A Generalized Controller for Electric-Spring-Based Smart Load with Active and Reactive Power Compensation

With Electric Spring (ES) being practically evaluated by utility companies in the power grid, there is a need to explore its practical implementation aspects for general applications. In this paper, we propose three interior angle control principles for the electric spring. Systematic analysis and comparative study show that these three control principles lead to different smart load performance. The operating characteristic curves and distinctive features/advantages of the smart load using these three control methods are analyzed and explained. And a generalized controller structure suitable for the implementations of all these three angle control schemes is presented. It is practically shown that the same controller structure can be programmed to implement these three angle control strategies. This outcome is the first step to realize a programmable ES-based smart load for providing multiple functions.