CN104993511A - Multifunctional smart domestic photovoltaic power generation control system - Google Patents

Multifunctional smart domestic photovoltaic power generation control system Download PDF

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Publication number
CN104993511A
CN104993511A CN201510302922.2A CN201510302922A CN104993511A CN 104993511 A CN104993511 A CN 104993511A CN 201510302922 A CN201510302922 A CN 201510302922A CN 104993511 A CN104993511 A CN 104993511A
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China
Prior art keywords
module
local
load
novel inverter
power generation
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CN201510302922.2A
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Chinese (zh)
Inventor
査超麟
季马贵
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SUZHOU AIKANG LOW CARBON TECHNOLOGY INSTITUTE Co Ltd
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SUZHOU AIKANG LOW CARBON TECHNOLOGY INSTITUTE Co Ltd
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Priority to CN201510302922.2A priority Critical patent/CN104993511A/en
Publication of CN104993511A publication Critical patent/CN104993511A/en
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to a multifunctional smart domestic photovoltaic power generation control system. The multifunctional smart domestic photovoltaic power generation control system is characterized by comprising a centralized monitoring system (1) and a plurality of novel inverters (2). The centralized monitoring system (1) includes a man-machine interactive module (1) and a centralized specialist database (1.2). The novel inverter (2) includes a maximum power point tracking module (2.1), a DC/AC converting module (2.2), a charge control module (2.3), a battery management system module (2.4) and a local specialist database (2.5). The multifunctional smart domestic photovoltaic power generation control system provided by the invention has advantages of being capable of connecting or disconnecting itself to a main power grid automatically during operation and realizing smart optimization adjustment of user power consumption in a local power grid.

Description

Multifunctional intellectual family photovoltaic power generation control system
Technical field
The present invention relates to a kind of multifunctional intellectual family photovoltaic power generation control system.
Background technology
Along with the continuous increase with population that develops rapidly of global economy, just progressively consume based on the fossil energy of oil, natural gas and coal etc., energy crisis becomes the problem of countries in the world facing.Meanwhile, the series of problems such as the environmental pollution that causes of fossil energy and the ecological balance also becomes the serious hindrance that restriction socio-economic development even threatens human survival.New forms of energy application is just becoming the focus in the whole world.
Solar energy resources is one of the abundantest regenerative resource, and it is widely distributed, renewable, free from environmental pollution, is the desirable alternative energy source of generally acknowledging in the world.Photovoltaic generation is the direct applied a kind of form of solar energy.As the new-generation mode that a kind of environmental friendliness also can effectively raise the standard of living, photovoltaic power generation technology is just progressively applied in the world.Chinese large-sized surface power station and distributed generation technology are taken advantage of a turn of events and get on, because surface power station needs to take a large amount of soil, the bare places such as desert, barren beach, Gobi desert can be made full use of build in west area, and the area nervous in dense population areas and arable land is as areas such as east, what country advocated energetically is photovoltaic distributed generation system.
Distributed generation system is made up of photovoltaic module and support, inverter, electric energy metrical and on-load switch etc., can realize from network operation to ask, and also needs configuration energy storage device and energy-storage battery.Inverter is that the direct current energy sent by photovoltaic module becomes the alternating current meeting grid requirements, and power supply network or user dissolve, and the key equipment of system and nucleus equipment are exactly inverter.
The function that the photovoltaic energy storage inverter that can be applied to distributed energy storage electricity generation system at present has possessed has:
1, can to photovoltaic input realize MPPT to charge in batteries or also/from network operation;
2, electrical network can be realized to storage battery converting charging energy-storing according to manually arranging;
3, in battery management to the detection of the voltage of monomer, electric current, temperature and dielectric strength and heat management, balanced management, management of charging and discharging, fault alarm.
As can be seen from foregoing description, the following not enough common problem of existing equipment ubiquity:
1, the functional independence that existing equipment each several part realizes there is no complementary contact; Can not according to line voltage, accumulator electric-quantity and photovoltaic input power parameter to accumulator cell charging and discharging dynamic adjustments;
2, existing equipment does not have a set of supervisory control system to come electrical network and the coordinated management of each combining inverter unified monitoring when multiple stage is incorporated into the power networks, when making same step down side combining inverter access more, the electrical energy parameter Quality Down of electrical network, whole block supply system reliability can reduce;
3, existing equipment also/change from net state time transition unsmooth, can not to several because usually controlling and regulate the operation of non-key load from net power supply area load, photovoltaic input power, battery power storage amount.
Try out operation through user also to find, system operation is safeguarded and control strategy aspect exists the forward-looking technology problem being badly in need of optimizing simultaneously:
4, family system maintenance requirements
Distributed small-sized rooftop photovoltaic systems is mainly arranged on owner roof, and single-phase or three-phase low-voltage grid integration, installation component capacity is generally lower than 6KWp.Because this part owner is arranged on roof to the shortage of photovoltaic plant knowledge and assembly, owner's maintenance difficulties increases, and entrusts specialized company's O&M to make cost increase affect income, therefore has a strong impact on investment enthusiasm.The family mini system that owner wishes is non-maintaining Intelligent photovoltaic electricity generation system;
5, energy-storage system centralized control and how to improve the problem of whole efficiency
Current, power energy storage is mainly lead-acid battery, the lead acid accumulator comprising maintenance-free battery and colloid battery due to by its volume is large, Heavy Weight, maintenance cost are high, have pollution, the impact of the factor such as not environmentally, can not large-scale application; In addition because lead-acid battery can not high rate charge-discharge, can not accomplish to coordinate and dissolve or exert oneself with photovoltaic input control interface, and the efficiency for charge-discharge of lead-acid battery is low, the electric energy efficiency of inversion again after batteries to store energy is low, causes the efficiency of whole system to reduce;
6, the contradictory problems of safe operation of electric network and the requirement of owner's power supply reliability
For ensureing the safety of electrical network, do not allow distributed generation system islet operation, therefore when after grid power blackout, photovoltaic generating system need in very short time with disengaging electrical network, otherwise network live brings potential safety hazard, and this is that electrical network access criteria is unallowed; But when after a lot of small distributed electricity generation system access, the probability of islet operation increases a lot, power supply reliability is reduced, and therefore at this moment system also must be formed with grid disconnection and have visual cut-off point, and the identification capability of the small-sized inverter of separate unit is difficult to meet the demands; Meanwhile, after grid power blackout system proceeds to, when easily occurring also-switch from Running State, power supply parameter transition is unsmooth, is formed and impacts, when owner's power load is larger, may impacts and cause system protection, key equipment is had a power failure owner's electrical equipment.
