Title:
METHOD FOR CONTROLLING STRING INVERTER, CONTROLLER, INVERTER, AND INVERTER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/237755
Kind Code:
A1
Abstract:
The present application provides a method for controlling a string inverter, a controller, an inverter and an inverter system. The method comprises: in an IV curve scanning process, controlling the output power of an 0 inverter circuit to be a set power reference value, and controlling the output voltage of each non-IV curve scanning DC-DC circuit to be a set voltage reference value; the 0 set power reference value being less than or equal to the sum of the input power of the non-IV curve scanning DC-DC circuits before IV curve scanning, and the 0 set voltage reference value being greater than or equal to a preset percentage of the maximum value of an open circuit voltage of a photovoltaic string connected to the IV curve scanning DC-DC circuits before IV curve scanning; controlling the inverter circuit to maintain a constant output power and bus voltage without power fluctuations; and the non-IV curve scanning DC-DC circuits continuing to output power. The present invention effectively utilizes the electrical energy of photovoltaic power generation, avoiding waste of power generated.
Inventors:
YU XINYU (CN)
XIN KAI (CN)
LIU FANGCHENG (CN)
XIN KAI (CN)
LIU FANGCHENG (CN)
Application Number:
PCT/CN2019/074686
Publication Date:
December 19, 2019
Filing Date:
February 03, 2019
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H02J3/38
Foreign References:
| CN108879756A | 2018-11-23 | |||
| CN105871324A | 2016-08-17 | |||
| CN105827200A | 2016-08-03 | |||
| CN107612019A | 2018-01-19 | |||
| CN107689772A | 2018-02-13 | |||
| EP2658071A2 | 2013-10-30 | |||
| CN201810621957A | 2018-06-15 |
Other References:
See also references of EP 3764504A4
Attorney, Agent or Firm:
SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)
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