CN110224589B - Power supply boosting device based on multistage energy storage unit series connection - Google Patents
Power supply boosting device based on multistage energy storage unit series connection Download PDFInfo
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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
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to the field of photovoltaic power generation, and provides a power supply boosting device based on series connection of multistage energy storage units. The power supply comprises a power supply U p, a main inductor L 0, a main switch S 0, an energy storage unit and a load; the energy storage unit consists of a first energy storage unit, a second energy storage unit and 4n energy storage units, wherein the positive electrode of the power supply U p is connected with one end of the main inductor L 0, and the negative electrode of the power supply U p is connected with the other end of the main switch S 0 and the input end IN ‑ of the first energy storage unit; the output end OUT + of the last energy storage unit 4n is connected with the positive input end of the load, and the output end OUT ‑ is connected with the negative input end of the load; because the energy storage units are cascaded in a series structure, the boosting capacitor in each energy storage unit is overlapped to achieve boosting; the device has the characteristics of simple topological structure, stable boosting and high energy storage efficiency, and is suitable for a distributed energy system.
Description
Technical Field
The invention relates to a photovoltaic cell assembly voltage regulating device, which is mainly applied to the field of photovoltaic power generation, in particular to a power supply boosting device based on multistage energy storage unit series connection.
Background
With the importance of China on green energy, distributed energy systems are getting more attention. The solar photovoltaic energy and fan energy industries are used as supply industries of future energy, and the development of the solar photovoltaic energy and fan energy industries has important practical significance and strategic significance under the promotion of national power. In practical use, electricity generated by a solar photovoltaic power station or a fan power station needs to be integrated into a national power grid through a grid-connected technology, and a power electronic inverter is an indispensable grid-connected device. However, in the distributed energy system, the output voltage of the photovoltaic cell assembly or the fan power station has great change along with the change of illumination and wind speed conditions, and the output voltage has frequent fluctuation and amplitude which is greatly lower than the requirement of the grid-connected inverter. In order to better perform grid connection, in order to better realize grid connection power generation, a step-up converter with high efficiency, high gain and stable performance needs to be added between a solar photovoltaic power station or a fan power station and a grid connection inverter, and a power electronic technology is utilized to convert low voltage into stable and high-amplitude direct current suitable for the grid connection inverter.
Of the power electronic converters, the conventional Boost converter is most suitable for use as a Boost converter. However, the Boost range of the traditional Boost converter is not large, and the traditional Boost converter is not suitable for a distributed energy system which can be operated by the high-gain Boost converter. Patent CN201720617267.4 proposes a high step-up ratio converter based on a voltage doubling unit, a diode and a capacitor are utilized to form the voltage doubling unit, and the voltage is doubled by the series voltage doubling unit, so as to realize a high-gain step-up converter. Because the boosting unit only adopts a capacitor as an energy storage element, the energy storage capacity is poor, and the boosting unit is not suitable for a distributed energy system which needs to transmit high power. Patent CN201320575088.0 proposes a non-series cascaded N-type converter, which uses 2 diodes, 1 inductor and one capacitor to form a Boost unit, and forms a variable impedance Boost converter by connecting N Boost units in series. The method can work under high power conditions, but the regulation strategy of the method is realized on the converter side, so that the method is only suitable for a distributed energy system which is specially designed in a specific application.
In the design of practical distributed energy systems, grid-connected inverters are usually commercial power electronic inverters, that is, it is impossible to implement a boost conversion strategy at the inverter end, so that it is necessary to find a high-gain boost converter topology for performing boost conversion control at the power end to meet the needs of practical application of the distributed energy systems.
Disclosure of Invention
The invention aims to provide a direct current converter with high gain, which adopts a power supply boosting device formed by connecting a plurality of energy storage units in series.
