CN110620377B - Three-port DC-DC converter for energy efficient transmission and control method thereof - Google Patents
Three-port DC-DC converter for energy efficient transmission and control method thereof Download PDFInfo
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- CN110620377B CN110620377B CN201910868828.1A CN201910868828A CN110620377B CN 110620377 B CN110620377 B CN 110620377B CN 201910868828 A CN201910868828 A CN 201910868828A CN 110620377 B CN110620377 B CN 110620377B
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- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
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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
- H02M3/1582—Buck-boost converters
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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
Abstract
The invention relates to a three-port DC-DC converter applied to efficient energy transmission of a photovoltaic power generation system and a control method thereof, and belongs to the technical field of photovoltaic power generation. The photovoltaic power generation system comprises a photovoltaic solar battery, an energy storage battery, a phase-shifting full-bridge converter and a direct-current bus, wherein the circuit topology structure is the phase-shifting full-bridge converter of the multiplexing primary-side bridge side switching tube. The input of the phase-shifting full-bridge converter is connected with the direct current bus, the output of the phase-shifting full-bridge converter is connected with the photovoltaic cell in series and connected with the direct current bus, the output voltage of the phase-shifting full-bridge converter compensates the difference value between the voltage of the direct current bus and the voltage of the photovoltaic cell, and the photovoltaic cell is in a maximum power obtaining state. The charge and discharge current of the storage battery is regulated by regulating the duty ratio of the primary bridge arm switch tube of the phase-shifting full-bridge converter, and the stability of the voltage of the direct-current bus is maintained. The topology structure can remarkably improve the efficiency of the whole photovoltaic power generation system on the basis of maintaining the voltage stability of the direct current bus and the acquisition of the photovoltaic maximum power, and has wide application prospect.
Description
Technical Field
The invention relates to a three-port DC-DC converter applied to efficient energy transmission of a photovoltaic power generation system and a control method thereof, and belongs to the technical field of photovoltaic power generation.
Background
With the increase in human resource consumption and the decrease in non-renewable resources on earth, new alternative energy sources are being sought for human beings worldwide. Solar energy is taken as a renewable energy source and has a great development space. However, the photovoltaic cell itself has a problem of low energy conversion efficiency, and it is important how to improve the efficiency of the whole photovoltaic power generation system.
The photovoltaic power generation system mainly comprises a photovoltaic solar panel, an energy storage battery, a power electronic converter and a direct current bus. The whole system can realize the maximum acquisition control of the output power of the solar photovoltaic cell; when the illumination is sufficient, energy can be supplied to the direct current bus and redundant energy can be transmitted to the energy storage battery to keep the voltage of the direct current bus stable. When the illumination is insufficient, the solar photovoltaic cell is ensured to be in a maximum power acquisition state, and meanwhile, the storage battery releases energy to ensure the stability of the voltage of the direct current bus. The traditional photovoltaic power generation system generally adopts a Boost converter to obtain the maximum power of the photovoltaic cell, and has simple structure and higher efficiency. However, energy generated by photovoltaic power generation can be converged into a direct current bus through a Boost converter, and certain energy loss exists. In addition, the Boost converter has the problem that the working efficiency and the output power of the photovoltaic cell are not well matched, and the power conversion efficiency of the whole system is affected.
Disclosure of Invention
The invention aims to provide a three-port DC-DC converter applied to efficient energy transmission of a photovoltaic power generation system and a control method thereof, aiming at achieving photovoltaic maximum power acquisition and keeping direct current bus voltage stable.
The purpose of the invention is realized in the following way: a three-port DC-DC converter for high-efficiency energy transmission of photovoltaic power generation system is composed of high-frequency transformer HFT and switch tube S 1 -S 4 Primary side full-bridge converter of phase-shifting full-bridge converter formed by diode D 1 -D 4 Uncontrolled rectifier bridge and filter inductance L o Filter capacitor C o Composition; the photovoltaic solar battery string is connected with the output of the phase-shifting full-bridge converter in series and connected with a direct current bus, the input of the phase-shifting full-bridge converter is directly connected with the direct current bus, and the energy storage battery is connected with the direct current bus through a double Buck-Boost converter formed by multiplexing a primary side switching tube of the phase-shifting full-bridge converter.
The invention also includes such structural features:
1. the primary bridge arm switching tubes S1, S3, S2 and S4 are complementarily conducted, the duty ratio is adjustable, the duty ratio of the switching tubes S1 and S2 is the same, the duty ratio of the switching tubes S3 and S4 is the same, and the phase angle between the bridge arms LegA and LegB of the primary full-bridge converter is
2. The energy storage battery is provided with two inductors L with the same size bat1 、L bat2 Respectively connected to two midpoints A, B of the primary legs of the phase-shifted full-bridge converter.
3. Output voltage U of phase-shifting full-bridge converter o DC bus voltage U bus Two-terminal voltage U of photovoltaic cell string pv Meeting U between pv ＝U bus -U o While the output voltage U of the phase-shifted full-bridge converter o And input voltage U bus Meeting U between o ＝αU bus U, i.e. U pv ＝U bus -αU bus 。
4. A three-port DC-DC converter control method applied to efficient energy transmission of a photovoltaic power generation system specifically comprises the following steps:
step 1, initializing a system in an initial stage of power-on of the system, and setting the output of a photovoltaic cell MPPT controller and a direct current bus voltage controller in a program to be 0;
step 2, collecting a voltage sensor VSA to obtain a direct current bus voltage value u bus The collected voltage and the set voltage value u * bus Comparing them to obtain deviation signal Deltau bus Input to the controller G bus And limiting the output of the controller, wherein the output is used as a duty ratio control signal d of a primary bridge arm switch tube bus ；
Step 3, collecting a voltage sensor VSB to obtain a photovoltaic string voltage value u pv Collecting a current sensor CSA to obtain a photovoltaic output current value i pv According to the collected photovoltaic cell output voltage and output current, obtaining a given value u of the solar panel terminal voltage by utilizing an MPPT algorithm * pv ；
Step 4, outputting the collected photovoltaic cell output voltage u pv And a given voltage value u obtained by MPPT algorithm * pv Difference, deviation Deltau pv Is sent to the controller G pv The output is used as the phase-shift angle control signal between the primary bridge arms of the phase-shift full-bridge converter after operation
Step 5, d bus As modulation signal for PWM modulation, amplitude V is adopted M Is used as a bridge arm LegA carrier signal to generate a duty cycle d 1 The pulse sequence is used for driving a lower switching tube S of a primary bridge arm LegA of the phase-shifting full-bridge converter 3 Switch tube S on bridge arm 1 Under-bridge switching tube S 3 Complementary turn-on, duty cycle of (1-d 1 )；
Step 6, lagging angle of bridge arm LegA carrier signal
Will d bus As the modulation signal, an amplitude of V is adopted M Is used as carrier wave to generate a duty ratio d 1 The pulse sequence is used for driving a lower switching tube S of a primary bridge arm LegB of the phase-shifting full-bridge converter 4 Switch tube S on bridge arm 2 Under-bridge switching tube S 4 Complementary turn-on, duty cycle of (1-d 1 )；
And 7, repeatedly executing the steps 2 to 6 under the condition that the shutdown instruction is not obtained, and exiting the running state when the shutdown instruction is received.
Compared with the prior art, the invention has the beneficial effects that: the DC-DC converter provided by the invention can realize the following functions: the maximum power acquisition control of the photovoltaic cell is realized by adjusting the phase shift angle between the primary bridge arms of the phase shift full-bridge converter. The charge and discharge control of the energy storage battery is realized by adjusting the duty ratio of the primary bridge arm switch tube of the phase-shifting full-bridge converter, so that the stability of the voltage of the direct current bus is maintained. Most of energy generated by the photovoltaic cell can be directly transmitted to the direct current bus, no intermediate power conversion link exists, and the efficiency of the whole power generation system is obviously improved. The phase-shifting full-bridge converter is used as a power compensator, and the transmitted power occupies only a small part of the power compensator, so that the size of the converter is effectively reduced.
The energy storage battery is connected to the middle points of the two bridge arms of the primary side through two identical inductors, is connected with the direct current bus through a switching tube of the multiplexing primary side bridge arm, and maintains the stability of the direct current bus voltage by adjusting the duty ratio of the switching tube of the primary side bridge arm, so that the charge and discharge management of the energy storage battery is realized. The photovoltaic cell string and the output of the phase-shifting full-bridge converter are connected in series to a direct-current bus, most of energy generated by the photovoltaic cell string and the output of the phase-shifting full-bridge converter are directly converged into the direct-current bus through a secondary side uncontrolled diode rectifier bridge and an LC filter of the phase-shifting full-bridge converter, an intermediate power conversion link is omitted, the transmission efficiency is remarkably improved, and the loss in the transmission process is reduced. Meanwhile, the phase-shifting full-bridge converter is used as a power compensator, and the energy transmitted by the phase-shifting full-bridge converter is only a small part of the total energy transmitted, so that the loss in the transmission process is reduced, and the capacity and the volume of the high-frequency transformer are reduced.
