scholarly journals The Impact of Primary Frequency Control of WTs on Ultra-Low Frequency Oscillation

2021 ◽  
Vol 1748 ◽  
pp. 042023
Author(s):  
Lei Yang ◽  
Xiaojie Zhang ◽  
Wei Huang ◽  
Chen Wu ◽  
Shengnan Li ◽  
...  
Keyword(s):  
Frequency Control ◽  
Low Frequency ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Primary Frequency ◽  
Primary Frequency Control ◽  
The Impact

scholarly journals An Efficient Adaptive Virtual Inertia Controller for Virtual Synchronous Generators

2020 ◽  
Author(s):  
Mostafa Malekpour ◽  
Arash Kiyoumarsi ◽  
Mehdi Gholipour
Keyword(s):  
Power Systems ◽  
Frequency Control ◽  
Low Frequency ◽  
Adaptive Strategy ◽  
Synchronous Generators ◽  
Low Frequency Oscillation ◽  
Virtual Inertia ◽  
Primary Frequency ◽  
Primary Frequency Control ◽  
Oscillation Damping

This paper proposes an efficient adaptive strategy to control virtual inertia of virtual synchronous generators. This adaptive virtual inertia can provide low frequency oscillation damping and simultaneously improve primary frequency control in power systems. <br>

scholarly journals An Efficient Adaptive Virtual Inertia Controller for Virtual Synchronous Generators

2020 ◽  
Author(s):  
Mostafa Malekpour ◽  
Arash Kiyoumarsi ◽  
Mehdi Gholipour
Keyword(s):  
Power Systems ◽  
Frequency Control ◽  
Low Frequency ◽  
Adaptive Strategy ◽  
Synchronous Generators ◽  
Low Frequency Oscillation ◽  
Virtual Inertia ◽  
Primary Frequency ◽  
Primary Frequency Control ◽  
Oscillation Damping

This paper proposes an efficient adaptive strategy to control virtual inertia of virtual synchronous generators. This adaptive virtual inertia can provide low frequency oscillation damping and simultaneously improve primary frequency control in power systems. <br>

The Impact of Wind Generation on Low Frequency Oscillation in Power Systems

2021 ◽  
Author(s):  
Mohammad M. Almomani ◽  
Abdullah Odienat ◽  
Seba F. Al-Gharaibeh ◽  
Khaled Alawasa
Keyword(s):  
Power Systems ◽  
Low Frequency ◽  
Wind Generation ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
The Impact

scholarly journals Impact of Primary Frequency Control of Offshore HVDC Grids on Interarea Modes of Power Systems

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3879 ◽  
Author(s):  
Ali Bidadfar ◽  
Oscar Saborío-Romano ◽  
Vladislav Akhmatov ◽  
Nicolaos A. Cutululis ◽  
Poul E. Sørensen
Keyword(s):  
Power Systems ◽  
Frequency Control ◽  
Wind Farms ◽  
Offshore Wind ◽  
Offshore Wind Farms ◽  
Dc Voltage ◽  
Simultaneous Use ◽  
Primary Frequency ◽  
Primary Frequency Control ◽  
The Impact

Offshore high-voltage DC (HVDC) grids are developing as a technically reliable and economical solution to transfer more offshore wind power to onshore power systems. It is also foreseen that the offshore HVDC grids pave the way for offshore wind participation in power systems’ balancing process through frequency support. The primary frequency control mechanism in an HVDC grid can be either centralized using communication links between HVDC terminals or decentralized by the simultaneous use of DC voltage and frequency droop controls. This paper investigates the impact of both types of primary frequency control of offshore HVDC grids on onshore power system dynamics. Parametric presentation of power systems’ electro-mechanical dynamics and HVDC controls is developed to analytically prove that the primary frequency control can improve the damping of interarea modes of onshore power systems. The key findings of the paper include showing that the simultaneous use of frequency and DC voltage droop controls on onshore converters results in an autonomous share of damping torque between onshore power systems even without any participation of offshore wind farms in the frequency control. It is also found that the resulting damping from the frequency control of offshore HVDC is not always reliable as it can be nullified by the power limits of HVDC converters or wind farms. Therefore, using power oscillation damping control in parallel with frequency control is suggested. The analytical findings are verified by simulations on a three-terminal offshore HVDC grid.

The Impact of Hydro-Turbine and its Governor System on Power System Low Frequency Oscillation

2012 ◽  
Vol 614-615 ◽  
pp. 875-879
Author(s):  
Jian Guo Zhu
Keyword(s):  
Power System ◽  
Transient Stability ◽  
Mechanical Load ◽  
Low Frequency ◽  
Hydraulic Turbine ◽  
Small Signal Stability ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Hydro Turbine ◽  
The Impact

This paper studies the effect of the soft feedback in hydro-turbine and its governor system on power system transient stability. Low frequency oscillation phenomenon in which the hydraulic turbine sets participate occurred on power system many times this year, which with no mechanism discovered. In this paper, we first study the effect of mechanical load moment output of the prime mover system on the mechanism of low frequency oscillations, then by analysis of small-signal stability on hydro-turbine and its governor system and simulation experiments on an two-generator power system using PSASP, we come to the conclusion that: If the soft feedback output values of hydro-turbine governor systems are set small in the power system, it will come to the unstable oscillation condition.

scholarly journals Suppression Research Regarding Low-Frequency Oscillation in the Vehicle-Grid Coupling System Using Model-Based Predictive Current Control

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1803 ◽  
Author(s):  
Yaqi Wang ◽  
Zhigang Liu
Keyword(s):  
High Speed ◽  
Low Frequency ◽  
Current Control ◽  
Control Voltage ◽  
Continuous Control ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Model Based ◽  
Coupling System ◽  
The Impact

Recently, low-frequency oscillation (LFO) has occurred many times in high-speed railways and has led to traction blockades. Some of the literature has found that the stability of the vehicle-grid coupling system could be improved by optimizing the control strategy of the traction line-side converter (LSC) to some extent. In this paper, a model-based predictive current control (MBPCC) approach based on continuous control set in the dq reference frame for the traction LSC for electric multiple units (EMUs) is proposed. First, the mathematical predictive model of one traction LSC is deduced by discretizing the state equation on the alternating current (AC) side. Then, the optimal control variables are calculated by solving the performance function, which involves the difference between the predicted and reference value of the current, as well as the variations of the control voltage. Finally, combined with bipolar sinusoidal pulse width modulation (SPWM), the whole control algorithm based on MBPCC is formed. The simulation models of EMUs’ dual traction LSCs are built in MATLAB/SIMULINK to verify the superior dynamic and static performance, by comparing them with traditional transient direct current control (TDCC). A whole dSPACE semi-physical platform is established to demonstrate the feasibility and effectiveness of MBPCC in real applications. In addition, the simulations of multi-EMUs accessed in the vehicle-grid coupling system are carried out to verify the suppressing effect on LFO. Finally, to find the impact of external parameters (the equivalent leakage inductance of vehicle transformer, the distance to the power supply, and load resistance) on MBPCC’s performance, the sensitivity analysis of these parameters is performed. Results indicate that these three parameters have a tiny impact on the proposed method but a significant influence on the performance of TDCC. Both oscillation pattern and oscillation peak under TDCC can be easily influenced when these parameters change.

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