CN108206646B - Voltage type single-stage multi-input non-isolated inverter with built-in parallel time-sharing selection switch - Google Patents
Voltage type single-stage multi-input non-isolated inverter with built-in parallel time-sharing selection switch Download PDFInfo
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- CN108206646B CN108206646B CN201810020150.7A CN201810020150A CN108206646B CN 108206646 B CN108206646 B CN 108206646B CN 201810020150 A CN201810020150 A CN 201810020150A CN 108206646 B CN108206646 B CN 108206646B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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Abstract
The invention relates to a voltage type single-stage multi-input non-isolated inverter with a built-in parallel time-sharing selection switch, which has a circuit structure that a multi-input single-output high-frequency inverter circuit with a built-in parallel time-sharing selection four-quadrant power switch connects a plurality of common-ground input filters with a common output filter circuit, each input end of the multi-input single-output high-frequency inverter circuit is correspondingly connected with the output end of each input filter one by one, and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the output filter circuit. The inverter has the characteristics of common-ground multi-input source and time-sharing power supply, no isolation of output and input, common output filter circuit, simple circuit topology, single-stage power conversion, high conversion efficiency, small output voltage ripple, wide application prospect and the like, and lays a key technology for realizing a large-capacity distributed power supply system for jointly supplying power by various new energy sources.
Description
Technical Field
The invention relates to a built-in parallel time-sharing selection switch voltage type single-stage multi-input non-isolated inverter, belonging to the power electronic conversion technology.
Background
The inverter is a static converter which applies a power semiconductor device to convert unstable and poor direct current electric energy into stable and good alternating current electric energy, and is used for alternating current loads or realizes alternating current grid connection. The inverters with and without electrical isolation between the output alternating current load or the alternating current grid and the input direct current power supply are respectively called isolated type inverters and non-isolated type inverters. The non-isolated inverter has the characteristics of simple circuit structure, high reliability, large output capacity, low cost and the like, and has important application value in secondary electric energy conversion occasions taking a direct current generator, a storage battery, a photovoltaic cell, a fuel cell and the like as main direct current power supplies.
The new energy sources (also called green energy sources) such as solar energy, wind energy, tidal energy, geothermal energy and the like have the advantages of cleanness, no pollution, low price, reliability, richness and the like, thereby having wide application prospect. Due to the increasing shortage of traditional fossil energy (non-renewable energy) such as petroleum, coal and natural gas, serious environmental pollution, global warming, nuclear waste generated by nuclear energy production, environmental pollution and the like, the development and utilization of new energy are receiving more and more attention. The new energy power generation mainly comprises photovoltaic, wind power, fuel cells, water power, geothermal energy and the like, and all the types have the defects of unstable and discontinuous power supply, change along with climatic conditions and the like, so that a distributed power supply system adopting various new energy sources for combined power supply is needed.
A traditional new energy distributed power supply system is shown in figures 1 and 2. The system generally adopts a plurality of single-input direct-current converters to convert electric energy of new energy power generation equipment which does not need energy storage, such as photovoltaic cells, fuel cells, wind driven generators and the like, through one unidirectional direct-current converter respectively, and the output ends of the new energy power generation equipment are connected to a direct-current bus of a common inverter in parallel or in series, so that the combined power supply of various new energy sources is ensured, and the coordinated work can be realized. The distributed power generation system realizes the priority utilization of the power supplied by a plurality of input sources to the load and the energy, improves the stability and the flexibility of the system, but has the defects of two-stage power conversion, low power density, low conversion efficiency, high cost and the like, and the practicability of the distributed power generation system is limited by a great degree.
In order to simplify the circuit structure and reduce the number of power conversion stages, a novel single-stage new energy distributed power supply system needs to be formed by replacing the conventional multi-input inverter with a direct-current converter and an inverter two-stage cascade circuit structure shown in fig. 1 and 2 by the novel multi-input inverter with a single-stage circuit structure shown in fig. 3. The single-stage multi-input inverter allows for multiple new energy inputs, and the nature, magnitude and characteristics of the input sources may be the same or may vary widely. The novel single-stage new energy distributed power supply system has the advantages of simple circuit structure, single-stage power conversion, low cost and the like, and a plurality of input sources simultaneously or in time-sharing mode supply power to a load in one high-frequency switching period.
Therefore, the active search for a single-stage multi-input inverter allowing multiple new energy sources to supply power jointly and a new energy source distributed power supply system thereof is urgent, and the active search has a very important significance for improving the stability and flexibility of the system and realizing the prior utilization or the full utilization of the new energy sources.
Disclosure of Invention
The invention aims to provide a voltage type single-stage multi-input non-isolated inverter with a built-in parallel time-sharing selection switch, which has the characteristics of combined power supply of various new energy sources, common ground of input direct-current power supplies, built-in parallel time-sharing selection switch of a multi-input single-output high-frequency inverter circuit, no isolation between output and input, time-sharing power supply of a plurality of input power supplies within one switching period, simple circuit topology, shared output filter circuit, single-stage power conversion, high conversion efficiency, small output voltage ripple, large output capacity, wide application prospect and the like.
