TWI651920B - Renewable energy supply system - Google Patents

Abstract

A renewable energy power supply system includes a DC power module, a conversion device, and a control device, wherein the DC power module includes a renewable energy power generation component and a battery; the conversion device includes a switching circuit, a ripple suppression circuit, A high-frequency transformer, a converter circuit, and a switching circuit. The ripple suppression circuit provides a path for ripple transmission. The conversion device is controlled by the control device in a first or a second conversion mode. In the first conversion mode, The DC power output from the DC power module is transmitted to the high-frequency transformer, and then converted to AC power to the load through the converter circuit; in the second conversion mode, the AC power is transmitted to the high-frequency transformer, and the switching circuit is converted to DC power to the battery. . This can suppress double-frequency ripples and improve system performance.

Description

Renewable energy power supply system

The invention relates to an AC power system; in particular, it relates to a renewable energy power supply system capable of suppressing double-frequency ripples.

It is known that single-phase AC power systems are widely used in low-power applications. Generally, single-phase AC power systems use a DC-AC converter to convert DC power to single-phase AC power output.

When the DC-AC converter generates instantaneous double-frequency power at the double frequency, the law of conservation of energy (Law of Conservation of Energy) is reflected to the input side to form a double-frequency ripple power (Ripple Power at Twice The Grid Frequency), which affects the performance of AC power systems. For example, for a solar power system using single-phase AC power, this double-frequency ripple power will cause the Maximum Power Point Tracking to fluctuate, thereby reducing the performance of the solar power system.

In order to reduce the double-frequency ripple, the traditional solution is to place an electrolytic capacitor with a large capacitance value on the input side to absorb the double-frequency ripple power and high-frequency noise. However, the large-capacity electrolytic capacitor Capacitors are accompanied by problems of their large size and longevity of the capacitors, leading to a decrease in the reliability of the AC power system.

In view of this, the object of the present invention is to provide a renewable energy power supply system, which can reduce double frequency ripples and improve the performance of the power supply system.

In order to achieve the above object, the present invention provides a renewable energy power supply system for supplying power to at least one load. The renewable energy power supply system includes a DC power module, a conversion device, and a control device. The DC power module The group includes a renewable energy power generation component and a battery connected in parallel. The DC power module is used to output or receive DC power to the battery. The conversion device includes a switching circuit, a ripple suppression circuit, and a high-frequency transformer. A converter circuit and a switching circuit, wherein the high-frequency transformer includes a primary side and a secondary side, wherein the primary side has a first port, and the switching circuit is electrically connected to the DC power module, The ripple suppression circuit and the first port on the primary side of the high-frequency transformer, and the ripple suppression circuit is used to provide a path for ripple transmission to suppress double-frequency ripple; the secondary side has a second port And a third port, the converter circuit is electrically connected to the second port and the load, and the switch circuit is electrically connected to the third port and an AC power source; Is controlled to operate in one of a first conversion mode and a second conversion mode, wherein: in the first conversion mode, the switching circuit is controlled to transmit the DC power output by the DC power module The first port of the high-frequency transformer is converted to AC power and output to a load through the second port of the high-frequency transformer and the converter circuit. In the second conversion mode, the switching circuit is controlled to switch the AC power. The electric energy is transmitted to the third port of the high-frequency transformer, and the output is transmitted through the first port of the high-frequency transformer. The switching circuit is controlled to convert the electric energy output from the first port of the high-frequency transformer to DC power. Transmitted to the battery; the control device is electrically connected to the conversion device, and is used for controlling the conversion device to operate in the first conversion mode or the second conversion mode.

The renewable energy power supply system includes an input capacitor, two ends of which are electrically connected to a positive electrical terminal and a negative electrical terminal of the DC power module, and the input capacitor is a non-electrolytic capacitor, such as a film capacitor.

The effect of the present invention is that by providing a ripple transmission path through the ripple suppression circuit of the conversion device, double-frequency ripples can be suppressed and the performance of the renewable energy power supply system can be effectively improved. In addition, after double-frequency ripple is suppressed, non-electrolytic capacitors can be used as input capacitors to improve the problem of reducing the reliability of renewable energy power supply systems caused by electrolytic capacitors.

