CN101071948A - High-efficiency single-phase and three-phase grid-connected generating system - Google Patents

Abstract

This invention relates to a high efficiency single-phase and the three-phase incorporation generating system. This incorporation generating system is composed by the high frequency inverter, immittance convertor, high-frequency transformer, high frequency rectifier, power frequency inverter, lowpass filter, voltage zero crossing detector, high frequency drive circuit and power frequency drive circuit. This system counter turn the direct voltage which are gained by light battery array, fuel cell, windpower generation and other methods to high-frequency voltage and input immittance convertor. The high-frequency current output by immittance convertor is merged into single-phase or three-phase electric network olationand by the high-frequency transformer, ranking transformed by electric current, commutated by the high frequency rectifier, counter turned by the power frequency inverter and filtered by lowpass filter. By improving the system topology, reducing the power transistor number, this invention not only reduces the cost, realize installment miniaturization, but also reduces the power loss in the energy transfer process.

Description

A kind of high efficiency single-phase and three-phase grid-connected generating system

Technical field

The present invention relates to a kind of high efficiency single-phase and three-phase grid-connected generating system.

Background technology

The applicant provides a kind of grid-connected system in " the current mode photovoltaic parallel in system and the control device thereof " of first to file, employing high-frequency inductor and high frequency transformer have substituted frequency inductance and the Industrial Frequency Transformer in the type photovoltaic parallel in system of conventional current source, though overcome traditional frequency inductance and shortcomings such as the Industrial Frequency Transformer volume is big, consumptive material is many, loss is big, cost is high, inhibition harmonic wave ability, but also exist the power transistor number more, the higher high not enough problem of system effectiveness that causes of device for power switching conduction loss in the energy transfer process.

Summary of the invention

The object of the present invention is to provide a kind of high efficiency single-phase and three-phase grid-connected generating system, by improving system topology, reduce the power transistor number, not only reduce system cost, the implement device miniaturization also reduces the power loss in the energy transfer process.

For achieving the above object, the present invention adopts following technical proposals:

A kind of high efficiency single-phase and three-phase grid-connected generating system, be made up of high-frequency inverter, immittance converter, high frequency transformer, hf rectifier, power frequency inverter and low pass filter, it is characterized in that the structure that described high-frequency inverter is used for single phase system is: the positive pole of photovoltaic battery array is connected to a power transistor V ₁Collector electrode promptly drain and a capacitor C _D1A _Cd1End, the negative pole of photovoltaic battery array is connected to a power transistor V ₂Emitter be source electrode and a capacitor C _D2B _Cd2End, power transistor V ₁Emitter be that source electrode is connected to power transistor V ₂Collector electrode promptly drain and output to an input of described immittance converter, capacitor C _D1B _Cd1End is connected to capacitor C _D2A _Cd2Hold and output to another input of described immittance converter; The structure that high-frequency inverter is used for three-phase system is: the positive pole of photovoltaic battery array is connected to three power transistor V ₁, V ₃, V ₅Collector electrode promptly drain and a capacitor C _D1A _Cd1End, the negative pole of photovoltaic battery array is connected to three power transistor V ₂, V ₄, V ₆Emitter be source electrode and a capacitor C _D2B _Cd2End, power transistor V ₁Emitter be that source electrode is connected to power transistor V ₄Collector electrode promptly drain and output to an input of described immittance converter R phase, power transistor V ₃Emitter be that source electrode is connected to power transistor V ₆Collector electrode promptly drain and output to an input of described immittance converter S phase, power transistor V ₅Emitter be that source electrode is connected to power transistor V ₂Collector electrode promptly drain and output to an input of described immittance converter T phase, capacitor C _D1B _Cd1End is connected to capacitor C _D2A _Cd2Hold and output to a public input O of described immittance converter.

In the above-mentioned high efficiency single-phase and three-phase grid-connected generating system, the structure that described immittance converter is used for single phase system is: an output of described high-frequency inverter is connected to an inductance L _R1A _LR1End, another output is connected to a capacitor C _RB _CREnd, inductance L _R1B _LR1End, capacitor C _RA _CREnd and inductance L _R2A _LR2End links together, inductance L _R2B _LR2End outputs to an input of described high frequency transformer, capacitor C _RB _CREnd outputs to another input of described high frequency transformer; The structure that immittance converter is used for three-phase system is: an inductance L _R1, another inductance L _R2With a capacitor C _RForm R phase immittance converter, the R phase output terminal of described high-frequency inverter is connected to inductance L _R1A _LR1End, the public output O of described high-frequency inverter is connected to capacitor C _RB _CREnd, inductance L _R1B _LR1End, capacitor C _RA _CREnd and inductance L _R2A _LR2End links together, inductance L _R2B _LR2End outputs to TR in the described high frequency transformer _RInput of transformer, capacitor C _RB _CREnd outputs to TR in the described high frequency transformer _RAnother input of transformer; An inductance L _S1, another inductance L _S2With a capacitor C _SForm S phase immittance converter, the S phase output terminal of described high-frequency inverter is connected to inductance L _S1A _LS1End, the public output O of described high-frequency inverter is connected to capacitor C _SB _CSEnd, inductance L _S1B _LS1End, capacitor C _SA _CSEnd and inductance L _S2A _LS2End links together, inductance L _S2B _LS2End outputs to TR in the described high frequency transformer _SInput of transformer, capacitor C _SB _CSEnd outputs to TR in the described high frequency transformer _SAnother input of transformer; An inductance L _T1, another inductance L _T2With a capacitor C _TForm T phase immittance converter, the T phase output terminal of described high-frequency inverter is connected to inductance L _T1A _LT1End, the public output O of described high-frequency inverter is connected to capacitor C _TB _CTEnd, inductance L _T1B _LT1End, capacitor C _TA _CTEnd and inductance L _T2A _LT2End links together, inductance L _T2B _LT2End outputs to TR in the described high frequency transformer _TInput of transformer, capacitor C _TB _CTEnd outputs to TR in the described high frequency transformer _TAnother input of transformer;

