WO2018157838A1 - 用于混合电源系统的组合dc-dc变换器 - Google Patents

用于混合电源系统的组合dc-dc变换器 Download PDF

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Publication number
WO2018157838A1
WO2018157838A1 PCT/CN2018/077775 CN2018077775W WO2018157838A1 WO 2018157838 A1 WO2018157838 A1 WO 2018157838A1 CN 2018077775 W CN2018077775 W CN 2018077775W WO 2018157838 A1 WO2018157838 A1 WO 2018157838A1
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WIPO (PCT)
Prior art keywords
converter
bidirectional
rechargeable battery
renewable energy
converters
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Application number
PCT/CN2018/077775
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English (en)
French (fr)
Inventor
何志峰
简明德
翁荣华
F 鲁德特
Original Assignee
伊顿智能动力有限公司
何志峰
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Publication date
Application filed by 伊顿智能动力有限公司, 何志峰 filed Critical 伊顿智能动力有限公司
Priority to EP18761917.6A priority Critical patent/EP3591823A4/en
Publication of WO2018157838A1 publication Critical patent/WO2018157838A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the present invention relates to the field of power electronics, and in particular to a combined DC-DC converter for a hybrid power system.
  • Independent photovoltaic systems are affected by environmental factors such as solar radiation intensity and temperature. Photovoltaic power generation has the disadvantages of time-sharing and discontinuity, so it cannot stably supply the required power to the load. These defects in independent photovoltaic systems can be overcome by introducing a hybrid optical power generation system for battery energy storage systems.
  • FIG. 1 is a block diagram of a prior art optical hybrid power generation system. As shown in FIG. 1, the photovoltaic cell 11 is connected to both ends of the storage capacitor 13 through a DC-DC converter 12, and the rechargeable battery 14 is connected to both ends of the storage capacitor 13 through a bidirectional DC-DC converter 15, inverting The input of the device 16 is connected to both ends of the storage capacitor 13 and its output is connected to the load 17 via a switch 18.
  • the DC-DC converter 12 when the sunlight is sufficient, the DC-DC converter 12 is controlled to boost the DC voltage across the photovoltaic cell 11 to a predetermined DC bus voltage to convert the electrical energy in the photovoltaic cell 11. It is stored in the storage capacitor 13 to supply the required AC power to the load 17 through the inverter 16, and the bidirectional DC-DC converter 15 is controlled to step down the voltage across the storage capacitor 13 to the required charging voltage. To charge the rechargeable battery 14 with the electrical energy in the storage capacitor 13. When the sunlight is insufficient or there is no sunlight, the bidirectional DC-DC converter 15 is controlled to boost the voltage across the rechargeable battery 14 to a DC bus voltage to store the electrical energy in the rechargeable battery 14 in the storage capacitor 13. Thus, the load 17 is supplied with the required alternating current through the inverter 16.
  • embodiments of the present invention provide a combined DC-DC converter for a hybrid power supply system including a renewable energy power generation device, a rechargeable battery, and an energy storage device. a capacitor and an inverter connected to the storage capacitor, the combined DC-DC converter comprising:
  • first bidirectional DC-DC converter and a second bidirectional DC-DC converter, the outputs of the first and second bidirectional DC-DC converters being configured to be coupled to the storage capacitor;
  • a switch set configured to connect an input of the first and second bidirectional DC-DC converters to both ends of the renewable energy generating device or the rechargeable battery, or to the first and the Input terminals of the two-way DC-DC converter are respectively connected to both ends of the renewable energy power generation device and the rechargeable battery.
  • the switch group includes: a first switch configured to connect a positive input terminal of the first bidirectional DC-DC converter to a positive pole of the renewable energy power generation device or a rechargeable battery; A switch configured to connect a positive input of the second bidirectional DC-DC converter to a positive pole of the renewable energy generator or rechargeable battery.
  • the switch group further includes: a third switch configured to connect a negative input terminal of the first bidirectional DC-DC converter to a negative pole of the renewable energy power generation device or the rechargeable battery; A four switch configured to connect a negative input of the second bidirectional DC-DC converter to a negative of the renewable energy generator or rechargeable battery.
  • the first bidirectional DC-DC converter and the second bidirectional DC-DC converter are the same.
  • the bidirectional DC-DC converter includes: an inductor; a first switching transistor having a first anti-parallel diode; a second switching transistor having a second anti-parallel diode; wherein one end of the inductor is connected to the The cathode of the first anti-parallel diode and the anode of the second anti-parallel diode.
  • the other end of the inductor and the anode of the first anti-parallel diode are connected to an input end of the first bidirectional DC-DC converter, a cathode of the second anti-parallel diode, and the An anode of an anti-parallel diode is coupled to an output of the first bidirectional DC-DC converter.
  • a controller is further included for controlling a conduction state of the switch group and an operation mode of the first and second bidirectional DC-DC converters.
  • the controller is configured to: control the switch group such that an input end of the first and second bidirectional DC-DC converters is connected to Both ends of the renewable energy generating device; and controlling the first and second bidirectional DC-DC converters to convert a voltage across the renewable energy generating device to a predetermined DC bus voltage.
  • the controller is configured to: control the switch group such that the first and second directions An input end of the DC-DC converter is respectively connected to both ends of the renewable energy generating device and the rechargeable battery; and the first bidirectional DC-DC converter is controlled to convert the voltage across the renewable energy generating device Transforming to a predetermined DC bus voltage, and controlling the second bidirectional DC-DC converter to convert a voltage across the rechargeable battery to a predetermined DC bus voltage.
