CN110620377A - Three-port DC-DC converter applied to efficient energy transmission of photovoltaic power generation system and control method thereof - Google Patents
Three-port DC-DC converter applied to efficient energy transmission of photovoltaic power generation system and control method thereof Download PDFInfo
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- CN110620377A CN110620377A CN201910868828.1A CN201910868828A CN110620377A CN 110620377 A CN110620377 A CN 110620377A CN 201910868828 A CN201910868828 A CN 201910868828A CN 110620377 A CN110620377 A CN 110620377A
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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 cell, an energy storage battery, a phase-shifted full-bridge converter and a direct-current bus, and the circuit topology structure is the phase-shifted full-bridge converter of a multiplexing primary side bridge side switch tube. The input of the phase-shifted full-bridge converter is connected with the direct-current bus, the output of the phase-shifted full-bridge converter is connected with the photovoltaic cell in series and connected into the direct-current bus, and the output voltage of the phase-shifted full-bridge converter compensates the difference value between the voltage of the direct-current bus and the voltage of the photovoltaic cell and enables the photovoltaic cell to be in a maximum power obtaining state. The charging and discharging current of the storage battery is adjusted by adjusting the duty ratio of a switching tube of a primary side bridge arm of the phase-shifted full-bridge converter, and the stability of the direct-current bus voltage is maintained. By adopting the topological structure, the efficiency of the whole photovoltaic power generation system can be obviously improved on the basis of maintaining the voltage stability of the direct current bus and obtaining the maximum photovoltaic power, and the application prospect is wide.
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 of human resource consumption and the decrease of non-renewable resources on earth, new alternative energy sources are being searched for human beings all over the world. Solar energy is a renewable energy source and has great development space. However, the photovoltaic cell itself has a problem of low energy conversion efficiency, and how to improve the efficiency of the whole photovoltaic power generation system is very important.
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, the energy can be supplied to the direct current bus and the redundant energy is transmitted to the energy storage battery so as 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 obtaining state, and meanwhile, the storage battery releases energy to ensure the stability of the direct current bus voltage. A Boost converter is generally adopted in a traditional photovoltaic power generation system to obtain the maximum power of a photovoltaic cell, the structure is simple, and the efficiency is high. However, energy generated by photovoltaic power generation can be gathered into the direct current bus only through the Boost converter, and certain energy loss exists. In addition, the Boost converter has the problem of poor matching between the working efficiency and the output power of the photovoltaic cell, and the power conversion efficiency of the whole system is influenced.
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 in order to obtain photovoltaic maximum power and keep the voltage of a direct-current bus stable.
The purpose of the invention is realized as follows: a three-port DC-DC converter for high-efficiency energy transmission of photovoltaic power generation system features that its topological structure is a phase-shifted full-bridge converter with multiplex primary-side switch tubes, which is composed of HF transformer HFT and switch tubes S1-S4Primary side full bridge converter of phase-shifted full bridge converter, diode D1-D4Formed uncontrolled rectifier bridge and filter inductor LoFilter capacitor CoComposition is carried out; the photovoltaic solar cell string and the output phase of the phase-shifted full-bridge converter are connected in series to be connected with a direct-current bus, the input of the phase-shifted full-bridge converter is directly connected with the direct-current bus, and the energy storage battery forms a double Buck-Boost converter through a primary side switching tube of the multiplexing phase-shifted full-bridge converter and is connected with the direct-current bus.
The invention also includes such structural features:
1. the switching tubes S1 and S3, S2 and S4 of the primary side bridge arm are in complementary conduction, the duty ratio is adjustable, the duty ratios of the switching tubes S1 and S2 are the same, the duty ratios of the switching tubes S3 and S4 are the same, and the phase angle between the bridge arms Leg A and Leg B of the primary side full-bridge converter is the phase angle
2. The energy storage battery passes through two inductors L with the same sizebat1、Lbat2Are connected to the two midpoints A, B of the primary side bridge arm of the phase-shifted full-bridge converter respectively.