〔this invention〕

10‧‧‧DC Power Module

10a‧‧‧Positive terminal

10b‧‧‧ negative terminal

12‧‧‧ solar panels

D‧‧‧ Diode

14‧‧‧ Battery

20‧‧‧ Conversion device

Cin‧‧‧input capacitor

22‧‧‧switching circuit

S1‧‧‧First transistor

S2‧‧‧Second transistor

S3‧‧‧Third transistor

S4‧‧‧Fourth transistor

S5‧‧‧Fifth transistor

S6‧‧‧Sixth transistor

S7‧‧‧Seventh transistor

S8‧‧‧Eight transistor

24‧‧‧Ripple suppression circuit

Cr‧‧‧filter capacitor

Lr‧‧‧filter inductor

26‧‧‧High-frequency transformer

28‧‧‧ primary side

282‧‧‧First port

Np‧‧‧coil

Lm‧‧‧ Excitation Inductance

30‧‧‧ secondary side

302‧‧‧Second Port

Ns1‧‧‧coil

Ns2‧‧‧coil

302a‧‧‧First end

302b‧‧‧ second end

302c‧‧‧ third end

304‧‧‧Third Port

Nt‧‧‧coil

32‧‧‧ converter circuit

S9‧‧‧Ninth transistor

S10‧‧‧Tenth transistor

S11‧‧‧Eleventh transistor

S12‧‧‧Twelfth transistor

C1‧‧‧ output capacitor

C2‧‧‧ output capacitor

34‧‧‧Switch circuit

S13‧‧‧Thirteenth transistor

S14‧‧‧Fourteenth transistor

36‧‧‧Control device

AC‧‧‧AC Power

L‧‧‧Inductance

C3‧‧‧ output capacitor

101‧‧‧first load

102‧‧‧second load

Vac, Vdc, Vcr, Vo1, Vo2‧‧‧ Voltage

iac, idc, ilr, io1, io2‧‧‧Current

FIG. 1 is a circuit diagram of a renewable energy power supply system according to a preferred embodiment of the present invention.

FIG. 2 and FIG. 3 are schematic diagrams when the conversion device operates the first conversion mode and is in a positive half-cycle state.

4 and 5 are schematic diagrams when the conversion device operates the first conversion mode and is in a negative half cycle state.

FIG. 6 and FIG. 7 are schematic diagrams when the conversion device operates the second conversion mode and is in a positive half cycle.

8 and 9 are schematic diagrams when the conversion device operates the second conversion mode and is in a negative half cycle.

FIG. 10 is a waveform diagram of the conversion device operating in the first conversion mode.

FIG. 11 is a waveform diagram of the conversion device without a ripple suppression circuit and operating in a first conversion mode.

FIG. 12 is a waveform diagram of the conversion device operating in the second conversion mode.

FIG. 13 is a waveform diagram of the conversion device without a ripple suppression circuit and operating in the second conversion mode.

In order to explain the present invention more clearly, preferred embodiments are described in detail below with reference to the drawings. Please refer to FIG. 1, which is a renewable energy power supply system according to a preferred embodiment of the present invention for supplying power to the first load 101 and the second load 102. The number of the aforementioned loads may be at least one. The renewable energy power supply system includes a DC power module 10, a conversion device 20, and a control device 36. The DC power module 10 has a positive electrical terminal 10a and a negative electrical terminal 10b, and includes a The solar panel 12 is an example of a renewable energy power generation component and a battery 14. The anode of the solar panel 12 is connected to a diode D. The battery 14 is connected in parallel to the solar panel 12 and the diode D. The DC power module 10 outputs DC power from the positive power terminal 10 a and the negative power terminal 10 b, or receives DC power to the battery 14 to charge the battery 14.

The conversion device 20 includes an input capacitor Cin, a switching circuit 22, a ripple suppression circuit 24, a high-frequency transformer 26, a converter circuit 32, and a switching circuit 34. The two ends of the input capacitor Cin are respectively connected to the The positive electrical terminal 10a and the negative electrical terminal 10b. The input capacitor Cin may be an electrolytic capacitor or a non-electrolytic capacitor. The switching circuit 22 is electrically connected to the DC power module 10 and the ripple suppression circuit 24. The ripple suppression circuit 24 is used to provide a path for ripple transmission to suppress double-frequency ripple.

The high-frequency transformer 26 includes a primary side 28 and a secondary side 30. The primary side 28 has a first port 282. The secondary side 30 has a second port 302 and a third port 304. In this embodiment, the first port 282 includes a coil Np and a magnetizing inductance Lm connected in parallel. The second port 302 includes two serial ports. The coils Ns1, Ns2, where the unconnected ends of the coils Ns1, Ns2 are the first end 302a and the second end 302b, respectively, and the two coils Ns1, Ns2 are connected to each other. The terminal is the third terminal 302c. The first port 282 of the primary side 28 of the high-frequency transformer 26 is electrically connected to the switching circuit.