In the above-mentioned high efficiency single-phase and three-phase grid-connected generating system, the structure that described high frequency transformer is used for single phase system is: inductance L in the described immittance converter _R2B _LR2End is input to a of high frequency transformer _TRREnd, capacitor C in the immittance converter _RB _CREnd is input to the b of high frequency transformer _TRREnd, the c of high frequency transformer _TRREnd outputs to an input of described hf rectifier, the e of high frequency transformer _TRREnd outputs to another input of described hf rectifier, the d of high frequency transformer _TRREnd outputs to an input of described low pass filter; The structure that high frequency transformer is used for three-phase system is: inductance L in the described immittance converter _R2B _LR2End is input to TR _RThe a of high frequency transformer _TRREnd, capacitor C in the immittance converter _RB _CREnd is input to TR _RThe b of high frequency transformer _TRREnd, TR _RThe c of high frequency transformer _TRREnd outputs to an input, the TR of described hf rectifier R phase _RThe e of high frequency transformer _TRREnd outputs to another input of described hf rectifier R phase, TR _RThe d of high frequency transformer _TRREnd outputs to an input of described low pass filter R phase; Inductance L in the described immittance converter _S2B _LS2End is input to TR _SThe a of high frequency transformer _TRSEnd, capacitor C in the immittance converter _SB _CSEnd is input to TR _SThe b of high frequency transformer _TRSEnd, TR _SThe c of high frequency transformer _TRSEnd outputs to an input, the TR of described hf rectifier S phase _SThe e of high frequency transformer _TRSEnd outputs to another input of described hf rectifier S phase, TR _SThe d of high frequency transformer _TRSEnd outputs to an input of described low pass filter S phase; Inductance L in the described immittance converter _T2B _LT2End is input to TR _TThe a of high frequency transformer _TRTEnd, capacitor C in the immittance converter _TB _CTEnd is input to TR _TThe b of high frequency transformer _TRTEnd, TR _TThe c of high frequency transformer _TRTEnd outputs to an input, the TR of described hf rectifier T phase _TThe e of high frequency transformer _TRTEnd outputs to another input of described hf rectifier T phase, TR _TThe d of high frequency transformer _TRTEnd outputs to an input of described low pass filter T phase.

In the above-mentioned high efficiency single-phase and three-phase grid-connected generating system, the structure that described hf rectifier is used for single phase system is: an output c of described high frequency transformer _TRRBe connected to a diode VD _R1Anode and another diode VD _R2Negative electrode, another output e _TRRBe connected to a diode VD _R3Anode and another diode VD _R4Negative electrode, diode VD _R1Negative electrode and diode VD _R3Negative electrode link together and output to an input of described power frequency inverter, diode VD _R2Anode and diode VD _R4Anode link together and output to another input of described power frequency inverter; The structure that hf rectifier is used for three-phase system is: described high frequency transformer TR _RAn output c _TRRBe connected to a diode VD _R1Anode and another diode VD _R2Negative electrode, another output e _TRRBe connected to a diode VD _R3Anode and another diode VD _R4Negative electrode, diode VD _R1Negative electrode and diode VD _R3Negative electrode link together and output to an input of described power frequency inverter R phase, diode VD _R2Anode and diode VD _R4Anode link together and output to another input of described power frequency inverter R phase; Described high frequency transformer TR _SAn output c _TRSBe connected to a diode VD _S1Anode and another diode VD _S2Negative electrode, another output e _TRSBe connected to diode VD _S3Anode and diode VD _S4Negative electrode, diode VD _S1Negative electrode and diode VD _S3Negative electrode link together and output to an input of described power frequency inverter S phase, diode VD _S2Anode and diode VD _S4Anode link together and output to another input of described power frequency inverter S phase; Described high frequency transformer TR _TAn output c _TRTBe connected to diode VD _T1Anode and diode VD _T2Negative electrode, another output e _TRTBe connected to diode VD _T3Anode and diode VD _T4Negative electrode, diode VD _T1Negative electrode and diode VD _T3Negative electrode link together and output to an input of described power frequency inverter T phase, diode VD _T2Anode and diode VD _T4Anode link together and output to another input of described power frequency inverter T phase.

In the above-mentioned high efficiency single-phase and three-phase grid-connected generating system, the structure that described power frequency inverter is used for single phase system is: diode VD in the described hf rectifier _R1Negative electrode and diode VD _R3Negative electrode output to a power transistor V _R1Collector electrode promptly drain or anode diode VD in the hf rectifier _R2Anode and diode VD _R4Anode output to another power transistor V _R2Emitter be source electrode or anode, power transistor V _R1Emitter be that source electrode or anode are connected to power transistor V _R2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter; The structure that the power frequency inverter is used for three-phase system is: diode VD in the described hf rectifier _R1Negative electrode and diode VD _R3Negative electrode output to a power transistor V _R1Collector electrode promptly drain or anode diode VD in the hf rectifier _R2Anode and diode VD _R4Anode output to another power transistor V _R2Emitter be source electrode or anode, power transistor V _R1Emitter be that source electrode or anode are connected to power transistor V _R2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter R phase; Diode VD in the described hf rectifier _S1Negative electrode and diode VD _S3Negative electrode output to a power transistor V _S1Collector electrode promptly drain or anode diode VD in the hf rectifier _S2Anode and diode VD _S4Anode output to another power transistor V _S2Emitter be source electrode or anode, power transistor V _S1Emitter be that source electrode or anode are connected to power transistor V _S2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter S phase; Diode VD in the described hf rectifier _T1Negative electrode and diode VD _T3Negative electrode output to a power transistor V _T1Collector electrode promptly drain or anode diode VD in the hf rectifier _T2Anode and diode VD _T4Anode output to another power transistor V _T2Emitter be source electrode or anode, power transistor V _T1Emitter be that source electrode or anode are connected to power transistor V _T2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter T phase.

In the above-mentioned high efficiency single-phase and three-phase grid-connected generating system, the structure that described low pass filter is used for single phase system is: the output of described power frequency inverter is connected to a capacitor C _R1A _CR1End and an inductance L _R1A _LR1End, an output d of described high frequency transformer _TRRBe connected to capacitor C _R1B _CR1End, inductance L _R1B _R1End outputs to an input of described electrical network, capacitor C _R1B _R1End outputs to another input of described electrical network; The structure that low pass filter is used for three-phase system is: the R phase output terminal of described power frequency inverter is connected to a capacitor C _R1A _CR1End and an inductance L _R1A _LR1End, described high frequency transformer TR _RAn output d _TRRBe connected to capacitor C _R1B _CR1End, inductance L _R1B _R1End outputs to the R phase input of described electrical network; The S phase output terminal of described power frequency inverter is connected to a capacitor C _S1A _CS1End and an inductance L _S1A _LS1End, described high frequency transformer TR _SAn output d _TRSBe connected to capacitor C _S1B _CS1End, inductance L _S1B _S1End outputs to the S phase input of described electrical network; The T phase output terminal of described power frequency inverter is connected to a capacitor C _T1A _CT1End and an inductance L _T1A _LT1End, described high frequency transformer TR _TAn output d _TRTBe connected to capacitor C _T1B _CT1End, inductance L _T1B _T1End outputs to the T phase input of described electrical network.Capacitor C _R1B _CR1End, capacitor C _S1B _CS1End and capacitor C _T1B _CT1End links together.

The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: the direct voltage that the present invention obtains photovoltaic battery array, fuel cell, wind power generation and other the whole bag of tricks is reverse into high frequency voltage input immittance converter.The high-frequency current of immittance converter output is isolated and the current class conversion through high frequency transformer, again by being incorporated into single-phase or three phase network after hf rectifier rectification, the inversion of power frequency inverter and the low pass filter filtering.The present invention reduces the power transistor number by improving system topology, not only reduces system cost, and the implement device miniaturization also reduces the power loss in the energy transfer process.

Description of drawings

Fig. 1 distributed grid-connected system of the present invention and control device block diagram.

Fig. 2 is the single-phase current type inverter circuit schematic diagram of traditional use immittance converter.

