Voltage and Stabilization Signals The Resulting Distributed Control A New Distributed Controller for DC Microgrids Stability Enhancement Voltage and Stabilization Signals DC Test System Why DC Microgrid? Less number of conversion No problem in voltage harmonics and reactive power High quality of voltage for sensitive dc loads DC BUS DC/AC DC/DC DC/AC AC/DC DC/DC AC BUS Permanent Magnet Synchronous Generator AC to DC converter DC to DC converter, A buck for the DC Resistive load Community Microgrid of UWM DC to DC converter, A buck for the supercapacitor Everything is modeled as a current source dependent on voltage (constant power). Main grid is considered as voltage source without converter. Simplification Stability of DC Microgrids Constant Power Loads (CPL) can endanger DC microgrid stability. An example of CPL: Tightly regulated converters of electric drives Traditional Lyapanov Equations controller Our Proposed Controller State Feedback Controller for The Simplified System 𝑋 =𝐴𝑋 𝑡 +𝐵𝑈 𝑡 The Resulting Distributed Control The feedback system can guarantee microgrid stability only if the interaction between all elements are modeled DC circuit breakers Converter Controllers Switching Effects Literature Review This shows the idea of distributed control. None of these controllers have access to other controller measurements. Small Signal Stability Active Damping Virtual Impedance Large Signal Stability Central Controllers Multi Agent Controllers Controller Design Less contribution from the loads the least possible disturbance in all system signals Objective Function U(t) is designed to make the system stable and linear and provides the best solution for minimizing an objective function. AC to DC interface controller Total microgrid spate space linear equations Optimization with the constraint of distributed control State-space Average Model: Converter Modeling The Resulting K Solve the optimization for accurate model Implement the controller in the community microgrid of UWM Apply the concept to AC microgrids Further work This makes the whole system stable with the least extra power injection signals. Supervisor: Rob Cuzner https://uwm.edu/engineering/people/cuzner-ph-d-robert/ Author: Marzieh Karami Questions? Email: karami@uwm.edu