  • the controller is configured to: control the switch group such that the first and second bidirectional DC-DC conversion An input of the device is coupled to both ends of the rechargeable battery; and the first and second bidirectional DC-DC converters are controlled to convert a voltage across the rechargeable battery to a predetermined DC bus voltage.
  • the controller is configured to: control the switch group such that the first and the first An input end of the two-way DC-DC converter is respectively connected to both ends of the renewable energy power generation device and the rechargeable battery; and the first two-way DC-DC converter is controlled to set the renewable energy power generation device The voltage at the terminal is converted to a predetermined DC bus voltage, and the second bidirectional DC-DC converter is controlled to charge the rechargeable battery.
  • the hybrid power system includes a bypass switch in series with an alternating current power source, and when the renewable energy power generating device has electrical energy, and the electrical energy in the rechargeable battery is less than a predetermined threshold, the controller is configured to: Controlling the switch group such that inputs of the first and second bidirectional DC-DC converters are respectively coupled to both ends of the renewable energy generating device and the rechargeable battery; controlling the bypass switch to close The alternating current in the alternating current power source is rectified and stored in the storage capacitor; and the first bidirectional DC-DC converter is controlled to convert a voltage across the renewable energy power generating device into a predetermined DC bus voltage, and The second bi-directional DC-DC converter is controlled to charge the rechargeable battery with electrical energy on the storage capacitor.
  • the hybrid power supply system includes a bypass switch in series with an alternating current power source, and when the renewable energy power generation device does not provide power, and the power in the rechargeable battery is less than a predetermined threshold, the controller is used for Controlling the switch group such that an input of the first and second bidirectional DC-DC converters is coupled to both ends of the rechargeable battery; controlling the bypass switch to be closed to cause an alternating current in the alternating current power source And being stored in the storage capacitor after rectification; and controlling the first and second bidirectional DC-DC converters to charge the rechargeable battery with electrical energy on the storage capacitor.
  • the combined DC-DC converter further comprises: a third bidirectional DC-DC converter in parallel with the first bidirectional DC-DC converter, the controller controlling the first and the first in the same operating mode a three-way DC-DC converter; or a fourth bidirectional DC-DC converter in parallel with the second bidirectional DC-DC converter, the controller controlling the second and fourth bidirectional DC-DCs in the same operational mode Converter.
  • the combined DC-DC converter of the present invention is small in size, light in weight, and low in cost.
  • FIG. 1 is a block diagram of a prior art optical hybrid power generation system.
  • FIG. 2 is a circuit diagram of a hybrid power supply system in accordance with a first embodiment of the present invention.
  • FIG. 3 is an equivalent circuit diagram of the hybrid power supply system shown in FIG. 2 in a first mode of operation.
  • FIG. 4 is an equivalent circuit diagram of the hybrid power supply system shown in FIG. 2 in a second mode of operation.
  • Figure 5 is an equivalent circuit diagram of the hybrid power supply system of Figure 2 in a third mode of operation.
  • Figure 6 is an equivalent circuit diagram of the hybrid power supply system of Figure 2 in a fourth mode of operation.
  • Figure 7 is an equivalent circuit diagram of the hybrid power supply system of Figure 2 in a fifth mode of operation.
  • Figure 8 is an equivalent circuit diagram of the hybrid power supply system of Figure 2 in a sixth mode of operation.
  • Figure 9 is a circuit diagram of a hybrid power supply system in accordance with a second embodiment of the present invention.
  • Figure 10 is a circuit diagram of a hybrid power supply system in accordance with a third embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a hybrid power supply system in accordance with a first embodiment of the present invention.
  • a hybrid power source composed of a photovoltaic cell 21 and a rechargeable battery 24 is connected to the storage capacitor 23 through a combined DC-DC converter 2.
  • the combined DC-DC converter 2 includes a switch block 27, a bidirectional DC-DC converter 22, and a bidirectional DC-DC converter 25.
  • the bidirectional DC-DC converters 22, 25 are identical.
  • the bidirectional DC-DC converter 22 will now be described as an example. It includes an inductor L1, a switching transistor Q1 having an antiparallel diode D1, and a switching transistor Q2 having an antiparallel diode D2.
  • One end of the inductor L1 is connected to the cathode of the anti-parallel diode D1 and the anode of the anti-parallel diode D2, wherein the inductor L1, the switch transistor Q1 and the anti-parallel diode D2 constitute a Boost circuit, the inductor L1, the switch transistor Q2 and the anti-parallel diode D1 constitutes a Buck circuit.
  • the switch group 27 includes four switches S1, S2, S3, and S4, wherein the switches S1 and S3 are controlled to connect the positive input terminal 221 and the negative input terminal 222 of the bidirectional DC-DC converter 22 to the photovoltaic cell 21 or a rechargeable battery. 24. Switches S2 and S4 are controlled to connect positive input 251 and negative input 252 of bidirectional DC-DC converter 25 to photovoltaic cell 21 or rechargeable battery 24.
  • the combined DC-DC converter 2 also includes a controller 28 for controlling the switching or conducting state of the switch block 27 and controlling the mode of operation of the bidirectional DC-DC converters 22, 25.
  • the controller 28 controls the switches S1, S2 such that the positive pole 211 of the photovoltaic cell 21 is connected to the positive input of the bidirectional DC-DC converters 22, 25. 221, 251, control switches S3, S4 such that the negative pole 212 of the photovoltaic cell 21 is coupled to the negative input terminals 222, 252 of the bidirectional DC-DC converters 22, 25.
  • FIG. 3 shows an equivalent circuit diagram of the hybrid power system in a first mode of operation.
  • the bidirectional DC-DC converters 22, 25 are connected in parallel between the photovoltaic cell 21 and the storage capacitor 23.
  • the controller 28 controls the bidirectional DC-DC converters 22 and 25 to operate, and provides pulse width modulation signals to the switching tubes Q1 and Q3 to boost the DC voltage across the photovoltaic cells 21 to the DC voltages required for the ends of the storage capacitors 23, respectively. (ie, a predetermined DC bus voltage) while the electrical energy in the photovoltaic cell 21 is stored in the storage capacitor 23. Since the storage capacitor 23 is supplied with 6 KW of electric energy through the bidirectional DC-DC converters 22, 25, the bidirectional DC-DC converters 22, 25 having a small power (for example, 3 kW) can be selected.
  • the controller 28 controls the switches S1, S3 such that the positive electrode 211 and the negative electrode 212 of the photovoltaic cell 21 are respectively connected to the two-way.
  • the positive input terminal 221 and the negative input terminal 222 of the DC-DC converter 22, and the control switches S2, S4 are such that the positive and negative terminals of the rechargeable battery 24 are respectively connected to the positive input terminal 251 and the negative input of the bidirectional DC-DC converter 25. End 252.
  • Figure 4 shows an equivalent circuit diagram of the hybrid power system in a second mode of operation.
  • the controller 28 controls the operation of the bidirectional DC-DC converters 22, 25 to provide pulse width modulation signals to the switching transistors Q1, Q3, respectively boosting the DC voltages across the photovoltaic cells 21 and the rechargeable battery 24 to
  • the predetermined DC bus voltage is simultaneously stored in the storage capacitor 23 with the electrical energy in the photovoltaic cell 21 and the rechargeable battery 24. Since the storage capacitor 23 is supplied with 6 kW of electric energy by the bidirectional DC-DC converters 22, 25, the bidirectional DC-DC converters 22, 25 having a small power (for example, 3 kW) can be selected.
  • the controller 28 controls the switches S1, S2 such that the positive pole of the rechargeable battery 24 is connected to the bidirectional DC-DC converter 22, 25.
  • Positive input terminals 221, 251, and control switches S3, S4 connect the negative terminals of rechargeable battery 24 to the negative input terminals 222, 252 of bidirectional DC-DC converters 22, 25.
  • FIG. 5 shows an equivalent circuit diagram of the hybrid power system in a third mode of operation.
  • the bidirectional DC-DC converters 22, 25 are connected in parallel between the rechargeable battery 24 and the storage capacitor 23.
  • the controller 28 controls the operation of the bidirectional DC-DC converters 22, 25 to provide pulse width modulation signals to the switching tubes Q1, Q3, boosts the DC voltage across the rechargeable battery 24 to a predetermined DC bus voltage, and simultaneously charges the battery.
  • the electrical energy in 24 is stored in the storage capacitor 23. Since the storage capacitor 23 is supplied with 6 kW of electric energy by the bidirectional DC-DC converters 22, 25, the bidirectional DC-DC converters 22, 25 having a small power (for example, 3 kW) can be selected.
  • the controller 28 controls the switches S1, S3 such that the positive electrode 211 and the negative electrode 212 of the photovoltaic cell 21 are respectively connected.
  • the control switches S2, S4 are such that the positive and negative terminals of the rechargeable battery 24 are respectively connected to the positive input terminal 251 of the bidirectional DC-DC converter 25 and Negative input 252.
  • Figure 6 shows an equivalent circuit diagram of the hybrid power system in a fourth mode of operation.
  • the controller 28 controls the operation of the bidirectional DC-DC converter 22, and supplies a pulse width modulation signal to the switch Q1 to boost the DC voltage across the photovoltaic cell 21 to a predetermined DC bus voltage, thereby turning on the photovoltaic cell.
  • the electrical energy in 21 is stored in the storage capacitor 23.
  • the controller 28 also controls the operation of the bidirectional DC-DC converter 25 to provide a pulse width modulated signal to the switching transistor Q4 to obtain a reduced charging voltage at the input of the bidirectional DC-DC converter 25 while utilizing the storage capacitor 23
  • the rechargeable battery 24 is charged by electrical energy.
  • the controller 28 controls the switches S1, S3 such that the positive electrode 211 and the negative electrode 212 of the photovoltaic cell 21 are respectively coupled to the bidirectional DC-DC conversion.
  • the positive input terminal 221 and the negative input terminal 222 of the device 22 control the switches S2 and S4 such that the positive and negative terminals of the rechargeable battery 24 are respectively connected to the positive input terminal 251 and the negative input terminal 252 of the bidirectional DC-DC converter 25, and are controlled.
  • the bypass switch S5 and the switch S6 are closed, so that the AC power source 29 is connected to the storage capacitor 23 through a rectifying device constituted by a diode (not shown) in the full-bridge inverter 26.
  • Figure 7 shows an equivalent circuit diagram of the hybrid power system in a fifth mode of operation.