The power supply boosting device based on the series connection of the multi-stage energy storage units comprises a power supply U p, a main inductor L 0, a main switch S 0, the energy storage units and a load; the energy storage unit consists of a first energy storage unit, a second energy storage unit and 4n energy storage units, wherein the first energy storage unit consists of a switch S 1, an inductor L 1, a boosting capacitor C 11 and an energy storage capacitor C 21, one end of the switch S 1 is connected with one end of the boosting capacitor C 11 to form an input end IN + of the energy storage unit, the other end of the boosting capacitor C 11 is connected with one end of the inductor L 1, an output end OUT + of the energy storage unit is formed, one end of an energy storage capacitor C 21 is connected with the other end of a switch S 1 and the other end of an inductor L 1, the other end of the energy storage capacitor C 21 is respectively used as an input end IN-and an output end OUT-of the energy storage unit, the connection mode and the structure of the second energy storage unit and 4n energy storage units are adopted, and the like;
The positive electrode of the power supply U p is connected with one end of a main inductor L 0, and the other end of the main inductor L 0 is connected with one end of a main switch S 0 and the input end IN + of the first energy storage unit; the negative pole of the power supply U p is connected with the other end of the main switch S 0 and the input end IN-of the first energy storage unit; the output OUT + of the first energy storage unit is connected to the input IN + of the second energy storage unit, the output OUT-of the first energy storage unit is connected to the input IN-of the second energy storage unit, the way IN which the other energy storage units are connected, and so on; the output end OUT + of the last energy storage unit 4n is connected with the positive input end of the load, and the output end OUT-is connected with the negative input end of the load;
The energy storage unit consists of two operating states: when the switch S 1 is opened, the energy stored in the energy storage capacitor C 21 is injected into the inductor L 1 and the boost capacitor C 11, and the magnetic field energy is increased, which is called a magnetizing state; when the switch S 1 is closed, the input end injects current i in to supplement energy to the boost capacitor C 11, meanwhile, the inductor L 1 outputs current i out to the output end, and the magnetic field energy is reduced, which is called a demagnetizing state; the working process is as follows: in a working period T, the main switch S 0 is turned on once and turned off once, the on time is defined as DT, and the off time is (1-D) T;
When the main switch S 0 is turned on, the switches in each energy storage unit are turned off, the device enters a magnetizing state, one end of the main inductor L 0 is grounded by the main switch S 0, the power supply U p injects energy into the main inductor L 0, and the magnetic field energy of the main inductor L 0 is increased; the switch S 1 of the first energy storage unit is turned off, the energy storage capacitor C 21 discharges to the inductor L 1 and the boost capacitor C 11, and the magnetic field energy of the inductor L 1 is increased; the switch S 2 of the second energy storage unit is opened, the energy storage capacitor C 22 discharges to the inductor L 2, the boost capacitor C 12 and the boost capacitor C 11 of the first energy storage unit, and the magnetic field energy of the inductor L 2 of the second energy storage unit is increased; the operation of other energy storage units, and so on;
When the main switch S 0 is turned off, the switches in the energy storage units are turned on, the device enters a demagnetizing state, the magnetic field energy injected into the main inductor L 0 is reduced, and an output current is formed and is transmitted to the first energy storage unit; the switch S 1 of the first energy storage unit is conducted, the current injected into the first energy storage unit charges the energy storage capacitor C 21, meanwhile, the inductor L 1 and the boost capacitor C 11 are discharged, the magnetic field energy of the inductor L 1 is reduced, and an output current is formed and is transmitted to the second energy storage unit; the operation of the other energy storage units is the same, and so on.
The inductive currents of the energy storage unit in the magnetizing state and the demagnetizing state are obtained according to the analysis of the relation between the output voltage U out and the input voltage U in:
the inductance currents in the magnetizing state are as follows:
the inductor currents in the demagnetizing state are as follows:
According to the principle that the magnetizing state energy is equal to the demagnetizing state energy, the method can be obtained according to a magnetizing state equation (1) and a demagnetizing state equation (2):
Simultaneous equations (3) and (4), solving to obtain:
The power supply U p is a photovoltaic battery piece or a wind driven generator.
The switch is a triode, a MOSFET field effect transistor, an IGBT or a diode.
The load is a direct current inverter or a photovoltaic inverter.
The technical scheme of the invention has the beneficial effects that: the energy storage unit has two working states of magnetizing and demagnetizing, in the magnetizing state, the energy storage capacitor injects energy into the boost capacitor and the energy storage inductor, the magnetic field energy is increased, and the voltage of the boost capacitor is increased; in the demagnetizing state, the input end injects current to inject energy into the energy storage capacitor, so that the electric field energy of the energy storage capacitor is increased; because the energy storage units are cascaded in a series structure, the boosting capacitor in each energy storage unit is overlapped to achieve boosting; the device has the characteristics of simple topological structure, stable boosting and high energy storage efficiency, and is suitable for a distributed energy system.
Drawings
Fig. 1 is a schematic circuit topology of an embodiment of the present invention.