The converter circuit 32 is electrically connected to the second port 302 of the high-frequency transformer 26 and the first load 101 and the second load 102. In this embodiment, the input side of the converter circuit 32 is electrically connected to one of the secondary sides 30. The first end 302a, the second end 302b, and the third end 302c of the second port 302 are electrically connected to the first and second loads 101 and 102. The output side of the converter circuit 32 is for outputting single-phase three-wire AC power. First and second loads 101, 102. In practice, a single-phase two-wire AC power converter circuit can also be used. The input side of the converter circuit is directly connected to both ends of the second port to output single-phase two-wire AC power to a load.

The conversion device 20 is controlled to operate in one of a first conversion mode (ie, a converter mode) and a second conversion mode (ie, a rectifier mode), where: in the first conversion mode, the switching The circuit 22 is controlled to transmit the DC power output by the DC power module 10 to the first port 282 of the high-frequency transformer 26, and then converts the second port 302 of the high-frequency transformer 26 and the converter circuit 32 into The AC power is output to the first and second loads 101, 102.

In the second conversion mode, the switching circuit 34 is controlled to transmit the electrical energy of the AC power source AC to the third port of the high-frequency transformer 26 and pass through the first port 282 of the primary side 28 of the high-frequency transformer 26 Output, the switching circuit 22 is controlled to convert the electric energy output from the first port 282 of the primary side 28 of the high-frequency transformer 26 to DC power and transmit the power to the battery 14 to charge the battery 14.

The control device 36 is electrically connected to the conversion device 20 to control the conversion device 20 to operate in the first conversion mode or the second conversion mode.

The detailed structure of the conversion device 20 of this embodiment is described later: The switching circuit 22 includes a first transistor S1, a second transistor S2, a third transistor S3, a fourth transistor S4, a fifth transistor S5, a sixth transistor S6, and a seventh transistor. The transistor S7 and an eighth transistor S8, wherein the transistors S1 to S8 each have a first end and a second end. In addition, the transistors S1 to S8 are controlled by the control device 36 to turn on or off between the first terminal and the second terminal.

The first terminal of the first transistor S1 and the first terminal of the second transistor S2 are electrically connected to the positive terminal 10a of the DC power module 10; the second terminal of the third transistor S3 and the fourth terminal The second terminal of the transistor S4 is electrically connected to the negative terminal 10b of the DC power module 10; the first terminal of the fifth transistor S5 is electrically connected to the first terminal of the third transistor S3 and the seventh transistor. The first terminal of S7, the second terminal of the fifth transistor S5 is electrically connected to the second terminal of the first transistor S1, and the first terminal of the sixth transistor S6 is electrically connected to the fourth transistor S4. The first terminal and the first terminal of the eighth transistor S8; the second terminal of the sixth transistor S6 is electrically connected to the second terminal of the second transistor S2; and the second terminal of the seventh transistor S7 is electrically connected. The second terminal of the eighth transistor S8 is sexually connected. Both ends of the first port 282 of the primary side 28 of the high-frequency transformer 26 are electrically connected to the second terminal of the first transistor S1 and the second terminal of the second transistor S2, respectively.

The ripple suppression circuit 24 includes a filter capacitor Cr and a filter inductor Lr connected in series, one end of the filter capacitor Cr is connected to one end of the filter inductor Lr, and the other end of the filter capacitor Cr is electrically connected to the eighth capacitor. The first end of the crystal S8, the other end of the filter inductor Lr is electrically connected to the first end of the seventh transistor S7.

The converter circuit 32 includes a ninth transistor S9, a tenth transistor S10, an eleventh transistor S11, a twelfth transistor S12, and two output capacitors C1, C2, among which the ninth transistor S9 to the twelfth transistor S12 each have a first end and a second end, and the ninth transistor S9 to the twelfth transistor S12 are each controlled by the control device 36 to make the respective first The terminal and the second terminal are turned on or off. The first terminal of the ninth transistor S9 is electrically Connected to the first end 302a of the second port 302; the second end of the ninth transistor S9 is electrically connected to the second end of the tenth transistor S10, and the first end of the tenth transistor S10 is electrically connected to the One end of the first load 101, the other end of the first load 101 is connected to one end of the second load 102 and the third end 302c; the first end of the eleventh transistor S11 is electrically connected to the second port The second end 302b of the 302; the second end of the eleventh transistor S11 is electrically connected to the second end of the twelfth transistor S12, and the first end of the twelfth transistor S12 is electrically connected to the second The other end of the load 102.

