CN102868312A - Contravariant method and contravariant device - Google Patents
Contravariant method and contravariant device Download PDFInfo
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- CN102868312A CN102868312A CN2012103938823A CN201210393882A CN102868312A CN 102868312 A CN102868312 A CN 102868312A CN 2012103938823 A CN2012103938823 A CN 2012103938823A CN 201210393882 A CN201210393882 A CN 201210393882A CN 102868312 A CN102868312 A CN 102868312A
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Abstract
An embodiment of the invention relates to a contravariant method and a contravariant device. The device comprises a power converter and an inverter, the power converter is used for outputting first working voltage and second working voltage, the first working voltage comprises power frequency sinusoidal voltage overlapped with first direct current voltage, the second working voltage comprises power frequency sinusoidal voltage overlapped with second direct current voltage, the first direct current voltage particularly comprises direct current voltage carried out by the power converter after voltage regulation, the second direct current voltage comprises direct current voltage carried out by the power converter after voltage regulation, and the inverter is used for receiving the first working voltage or the second working voltage, processing the first working voltage or the second working voltage and providing the processed the first working voltage or the second working voltage to output load.
Description
Technical field
The present invention relates to field of power supplies, relate in particular to a kind of inverse method and device.
Background technology
At present, new energy resources system, communication system requires growingly to supply unit, and supply unit should satisfy the standard of high efficiency, high power density, high reliability as the key component of power conversion in new forms of energy or the communication system.
Supply unit in new energy resources system or communication system adopts the high-frequency chain inverter power supply, the circuit framework of high-frequency chain inverter comprises, prime DC to DC converter (DC/DC) and rear class inverter, wherein, the rear class inverter generally is divided into single-phase, and three-phase inverter.
In the prior art, the output voltage of DC to DC converter is a half-sinusoid voltage (can think a kind of form of direct voltage); The rear class inverter is operated in the power frequency state identical with mains frequency.
In the high-frequency chain inverter of the prior art, because the rear class inverter works in the power frequency state, can reduce the switching loss of power switch pipe and filter inductance in the rear class inverter, the output voltage of prime DC to DC converter is half-sinusoid voltage, also can partly reduce the loss of switching tube.But, also expose the shortcoming of prior art, the shortcoming of high-frequency inverter of the prior art is that the rear class inverter is behind the half-sinusoid voltage that receives the output of prime DC to DC converter, during with the synthetic power frequency output voltage of half-sinusoid voltage, can cause the intermodulation distortion at zero passage place, particularly when the resistance of output loading was hanged down, the intermodulation distortion at zero passage place was more obvious.
Summary of the invention
The objective of the invention is to solve when inverter synthesizes the power frequency output voltage with the half-sinusoid voltage that receives in the prior art, cause the problem of the intermodulation distortion at zero passage place, a kind of inverse method and device are provided.
In first aspect, the invention provides a kind of inverter, described device comprises:
Power inverter, be used for output the first operating voltage or the second operating voltage, described the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, described the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed, described the first direct voltage specifically comprises through described power inverter and carries out direct voltage after voltage is adjusted, and described the second direct voltage specifically comprises without described power inverter and carries out direct voltage after voltage is adjusted;
Inverter, be used for receiving described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are processed, described the first operating voltage or described the second operating voltage after processing are provided to output loading.
In the first of the described inverter that described first aspect provides mode in the cards, described inverter specifically is used for:
When receiving described the first operating voltage, described inverter is operated in high frequency sinusoidal pulse width modulation state, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
When receiving described the second operating voltage, described inverter is operated in the power frequency state, and the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, exports the 4th operating voltage, and described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
In the second of the described inverter that described first aspect provides mode in the cards, described first operating voltage of described power inverter output comprises the power frequency sinusoidal voltage of the dc offset voltage that superposeed, and described the second operating voltage comprises the power frequency sinusoidal voltage.