The technical scheme of the invention is as follows: a voltage type single-stage multi-input non-isolated inverter with a built-in parallel time-sharing selection switch is formed by connecting a plurality of input filters which are connected with the ground with a common output filter circuit through a multi-input single-output high-frequency inverter circuit, wherein each input end of the multi-input single-output high-frequency inverter circuit is correspondingly connected with the output end of each input filter one by one, and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the output filter circuit; the multi-input single-output high-frequency inverter circuit consists of a plurality of built-in bidirectional power flow single-input single-output high-frequency inverter circuits which are connected in parallel and select four-quadrant power switches in a time-sharing manner, and is equivalent to a bidirectional power flow single-input single-output high-frequency inverter circuit at any moment; the output filter circuit is formed by sequentially cascading an output filter inductor and an output filter capacitor, or formed by sequentially cascading the output filter inductor, the output filter capacitor and the output filter inductor.
The invention relates to a multi-input inverter circuit structure formed by cascading a direct current converter and an inverter of a traditional multi-new-energy combined power supply system in two stages, which is constructed into a novel single-stage multi-input inverter circuit structure with a built-in parallel time-sharing selection switch, and provides a voltage type single-stage multi-input non-isolated inverter circuit structure with a built-in parallel time-sharing selection switch, a topology family and an energy management control strategy thereof, namely the circuit structure is formed by connecting a plurality of common-ground input filters and a common output filter circuit through a multi-input single-output high-frequency inverter circuit with a built-in parallel time-sharing selection four-quadrant power switch.
The voltage type single-stage multi-input non-isolated inverter with the built-in parallel time-sharing selection switch can invert a plurality of common-ground unstable input direct-current voltages into stable and high-quality output alternating-current power required by a load, and has the characteristics that a multi-input direct-current power supply is common-ground, a multi-input single-output high-frequency inverter circuit is not isolated, the output and the input are not isolated, the multi-input power supply supplies power in a time-sharing mode within one switching period, the circuit topology is simple, a common output filter circuit is used, single-stage power conversion is realized, the conversion efficiency is high, the output voltage ripple is small, the output capacity is large, the application. The comprehensive performance of the voltage type single-stage multi-input non-isolated inverter with the built-in parallel time-sharing selection switch is superior to that of a multi-input inverter formed by two-stage cascading of a traditional direct-current converter and an inverter.
Drawings
Fig. 1 shows a conventional two-stage new energy distributed power supply system with a plurality of unidirectional dc converters connected in parallel at output terminals.
Fig. 2 shows a conventional two-stage new energy distributed power supply system with a plurality of unidirectional dc converters connected in series at output terminals.
Fig. 3 is a schematic block diagram of a novel single-stage multiple-input inverter.
Fig. 4 is a schematic block diagram of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 5 is a circuit structure diagram of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 6 is a steady-state schematic waveform diagram of a voltage type single-stage multiple-input non-isolated inverter with built-in parallel time-sharing selection switches controlled by a bipolar SPWM.
Fig. 7 is a steady-state schematic waveform diagram of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch controlled by a unipolar SPWM.
Fig. 8 is a schematic diagram i of a half-bridge circuit, which is a circuit topology example of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 9 is a schematic diagram ii of a circuit topology example of a built-in parallel time-sharing selection switch voltage type single-stage multiple-input non-isolated inverter circuit, i.e., a half-bridge circuit.
Fig. 10 is a schematic diagram iii of a three-half bridge circuit of a circuit topology example of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 11 is a schematic diagram i of a four-full bridge circuit as an example of a circuit topology of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 12 is a schematic diagram ii of a five-full bridge circuit of a circuit topology example of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 13 is a schematic diagram iii of a six-full bridge circuit of a circuit topology example of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 14 is a master-slave power distribution energy management control block diagram of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch, in which instantaneous values of output voltage and input current are fed back to a bipolar SPWM.
Fig. 15 is a waveform diagram of a master-slave power distribution energy management control principle of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch, in which instantaneous values of output voltage and input current are fed back to a bipolar SPWM.
Fig. 16 is a block diagram of a master-slave power distribution energy management control of a single-polarity SPWM feedback by an instantaneous value of output voltage and input current of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch.
Fig. 17 is a waveform diagram of the output voltage and input current instantaneous value feedback unipolar SPWM master-slave power distribution energy management control principle of the voltage type single-stage multiple-input non-isolated inverter with the built-in parallel time-sharing selection switch.
Fig. 18 shows a built-in parallel time-sharing selective switch voltage type single-stage multiple-input non-isolated independent power supply system with an output connected in parallel with a single-stage isolated bidirectional charge-discharge converter.
Fig. 19, maximum power output energy management control strategy with single stage isolated bidirectional charge-discharge converter output voltage independent control loop.
FIG. 20, output voltage u of independent power supply systemoAnd outputting the filtered inductor current iLf、iLf' waveform.
Detailed Description
The technical solution of the present invention is further described below with reference to the drawings and examples of the specification.