The two output capacitors C1 and C2 are connected in parallel with the first and second loads 101 and 102, respectively. In practice, if the load connected to the converter circuit 32 has only one load and both ends of the load are respectively connected to the first terminal of the tenth transistor S10 and the first terminal of the twelfth transistor S12, one can be used. The equivalent output capacitor is connected in parallel to the one load, and the equivalent output capacitor is not connected to the third terminal 302c.

The third port 304 of the secondary side 30 of the high-frequency transformer 26 is electrically connected to the alternating current power source AC through the switching circuit 34. The switch circuit 34 is electrically connected to the control device 36 and is controlled by the control device 36 to be turned on or off. The switching circuit 34 includes a thirteenth transistor S13 and a fourteenth transistor S14 (ie, a first switching transistor and a second switching transistor as defined in the present invention), wherein the thirteenth transistor S13 and The fourteenth transistor S14 has a first end and a second end, respectively, and the thirteenth transistor S13 and the fourteenth transistor S14 are controlled by the control device 36 so that the respective first ends and The second terminal is turned on or off. The first terminal of the thirteenth transistor S13 is electrically connected to one end of the third port 304 of the secondary side 30, and the second terminal of the thirteenth transistor S13 is electrically connected to the first terminal of the fourteenth transistor S14. Both ends.

The AC power source AC is connected in series with an inductor L and then in parallel with an output capacitor C3. And one end of the AC power source AC is electrically connected to the first end of the fourteenth transistor S14 through the inductor L, and the other end of the AC power source AC is electrically connected to the other end of the third port.

In this embodiment, the first transistor S1 to the fourteenth transistor S14 are power n-channel MOSFETs, and the first terminals of the first transistor S1 to the fourteenth transistor S14 are drain electrodes, respectively. A second terminal of each of the transistor S1 to the fourteenth transistor S14 is a source, and each of the first transistor S1 to the fourteenth transistor S14 has a diode, and the anode is connected to the respective source. Its cathode is connected to its respective drain.

When the control device 36 controls the conversion device 20 to operate in the first conversion mode, the control device 36 controls the switch circuit 34 to be turned off and divided into a positive half-cycle state and a negative half-cycle state to control the switching circuit 22 respectively. The first transistor S1 to the eighth transistor S8 cause the converter circuit 32 to output a positive half-cycle waveform and a negative half-cycle waveform of the alternating current, respectively, wherein: in the positive half-cycle state, the control device 36 controls the switching circuit The first transistor S1 to the eighth transistor S8 of 22 are alternately switched between a first converter configuration (refer to FIG. 2) and a second converter configuration (refer to FIG. 3). In this embodiment, when the control device controls the transistors S1 to S8 of the switching circuit to be the first converter configuration, the control device further includes the ninth transistor S9, which enables the converter circuit 32, The twelfth transistor S12 is turned on, the tenth transistor S10 and the eleventh transistor S11 are turned off; the control device 36 controls the transistors S1 to S8 of the switching circuit 22 to be the second converter group In the state, the control device further includes turning on the ninth transistor S9, the tenth transistor S10, the eleventh transistor S11, and the twelfth transistor S12 of the converter circuit 32.

Please refer to FIG. 2. The first converter is configured as the first transistor S1, the fourth transistor S4, the fifth transistor S5, the sixth transistor S6, and the second transistor S2. The third transistor S3, the seventh transistor S7, and the eighth transistor S8 are turned off to store energy in the magnetizing inductance of the first port 282. In addition, the DC power output by the DC power module 10 The ripple transmission path provided by the filter capacitor Cr and the filter inductor Lr is used to suppress the double-frequency ripple. The output capacitors C1 and C2 discharge the first and second loads 101 and 102.

Please refer to FIG. 3, the second converter is configured such that the seventh transistor S7 and the eighth transistor S8 are turned on, and the first transistor S1, the second transistor S2, the third transistor S3, The fourth transistor S4, the fifth transistor S5, and the sixth transistor S6 are turned off, so that the excitation inductance Lm is discharged to the second port 302 of the secondary side 30 of the high-frequency transformer 26. The two output capacitors C1 and C2 are charged and the first and second loads 101 and 102 are discharged. In addition, the filter capacitor Cr and the filter inductor Lr and the seventh transistor S7 and the eighth transistor S8 also form a ripple transmission path to suppress double-frequency ripple.