In the third mode in the cards of the described inverter that described first aspect provides, described inverter specifically is used for:
When receiving described the first operating voltage, described inverter is operated in three-phase high frequency sinusoidal pulse width modulation state, and described the first operating voltage is carried out low-pass filtering treatment, exports the 3rd operating voltage, and described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading;
When receiving described the second operating voltage, described inverter is operated in the three-phase main-frequency state, and described the second operating voltage is provided to the three-phase output loading.
In second aspect, the invention provides a kind of inverse method, described method comprises:
Export the first operating voltage or the second operating voltage, described the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, described the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed, described the first direct voltage specifically comprises the direct voltage that carries out after voltage is adjusted, and described the second direct voltage specifically comprises without the direct voltage after the voltage adjustment;
Receive described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are processed, described the first operating voltage or described the second operating voltage after processing are provided to output loading.
In the first of the described inverse method that described second aspect provides mode in the cards, described the first operating voltage of described reception or described the second operating voltage, described the first operating voltage or described the second operating voltage are carried out filtering process, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
When receiving described the second operating voltage, the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, export the 4th operating voltage, described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
In the second of the described inverse method that described second aspect provides mode in the cards, described the first operating voltage comprises the power frequency sinusoidal voltage of the dc offset voltage that superposeed, and described the second operating voltage comprises the power frequency sinusoidal voltage.
In the third mode in the cards of the described inverse method that described second aspect provides, described the first operating voltage of described reception or described the second operating voltage, described the first operating voltage or described the second operating voltage are carried out filtering process, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading;
When receiving described the second operating voltage, described the second operating voltage is provided to the three-phase output loading.
The inverse method and the device that provide by using the embodiment of the invention, power inverter is exported the first operating voltage or the second operating voltage, the first operating voltage is carried different voltages from the second operating voltage, inverter self is operated in high frequency sinusoidal pulse width modulation state or power frequency state according to the first operating voltage or the second operating voltage adjustment that receive, after the first operating voltage or the second operating voltage processed, provide to output loading, because the operating voltage amplitude of power inverter output is lower, the amplitude of operating voltage is near the zero passage place, avoided inverter when the synthetic power frequency output voltage of the operating voltage that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, the voltage stress of the power switch pipe in the inverter is lower, reduces the conduction loss of power tube, also can reduce the bus capacitor of inverter.
Description of drawings
The inverter figure that Fig. 1 provides for the embodiment of the invention;
The schematic diagram that the DC to DC converter that Fig. 2 provides for the embodiment of the invention is connected with single-phase inverter;
Output waveform design sketch when the power inverter that Fig. 3 provides for the embodiment of the invention is connected with single-phase inverter;
The schematic diagram that a kind of DC to DC converter that Fig. 4-A provides for the embodiment of the 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 invention is connected with three-phase inverter;
The first operating voltage of output when the power inverter that Fig. 5-A provides for the embodiment of the invention is connected with three-phase inverter;
The operating voltage curve chart that Fig. 5-B exports for the inverter that the embodiment of the invention provides;
The second operating voltage of output when the power inverter that Fig. 6-A provides for the embodiment of the invention is connected with three-phase inverter;
The operating voltage curve chart that Fig. 6-B exports for the inverter that the embodiment of the invention provides;
The schematic diagram that the ac/dc rectifier that Fig. 7 provides for the embodiment of the invention is connected with single-phase inverter;
The schematic diagram that a kind of ac/dc rectifier that Fig. 8-A provides for the embodiment of the invention is connected with three-phase inverter;
The schematic diagram that the another kind of ac/dc rectifier that Fig. 8-B provides for the embodiment of the invention is connected with three-phase inverter;
The inverse method flow chart that Fig. 9 provides for the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the specific embodiment of the invention is described in further detail.
The below describes the inverter that the embodiment of the invention provides, the inverter figure that Fig. 1 provides for the embodiment of the invention in detail as an example of Fig. 1 example.
As shown in Figure 1, described inverter comprises: power inverter 110 and inverter 120, power inverter and inverter by positive bus-bar (+bus) be connected with negative busbar-bus) be connected;
In the described device power inverter 110 can with single-phase or three-phase inverter by positive bus-bar (+bus) be connected with negative busbar-bus) be connected.