The voltage type single-stage multi-input non-isolated inverter with the built-in parallel time-sharing selection switch is formed by connecting a plurality of input filters which are connected with the ground with a common output filter circuit through a multi-input single-output high-frequency inverter circuit, wherein each input end of the multi-input single-output high-frequency inverter circuit is correspondingly connected with the output end of each input filter one by one, and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the output filter circuit; the multi-input single-output high-frequency inverter circuit consists of a plurality of built-in bidirectional power flow single-input single-output high-frequency inverter circuits which are connected in parallel and select four-quadrant power switches in a time-sharing manner, and is equivalent to a bidirectional power flow single-input single-output high-frequency inverter circuit at any moment; the output filter circuit is formed by sequentially cascading an output filter inductor and an output filter capacitor, or formed by sequentially cascading the output filter inductor, the output filter capacitor and the output filter inductor.
Schematic block diagrams, circuit structures, stable-state principle waveforms of the built-in parallel time-sharing selection switch voltage type single-stage multi-input non-isolated inverter, the bipolar SPWM control inverter and the unipolar SPWM control inverter are respectively shown in FIGS. 4, 5, 6 and 7. In FIGS. 4, 5, 6 and 7, Ui1、Ui2、…、UinInputting a DC voltage source (n is a natural number greater than 1) for n paths, ZLFor single-phase output AC loads (including single-phase AC passive loads and single-phase AC grid loads), uo、ioRespectively single-phase output alternating voltage and alternating current. The n-input single-output high-frequency inverter circuit is composed of a plurality of built-in bidirectional power flow single-input single-output high-frequency inverter circuits connected in parallel and selecting four-quadrant power switches in a time-sharing manner; the n-input single-output high-frequency inverter circuit consists of multiple four-quadrant high-frequency powers capable of bearing bidirectional voltage stress and bidirectional current stressThe switch and one or more two-quadrant high-frequency power switches capable of bearing unidirectional voltage stress and bidirectional current stress, or only a plurality of four-quadrant high-frequency power switches capable of bearing bidirectional voltage stress and bidirectional current stress, wherein power devices such as MOSFET, IGBT, GTR and the like can be selected; the output filter in the virtual frame (the ends A and B are the connecting ends) is composed of an output filter inductor, or is composed of an output filter inductor and an output filter capacitor which are sequentially cascaded, or is composed of an output filter inductor, an output filter capacitor and an output filter inductor which are sequentially cascaded, the output inductor and the capacitor filter are suitable for a passive alternating current load, and the output inductor filter or the output inductor, the capacitor and the inductor filter are suitable for an alternating current power grid load; the n-path input filter is an LC filter (filter inductor L with an added virtual frame)i1、Li2、…、Lin) Or a capacitor filter (filter inductor L without adding a virtual frame)i1、Li2、…、Lin) When an LC filter is adopted, the n input direct current paths are smoother. The n-input single-output high-frequency inverter circuit inputs n paths of direct-current voltage sources Ui1、Ui2、…、UinModulating into bipolar two-state or unipolar three-state multi-level SPWM voltage wave with amplitude varying with input DC voltage, and filtering via output filter inductor LfAn output filter capacitor CfThen high-quality sine alternating-current voltage u is obtained on the single-phase alternating-current passive loadoOr via an output filter inductor LfOr output filter inductor Lf1An output filter capacitor CfAn output filter inductor Lf2Then high-quality sine alternating current i is obtained on the single-phase alternating current networkoN input pulse currents of n-input single-output high-frequency inverter circuit are input to a filter Li1-Ci1、Li2-Ci2、…、Lin-CinOr Ci1、Ci2、…、CinThen inputting a direct current power supply U in n pathsi1、Ui2、…、UinTo obtain a smooth input direct current Ii1、Ii2、…、Iin. It should be added that the dual-polarity two-state and single-polarity three-state multi-level SPWM voltage wave uABThe +1 state amplitude is Ui1、Ui2、…、UinAnd the-1 state amplitude is Uin(here, it is designed to pass only the nth input source UinThe energy at the alternating current side is fed back, and the energy at the alternating current side can also be designed to be fed back through any other input source); the half-bridge circuit only has a bipolar two-state multi-level SPWM voltage wave uABThe +1 state amplitude and the-1 state amplitude at the positive and negative half cycles of the output voltage should be multiplied by 1/2.
