CN203466577U - Photovoltaic control inverter all-in-one machine system based on bidirectional conversion structure - Google Patents

Photovoltaic control inverter all-in-one machine system based on bidirectional conversion structure Download PDF

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Publication number
CN203466577U
CN203466577U CN201320534312.1U CN201320534312U CN203466577U CN 203466577 U CN203466577 U CN 203466577U CN 201320534312 U CN201320534312 U CN 201320534312U CN 203466577 U CN203466577 U CN 203466577U
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China
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circuit
bidirectional
flow
bridge
full
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CN201320534312.1U
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Chinese (zh)
Inventor
董睿
何金伟
刘寅
戴永军
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中国电子科技集团公司第三十六研究所
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    • Y02B10/14
    • Y02E10/563
    • Y02E10/566

Abstract

The utility model discloses a photovoltaic control inverter all-in-one machine system based on a bidirectional conversion structure. The electronic circuit is composed of a BUCK-BOOST charging circuit, a DC/DC bidirectional buck-boost circuit, a DC/AC full bridge bidirectional inverter circuit, a storage battery, an MCU control circuit, an information sampling circuit, a PWM drive circuit and a protection circuit. Embedded software is used for realizing MCU information sampling. A PWM wave control signal is sent out, and the working mode switching of an all-in-one machine is controlled. The system controls a closed loop. According to energy, the flow of working modes in a solar module, the storage battery, a local load and a power grid are divided into grid connection forward flow, grid connection reverse flow, off-grid forward flow, fault alarm and the like. The system has the advantages of stable and reliable performance, simple installation and configuration and intelligence, and is mainly used for grid building power generation of a middle and small power solar power generation grid connection and off-grid dual-purpose system.

Description

A kind of photovoltaic based on Bidirectional variable-flow structure is controlled integrated machine for reverse conversion system

Technical field

The utility model relates to a kind of solution of portable solar photovoltaic powered system, has designed the low-power electric power system of the family expenses AC and DC based on heliotechnics.Realize inversion grid connection operation and from network operation, commercial power charged Bidirectional variable-flow structure.

Background technology

Solar energy power generating is a kind of important form that solar energy utilizes, and be to adopt solar module luminous energy to be directly converted to the generation mode of electric energy, and along with technology is constantly progressive, photovoltaic generation becomes one of generation technology most with prospects.And the electric energy that solar components sends is a kind of direct current, unsettled, difficult scheduling, the electric energy of assembly output cannot directly utilize.So solar components is sent, unsettled direct current charges a battery by controller for solar and for low-voltage direct load, this becomes important mode of solar power generation.And this mode is direct current to load request, cannot supply with AC load.To AC load with time the termination inverter after storage battery of being everlasting realize.So, the solar energy system that can supply with supplied by AC/DC electricity just has a plurality of like this equipment of assembly, controller, storage battery, inverter, load, forms this cover system, and wiring is complicated, needs professional to design, install, use.Simultaneity factor configurations match degree is low, inefficiency, and storage battery easily overcharges or crosses to put and cause damage.In the situation that illumination condition is bad, as commercial power charged in need, match again external charger.This strengthens the complexity of photovoltaic system, has run counter to the desired principle easily of installing and using of distributed intelligence electrical network.

Summary of the invention

The utility model be mainly solve the existing system configuration matching degree of prior art low with system, installation, the complicated series of problems of use.Make electricity generation system easy to use, energy management intelligence, compatible with alternating, direct current supply.Substantially meet the necessary electric consumption on lighting of family daily life and the electricity consumption of part recreational facilities.Concentrate function of solar charging, commercial power charged function, photovoltaic invert function (Bidirectional variable-flow), grid-connected from net in one.The low-voltage direct side of storage battery is implemented energy transmitted in both directions to AC, and non-simple increase equipment.