Fig. 3 is a single-phase current type inverter circuit schematic diagram of the present invention.

Fig. 4 is another circuit theory diagrams of single-phase current type inverter of the present invention.

Fig. 5 is a three-phase current of the present invention source type inverter circuit schematic diagram.

Fig. 6 is another circuit theory diagrams of three-phase current of the present invention source type inverter.

Fig. 7 is T-LCL type immittance converter circuit theory diagrams.

Fig. 8 is the high frequency voltage schematic diagram of high-frequency inverter output.

Fig. 9 is triangular carrier-triangle modulating wave modulation system schematic diagram.

Figure 10 is triangular carrier-triangle modulating wave modulation system and high-frequency inverter drive signal schematic diagram.

Figure 11 is a monophasic pulses if counting subroutine FB(flow block).

Figure 12 is single-phase high-frequency impulse product process block diagram.

Figure 13 is a single phase industrial frequence pulse product process block diagram.

Figure 14 is a three-phase pulse counting subroutine FB(flow block).

Figure 15 is a three-phase high-frequency impulse product process block diagram.

Figure 16 is a three-phase main-frequency pulse product process block diagram.

Figure 17 is the experimental waveform figure of immittance converter output end current.

Figure 18 is the experimental waveform figure of grid-connected current of the present invention and line voltage.

Embodiment

Details are as follows in conjunction with the accompanying drawings for the preferred embodiments of the present invention:

Embodiment one: (single-phase grid-connected system is referring to Fig. 3, Fig. 4)

This high efficiency single-phase grid-connected system, be made up of high-frequency inverter 2, immittance converter 3, high frequency transformer 4, hf rectifier 5, power frequency inverter 6 and low pass filter 7, it is characterized in that the structure of described high-frequency inverter 2 is: the positive pole of photovoltaic battery array 1 is connected to power transistor V ₁Collector electrode (drain electrode) and capacitor C _D1A _Cd1End, the negative pole of photovoltaic battery array 1 is connected to power transistor V ₂Emitter (source electrode) and capacitor C _D2B _Cd2End, power transistor V ₁Emitter (source electrode) be connected to power transistor V ₂Collector electrode (drain electrode) and output to an input of described immittance converter 3, capacitor C _D1B _Cd1End is connected to capacitor C _D2A _Cd2Hold and output to another input of described immittance converter 3.

In this high efficiency single-phase grid-connected system, it is characterized in that the structure of described immittance converter 3 is: an output of described high-frequency inverter 2 is connected to inductance L _R1A _LR1End, another output is connected to capacitor C _RB _CREnd, inductance L _R1B _LR1End, capacitor C _RA _CREnd and inductance L _R2A _LR2End links together, inductance L _R2B _LR2End outputs to an input of described high frequency transformer 4, capacitor C _RB _CREnd outputs to another input of described high frequency transformer 4.

In this high efficiency single-phase grid-connected system, it is characterized in that the structure of described high frequency transformer 4 is: inductance L in the described immittance converter 3 _R2B _LR2End is input to a of high frequency transformer _TRREnd, capacitor C _RB _CREnd is input to the b of high frequency transformer _TRREnd, the c of high frequency transformer _TRREnd outputs to an input of described hf rectifier 5, the e of high frequency transformer _TRREnd outputs to another input of described hf rectifier 5, the d of high frequency transformer _TRREnd outputs to an input of described low pass filter 7.

In this high efficiency single-phase grid-connected system, it is characterized in that the structure of described hf rectifier 5 is: an output c of described high frequency transformer 4 _TRRBe connected to diode VD _R1Anode and diode VD _R2Negative electrode, another output e _TRRBe connected to diode VD _R3Anode and diode VD _R4Negative electrode, diode VD _R1Negative electrode and diode VD _R3Negative electrode link together and output to an input of described power frequency inverter 6, diode VD _R2Anode and diode VD _R4Anode link together and output to another input of described power frequency inverter 6;

In this high efficiency single-phase and the three-phase grid-connected generating system, it is characterized in that the structure of described power frequency inverter 6 is: diode VD in the described hf rectifier 5 _R1Negative electrode and diode VD _R3Negative electrode output to power transistor V _R1Collector electrode (drain electrode), diode VD in the hf rectifier 5 _R2Anode and diode VD _R4Anode output to power transistor V _R2Emitter (source electrode), power transistor V _R1Emitter (source electrode) be connected to power transistor V _R2Collector electrode (drain electrode) and output to an input of described low pass filter 7.

In this high efficiency single-phase grid-connected system, it is characterized in that the structure of described low pass filter 7 is: the output of described power frequency inverter 6 is connected to capacitor C _R1A _CR1End and inductance L _R1A _LR1End, an output d of described high frequency transformer 4 _TRRBe connected to capacitor C _R1B _CR1End, inductance L _R1B _R1End outputs to an input of described electrical network 8, capacitor C _R1B _R1End outputs to another input of described electrical network 8.

Embodiment two: (the three-phase grid system is referring to Fig. 5, Fig. 6)

This high efficiency three-phase grid-connected generating system, be made up of high-frequency inverter 2, immittance converter 3, high frequency transformer 4, hf rectifier 5, power frequency inverter 6 and low pass filter 7, it is characterized in that the structure of described high-frequency inverter 2 is: the positive pole of photovoltaic battery array 1 is connected to power transistor V ₁Collector electrode (drain electrode), power transistor V ₃Collector electrode (drain electrode), power transistor V ₅Collector electrode (drain electrode) and capacitor C _D1A _Cd1End, the negative pole of photovoltaic battery array 1 is connected to power transistor V ₄Emitter (source electrode), power transistor V ₆Emitter (source electrode), power transistor V ₂Emitter (source electrode) and capacitor C _D2B _Cd2End, power transistor V ₁Emitter (source electrode) be connected to power transistor V ₄Collector electrode (drain electrode) and output to an input of described immittance converter 3R phase, power transistor V ₃Emitter (source electrode) be connected to power transistor V ₆Collector electrode (drain electrode) and output to an input of described immittance converter 3S phase, power transistor V ₅Emitter (source electrode) be connected to power transistor V ₂Collector electrode (drain electrode) and output to an input of described immittance converter 3T phase, capacitor C _D1B _Cd1End is connected to capacitor C _D2A _Cd2Hold and output to a public input O of described immittance converter 3.

