CN104716655A - Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter - Google Patents

Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter Download PDF

Info

Publication number
CN104716655A
CN104716655A CN201410697362.0A CN201410697362A CN104716655A CN 104716655 A CN104716655 A CN 104716655A CN 201410697362 A CN201410697362 A CN 201410697362A CN 104716655 A CN104716655 A CN 104716655A
Authority
CN
China
Prior art keywords
power
control
inverter
power factor
storage battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410697362.0A
Other languages
Chinese (zh)
Inventor
肖朝霞
樊世军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin Polytechnic University
Original Assignee
Tianjin Polytechnic University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianjin Polytechnic University filed Critical Tianjin Polytechnic University
Priority to CN201410697362.0A priority Critical patent/CN104716655A/en
Publication of CN104716655A publication Critical patent/CN104716655A/en
Pending legal-status Critical Current

Links

Classifications

    • H02J3/385—
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention belongs to the field of new energy power generation control application, and relates to a control system for improving the grid connection point power factor of a photovoltaic storage battery grid-connected inverter, in particular to the control system based on layering. The control system comprises an upper layer control part and a bottom layer control part. The upper layer control part is used for system working mode selection, lower layer controller parameter giving and the like, and the lower layer control part is used for storage battery charge-discharge control and inverter inner and outer loop control. The control system is characterized in that the control system achieves flexible control inverter active and reactive output according to the current sampled data (photovoltaic cell maximum power, load power and mains supply power) and the system rated capacity, namely, the active power is output as far as possible, and meanwhile the grid connection point power factor can be improved by providing reactive power; the mode switching between a power outer loop and an MPPT outer loop is controlled, so that the inner loop current is controlled indirectly, and the system capacity can be prevented from being of limit. Through the storage battery charge-discharge mode, the utilization rate of a photovoltaic cell is improved, and all-day continuous operation of the system is achieved. The control strategy is based on a Matlab2013b simulation environment and a dSPACE1103 controller, and the functions of theoretical verification, model off-line debugging, parameter on-line proving, real-time monitoring and the like are achieved.

