[IEEE 2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) - Doha, Qatar (2018.4.10-2018.4.12)] 2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2018) - Operation of three-level single-phase half-bridge NPC inverter-based shunt active power filter under non-ideal grid voltage condition with sliding mode controller