In this high efficiency three-phase grid-connected generating system, it is characterized in that the structure of described immittance converter 3 is: inductance L _R1, inductance L _R2And capacitor C _RForm R phase immittance converter, the R phase output terminal of described high-frequency inverter 2 is connected to inductance L _R1A _LR1End, the public output O of described high-frequency inverter 2 is connected to capacitor C _RB _CREnd, inductance L _R1B _LR1End, capacitor C _RA _CREnd and inductance L _R2A _LR2End links together, inductance L _R2B _LR2End outputs to the TR of described high frequency transformer 4 _RInput of transformer, capacitor C _RB _CREnd outputs to the TR of described high frequency transformer 4 _RAnother input of transformer; Inductance L _S1, inductance L _S2And capacitor C _SForm S phase immittance converter, the S phase output terminal of described high-frequency inverter 2 is connected to inductance L _S1A _LS1End, the public output O of described high-frequency inverter 2 is connected to capacitor C _SB _CSEnd, inductance L _S1B _LS1End, capacitor C _SA _CSEnd and inductance L _S2A _LS2End links together, inductance L _S2B _LS2End outputs to the TR of described high frequency transformer 4 _SInput of transformer, capacitor C _SB _CSEnd outputs to the TR of described high frequency transformer 4 _SAnother input of transformer; Inductance L _T1, inductance L _T2And capacitor C _TForm T phase immittance converter, the T phase output terminal of described high-frequency inverter 2 is connected to inductance L _T1A _LT1End, the public output O of described high-frequency inverter 2 is connected to capacitor C _TB _CTEnd, inductance L _T1B _LT1End, capacitor C _TA _CTEnd and inductance L _T2A _LT2End links together, inductance L _T2B _LT2End outputs to the TR of described high frequency transformer 4 _TInput of transformer, capacitor C _TB _CTEnd outputs to the TR of described high frequency transformer 4 _TAnother input of transformer;

In this high efficiency three-phase grid-connected generating system, it is characterized in that the structure of described high frequency transformer 4 is: inductance L in the described immittance converter 3 _R2B _LR2End is input to TR _RThe a of high frequency transformer _TRREnd, capacitor C _RB _CREnd is input to TR _RThe b of high frequency transformer _TRREnd, TR _RThe c of high frequency transformer _TRREnd outputs to an input, the TR of R phase in the described hf rectifier 5 _RThe e of high frequency transformer _TRREnd outputs to another input of R phase in the described hf rectifier 5, TR _RThe d of high frequency transformer _TRREnd outputs to an input of R phase in the described low pass filter 7; Inductance L in the described immittance converter 3 _S2B _LS2End is input to TR _SThe a of high frequency transformer _TRSEnd, capacitor C _SB _CSEnd is input to TR _SThe b of high frequency transformer _TRSEnd, TR _SThe c of high frequency transformer _TRSEnd outputs to an input, the TR of S phase in the described hf rectifier 5 _SThe e of high frequency transformer _TRSEnd outputs to another input of S phase in the described hf rectifier 5, TR _SThe d of high frequency transformer _TRSEnd outputs to an input of S phase in the described low pass filter 7; Inductance L in the described immittance converter 3 _T2B _LT2End is input to TR _TThe a of high frequency transformer _TRTEnd, capacitor C _TB _CTEnd is input to TR _TThe b of high frequency transformer _TRTEnd, TR _TThe c of high frequency transformer _TRTEnd outputs to an input, the TR of T phase in the described hf rectifier 5 _TThe e of high frequency transformer _TRTEnd outputs to another input of T phase in the described hf rectifier 5, TR _TThe d of high frequency transformer _TRTEnd outputs to an input of T phase in the described low pass filter 7.

In this high efficiency single-phase and the three-phase grid-connected generating system, it is characterized in that the structure of described hf rectifier 5 is: TR in the described high frequency transformer 4 _RAn output c _TRRBe connected to diode VD _R1Anode and diode VD _R2Negative electrode, another output e _TRRBe connected to diode VD _R3Anode and diode VD _R4Negative electrode, diode VD _R1Negative electrode and diode VD _R3Negative electrode link together and output to an input of R phase in the described power frequency inverter 6, diode VD _R2Anode and diode VD _R4Anode link together and output to another input of R phase in the described power frequency inverter 6; TR in the described high frequency transformer 4 _SAn output c _TRSBe connected to diode VD _S1Anode and diode VD _S2Negative electrode, another output e _TRSBe connected to diode VD _S3Anode and diode VD _S4Negative electrode, diode VD _S1Negative electrode and diode VD _S3Negative electrode link together and output to an input of S phase in the described power frequency inverter 6, diode VD _S2Anode and diode VD _S4Anode link together and output to another input of S phase in the described power frequency inverter 6; TR in the described high frequency transformer 4 _TAn output c _TRTBe connected to diode VD _T1Anode and diode VD _T2Negative electrode, another output e _TRTBe connected to diode VD _T3Anode and diode VD _T4Negative electrode, diode VD _T1Negative electrode and diode VD _T3Negative electrode link together and output to an input of T phase in the described power frequency inverter 6, diode VD _T2Anode and diode VD _T4Anode link together and output to another input of T phase in the described power frequency inverter 6.

In this high efficiency three-phase grid-connected generating system, it is characterized in that the structure of described power frequency inverter 6 is: diode VD in the described hf rectifier 5 _R1Negative electrode and diode VD _R3Negative electrode output to power transistor V _R1Collector electrode (drain electrode), diode VD in the hf rectifier 5 _R2Anode and diode VD _R4Anode output to power transistor V _R2Emitter (source electrode), power transistor V _R1Emitter (source electrode) be connected to power transistor V _R2Collector electrode (drain electrode) and output to an input of R phase in the described low pass filter 7; Diode VD in the described hf rectifier 5 _S1Negative electrode and diode VD _S3Negative electrode output to power transistor V _S1Collector electrode (drain electrode), diode VD in the hf rectifier 5 _S2Anode and diode VD _S4Anode output to power transistor V _S2Emitter (source electrode), power transistor V _S1Emitter (source electrode) be connected to power transistor V _S2Collector electrode (drain electrode) and output to an input of S phase in the described low pass filter 7; Diode VD in the described hf rectifier 5 _T1Negative electrode and diode VD _T3Negative electrode output to power transistor V _T1Collector electrode (drain electrode), diode VD in the hf rectifier 5 _T2Anode and diode VD _T4Anode output to power transistor V _T2Emitter (source electrode), power transistor V _T1Emitter (source electrode) be connected to power transistor V _T2Collector electrode (drain electrode) and output to an input of T phase in the described low pass filter 7.

In this high efficiency single-phase and the three-phase grid-connected generating system, it is characterized in that the structure of described low pass filter 7 is: the R phase output terminal of described power frequency inverter 6 is connected to capacitor C _R1A _CR1End and inductance L _R1A _LR1End, TR in the described high frequency transformer 4 _RAn output d _TRRBe connected to capacitor C _R1B _CR1End, inductance L _R1B _R1End outputs to the R phase input of described electrical network 8; The S phase output terminal of described power frequency inverter 6 is connected to capacitor C _S1A _CS1End and inductance L _S1A _LS1End, TR in the described high frequency transformer 4 _SAn output d _TRSBe connected to capacitor C _S1B _CS1End, inductance L _S1B _S1End outputs to the S phase input of described electrical network 8; The T phase output terminal of described power frequency inverter 6 is connected to capacitor C _T1A _CT1End and inductance L _T1A _LT1End, TR in the described high frequency transformer 4 _TAn output d _TRTBe connected to capacitor C _T1B _CT1End, inductance L _T1B _T1End outputs to the T phase input of described electrical network 8.Capacitor C _R1B _CR1End, capacitor C _S1B _CS1End and capacitor C _T1B _CT1End links together.