A voltage type single-stage multi-input non-isolated inverter with a built-in parallel time-sharing selection switch belongs to a step-down inverter, and n input sources supply power to a load in parallel time-sharing mode. Let n-1 output signals I of the input source error amplifier1e、I2e、…、I(n-1)eAnd the output signal u of the output voltage error amplifiereHas an amplitude of I1em、I2em、I(n-1)em、UemSaw-tooth carrier signal ucHas an amplitude of UcmThen the corresponding modulation degree is m1＝I1em/Ucm、m2＝I2em/Ucm、…、mn＝Uem/UcmAnd has a value of 0 < m1、m2、…、mn< 1 and m1＜m2＜…＜mn. The principle of the inverter is equivalent to the superposition of voltages at the output end of a plurality of voltage type single-input inverters, namely the output voltage uoAnd input direct current voltage (U)i1、Ui2、…、Uin) Degree of modulation (m)1、m2、…、mn) The relationship between is uo＝(m1Ui1+(m2-m1)Ui2+…+(mn-mn-1)Uin) (unipolar SPWM control) or uo＝(2m1-1)Ui1+(2m2-2m1-1)Ui2+…+(2mn-2mn-1-1)Uin) (bipolar SPWM control). Due to the existence of 0 < m1+(m2-m1)+…+(mn-mn-1) < 1 (unipolar SPWM control) and 0.5 < m1+(m2-m1)+…+(mn-mn-1) < 1 (Bipolar SPWM control)System) so that uo＜Ui1+Ui2+…+UinI.e. the output voltage uoIs always lower than the input DC voltage Ui1、Ui2、…、UinSum of Ui1+Ui2+…+Uin(ii) a Because the inverter belongs to a single-stage circuit structure, and the multi-path parallel time-sharing selection four-quadrant power switch is positioned in the high-frequency inverter circuit, the inverter is called a built-in parallel time-sharing selection switch voltage type (voltage reduction type) single-stage multi-input non-isolated inverter. The n input sources of the inverter can only supply power to the output alternating current load in a time-sharing way in one high-frequency switching period, and the modulation degrees can be the same (m1＝m2＝…＝mn) Or may be different (m)1≠m2≠…≠mn)。
The voltage type single-stage multi-input non-isolated inverter with the built-in parallel time-sharing selection switch has essential difference from the circuit structure of the traditional multi-input inverter formed by two-stage cascade connection of a direct current converter and an inverter because the voltage type single-stage multi-input non-isolated inverter shares a multi-input single-output high-frequency inverter circuit and an output filter circuit. Therefore, the inverter provided by the invention has novelty and creativity, and has the advantages of no isolation of output and input, time-sharing power supply of a multi-input power supply, simple circuit topology, single-stage power conversion, high conversion efficiency (meaning small energy loss), small output voltage ripple, large output capacity, low cost, wide application prospect and the like, is an ideal energy-saving and consumption-reducing single-stage multi-input inverter, and has important value in the situation of vigorously advocating the construction of energy-saving and energy-saving society at present.
An embodiment of a circuit topology family of a voltage type single-stage multiple-input non-isolated inverter with a built-in parallel time-sharing selection switch is shown in fig. 8, 9, 10, 11, 12 and 13. The half-bridge circuit shown in fig. 8, 9 and 10 is implemented by 2n four-quadrant high-frequency power switches capable of bearing bidirectional voltage stress and bidirectional current stress and 1 two-quadrant high-frequency power switch capable of bearing unidirectional voltage stress and bidirectional current stress, and the full-bridge circuit shown in fig. 11, 12 and 13 is implemented by 2n four-quadrant high-frequency power switches capable of bearing bidirectional voltage stress and bidirectional current stress and 2 four-quadrant high-frequency power switches capable of bearing bidirectional voltage stress and bidirectional current stressThe two-quadrant high-frequency power switch is realized under the stress of unidirectional voltage and bidirectional current. It should be noted that the circuits shown in fig. 8-13 show the case where the input filter is an LC filter (the input filter capacitance of the half-bridge circuit shown in fig. 8, 9 and 10 is two bridge arm capacitances C)1、C2) The circuit is not given in space when the input filter is a capacitive filter; the circuits shown in fig. 8-13 do not necessarily all employ four-quadrant high-frequency power switches, and 1 or 2 two-quadrant high-frequency power switches are omitted; the half-bridge circuits shown in fig. 8, 9 and 10 are only suitable for the case where the n input power supply voltages are substantially equal; the output filters of the half-bridge circuits i, ii, and iii shown in fig. 8, 9, and 10 are an output L filter, an output LC filter, and an output LCL filter, respectively, and the output filters of the full-bridge circuits i, ii, and iii shown in fig. 11, 12, and 13 are an output L filter, an output LC filter, and an output LCL filter, respectively. The power switch voltage stress of two topological embodiments of the built-in parallel time-sharing selection switch voltage type single-stage multiple-input non-isolated inverter is shown in table 1. In Table 1, Uimax＝max(Ui1，Ui2，…，Uin). The half-bridge circuit is suitable for medium-power high-voltage input inversion occasions, and the full-bridge circuit is suitable for high-power high-voltage input inversion occasions. The circuit topology family is suitable for converting a plurality of common-ground unstable input direct-current voltages into output alternating-current with required voltage and stable and high quality, and can be used for realizing a novel single-stage multiple new energy distributed power supply system with excellent performance and wide application prospect, such as a photovoltaic cell 400 VDC/220V50HzAC or 115V400HzAC, a large-scale wind power generation 510VDC/220V50HzAC or 115V400HzAC and other multiple input sources for supplying power to an alternating-current load or an alternating-current power grid.