In the negative half cycle state, the control device 36 controls the first transistor S1 to the eighth transistor S8 of the switching circuit 22 alternately in a third inverter configuration (refer to FIG. 4) and a fourth inverter. Stream configuration (refer to Figure 5) is switched. In this embodiment, when the control device 36 controls the transistors S1 to S8 of the switching circuit 22 for the third converter configuration, the control device 36 further includes the tenth power for the converter circuit 32. The crystal S10 and the eleventh transistor S11 are turned on, the ninth transistor S9 and the twelfth transistor S12 are turned off; the control device 36 controls the transistors S1 to S8 of the switching circuit 22 to be the fourth In the converter configuration, the control device 36 further includes turning on the ninth transistor S9, the tenth transistor S10, the eleventh transistor S11, and the twelfth transistor S12 of the converter circuit 32.

Please refer to FIG. 4. The third converter is configured as the second transistor S2, the third transistor S3, the fifth transistor S5, the sixth transistor S6, and the first transistor S1. The fourth transistor S4, the seventh transistor S7, and the eighth transistor S8 are turned off to store energy in the excitation inductance Lm. In addition, the DC power output by the DC power module 10 is transmitted through a ripple path provided by the filter capacitor Cr and the filter inductor Lr to suppress double-frequency ripple. When the direction of the current flowing through the field inductor Lm, the filter capacitor Cr and the filter inductor Lr is the same as that of the first converter configuration The current flows in the opposite direction. In addition, the output capacitors C1, C2 discharge the first and second loads 101, 102, and the discharge direction is opposite to the discharge direction in the first converter configuration.

Please refer to FIG. 5. The fourth converter is configured such that the seventh transistor S7 and the eighth transistor S8 are turned on, and the first transistor S1, the second transistor S2, the third transistor S3, The fourth transistor S4, the fifth transistor S5, and the sixth transistor S6 are turned off, so that the excitation inductance Lm is discharged to the second port 302 of the secondary side 30 of the high-frequency transformer 26, so that The two output capacitors C1, C2 are charged and the loads 101, 102 are discharged, and the discharge direction is opposite to that in the second converter configuration. In addition, the filter capacitor Cr and the filter inductor Lr and the seventh transistor S7 and the eighth transistor S8 also form a ripple transmission path to suppress double-frequency ripple. The direction of the current flowing through the field inductor Lm, the filter capacitor Cr and the filter inductor Lr is opposite to the direction of the current in the second variable current configuration.

When the control device 36 controls the conversion device 20 to operate in the second conversion mode, the control device 36 controls the converter circuit 32 to be turned off, and the control device 36 detects the waveform of the alternating current power source AC according to the positive half cycle and negative half cycle of the waveform, respectively Controls the first transistor S1 to the eighth transistor S8 of the switching circuit 22, and controls the switch circuit 34 to be turned on or off, wherein: during a positive half cycle, the control device 36 controls the transistors of the switching circuit 22 The crystals S1 to S8 are alternately switched between a first rectified configuration (refer to FIG. 6) and a second rectified configuration (refer to FIG. 7), and the control device 36 controls the switch circuit 34 to be turned on during the first rectified configuration. In the second rectification configuration, the switch circuit 34 is controlled to be turned off.

With reference to FIG. 6, the control device 36 turns on the thirteenth transistor S13 and the fourteenth transistor S14 to control the switch circuit 34 to conduct. The first rectifier is configured as the seventh transistor S7, the eighth transistor S8 is turned on, and the first transistor S1, the second transistor S2, the third transistor S3, and the fourth transistor S4. The fifth transistor S5 and the sixth transistor S6 are turned off, so that the electric energy of the alternating current power source AC is transmitted to the primary side to the exciting electric current. Sensing Lm energy storage. The filter capacitor Cr and the filter inductor Lr form a ripple transmission path with the seventh transistor S7 and the eighth transistor S8 to suppress double-frequency ripple. The input capacitor Cin charges the battery 14.

With reference to FIG. 7, the control device 36 turns on the thirteen transistor S13 and turns off the fourteenth transistor S14 to control the switch circuit 34 to turn off. The second rectification is configured as the first transistor S1, the fourth transistor S4, the fifth transistor S5, the sixth transistor S6 are turned on, and the second transistor S2, the third transistor S3. The seventh transistor S7 and the eighth transistor S8 are turned off, so that the excitation inductance Lm is discharged and transmitted to the battery 14 and the input capacitor Cin for charging. In addition, the DC power outputted from the first port 282 of the high-frequency transformer 26 is also transmitted through the ripple provided by the filter capacitor Cr and the filter inductor Lr to suppress the double-frequency ripple.

