Projects:2019s1-191 Microcontrollers for the Measurement of Power Quality

Introduction

Power quality is a measurement of standard reliability of voltage, frequency, pure sinusoidal waveform and uninterrupted supply in electric power systems. As power network evolves, involving the usage of non-linear loads in power networks which made the power quality problem becomes more acute which is the possible of a part of power network become disengaged or known as "islanded". The islanding power network may cause issues on voltage and frequency which the problem in electric power system can be indicated by the changes of Rate of Change of Frequency (RoCoF) which could indicate instability in power systems. On the other hands, the recent development of microelectronics which made powerful computational power available at very low cost. There are much more possible ways to reduce this problems and one of those is by early detection which this project is to make an early indicator to detect Rate of Change of Frequency (RoCoF) using a microcontroller with embedded Phase-Locked Loop integrated circuit to estimate Rate of Change of Frequency (RoCoF) by measuring Real and Reactive Power, Power Factor, Power Angle and Harmonics.

Project Team

Students

• Tony Chen
• Hafiz Syahmi Hanizar
• Muhammad Haziem Rosdi

Supervisor

Dr. Andrew Allison

Definitions and Abbreviations

• RoCoF = Rate of Change of Frequency

Aim

To measure Real and Reactive Power, Power Factor, Phase difference for estimating Rate of Change of Frequency. This project is also intended for proposing possible alternative for measuring RoCoF at low costs by implementing analog electronics with micro-controller.

Background

Power Quality

Power Quality is a standard requirement for measuring the reliability of the power delivered to consumers, which the parameters are voltage, frequency, harmonics in waveform, and service availability including Real and Reactive Power, Power Factor and Phase Angle.

Signal Processing

This project implemented Walsh Function which is known as square-wave function where the maximum and minimum amplitude would be at +1 and -1 respectively. Walsh Function helps to reduce the amount of computational load, where the calculation involved is simpler than Fourier Transform for signal measurement.

Phase-Locked Loop

Phase-Locked Loop is a feedback control loop circuit which is used to adjust and match the frequency of input signal. The Phase-Locked Loop consists of three main component which are Phase Detector, Low-Pass Filter and Voltage-Controlled Oscillator.

Method

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Results

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Conclusion

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References

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