Table 1 built-in parallel time-sharing selection switch voltage type single-stage multiple-input non-isolated inverter two topology embodiments power switch voltage stress
The energy management control strategy is crucial to various new energy combined power supply systems. Due to the presence of multiple input sources and corresponding power switching units, multiple duty cycles need to be controlled, i.e. there are multiple degrees of freedom of control, which provides the possibility for energy management of multiple new energy sources. An energy management control strategy of a built-in parallel time-sharing selection switch voltage type single-stage multi-input non-isolated inverter needs to have three functions of energy management of an input source, MPPT (maximum power point tracking) and output voltage (current) control of new energy power generation equipment such as a photovoltaic cell and a wind driven generator, and sometimes, the charging and discharging control of a storage battery and smooth and seamless switching of a system under different power supply modes need to be considered. The voltage type single-stage multi-input non-isolated inverter with the built-in parallel time-sharing selection switch adopts two different energy management modes: (1) in the energy management mode I, namely a master-slave power distribution mode, the power required by a load is known to be provided by the 1 st, 2 nd, … th and n-1 st input sources of the master power supply equipment as much as possible, the input current of the 1 st, 2 nd, … th and n-1 st input sources is given, which is equivalent to the input power of the 1 st, 2 nd, … th and n-1 st input sources, the insufficient power required by the load is provided by the nth input source of the slave power supply equipment, and a storage battery energy storage device does not need to be added; (2) in the energy management mode II, namely the maximum power output mode, the 1 st input source, the 2 nd input source, the … th input source and the n th input source are all output to a load with the maximum power, storage battery energy storage equipment is omitted, the requirement of a grid-connected power generation system on the full utilization of energy is met, and if an output end is connected with a storage battery charging and discharging device in parallel, the stability of the output voltage (current) of an independent power supply system can be realized. When the input voltage of the n paths of new energy sources is given, the input current of the 1 st, 2 nd, … th and n paths of input sources is controlled, so that the input power of the 1 st, 2 nd, … th and n paths of input sources is controlled.
A voltage type single-stage multi-input non-isolated inverter with a built-in parallel time-sharing selection switch adopts a master-slave power distribution energy management control strategy of feeding back bipolar SPWM and unipolar SPWM by output voltage and input current instantaneous values to form an independent power supply system; or the maximum power output energy management control strategy of the bipolar SPWM and the unipolar SPWM is fed back by the input current instantaneous value to form a grid-connected power generation system. Fixed output power of 1 st, 2 nd, … th input source and insufficient power needed by nth input source for supplementing loadThe output voltage and input current instantaneous values are fed back to a bipolar SPWM and unipolar SPWM master-slave power distribution energy management control block diagram and a control principle waveform, which are respectively shown in FIGS. 14, 15, 16 and 17. Input current feedback signal I of inverter 1 st, 2 nd, … th and n-1 th pathsi1f、Ii2f、…、Ii(n-1)fRespectively obtaining reference current signals I after maximum power point calculation with the 1 st, 2 nd, … th and n-1 th input sourcesi1r、Ii2r、…、Ii(n-1)rThe error signal I is amplified by comparison of a proportional-integral regulator1e、I2e、…、I(n-1)eRespectively multiplied by sine synchronous signals, and then the obtained result is an | i through absolute value circuits 1, 2, … and n-11e︳、︳i2e︱、…、︳i(n-1)e| the inverter outputs a voltage feedback signal uofWith reference sinusoidal voltage urThe error signal u is amplified and compared by a proportional-integral regulatoreObtaining an agent u after passing through an absolute value circuit ne︳,︱i1e︳、︳i2e︱、…、︳i(n-1)e︱、︱ueThe data/bus and the sawtooth carrier ucThe output voltage gating signal is processed by a proper combinational logic circuit to obtain a control signal u of the power switchgs11、ugs21、…、ugsn1、ugs12、ugs22、…、ugsn2、ugs′11、ugs′21、…、ugs′n1、ugs′12、ugs′22、…、ugs′n2、ugs3、ugs4. The 1 st, 2 nd, … th and n-1 th circuit current regulators and the n-1 th circuit voltage regulator work independently respectively, the 1 st, 2 nd, … th and n-1 th circuit current regulators are used for realizing the maximum power output of the 1 st, 2 nd, … th and n-1 th circuit input sources, the n-1 th circuit voltage regulator is used for realizing the stabilization of the output voltage of the inverter, and the n-1 th circuit input sources jointly supply power to a load. By regulating the reference voltage u as the input voltage or load variesrAnd a reference current ii1r、ii2r、…、ii(n-1)rOr regulating the feedback voltage uofAnd a feedback current ii1f、ii2f、…、ii(n-1)fTo change error voltage signal | ueA/d and error current signal | i1e︳、︳i2e︱、…、︳i(n-1)e| thereby changing the degree of modulation m1、m2、…、mnTherefore, the regulation and stabilization of the output voltage and the input current (output power) of the inverter can be realized.
