Title:
CENTRAL AND DISTRIBUTED PHOTOVOLTAIC POWER PLANT AND CONTROL SYSTEM THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/133056
Kind Code:
A1
Abstract:
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.
Inventors:
LIU ZHUORAN (CN)
YANG XIAOBO (CN)
HUANG XING (CN)
YANG XIAOBO (CN)
HUANG XING (CN)
Application Number:
PCT/CN2018/124328
Publication Date:
July 02, 2020
Filing Date:
December 27, 2018
Export Citation:
Assignee:
ABB SCHWEIZ AG (CH)
LIU ZHUORAN (CN)
YANG XIAOBO (CN)
HUANG XING (CN)
LIU ZHUORAN (CN)
YANG XIAOBO (CN)
HUANG XING (CN)
International Classes:
H02J3/01
Foreign References:
| US20140005845A1 | 2014-01-02 | |||
| CN207910469U | 2018-09-25 |
Attorney, Agent or Firm:
BOSS & YOUNG PATENT AND TRADEMARK LAW OFFICE (CN)
Download PDF: