scholarly journals Damping Formation Mechanism and Damping Injection of Virtual Synchronous Generator Based on Generalized Hamiltonian Theory

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7082
Author(s):  
Yun Zeng ◽  
Jing Qian ◽  
Fengrong Yu ◽  
Hong Mei ◽  
Shige Yu
Keyword(s):  
Formation Mechanism ◽  
Hamiltonian Structure ◽  
Hamiltonian Dynamics ◽  
Synchronous Generator ◽  
Damping Factor ◽  
Damping Characteristics ◽  
Hamiltonian Model ◽  
Injection Control ◽  
The Stability ◽  
Virtual Synchronous Generator

Invertor as a virtual synchronous generator (VSG) to provide virtual inertia and damping can improve the stability of a microgrid, in which the damping is one of the fundamental problems in dynamics. From the view of the Hamiltonian dynamics, this paper researches the damping formation mechanism and damping injection control of VSG. First, based on the energy composition and dynamic characteristics of VSG, the differential equations system of VSG is established and is transformed into the generalized Hamiltonian system. Second, the effects of the three parameters of VSG, the damping coefficient D, active power droop coefficient, and time constant of excitation TE on damping characteristics are researched from a dynamic perspective, and simulation research is carried out with an isolated microgrid. Lastly, the control design method of Hamiltonian structure corrections used to add the damping factor and design the equivalent control inject damping to improve the stability of the isolated microgrid. Research shows that the voltage and frequency stability of the isolated microgrid can be effectively improved by selecting three key parameters of VSG and damping injection control. The innovations of this paper are 1. The Hamiltonian model of the inverter is deduced and established by taking the inverter as a virtual generator. 2. Based on the Hamiltonian model, damping characteristics of inverter in the microgrid are studied. 3. Hamiltonian structure correction method is applied to the inverter, and equivalent damping injection is designed to improve the stability of the microgrid.

scholarly journals FRT and Transient Stability Augmentation of Grid-Connected PV Station Using Virtual Synchronous Generator

2021 ◽  
Vol 20 (4) ◽  
pp. 118-126
Author(s):  
Md. Kamrul Islam ◽  
Mohammad Abdul Mannan ◽  
Md. Rifat Hazari
Keyword(s):  
Control System ◽  
Power System ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Synchronous Generator ◽  
Frequency Stability ◽  
Pv System ◽  
Damping Characteristics ◽  
Grid Codes ◽  
Virtual Synchronous Generator

Due to the extensive integration of renewable energy sources (RESs), i.e., photovoltaic (PV) system, the future power system is developing into an inverter-based system from a dominated alternator-based power system. This massive penetration of inverter-based PV system reduced the system inertia and damping characteristics of the power grid, impacting the fault ride-through (FRT) capability and causes frequency instability. Modern grid codes require that PV systems should work in the same way as conventional power plants and assist the system during transient state. However, most of the conventional inverter control mechanisms failed to fulfill the requirements of grid codes, especially when the penetration ratio of the PV system is close to the conventional unit. Therefore, this paper proposes a virtual synchronous generator (VSG) control mechanism of PV system inverter to augment FRT competency and frequency stability. The proposed VSG control system mimics the behavior of conventional power plants. To observe and evaluate the proposed controller behavior, simulation analyses were executed in the PSCAD/EMTDC software for both proposed and conventional controllers. The simulation results clearly indicate that the proposed VSG control system has sufficient damping characteristics to ensure FRT capability and frequency stability.       

scholarly journals Stability analysis of an isolated microgrid with the presence of the hybrid energy storage system-based virtual synchronous generator

2020 ◽  
pp. 46-51
Author(s):  
Van Tan Nguyen, Thanh Bac Le Nguyen
Keyword(s):  
Storage System ◽  
Synchronous Generator ◽  
Energy Storage System ◽  
Energy Sources ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Hybrid Energy Storage System ◽  
Simulation Results ◽  
The Stability ◽  
Virtual Synchronous Generator

Nowadays, isolated microgrids formed by distributed generators based on renewable energy sources and power electronic converters have become more and more popular. There has been a lot of research for improving the stability of microgrids in recent years particularly the virtual synchronous generator (VSG) is a topic of great interest. This paper presents the stability analysis of an isolated microgrid based on wind-photovoltaic-diesel hybrid energy sources with the introduction of a proposed VSG. The proposed VSG is based on a battery-supercapacitor (SC) hybrid energy storage system aiming to maintain the stability of the studied isolated microgrid under disturbance conditions. The time-domain simulation results of the studied system under various disturbance conditions are examined to evaluate the effectiveness of the proposed VSG. It can be concluded from the simulation results that the proposed VSG can effectively compensate power fluctuations and maintain the stability of the studied microgrid under various disturbance conditions. The simulation results also show that while the battery can handle the long-term power variations, the SC can absorb the rapid power fluctuations. Thus, the proposed VSG based on a combination of the battery and the SC could improve the battery’s lifetime and reduce the invested cost of the SC.

