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The stability issues of cascade systems have been studied for many years. Impedance ratio type criterions in the form of Zo/Zi or Zi/Zo have been proposed to solve these stability issues. However, existing ratio type criterions still have problems in some cascade systems. Terminal characteristic of single module is studied and the different types of cascade system are defined in this paper. It can...
In cascade AC system, the interaction between converters and non-ideal source may cause instability issues, especially when the converters behave as constant power load. From the view of small signal model, the stability issues can be evaluated based on the relationship between the terminal impedance and admittance of sub-modules. Therefore, the stability criterion based on terminal impedance and...
Wind energy is now playing a very important role in the electrical power supply. With growing shares, the focus of the plant control is shifting from maximum power point tracking to also meet grid friendly aspects, like stable output power. This paper analyzed the power flow of wind power generation system equipped with permanent magnet synchronous generator. Wind torque feed-forward control based...
Impedance-based stability criterions have been proved to be a very effective tool for the stability assessment when considering interaction between different modules. Two different stability criterions in the form of impedance ratio as Zo/Zi and Zi/Zo have been proposed for different system. However, the intrinsic relationship of these criterions has not been fully discussed. In this paper, the terminal...
In this paper, the stability issues of multi-module distributed power system without interaction in control loop have been studied. Physical understanding of terminal characteristics of each module is focused. All the modules are divided into two groups based on the different terminal property type. Equivalent circuits of each group are established to analyze the stability issue. Then, mathematical...
The stability issues of cascade system have been studied for many years. Some classic criterions in the form of Zo/Zi like Middlebrook criterion has been proposed and the validity have been proved in the case like voltage source with a current sink. But they meet the challenge in some application, especially in the case of current source with voltage sink. In this paper, the stability issues of a...
The renewable energy has become the research focus in recent years with the environment-friendly characteristic. Integrating energy storage system to the renewable energy system can enhance the stability and reliability of the whole power system. As one of the core technologies, energy management of the hybrid energy storage system attracts more and more attention. Hybrid energy storage system can...
Wind farms are confronted with increasing demands for power quality and fail-safe operation at grid fault. State-of-art techniques applied to meet low voltage ride-through (LVRT) requirements for fix speed wind farms are blade pitching and dynamic reactive power compensation. Besides, breaking resistor and energy storage unit is also helpful to LVRT performance. However, these approaches have their...
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