3. Output voltage U of phase-shifted full-bridge converteroDC bus voltage UbusAnd the voltage U at both ends of the photovoltaic cell stringpvSatisfy U therebetweenpv＝Ubus-UoAnd the output voltage U of the phase-shifted full-bridge converteroAnd an input voltage UbusSatisfy U therebetweeno＝αUbusI.e. Upv＝Ubus-αUbus。
4. A three-port DC-DC converter control method applied to energy efficient transmission of a photovoltaic power generation system specifically comprises the following steps:
step 1, initializing a system at the initial power-on stage of the system, and setting the output of a photovoltaic cell MPPT controller and the output of a DC bus voltage controller in a program to be 0;
step 2, collecting VSA to obtain a direct current bus voltage value ubusComparing the collected voltage with the set voltage value u* busComparing them to obtain their deviation signals delta ubusInput to the controller GbusAnd limiting the output of the controller, and outputting the output as a duty ratio control signal d of a switching tube of a primary side bridge armbus；
Step 3, collecting VSB of the voltage sensor to obtain a photovoltaic string voltage value upvCollecting current sensor CSA to obtain photovoltaic output current value ipvAcquiring a given value u of the terminal voltage of the solar cell panel by utilizing an MPPT algorithm according to the acquired output voltage and output current of the photovoltaic cell* pv；
Step 4, outputting the collected photovoltaic cell output voltage upvWith a given voltage value u derived by means of the MPPT algorithm* pvMaking a difference, deviation DeltaupvIs sent to the controller GpvThe output of the phase-shifting control circuit is used as a phase-shifting angle control signal between bridge arms of a primary side of the phase-shifting full-bridge converter after operation
Step 5, mixing dbusAs modulation signal for PWM modulation, with amplitude VMThe triangular wave is used as a carrier signal of a bridge arm Leg A to generate a duty ratio d1The pulse sequence is used for driving a lower switching tube S of a primary side bridge arm Leg A of the phase-shifted full-bridge converter3Switch tube S on bridge arm1With its under-bridge switching tube S3Complementary conduction with duty ratio of (1-d)1)；
Step 6, bridge armLag angle of Leg A carrier signalWill dbusAs modulation signal, amplitude V is usedMIs used as a carrier wave to generate a duty ratio d1The pulse sequence is used for driving a lower switching tube S of a primary side bridge arm Leg B of the phase-shifted full-bridge converter4Switch tube S on bridge arm2With its under-bridge switching tube S4Complementary conduction with duty ratio of (1-d)1)；
And 7, repeatedly executing the steps 2 to 6 under the condition that the stop instruction is not obtained, and quitting the running state when receiving the stop instruction.
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 of the photovoltaic cell is controlled by adjusting the phase shift angle between the primary side bridge arms of the phase-shifted full-bridge converter. The charge and discharge control of the energy storage battery is realized by adjusting the duty ratio of a switching tube of a primary side bridge arm of the phase-shifted full-bridge converter so as to keep the voltage of a direct current bus stable. Most of energy generated by the photovoltaic cell can be directly transmitted to a direct current bus without an intermediate power conversion link, and the efficiency of the whole power generation system is remarkably improved. The phase-shifted full-bridge converter is used as a power compensator, and the transmitted power only occupies a small part, 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 on the primary side through two identical inductors, is connected with the direct current bus through the switching tubes of the multiplexing primary bridge arm, and maintains the stability of the voltage of the direct current bus by adjusting the duty ratio of the switching tubes of the primary bridge arm, so that the charging and discharging management of the energy storage battery is realized. The photovoltaic cell string and the output of the phase-shifted full-bridge converter are connected in series to be connected with a direct-current bus, most of energy generated by the photovoltaic cell string is directly gathered into the direct-current bus through a secondary side uncontrolled diode rectifier bridge and an LC filter of the phase-shifted full-bridge converter, an intermediate power conversion link is omitted, the transmission efficiency is remarkably improved, and loss in the transmission process is reduced. Meanwhile, the phase-shifted full-bridge converter is used as a power compensator, and the transmitted energy is only a small part of the total transmitted energy, so that the loss in the transmission process is reduced, and the capacity and the volume of the high-frequency transformer are reduced.