  • the controller 28 controls the operation of the bidirectional DC-DC converter 22 to provide a pulse width modulation signal to the switching transistor Q1 to store the electrical energy in the photovoltaic cell 21 in the storage capacitor 23 and to control the bidirectional DC-
  • the DC converter 25 operates to provide a pulse width modulation signal to the switching transistor Q4 to charge the rechargeable battery 24 with the electrical energy in the storage capacitor 23.
  • the controller 28 controls the switches S1, S2 such that the positive pole of the rechargeable battery 24 is coupled to the positive input of the bidirectional DC-DC converter 22, 25. Terminals 221, 251, and control switches S3, S4 such that the cathode of the rechargeable battery 24 is connected to the negative input terminals 222, 252 of the bidirectional DC-DC converters 22, 25, and the control bypass switch S5, switch S6 is closed, so that the AC
  • the power supply 29 is connected to the storage capacitor 23 by a rectifying means composed of a diode in the full bridge inverter 26.
  • FIG. 8 shows an equivalent circuit diagram of the hybrid power system in a sixth mode of operation.
  • the controller 28 controls the bidirectional DC-DC converters 22, 25 to operate, provides pulse width modulation signals to the switching transistors Q2, Q4, and charges the rechargeable battery 24 with the electrical energy on the storage capacitors 23. Since the rechargeable battery 24 is charged by the bidirectional DC-DC converters 22, 25 at a power of 6 KW, the bidirectional DC-DC converters 22, 25 having a small power (for example, 3 kW) can be selected.
  • the present invention can select the bidirectional DC-DC converters 22, 25 with lower power (relative to the output power), thereby reducing the volume of the combined DC-DC converter 2 and reducing its Weight and reduce its cost.
  • FIG. 9 is a circuit diagram of a hybrid power supply system in accordance with a second embodiment of the present invention. It is substantially the same as FIG. 2 except that the negative electrode of the photovoltaic cell 31 and the negative electrode of the rechargeable battery 34 are connected to the negative input terminals 322, 352 of the bidirectional DC-DC converters 32, 35.
  • the combined DC-DC converter 3 includes a switch bank 37 and bidirectional DC-DC converters 32, 35, wherein the controller 38 controls the conduction modes of the switches S31, S32 in the switch group 37 and the bidirectional DC-DC converters 32, 35
  • the working mode is basically the same as that of FIG. 2, and details are not described herein again.
  • FIG. 10 is a circuit diagram of a hybrid power supply system in accordance with a third embodiment of the present invention. It is basically the same as FIG. 9 except that the combined DC-DC converter 4 further includes a bidirectional DC-DC converter 45' in parallel with the bidirectional DC-DC converter 45, that is, an input terminal of the bidirectional DC-DC converter 45'. And the output terminal is respectively connected to the input terminal and the output terminal of the bidirectional DC-DC converter 45; and the controller 48 controls the bidirectional DC-DC converter 45, 45' to have the same operation mode, that is, to the bidirectional DC-DC converter 45.
  • the corresponding switch tubes in 45' provide the same pulse width modulation signal, so that the bidirectional DC-DC converters 45, 45' with lower power can be selected.
  • the controller 48 controls the conduction mode of the switch group 47 and the operation modes of the bidirectional DC-DC converters 42, 45 are substantially the same as those of FIG. 9, and are not described herein again.
  • the output of the bidirectional DC-DC converter 22, 25 passes through the switch block. 27 is connected to the photovoltaic cell 21 and the rechargeable battery 24, the positive input terminal 221 and the negative input of the bidirectional DC-DC converter 22 are connected to both ends of the storage capacitor 23, and the positive input terminal of the bidirectional DC-DC converter 25 The 251 and negative input terminals 252 are connected to both ends of the storage capacitor 23.
  • the combined DC-DC converter 2 further includes one or more bidirectional DC-DC converters in parallel with the bidirectional DC-DC converter 22. In still another embodiment of the invention, the combined DC-DC converter 2 further includes one or more bidirectional DC-DC converters in parallel with the bidirectional DC-DC converter 25.
