Photovoltaic inverter based on enhancement mode Z source network

• Main Authors: BAO JINGKUAN, GUO WEIMING, ZHANG QINGHAI, WANG LI, LIU ANHUA, WANG JUN, WANG XINTAO, LI HONGBO, CAI JUN, KONG PENG
• Format: Patent
• Language: English
• Published: 07.10.2015
• 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; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The utility model relates to a photovoltaic inverter based on enhancement mode Z source network, including boost boost circuit, enhancement mode Z source network, PWM contravariant bridge, photovoltaic array, boost boost circuit, enhancement mode Z source network, PWM contravariant bridge, three -phase load are connected in order, and can alternate the direct current of photovoltaic array output becomes the alternating current and can supply power for the three -phase load. Boost boost circuit realizes that photovoltaic array output maximum power follows the tracks of, and enhancement mode Z source network perhaps transmits the direct current chain with the energy storage of electric capacity in PWM contravariant bridge switching element opening and closing process. The utility model discloses the gain of stepping up is big, can be applied to low pressure input photovoltaic power occasion, under the same input condition, only need less direct duty cycle when exporting same voltage, consequently can maintain the higher modulation factor to reduce the voltage stress of switching element, improve the photovoltaic power generation the power output quality.