Above-mentioned technical problem of the present utility model is mainly solved by following proposal: adopt electronic circuit and embedded software to control.Electronic circuit is by solar charging circuit, DC/DC Bidirectional up-down volt circuit, the two-way inverter circuit of DC/AC full-bridge, storage battery, MCU control circuit, intelligence sample circuit, PWM(pulse width modulation) drive circuit and protective circuit form; Described solar energy BUCK-BOOST charging circuit, DC/DC Bidirectional up-down volt circuit, the two-way inverter circuit of DC/AC full-bridge are main circuit, and MCU element circuit is control circuit, and intelligence sample circuit sampling main circuit information, offers control circuit.PWM driver element circuit is used for driving the circuit of metal-oxide-semiconductor in main circuit.The various defencive functions of protective circuit completion system.Embedded software is used for realizing the information gathering of MCU, and PWM wave control signal sends, and controls all-in-one mode of operation and switch, system closed loop algorithm, MPPT(MPPT maximum power point tracking) algorithm, island protect algorithm.

Solar charging circuit described in the utility model is synchronous BUCK-BOOST circuit structure.By metal-oxide-semiconductor V1, V2, V3, V4, inductor L1 and capacitor C1 form.

DC/DC Bidirectional up-down volt circuit described in the utility model is the two-way convertor circuit transferring of energy of full-bridge circuit, high frequency transformer, full-bridge rectifier composition.By metal-oxide-semiconductor V5, V6, V7, V8, V9, V10, V11, V12, capacitor C2, C3 and transformer T1 form.

The two-way inverter energy of DC/AC full-bridge described in the utility model can transmitted in both directions, and forward is inversion, is reversed rectification.By metal-oxide-semiconductor V13, V14, V15, V16, capacitor C4, C5 and inductor L2 form.。

Photovoltaic based on Bidirectional variable-flow structure is controlled a control method for integrated machine for reverse conversion system, and when energy is in the flowing of solar components, storage battery, local load and electrical network, system is by following table schema work:

Table 1

The beneficial effects of the utility model are: solar charging circuit is synchronous BUCK-BOOST circuit, by metal-oxide-semiconductor, replace fast recovery diode to carry out the change of current, make that loss is lower, efficiency is higher; The transformer T1 simplicity of design of two-way full-bridge DC/DC circuit, also replaces fast recovery diode to carry out the change of current by metal-oxide-semiconductor, reduces energy expense, and during energy forward flow, for boosting, reverse flow is to be step-down; The two-way inverter energy of DC/AC full-bridge gets final product two-way flow, during forward flow, is inversion, is rectification during reverse flow.The energy in bidirectional flow structure of this circuit is that whole solar power generation integrated system has been saved the great expense on equipment, has simplified the complex configurations of traditional solar energy system.

Accompanying drawing explanation

Accompanying drawing 1 is the system architecture diagram that the related a kind of photovoltaic based on Bidirectional variable-flow structure of the utility model is controlled integrated machine for reverse conversion system;

Accompanying drawing 2 is synchronous BUCK-BOOST circuit that the related a kind of photovoltaic based on Bidirectional variable-flow structure of the utility model is controlled integrated machine for reverse conversion system;

Accompanying drawing 3 is DC/DC Bidirectional up-down volt circuits that the related a kind of photovoltaic based on Bidirectional variable-flow structure of the utility model is controlled integrated machine for reverse conversion system;

Accompanying drawing 4 is two-way inverters of DC/AC full-bridge that the related a kind of photovoltaic based on Bidirectional variable-flow structure of the utility model is controlled integrated machine for reverse conversion system;

Embodiment

Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described in detail.

