18-10-2010, 12:23 PM
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POWER QUALITY
Summary
This Project comprises of 5 separate cases of Power Quality, Reactive Power and Modulated Power Filter Compensators. These cases have been modulated with and without compensation devices and have been simulated using both Matlab/Simulink and PSCAD software.
The 5 cases are as follows:
1. Power Quality Enhancement Using Modulated Power Filter
2. Power Quality Enhancement and Voltage regulation Using Modulated Power Filter
3. Power Quality Enhancement Using STATCOM
4. Power Quality Enhancement addressing the Tingle Voltage Issue
5. Power Quality Enhancement and Voltage regulation Using STATCOM
Detail information about the cases and digital simulation are shown under section 8.1.1 and under the Appendices A to E.
1. Background
The research course project EE6723 addresses the current issues of Electric Power Supply Pollution, Power Quality (PQ) and Harmonic Distortion Problems. The term “Power Quality” is in general a broad concept and is associated with electrical distribution and utilization systems that experience any voltage, current or frequency deviation from normal operation. For ideal electrical systems, the supplied power should have perfect current and voltage sinusoidal waveforms, being safe and reliable. But the reality is that the electric utilities controls the voltage levels and quality but are unable to control the current, since the load profile dictates the shape of the current waveform. Thus, the utility should maintain the bus voltage quality at all times. This simple consideration makes power quality (PQ) equal to voltage quality as shown in Figure 1.1
Defining precisely the Power Quality is a tremendous task; one of the common definitions is:
Definition 1: “Power quality is a summarizing concept, including different criteria to Judge the technical quality of an electric power delivery”. Another definition is developed and adopted by Ontario Hydro:
Definition 2: “Power Quality is the degree to which both the utilization and delivery of electric power affects the performance of electric equipment”.
In general there is no unique definition of power quality. The power quality problem can be viewed from two different angles related to each side of the utility meter, namely the Utility and the Consumer. An alternative definition of PQ is adopted: