1. Presenter: Sean Cunningham
Theory, Simulation, and Implementation of Grid Connected Back to Back Converters Utilizing Voltage Oriented Control
Presenter: Sean Cunningham

2. Overview Goal: connect two power systems for the exchange of power
Project installation resides at UW-Milwaukee’s USR building
Indirect AC/AC Conversion for decoupling the two power systems
Controlling the amplitude and phase angle
System dynamic model and Voltage Oriented Control

3. Controller Design
From the system dynamic models transfer functions were developed for the current and voltage controllers as well as the phase-locked loop
Optimization method Symmetrical Optimum for tuning of voltage controller and phase-locked loop
Optimization method Modulus Optimum used for tuning of the current controller

4. Project Implementation
Harmonic current allowance at Point of Common Coupling from IEEE standard
Inductance of the reactor by selecting range of current
Maximum DC bus voltage
Converter harmonic voltage spectrum
Minimum required converter switching frequency

5. Software Implementation and Testing
Software implementation and testing originated in MathWorks Simulink environment
Code generation for Texas Instruments C2000 Series Digital Signal Processor
Only core Simulink blocks were used in the development of code for possibly deploying to other DSPs

6. Analytical vs. Simulation Harmonics

7. Measured Harmonics
Converter harmonic voltage spectrum consistent across analytical, simulation, and measured results
Measured harmonic currents slightly higher than analytical and simulation results