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 A Novel Photovoltaic Virtual Synchronous Generator Control Technology Without Energy Storage Systems

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2240
Author(s):  
Guangqing Bao ◽  
Hongtao Tan ◽  
Kun Ding ◽  
Ming Ma ◽  
Ningbo Wang
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Power Plants ◽  
Storage Systems ◽  
Synchronous Generator ◽  
Active Power ◽  
Energy Output ◽  
Energy Storage Systems ◽  
Factors Affecting ◽  
Virtual Synchronous Generator

Photovoltaic virtual synchronous generator (PV-VSG) technology, by way of simulating the external characteristics of a synchronous generator (SG), gives the PV energy integrated into the power grid through the power electronic equipment the characteristics of inertial response and active frequency response (FR)—this attracts much attention. Due to the high volatility and low adjustability of PV energy output, it does not have the characteristics of a prime mover (PM), so it must be equipped with energy storage systems (ESSs) in the DC or AC side to realize the PV-VSG technology. However, excessive reliance on ESSs will inevitably affect the application of VSG technology in practical PV power plants (PV-PPs). In view of this, this paper proposes the PV power reserve control type VSG (PV-PRC-VSG) control strategy. By reducing the active power output of part of the PV-PPs, the internal PV-PPs can maintain a part of the active power up/down-regulation ability in real time, instead of relying on external ESSs. By adjusting the active reserve power of this part, the output of the PV-PPs can be controlled within a certain range, and the PV-PPs can better simulate the PM characteristics and realize the FR of the grid by combining the VSG technology. At the same time, the factors affecting the reserve ratio are analyzed, and the position of the voltage operating point in PRC mode is deduced. Finally, the simulation results show that the proposed control strategy is effective and correct.

Research on Control Strategy of Microgrid Inverter Based on Virtual Synchronous Generator

2014 ◽  
Vol 529 ◽  
pp. 496-500 ◽  
Author(s):  
Xiang Chu Xu ◽  
Ling Zhu ◽  
Ben Feng Guo
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Synchronous Generator ◽  
Rotational Inertia ◽  
Simulink Simulation ◽  
Power Frequency ◽  
Output Characteristics ◽  
Frequency Controller ◽  
Virtual Synchronous Generator

In view of the conventional droop control method of inverter cannot fully meet the requirements of the microgrid operation,a new control strategy which is based on the traditional control method and combine with synchronous generator model is put forward, also known as VSG control strategy.AVSG model is establish, focusing on the design of the power frequency controller and excitation controller. The role of the rotational inertia and the power allocation problem of two VSGs in parallel networking system are verified through Matlab / Simulink simulation. The results show that, microgrid inverter based onVSG control strategy can simulate output characteristics of synchronous generator well and is conductive to microgrid operation

A frequency control strategy of electric vehicles in microgrid using virtual synchronous generator control

Energy ◽  
2019 ◽  
Vol 189 ◽  
pp. 116389 ◽  
Author(s):  
Pengfei Li ◽  
Weihao Hu ◽  
Xiao Xu ◽  
Qi Huang ◽  
Zhou Liu ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Control Strategy ◽  
Frequency Control ◽  
Synchronous Generator ◽  
Virtual Synchronous Generator

A Practical Secondary Frequency Control Strategy for Virtual Synchronous Generator

2020 ◽  
Vol 11 (3) ◽  
pp. 2734-2736
Author(s):  
Kun Jiang ◽  
Hongsheng Su ◽  
Hongjian Lin ◽  
Kaizhong He ◽  
Hanghang Zeng ◽  
...  
Keyword(s):  
Control Strategy ◽  
Frequency Control ◽  
Synchronous Generator ◽  
Virtual Synchronous Generator ◽  
Secondary Frequency Control
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