In the photovoltaic power generation system, a photovoltaic solar battery string is connected in series with the output of a phase-shifting full-bridge converter, a direct current bus is connected to the photovoltaic solar battery string, the input of the phase-shifting full-bridge converter is directly connected with the direct current bus, and an energy storage battery is connected with the direct current bus through a double Buck-Boost converter formed by multiplexing a primary side switching tube of the phase-shifting full-bridge converter. The maximum power acquisition control of the photovoltaic battery is realized by adjusting the phase shift angle of the primary bridge arm of the phase shift full-bridge converter, and the stability of the DC bus voltage is maintained by adjusting the duty ratio of the switching tube of the primary bridge arm. Most of energy generated by the photovoltaic cell can be directly converged on the direct current bus without an intermediate power conversion link, so that the efficiency is remarkably improved, the phase-shifting full-bridge converter is used as a power compensator, and the transmitted power only occupies a small part of the power compensator, so that the volume of the converter is effectively reduced.
Drawings
FIG. 1 is a topological structure diagram of a high efficiency DC-DC converter for use in a photovoltaic power generation system;
FIG. 2 is a schematic diagram of a high efficiency three port DC-DC converter control strategy;
FIG. 3 is a waveform diagram of the output power of each port of the high efficiency three port DC-DC converter;
fig. 4 is a flowchart of the execution of the steady operation of the photovoltaic power generation system.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
The main circuit topology structure in figure 1 is a phase-shifting full-bridge converter multiplexing primary-side bridge side switching tubes, which mainly consists of a high-frequency transformer HFT and a switching tube S 1 -S 4 The primary side full bridge converter of the phase-shifting full bridge converter consists of a diode D 1 -D 4 Uncontrolled rectifier bridge and filter inductance L o Filter capacitor C o Composition is prepared. Wherein, the primary bridge arm switching tubes S1, S3, S2 and S4 are complementarily conducted, the duty ratio is adjustable, the duty ratio of the switching tubes S1 and S2 is the same, and the duty ratio of S3 and S4 is the sameThe phase angle between the bridge arms LegA and LegB of the primary full-bridge converter is the same
The energy storage battery is provided with two inductors L with the same size bat1 、L bat2 The photovoltaic cell strings are respectively connected to two midpoints A, B of a primary bridge arm of the phase-shifting full-bridge converter, the photovoltaic cell strings are connected with the output of the phase-shifting full-bridge converter in series, the photovoltaic cell strings are connected to a DC bus, and the input of the phase-shifting full-bridge converter is directly connected to the DC bus. Wherein i is pv For the output current of the string of photovoltaic cells, U pv For the output voltage of the string of photovoltaic cells, U bus Is the voltage value of the direct current bus.
The principle of the topology structure for realizing the maximum power acquisition of the photovoltaic cell is that the photovoltaic cell string and the output phase of the phase-shifting full-bridge converter are connected in series and connected into a direct current bus, so that the output voltage U of the phase-shifting full-bridge converter is realized o DC bus voltage U bus Two-terminal voltage U of photovoltaic cell string pv Between which U should be satisfied pv ＝U bus -U o While the output voltage U of the phase-shifted full-bridge converter o And input voltage U bus Between which U should be satisfied o ＝αU bus U, i.e. U pv ＝U bus -αU bus Thus, when the DC bus voltage is stabilized at the set value, the output voltage u to the photovoltaic cell string pv And output current i pv Sampling, determining a terminal voltage value obtained by photovoltaic maximum power through a maximum power tracking algorithm, and outputting voltage alpha U through a phase-shifting full-bridge converter bus Thereby enabling maximum power tracking control of the string of photovoltaic cells.