Described first direct voltage of described power inverter 110 outputs specifically comprises the direct voltage after described power inverter carries out the voltage adjustment;
Described the second direct voltage specifically comprises without described power inverter and carries out direct voltage after voltage is adjusted.
Described inverter 120 specifically is used for: when receiving described the first operating voltage, described inverter is operated in high frequency sinusoidal pulse width modulation state, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
When receiving described the second operating voltage, described inverter is operated in the power frequency state, and the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, exports the 4th operating voltage, and described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
In embodiments of the present invention, described power inverter can be DC-DC (DC/DC) converter or ac/dc (AC/DC) rectifier, but be not restricted to this, the below describes inverter of the present invention with DC to DC converter or ac/dc rectifier respectively.
The inverter that provides by using the embodiment of the invention, power inverter is exported the first operating voltage or the second operating voltage, the first operating voltage is carried different voltages from the second operating voltage, inverter self is operated in high frequency sinusoidal pulse width modulation state or power frequency state according to the first operating voltage or the second operating voltage adjustment that receive, after the first operating voltage or the second operating voltage processed, provide to output loading, because the operating voltage amplitude of power inverter output is lower, the amplitude of operating voltage is near the zero passage place, avoided inverter when the synthetic power frequency output voltage of the operating voltage that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, the voltage stress of the power switch pipe in the inverter is lower, reduces the conduction loss of power tube, also can reduce the bus capacitor of inverter.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the specific embodiment of the invention is described in further detail, in embodiments of the present invention, power inverter is DC-DC (DC/DC) converter.
When inverter is single-phase inverter, DC to DC converter 210 and inverter 220 by positive bus-bar (+bus) be connected with negative busbar-bus) be connected as shown in Figure 2.
When described middle DC to DC converter 210 is connected with inverter 210, be used for output the first operating voltage or the second operating voltage, described the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, and described the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed;
Described first direct voltage of described DC to DC converter 210 outputs specifically comprises the direct voltage after described DC to DC converter carries out the voltage adjustment;
Described the second direct voltage specifically comprises without described DC to DC converter and carries out direct voltage after voltage is adjusted.
Need to prove, in embodiments of the present invention, 210 pairs of voltages of described DC to DC converter are adjusted specifically and are comprised, DC to DC converter 210 compensates the input voltage of self, with the input voltage after compensating as the first direct voltage, for example, the input voltage of DC to DC converter 210 is 100V, and 100V is raise is 200V; 210 pairs of voltages of described DC to DC converter are not adjusted specifically and are comprised, DC to DC converter 210 with self input voltage directly as the second direct voltage.
Wherein, described inverter 220 is used for receiving described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are processed, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, described inverter 220 is operated in high frequency sinusoidal pulse width modulation state, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
Perhaps, when receiving described the second operating voltage, described inverter 220 is operated in the power frequency state, and the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, exports the 4th operating voltage, and described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
Further, two kinds of multi-form voltages of DC to DC converter 210 outputs.The first form is: DC to DC converter 210 outputs comprise the power frequency sine wave voltage of first direct voltage that superposeed; The first direct voltage is undertaken exporting on the bus after the voltage adjustment by DC to DC converter 210; Power frequency sine wave voltage is also exported on the bus by DC to DC converter 210.When busbar voltage was the first direct voltage, inverter 220 carried out the high frequency power transmission.When busbar voltage was power frequency sine wave voltage, inverter 220 carried out the power frequency power delivery.At this moment, inverter does not need to carry out HF switch, only is direct mode operation.Therefore, loss can further reduce.Zero crossing distortion, the problems such as voltage distortion also can significantly be improved.