When the nth path input source in fig. 14-17 is designed as input current feedback to control the input current, a maximum power output energy management control strategy of input current instantaneous value feedback bipolar SPWM and unipolar SPWM is formed. Input current feedback signal I of inverter 1 st, 2 nd, … th and n th pathsi1f、Ii2f、…、IinfRespectively obtaining reference current signals I after maximum power point calculation with the 1 st, 2 nd, … th and n-th input sourcesi1r、Ii2r、…、IinrComparing and amplifying by a proportional-integral regulator, and amplifying an error signal I1e、I2e、…、IneMultiplying the sine synchronous signal respectively by absolute value circuits 1, 2, … and n to obtain an | i1e︳、︳i2e︱、…、︳ine︱，︱i1e︳、︳i2e︱、…、︳ine| respectively associated with sawtooth carrier ucThe output voltage gating signal is processed by a proper combinational logic circuit to obtain a control signal u of the power switchgs11、ugs21、…、ugsn1、ugs12、ugs22、…、ugsn2、ugs′11、ugs′21、…、ugs′n1、ugs′12、ugs′22、…、ugs′n2、ugs3、ugs4. The 1 st, 2 nd, … th circuit current regulators and the n-th circuit current regulators respectively work independently and are all used for realizing the maximum power output of respective input sources, and the n-th circuit input sources jointly supply power to a load.
The waveform of the bipolar and unipolar SPWM control principle shown in FIGS. 15 and 17 marks the high-frequency switching period TSAnd a certain high frequency switching period TSConduction time T of internal 1 st, 2 nd, … th input sourceon1、Ton2、…、TonnAnd total on-time Ton＝Ton1+Ton2+…+TonnTotal on-time TonThe variation in the output voltage period is sinusoidal. In addition, for the half-bridge circuits I, II, III shown in FIGS. 8, 9, 10, half the value of the input DC voltage (U) should be usedi1/2、Ui2/2、…、UinAnd/2) substituting into the voltage transfer ratio for calculation.
In order to form an independent power supply system capable of fully utilizing energy of multiple input sources, multiple input sources should operate in a maximum power output mode and energy storage equipment needs to be configured to achieve stabilization of output voltage, that is, a single-stage isolation bidirectional charge-discharge converter is connected in parallel to an output end of an inverter, as shown in fig. 18. The single-stage isolation bidirectional charge-discharge converter consists of an input filter (L)i、CiOr Ci) High-frequency inverter, high-frequency transformer, cycle converter, output filter (L)f′、Cf') is cascaded in sequence, and the cycle converter is composed of four-quadrant high-frequency power switches capable of bearing bidirectional voltage stress and bidirectional current stress. The single-stage isolation bidirectional charge-discharge converter is respectively equivalent to a single-stage high-frequency link DC-AC converter and a single-stage high-frequency link AC-DC converter when energy is transmitted in the forward direction (energy storage equipment is discharged) and transmitted in the reverse direction (energy storage equipment is charged).
The independent power supply system adopts a maximum power output energy management control strategy with a single-stage isolated bidirectional charge-discharge converter output voltage independent control loop, as shown in fig. 19. When the load power Po＝UoIoGreater than the sum P of the maximum powers of the plurality of input sources1max+P2max+…+PnmaxWhen the power supply is started, energy storage equipment such as a storage battery, a super capacitor and the like provides needed insufficient power to a load through a single-stage isolation bidirectional charge-discharge converter, namely a power supply mode II, and the energy storage equipment independently provides power to the load, namely a power supply mode III, and belongs to the extreme situation of the power supply mode II; when the load power Po＝UoIoLess than the sum P of the maximum powers of the plurality of input sources1max+P2max+…+PnmaxAnd in the time, the residual energy output by the plurality of input sources is used for charging the energy storage equipment through the single-stage isolation bidirectional charging and discharging converter, namely, the power supply mode I. Using the band elimination load as an example, the power flow direction control of the single-stage isolation bidirectional charge-discharge converter is discussed, as shown in fig. 20. For output filter capacitor Cf、Cf' and load ZLIn other words, the parallel connection of the output ends of the voltage type single-stage multi-input non-isolated inverter and the single-stage isolated bidirectional charge-discharge converter with the built-in parallel time-sharing selection switch is equivalent to the parallel connection superposition of two current sources. As can be seen from the energy management control strategy shown in FIG. 19, the output filter inductor current i of the voltage type single-stage multi-input non-isolated inverter with built-in parallel time-sharing selection switchLfAnd the output voltage uoThe same frequency and the same phase are adopted, and active power is output; the charging and discharging converter is controlled by the output voltage uoAnd a reference voltage uorefError amplified signal uoeIntercepting with high frequency carrier to generate SPWM signal for control, outputting filter inductor current iLf' and uoThere is a phase difference theta between them, and a different phase difference theta means that active power with different magnitude and direction is output. When P is presento＝P1max+P2max+…+PnmaxWhen theta is equal to 90 degrees, the active power output by the charge-discharge converter is zero, and the charge-discharge converter is in an idle state; when P is presento>P1max+P2max+…+PnmaxWhen u is turned onoThe theta is reduced to be less than 90 degrees, the charging and discharging converter outputs active power, and the energy storage equipment discharges to the load, namely the energy storage equipment provides insufficient power required by the load; when P is presento＜P1max+P2max+…+PnmaxWhen u is turned onoAnd increasing theta to be more than 90 degrees, outputting negative active power by the charging and discharging converter, feeding energy back to the energy storage device by the load, namely charging the energy storage device by residual power output by the plurality of input sources, and feeding the energy back to the energy storage device by the load to be the maximum when the theta is 180 degrees. Thus, the energy management control strategy can be based on PoAnd P1max+P2max+…+PnmaxThe relative size of the single-stage isolation bidirectional charge-discharge converter controls the power flow size and direction of the single-stage isolation bidirectional charge-discharge converter in real time, and smooth and seamless switching of the system under three different power supply modes is realized.