The control method and the principle of this high efficiency single-phase and three-phase grid-connected generating system are summarized as follows:

Fig. 7 shows the T-LCL type immittance converter 3 that is made of lumped-parameter element L, C.Its four terminals expression formula is

$\left[\begin{array}{c}{V}_1\\ {\mathrm{<figure-callout\; id="1"\; label="I"\; filenames="A20071003874300211.png,A20071003874300221.png"\; state="\{\{state\}\}">I</figure-callout>}}_1\end{array}\right]\text{=}\left[\begin{array}{cc}\text{1-}{\mathrm{\&omega;}}^2\mathrm{LC}& \mathrm{j\&omega;L}(2-{\mathrm{\&omega;}}^2\mathrm{LC})\\ \mathrm{j\&omega;C}& 1-{\mathrm{\&omega;}}^2\mathrm{LC}\end{array}\right]\left[\begin{array}{c}{V}_2\\ I_2\end{array}\right]---\left(1\right)$

When high-frequency inverter 2 angular frequencies equal immittance converter 3 resonance angular frequencies, promptly $\mathrm{\&omega;}=1/\sqrt{\mathrm{LC}}$ The time, formula (1) can be reduced to:

$\left[\begin{array}{c}{V}_1\\ I_1\end{array}\right]=\left[\begin{array}{cc}0& {\mathrm{jZ}}_0\\ j/{\mathrm{<figure-callout\; id="0"\; label="Z"\; filenames="A20071003874300291.png"\; state="\{\{state\}\}">Z</figure-callout>}}_0& 0\end{array}\right]\left[\begin{array}{c}{V}_2\\ I_2\end{array}\right]---\left(2\right)$

$\left\{\begin{array}{c}{V}_1={\mathrm{jZ}}_0{I}_2\\ I_1={\mathrm{<figure-callout\; id="2"\; label="jV"\; filenames="A20071003874300211.png,A20071003874300221.png"\; state="\{\{state\}\}">jV</figure-callout>}}_2/Z_0\end{array}\right.---\left(3\right)$

In the formula $Z_{}$ ${}_0=\sqrt{L/C}$ Be resonance impedance.From formula (3) as can be seen, immittance converter 3 output currents are not subjected to load effect, only be directly proportional with input voltage, so immittance converter 3 can be realized the conversion between voltage source and the current source.

Table 1 shows each several part waveform and the computing formula of Fig. 1.According to the characteristic of immittance converter (suc as formula 3), can be from direct voltage E _dDerive grid-connected current I _G(see Table in 1 1.～7.):

E _dBe voltage between high-frequency inverter 2 positive and negative busbars;

Fig. 8 shows the high frequency voltage of high-frequency inverter 2 outputs.The PWM output voltage that B is ordered represents that with Fourier series getting the PWM voltage waveform is even function, and left-right symmetric, and pulse duration is D π, the Fourier series expression formula that obtains the B point voltage of can deriving (as in the table 1 2.).Wherein the sin item is represented the amplitude of each harmonic wave, and the cos item is represented switching frequency ω _sThe odd-multiple composition;

Immittance converter 3 is a kind of special low pass filters, and it is a current source with voltage source conversion, so C point electric current is resonance frequency (the switching frequency ω of m=1 _s) composition.Know that by formula (3) this electric current is the 1/Z of voltage ₀Doubly (see Table in 1 3.);

Suppose that high-frequency isolation transformer 4 no-load voltage ratios are 1: N, after transformer boosted, D and D ' some electric current decline N be (saw Table in 1 4.) doubly;

Through diode VD _R1～VD _R4After the rectification, that gets a D and D ' electric current thoroughly deserves E point and E ' some electric current (see Table in 1 5., 6.);

V by power frequency inverter 6 _R1～V _R2(see figure 3) or SCR ₂, SCR ₁(see figure 4), at the zero crossing of line voltage (angular frequency is ω) with the half period of π＜ω t＜2 π anti-phase (see Table in 1 7.);

Through the harmonic filtration of low pass filter 7 with radio-frequency component, F point electric current is carried out integration, because

$\frac{1}{\mathrm{\&pi;}}{\&Integral;}_{-\frac{\mathrm{\&pi;}}{2}}^{\frac{\mathrm{\&pi;}}{2}}\cos {\mathrm{\&omega;}}_S\mathrm{tdt}=\frac{2}{\mathrm{\&pi;}}$

Therefore, be fed to the electric current of electrical network by direct voltage E _dWith duty ratio D decision, with line voltage irrelevant (see Table in 1 8.).

Fig. 9,10 is triangular carrier-triangle modulating wave modulation schematic diagram.Suppose that modulating wave is triangular wave e _x=(V _B/ (pi/2)) ω t according to Fig. 9 intermediate cam shape similitude, has D=e _x/ V _B,, solve 8. formula in its substitution table 1

$I_G=\frac{{8E}_d}{{\mathrm{\&pi;}}^2\mathrm{<figure-callout\; id="0"\; label="N\; Z"\; filenames="A20071003874300291.png"\; state="\{\{state\}\}">N</figure-callout>}{Z}_{}{}_0}\&CenterDot;\sin \mathrm{\&omega;t}---\left(4\right)$

After adopting triangular wave-triangular modulation pattern, can generate sinusoidal wave grid-connected current, and this algorithm is easy to realize.

Figure 11, Figure 12, Figure 13 illustrate single-phase grid-connected system single-chip microcomputer 12 specific algorithm flow charts.Single-chip microcomputer 12 at first carries out parameter initialization after powering on and moving, and inquires about the instruction of being incorporated into the power networks then, in case receive the instruction of being incorporated into the power networks, single-chip microcomputer 12 is carried out high-frequency PWM pulse generators, carries out the high-frequency inversion operation.

Figure 11 is a monophasic pulses if counting subroutine FB(flow block).

1. voltage sensor 14 detected direct voltage E _d9 detected grid-connected current i are input to single-chip microcomputer 12 with current sensor;

2. single-chip microcomputer 12 calculates the electric current I that can output to electrical network according to formula (4) _G

3. I _GThe and instruction current i ^*Relatively, in case instruction current surpasses the maximum grid-connected current I that inverter 2 can be exported _G, 2 output of inverter maximum current I _G, and by the single-chip microcomputer 12 alarms value of reaching capacity.Instruction current i ^*The grid-connected current i that arrives with actual detected relatively, when instruction current greater than actual current i, then increase output current by increasing modulation depth M, promptly M increases Δ M; If instruction current less than actual current i, then reduces output current by reducing modulation depth M, promptly M reduces Δ M.Adjusted modulation depth M is compared with maximum, irreducible minimum amplitude; If surpass amplitude limit value, maximum or irreducible minimum amplitude sent into modulation depth M; Call the high-frequency inverter pulse then and generate subprogram; If do not surpass amplitude limit value, directly call the high-frequency inverter pulse and generate subprogram;

4. call single-phase high-frequency inverter pulse and generate subprogram;

5. judge whether to capture the line voltage crossover point signal:

Capture the line voltage crossover point signal, call the pulse of single phase industrial frequence inverter and generate subprogram;

Do not capture the line voltage crossover point signal, jump to step 6.;

6. return.