With reference to fig. 1 and fig. 2, the specific application scheme of the high-efficiency DC-DC converter provided by the invention is as follows:
step 1, firstly, in the initial stage of system power-on, software and hardware initialization work related to system control is carried out, wherein the important work is that the output of a photovoltaic cell MPPT controller and a direct current bus voltage controller in a program are set to be 0;
step 2, pickingThe collector voltage sensor VSA can obtain the voltage value u of the direct current bus bus The collected voltage and the set voltage value u * bus Comparing them to obtain deviation signal Deltau bus Input to the controller G bus And limiting the output of the controller, wherein the output is used as a duty ratio control signal d of a primary bridge arm switch tube bus ；
Step 3, collecting the voltage value u of the photovoltaic string obtained by the voltage sensor VSB pv The acquisition current sensor CSA can obtain a photovoltaic output current value i pv According to the collected photovoltaic cell output voltage and output current, obtaining a given value u of the solar panel terminal voltage by utilizing an MPPT algorithm * pv ；
Step 4, outputting the collected photovoltaic cell output voltage u pv And a given voltage value u obtained by MPPT algorithm * pv Difference, deviation Deltau pv Is sent to the controller G pv The output is used as the phase-shift angle control signal between the primary bridge arms of the phase-shift full-bridge converter after operation
Step 5, d bus As modulation signal for PWM modulation, amplitude V is adopted M Is used as a bridge arm LegA carrier signal to generate a duty cycle d 1 The pulse sequence is used for driving a lower switching tube S of a primary bridge arm LegA of the phase-shifting full-bridge converter 3 Switch tube S on bridge arm 1 Under-bridge switching tube S 3 Complementary turn-on, duty cycle of (1-d 1 )；
Step 6, lagging angle of bridge arm LegA carrier signal
Will d bus As modulation signal, amplitude V is also adopted M Is used as carrier wave to generate a duty ratio d 1 The pulse sequence is used for driving a lower switching tube S of a primary bridge arm LegB of the phase-shifting full-bridge converter 4 Switch tube S on bridge arm 2 Under-bridge switching tube S 4 Complementary turn-on, duty cycle of (1-d 1 )。
And 7, repeatedly executing the steps (2) - (6) under the condition that the shutdown instruction is not obtained, and exiting the running state after receiving the shutdown instruction.
One specific example provided by the invention is as follows:
voltage at maximum power point of solar photovoltaic cell string: 200V; the end voltage of the energy storage battery is 120V; outputting 240V of direct current bus voltage; output power: 3.85KW; the switching frequency of the phase-shifted full-bridge converter is 20kHz.
The waveform diagram shown in fig. 3 is a waveform diagram of output power of each port of the photovoltaic power generation system, and it can be seen from the diagram that when the output power of the photovoltaic battery is reduced (from 5125W to 3575W), the output power on the direct current bus is stabilized at 3.84KW within 0.06s, the voltage of the direct current bus can be kept stable, the storage battery is changed from a charging state to a discharging state, the power transmitted by the phase-shifting full-bridge converter is changed from 1025W to 700W, and the phase-shifting full-bridge converter only accounts for about 20% of the total power transmitted.
In summary, the invention provides a high-efficiency three-port DC-DC converter which is applied to a photovoltaic power generation system to achieve photovoltaic maximum power acquisition and keep direct current bus voltage stable and a control method thereof. The photovoltaic power generation system consists of a photovoltaic solar cell, an energy storage battery, a phase-shifting full-bridge converter and a direct current bus. The DC-DC converter can ensure that most of energy generated by photovoltaic power generation can be directly transmitted to the direct current bus, and the transmission efficiency of the whole system can be remarkably improved. The input of the phase-shifting full-bridge converter is connected with the direct current bus, the output of the phase-shifting full-bridge converter is connected with the photovoltaic cell in series and connected with the direct current bus, the output voltage of the phase-shifting full-bridge converter compensates the difference value between the voltage of the direct current bus and the voltage of the photovoltaic cell, and the photovoltaic cell is in a maximum power obtaining state. The charge and discharge current of the storage battery is regulated by regulating the duty ratio of the primary bridge arm switch tube of the phase-shifting full-bridge converter, and the stability of the voltage of the direct-current bus is maintained. The topology structure can remarkably improve the efficiency of the whole photovoltaic power generation system on the basis of maintaining the voltage stability of the direct-current bus and the acquisition of the photovoltaic maximum power.
Claims (5)
1. A three-port DC-DC converter with high-efficiency energy transmission comprises a high-frequency transformer HFT and a switching tube S, wherein the three-port DC-DC converter has a circuit topology structure of a phase-shifting full-bridge converter multiplexing primary-side bridge-side switching tubes 1 -S 4 Primary side full-bridge converter of phase-shifting full-bridge converter formed by diode D 1 -D 4 Uncontrolled rectifier bridge and filter inductance L o Filter capacitor C o The method comprises the steps of carrying out a first treatment on the surface of the The method is characterized in that: the photovoltaic solar battery string is connected with the output of the phase-shifting full-bridge converter in series and connected with a direct current bus, the input of the phase-shifting full-bridge converter is directly connected with the direct current bus, and the energy storage battery is connected with the direct current bus through a double Buck-Boost converter formed by multiplexing a primary side switching tube of the phase-shifting full-bridge converter.