During the negative half cycle, the control device 36 controls the transistors S1 to S8 of the switching circuit 22 to alternately switch between a third rectified configuration (refer to FIG. 8) and a fourth rectified configuration (refer to FIG. 9). And the control device 36 controls the switch circuit 34 to be turned on in the third rectification configuration, and controls the switch circuit 34 to be turned off in the fourth rectification configuration.

8, the control device 36 turns on the thirteenth transistor S13 and the fourteenth transistor S14 to control the switch circuit 34 to conduct. The third rectification is configured such that the seventh transistor S7, the eighth transistor S8 are turned on, and the first transistor S1 to the sixth transistor S6 are turned off, so that the electric energy of the alternating current power source AC is transmitted to the primary side. 28 stores energy to the excitation inductance Lm. The filter capacitor Cr and the filter inductor Lr form a ripple transmission path with the seventh transistor S7 and the eighth transistor S8 to suppress double-frequency ripple. The input capacitor Cin charges the battery 14.

With reference to FIG. 9, the control device 36 turns off the thirteenth transistor S13 and the fourteenth transistor S14 is turned on, thereby controlling the switch circuit 34 to turn off. The fourth rectifier group The states are that the second transistor S2, the third transistor S3, the fifth transistor S5, the sixth transistor S6 are turned on, and the first transistor S1, the fourth transistor S4, and the seventh transistor The crystal S7 and the eighth transistor S8 are turned off, so that the excitation inductance Lm is discharged and transmitted to the battery 14 and the input capacitor Cin for charging. The filter capacitor Cr and the filter inductor Lr also provide a path for ripple transmission to suppress double-frequency ripple.

FIG. 10 is a waveform diagram of the voltages Vo1, Vo2, Vdc, Vcr, and currents io1, io2, idc, ilr indicated in FIGS. 2 to 5 when the conversion device 20 is operated in the first conversion mode (converter mode). FIG. 11 is a waveform diagram of voltages Vo1, Vo2, Vdc, currents io1, io2, and idc without the ripple suppression circuit 24. As can be seen from the foregoing, the ripple suppression circuit 24 of this embodiment may be the conversion device 20 in the first conversion mode Provides a two-way filtering transmission path to effectively suppress the ripple of the double frequency component.

FIG. 12 is a waveform diagram of the voltages Vac, Vdc, Vcr, currents iac, idc, and ilr indicated in FIGS. 6 to 9 when the conversion device 20 is operated in the second conversion mode (rectifier mode), and FIG. 13 is not provided with ripple. The waveform diagrams of the voltage Vac, Vdc, current iac, idc of the wave suppression circuit 24 can be seen from the foregoing. The ripple suppression circuit 24 of this embodiment can provide a bidirectional filtering transmission path for the conversion device 20 in the second conversion mode, which is effective. Suppresses ripples from double-frequency components.

According to the above, the conversion device 20 of the present invention has a ripple suppression circuit 24, which can suppress double-frequency ripple and improve the performance of the power supply system. For the renewable energy power supply system using the solar panel 12, the maximum power point tracking (Maximun Power Point Tracking) of the solar panel 12 caused by the double-frequency ripple can be avoided, which effectively improves the performance of the power supply system. In addition, after suppressing the double-frequency ripple, the input capacitor Cin can use a non-electrolytic capacitor, such as a film capacitor, and the non-electrolytic capacitor can simply suppress high-frequency noise. This reduces the capacitance value and volume of the input capacitor Cin and makes the life of the input capacitor longer than that of the electrolytic capacitor, thereby improving reliability.

The above descriptions are only the preferred and feasible embodiments of the present invention, and any equivalent changes made by applying the description of the present invention and the scope of patent application should be included in the patent scope of the present invention.

Claims (10)

