Stable control system for photovoltaic grid-connected electric power generation system

• Main Authors: YANG WEIWEI, ZHANG YING, WANG WEIRU, DUAN WEIWEN, HAO XINJIE, ZHENG HUIPING, QU YING, XUE MIN, SONG SHUYONG, SHI XINCONG, LIU XINYUAN
• Format: Patent
• Language: English
• Published: 11.02.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-REDRADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, E.G. USINGPHOTOVOLTAIC [PV] MODULES; SYSTEMS FOR STORING ELECTRIC ENERGY

The utility model discloses a stable control system for a photovoltaic grid-connected electric power generation system. The stable control system comprises a photovoltaic array, a direct-current converter (voltage step-up chopper), a stable control module, an inverter and an alternating current power grid. The stable control module comprises a voltage collector, a Buck/Boost type (voltage step-up and voltage step-down) bidirectional converter, a storage battery, a data collection and conversion module, a stable controller (CPU) and a trigger unit of an electronic switch device in the bidirectional converter. Controlled variables of the stable control system comprise storage battery charge state which is absent in controlled variables of a conventional controller, accuracy of storage battery actual state collection can be improved, the Buck/Boost type (voltage step-up and voltage step-down) bidirectional converter is adopted in a control circuit, an IGBT which is great in performance is adopted as the electronic switch device, and therefore the control precision of the stable control system is improved; output stability of the photovoltaic grid-connected electric power generation system is guaranteed.