The second form is: DC to DC converter 210 outputs comprise the power frequency sine wave voltage of second direct voltage that superposeed; The second direct voltage is directly provided by the input side voltage of DC to DC converter 210; The second direct voltage is directly exported on the bus by DC to DC converter 210, and at this moment, DC to DC converter 210 is in pass-through state, and DC to DC converter 210 does not have switching loss; Power frequency sine wave voltage is also exported on the bus by DC to DC converter 210.When busbar voltage was the second direct voltage, inverter 220 carried out the high frequency power transmission.When busbar voltage was power frequency sine wave voltage, inverter 220 carried out the power frequency power delivery, and at this moment, inverter 220 does not need to carry out HF switch, only is direct mode operation.Therefore, loss can further reduce.Simultaneously, zero crossing distortion, the problems such as voltage distortion also can significantly be 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 the inverter 220 all is in pass-through state.Therefore, the whole system operating efficiency can improve greatly.
Because first, second operating voltage amplitude of DC to DC converter 210 outputs is lower, the amplitude of first, second operating voltage is near the zero passage place, avoided inverter 220 when first, second operating voltage filtering output that will receive, cause the problem of the intermodulation distortion at zero passage place, the voltage stress of the power switch pipe in the inverter 220 is lower, reduce the conduction loss of power tube, simultaneously, can also reduce the bus capacitor of inverter.
In another preferred embodiment, 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 the 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 is shared single-phase bus, and the operation principle of above-mentioned two kinds of connected modes is identical.
When described DC to DC converter 410 was connected with inverter 420, described first operating voltage of described DC to DC converter 410 outputs comprised the power frequency sinusoidal voltage of the dc offset voltage that superposeed, and described the second operating voltage is the power frequency sinusoidal voltage;
Described inverter 420, be used for receiving described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are carried out filtering process, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, described inverter 420 is operated in three-phase high frequency sinusoidal pulse width modulation state, and described the first operating voltage is carried out low-pass filtering treatment, exports the 3rd operating voltage, and described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading, the first operating voltage of output when the power inverter shown in Fig. 5-A is connected with three-phase inverter, described the first operating voltage is power frequency sinusoidal voltage and the dc offset voltage that superposes; The 3rd operating voltage curve chart of the inverter output shown in Fig. 5-B, the 3rd operating voltage is three-phase voltage;
Perhaps, when receiving described the second operating voltage, described inverter 420 is operated in the three-phase main-frequency state, described the second operating voltage is provided to the three-phase output loading, the second operating voltage of output when the power inverter shown in Fig. 6-A is connected with three-phase inverter, described the second operating voltage is the power frequency sinusoidal voltage, the second operating voltage curve chart of the inverter output shown in Fig. 6-B, and this second operating voltage is three-phase voltage.
Because first, second operating voltage amplitude of DC to DC converter 410 outputs is lower, the amplitude of first, second operating voltage is near the zero passage place, avoided inverter 420 when first, second operating voltage filtering output that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, inverter 420 can be successively to A, B, the output of C three-phase alternating current.Thereby can improve A, B, C three-phase inverter power delivery; Make each all similar with single-phase bus mutually, therefore, improved A, B, the power delivery of C three-phase inverter and power transmission efficiency; The voltage stress of the power switch pipe in the inverter is lower, reduces the conduction loss of power tube.
The inverter that provides by using the embodiment of the invention, DC to DC converter is exported the first operating voltage or the second operating voltage, the first operating voltage is carried different voltages from the second operating voltage, inverter self is operated in high frequency sinusoidal pulse width modulation state or power frequency state according to the first operating voltage or the second operating voltage adjustment that receive, after the first operating voltage or the second operating voltage processed, provide to output loading, because the operating voltage amplitude of DC to DC converter output is lower, the amplitude of operating voltage is near the zero passage place, avoided inverter when the synthetic power frequency output voltage of the operating voltage that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, the voltage stress of the power switch pipe in the inverter is lower, reduce the conduction loss of power tube, also can reduce the bus capacitor of inverter.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the specific embodiment of the invention is described in further detail, in embodiments of the present invention, power inverter is ac/dc (AC/DC) rectifier.