Its single-phase high-frequency inverter pulse generates subprogram as shown in figure 12, mainly finishes calculating of high-frequency inverter pulse duration and drive signal and generates.

Be carved into current time grid-connected current operation angle difference Δ θ when 1. calling according to the last secondary program of line voltage frequency computation part;

2. with last time grid-connected current operation angle θ add that differential seat angle Δ θ is as current grid-connected current operation angle;

3. in case the operation angle that calculates surpasses 360 °, will calculate angle and deduct 360 ° as current grid-connected current operation angle;

4. look into triangular modulation wave table lattice according to current operation angle, take out data and deposit temporary register T in _Temp, with T _Temp, M multiplies each other and obtains current operation pulse duration M ';

5. according to the high-frequency inverter carrier frequency, get carrier cycle T _SMultiply each other with M ', result of calculation is sent into the single-chip microcomputer comparand register;

6. by Single Chip Microcomputer (SCM) PWM pulse generation unit production burst signal;

7. the pulse number counter adds 1, judges the parity of pulse counter, if odd number is controlled Single Chip Microcomputer (SCM) PWM pulse generation unit, forces to turn-off V ₂Switching tube, and make V ₁The switching tube conducting.If even number forces to turn-off V ₁Switching tube, and make V ₂The switching tube conducting;

8. recover on-the-spot, return.

Its single phase industrial frequence inverter pulse generates subprogram as shown in figure 13, mainly finishes the single phase industrial frequence inverter and drives the signal generation.

1. keep the scene intact,

2. judge whether line voltage is positive half cycle:

If positive half cycle turn-offs V _R2Switching tube, and make V _R1The switching tube conducting;

If not positive half cycle (being negative half period) turn-offs V _R1Switching tube, and make V _R2The switching tube conducting;

3. recover on-the-spot,

4. return.

Figure 14, Figure 15, Figure 16 illustrate three-phase grid system single-chip microcomputer 12 specific algorithm flow charts.Single-chip microcomputer 12 at first carries out parameter initialization after powering on and moving, and inquires about the instruction of being incorporated into the power networks then, in case receive the instruction of being incorporated into the power networks, single-chip microcomputer 12 is carried out high-frequency PWM pulse generators, carries out the high-frequency inversion operation.

Figure 14 is a three-phase pulse counting subroutine FB(flow block).

(1) voltage sensor 14 detected direct voltage E _d9 detected grid-connected current i are input to single-chip microcomputer 12 with current sensor;

(2) single-chip microcomputer 12 calculates the electric current I that can output to electrical network according to formula (4) _G

(3) I _GThe and instruction current i ^*Relatively, in case instruction current surpasses the maximum grid-connected current I that inverter 2 can be exported _G, 2 output of inverter maximum current I _G, and by the single-chip microcomputer 12 alarms value of reaching capacity.Instruction current i ^*The grid-connected current i that arrives with actual detected relatively, when instruction current greater than actual current i, then increase output current by increasing modulation depth M, promptly M increases Δ M; If instruction current less than actual current i, then reduces output current by reducing modulation depth M, promptly M reduces Δ M.Adjusted modulation depth M is compared with maximum, irreducible minimum amplitude; If surpass amplitude limit value, maximum or irreducible minimum amplitude sent into modulation depth M; Call the high-frequency inverter pulse then and generate subprogram; If do not surpass amplitude limit value, directly call the high-frequency inverter pulse and generate subprogram;

(4) call the pulse of three-phase high-frequency inverter and generate subprogram;

(5) call the pulse of three-phase main-frequency inverter and generate subprogram;

(6) return.

Its three-phase high-frequency inverter pulse generates subprogram as shown in figure 15, mainly finishes calculating of three-phase high-frequency inverter pulse duration and drive signal and generates.

Be carved into current time grid-connected current operation angle difference Δ θ when (1) calling according to the last secondary program of line voltage frequency computation part;

(2) with last time grid-connected current operation angle θ add that differential seat angle Δ θ is as current grid-connected current operation angle; In case the operation angle that calculates surpasses 360 °, will calculate angle and deduct 360 ° as current grid-connected current operation angle; Deposit current operation angle in register θ then _RIn;

(3) current operation angle is added 120 ° as current operation angle; In case the operation angle that calculates surpasses 360 °, will calculate angle and deduct 360 ° as current operation angle; Deposit current operation angle in register θ then _SIn;

(4) current operation angle is added 120 ° as current operation angle; In case the operation angle that calculates surpasses 360 °, will calculate angle and deduct 360 ° as current operation angle; Deposit current operation angle in register θ then _TIn;

(5) according to θ _RAngle is looked into triangular modulation wave table lattice, takes out data and deposits temporary register T in _Temp, with T _Temp, M multiplies each other and obtains R phase pulse duration M ';

(6), get carrier cycle T according to the high-frequency inverter carrier frequency _SMultiply each other with M ', result of calculation is sent in the single-chip microcomputer comparand register 1; Generate the R phase pulse signal by Single Chip Microcomputer (SCM) PWM pulse generation unit;

(7) according to θ _SAngle is looked into triangular modulation wave table lattice, takes out data and deposits temporary register T in _Temp, with T _Temp, M multiplies each other and obtains S phase pulse duration M ';

(8), get carrier cycle T according to the high-frequency inverter carrier frequency _SMultiply each other with M ', result of calculation is sent in the single-chip microcomputer comparand register 2; Generate the S phase pulse signal by Single Chip Microcomputer (SCM) PWM pulse generation unit;

(9) according to θ _TAngle is looked into triangular modulation wave table lattice, takes out data and deposits temporary register T in _Temp, with T _Temp, M multiplies each other and obtains T phase pulse duration M ';

(10), get carrier cycle T according to the high-frequency inverter carrier frequency _SMultiply each other with M ', result of calculation is sent in the single-chip microcomputer comparand register 3; Generate the T phase pulse signal by Single Chip Microcomputer (SCM) PWM pulse generation unit;

(11) the pulse number counter adds 1, judges the parity of pulse counter, if odd number is controlled Single Chip Microcomputer (SCM) PWM pulse generation unit, turn-offs V ₂, V ₄, V ₆Switching tube, and make V ₁, V ₃, V ₅The switching tube conducting.If even number turn-offs V ₁, V ₃, V ₅Switching tube, and make V ₂, V ₄, V ₆The switching tube conducting;

(12) recover on-the-spot, return.

Its three-phase main-frequency inverter pulse generates subprogram as shown in figure 16, mainly finishes the three-phase main-frequency inverter and drives the signal generation.