  • the bidirectional DC-DC converter of the present invention is not limited to being constituted by one inductor and two switching tubes having anti-parallel diodes. In other embodiments of the invention, any other bidirectional DC-DC converter of the prior art may also be employed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种用于混合电源系统的组合DC-DC变换器(2)，该混合电源系统包括可再生能源发电装置(21)、可充电电池(24)、储能电容(23)和连接至储能电容的逆变器(26)，其中组合DC-DC变换器包括：第一双向DC-DC变换器(22)和第二双向DC-DC变换器(25)，第一和第二双向DC-DC变换器的输出端被配置连接至储能电容；以及开关组(27)，其被配置用于将第一和第二双向DC-DC变换器的输入端连接至可再生能源发电装置或可充电电池的两端，或将第一和第二双向DC-DC变换器的输入端分别连接至可再生能源发电装置或可充电电池的两端。该组合DC-DC变换器的体积小、重量轻、成本低。

Description

用于混合电源系统的组合DC-DC变换器 技术领域
本发明涉及电力电子领域，具体涉及一种用于混合电源系统的组合DC-DC变换器。
背景技术
独立光伏系统由于受到太阳光辐照强度、温度等环境因素的影响，光伏发电具有分时性、断续性等缺点，因此无法稳定向负载提供所需的电能。通过引入蓄电池储能系统的光储混合发电系统可以克服独立光伏系统的这些缺陷。
图1是现有技术中的光储混合发电系统的方框图。如图1所示，光伏电池11通过DC-DC变换器12连接至储能电容13的两端，可充电电池14通过双向DC-DC变换器15连接至储能电容13的两端，逆变器16的输入端连接至储能电容13两端，其输出端通过开关18连接至负载17。
在图1的光储混合发电系统中，当阳光充足时，DC-DC变换器12被控制为将光伏电池11两端的直流电压升压为预定的直流母线电压，以将光伏电池11中的电能储存在储能电容13中，从而通过逆变器16给负载17提供所需的交流电，且双向DC-DC变换器15被控制为将储能电容13两端的电压降压为所需的充电电压，以利用储能电容13中的电能对可充电电池14进行充电。当阳光不充足或没有阳光时，双向DC-DC变换器15被控制为将可充电电池14两端的电压升压为直流母线电压，以将可充电电池14中的电能储存在储能电容13中，从而通过逆变器16给负载17提供所需的交流电。
假定负载17的额定功率是6KW，为了能够持续并稳定向负载17提供6KW的电能，必须选用6KW以上的DC-DC变换器12和6KW以上的双向DC-DC变换器15。本领域的技术人员应知，DC-DC变换器12和双向DC-DC变换器15的功率越大，其体积越大、重量越重、成本越高。
因此，在光储混合发电系统的输出功率保持不变的情况下，如何减小其体积、减轻其重量并降低其成本，成为目前亟待解决的技术问题。
发明内容
针对现有技术存在的上述技术问题，本发明的实施例提供了一种用于混合电源系统的组合DC-DC变换器，所述混合电源系统包括可再生能源发电装置、可充电电池、储能电容和连接至所述储能电容的逆变器，所述组合DC-DC变换器包括：
第一双向DC-DC变换器和第二双向DC-DC变换器，所述第一和第二双向DC-DC变换器的输出端被配置连接至所述储能电容；
开关组，其被配置用于将所述第一和第二双向DC-DC变换器的输入端连接至所述可再生能源发电装置或可充电电池的两端，或将所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端。
优选的，所述开关组包括：第一开关，其被配置为将所述第一双向DC-DC变换器的正极输入端连接至所述可再生能源发电装置或可充电电池的正极；第二开关，其被配置为将所述第二双向DC-DC变换器的正极输入端连接至所述可再生能源发电装置或可充电电池的正极。
优选的，所述开关组还包括：第三开关，其被配置为将所述第一双向DC-DC变换器的负极输入端连接至所述可再生能源发电装置或可充电电池的负极；第四开关，其被配置为将所述第二双向DC-DC变换器的负极输入端连接至所述可再生能源发电装置或可充电电池的负极。
优选的，所述第一双向DC-DC变换器和第二双向DC-DC变换器相同。
优选的，所述双向DC-DC变换器包括：电感；具有第一反向并联二极管的第一开关管；具有第二反向并联二极管的第二开关管；其中所述电感的一端连接至所述第一反向并联二极管的阴极和所述第二反向并联二极管的阳极。
优选的，所述电感的另一端和所述第一反向并联二极管的阳极连接至所述第一双向DC-DC变换器的输入端，所述第二反向并联二极管的阴极和所述第一反向并联二极管的阳极连接至所述第一双向DC-DC变换器的输出端。
优选的，还包括控制器，其用于控制所述开关组的导通状态和所述第一和第二双向DC-DC变换器的工作模式。
优选的，当所述可再生能源发电装置能够提供负载所需的功率时，所述控制器用于：控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端连接至所述可再生能源发电装置的两端；以及控制所述第一和第二双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压。
优选的，当所述可再生能源发电装置不能够提供负载所需的功率、且所述可充电电池具有电能时，所述控制器用于：控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端；以及控制所述第一双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压，且控制所述第二双向DC-DC变换器以将所述可充电电池两端的电压变换为预定的直流母线电压。
优选的，当所述可再生能源发电装置不能够提供电能，且所述可充电电池具有电能时，所述控制器用于：控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端连接至所述可充电电池的两端；以及控制所述第一和第二双向DC-DC变换器以将所述可充电电池两端的电压变换为预定的直流母线电压。