A renewable energy power supply system for supplying power to at least one load. The renewable energy power supply system includes: a DC power supply module including a renewable energy power generation component and a battery connected in parallel, and the DC power supply module is used to output DC power Or receiving direct current to the battery; a conversion device including a switching circuit, a ripple suppression circuit, a high-frequency transformer, a converter circuit, and a switching circuit, wherein the high-frequency transformer includes a primary side and a The secondary side, wherein the primary side has a first port, the switching circuit is electrically connected to the DC power module, the ripple suppression circuit and the first port on the primary side of the high-frequency transformer, and the ripple suppression The circuit is used to provide a path for ripple transmission to suppress double-frequency ripple. The secondary side has a second port and a third port. The converter circuit is electrically connected to the second port and the load. The switch The circuit is electrically connected to the third port and an AC power source respectively; the conversion device is controlled to operate in one of a first conversion mode and a second conversion mode, where: In the first conversion mode, the switching circuit is controlled to transmit the DC power output from the DC power module to the first port of the high-frequency transformer, and then converts the second port of the high-frequency transformer and the converter circuit AC power is output to the load; in the second conversion mode, the switching circuit is controlled to transmit the AC power to the third port of the high-frequency transformer, and the output is transmitted through the first port on the primary side of the high-frequency transformer. The switching circuit is controlled to convert the electric energy output from the first port on the primary side of the high-frequency transformer to DC power and transmit it to the battery; a control device electrically connected to the conversion device for controlling the conversion device to operate on the first A conversion mode or the second conversion mode. The renewable energy power supply system according to claim 1, wherein the switching circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor. A transistor, a seventh transistor, and an eighth transistor, wherein the transistors each have a first end and a second end, and the transistors are controlled by the control device to make respective The first terminal and the second terminal are turned on or off; the first terminal of the first transistor and the first terminal of the second transistor are electrically connected to a positive terminal of the DC power module; the third terminal The second terminal of the crystal and the second terminal of the fourth transistor are electrically connected to a negative terminal of the DC power module; the first terminal of the fifth transistor is electrically connected to the first terminal of the third transistor and The first terminal of the seventh transistor, the second terminal of the fifth transistor is electrically connected to the second terminal of the first transistor, and the first terminal of the sixth transistor is electrically connected to the fourth terminal of the fourth transistor. A first terminal and a first terminal of the eighth transistor; a second terminal of the sixth transistor is electrically connected to the second transistor; The second terminal; the second terminal of the seventh transistor is electrically connected to the second terminal of the eighth transistor; the two ends of the first port on the primary side of the high-frequency transformer are electrically connected to the first transistor respectively The second terminal and the second terminal of the second transistor; the ripple suppression circuit includes a filter capacitor and a filter inductor, one end of the filter capacitor is connected to one end of the filter inductor, and the other end of the filter capacitor is electrically The first end of the eighth transistor is connected, and the other end of the filter inductor is electrically connected to the first end of the seventh transistor. The renewable energy power supply system according to claim 2, wherein the first port on the primary side of the high-frequency transformer has an excitation inductance; when the control device controls the conversion device to operate in the first conversion mode, it is divided into one The positive half cycle state and the negative half cycle state respectively control the transistors of the switching circuit, so that the converter circuit outputs the positive half cycle waveform and the negative half cycle waveform of the alternating current respectively, wherein: in the positive half cycle state, the control device The transistors controlling the switching circuit are alternately switched between a first converter configuration and a second converter configuration, wherein the first converter configuration is the first transistor and the fourth transistor The fifth transistor and the sixth transistor are turned on, and the second transistor, the third transistor, the seventh transistor, and the eighth transistor are turned off to store energy in the exciting inductor; Two converters are configured such that the seventh transistor, the eighth transistor are on, and the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, The sixth transistor is turned off so that The magnetic field inductor releases energy to the second port on the secondary side of the high-frequency transformer; in the negative half cycle state, the control device controls the transistors of the switching circuit to alternately have a third current-converting configuration and a first Four current conversion configurations are switched, wherein the third current conversion is configured as the second transistor, the third transistor, the fifth transistor, and the sixth transistor are turned on, and the first transistor, the A fourth transistor, the seventh transistor, and the eighth transistor are turned off to store energy in the magnetizing inductance; wherein the fourth converter is configured as the seventh transistor, the eighth transistor is on, and The first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor are turned off, so that the excitation inductance is discharged to the high-frequency transformer. The second port on the secondary side. The renewable energy power supply system according to claim 3, wherein the first transistor to the eighth crystal are n-channel MOSFETs, and the first terminals of the first transistor to the eighth transistor are drain electrodes, respectively. A second terminal of each transistor to the eighth transistor is a source. The renewable energy power supply system according to claim 3, wherein the second port of the secondary side of the high-frequency transformer has a first end and a second end; wherein the current conversion circuit includes a ninth transistor, a first Ten transistors, an eleventh transistor, a twelfth transistor, and at least one output capacitor, wherein the ninth transistor to the twelfth transistor each have a first terminal