Fig. 2 is a schematic circuit topology of an energy storage unit according to the present invention, wherein fig. 2a is a schematic circuit diagram of a magnetizing state, and fig. 2b is a schematic circuit diagram of a demagnetizing state.
Fig. 3 is a schematic diagram of the circuit operation of the circuit structure in the magnetizing state.
Fig. 4 is a schematic diagram of the circuit operation of the circuit structure in the demagnetized state.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
Referring to fig. 1 to 4, a power supply boosting device based on a multi-stage energy storage unit series connection comprises a power supply U p (1), a main inductor L 0 (2), a main switch S 0 (3), an energy storage unit (4) and a load (5); the energy storage unit (4) is composed of a first energy storage unit (41), a second energy storage unit (42) and energy storage units (4 n) (n is a natural number not less than 1), wherein the first energy storage unit (41) is composed of a switch S 1, an inductor L 1, a boost capacitor C 11 and an energy storage capacitor C 21; one end of the switch S 1 is connected with one end of the boost capacitor C 11 to form an input end IN + of the energy storage unit; the other end of the boost capacitor C 11 is connected with one end of the inductor L 1 to form an output end OUT + of the energy storage unit; one end of the energy storage capacitor C 21 is connected with the other end of the switch S 1 and the other end of the inductor L 1; the other end of the energy storage capacitor C 21 is respectively used as an input end IN-and an output end OUT-of the energy storage unit; the manner and configuration of connection of the second energy storage unit (42) and the energy storage unit 4n, and so on;
The positive electrode of the power supply U p (1) is connected with one end of the main inductor L 0 (2), and the other end of the main inductor L 0 (2) is connected with one end of the main switch S 0 (3) and the input end IN + of the first energy storage unit (41); the negative pole of the power supply U p is connected with the other end of the main switch S 0 (3) and the input end IN-of the first energy storage unit (41); the output OUT + of the first energy storage unit (41) is connected to the input IN + of the second energy storage unit (42), the output OUT-of the first energy storage unit (41) is connected to the input IN-of the second energy storage unit (42), and the other energy storage units are connected IN the same way; the output ends OUT + of the last energy storage unit 4n are connected with the positive input end of the load (5), and the output ends OUT-are connected with the negative input end of the load (5);
The energy storage unit (4) consists of two operating states: when the switch S 1 is opened, the energy stored in the energy storage capacitor C 21 is injected into the inductor L 1 and the boost capacitor C 11, and the magnetic field energy is increased, which is called a magnetizing state; when the switch S 1 is closed, the input end injects current i in to supplement energy to the boost capacitor C 11, meanwhile, the inductor L 1 outputs current i out to the output end, and the magnetic field energy is reduced, which is called a demagnetizing state; the working process is as follows: in a working period T, the main switch S 0 (3) is turned on once and turned off once, the on time is defined as DT, and the off time is (1-D) T;
When the main switch S 0 (3) is turned on, the switches in the energy storage units are turned off, the device enters a magnetizing state, one end of the main switch S 0 is grounded to the main inductor L 0 (2), the power supply U p (1) injects energy into the main inductor L 0 (2), and the magnetic field energy of the main inductor L 0 (2) is increased; the switch S 1 of the first energy storage unit (41) is opened, the energy storage capacitor C 21 discharges to the inductor L 1 and the boost capacitor C 11, and the magnetic field energy of the inductor L 1 is increased; the switch S 2 of the second energy storage unit (42) is opened, the energy storage capacitor C 22 discharges to the inductor L 2, the boost capacitor C 12 and the boost capacitor C 11 of the first energy storage unit (41), and the magnetic field energy of the inductor L 2 of the second energy storage unit (42) is increased; the operation of other energy storage units, and so on.
When the main switch S 0 (3) is turned off, the switch S 1 and the switch S 2·. Switch S n in each energy storage unit are turned on, the device enters a demagnetizing state, the magnetic field energy injected into the main inductor L 0 (2) is reduced, and an output current is formed and is transmitted to the first energy storage unit; the switch S 1 of the first energy storage unit (41) is conducted, the current injected into the first energy storage unit charges the energy storage capacitor C 21, meanwhile, the inductor L 1 and the boost capacitor C 11 discharge, the magnetic field energy of the inductor L 1 is reduced, and the output current is formed and is transmitted to the second energy storage unit; the operation of the other energy storage units is the same, and so on.
The power supply U p can be a photovoltaic battery piece, a wind driven generator and other green energy sources.