In a photovoltaic power generation system, a photovoltaic solar cell string is connected in series with the output of a phase-shifted full-bridge converter and is connected to a direct-current bus, the input of the phase-shifted full-bridge converter is directly connected with the direct-current bus, and an energy storage battery forms a double Buck-Boost converter through a primary side switching tube of the multiplexing phase-shifted full-bridge converter and is connected with the direct-current bus. The maximum power of the photovoltaic cell is obtained and controlled by adjusting the phase shift angle of the primary side bridge arm of the phase-shifted full-bridge converter, and the stability of the direct-current bus voltage is kept by adjusting the duty ratio of the switching tube of the primary side bridge arm. Most energy generated by the photovoltaic cell can be directly converged on a direct current bus without an intermediate power conversion link, so that the efficiency is remarkably improved, the phase-shifted full-bridge converter is used as a power compensator, and the transmitted power only occupies a small part, so that the size of the converter is effectively reduced.
Drawings
FIG. 1 is a topological block 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 output power at each port of a high efficiency three-port DC-DC converter;
fig. 4 is an execution flowchart of the stable operation of the photovoltaic power generation system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The main circuit topology in figure 1 is a phase-shifted full-bridge converter with a multiplexing primary side bridge side switch tube, which mainly comprises a high-frequency transformer HFT and a switch tube S1-S4The primary side full-bridge converter of the phase-shifted full-bridge converter is composed of a diode D1-D4Formed uncontrolled rectifier bridge and filter inductor LoFilter capacitor CoAnd (4) forming. Wherein, the switching tubes S1, S3, S2 and S4 of the primary side bridge arm are in complementary conduction, the duty ratio is adjustable, and the switches are onThe duty ratios of the switch-off tubes S1 and S2 are the same, the duty ratios of S3 and S4 are the same, and the phase angle between the bridge arms Leg A and Leg B of the primary side full bridge converter isThe energy storage battery passes through two inductors L with the same sizebat1、Lbat2The photovoltaic cell string is connected with the two middle points A, B of the primary side bridge arm of the phase-shifted full-bridge converter, the photovoltaic cell string is connected with the output of the phase-shifted full-bridge converter in series and is connected with the DC Bus, and the input of the phase-shifted full-bridge converter is directly connected to the DC Bus. Wherein ipvFor the output current of the photovoltaic cell string, UpvIs the output voltage of the photovoltaic cell string, UbusThe value of the direct current bus voltage is obtained.
The principle of the topological structure for realizing maximum power acquisition of the photovoltaic cell is that the photovoltaic cell string and the output phase of the phase-shifted full-bridge converter are connected in series to be connected with a direct-current bus, and then the output voltage U of the phase-shifted full-bridge converter is obtainedoDC bus voltage UbusAnd the voltage U at both ends of the photovoltaic cell stringpvShould satisfy Upv＝Ubus-UoAnd the output voltage U of the phase-shifted full-bridge converteroAnd an input voltage UbusShould satisfy Uo＝αUbusI.e. Upv＝Ubus-αUbusTherefore, when the DC bus voltage is stabilized at the set value, the output voltage u of the photovoltaic battery string is adjustedpvAnd an output current ipvSampling, determining the terminal voltage value obtained by the maximum photovoltaic power through a maximum power tracking algorithm, and outputting the voltage alpha U to the phase-shifted full-bridge converterbusThereby, the maximum power tracking control of the photovoltaic battery string can be realized.