2. A three-port DC-DC converter for efficient energy transfer as defined in claim 1, wherein: the primary bridge arm switching tubes S1, S3, S2 and S4 are complementarily conducted, the duty ratio is adjustable, the duty ratio of the switching tubes S1 and S2 is the same, the duty ratio of the switching tubes S3 and S4 is the same, and the phase angle between the bridge arms LegA and LegB of the primary full bridge converter is phi.
3. A three-port DC-DC converter for energy efficient transmission according to claim 2, characterized in that: the energy storage battery is characterized in that the energy storage battery is provided with two inductors L with the same size bat1 、L bat2 Respectively connected to two midpoints A, B of the primary legs of the phase-shifted full-bridge converter.
4. A three-port DC-DC converter for energy efficient transmission according to claim 3, characterized in that: output voltage U of the phase-shift full-bridge converter o DC bus voltage U bus Two-terminal voltage U of photovoltaic cell string pv Meeting U between pv ＝U bus -U o While the output voltage U of the phase-shifted full-bridge converter o And input voltage U bus Meeting U between o ＝αU bus U, i.e. U pv ＝U bus -αU bus 。
5. A method of controlling a three-port DC-DC converter for efficient energy transfer according to claim 1, comprising the steps of:
step 1, initializing a system in an initial stage of power-on of the system, and setting the output of a photovoltaic cell MPPT controller and a direct current bus voltage controller in a program to be 0;
step 2, collecting a voltage sensor VSA to obtain a direct current bus voltage value u bus The collected voltage and the set voltage value u * bus Comparing them to obtain deviation signal Deltau bus Input to the controller G bus And limiting the output of the controller, wherein the output is used as a duty ratio control signal d of a primary bridge arm switch tube bus ；
Step 3, collecting a voltage sensor VSB to obtain a photovoltaic string voltage value u pv Collecting a current sensor CSA to obtain a photovoltaic output current value i pv According to the collected photovoltaic cell output voltage and output current, obtaining a given value u of the solar panel terminal voltage by utilizing an MPPT algorithm * pv ；
Step 4, outputting the collected photovoltaic cell output voltage u pv And a given voltage value u obtained by MPPT algorithm * pv Difference, deviation Deltau pv Is sent to the controller G pv The output is used as the phase-shift angle control signal phi between the primary bridge arms of the phase-shift full-bridge converter after operation mppt ；
Step 5, d bus As modulation signal for PWM modulation, amplitude V is adopted M Is used as a bridge arm LegA carrier signal to generate a duty cycle d 1 The pulse sequence is used for driving a lower switching tube S of a primary bridge arm LegA of the phase-shifting full-bridge converter 3 Switch tube S on bridge arm 1 Under-bridge switching tube S 3 Complementary turn-on, duty cycle of (1-d 1 )；
Step 6, lagging angle phi of bridge arm LegA carrier signal mppt Will d bus As the modulation signal, an amplitude of V is adopted M Is used as carrier wave to generate a duty ratio d 1 The pulse sequence is used for driving a lower switching tube S of a primary bridge arm LegB of the phase-shifting full-bridge converter 4 Switch tube S on bridge arm 2 Under-bridge switching tube S 4 Complementary turn-on, duty cycle of (1-d 1 )；
And 7, repeatedly executing the steps 2 to 6 under the condition that the shutdown instruction is not obtained, and exiting the running state when the shutdown instruction is received.
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| CN111207525B (en) * | 2020-02-10 | 2021-05-28 | 南京南瑞继保电气有限公司 | Intermittent driving method and device for heat collecting groove of groove type photo-thermal solar system |
| CN112600419B (en) * | 2020-11-27 | 2022-09-16 | 山东航天电子技术研究所 | Topological structure of non-isolated three-port converter and control method thereof |
| CN112600418A (en) * | 2020-11-27 | 2021-04-02 | 山东航天电子技术研究所 | Topological structure of hybrid energy storage four-port converter and control method thereof |
| CN113162112A (en) * | 2021-04-01 | 2021-07-23 | 科华数据股份有限公司 | Bus voltage control method of photovoltaic grid-connected and off-grid system and photovoltaic grid-connected and off-grid system |
| CN115333133B (en) * | 2022-10-14 | 2023-02-28 | 锦浪科技股份有限公司 | Energy storage system control method and device and energy storage system |
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| US10263456B1 (en) * | 2015-03-13 | 2019-04-16 | The Florida State University Research Foundation, Inc. | Integrated three-port bidirectional DC-DC converter for renewable energy sources |
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| US7102251B2 (en) * | 2003-08-22 | 2006-09-05 | Distributed Power, Inc. | Bi-directional multi-port inverter with high frequency link transformer |
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