Claims (2)
1. A voltage type single-stage multi-input non-isolated inverter with a built-in parallel time-sharing selection switch is characterized in that: the inverter is formed by sequentially cascading a bidirectional power flow n-input single-output high-frequency inverter circuit and an output filter, wherein each input end of the bidirectional power flow n-input single-output high-frequency inverter circuit is cascaded with one input filter, the n input filters are grounded, n is the number of multiple input sources, and n is a natural number greater than 1; the bidirectional power flow n-input single-output high-frequency inverter circuit is formed by n paths of bidirectional power flow built-in single-input single-output high-frequency inverter circuits connected in parallel with the time-sharing selection four-quadrant power switch, only one path of bidirectional power flow built-in single-input single-output high-frequency inverter circuit connected in parallel with the time-sharing selection four-quadrant power switch works at any moment, and each path of single-input single-output high-frequency inverter circuit is of a full-bridge or half-bridge structure; the left and right upper bridge arms of each full-bridge type and half-bridge type high-frequency inverter circuit are respectively composed of 1 built-in parallel time-sharing selection four-quadrant power switch capable of bearing bidirectional voltage stress and bidirectional current stress, the built-in parallel time-sharing selection four-quadrant power switch of the left upper bridge arm of the half-bridge type high-frequency inverter circuit is further connected with a capacitor in series, the left and right lower bridge arms of each full-bridge type high-frequency inverter circuit are respectively composed of 1 two-quadrant power switch capable of bearing unidirectional voltage stress and bidirectional current stress, the left and right lower bridge arms of each half-bridge type high-frequency inverter circuit are respectively composed of 1 capacitor and two-quadrant power switches capable of bearing unidirectional voltage stress and bidirectional current stress, one end of the built-in parallel time-sharing selection four-quadrant power switch of the left and right upper bridge arms of each full-bridge type and half-bridge type high-frequency inverter circuit is respectively connected together, The other end of the input filter is connected with the output end of the input filter; the output filter is an L filter, or an LC filter, or an LCL filter; the bidirectional power flow n input single output high frequency inverter circuit of the inverter inputs n paths of direct current voltage source Ui1、Ui2、…、UinModulating into bipolar two-state or unipolar three-state n-level SPWM voltage wave with level amplitude varying with input source voltage, filtering via outputObtaining sinusoidal alternating voltage or grid-connected sinusoidal current on a single-phase alternating current load after a wave filter; the +1 state level amplitude values of the bipolar two-state and unipolar three-state n-level SPWM voltage waves of the full-bridge circuit are respectively Ui1、Ui2、…、UinWhen inputting the source U through the n-th pathinThe amplitude of the-1 state level when the energy on the AC side of the feedback inverter is UinThe +1 state level amplitudes of the bipolar two-state n-level SPWM voltage wave of the half-bridge circuit are respectively Ui1/2、Ui2/2、…、Uin2, when inputting the source U through the n-th pathinThe amplitude of the-1 state level when the energy on the AC side of the feedback inverter is Uin2; the working mechanism of the inverter is equivalent to the superposition of the voltages of the output ends of n voltage type single-input inverters, and the output voltage u is output during the control of single-polarity and bipolar SPWMoN input source voltages and n input source voltage modulation degree m1、m2、…、mnThe relationship between each other is uo＝m1Ui1+(m2-m1)Ui2+…+(mn-mn-1)Uin、uo＝(2m1-1)Ui1+(2m2-2m1-1)Ui2+…+(2mn-2mn-1-1)Uin，0＜m1、m2、…、mn＜1，m1＜m2＜…＜mn(ii) a The voltage stress of the two-quadrant power switch of the high-frequency inverter circuit is UimaxThe voltage stress of the 1 st, 2 nd, … th and n th paths of built-in parallel time-sharing selection four-quadrant power switches of the high-frequency inverter circuit is respectively Ui1、Ui2、…、UinThe voltage stress of only the 1 st, 2 nd, … th and n-th four-quadrant power switches of the upper left bridge arm of the half-bridge circuit is max | UiN-Ui1∣、max∣UiN-Ui2∣、…、max∣UiN-Uin∣，Uimax＝max(Ui1，Ui2，…，Uin) N is 1, 2, …, N; the independent power supply system formed by the inverters adopts output electricity with fixed output power of the 1 st, 2 nd, … nd and n-1 st input sources and insufficient power required by the n-th input source for supplementing loadsVoltage and input current instantaneous values are fed back to a bipolar SPWM or unipolar SPWM master-slave power distribution energy management control strategy, a grid-connected power generation system formed by the inverter adopts 1 st, 2 nd, … th input source input current instantaneous values to feed back the bipolar SPWM or unipolar SPWM maximum power output energy management control strategy; the inverter determines the number of input sources needing to be put into operation by controlling the on and off of n paths of built-in parallel time-sharing selection four-quadrant power switches according to the size of an alternating current load, and the n paths of input sources are U-shaped in one high-frequency switching periodi1、Ui2、…、UinThe power is supplied to the alternating current load in parallel connection in sequence and time sharing, and the single-stage high-efficiency non-isolated voltage reduction inversion of n common-ground unstable input direct current voltages into stable sinusoidal alternating current required by one load is realized.
