GRID CONNECTED PHOTOVOLTAIC INVERTER AND CONTROLLING METHOD THEREOF

The present specification relates to a grid-connected photovoltaic inverter and a control method of the same, wherein the inverter detects a load-side unbalanced current and processes the current through P-Q conversion, then extracts only a ripple value and calculates a compensation current, and com...

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Bibliographische Detailangaben
1. Verfasser:	KIM, HO YEOL
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	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 CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	The present specification relates to a grid-connected photovoltaic inverter and a control method of the same, wherein the inverter detects a load-side unbalanced current and processes the current through P-Q conversion, then extracts only a ripple value and calculates a compensation current, and compensates for the reference current of a current controller. According to the present specification, the grid-connected photovoltaic inverter is coupled with a load and includes: a voltage controller to perform PI control over a DC link voltage provided by a DC link voltage controller; a current controller to control currents based on d and q reference currents converted from the DC link voltage and based on the compensation current calculated when detecting the unbalance of the load; and a PWM signal generation part to generate a PWM signal based on a voltage converted from the current controller.