Power inverter in the embodiment of the invention also available ac/dc (AC/DC) rectifier substitutes.Rectifier can be active controller spare, and such as IGBT, rectification also can be not control device, such as diode.When inverter is single-phase inverter, the schematic diagram that is connected of ac/dc rectifier and inverter as shown in Figure 7, ac/dc rectifier 710 and inverter 720 by positive bus-bar (+bus) be connected with negative busbar-bus) be connected.
When described middle ac/dc rectifier 710 is connected with inverter 720, be used for output the first operating voltage or the second operating voltage, described the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, and described the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed;
Described first direct voltage of described ac/dc rectifier 710 outputs specifically comprises the direct voltage after described ac/dc rectifier carries out the voltage adjustment;
Described the second direct voltage specifically comprises without described ac/dc rectifier and carries out direct voltage after voltage is adjusted.
Need to prove, in embodiments of the present invention, 710 pairs of voltages of described ac/dc rectifier are adjusted specifically and are comprised, ac/dc rectifier 710 compensates the input voltage of self, with the input voltage after compensating as the first direct voltage, for example, the input voltage of ac/dc rectifier 710 is 100V, and 100V is raise is 200V; 710 pairs of voltages of described ac/dc rectifier are not adjusted and are specially, ac/dc rectifier 710 with self input voltage directly as the second direct voltage.
Wherein, described inverter 720 is used for receiving described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are processed, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, described inverter 720 is operated in high frequency sinusoidal pulse width modulation state, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
Perhaps, when receiving described the second operating voltage, described inverter 720 is operated in the power frequency state, and the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, exports the 4th operating voltage, and described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
Further, two kinds of multi-form voltages of ac/dc rectifier 710 outputs.The first form is: 710 outputs of ac/dc rectifier comprise the power frequency sine wave voltage of first direct voltage that superposeed; The first direct voltage is undertaken exporting on the bus after the voltage adjustment by ac/dc rectifier 710; Power frequency sine wave voltage is also exported on the bus by ac/dc rectifier 710.When busbar voltage was the first direct voltage, inverter 720 carried out the high frequency power transmission.When busbar voltage was power frequency sine wave voltage, inverter 720 carried out the power frequency power delivery.At this moment, inverter 720 does not need to carry out HF switch, only is direct mode operation.Therefore, loss can further reduce.Simultaneously, zero crossing distortion, the problems such as voltage distortion also can significantly be improved.
The second form is: 710 outputs of ac/dc rectifier comprise the power frequency sine wave voltage of second direct voltage that superposeed; The second direct voltage is directly provided by the input side voltage of ac/dc rectifier 710; The second direct voltage is directly exported on the bus by ac/dc rectifier 710, and at this moment, ac/dc rectifier 710 is in pass-through state, and ac/dc rectifier 710 does not have switching loss; Power frequency sine wave voltage is also exported on the bus by ac/dc rectifier 710.When busbar voltage was the second direct voltage, inverter 720 carried out the high frequency power transmission.When busbar voltage was power frequency sine wave voltage, inverter 720 carried out the power frequency power delivery, and at this moment, inverter 720 does not need to carry out HF switch, only is direct mode operation.Therefore, loss can further reduce.Simultaneously, zero crossing distortion, the problems such as voltage distortion also can significantly be 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 rectifier 710 or the inverter 720 all is in pass-through state.Therefore, the whole system operating efficiency can improve greatly.
Because first, second operating voltage amplitude of ac/dc rectifier 710 outputs is lower, the amplitude of first, second operating voltage is near the zero passage place, avoided inverter 720 when first, second operating voltage filtering output that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, the voltage stress of the power switch pipe in the inverter 720 is lower, reduces the conduction loss of power tube.
In another preferred embodiment, 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 the 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 is shared single-phase bus, and the operation principle of above-mentioned two kinds of connected modes is identical.