Description

Photovoltaic storage battery combining inverter improves and site power factor controlling system
Technical field
The invention belongs to generation of electricity by new energy and control application, be specifically related to a kind of combining inverter and improve and site power factor controlling system.
Background technology
Along with the continuous improvement of photovoltaic power generation technology and grid-connected scale constantly expand, photovoltaic generation is just progressively broken away from and is relied on government subsidy and demonstration project pattern to commercialized development.Simultaneously because generation of electricity by new energy is to the continuous increase of the permeability of electrical network, it more and more be can not ignore the impact of electrical network, the maintenance cost of electrical network is also increasing, and therefore it should play an active part in electric network coordination construction and management and running, realizes providing powerful support for and supplementing to electrical network.The intermittence of wind-powered electricity generation, solar power generation also brings contradiction, has had higher requirement to energy storage technology.Present bright prospects with the BIPV that home unit and urban architecture are carrier, with island micro-capacitance sensor independent operating system for example management systems presents typical microgrid management system.Simultaneously Parallel Problem arises at the historic moment, and some areas photovoltaic plant is asynchronous with supporting power grid construction, project management is lack of standardization, the problem of standard and quality management weakness is also very outstanding, and ubiquity abandons optical phenomenon.Be that the distributed power generation EMS of representative demands perfection urgently with micro-capacitance sensor.The maximum obstacle of restriction photovoltaic generation is still its high cost of electricity-generating compared with conventional electric power, and while improving constantly generating efficiency, therefore making full use of himself generating feature, to improve utilization rate of equipment and installations be also one of current research focus.Distributed power generation utilizes own characteristic, and practical function diversification, electricity consumption flexibly, make full use of equipment of itself to reduce cost of electricity-generating.
Summary of the invention
The present invention answers the demand of photovoltaic generation own characteristic and system cloud gray model solution just, for problems such as photovoltaic plant economical operation feasibilities, propose a kind of photovoltaic storage battery combining inverter to improve and site power factor controlling system, a kind of muti-layer control tactics is provided, in conjunction with batteries to store energy management and circuit control device part with also site power factor and system conditions for foundation, the control of control inverter power outer shroud and MPPT control the method that given alternating current inner ring controls to realize inverter control, reach flexible control inverter power stage and dynamically improve and site power factor.For this reason, the present invention adopts following technical scheme:
A kind of photovoltaic storage battery combining inverter improves and site power factor controlling system, specifically provide a kind of based on hierarchy system, control system comprises top level control and bottom control, and wherein top level control is that system operating mode is selected, lower floor's controller parameter is given; Lower floor controls as accumulator cell charging and discharging control, inverter inner and outer ring control.Control system according to present sample data (maximum power of photovoltaic cell, load power, mains supply power) and system nominal capacity, realize flexible control inverter export active reactive namely at active power of output as far as possible simultaneously by providing reactive power to improve and site power factor.Switching circular current in control indirectly by the inter mode controlling power outer shroud and MPPT outer shroud avoids power system capacity out-of-limit.Utilize accumulator cell charging and discharging to improve photovoltaic cell utilance and realize system whole day and run without interruption.
Described power system capacity is 100kVA, and site power factor standard is 0.85, and battery capacity is 800Ah.
Described control objectives is for ensureing and active power of output as far as possible premised on the power factor of site.Wherein utilize accumulator cell charging and discharging to improve photovoltaic cell utilance and realize system uninterrupted operation and provide reactive power compensation in real time.
Described emulation platform is Matlab/Simulink, and experimental system is based on the checking of dSPACE1103 realization theory and on-line debugging.
Specifically, there is following technology beneficial effect:
1) in system cloud gray model, utilization rate of equipment and installations is high;
2) bottom control technology is comparatively simple;
3) systems generate electricity cost is reduced;
4) power factor is significantly improved, and user power utilization economic benefit is improved;
5) system improves mains supply ability;
6) controling parameters can be revised online in real time.
Accompanying drawing explanation
Fig. 1 is based on photovoltaic storage battery power generation system structure figure.
Fig. 2 system cloud gray model flow chart.
Fig. 3 system running pattern switches figure.
Embodiment
Fig. 1 is based on photovoltaic storage battery power generation system structure figure, main structure circuit is primarily of photovoltaic cell, storage battery, two-way DC/DC, inverter, subnet load and electrical network etc., and wherein control system comprises top level control and is divided into the selection of data processing, system pattern, energy storage management, parameter calibration, bottom controller selection.Fig. 2 is system cloud gray model flow chart, is first judged and selective system operational mode by data sampling, then selection control provide controller reference value according to formula.Fig. 3 switches and status condition between each operational mode of system.Idiographic flow is as follows:
First, by sampled measurements mains supply power P g, Q g, load power P l, Q l, maximum power of photovoltaic cell P mpp, storage battery port voltage U bat, for different operating condition, by and site power factor meter calculates expectation reactive power Δ Q that inverter exports, inverter exports active reactive power given value P ref, Q ref:
(1) when photovoltaic cell Maximum Power Output is greater than 10kW:
1. when and site power factor is greater than 0.85 i.e. Δ Q≤0, invertor operation is under unity power factor state, and photovoltaic cell operates in maximum power point.
2. when and site power factor lower than 0.85 and inverter export apparent power do not reach its rated capacity time, export apparent power and active reactive power relation characteristic from Fig. 3 inverter, now expect reactive power wherein S is inverter rated capacity; Inverter exports idle equaling and expects reactive power Δ Q, and its size is such as formula shown in (1), and photovoltaic cell operates in maximum power point.
3. when and site power factor lower than 0.85 and inverter export apparent power exceed its rated capacity time, namely therefore for improving and site power factor, require that inverter sends more reactive power, now inverter active power control model must be switched to permanent real power control by MPPT, increase idle output by reducing inverter active output, wherein inverter exports active reactive power given value P ref, Q refbe calculated as follows.Because and site power factor is determined by load and photovoltaic generating system, measures load power Q l, P l, then inverter active power reference value is solved.From formula (1), Q ref=Δ Q=Q l-P g *tan (arcos0.85).Now detect storage battery the need of charging, if so, then photovoltaic can be sent electricity remainder and be charged to storage battery as far as possible.
4. when and site power factor lower than 0.85 and Δ Q > S time, load or burden without work demand is comparatively large, and now inverter output reactive power maximum is inverter rated capacity, and inverter exports that to gain merit be 0.I.e. Q ref=S.Detect storage battery the need of charging simultaneously, if so, then photovoltaic can be sent electricity and be charged to storage battery as far as possible.
(2) at photovoltaic cell due to when illumination is not enough or night, Maximum Power Output was lower than 10kW, be that inversion system is powered by storage battery, ensure that DC bus terminal voltage is in working range, makes inverter can continue to send demand reactive power.
If 1. battery tension U bat< U bat min, then system stalls.
2. when and site power factor is greater than 0.85 time Δ Q < 0, inverter exports active reactive and is 0.
3. when inverter power factor is less than 0.85 and inverter exports 0 < Δ Q < S when apparent power does not reach its rated capacity, inverter output reactive power set-point is such as formula shown in (1).
4. when and site power factor lower than 0.85 and inverter export apparent power exceed its rated capacity and Δ Q > S, now inverter output reactive power set-point is Q ref=S.
Q ref＝ΔQ＝Q L-P G*tan(arccos0.85) (1)
Q G P G = Q L - S 2 - P * 2 P L - P * = tan ( arccos 0.85 ) - - - ( 2 )
P ref = - k ( Q L - k P L ) + k 2 ( Q L - k P L ) 2 - ( k 2 + 1 ) ( ( Q L - k P L ) 2 - S 2 ) k 2 + 1 - - - ( 3 )
Wherein, k=tan (arcos0.85), 0≤P ref≤ S, 0≤Q ref≤ S.

