VOLTAGE-FREQUENCY CONTROL FOR HOME ENERGY SYSTEMS

An energy management system delivers power to a load during an islanded condition by operating a power converter that produces an AC output on a power line with a reference amplitude and a reference frequency. A controller directs the power converter to control the output by adjusting amplitude while maintaining the reference frequency, adjusting frequency while maintaining the reference amplitude, or adjusting amplitude and frequency together when conditions on the power line indicate a need for coordinated control. The system supports stable operation of an isolated AC bus by selecting between single-parameter and dual-parameter adjustment based on real-time electrical conditions and by modifying the output to supply appropriate real and reactive power to the load.