2. The built-in parallel time-sharing selective switch voltage type single-stage multi-input non-isolated inverter of claim 1, wherein: the output end of the built-in parallel time-sharing selection switch voltage type single-stage multi-input non-isolated inverter is connected with a single-stage isolation bidirectional charge-discharge converter of the energy storage device in parallel, so that an independent power supply system which can fully utilize the energy of the n input sources and has stable output voltage is formed; the single-stage isolation bidirectional charge-discharge converter is formed by sequentially cascading an input filter, a high-frequency inverter, a high-frequency transformer, a cycle converter and an output filter, wherein the cycle converter is formed by a four-quadrant high-frequency power switch capable of bearing bidirectional voltage stress and bidirectional current stress, and the single-stage isolation bidirectional charge-discharge converter is respectively equivalent to a single-stage voltage type high-frequency link DC-AC converter and a single-stage current type high-frequency link AC-DC converter when the energy storage equipment is discharged and charged; the independent power supply system adopts a management control strategy of the maximum power output energy of n input sources with a single-stage isolation bidirectional charge-discharge converter output voltage independent control loop, the n input sources all work in a maximum power output mode, the power flow size and direction of the single-stage isolation bidirectional charge-discharge converter are controlled in real time according to the relative size of the sum of the load power and the maximum power of the n input sources, and the smooth seamless switching of the output voltage of the system and the charge and discharge of energy storage equipment is realized; when the load power is greater than the sum of the maximum powers of the n input sources, the system works in a power supply mode II in which the energy storage device provides required insufficient power to the load through the single-stage isolation bidirectional charge-discharge converter, a power supply mode III in which the energy storage device supplies power to the load independently belongs to the extreme situation of the power supply mode II, and when the load power is less than the sum of the maximum powers of the n input sources, the system works in a power supply mode I in which the residual energy output by the n input sources charges the energy storage device through the single-stage isolation bidirectional charge-discharge converter; for an output filter capacitor and a load, the output ends of the voltage type single-stage multi-input non-isolated inverter and the single-stage isolated bidirectional charge-discharge converter with the built-in parallel connection time-sharing selection switch are connected in parallel and are equivalent to the parallel superposition of two current sources; the method comprises the steps that 1, 2, … and n paths of input source output currents are subjected to error amplification with 1, 2, … and n paths of input source maximum power point reference currents respectively, the 1 st, 2, … and n paths of error amplification signals are multiplied by sinusoidal synchronous signals and then are intersected with the same high-frequency carrier signal respectively to generate 1 st, 2 nd, … and n paths of signals to control an n path of input inverter, the n path of input inverter outputs filtering inductive currents which are in the same frequency and the same phase as output voltages and outputs active power, and SPWM signals are generated by the intersection of the error amplification signals of the system output voltages and the reference voltages and the high-frequency carrier signals to control the output filtering inductive currents and the system output voltages of the charge-discharge converter, wherein phase differences theta and different phase differences theta mean that active power with different magnitudes and directions are output; when the load power is equal to the sum of the maximum powers of the n input sources, theta is equal to 90 degrees, the active power output by the charging and discharging converter is zero, when the load power is larger than the sum of the maximum powers of the n input sources, the output voltage is reduced, theta is smaller than 90 degrees, the charging and discharging converter outputs the active power, namely the insufficient power required by the load by the energy storage device, when the load power is smaller than the sum of the maximum powers of the n input sources, the output voltage is increased, theta is larger than 90 degrees, and the charging and discharging converter outputs the negative active power, namely the residual power output by the n input sources to charge the.
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| CN101534059A (en) * | 2009-04-14 | 2009-09-16 | 福州大学 | Single-isolation pressure increase and reduction type multi-input direct current converter |
| CN101534054A (en) * | 2009-04-14 | 2009-09-16 | 福州大学 | Single-isolation combination pressure increase and reduction type multi-input direct current converter |
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| CN101534059A (en) * | 2009-04-14 | 2009-09-16 | 福州大学 | Single-isolation pressure increase and reduction type multi-input direct current converter |
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Application publication date: 20180626 Assignee: Shenzhen Growatt New Energy Technology Co.,Ltd. Assignor: QINGDAO University Contract record no.: X2023980033813 Denomination of invention: Built-in parallel time sharing selective switching voltage type single stage multi input non isolated inverter Granted publication date: 20201106 License type: Common License Record date: 20230320 |
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