scholarly journals A weighted voltage model predictive control method for a virtual synchronous generator with enhanced parameter robustness

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Leilei Guo ◽  
Zhiye Xu ◽  
Nan Jin ◽  
Yanyan Li ◽  
Wei Wang
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Output Voltage ◽  
Control Method ◽  
Synchronous Generator ◽  
Experimental Tests ◽  
Tracking Accuracy ◽  
The Stability ◽  
Parameter Robustness ◽  
Virtual Synchronous Generator

AbstractTo address the problem of insufficient system inertia and improve the power quality of grid-connected inverters, and to enhance the stability of the power system, a method to control a virtual synchronous generator (VSG) output voltage based on model predictive control (MPC) is proposed. Parameters of the inductors, capacitors and other components of the VSG can vary as the temperature and current changes. Consequently the VSG output voltage and power control accuracy using the conventional MPC method may be reduced. In this paper, to improve the parameter robustness of the MPC method, a new weighted predictive capacitor voltage control method is proposed. Through detailed theoretical analysis, the principle of the proposed method to reduce the influence of parameter errors on voltage tracking accuracy is analyzed. Finally, the effectiveness and feasibility of the proposed method are verified by experimental tests using the Typhoon control hardware-in-the-loop experimental platform.

scholarly journals VSG-Based Parameter Adaptive Control Strategy

2021 ◽  
Vol 257 ◽  
pp. 02041
Author(s):  
Guo Jianyi ◽  
Fan Youping
Keyword(s):  
Adaptive Control ◽  
Dynamic Response ◽  
Control Strategy ◽  
Control Strategies ◽  
Synchronous Generator ◽  
Frequency Change ◽  
Control Effect ◽  
Damping Characteristics ◽  
Adaptive Control Strategy ◽  
Virtual Synchronous Generator

As a large number of converters composed of power electronic devices are connected to the grid, power system has gradually decreased stability. How to increase dynamic response of the converter has become one of the research hotspots. Virtual synchronous generator technology (VSG) can endow the converter with moment of inertia and damping characteristics, thereby enhancing dynamic response, but the traditional VSG technology cannot achieve the optimal control effect. To solve this problem, an adaptive control strategy is proposed, which takes logical combination of system angular velocity and frequency change as the real-time change condition, with exponential function as the change expression. Finally, this paper uses MATLAB / Simulink to compare the method in this paper with several existing typical control strategies.

scholarly journals A Self-Adaptive Damping Control Strategy of Virtual Synchronous Generator to Improve Frequency Stability

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 291 ◽  
Author(s):  
Tianyang Li ◽  
Buying Wen ◽  
Huaiyuan Wang
Keyword(s):  
Control Strategy ◽  
Synchronous Generator ◽  
Control Methods ◽  
Simulation Experiments ◽  
Damping Control ◽  
The Stability ◽  
System Frequency ◽  
The Relationship ◽  
Virtual Synchronous Generator ◽  
Self Adaptive

In a microgrid, grid-connected inverters, as the interface between the distributed power supply and grid, cannot provide inertia support for the system. The control strategy of virtual synchronous generator (VSG) based on grid-connected inverters can enhance the stability of system frequency. In order to make the frequency response that has a smaller overshoot and a shorter settling time, a self-adaptive damping control strategy based on the relationship between the damping and the maximum frequency deviation for microgrid VSG is presented. The small-signal mathematical model of VSG is established, and the range of the damping coefficient is determined. Finally, simulation experiments are carried out with MATLAB/Simulink, and the effectiveness of the proposed control strategy is verified by comparing it with various damping control methods.

Virtual Synchronous Generator Control for Single-Phase Three-Wire Systems

2017 ◽  
Vol 137 (6) ◽  
pp. 546-552 ◽  
Author(s):  
Yuko Hirase ◽  
Osamu Noro ◽  
Shogo Katsura ◽  
Kensho Abe ◽  
Eiji Yoshimura ◽  
...  
Keyword(s):  
Single Phase ◽  
Synchronous Generator ◽  
Virtual Synchronous Generator
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