The Hybrid System Supervisory Controller (HSSC) is the heart of a hybrid micro power grid. The HSSC is a fully integrated control panel incorporating proprietary software that orchestrates the operation of a wide variety of power system components, including diesel generators, wind turbines, photo-voltaic arrays, secondary loads, and energy storage devices. The HSSC also provides data-logging, report generation, and remote monitoring capability, thereby ensuring the long term viability and supportability of our remote systems.
The SLC product line has recently been extended to include a Water Pumping Secondary Load Controller that controls a variable speed water pump so as to provide continuous real-time control the water pumping electric load. This may be used, for example, to match the load of a large irrigation pump, to the fluctuating power output of a wind turbine, thereby minimizing the need for diesel backup or energy storage.
Synchronous condensers are a well-established technology for providing reactive power and correcting power factor in industrial settings. Sustainable Power Systems’ Synchronous Condensers are specially designed to meet the needs of hybrid renewable power systems. When paralleled with diesel generators, they assist the diesels in regulating voltage. During high wind and/or solar periods, the diesel generators are turned off, and the Synchronous Condenser handles voltage control on its own.
Our Synchronous Condenser Controller (SCC) allows a renewable energy hybrid system to operate at proper voltage when the backup generator is switched off, or is operated near unity power factor when paralleled with a generator. A digital voltage regulator adjusts the DC field current of the synchronous generator to control the terminal voltage. When operating in parallel with the backup generator (or electric grid) the adjustment of the DC field current controls reactive power on the lines, maximizing the amount of work that can be done with the power delivered.
The SCC can be controlled remotely by a supervisory controller or locally with the touch screen interface. The touch screen operation is limited to the parallel configuration mentioned above for quality control and safety reasons. The SCC actively monitors for fault conditions and will automatically shut down the synchronous generator if necessary.
Energy storage (usually batteries or flywheels) is increasingly used in renewable hybrid power systems to increase reliability of supply, improve power quality, and minimize diesel run time and fuel consumption. Unlike most large energy storage power converters, which must be grid-connected to operate, we work with carefully selected third party power converters that are specifically designed for off-grid applications, where they can either be paralleled with diesel generators or operate standalone. When integrated with our hybrid system supervisory controller, we use proprietary algorithms to manage battery state of charge and maximize battery life. We also plan to leverage our expertise in storage systems to develop storage converters for on-grid distributed generation applications, allowing the Company to expand its market and participate in the Smart Grid revolution.