The switch S 0, the switch S 1 and the switch S 2 switch S n are triodes, MOSFET field effect transistors, IGBT tubes or diodes.
The load is a direct current inverter or a photovoltaic inverter.
Referring to fig. 2, fig. 2a is a circuit diagram of the energy storage unit in a magnetizing state, where the switch S 1 is in an on state, energy in the storage capacitor C 21 is discharged to the inductor L 1 and the boost capacitor C 11, current in the inductor rises, and magnetic field energy increases. Fig. 2b is a circuit diagram of the energy storage unit in the demagnetized state, where the switch S 1 is in the on state, the externally injected current i in charges the energy storage capacitor C 21, the electric field energy in the energy storage capacitor C 21 is increased, and the magnetic field energy in the energy storage inductor is reduced, so as to form the output current i out.
Referring to fig. 3, fig. 3 is a schematic diagram of a complete circuit structure of a power boosting device based on a series connection of multiple stages of energy storage units in a magnetized state. The main switch S 0 is turned on, and the switches S 1 and S 2 switch S n in the respective energy storage units are turned off. The input voltage injects energy into the main inductance L 0 through the main switch S 0, and the magnetic field energy in the main inductance L 0 increases. In the first energy storage unit, the energy storage capacitor C 21 discharges to the inductor L 1 and the boost capacitor C 11, and the magnetic field energy in the inductor L 1 increases. The other energy storage units operate the same as the first energy storage unit. Under the magnetizing state, the current expression in each energy storage inductor is as follows:
Referring to fig. 4, fig. 4 is a schematic diagram of a complete circuit structure of a power boosting device based on a series connection of multiple stages of energy storage units in a demagnetized state. The main switch S 0 is turned off, and the switches S 1 and S 2 switch S n in the respective energy storage units are turned on. The main inductance L 0 reduces the magnetic field energy, resulting in an output current that injects energy into the first energy storage unit. In the first energy storage unit, the injection current injects energy into the energy storage capacitor C 21, and the electric field energy in the energy storage capacitor C 21 increases. The magnetic field energy in the inductor L 1 is reduced, and the output current is formed to output energy to the next stage circuit. The other energy storage units operate the same as the first energy storage unit. In the demagnetizing state, the current expression in each energy storage inductor is as follows:
According to the principle of energy conservation, the energy in the magnetizing state of the system is equal to the energy in the demagnetizing state, so that the corresponding currents in the formulas (6) and (7) can be equal to obtain the following equation set:
solving equations (8) and (9) simultaneously to obtain a voltage gain expression of the boosting system;
Equation 10 shows that the output voltage U out is greater than the input voltage U in, the system is a boost circuit, and the system gain can be adjusted by adjusting the parameters n, D.
The technical scheme of the invention has the beneficial effects that: the energy storage unit has two working states of magnetizing and demagnetizing, in the magnetizing state, the energy storage capacitor injects energy into the boost capacitor and the energy storage inductor, the magnetic field energy is increased, and the voltage of the boost capacitor is increased; in the demagnetizing state, the input end injects current to inject energy into the energy storage capacitor, so that the electric field energy of the energy storage capacitor is increased; because the energy storage units are cascaded in a series structure, the boosting capacitor in each energy storage unit is overlapped to achieve boosting; the device has the characteristics of simple topological structure, stable boosting and high energy storage efficiency, and is suitable for a distributed energy system.
