Abstract
Numerous applications, such as the synchronization of distributed energy resources to an existing AC grid, the operation of active power filters or the amplification of signals for Power-Hardware-In-The-Loop (PHIL) systems require a few tasks in common. Amplitude, phase angle and frequency detection are crucial for all these applications and many more. Various techniques are presented for three-phase and single-phase applications but only a few of them are able to identify the signals’ attributes for a wide range of frequencies and amplitudes. Single-phase systems are typically burdensome, considering the challenge to create an internal signal, orthogonal with the input, in order to perform the phase angle detection. This matter is even more critical when the amplitude and frequency of the input signal varies in a wide range. This paper presents an Orthogonal Signal Generator (OSG) based on integral and derivative actions. It includes a detailed design procedure and a design example. The performance of a single-phase wide range amplitude and frequency detector based on the discussed OSG is experimentally validated under steady state and dynamic conditions.
Highlights
Amplitude, phase angle and frequency detection (APAF) are imperative for power electronics converters connected to the utility grid
A third and very important application of APAF is for Power Hardware-in-the-Loop (PHIL), where an external signal from a controller is given to a Power Amplifier (PA) [9,10,11,12,13,14,15,16] to test systems as a whole or just any parts or combinations of it, such as controllers, actuators, motors, drives or loads
This study focuses on the single-phase Phase-Locked Loop (PLL), which is more complex because an additional Orthogonal Signal Generator (OSG) is required to identify the phase angle, prior to the amplitude detection
Summary
Phase angle and frequency detection (APAF) are imperative for power electronics converters connected to the utility grid. A third and very important application of APAF is for Power Hardware-in-the-Loop (PHIL), where an external signal from a controller is given to a Power Amplifier (PA) [9,10,11,12,13,14,15,16] to test systems as a whole or just any parts or combinations of it, such as controllers, actuators, motors, drives or loads The challenge in this case is identifying the characteristics of the given external reference signal, especially when the PA is built using Switched Mode Power Amplifiers (SMPAs) or hybrid solutions with Linear Power Amplifiers (LPAs).
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