When described AC-dc converter 810 was connected with inverter 820, described first operating voltage of described AC-dc converter 810 outputs comprised: the power frequency sinusoidal voltage of stack dc offset voltage also, described the second operating voltage is the power frequency sinusoidal voltage;
Described inverter 820, be used for receiving described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are carried out filtering process, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, described inverter 820 is operated in three-phase high frequency sinusoidal pulse width modulation state, and described the first operating voltage is carried out low-pass filtering treatment, exports the 3rd operating voltage, and described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading, the first operating voltage of output when the power inverter shown in Fig. 5-A is connected with three-phase inverter, described the first operating voltage is power frequency sinusoidal voltage and the dc offset voltage that superposes; The 3rd operating voltage curve chart of the inverter output shown in Fig. 5-B, the 3rd operating voltage is three-phase voltage;
Perhaps, when receiving described the second operating voltage, described inverter 820 is operated in the three-phase main-frequency state, described the second operating voltage is provided to the three-phase output loading, the second operating voltage of output when the power inverter shown in Fig. 6-A is connected with three-phase inverter, described the second operating voltage is the power frequency sinusoidal voltage, the second operating voltage curve chart of the inverter output shown in Fig. 6-B, and this second operating voltage is three-phase voltage.
Because first, second operating voltage amplitude of AC-dc converter 810 outputs is lower, the amplitude of first, second operating voltage is near the zero passage place, avoided inverter 820 when first, second operating voltage filtering output that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, inverter 820 can be successively to A, B, the output of C three-phase alternating current.Thereby can improve A, B, C three-phase inverter power delivery; Make each all similar with single-phase bus mutually, therefore, improved A, B, the power delivery of C three-phase inverter and power transmission efficiency; The voltage stress of the power switch pipe in the inverter is lower, reduces the conduction loss of power tube.
The inverter that provides by using the embodiment of the invention, the ac/dc rectifier is exported the first operating voltage or the second operating voltage, the first operating voltage is carried different voltages from the second operating voltage, inverter self is operated in high frequency sinusoidal pulse width modulation state or power frequency state according to the first operating voltage or the second operating voltage adjustment that receive, after the first operating voltage or the second operating voltage processed, provide to output loading, because the operating voltage amplitude of ac/dc rectifier output is lower, the amplitude of operating voltage is near the zero passage place, avoided inverter when the synthetic power frequency output voltage of the operating voltage that will receive, cause the problem of the intermodulation distortion at zero passage place, simultaneously, the voltage stress of the power switch pipe in the inverter is lower, reduce the conduction loss of power tube, also can reduce the bus capacitor of inverter.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the specific embodiment of the invention is described in further detail.
The below describes the inverse method flow chart that the embodiment of the invention provides, the inverse method flow chart that Fig. 9 provides for the embodiment of the invention in detail as an example of Fig. 9 example.As shown in Figure 9, the specific implementation inverse method needs following steps:
Particularly, in an example, export the first operating voltage, the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, and described the first direct voltage specifically comprises the direct voltage that carries out after voltage is adjusted;
In another example, export the second operating voltage, the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed, described the second direct voltage is specially the direct voltage that does not carry out after voltage is adjusted.
Need explanation, in embodiments of the present invention, the described voltage that carries out is adjusted into voltage is compensated.
Particularly, when receiving described the first operating voltage, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
Perhaps, when receiving described the second operating voltage, the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, export the 4th operating voltage, described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
Alternatively, the power frequency sinusoidal voltage that described the first operating voltage comprises the dc offset voltage that superposeed also, described the second operating voltage also can be the power frequency sinusoidal voltage.
Further, when receiving the first operating voltage, when described the first operating voltage comprises the power frequency sinusoidal voltage of the dc offset voltage that superposeed, described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading;
When receiving described the second operating voltage, when described the second operating voltage is the power frequency sinusoidal voltage, described the second operating voltage is provided to the three-phase output loading.
The inverse method that provides by using the embodiment of the invention, export the first operating voltage or the second operating voltage, the first operating voltage is carried different voltages from the second operating voltage, self be operated in high frequency sinusoidal pulse width modulation state or power frequency state according to the first operating voltage or the second operating voltage adjustment that receive, after the first operating voltage or the second operating voltage processed, provide to output loading, because the operating voltage amplitude of DC to DC converter output is lower, the amplitude of operating voltage is near the zero passage place, avoided when the synthetic power frequency output voltage of the operating voltage that will receive, causing the problem of the intermodulation distortion at zero passage place.
The professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; the protection range that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an inverter is characterized in that, described device comprises:
Power inverter, be used for output the first operating voltage or the second operating voltage, described the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, described the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed, described the first direct voltage specifically comprises through described power inverter and carries out direct voltage after voltage is adjusted, and described the second direct voltage specifically comprises without described power inverter and carries out direct voltage after voltage is adjusted;
Inverter, be used for receiving described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are processed, described the first operating voltage or described the second operating voltage after processing are provided to output loading.
2. inverter according to claim 1 is characterized in that, described inverter specifically is used for:
When receiving described the first operating voltage, described inverter is operated in high frequency sinusoidal pulse width modulation state, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
When receiving described the second operating voltage, described inverter is operated in the power frequency state, and the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, exports the 4th operating voltage, and described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
3. inverter according to claim 1 is characterized in that, described first operating voltage of described power inverter output comprises the power frequency sinusoidal voltage of the dc offset voltage that superposeed, and described the second operating voltage comprises the power frequency sinusoidal voltage.
4. inverter according to claim 3 is characterized in that, described inverter specifically is used for:
When receiving described the first operating voltage, described inverter is operated in three-phase high frequency sinusoidal pulse width modulation state, and described the first operating voltage is carried out low-pass filtering treatment, exports the 3rd operating voltage, and described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading;
When receiving described the second operating voltage, described inverter is operated in the three-phase main-frequency state, and described the second operating voltage is provided to the three-phase output loading.
5. an inverse method is characterized in that, described method comprises:
Export the first operating voltage or the second operating voltage, described the first operating voltage comprises the power frequency sinusoidal voltage of first direct voltage that superposeed, described the second operating voltage comprises the power frequency sinusoidal voltage of second direct voltage that superposeed, described the first direct voltage specifically comprises the direct voltage that carries out after voltage is adjusted, and described the second direct voltage specifically comprises without the direct voltage after the voltage adjustment;
Receive described the first operating voltage or described the second operating voltage, described the first operating voltage or described the second operating voltage are processed, described the first operating voltage or described the second operating voltage after processing are provided to output loading.
6. inverse method according to claim 5, it is characterized in that, described the first operating voltage of described reception or described the second operating voltage, described the first operating voltage or described the second operating voltage are carried out filtering process, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, the first direct voltage in described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to output loading;
When receiving described the second operating voltage, the second direct voltage in described the second operating voltage is carried out low-pass filtering treatment, export the 4th operating voltage, described the 4th operating voltage is the power frequency sinusoidal voltage; Described the 4th operating voltage is provided to output loading.
7. inverse method according to claim 5 is characterized in that, described the first operating voltage comprises the power frequency sinusoidal voltage of the dc offset voltage that superposeed, and described the second operating voltage comprises the power frequency sinusoidal voltage.
8. inverse method according to claim 7, it is characterized in that, described the first operating voltage of described reception or described the second operating voltage, described the first operating voltage or described the second operating voltage are carried out filtering process, described the first operating voltage after processing or described the second operating voltage are provided to output loading specifically comprise:
When receiving described the first operating voltage, described the first operating voltage is carried out low-pass filtering treatment, export the 3rd operating voltage, described the 3rd operating voltage is the power frequency sinusoidal voltage; Described the 3rd operating voltage is provided to the three-phase output loading;
When receiving described the second operating voltage, described the second operating voltage is provided to the three-phase output loading.
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| 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 |
| JP2012023916A (en) * | 2010-07-16 | 2012-02-02 | Mitsubishi Electric Corp | Electric power conversion device |
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| JP2012023916A (en) * | 2010-07-16 | 2012-02-02 | Mitsubishi Electric Corp | Electric power conversion device |
| 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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