Optimization of Unbalanced Three Phase Power Distribution Network

1. Optimization of Unbalanced Three Phase Power Distribution Network Ying Teng

2. Optimization of Unbalanced Three Phase Power Distribution Network • Motivation • Background • Project Goals • Reference • Current Process/Problem

3. Motivation • Deeply interested in renewable energy, hold the belief that the whole world will greatly rely on renewable energy in the near future • Topic is challenging to me, might be not able to achieve all the goals, but I will try. • At this stage, the more I learn the more interested I become into it

4. Background of three phase unbalanced problem • How does it become a problem? • What is the consequence? • Why worth researching?

5. Background--How does it become a problem? • A large number of unequal single phase loads or resources must be served by distribution network • And to make it worse, if these single phase loads or resources are using renewable energy, they sometimes would change dramatically, since it is unpredictable and unstable • Moreover, the fact is more and more people begin to use renewable energy

6. Background--What is the consequence? • List several consequences it might bring as examples • Substantial Voltage Drop in bus(if large amount of distributed energy resources suddenly kicked in) • Create heavy power flow in certain bus(overload or overheated) • Challenging to predict accurately and timely • Might cause falsely action of breaker or phase shifter and leads to bigger problem • Whole area might black out when hitting the threshold, as professor's example in California

7. Background--Why worth researching? • Provide a robust/high efficient/economic operating power grid by finding out the global optimal solution • Provide as a principle and criteria when a large amount of single phase renewable power source would connect to grid • Lots more, such as provide relatively quick and accurate solution for ISO

8. Project Goals • Review and catch up convex optimization fundamentals • Understand the papers professor suggested as much as possible • Use CVX to solve balanced power flow optimization in MATLAB • Duplicate the paper’s results in MATLAB, using toolbox like PSAT/CVX/Matpower

9. Project Goals • Trying to move one step forward • maybe add one more constrain • or trying to find out the limitation of the papers. • Trying to work in both directions: • network optimization • and power electronics equipment optimization • use more three phase inverter • improve its three phase balance • power quality monitoring unit to collect information about three-phase unbalance factor

10. Reference • Papers: • “Optimal Distributed Voltage Regulation in Power Distribution Networks”, University of California at Berkeley and University of Illinois at Urbana-Champaign • “Economic Dispatch in Unbalanced Distribution Networks via Semidefinite Relaxation”, University of Minnesota • Textbook • Lecture Notes • “Convex Optimization”, by Stephen Boyd, Stanford University; and LievenVandenberghe, University of California, Los Angeles • Guides • Matpower 4.1 User's Manual • The CVX Users’ Guide

11. Current Process/Problem • Review convex optimization fundamentals • Using MATLAB to understand and solve typical OPF cases • Read reference listed in previous slide • Understand Mathematic notations, equations and reasoning in papers • Build three phase unbalanced power network and adopt CVX to solve it in MATLAB • Much more…

12. Thank you