuit and solar bridgeless inverter |
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