(1) judges whether rising edge of the R phase zero passage signal of telecommunication that captured last time: if rising edge jumps to step (2); Otherwise (being to capture trailing edge last time) jumps to step (5);

(2) judge whether to catch R phase zero passage electricity trailing edge signal: if jump to step (8); Otherwise, jump to step (3);

(3) judge whether to catch last time the rising edge signal and just be 60 °: if jump to step (9) to current interval; Otherwise, jump to step (4);

(4) judge whether to catch last time the rising edge signal and just be 120 °: if jump to step (10) to current interval; Otherwise, recover on-the-spot, return.

(5) judge whether to catch R phase zero passage electricity rising edge signal: if jump to step (11); Otherwise, jump to step (6);

(6) judge whether to catch last time the trailing edge signal and just be 60 °: if jump to step (12) to current interval; Otherwise, jump to step (7);

(7) judge whether to catch last time the trailing edge signal and just be 120 °: if jump to step (13) to current interval; Otherwise, recover on-the-spot, return.

(8) V _R1Switching tube turn-offs, V _R2The switching tube conducting, the recovery scene is returned then.

(9) V _T1Switching tube turn-offs, V _T2The switching tube conducting, the recovery scene is returned then.

(10) V _S2Switching tube turn-offs, V _S1The switching tube conducting, the recovery scene is returned then.

(11) V _R2Switching tube turn-offs, V _R1The switching tube conducting, the recovery scene is returned then.

(12) V _T2Switching tube turn-offs, V _T1The switching tube conducting, the recovery scene is returned then.

(13) V _S1Switching tube turn-offs, V _S2The switching tube conducting, the recovery scene is returned then.

Experimental result for example

The experiment current waveform of immittance converter output when Figure 17 illustrates triangular wave-triangular modulation, and Figure 18 shows the experimental waveform of distributed grid-connected system grid-connected current and line voltage.As can be seen, immittance converter output current envelope is sinusoidal wave among Figure 17, and grid-connected current has sinusoidal preferably degree among Figure 18, and harmonic current content is few, the power factor height.

Table 1

Claims (6)

1. high efficiency single-phase and three-phase grid-connected generating system, be made up of high-frequency inverter (2), immittance converter (3), high frequency transformer (4), hf rectifier (5), power frequency inverter (6) and low pass filter (7), it is characterized in that the structure that described high-frequency inverter (2) is used for single phase system is: the positive pole of photovoltaic battery array (1) is connected to a power transistor V ₁Collector electrode promptly drain and a capacitor C _D1A _Cd1End, the negative pole of photovoltaic battery array (1) is connected to a power transistor V ₂Emitter be source electrode and a capacitor C _D2B _Cd2End, power transistor V ₁Emitter be that source electrode is connected to power transistor V ₂Collector electrode promptly drain and output to an input of described immittance converter (3), capacitor C _D1B _Cd1End is connected to capacitor C _D2A _Cd2Hold and output to another input of described immittance converter (3); The structure that high-frequency inverter (2) is used for three-phase system is: the positive pole of photovoltaic battery array (1) is connected to three power transistor V ₁, V ₃, V ₅Collector electrode promptly drain and a capacitor C _D1A _Cd1End, the negative pole of photovoltaic battery array (1) is connected to three power transistor V ₂, V ₄, V ₆Emitter be source electrode and a capacitor C _D2B _Cd2End, power transistor V ₁Emitter be that source electrode is connected to power transistor V ₄Collector electrode promptly drain and output to an input of described immittance converter (3) R phase, power transistor V ₃Emitter be that source electrode is connected to power transistor V ₆Collector electrode promptly drain and output to an input of described immittance converter (3) S phase, power transistor V ₅Emitter be that source electrode is connected to power transistor V ₂Collector electrode promptly drain and output to an input of described immittance converter (3) T phase, capacitor C _D1B _Cd1End is connected to capacitor C _D2A _Cd2Hold and output to a public input O of described immittance converter (3).

2. follow according to described high efficiency single-phase of claim 1 and three-phase grid-connected generating system, it is characterized in that the structure that described immittance converter (3) is used for single phase system is: an output of described high-frequency inverter (2) is connected to an inductance L _R1A _LR1End, another output is connected to a capacitor C _RB _CREnd, inductance L _R1B _LR1End, capacitor C _RA _CREnd and inductance L _R2A _LR2End links together, inductance L _R2B _LR2End outputs to an input of described high frequency transformer (4), capacitor C _RB _CREnd outputs to another input of described high frequency transformer (4); The structure that immittance converter (3) is used for three-phase system is: an inductance L _R1, another inductance L _R2With a capacitor C _RForm R phase immittance converter, the R phase output terminal of described high-frequency inverter (2) is connected to inductance L _R1A _LR1End, the public output O of described high-frequency inverter (2) is connected to capacitor C _RB _CREnd, inductance L _R1B _LR1End, capacitor C _RA _CREnd and inductance L _R2A _LR2End links together, inductance L _R2B _LR2End outputs to TR in the described high frequency transformer (4) _RInput of transformer, capacitor C _RB _CREnd outputs to TR in the described high frequency transformer (4) _RAnother input of transformer; An inductance L _S1, another inductance L _S2With a capacitor C _SForm S phase immittance converter, the S phase output terminal of described high-frequency inverter (2) is connected to inductance L _S1A _LS1End, the public output O of described high-frequency inverter (2) is connected to capacitor C _SB _CSEnd, inductance L _S1B _LS1End, capacitor C _SA _CSEnd and inductance L _S2A _LS2End links together, inductance L _S2B _LS2End outputs to TR in the described high frequency transformer (4) _SInput of transformer, capacitor C _SB _CSEnd outputs to TR in the described high frequency transformer (4) _SAnother input of transformer; An inductance L _T1, another inductance L _T2With a capacitor C _TForm T phase immittance converter, the T phase output terminal of described high-frequency inverter (2) is connected to inductance L _T1A _LT1End, the public output O of described high-frequency inverter (2) is connected to capacitor C _TB _CTEnd, inductance L _T1B _LT1End, capacitor C _TA _CTEnd and inductance L _T2A _LT2End links together, inductance L _T2B _LT2End outputs to TR in the described high frequency transformer (4) _TInput of transformer, capacitor C _TB _CTEnd outputs to TR in the described high frequency transformer (4) _TAnother input of transformer;

