Observer-Based Controller of Analytical Complex Systems: Application for a Large-Scale Power System

This proposal is aimed to overcome the problem that arises when diverse regulation devices and controlling strategies are involved in electric power systems regulation design. When new devices are included in electric power system after the topology and regulation goals were defined, a new design stage is generally needed to obtain the desired outputs. Moreover, if the initial design is based on a linearized model around an equilibrium point, the new conditions might degrade the whole performance of the system. Our proposal demonstrates that the power system performance can be guaranteed with one design stage when an adequate adaptive scheme is updating some critic controllers’ gains. For large-scale power systems, this feature is illustrated with the use of time domain simulations, showing the dynamic behavior of the significant variables. The transient response is enhanced in terms of maximum overshoot and settling time. This is demonstrated using the deviation between the behavior of some important variables with StatCom, but without or with PSS. A B-Spline neural networks algorithm is used to define the best controllers’ gains to efficiently attenuate low frequency oscillations when a short circuit event is presented. This strategy avoids the parameters and power system model dependency; only a dataset of typical variable measurements is required to achieve the expected behavior. The inclusion of PSS and StatCom with positive interaction, enhances the dynamic performance of the system while illustrating the ability of the strategy in adding different controllers in only one design stage.

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Influences of Large Scale Wind Farm Centralized Access on Power System Voltage Stability

2020 IEEE 5th Information Technology and Mechatronics Engineering Conference (ITOEC) ◽

10.1109/itoec49072.2020.9141915 ◽

2020 ◽

Author(s):

Guanliang Li ◽

Xiaocen Hu ◽

Yaguo Li ◽

Gang Yang ◽

Lu Bai

Keyword(s):

Power System ◽

Large Scale ◽

Voltage Stability ◽

Wind Farm

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The Flexible Operation of Coal Power and Its Renewable Integration Potential in China

Sustainability ◽

10.3390/su11164424 ◽

2019 ◽

Vol 11 (16) ◽

pp. 4424 ◽

Cited By ~ 2

Author(s):

Chunning Na ◽

Huan Pan ◽

Yuhong Zhu ◽

Jiahai Yuan ◽

Lixia Ding ◽

...

Keyword(s):

Renewable Energy ◽

Power Systems ◽

Power System ◽

Large Scale ◽

Renewable Integration ◽

Flexible Resources ◽

Feasible Option ◽

Coal Power ◽

Simulation Results ◽

Flexible Operation

At present time, China’s power systems face significant challenges in integrating large-scale renewable energy and reducing the curtailed renewable energy. In order to avoid the curtailment of renewable energy, the power systems need significant flexibility requirements in China. In regions where coal is still heavily relied upon for generating electricity, the flexible operations of coal power units will be the most feasible option to face these challenges. The study first focused on the reasons why the flexible operation of existing coal power units would potentially promote the integration of renewable energy in China and then reviewed the impacts on the performance levels of the units. A simple flexibility operation model was constructed to estimate the integration potential with the existing coal power units under several different scenarios. This study’s simulation results revealed that the existing retrofitted coal power units could provide flexibility in the promotion of the integration of renewable energy in a certain extent. However, the integration potential increment of 20% of the rated power for the coal power units was found to be lower than that of 30% of the rated power. Therefore, by considering the performance impacts of the coal power units with low performances in load operations, it was considered to not be economical for those units to operate at lower than 30% of the rated power. It was believed that once the capacity share of the renewable energy had achieved a continuously growing trend, the existing coal power units would fail to meet the flexibility requirements. Therefore, it was recommended in this study that other flexible resources should be deployed in the power systems for the purpose of reducing the curtailment of renewable energy. Furthermore, based on this study’s obtained evidence, in order to realize a power system with high proportions of renewable energy, China should strive to establish a power system with adequate flexible resources in the future.

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