Effect, on automatic frequency control, of free oscillations of active power in power systems

1960 ◽  
Vol 1 (1) ◽  
pp. 1620-1624
Author(s):  
J. Kozuchowski
Keyword(s):  
Power Systems ◽  
Frequency Control ◽  
Active Power ◽  
Automatic Frequency ◽  
Free Oscillations ◽  
Automatic Frequency Control

scholarly journals An Autonomous Power-Frequency Control Strategy Based on Load Virtual Synchronous Generator

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 433 ◽  
Author(s):  
Jiangbei Han ◽  
Zhijian Liu ◽  
Ning Liang ◽  
Qi Song ◽  
Pengcheng Li
Keyword(s):  
Power Systems ◽  
Dynamic Stability ◽  
Control Strategy ◽  
Load Capacity ◽  
Frequency Control ◽  
Synchronous Generator ◽  
Active Power ◽  
Power Oscillation ◽  
Power Frequency ◽  
Virtual Synchronous Generator

With the increasing penetration of the hybrid AC/DC microgrid in power systems, an inertia decrease of the microgrid is caused. Many scholars have put forward the concept of a virtual synchronous generator, which enables the converters of the microgrid to possess the characteristics of a synchronous generator, thus providing inertia support for the microgrid. Nevertheless, the problems of active power oscillation and unbalance would be serious when multiple virtual synchronous generators (VSGs) operate in the microgrid. To conquer these problems, a VSG-based autonomous power-frequency control strategy is proposed, which not only independently allocates the power grid capacity according to the load capacity, but also effectively suppresses the active power oscillation. In addition, by establishing a dynamic small-signal model of the microgrid, the dynamic stability of the proposed control strategy in the microgrid is verified, and further reveals the leading role of the VSG and filter in the dynamic stability of microgrids. Finally, the feasibility and effectiveness of the proposed control strategy are validated by the simulation results.

scholarly journals Grid Code-Dependent Frequency Control Optimization in Multi-Terminal DC Networks

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6485
Author(s):  
Melanie Hoffmann ◽  
Harold R. Chamorro ◽  
Marc René Lotz ◽  
José M. Maestre ◽  
Kumars Rouzbehi ◽  
...  
Keyword(s):  
Power Systems ◽  
Frequency Response ◽  
Wind Power ◽  
Frequency Control ◽  
Active Power ◽  
High Voltage Direct Current ◽  
Control Optimization ◽  
The Stability ◽  
Primary Frequency ◽  
Primary Frequency Response

The increasing deployment of wind power is reducing inertia in power systems. High-voltage direct current (HVDC) technology can help to improve the stability of AC areas in which a frequency response is required. Moreover, multi-terminal DC (MTDC) networks can be optimized to distribute active power to several AC areas by droop control setting schemes that adjust converter control parameters. To this end, in this paper, particle swarm optimization (PSO) is used to improve the primary frequency response in AC areas considering several grid limitations and constraints. The frequency control uses an optimization process that minimizes the frequency nadir and the settling time in the primary frequency response. Secondly, another layer is proposed for the redistribution of active power among several AC areas, if required, without reserving wind power capacity. This method takes advantage of the MTDC topology and considers the grid code limitations at the same time. Two scenarios are defined to provide grid code-compliant frequency control.

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