As shown in Figure 1, a kind of photovoltaic control integrated machine for reverse conversion system based on Bidirectional variable-flow structure is comprised of solar panel, synchronous BUCK-BOOST circuit, DC/DC Bidirectional up-down volt circuit, the two-way inverter of DC/AC full-bridge, storage battery, local load, electrical network, drive circuit, intelligence sample circuit, MCU control circuit and protective circuit.Wherein synchronous BUCK-BOOST circuit input end is received in solar panel output, and circuit carries out DC/DC conversion accumulators power supply and powers to rear class thus; The low-pressure end of DC/DC Bidirectional up-down volt circuit with synchronize BUCK-BOOST circuit output end, storage battery and be connected, when forward flow boosts, the low-voltage direct of storage battery or synchronous BUCK-BOOST circuit output is become to high voltage direct current by full-bridge, high frequency transformer, full-bridge converter circuit, be the high-pressure side of DC/DC Bidirectional up-down volt circuit; Negative sense flows while being step-down, and it is charge in batteries that the high voltage direct current of high-pressure side is become to low-voltage direct by full-bridge, high frequency transformer, the full-bridge change of current; The two-way inverter DC terminal of DC/AC full-bridge is connected with the high-pressure side of DC/DC Bidirectional up-down volt circuit, exchange end and connect electrical network or local load, during energy positive flow fortune, circuit carries out invert function, high voltage direct current is converted to industrial-frequency alternating current, energy negative sense carries out rectification while flowing, and industrial-frequency alternating current is converted to high voltage direct current.Wherein MCU control circuit is born generation, circuit closed-loop control, the MPPT(MPPT maximum power point tracking of pwm signal) algorithm, island protect and integrated machine system mode of operation are switched when grid-connected algorithm.The pwm signal that PWM drive circuit sends MCU drives, and controls the metal-oxide-semiconductor in each main circuit.Intelligence sample circuit is divided into assembly sampling, storage battery sampling, the sampling of HV direct current, AC sampling.Protective circuit is responsible for under-voltage/over-voltage protection, the defencive functions such as overload, short-circuit protection.

As shown in Figure 2, for a kind of photovoltaic based on Bidirectional variable-flow structure, control the synchronous BUCK-BOOST circuit of integrated machine for reverse conversion system.The power conversion partial circuit that consists of it V1, V2, V3, V4, L1, C1, wherein V2 and V3 have replaced the change of current function of fast recovery diode, have reduced the energy spending of system with the low conduction loss of metal-oxide-semiconductor.

As shown in Figure 3, for a kind of photovoltaic based on Bidirectional variable-flow structure, control the DC/DC Bidirectional up-down volt circuit of integrated machine for reverse conversion system.DC/DC Bidirectional up-down volt circuit can flow by bidirectional energy, when forward energy flows, low-pressure end BAT place voltage is passed through to full-bridge V5, V6, V7, V8, T1 high frequency transformer boosts, the circuit change of current consisting of V9, V10, V11, V12 again, after C3 filtering, to the high-pressure side HV of circuit.When energy negative sense flows, high-pressure side HV place high direct voltage is passed through to full-bridge V9, V10, V11, V12, the step-down of T1 high frequency transformer, then by V5, V6, V7, the V8 change of current, C2 filtering is to the low-pressure end BAT of circuit.

As shown in Figure 4, for a kind of photovoltaic based on Bidirectional variable-flow structure, control the two-way inverter of DC/AC full-bridge of integrated machine for reverse conversion system.Its energy can two-way flow, when energy forward flow, by full-bridge circuit V13, V14, V15, V16, carries out inversion, and the DC inversion of high voltage direct current end HV is become and exchanges end AC, and L2 and C are filter circuit.When energy negative sense flows, by full-bridge circuit V13, V14, V15, V16, carry out rectification, the AC rectification that exchanges end AC is become to the direct current of high voltage direct current end HV, realize energy in bidirectional flow, C4 is buffer capacitor.

Overall operation mode and energy flow that a kind of photovoltaic based on Bidirectional variable-flow structure is controlled integrated machine for reverse conversion system are as follows:

1. when grid-connected, when solar components can fully provide in the charging of storage battery or situation that storage battery has been full of, energy forward flow, solar panel is to charge in batteries and by DC/DC booster circuit, AC/DC inverter circuit can to grid-connected the sending of electrical network, inverter is operated in grid-connected pattern, and local load is connected with electrical network, preferential absorption solar power generation.

2. when grid-connected, when solar cell power output plate cannot meet charge in batteries power or solar energy and cannot provide energy, energy back flows, by electrical network by two-way DC/AC inversion road reverse operation, two-way DC/DC step-up/step-down circuit reverse operation charges to storage battery, local load is by mains supply, and inverter is operated in rectification mode of operation.

3. during from net, because of reasons such as electric network fault or scheduling, when native system departs from electrical network.Native system is charged to storage battery by solar energy, and storage battery boosts inversion to local load supplying, energy forward flow, and inverter is operated in from network operation pattern.When battery tension is too low, closes by force load and carry out protection.

