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Promotion of renewable energy such as a photovoltaic generation (PV) is accelerated in the world; however, demand and supply balancing and voltage profile in power system may become worse by generation of renewable energy varied depend on weather condition. Therefore, alternative resources for demand and supply balancing and voltage regulation would be required and hydrogen supplying equipment known as power to gas (P2G), which can regulate active and reactive power by self-commutation type converter is considered as one of alternative resources. The authors focus on a microgrid including hydrogen supplying equipment for participating demand and supply regulation market and regulating voltage profile in power system. This paper proposes novel method to operate effective and economically for contributing demand and supply regulation and voltage regulation and reveals regulation ability and economic effects obtained by contributing power system operation through numerical case studies in microgrid interconnected to power system. [ABSTRACT FROM AUTHOR]