Study On The Single-phase Unipolar Z-source Inverter For Off-grid Type Wind Power Generation

The inverter is often used as a power electronic device in the power conversionprocess, and its primary role is to the battery stored in or by the rectifier bridge outputDC into AC load that can be used. Inverter for small wind power systems are runindependently most of the voltage-type single-phase bridge inverter. Inverter used inwind power generation requires high efficiency light load efficiency is higher becauseof the wind power generation system is often run in a no-load condition. Further, sincethe input of the battery voltage with the charge, the discharge state changes largerchanges, which requires the inverter can be provided in a larger DC voltage changeswithin normal working, but also to ensure the stability of the output voltage.Voltage or frequency changes away from the energy emitted by the comb the windpower generation system, the voltage range from tens of volts to several hundred volts,which gives inverter design has brought great difficulties, and from comb the windpower supply object is more complex, existing wind power inverter voltage sourceinverter for wind power generation system away from the net load conditions and powersupply mode, the voltage source inverter has the following drawbacks:â‘ In theory, itcan only be suitable for inductive load.â‘¡momentary shorts phenomenon occurs in thepresence of interference, leg have occurred, resulting in damage to the bridge arm, highfailure rate.â‘¢voltage source inverter output voltage is lower than the input voltage, thevoltage source inverter is a buck inverter.In this paper, the power away from the net wind characteristics, Peng Founderscholars have proposed a new type of inverter circuit-Z-source inverter circuit,compared to traditional inverters, Z-source inverter has its unique First Z The source ofthe inverter power supply can be the voltage source, but also for the current source.Therefore, the traditional voltage or current source inverter Z-source inverter DC powersupply can be arbitrary. Secondly, the Z-source inverter inductive or capacitive load.Suitable for a variety of characteristics in a wide range of load type. Z-source invertercan boost can also buck, Buck-Boost characteristics, therefore eliminating the need fortraditional inverter DC-DC link, simplified circuit structure, reducing the failure rate. Inaddition, Z-source inverter allows the the common conduction and of state off, will notcause excessive damage to the device, saving the cost of production.Z-source inverter control circuit, the feedback circuit main design, all the advantages of the Z-source inverter verified by actual experiment, this circuit and willbe applied to the actual wind power...