A Suboptimal Power-Point-Tracking-Based Primary Frequency Response Strategy for DFIGs in Hybrid Remote Area Power Supply Systems

2016 ◽  
Vol 31 (1) ◽  
pp. 93-105 ◽  
Author(s):  
Yingjie Tan ◽  
Lasantha Meegahapola ◽  
Kashem M. Muttaqi
Keyword(s):  
Frequency Response ◽  
Power Supply ◽  
Remote Area ◽  
Response Strategy ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point ◽  
Primary Frequency ◽  
Primary Frequency Response ◽  
Supply Systems

scholarly journals An Enhanced Frequency Response Strategy of a DFIG Based on Over-Speed De-Loaded Curve

2021 ◽  
Vol 11 (19) ◽  
pp. 9324
Author(s):  
Yien Xu ◽  
Hongmei Wang ◽  
Dejian Yang
Keyword(s):  
Frequency Response ◽  
Wind Power ◽  
Rate Of Change ◽  
Operating Conditions ◽  
Response Strategy ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point ◽  
Doubly Fed

The increasing level of wind power penetration is seriously threatening the frequency stability of the power system. In this article, we suggest an enhanced frequency response strategy of a doubly fed induction generator (DFIG) based on over-speed de-loaded curve using a novel power function to boost the frequency nadir and settling frequency and reduce the maximum rate of change of frequency (ROCOF) with more efficiency. To achieve this objective, the reference power increases to the torque limit at the de-load operating point and then decreases with the rotor speed toward the maximum power point tracking operating conditions. The simulation results on various wind power penetrations clearly demonstrated that the enhanced frequency response strategy is beneficial to boosting the frequency nadir and settling frequency and reduce the ROCOF.

scholarly journals Design of Photovoltaic Power Supply MPPT Circuit for WSN Node Based on Current Observation

2018 ◽  
Vol 14 (07) ◽  
pp. 45 ◽  
Author(s):  
Lieping Zhang ◽  
Yanlin Yu ◽  
Hang Ma ◽  
Yu Zhang ◽  
Peng Cao
Keyword(s):  
Power Supply ◽  
Collection Efficiency ◽  
Maximum Power Point Tracking ◽  
Tracking Algorithm ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Photovoltaic Power ◽  
Power Point

In view of the problem of low energy collection efficiency and low efficiency of photovoltaic power supply modules in wireless sensor networks, a maximum power point tracking algorithm suitable for photovoltaic power supply of wireless sensor nodes is proposed. Firstly, the photovoltaic cell model is analyzed. Based on this, the traditional maximum power point tracking algorithm is analyzed. Combining with the advantages of disturbance observing method and load current maximization method, the problem of low working efficiency and low energy collection efficiency of functional modules is solved. Current observation method maximum power point tracking algorithm, and complete the relevant hardware circuit design. Experimental results show that the power consumption of MPPT circuit is low, and the efficiency caused by environmental factors is very small. The efficiency is kept above 90% and the overall system efficiency is about 87%, which provides a stable and reliable photovoltaic power supply for WSN nodes.

scholarly journals Primary Frequency Stability Support of a DFIG in Association With Pitch Angle Control

2022 ◽  
Vol 9 ◽  
Author(s):  
Xiuli Si ◽  
Xiaoxin Wu ◽  
Feng You ◽  
Hongliang Yuan ◽  
Yien Xu ◽  
...  
Keyword(s):  
Frequency Response ◽  
Pitch Angle ◽  
Frequency Stability ◽  
Response Strategy ◽  
Frequency Regulation ◽  
Electric Power Grid ◽  
Doubly Fed ◽  
Primary Frequency ◽  
Primary Frequency Response ◽  
System Frequency

For an electric power grid that has large penetration levels of variable renewable energy including wind generation and photovoltaics, the system frequency stability is jeopardized, which is manifest in lowering frequency nadir and settling frequency. This paper suggests an enhanced primary frequency response strategy of a doubly-fed induction generator (DFIG) in association with pitch angle control. The DFIG works in de-loaded operation with a certain reserve power via pitch angle control prior to disturbances for frequency regulation. To address this, a function of the pitch angle is employed that decreases the pitch angle with time to slowly feed the active power to the power gird. The simulation results demonstrate the effectiveness and feasibility of the proposed primary frequency response strategy including the settling frequency and frequency nadir.

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