Claims (4)

1. the photovoltaic based on Bidirectional variable-flow structure is controlled an integrated machine for reverse conversion system, it is characterized in that: electronic circuit is comprised of solar charging circuit, DC/DC Bidirectional up-down volt circuit, the two-way inverter circuit of DC/AC full-bridge, storage battery, MCU control circuit, component voltage sample circuit, battery tension current sampling circuit, HV DC voltage and current sample circuit, outlet side sample circuit, PWM drive circuit and protective circuit, embedded software is used for realizing the information gathering of MCU, and PWM wave control signal sends, and controls the switching of all-in-one mode of operation, system closed loop, wherein main circuit is: solar panel output is connected with the input of BUCK-BOOST charging circuit, BUCK-BOOST charging circuit is connected with storage battery, DC/DC Bidirectional up-down volt circuit low-pressure end, DC/DC Bidirectional up-down volt circuit high-pressure side is connected with the two-way inverter circuit DC terminal of full-bridge DC/AC, and the two-way inverter circuit of full-bridge DC/AC exchanges end and is connected with local load, electrical network, component voltage sample circuit is connected between solar panel and MCU control circuit, battery tension current sampling circuit is connected between storage battery and MCU control circuit, HV DC voltage and current sample circuit is connected between DC/DC Bidirectional up-down volt circuit high-pressure side and MCU control circuit, outlet side sample circuit is connected between the two-way inverter circuit of full-bridge DC/AC and MCU control circuit, PWM drive circuit is connected between MCU control circuit and BUCK-BOOST charging circuit, between MCU control circuit and DC/DC Bidirectional up-down volt circuit, between MCU control circuit and the two-way inverter circuit of full-bridge DC/AC, protective circuit is connected between BUCK-BOOST charging circuit, DC/DC Bidirectional up-down volt circuit, the two-way inverter circuit of full-bridge DC/AC and MCU control circuit.
2. a kind of photovoltaic based on Bidirectional variable-flow structure according to claim 1 is controlled integrated machine for reverse conversion system, it is characterized in that: described solar charging circuit is synchronous BUCK-BOOST circuit.
3. a kind of photovoltaic based on Bidirectional variable-flow structure according to claim 1 is controlled integrated machine for reverse conversion system, it is characterized in that: described DC/DC Bidirectional up-down volt circuit is full-bridge step-up/step-down circuit.
4. a kind of photovoltaic based on Bidirectional variable-flow structure according to claim 1 is controlled integrated machine for reverse conversion system, it is characterized in that: the described two-way inverter circuit of DC/AC full-bridge, forward is inversion, is reversed rectification.
CN201320534312.1U 2013-08-29 2013-08-29 Photovoltaic control inverter all-in-one machine system based on bidirectional conversion structure CN203466577U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103915884A (en) * 2014-04-22 2014-07-09 武汉理工大学 Ship emergency power source system based on solar power generation
CN104467011A (en) * 2014-11-25 2015-03-25 苏州市职业大学 Schedulable dual-mode inverter and control method of schedulable dual-mode inverter
CN105141023A (en) * 2014-05-30 2015-12-09 宁波保税区绿光能源科技有限公司 Solar power supply processing system in area without mains supply or with instable mains supply output
CN110445178A (en) * 2019-08-28 2019-11-12 深圳库博能源科技有限公司 A kind of distribution roof photovoltaic power generation intelligent energy storage system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103915884A (en) * 2014-04-22 2014-07-09 武汉理工大学 Ship emergency power source system based on solar power generation
CN105141023A (en) * 2014-05-30 2015-12-09 宁波保税区绿光能源科技有限公司 Solar power supply processing system in area without mains supply or with instable mains supply output
CN104467011A (en) * 2014-11-25 2015-03-25 苏州市职业大学 Schedulable dual-mode inverter and control method of schedulable dual-mode inverter
CN110445178A (en) * 2019-08-28 2019-11-12 深圳库博能源科技有限公司 A kind of distribution roof photovoltaic power generation intelligent energy storage system
CN110445178B (en) * 2019-08-28 2020-05-01 深圳库博能源科技有限公司 Distributed roof photovoltaic power generation intelligent energy storage system

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Assignee: ZHEJIANG JEC NEW ENERGY TECHNOLOGY CO., LTD.

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Contract record no.: 2015330000200

Denomination of utility model: Photovoltaic control inverter all-in-one machine system based on bidirectional conversion structure

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