Claims (5)

1. one kind is improved and site power factor controlling system based on photovoltaic storage battery combining inverter, described control system comprises top level control and lower floor controls: top level control is that selective system pattern and parameter are given, and lower floor controls as accumulator cell charging and discharging controls and inverter inner and outer ring controller.
2. control according to claim 1 adopts hierarchical control thought, takes into full account photovoltaic plant operating condition, with calibrating parameters with adopt data for criterion in real time, and selective system operational mode, each controller parameter of given inner ring P ref, Q refand accumulator cell charging and discharging electric current, voltage.
3. power system capacity according to claim 1 is 100kVA, and site power factor standard is 0.85, and battery capacity is 800Ah.
4. to avoid invertor operation out-of-limit for real-time switching inverter control outer shroud MPPT according to claim 1 and PQ controller, namely ensures and active power of output as far as possible premised on the power factor of site.Utilize accumulator cell charging and discharging to improve photovoltaic cell utilance and realize system whole day and run without interruption.
5. emulation platform according to claim 1 is Matlab/Simulink, and experimental system is based on the checking of dSPACE1103 realization theory and on-line debugging.
CN201410697362.0A 2014-11-24 2014-11-24 Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter Pending CN104716655A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410697362.0A CN104716655A (en) 2014-11-24 2014-11-24 Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410697362.0A CN104716655A (en) 2014-11-24 2014-11-24 Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter

Publications (1)

Publication Number Publication Date
CN104716655A true CN104716655A (en) 2015-06-17

Family

ID=53415727

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410697362.0A Pending CN104716655A (en) 2014-11-24 2014-11-24 Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter

Country Status (1)

Country Link
CN (1) CN104716655A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305430A (en) * 2015-11-06 2016-02-03 重庆大学 Power quality promotion method of light storage power generation system based on hierarchical control
CN108539757A (en) * 2018-05-09 2018-09-14 北京交通大学 The reactive power dispatching method of power distribution network light accumulation
CN110915090A (en) * 2017-05-15 2020-03-24 戴纳动力有限责任公司 Method and system for extracting excess power

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘东等: ""多功能光伏-蓄电池发电***为大电网提供频率支撑的仿真设计"", 《天津工业大学学报》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305430A (en) * 2015-11-06 2016-02-03 重庆大学 Power quality promotion method of light storage power generation system based on hierarchical control
CN105305430B (en) * 2015-11-06 2019-05-07 重庆大学 Light based on hierarchical control stores up electricity generation system power quality method for improving
CN110915090A (en) * 2017-05-15 2020-03-24 戴纳动力有限责任公司 Method and system for extracting excess power
CN110915090B (en) * 2017-05-15 2023-10-24 戴纳动力有限责任公司 Method and system for extracting redundant power
US11936187B2 (en) 2017-05-15 2024-03-19 Dynapower Company Llc Method and system for extracting excess power
CN108539757A (en) * 2018-05-09 2018-09-14 北京交通大学 The reactive power dispatching method of power distribution network light accumulation

Similar Documents

Publication Publication Date Title
CN103427430B (en) A kind of energy management method of mixed energy storage system in microgrid
CN102983589B (en) Control method of grid friendly type distributed power source based on hybrid energy storage
CN103501006B (en) Micro-capacitance sensor centralized control method
CN105226632A (en) A kind of multi-mode of DC micro power grid system switches control method for coordinating
CN102916481A (en) Direct-current microgrid system and energy management method thereof
CN112803573A (en) Wind-solar-hydrogen storage complementary uninterrupted power supply system
CN106026168B (en) The energy management strategies of honourable energy storage wisdom energy tower
CN103997046A (en) Switching control method of energy storage unit of box-type energy storage substation
CN103595071A (en) Energy system of micro-grid
CN105811458A (en) Microgrid energy storage system and energy management method thereof
CN104218612B (en) Based on micro-power grid flexible grid-connected control method of the integrated control in points of common connection place
CN107482659B (en) Exchange mixed energy storage system control method for coordinating under micro-capacitance sensor off-network state
CN103560533B (en) The method and system of the level and smooth wind light generation fluctuation of energy-accumulating power station are controlled based on rate of change
CN103337886B (en) Industrial park wind-light storage micro-grid system
CN203377599U (en) Household wind solar energy storage micro-grid control system
CN104716655A (en) Control system for improving grid connection point power factor of photovoltaic storage battery grid-connected inverter
CN204835684U (en) Mix energy storage power conversion equipment
CN203086161U (en) Distributed power generation coordinated control system
Xu et al. Energy management and control strategy for DC micro-grid in data center
CN104281984A (en) Power supply method for microgrid economical operation
CN102005807A (en) Method for regulating photovoltaic power generation system through super capacitor energy storage system
Sharma et al. Comparative analysis of different types of micro-grid architectures and controls
CN109904875B (en) Micro-grid energy management method containing fuel cell power generation device
CN111030182A (en) Micro-grid electric energy monitoring system
Yeting et al. Application of island microgrid based on hybrid batteries storage

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20150617