The problems referred to above are common problems that current photovoltaic industry exists, along with the propelling of distributed power generation and national grid are to the examination of the operation indicator of the photovoltaic apparatus of Access Network, problem will be more and more outstanding, therefore research and development are launched, meet the research requirement of industry forward-looking technology, Key Common Technologies, seek a kind of novel multifunctional intellectual family photovoltaic power generation control system particularly important.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, provide one can realize automatically running and from main electrical network, complete the multifunctional intellectual family photovoltaic power generation control system that in local power net, user power utilization intelligent optimization regulates.
The object of the present invention is achieved like this:
A kind of multifunctional intellectual family photovoltaic power generation control system, it comprises centralized monitoring system and multiple novel inverter, centralized monitoring system comprises human-machine exchange module and concentrated expert database, novel inverter comprises MPPT maximum power point tracking module, DC-AC modular converter, Charge controlled module, battery management system module and local expert database module, the direct-flow input end of novel inverter connects the output cable of PV assembly, the direct current that novel inverter inputs from direct-flow input end is divided into two-way, one tunnel is output AC electricity after the adjustment of MPPT maximum power point tracking module and the inversion of DC-AC modular converter successively, wherein form a DC output end between MPPT maximum power point tracking module and DC-AC modular converter, DC-AC modular converter rear forms one and exchanges end, another road is back to DC output end successively after Charge controlled module and battery management system module, wherein battery management system module is also connected with external storage battery, exchange end place and outwards separate a local power net connecting line and three load connecting lines, local power net is connected to form after the local power net connecting line extraction of multiple novel inverter, three load connecting lines are provided with load control switch, local power net also becomes owner of electrical network, local power net and main electrical network junction arrange main power network switch, main electrical network arranges a multifunction electric meter at the end of registering one's residence of local power net, multifunction electric meter draws data/address bus, on data/address bus, parallel connection separates multichannel data branch line, multichannel data branch line connects to the corresponding port of the concentrated expert database of centralized monitoring system and the local expert database module of multiple novel inverter respectively.
Three load connecting lines connect external critical loads, general load and secondary load respectively.
Compared with prior art, the invention has the beneficial effects as follows:
Multifunctional intellectual family of the present invention photovoltaic power generation control system has and can realize automatically running and from main electrical network, complete the advantage that in local power net, user power utilization intelligent optimization regulates.
Accompanying drawing explanation
Fig. 1 is the structural representation of multifunctional intellectual family of the present invention photovoltaic power generation control system.
Fig. 2 is the structural representation of novel inverter in Fig. 1.
Wherein:
Centralized monitoring system 1, human-machine exchange module 1.1, concentrated expert database 1.2
Novel inverter 2, MPPT maximum power point tracking module 2.1, DC-AC modular converter 2.2, Charge controlled module 2.3, battery management system module 2.4, local expert database module 2.5, load control switch 2.6
PV assembly 3
Storage battery 4
Local power net 5
Main electrical network 6
Main power network switch 7
Multifunction electric meter 8
Data/address bus 9.
Embodiment
See Fig. 1 ~ Fig. 2, a kind of multifunctional intellectual family photovoltaic power generation control system that the present invention relates to, it comprises centralized monitoring system 1 and multiple novel inverter 2, centralized monitoring system 1 comprises human-machine exchange module 1.1 and concentrated expert database 1.2, novel inverter 2 comprises MPPT maximum power point tracking module (DC/DC MPPT) 2.1, DC-AC modular converter (DC/DC) 2.2, Charge controlled module (DC/DC Charge) 2.3, battery management system module (BATTER BMS) 2.4 and local expert database module (Lacalexperts) 2.5, the direct-flow input end of novel inverter 2 connects the output cable of PV assembly 3, PV assembly 3 distributed arrangement is on roof.
The direct current that novel inverter 2 inputs from direct-flow input end is divided into two-way, one tunnel is output AC electricity after the adjustment of MPPT maximum power point tracking module 2.1 and the inversion of DC-AC modular converter 2.2 successively, wherein form a DC output end between MPPT maximum power point tracking module 2.1 and DC-AC modular converter 2.2, DC-AC modular converter 2.2 rear forms one and exchanges end, another road is back to DC output end successively after Charge controlled module 2.3 and battery management system module 2.4, wherein battery management system module 2.4 is also connected with external storage battery 4.Exchange end place and outwards separate a local power net connecting line and three load connecting lines, local power net 5 is connected to form after the local power net connecting line extraction of multiple novel inverter 2, three load connecting lines are provided with load control switch 2.6, and three load connecting lines connect external critical loads (The critical load), general load (The general load) and secondary load (Secondary load) respectively.Local power net 5 also becomes owner of electrical network 6, local power net 5 and main electrical network (Mains Power) 6 junctions arrange main power network switch 7, main electrical network 6 arranges a multifunction electric meter (Multi function KWH) 8 at the end of registering one's residence of local power net, the RS485 port of multifunction electric meter 8 to be drawn on RS485 data/address bus 9, RS485 data/address bus and in parallelly separate multichannel RS485 data branch line and connect to the corresponding RS485 port of the concentrated expert database 1.2 of centralized monitoring system 1 and the local expert database module 2.5 of multiple novel inverter 2 respectively.
12 holding wires that local expert database module (Lacalexperts) 2.5 is drawn are followed successively by from left to right:
