Phase Angle Regulation Versus Impedance Control: Which Offers Greater Control Of Power Flow On the Grid?

Focus:

Power flow control in electric transmission lines has long been attempted with the use of a phase angle regulator (PAR). But PARs have performance limitations. Two decades ago, a new impedance regulation method was attempted using a mostly power electronics- based controller called a UPFC. Although the UPFC was not commercially successful due to high cost and component obsolescence issues, experience with this technology led to the development of the Sen Transformer (ST). This article presents a comprehensive analytical comparison of PARs and the ST (by the inventor of the latter), which will help utilities to make informed decisions when choosing power flow control solutions and may inspire power electronics engineers to develop more practical UPFCs. This article analyzes the effectiveness of each technique in terms of controlling power flow in a transmission line in the range of 0 to 2 per unit.

What you’ll learn:

• How to understand the operation of phase angle regulators and Sen Transformers in grid- level power flow control
• How to understand how performance of Sen Transformers compares with that of phase angle regulators in controlling power flow on the grid

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Author & Publication:

Kalyan K. Sen and Mey Ling Sen, Sen Engineering Solutions, Pittsburgh, Penn., How2Power Today, Feb 15 2017

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