Method to design controller gains for the voltage phase angle torque feed-back control system

Distributed Generation (DG) has changed the power generation system to small-scale instead of large-scale generation. The demanding issue with the interconnection of DG is the detection of unintended islanding in a network. Several methods proposed in the literature show drawbacks such as high non-detection zones (NDZ) and higher tripping time. In this paper, the IEEE 13 bus distribution network with DGs like wind and solar power plants is integrated at two buses. Islanding is detected by utilizing data from a micro-synchrophasor located at the distribution grid and the DG. The micro-synchrophasor-based unintended islanding detection algorithm is based on parameters such as voltage, rate of change of voltage, frequency, rate of change of frequency, voltage phase angle difference and the rate of change of the voltage phase angle difference between the utility and the islanded grid. The proposed islanding detection algorithm discriminates between islanding and non-islanding conditions and is highly efficient under zero power mismatch conditions. The proposed method has null NDZ and satisfies the IEEE 1547 standard for DG tripping time. The effectiveness of the proposed IDM was verified when there are multiple DGs in the islanded grid. Also, the proposed method does not require additional hardware as it can be incorporated in digital relays with synchrophasor functionality.

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Synthesis of feedback control system by phase-angle loci

Transactions of the American Institute of Electrical Engineers Part II Applications and Industry ◽

10.1109/tai.1952.6371287 ◽

1952 ◽

Vol 71 (5) ◽

pp. 330-339 ◽

Cited By ~ 4

Author(s):

Yaohan Chu

Keyword(s):

Control System ◽

Feedback Control ◽

Phase Angle ◽

Feedback Control System

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Voltage phase angle variation in relation to wind power

IEEE PES General Meeting ◽

10.1109/pes.2010.5590001 ◽

2010 ◽

Cited By ~ 4

Author(s):

A J Allen ◽

S Santoso ◽

W M Grady

Keyword(s):

Wind Power ◽

Phase Angle ◽

Angle Variation ◽

Voltage Phase

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Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination

Energies ◽

10.3390/en11092421 ◽

2018 ◽

Vol 11 (9) ◽

pp. 2421

Author(s):

Xinxin Zheng ◽

Rui Zhang ◽

Xi Chen ◽

Nong Sun

Keyword(s):

Control System ◽

Phase Angle ◽

Digital Control ◽

Detection Method ◽

Frequency Drift ◽

Phase System ◽

Islanding Detection ◽

Detection Zone ◽

Three Phase ◽

Three Phase Inverter

This paper proposes an improved active frequency drift (AFD) islanding detection method of a three-phase inverter. Different than the existing single-phase AFD method, in the three-phase system, the disturbance is added to the phase angle, which takes part in coordinate transformation calculations. Thus, the frequency drift of the three-phase reference current can be realized by the disturbance of the phase angle. It is unnecessary to add frequency drift to each phase respectively with the proposed method, which can simplify the control system. Furthermore, the non-detection zone can be eliminated by updating certain parameters; therefore, the detection method is sensitive. In this paper, the application of the proposed method in a digital control system is discussed in detail. The non-detection zone is analyzed, and an elimination method is proposed. Finally, the simulation and experimental results are given to verify the theoretical analysis.

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