1, access power acquisition line-transect: be connected with local power net connecting line, gather the signals such as alternating voltage, electric current, frequency, phase place and power direction;
2, photovoltaic input gathering line: the circuit inputting novel inverter with PV assembly is connected, and gathers photo-voltaic power supply voltage, electric current;
3, Battery charge controller line: with Charge controlled model calling, controls the charging of photo-voltaic power supply accumulators;
4, battery charging current voltage acquisition line: be connected with the circuit between Charge controlled module, battery management system module, gathers charging voltage and the electric current of storage battery;
5, BMS signal bus: the circuit external with storage battery is connected, and BMS swap data, controls and gathers the charging of storage battery, electric discharge and euqalizing current size;
6, storage battery output signal line: be connected with DC output end, gathers storage battery output voltage current signal;
7, MPPT bus: with MPPT maximum power point tracking model calling, gathers photovoltaic input current, voltage swing and control output current, voltage swing, completes MPPT maximum power point tracking;
8, ac converter bus: be connected with DC-AC modular converter, the AC current-voltage frequency plot that the DC voltage and current signal of Gather and input, control export
9, inversion exports gathering line: be connected with the interchange end at DC-AC modular converter rear, gathers AC current-voltage frequency plot, power direction etc. that inversion exports;
10, critical loads control line: be connected with the load control switch before critical loads, controls the break-make of critical loads and novel inverter circuit;
11, general load control line: be connected with the load control switch before general load, control the break-make of critical loads and novel inverter circuit;
12, secondary load control line: be connected with the load control switch before secondary load, controls the break-make of critical loads and novel inverter circuit.
Operation principle illustrates:
After the series connection of PV assembly, the input IN of access novel inverter, DC power supply is divided into 2 tunnels, and a road is that the charging of storage battery controls, then through the management of BMS, charge a battery, DC energy, after the MPPT maximum power point tracking adjustment of MPPT, is delivered to the input of DC/AC, output AC after inversion in another road, be connected to the grid, novel inverter carries three road load control switches simultaneously: critical loads, general load and secondary load.
System normal condition be the DC power supply of PV assembly except charging a battery, remaining electric energy is reverse into alternating current, supply: three tunnel loads and critical loads, general load and secondary load; As load can not be dissolved completely, unnecessary electric energy is by main grid transmission; As PV assembly can not meet loading demand, differential section is supplemented by main electrical network, meets load request.
Stop power supply period at PV assembly, System Priority uses main mains supply, only has when PV assembly and main electrical network are all stopped power supply, system, automatically by the electric energy of accumulators store, under the control of BMS, is transformed into the input of DC/AC, there is provided continual energy, for load electricity consumption.
When BMS detects that the dump energy of storage battery ensures lower than local experts database amount load parameter, system can cut off the power supply of secondary load automatically; When BMS detects that the dump energy of storage battery ensures lower than the general load parameter of local experts database, system can cut off the power supply of general load, secondary load automatically; When BMS detects that the dump energy of storage battery ensures lower than local experts database critical load parameter, system can provide alarm, and the energy of prompting storage battery is about to be finished; When BMS detects that the dump energy of storage battery ensures lower than local experts database security parameter, system can be cut off so the power supply of load automatically.
The local experts database data acquisition of novel inverter: PV current/voltage, DC charging current voltage, the voltage and current of batteries and cell, the input current voltage of MPPT and output voltage electric current, the input and output voltage electric current of DC/AC, the load of three tunnel loads and change, the electric current of main electrical network, voltage, the information such as frequency, undertaken contrasting and revising by the data be associated with self, in conjunction with the requirement of on-the-spot human-computer exchange, go to control: DC charging current, the size of the unlatching of BMS system equalization and euqalizing current, the output voltage of MPPT, the power output of DC/AC, the switch of three tunnel loads, when pure battery-operated, the also electric discharge management of control BMS.Also possess simultaneously check meter with the Radio infrared of outside, the communication interface function of RS485, TP/ICP, complete the on-the-spot networking of data.The present invention is the related data utilizing imitation control theory and pid control theory to be a data segment by field data to store in correction experts database by every 5 minutes, during formation, the segment information of day, week, month, year, running time is longer, and data correction is more accurate, controls more reliable.
Several novel inverters can by forming a local power net, main power network switch is being had to control with the grid-connected place of main electrical network, before main power network switch, multifunctional electric energy meter is housed, novel inverter, main power network switch, multifunctional electric energy meter and centralized monitoring system form the hardware system that a local power net is powered, by infrared copy meter, the TP/ICP networking technology of RS485 bus, IR, forming one has centralized monitoring system to be main equipment, novel inverter is the master-slave communication system from equipment, coordinates the operation of whole network.Radio infrared reading technique is applied in networking technology by the present invention, copying by IR, the collection of settling signal, data and the transmission of master control order.
When the centralized monitoring system of system logs off, novel inverter address from machine is minimum, and substitute is main frame automatically, realizes system stable operation; When having permission higher equipment access, being automatically assigned as main frame, carrying out more senior policy control, the operating various conflict of resolution system.