and a second terminal, The ninth transistor to the twelfth transistor are each controlled by the control device to turn on or off the respective first end and the second end; the first end of the ninth transistor is electrically connected to the first terminal. The first end of two ports; the second end of the ninth transistor is electrically connected to the second end of the tenth transistor, the first terminal of the tenth transistor is electrically connected to one end of the load; the eleventh The first terminal of the transistor is electrically connected to the second terminal of the second port; the second terminal of the eleventh transistor is electrically connected to the second terminal of the twelfth transistor, and the first terminal of the twelfth transistor is electrically connected to the second terminal of the twelfth transistor. One end is electrically connected to the other end of the load; the output capacitor is connected in parallel with the load; wherein the control device is controlling When the transistors of the switching circuit are in the first converter configuration, the control device includes turning on the ninth transistor and the twelfth transistor of the converter circuit, the tenth transistor, and the tenth transistor. A transistor is turned off; when the control device controls the transistors of the switching circuit to be the second converter configuration, the control device includes the ninth transistor, the tenth transistor, The eleventh transistor and the twelfth transistor are turned on; wherein, when the control device controls the transistors of the switching circuit to be the third converter configuration, the control device includes The tenth transistor and the eleventh transistor are turned on, and the ninth transistor and the twelfth transistor are turned off; when the control device controls the transistors of the switching circuit to be the fourth variable current configuration The control device includes turning on the ninth transistor, the tenth transistor, the eleventh transistor, and the twelfth transistor of the converter circuit. The renewable energy power supply system according to claim 5, wherein the ninth transistor to the twelfth transistor are n-channel MOSFETs, and the first ends of the ninth transistor to the twelfth transistor are drain electrodes, respectively. The second ends of the ninth transistor to the twelfth transistor are source electrodes. The renewable energy power supply system according to claim 2, wherein the first port on the primary side of the high-frequency transformer has a magnetizing inductance; when the control device controls the conversion device to operate in the second conversion mode, it is based on the AC The positive half cycle and the negative half cycle of the waveform of the power supply respectively control the transistors and the switching circuit of the switching circuit, wherein: during the positive half cycle, the control device controls the transistors of the switching circuit to alternately rectify a first The configuration is switched with a second rectification configuration, and the control device controls the switch circuit to be turned on during the first rectification configuration, and controls the switch circuit to be turned off during the second rectification configuration, wherein the first rectification configuration is The seventh transistor, the eighth transistor is on, and the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor are off, So that the electric energy of the AC power source stores energy to the magnetizing inductor; the second rectification is configured as the first transistor, the fourth transistor, the fifth transistor, the sixth transistor are turned on, and the second transistor Electricity Body, the third transistor, the seventh transistor, and the eighth transistor are turned off, so that the magnetizing inductance is discharged and transmitted to the battery; when the negative half cycle, the control device controls the electricity of the switching circuit The crystal alternately switches between a third rectified configuration and a fourth rectified configuration, and the control device controls the switch circuit to be turned on during the third rectified configuration, and controls the switch circuit to be turned off during the fourth rectified configuration, where The third rectifier is configured so that the seventh transistor and the eighth transistor are turned on, and the first transistor, the second transistor, the third transistor, the fourth transistor, and the fifth transistor are turned on. The crystal and the sixth transistor are turned off, so that the electric energy of the AC power source stores energy to the magnetizing inductor; the fourth rectification is configured as the second transistor, the third transistor, the fifth transistor, the first transistor The six transistors are turned on, and the first transistor, the fourth transistor, the seventh transistor, and the eighth transistor are turned off, so that the excitation inductance is discharged and transmitted to the battery. The renewable energy power supply system according to claim 7, wherein the switching circuit includes a first switching transistor and a second switching transistor, and the first switching transistor and the second switching transistor are respectively controlled by the control device. Control to turn on or off between the respective first terminal and the second terminal; the first terminal of the first switching transistor is electrically connected to one terminal of the third port, and the second terminal of the first switching transistor is electrically connected Connected to the second end of the second switching transistor; two ends of the AC power supply are electrically connected to the first end of the second switching transistor and the other end of the third port, respectively. The renewable energy power supply system according to claim 8, wherein the first switching transistor and the second switching transistor are n-channel MOSFETs, and the first ends of the first switching transistor and the second switching transistor are Drain, the second terminal of each of the first switching transistor and the second switching transistor is the source; wherein, when the control device is in the first rectified configuration, the control device is to connect the first switching transistor with The second switching transistor is turned on; wherein, when the control device is in the second rectified configuration, the control device turns on the first switching transistor and the second switching transistor is turned off; wherein the control device is on the third In the rectified configuration, the control device turns on the first switching transistor and the second switching transistor; wherein, in the fourth rectified configuration, the control device turns off the first switching transistor. The second switching transistor is turned on. The renewable energy power supply system according to claim 1, includes an input capacitor, and two ends thereof are respectively electrically connected to a positive electrical terminal and a negative electrical terminal of the DC power module, and the input capacitor is a film capacitor.