The specific application scheme of the high-efficiency DC-DC converter proposed by the present invention is as follows, with reference to fig. 1 and fig. 2:
step 1, firstly, performing software and hardware initialization work related to system control at the initial stage of system power-on, wherein important work is to set the output of a photovoltaic cell MPPT controller and the output of a direct current bus voltage controller in a program to be 0;
step 2, acquiring a direct current bus voltage value u obtained by a voltage sensor VSAbusComparing the collected voltage with the set voltage value u* busComparing them to obtain their deviation signals delta ubusInput to the controller GbusAnd limiting the output of the controller, and outputting the output as a duty ratio control signal d of a switching tube of a primary side bridge armbus；
Step 3, acquiring a voltage value u of the photovoltaic string obtained by VSB of the voltage sensorpvAnd the photovoltaic output current value i can be obtained by collecting the current sensor CSApvAcquiring a given value u of the terminal voltage of the solar cell panel by utilizing an MPPT algorithm according to the acquired output voltage and output current of the photovoltaic cell* pv；
Step 4, outputting the collected photovoltaic cell output voltage upvWith a given voltage value u derived by means of the MPPT algorithm* pvMaking a difference, deviation DeltaupvIs sent to the controller GpvThe output of the phase-shifting control circuit is used as a phase-shifting angle control signal between bridge arms of a primary side of the phase-shifting full-bridge converter after operation
Step 5, mixing dbusAs modulation signal for PWM modulation, with amplitude VMThe triangular wave is used as a carrier signal of a bridge arm Leg A to generate a duty ratio d1The pulse sequence is used for driving a lower switching tube S of a primary side bridge arm Leg A of the phase-shifted full-bridge converter3Switch tube S on bridge arm1With its under-bridge switching tube S3Complementary conduction with duty ratio of (1-d)1)；
Step 6, delaying the carrier signal of the Leg A by an angleWill dbusAs modulation signal, again with amplitude VMIs used as a carrier wave to generate a duty ratio d1The pulse sequence is used for driving the lower part of a primary side bridge arm Leg B of the phase-shifted full-bridge converterSwitch tube S4Switch tube S on bridge arm2With its under-bridge switching tube S4Complementary conduction with duty ratio of (1-d)1)。
And 7, repeatedly executing the steps (2) to (6) under the condition that the stop command is not obtained, and exiting the running state after receiving the stop command.
One specific example provided by the present invention is as follows:
voltage at the maximum power point of the solar photovoltaic cell string: 200V; the end voltage of the energy storage battery is 120V; outputting 240V of direct current bus voltage; output power: 3.85 KW; the phase-shifted full-bridge inverter has a switching frequency of 20 kHz.
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 cell is reduced (from 5125W to 3575W), the output power on the dc bus is stabilized at 3.84KW within 0.06s, the voltage of the dc bus can be kept stable, the storage battery is changed from a charging state to a discharging state, and the power transmitted by the phase-shifted full-bridge converter is changed from 1025W to 700W, which only accounts for about 20% of the total transmission power.
In summary, the invention provides a high-efficiency three-port DC-DC converter and a control method thereof, which are applied to a photovoltaic power generation system to obtain the maximum photovoltaic power and keep the voltage of a direct-current bus stable. The photovoltaic power generation system is composed of a photovoltaic solar cell, an energy storage battery, a phase-shifted 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 a direct current bus, and the transmission efficiency of the whole system can be remarkably improved. The input of the phase-shifted full-bridge converter is connected with the direct-current bus, the output of the phase-shifted full-bridge converter is connected with the photovoltaic cell in series and connected into the direct-current bus, and the output voltage of the phase-shifted full-bridge converter compensates the difference value between the voltage of the direct-current bus and the voltage of the photovoltaic cell and enables the photovoltaic cell to be in a maximum power obtaining state. The charging and discharging current of the storage battery is adjusted by adjusting the duty ratio of a switching tube of a primary side bridge arm of the phase-shifted full-bridge converter, and the stability of the direct-current bus voltage is maintained. By adopting the topological structure, the efficiency of the whole photovoltaic power generation system can be obviously improved on the basis of maintaining the voltage stability of the direct current bus and obtaining the maximum photovoltaic power.
Claims (5)
1. A three-port DC-DC converter for high-efficiency energy transmission of photovoltaic power generation system is a phase-shifted full-bridge converter with a circuit topology structure of a multiplex primary side bridge side switch tube, and comprises a high-frequency transformer (HFT) and a switch tube (S)1-S4Primary side full bridge converter of phase-shifted full bridge converter, diode D1-D4Formed uncontrolled rectifier bridge and filter inductor LoFilter capacitor Co(ii) a The method is characterized in that: the photovoltaic solar cell string and the output phase of the phase-shifted full-bridge converter are connected in series to be connected with a direct-current bus, the input of the phase-shifted full-bridge converter is directly connected with the direct-current bus, and the energy storage battery forms a double Buck-Boost converter through a primary side switching tube of the multiplexing phase-shifted full-bridge converter and is connected with the direct-current bus.