Claims (2)

1. a multifunctional intellectual family photovoltaic power generation control system, it is characterized in that it comprises centralized monitoring system (1) and multiple novel inverter (2), centralized monitoring system (1) comprises human-machine exchange module (1.1) and concentrated expert database (1.2), novel inverter (2) comprises MPPT maximum power point tracking module (2.1), DC-AC modular converter (2.2), Charge controlled module (2.3), battery management system module (2.4) and local expert database module (2.5), the direct-flow input end of novel inverter (2) connects the output cable of PV assembly (3), the direct current that novel inverter (2) inputs from direct-flow input end is divided into two-way, one tunnel is output AC electricity after the adjustment of MPPT maximum power point tracking module (2.1) and the inversion of DC-AC modular converter (2.2) successively, wherein form a DC output end between MPPT maximum power point tracking module (2.1) and DC-AC modular converter (2.2), DC-AC modular converter (2.2) rear forms one and exchanges end, another road is back to DC output end successively after Charge controlled module (2.3) and battery management system module (2.4), wherein battery management system module (2.4) is also connected with external storage battery (4), exchange end place and outwards separate a local power net connecting line and three load connecting lines, local power net (5) is connected to form after the local power net connecting line extraction of multiple novel inverter (2), three load connecting lines are provided with load control switch (2.6), local power net (5) also becomes owner of electrical network (6), local power net (5) and main electrical network (6) junction arrange main power network switch (7), main electrical network (6) arranges a multifunction electric meter (8) at the end of registering one's residence of local power net (5), multifunction electric meter (8) is drawn data/address bus (9), on data/address bus, parallel connection separates multichannel data branch line, multichannel data branch line is connected with the corresponding port of the concentrated expert database (1.2) of centralized monitoring system (1) and the local expert database module (2.5) of multiple novel inverter (2) respectively.
2. a kind of multifunctional intellectual family according to claim 1 photovoltaic power generation control system, is characterized in that three load connecting lines connect external critical loads, general load and secondary load respectively.
CN201510302922.2A 2015-06-06 2015-06-06 Multifunctional smart domestic photovoltaic power generation control system Pending CN104993511A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107240917A (en) * 2017-05-16 2017-10-10 沃太能源南通有限公司 A kind of off-network domestic loads intelligent management system judged based on priority level and method
CN112994100A (en) * 2021-03-05 2021-06-18 河北工业大学 Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal

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JP2013188077A (en) * 2012-03-09 2013-09-19 Mitsubishi Electric Corp Photovoltaic power generation system
CN103595074A (en) * 2013-11-26 2014-02-19 北京国电通网络技术有限公司 System for integrated operation of intelligent grid-off-and-in inverter
CN204809881U (en) * 2015-06-06 2015-11-25 苏州爱康低碳技术研究院有限公司 Photovoltaic power generation control system is used at multi -functional intelligent family

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102097821A (en) * 2009-12-15 2011-06-15 三星Sdi株式会社 Grid-connected energy storage system and method of controlling grid-connected energy storage system
JP2013188077A (en) * 2012-03-09 2013-09-19 Mitsubishi Electric Corp Photovoltaic power generation system
CN103595074A (en) * 2013-11-26 2014-02-19 北京国电通网络技术有限公司 System for integrated operation of intelligent grid-off-and-in inverter
CN204809881U (en) * 2015-06-06 2015-11-25 苏州爱康低碳技术研究院有限公司 Photovoltaic power generation control system is used at multi -functional intelligent family

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107240917A (en) * 2017-05-16 2017-10-10 沃太能源南通有限公司 A kind of off-network domestic loads intelligent management system judged based on priority level and method
CN107240917B (en) * 2017-05-16 2020-02-07 沃太能源南通有限公司 Management method of off-network household load intelligent management system
CN112994100A (en) * 2021-03-05 2021-06-18 河北工业大学 Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal
CN112994100B (en) * 2021-03-05 2023-08-22 河北工业大学 Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal

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