优选的，当所述可再生能源发电装置的输出功率大于负载功率，且所述可充电电池的电能小于预定的阈值时，所述控制器用于：控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端；以及控制所述第一双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压，且控制所述第二双向DC-DC变换器以对所述可充电电池进行充电。
优选的，所述混合电源系统包括与交流电源串联的旁路开关，当所述可再生能源发电装置具有电能，且所述可充电电池中的电能小于预定的阈值时，所述控制器用于：控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两 端；控制所述旁路开关闭合以使得所述交流电源中的交流电整流后储存在所述储能电容中；以及控制所述第一双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压，且控制所述第二双向DC-DC变换器以利用所述储能电容上的电能对所述可充电电池进行充电。
优选的，所述混合电源系统包括与交流电源串联的旁路开关，当所述可再生能源发电装置不提供电能，且所述可充电电池中的电能小于预定的阈值时，所述控制器用于：控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端连接至所述可充电电池的两端；控制所述旁路开关闭合以使得所述交流电源中的交流电整流后储存在所述储能电容中；以及控制所述第一和第二双向DC-DC变换器以利用所述储能电容上的电能对所述可充电电池进行充电。
优选的，所述组合DC-DC变换器还包括：与第一双向DC-DC变换器并联的第三双向DC-DC变换器，所述控制器以相同的工作模式控制所述第一和第三双向DC-DC变换器；或与所述第二双向DC-DC变换器并联的第四双向DC-DC变换器，所述控制器以相同的工作模式控制第二和第四双向DC-DC变换器。
本发明的组合DC-DC变换器的体积小、重量轻、成本低。
附图说明
以下参照附图对本发明实施例作进一步说明，其中：
图1是现有技术中的光储混合发电系统的方框图。
图2是根据本发明第一个实施例的混合电源系统的电路图。
图3是图2所示的混合电源系统处于第一工作模式的等效电路图。
图4是图2所示的混合电源系统处于第二工作模式的等效电路图。
图5是图2所示的混合电源系统处于第三工作模式的等效电路图。
图6是图2所示的混合电源系统处于第四工作模式的等效电路图。
图7是图2所示的混合电源系统处于第五工作模式的等效电路图。
图8是图2所示的混合电源系统处于第六工作模式的等效电路图。
图9是根据本发明第二个实施例的混合电源系统的电路图。
图10是根据本发明第三个实施例的混合电源系统的电路图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图通过具体实施例对本发明进一步详细说明。
图2是根据本发明第一个实施例的混合电源系统的电路图。如图2所示，由光伏电池21和可充电电池24构成的混合电源通过组合DC-DC变换器2连接至储能电容23。组合DC-DC变换器2包括开关组27、双向DC-DC变换器22和双向DC-DC变换器25。
双向DC-DC变换器22、25完全相同。现仅以双向DC-DC变换器22为例进行说明，其包括一个电感L1、具有反向并联二极管D1的开关管Q1和具有反向并联二极管D2的开关管Q2。电感L1的一端连接至反向并联二极管D1的阴极和反向并联二极管D2的阳极，其中电感L1、开关管Q1和反向并联二极管D2构成Boost电路，电感L1、开关管Q2和反向并联二极管D1构成Buck电路。
开关组27包括四个开关S1、S2、S3和S4，其中开关S1和S3被控制为将双向DC-DC变换器22的正极输入端221和负极输入端222连接至光伏电池21或可充电电池24，开关S2和S4被控制为将双向DC-DC变换器25的正极输入端251和负极输入端252连接至光伏电池21或可充电电池24。
组合DC-DC变换器2还包括控制器28，其用于控制开关组27的切换或导通状态，以及控制双向DC-DC变换器22、25的工作模式。
下面将结合图3-8来详细说明本实施例的组合DC-DC变换器2的各个工作模式。
1、第一工作模式
假如负载20的功率为6KW，且光伏电池21能够提供功率为6KW的电能，控制器28控制开关S1、S2使得光伏电池21的正极211连接至双向DC-DC变换器22、25的正极输入端221、251，控制开关S3、S4使得 光伏电池21的负极212连接至双向DC-DC变换器22、25的负极输入端222、252。
图3示出了混合电源系统处于第一工作模式的等效电路图。如图3所示，双向DC-DC变换器22、25并联连接在光伏电池21和储能电容23之间。控制器28控制双向DC-DC变换器22、25工作，给开关管Q1、Q3提供脉宽调制信号，分别将光伏电池21两端的直流电压升压为储能电容23两端所需的直流电压(即预定的直流母线电压)，同时将光伏电池21中的电能储存在储能电容23中。由于是通过双向DC-DC变换器22、25共同给储能电容23提供6KW的电能，可以选择功率较小(例如3KW)的双向DC-DC变换器22、25。
2、第二工作模式
假如负载20的功率为6KW，光伏电池21不足以提供功率为6KW的电能，且可充电电池24具有电能，控制器28控制开关S1、S3使得光伏电池21的正极211和负极212分别连接至双向DC-DC变换器22的正极输入端221和负极输入端222，且控制开关S2、S4使得可充电电池24的正极和负极分别连接至双向DC-DC变换器25的正极输入端251和负极输入端252。
图4示出了混合电源系统处于第二工作模式的等效电路图。如图4所示，控制器28控制双向DC-DC变换器22、25工作，给开关管Q1、Q3提供脉宽调制信号，分别将光伏电池21和可充电电池24两端的直流电压升压为预定的直流母线电压，同时将光伏电池21和可充电电池24中的电能储存在储能电容23中。由于是通过双向DC-DC变换器22、25共同给储能电容23提供6KW的电能，因此可以选择功率较小(例如3KW)的双向DC-DC变换器22、25。
3、第三工作模式
假如负载20的功率为6KW，光伏电池21无法提供电能，而可充电电池24具有电能，控制器28控制开关S1、S2使得可充电电池24的正极连接至双向DC-DC变换器22、25的正极输入端221、251，且控制开关S3、S4使得可充电电池24的负极连接至双向DC-DC变换器22、25的负 极输入端222、252。
