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1. WO2020133056 - CENTRAL AND DISTRIBUTED PHOTOVOLTAIC POWER PLANT AND CONTROL SYSTEM THEREFOR

Publication Number WO/2020/133056
Publication Date 02.07.2020
International Application No. PCT/CN2018/124328
International Filing Date 27.12.2018
IPC
H02J 3/01 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
01Arrangements for reducing harmonics or ripples
CPC
H02J 2300/26
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
2300Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
20The dispersed energy generation being of renewable origin
22The renewable source being solar energy
24of photovoltaic origin
26involving maximum power point tracking control for photovoltaic sources
H02J 2300/40
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
2300Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
40wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
H02J 3/381
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
381Dispersed generators
H02M 3/156
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS 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
3Conversion of dc power input into dc power output
02without intermediate conversion into ac
04by static converters
10using discharge tubes with control electrode or semiconductor devices with control electrode
145using devices of a triode or transistor type requiring continuous application of a control signal
155using semiconductor devices only
156with automatic control of output voltage or current, e.g. switching regulators
H02M 3/33584
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS 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
3Conversion of dc power input into dc power output
22with intermediate conversion into ac
24by static converters
28using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
325using devices of a triode or a transistor type requiring continuous application of a control signal
335using semiconductor devices only
33569having several active switching elements
33576having at least one active switching element at the secondary side of an isolation transformer
33584Bidirectional converters
H02M 3/337
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS 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
3Conversion of dc power input into dc power output
22with intermediate conversion into ac
24by static converters
28using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
325using devices of a triode or a transistor type requiring continuous application of a control signal
335using semiconductor devices only
337in push-pull configuration
Applicants
  • ABB SCHWEIZ AG [CH]/[CH]
  • LIU, Zhuoran [CN]/[CN] (UG)
  • YANG, Xiaobo [CN]/[CN] (UG)
  • HUANG, Xing [CN]/[CN] (UG)
Inventors
  • LIU, Zhuoran
  • YANG, Xiaobo
  • HUANG, Xing
Agents
  • BOSS & YOUNG PATENT AND TRADEMARK LAW OFFICE
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CENTRAL AND DISTRIBUTED PHOTOVOLTAIC POWER PLANT AND CONTROL SYSTEM THEREFOR
(FR) CENTRALE ÉLECTRIQUE PHOTOVOLTAÏQUE CENTRALE ET RÉPARTIE ET SON SYSTÈME DE COMMANDE
Abstract
(EN)
It is therefore an objective of the invention to provide a central and distributed photovoltaic power plant and its control system. The power plant incudes a plurality of DC to DC power conversion circuits, a DC to AC power conversion circuit, a DC bus arranged between outputs of the plurality of DC to DC power conversion circuits and input of the DC to AC power conversion circuit, a power meter being configured to measure power supplied by the DC to AC power conversion circuit, and a control system; the control system is configured to control the DC to AC power conversion circuit to change the DC bus voltage in a direction, selectively control the plurality of the DC to DC power conversion circuits such that the one with its PV string MPP voltage deviating from the DC bus voltage in a first direction performs MPPT of its PV string and the one with its PV string MPP voltage deviating from the DC bus voltage in a second direction opposite to the first direction suspends switching conducting current from its PV string to the DC bus, and monitor a trend of the power measurement from the power meter, and further suspend the change of the DC bus voltage in case that the trend changes. By using a solution according to present invention, DCOs can be determined based on the output power measurement to work to regulate PV string at MPPT or just be bypassed. So, a global optimal DC bus voltage can be achieved at the maximum energy yield of PV station. In this case, DC optimizers and inverter both do MPPT to maximize the energy harvesting, which is defined as dual MPPT here and employed.
(FR)
Un objectif de l’invention est donc de réaliser une centrale électrique photovoltaïque centrale et répartie et son système de commande. La centrale électrique inclut une pluralité de circuits de conversion de puissance de CC en CC, un circuit de conversion de puissance de CC en CA, un bus en CC agencé entre des sorties de la pluralité de circuits de conversion de puissance de CC en CC et l’entrée du circuit de conversion de puissance de CC en CA, un wattmètre servant à mesurer la puissance fournie par le circuit de conversion de puissance de CC en CA, et un système de commande ; le système de commande sert à commander au circuit de conversion de puissance de CC en CA de changer la tension de bus en CC dans un sens, à commander sélectivement la pluralité de circuits de conversion de puissance de CC en CC de sorte que celui dont la tension MPP de chaîne PV s’écarte de la tension de bus en CC dans un premier sens procède au MPPT de sa chaîne PV et que celui dont la tension MPP de chaîne PV s’écarte de la tension de bus en CC dans un deuxième sens opposé au premier sens suspend la commutation de conduction de courant de sa chaîne PV vers le bus en CC, et à contrôler une tendance de la mesure de puissance par le wattmètre, et en outre à suspendre le changement de la tension de bus en CC dans le cas où la tendance change. En utilisant une solution selon la présente invention, des DCO peuvent être déterminés sur la base des mesures de puissance de sortie pour fonctionner afin de réguler la chaîne PV au MPPT ou simplement être dérivés. Ainsi, une tension de bus en CC optimale globale peut être obtenue au rendement énergétique maximal de la station PV. Dans ce cas, des optimiseurs de CC et un onduleur procèdent tous deux à un MPPT pour maximiser la collecte d’énergie, ce qui est défini et employé ici en tant que MPPT double.
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