Mahendrakar Likhita 194G5A0207 Block diagram for single area power system without integral controller Mahendrakar Likhita 194G5A0207 Block diagram for single area power system with integral controller Mahendrakar Likhita 194G5A0207 Frequency response of single area power system without integral controller Mahendrakar Likhita 194G5A0207 Frequency response of single area power system with integral controller