Claims (1)
1. Power boost device based on multistage energy storage unit series connection, its characterized in that: the power supply comprises a power supply U p, a main inductor L 0, a main switch S 0, an energy storage unit and a load; the energy storage unit consists of a first energy storage unit, a second energy storage unit and 4n energy storage units, wherein the first energy storage unit consists of a switch S 1, an inductor L 1, a boosting capacitor C 11 and an energy storage capacitor C 21, one end of the switch S 1 is connected with one end of the boosting capacitor C 11 to form an input end IN + of the energy storage unit, the other end of the boosting capacitor C 11 is connected with one end of the inductor L 1, an output end OUT + of the energy storage unit is formed, one end of an energy storage capacitor C 21 is connected with the other end of a switch S 1 and the other end of an inductor L 1, the other end of the energy storage capacitor C 21 is respectively used as an input end IN-and an output end OUT-of the energy storage unit, and the connection and the constitution of the second energy storage unit and 4n energy storage units are the same as those of the first energy storage unit; the positive electrode of the power supply U p is connected with one end of a main inductor L 0, and the other end of the main inductor L 0 is connected with one end of a main switch S 0 and the input end IN + of the first energy storage unit; the negative pole of the power supply U p is connected with the other end of the main switch S 0 and the input end IN-of the first energy storage unit; the output OUT + of the first energy storage unit is connected to the input IN + of the second energy storage unit, the output OUT-of the first energy storage unit is connected to the input IN-of the second energy storage unit, and the other energy storage units are also connected IN the manner described above; the output end OUT + of the last energy storage unit 4n is connected with the positive input end of the load, and the output end OUT-is connected with the negative input end of the load; the energy storage unit consists of two operating states: when the switch S 1 is opened, the energy stored in the energy storage capacitor C 21 is injected into the inductor L 1 and the boost capacitor C 11, and the magnetic field energy is increased, which is called a magnetizing state; when the switch S 1 is closed, the input end injects current i in to supplement energy to the boost capacitor C 11, meanwhile, the inductor L 1 outputs current i out to the output end, and the magnetic field energy is reduced, which is called a demagnetizing state; the working process is as follows: in a working period T, the main switch S 0 is turned on once and turned off once, the on time is defined as DT, and the off time is (1-D) T; when the main switch S 0 is turned on, the switches in each energy storage unit are turned off, the device enters a magnetizing state, one end of the main inductor L 0 is grounded by the main switch S 0, the power supply U p injects energy into the main inductor L 0, and the magnetic field energy of the main inductor L 0 is increased; the switch S 1 of the first energy storage unit is turned off, the energy storage capacitor C 21 discharges to the inductor L 1 and the boost capacitor C 11, and the magnetic field energy of the inductor L 1 is increased; the switch S 2 of the second energy storage unit is opened, the energy storage capacitor C 22 discharges to the inductor L 2, the boost capacitor C 12 and the boost capacitor C 11 of the first energy storage unit, and the magnetic field energy of the inductor L 2 of the second energy storage unit is increased; other energy storage units also operate as described above; when the main switch S 0 is turned off, the switches in the energy storage units are turned on, the device enters a demagnetizing state, the magnetic field energy injected into the main inductor L 0 is reduced, and an output current is formed and is transmitted to the first energy storage unit; the switch S 1 of the first energy storage unit is conducted, the current injected into the first energy storage unit charges the energy storage capacitor C 21, meanwhile, the inductor L 1 and the boost capacitor C 11 are discharged, the magnetic field energy of the inductor L 1 is reduced, and an output current is formed and is transmitted to the second energy storage unit; other energy storage units also operate as described above; the power supply U p is a photovoltaic battery piece or a wind driven generator; the switch is a triode, a MOSFET field effect transistor, an IGBT or a diode; the load is a direct current inverter or a photovoltaic inverter; the inductive currents of the energy storage unit in the magnetizing state and the demagnetizing state are obtained according to the analysis of the relation between the output voltage U out and the input voltage U in: the inductance currents in the magnetizing state are as follows:
the inductor currents in the demagnetizing state are as follows:
According to the principle that the magnetizing state energy is equal to the demagnetizing state energy, the method can be obtained according to a magnetizing state equation (1) and a demagnetizing state equation (2):
Simultaneous equations (3) and (4), solving to obtain:
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| CN105958816A (en) * | 2016-05-30 | 2016-09-21 | 西安交通大学 | Multi-unit diode capacitor network and coupling inductor high-gain DC converter |
| CN107276397A (en) * | 2017-06-18 | 2017-10-20 | 天津大学 | A kind of single tube wide scope voltage boosting dc converter for fuel cell |
| CN107733221A (en) * | 2017-10-30 | 2018-02-23 | 西安交通大学 | A kind of multiple-unit coupling inductance switched capacitor network high-gain DC converter |
| CN207706052U (en) * | 2017-11-22 | 2018-08-07 | 天津运筹天下科技有限公司 | Booster circuit |
| CN107994770A (en) * | 2018-01-09 | 2018-05-04 | 青岛大学 | Single-stage current type converter with series multistage switch L.C. network |
| CN108539983A (en) * | 2018-04-19 | 2018-09-14 | 西安交通大学 | A kind of two-way circuit of reversed excitation of small-sized fast charging and discharging |
| CN209748408U (en) * | 2019-05-14 | 2019-12-06 | 厦门银固美能源科技有限公司 | power supply boosting device based on multi-stage energy storage unit series connection |
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