3. follow according to described high efficiency single-phase of claim 1 and three-phase grid-connected generating system, it is characterized in that the structure that described high frequency transformer (4) is used for single phase system is: inductance L in the described immittance converter (3) _R2B _LR2End is input to a of high frequency transformer _TRRCapacitor C in the end, immittance converter (3) _RB _CREnd is input to the b of high frequency transformer _TRREnd, the c of high frequency transformer _TRREnd outputs to an input of described hf rectifier (5), the e of high frequency transformer _TRREnd outputs to another input of described hf rectifier (5), the d of high frequency transformer _TRREnd outputs to an input of described low pass filter (7); The structure that high frequency transformer (4) is used for three-phase system is: inductance L in the described immittance converter (3) _R2B _LR2End is input to TR _RThe a of high frequency transformer _TRRCapacitor C in the end, immittance converter (3) _RB _CREnd is input to TR _RThe b of high frequency transformer _TRREnd, TR _RThe c of high frequency transformer _TRREnd outputs to an input, the TR of described hf rectifier (5) R phase _RThe e of high frequency transformer _TRREnd outputs to another input of described hf rectifier (5) R phase, TR _RThe d of high frequency transformer _TRREnd outputs to an input of described low pass filter (7) R phase; Inductance L in the described immittance converter (3) _S2B _LS2End is input to TR _SThe a of high frequency transformer _TRSCapacitor C in the end, immittance converter (3) _SB _CSEnd is input to TR _SThe b of high frequency transformer _TRSEnd, TR _SThe c of high frequency transformer _TRSEnd outputs to an input, the TR of described hf rectifier (5) S phase _SThe e of high frequency transformer _TRSEnd outputs to another input of described hf rectifier (5) S phase, TR _SThe d of high frequency transformer _TRSEnd outputs to an input of described low pass filter (7) S phase; Inductance L in the described immittance converter (3) _T2B _LT2End is input to TR _TThe a of high frequency transformer _TRTCapacitor C in the end, immittance converter (3) _TB _CTEnd is input to TR _TThe b of high frequency transformer _TRTEnd, TR _TThe c of high frequency transformer _TRTEnd outputs to an input, the TR of described hf rectifier (5) T phase _TThe e of high frequency transformer _TRTEnd outputs to another input of described hf rectifier (5) T phase, TR _TThe d of high frequency transformer _TRTEnd outputs to an input of described low pass filter (7) T phase.

4. follow according to described high efficiency single-phase of claim 1 and three-phase grid-connected generating system, it is characterized in that the structure that described hf rectifier (5) is used for single phase system is: an output c of described high frequency transformer (4) _TRRBe connected to a diode VD _R1Anode and another diode VD _R2Negative electrode, another output e _TRRBe connected to a diode VD _R3Anode and another diode VD _R4Negative electrode, diode VD _R1Negative electrode and diode VD _R3Negative electrode link together and output to an input of described power frequency inverter (6), diode VD _R2Anode and diode VD _R4Anode link together and output to another input of described power frequency inverter (6); The structure that hf rectifier (5) is used for three-phase system is: described high frequency transformer (4) TR _RAn output c _TRRBe connected to a diode VD _R1Anode and another diode VD _R2Negative electrode, another output e _TRRBe connected to a diode VD _R3Anode and another diode VD _R4Negative electrode, diode VD _R1Negative electrode and diode VD _R3Negative electrode link together and output to an input of described power frequency inverter (6) R phase, diode VD _R2Anode and diode VD _R4Anode link together and output to another input of described power frequency inverter (6) R phase; Described high frequency transformer (4) TR _SAn output c _TRSBe connected to a diode VD _S1Anode and another diode VD _S2Negative electrode, another output e _TRSBe connected to diode VD _S3Anode and diode VD _S4Negative electrode, diode VD _S1Negative electrode and diode VD _S3Negative electrode link together and output to an input of described power frequency inverter (6) S phase, diode VD _S2Anode and diode VD _S4Anode link together and output to another input of described power frequency inverter (6) S phase; Described high frequency transformer (4) TR _TAn output c _TRTBe connected to diode VD _T1Anode and diode VD _T2Negative electrode, another output e _TRTBe connected to diode VD _T3Anode and diode VD _T4Negative electrode, diode VD _T1Negative electrode and diode VD _T3Negative electrode link together and output to an input of described power frequency inverter (6) T phase, diode VD _T2Anode and diode VD _T4Anode link together and output to another input of described power frequency inverter (6) T phase.

5. follow according to described high efficiency single-phase of claim 1 and three-phase grid-connected generating system, it is characterized in that the structure that described power frequency inverter (6) is used for single phase system is: diode VD in the described hf rectifier (5) _R1Negative electrode and diode VD _R3Negative electrode output to a power transistor V _R1Collector electrode promptly drain or anode diode VD in the hf rectifier (5) _R2Anode and diode VD _R4Anode output to another power transistor V _R2Emitter be source electrode or anode, power transistor V _R1Emitter be that source electrode or anode are connected to power transistor V _R2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter (7); The structure that power frequency inverter (6) is used for three-phase system is: diode VD in the described hf rectifier (5) _R1Negative electrode and diode VD _R3Negative electrode output to a power transistor V _R1Collector electrode promptly drain or anode diode VD in the hf rectifier (5) _R2Anode and diode VD _R4Anode output to another power transistor V _R2Emitter be source electrode or anode, power transistor V _R1Emitter be that source electrode or anode are connected to power transistor V _R2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter (7) R phase; Diode VD in the described hf rectifier (5) _S1Negative electrode and diode VD _S3Negative electrode output to a power transistor V _S1Collector electrode promptly drain or anode diode VD in the hf rectifier (5) _S2Anode and diode VD _S4Anode output to another power transistor V _S2Emitter be source electrode or anode, power transistor V _S1Emitter be that source electrode or anode are connected to power transistor V _S2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter (7) S phase; Diode VD in the described hf rectifier (5) _T1Negative electrode and diode VD _T3Negative electrode output to a power transistor V _T1Collector electrode promptly drain or anode diode VD in the hf rectifier (5) _T2Anode and diode VD _T4Anode output to another power transistor V _T2Emitter be source electrode or anode, power transistor V _T1Emitter be that source electrode or anode are connected to power transistor V _T2I.e. drain electrode of collector electrode or anode and output to an input of described low pass filter (7) T phase.

6. follow according in described high efficiency single-phase of claim 1 and the three-phase grid-connected generating system, it is characterized in that the structure that described low pass filter (7) is used for single phase system is: the output of described power frequency inverter (6) is connected to a capacitor C _R1A _CR1End and an inductance L _R1A _LR1End, an output d of described high frequency transformer (4) _TRRBe connected to capacitor C _R1B _CR1End, inductance L _R1B _R1End outputs to an input of described electrical network (8), capacitor C _R1B _R1End outputs to another input of described electrical network (8); The structure that low pass filter (7) is used for three-phase system is: the R phase output terminal of described power frequency inverter (6) is connected to a capacitor C _R1A _CR1End and an inductance L _R1A _LR1End, described high frequency transformer (4) TR _RAn output d _TRRBe connected to capacitor C _R1B _CR1End, inductance L _R1B _R1End outputs to the R phase input of described electrical network (8); The S phase output terminal of described power frequency inverter (6) is connected to a capacitor C _S1A _CS1End and an inductance L _S1A _LS1End, described high frequency transformer (4) TR _SAn output d _TRSBe connected to capacitor C _S1B _CS1End, inductance L _S1B _S1End outputs to the S phase input of described electrical network (8); The T phase output terminal of described power frequency inverter (6) is connected to a capacitor C _T1A _CT1End and an inductance L _T1A _LT1End, described high frequency transformer (4) TR _TAn output d _TRTBe connected to capacitor C _T1B _CT1End, inductance L _T1B _T1End outputs to the T phase input of described electrical network (8).Capacitor C _R1B _CR1End, capacitor C _S1B _CS1End and capacitor C _T1B _CT1End links together.

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