Photovoltaic system capable of preventing PID effects

• Main Authors: HUANG GENGFENG, CHEN HENGLIU
• Format: Patent
• Language: English
• Published: 22.07.2015
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; BASIC ELECTRIC ELEMENTS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-REDRADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, E.G. USINGPHOTOVOLTAIC [PV] MODULES; SEMICONDUCTOR DEVICES

The invention discloses a photovoltaic system capable of preventing PID effects. The photovoltaic system comprises a photovoltaic component, an inverter and an anti-reflux controller, wherein the direct-current side of the inverter is connected with the photovoltaic component, the alternating-current side of the inverter is connected with a power grid, a negative boosting device is further connected between the inverter and the photovoltaic component, and the negative boosting device is used for increasing the negative-end voltage-to-ground of the photovoltaic component; the anti-reflux controller detects the power grid through a sampling module and controls the working states of the inverter and the negative boosting device through detecting signals. The photovoltaic system has the advantages that the front end of the inverter adopts the negative boosting device, the negative negative-end voltage-to-ground of the photovoltaic component is reduced or allowed to be not smaller than 0, the negative-end voltage-to-ground of the photovoltaic component is allowed to be small or positive, and the PID effects of the non-isolation single-phase inverter on the component are eliminated.