2. The three-port DC-DC converter applied to energy efficient transmission of a photovoltaic power generation system according to claim 1, wherein: the switching tubes S1 and S3, S2 and S4 of the primary side bridge arm are in complementary conduction, the duty ratio is adjustable, the duty ratios of the switching tubes S1 and S2 are the same, the duty ratios of the switching tubes S3 and S4 are the same, and the phase angle between the bridge arms Leg A and Leg B of the primary side full-bridge converter is the phase angle
3. The three-port DC-DC converter applied to energy efficient transmission of a photovoltaic power generation system according to claim 2, wherein: the energy storage battery passes through two inductors L with the same sizebat1、Lbat2Are connected to the two midpoints A, B of the primary side bridge arm of the phase-shifted full-bridge converter respectively.
4. The three-port DC-DC converter applied to energy efficient transmission of a photovoltaic power generation system according to claim 3, wherein: output voltage U of the phase-shifted full-bridge converteroDC bus voltage UbusAnd, andboth-end voltage U of photovoltaic cell stringpvSatisfy U therebetweenpv＝Ubus-UoAnd the output voltage U of the phase-shifted full-bridge converteroAnd an input voltage UbusSatisfy U therebetweeno＝αUbusI.e. Upv＝Ubus-αUbus。
5. A control method of a three-port DC-DC converter applied to efficient energy transmission of a photovoltaic power generation system is characterized by comprising the following steps:
step 1, initializing a system at the initial power-on stage of the system, and setting the output of a photovoltaic cell MPPT controller and the output of a DC bus voltage controller in a program to be 0;
step 2, collecting VSA to obtain a direct current bus voltage value ubusComparing the collected voltage with the set voltage value u* busComparing them to obtain their deviation signals delta ubusInput to the controller GbusAnd limiting the output of the controller, and outputting the output as a duty ratio control signal d of a switching tube of a primary side bridge armbus；
Step 3, collecting VSB of the voltage sensor to obtain a photovoltaic string voltage value upvCollecting current sensor CSA to obtain photovoltaic output current value ipvAcquiring a given value u of the terminal voltage of the solar cell panel by utilizing an MPPT algorithm according to the acquired output voltage and output current of the photovoltaic cell* pv；
Step 4, outputting the collected photovoltaic cell output voltage upvWith a given voltage value u derived by means of the MPPT algorithm* pvMaking a difference, deviation DeltaupvIs sent to the controller GpvThe output of the phase-shifting control circuit is used as a phase-shifting angle control signal between bridge arms of a primary side of the phase-shifting full-bridge converter after operation
Step 5, mixing dbusAs modulation signal for PWM modulation, with amplitude VMThe triangular wave is taken as a bridge arm Leg A carrier signalNumber, generating a duty cycle of d1The pulse sequence is used for driving a lower switching tube S of a primary side bridge arm Leg A of the phase-shifted full-bridge converter3Switch tube S on bridge arm1With its under-bridge switching tube S3Complementary conduction with duty ratio of (1-d)1)；
Step 6, delaying the carrier signal of the Leg A by an angleWill dbusAs modulation signal, amplitude V is usedMIs used as a carrier wave to generate a duty ratio d1The pulse sequence is used for driving a lower switching tube S of a primary side bridge arm Leg B of the phase-shifted full-bridge converter4Switch tube S on bridge arm2With its under-bridge switching tube S4Complementary conduction with duty ratio of (1-d)1)；
And 7, repeatedly executing the steps 2 to 6 under the condition that the stop instruction is not obtained, and quitting the running state when receiving the stop instruction.
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| CN111207525A (en) * | 2020-02-10 | 2020-05-29 | 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 |
| CN112600419A (en) * | 2020-11-27 | 2021-04-02 | 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 |
| CN115333133A (en) * | 2022-10-14 | 2022-11-11 | 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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| CN111207525A (en) * | 2020-02-10 | 2020-05-29 | 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 |
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| CN115333133A (en) * | 2022-10-14 | 2022-11-11 | 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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