图5示出了混合电源系统处于第三工作模式的等效电路图。如图5所示，双向DC-DC变换器22、25并联连接在可充电电池24和储能电容23之间。控制器28控制双向DC-DC变换器22、25工作，给开关管Q1、Q3提供脉宽调制信号，将可充电电池24两端的直流电压升压为预定的直流母线电压，同时将可充电电池24中的电能储存在储能电容23中。由于是通过双向DC-DC变换器22、25共同给储能电容23提供6KW的电能，因此可以选择功率较小(例如3KW)的双向DC-DC变换器22、25。
4、第四工作模式
假如负载20的功率为2KW，光伏电池能够提供3KW的电能，且可充电电池24中的电能小于预定的阈值时，控制器28控制开关S1、S3使得光伏电池21的正极211和负极212分别连接至双向DC-DC变换器22的正极输入端221和负极输入端222，且控制开关S2、S4使得可充电电池24的正极和负极分别连接至双向DC-DC变换器25的正极输入端251和负极输入端252。
图6示出了混合电源系统处于第四工作模式的等效电路图。如图6所示，控制器28控制双向DC-DC变换器22工作，给开关管Q1提供脉宽调制信号，将光伏电池21两端的直流电压升压为预定的直流母线电压，从而将光伏电池21中的电能储存在储能电容23中。控制器28还控制双向DC-DC变换器25工作，给开关管Q4提供脉宽调制信号，从而在双向DC-DC变换器25的输入端得到降低的充电电压，同时利用储能电容23中的电能对可充电电池24进行充电。
5、第五工作模式
假如光伏电池21能够提供2KW的电能，且可充电电池24中的电能低于预定的阈值，控制器28控制开关S1、S3使得光伏电池21的正极211和负极212分别连接至双向DC-DC变换器22的正极输入端221和负极输入端222，控制开关S2、S4使得可充电电池24的正极和负极分别连接至双向DC-DC变换器25的正极输入端251和负极输入端252，且控制旁路开关S5、开关S6闭合，使得交流电源29通过全桥逆变器26中的二极管 (图中未示出)构成的整流装置连接至储能电容23。
图7示出了混合电源系统处于第五工作模式的等效电路图。如图7所示，控制器28控制双向DC-DC变换器22工作，给开关管Q1提供脉宽调制信号，以将光伏电池21中的电能储存在储能电容23中，且控制双向DC-DC变换器25工作，给开关管Q4提供脉宽调制信号，以利用储能电容23中的电能对可充电电池24进行充电。
6、第六工作模式
假如光伏电池21无法提供电能，且可充电电池24中的电能低于预定值，控制器28控制开关S1、S2使得可充电电池24的正极连接至双向DC-DC变换器22、25的正极输入端221、251，且控制开关S3、S4使得可充电电池24的负极连接至双向DC-DC变换器22、25的负极输入端222、252，且控制旁路开关S5、开关S6闭合，使得交流电源29通过全桥逆变器26中的二极管构成的整流装置连接至储能电容23。
图8示出了混合电源系统处于第六工作模式的等效电路图。如图8所示，控制器28控制双向DC-DC变换器22、25工作，给开关管Q2、Q4提供脉宽调制信号，利用储能电容23上的电能对可充电电池24进行充电。由于是通过双向DC-DC变换器22、25共同以6KW的功率对可充电电池24进行充电，因此可以选择功率较小(例如3KW)的双向DC-DC变换器22、25。
通过上面的实施例，可以看出，本发明可以选用功率较小(相对于输出功率)的双向DC-DC变换器22、25，因此减小了组合DC-DC变换器2的体积、减轻其重量并降低其成本。
图9是根据本发明第二个实施例的混合电源系统的电路图。其与图2基本相同，区别在于，光伏电池31的负极和可充电电池34的负极与双向DC-DC变换器32、35的负极输入端322、352相连接。组合DC-DC变换器3包括开关组37和双向DC-DC变换器32、35，其中控制器38控制开关组37中的开关S31、S32的导通模式以及双向DC-DC变换器32、35的工作模式与图2基本相同，在此不再赘述。
图10是根据本发明第三个实施例的混合电源系统的电路图。其与图9 基本相同，区别在于，组合DC-DC变换器4还包括与双向DC-DC变换器45并联的双向DC-DC变换器45’，即双向DC-DC变换器45’的输入端和输出端分别与双向DC-DC变换器45的输入端和输出端相连；且控制器48控制双向DC-DC变换器45、45’具有相同的工作模式，即给双向DC-DC变换器45、45’中相对应的开关管提供相同的脉宽调制信号，因此可以选择功率更小的双向DC-DC变换器45、45’。控制器48控制开关组47的导通模式以及双向DC-DC变换器42、45的工作模式与图9基本相同，在此不再赘述。
本领域的技术人员可知，在其它的实施例中，当光伏电池21和可充电电池24两端的电压高于预定的直流母线电压时，双向DC-DC变换器22、25的输出端通过开关组27连接至光伏电池21和可充电电池24，双向DC-DC变换器22的正极输入端221和负极输入端连接至储能电容23的两端，且双向DC-DC变换器25的正极输入端251和负极输入端252连接至储能电容23的两端。
在本发明的另一个实施例中，组合DC-DC变换器2还包括与双向DC-DC变换器22并联的一个或者多个双向DC-DC变换器。在本发明的又一个实施例中，组合DC-DC变换器2还包括与双向DC-DC变换器25并联的一个或者多个双向DC-DC变换器。
本发明的双向DC-DC变换器并不限制于由一个电感和两个具有反向并联二极管的开关管构成。在本发明的其它实施例中，还可以采用现有技术中的任意其他双向DC-DC变换器。
虽然本发明已经通过优选实施例进行了描述，然而本发明并非局限于这里所描述的实施例，在不脱离本发明范围的情况下还包括所作出的各种改变以及变化。

Claims (14)

  1. 一种用于混合电源系统的组合DC-DC变换器，所述混合电源系统包括可再生能源发电装置、可充电电池、储能电容和连接至所述储能电容的逆变器，其特征在于，所述组合DC-DC变换器包括：
    第一双向DC-DC变换器和第二双向DC-DC变换器，所述第一和第二双向DC-DC变换器的输出端被配置连接至所述储能电容；
    开关组，其被配置用于将所述第一和第二双向DC-DC变换器的输入端连接至所述可再生能源发电装置或可充电电池的两端，或将所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端。
  2. 根据权利要求1所述的用于混合电源系统的组合DC-DC变换器，其特征在于，所述开关组包括：
    第一开关，其被配置为将所述第一双向DC-DC变换器的正极输入端连接至所述可再生能源发电装置或可充电电池的正极；
    第二开关，其被配置为将所述第二双向DC-DC变换器的正极输入端连接至所述可再生能源发电装置或可充电电池的正极。
  3. 根据权利要求2所述的用于混合电源系统的组合DC-DC变换器，其特征在于，所述开关组还包括：
    第三开关，其被配置为将所述第一双向DC-DC变换器的负极输入端连接至所述可再生能源发电装置或可充电电池的负极；
    第四开关，其被配置为将所述第二双向DC-DC变换器的负极输入端连接至所述可再生能源发电装置或可充电电池的负极。
  4. 根据权利要求1所述的用于混合电源系统的组合DC-DC变换器，其特征在于，所述第一双向DC-DC变换器和第二双向DC-DC变换器相同。
  5. 根据权利要求4所述的用于混合电源系统的组合DC-DC变换器，其特征在于，所述双向DC-DC变换器包括：
    电感；
    具有第一反向并联二极管的第一开关管；
    具有第二反向并联二极管的第二开关管；
    其中所述电感的一端连接至所述第一反向并联二极管的阴极和所述第二反向并联二极管的阳极。
  6. 根据权利要求5所述的用于混合电源系统的组合DC-DC变换器，其特征在于，所述电感的另一端和所述第一反向并联二极管的阳极连接至所述第一双向DC-DC变换器的输入端，所述第二反向并联二极管的阴极和所述第一反向并联二极管的阳极连接至所述第一双向DC-DC变换器的输出端。
  7. 根据权利要求1至6中任一项所述的用于混合电源系统的组合DC-DC变换器，其特征在于，还包括控制器，其用于控制所述开关组的导通状态和所述第一和第二双向DC-DC变换器的工作模式。
  8. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，其特征在于，当所述可再生能源发电装置能够提供负载所需的功率时，所述控制器用于：
    控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端连接至所述可再生能源发电装置的两端；以及
    控制所述第一和第二双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压。
  9. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，其特征在于，当所述可再生能源发电装置不能够提供负载所需的功率、且所述可充电电池具有电能时，所述控制器用于：
    控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端；以及
    控制所述第一双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压，且控制所述第二双向DC-DC变换器以将所述可充电电池两端的电压变换为预定的直流母线电压。
  10. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，其特征在于，当所述可再生能源发电装置不能够提供电能，且所述可充电电池具有电能时，所述控制器用于：
    控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端连接至所述可充电电池的两端；以及
    控制所述第一和第二双向DC-DC变换器以将所述可充电电池两端的电压变换为预定的直流母线电压。
  11. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，其特征在于，当所述可再生能源发电装置的输出功率大于负载功率，且所述可充电电池的电能小于预定的阈值时，所述控制器用于：
    控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端；以及
    控制所述第一双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压，且控制所述第二双向DC-DC变换器以对所述可充电电池进行充电。
  12. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，所述混合电源系统包括与交流电源串联的旁路开关，其特征在于，当所述可再生能源发电装置具有电能，且所述可充电电池中的电能小于预定的阈值时，所述控制器用于：
    控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端分别连接至所述可再生能源发电装置和可充电电池的两端；
    控制所述旁路开关闭合以使得所述交流电源中的交流电整流后储存在所述储能电容中；以及
    控制所述第一双向DC-DC变换器以将所述可再生能源发电装置两端的电压变换为预定的直流母线电压，且控制所述第二双向DC-DC变换器以利用所述储能电容上的电能对所述可充电电池进行充电。
  13. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，所述混合电源系统包括与交流电源串联的旁路开关，其特征在于，当所述可再生能源发电装置不提供电能，且所述可充电电池中的电能小于预定的阈值时，所述控制器用于：
    控制所述开关组使得所述第一和第二双向DC-DC变换器的输入端连接至所述可充电电池的两端；
    控制所述旁路开关闭合以使得所述交流电源中的交流电整流后储存在所述储能电容中；以及
    控制所述第一和第二双向DC-DC变换器以利用所述储能电容上的电能对所述可充电电池进行充电。
  14. 根据权利要求7所述的用于混合电源系统的组合DC-DC变换器，其特征在于，所述组合DC-DC变换器还包括：
    与第一双向DC-DC变换器并联的第三双向DC-DC变换器，所述控制器以相同的工作模式控制所述第一和第三双向DC-DC变换器；或
    与所述第二双向DC-DC变换器并联的第四双向DC-DC变换器，所述控制器以相同的工作模式控制第二和第四双向DC-DC变换器。
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