scholarly journals Adaptive damping control strategy of virtual synchronous generator based on fuzzy control

2021 ◽  
Vol 2121 (1) ◽  
pp. 012038
Author(s):  
Wenkai Li ◽  
Jie Xie ◽  
Mengzhao Zhang ◽  
Chunlin Guo
Keyword(s):  
Fuzzy Control ◽  
Control Method ◽  
Fuzzy Controller ◽  
Storage System ◽  
Synchronous Generator ◽  
Response Speed ◽  
Energy Storage System ◽  
Damping Coefficient ◽  
Primary Frequency ◽  
Virtual Synchronous Generator

Abstract Based on the topology and small signal model of virtual synchronous generator, the influence of virtual inertia and damping coefficient on transient process is analysed. In order to solve the problem of overshoot with small damping coefficient and slow response with large damping coefficient, a fuzzy control method is introduced, which can completely eliminate overshoot without affecting the response speed. Another fuzzy controller is designed to optimize the output of the virtual synchronous generator in the primary frequency modulation process according to the SOC of the energy storage system.

scholarly journals A United Control Strategy of Photovoltaic-Battery Energy Storage System Based on Voltage-Frequency Controlled VSG

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2047
Author(s):  
Xiangwu Yan ◽  
Chenguang Wang ◽  
Ziheng Wang ◽  
Hongbin Ma ◽  
Baixue Liang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Control Method ◽  
Storage System ◽  
Energy Storage System ◽  
Control Mode ◽  
Battery Energy Storage ◽  
Voltage Frequency ◽  
Battery Energy ◽  
Primary Frequency

At present, the installed capacity of photovoltaic-battery energy storage systems (PV-BESs) is rapidly increasing. In the traditional control method, the PV-BES needs to switch the control mode between off-grid and grid-connected states. Thus, the traditional control mode reduces the reliability of the system. In addition, if the system is accidentally disconnected from the grid or the energy storage battery fails to work normally, the DC voltage of the inverter increases or decreases rapidly. To address these two problems, in this paper, a united control strategy is proposed. In the case of grid connection, based on the voltage-frequency controlled VSG strategy, the strategy adjusts the output power of the VSG by changing the position of the primary frequency modulation curve. This method can ensure that, after the system is connected to the grid, excess PV power can be sent to the grid, or power can be absorbed from the grid to charge energy storage. In the off-grid state, the strategy uses FPPT technology and superimposes a voltage component onto the voltage loop to quickly balance the DC power and AC power of the inverter. This strategy can improve the reliability of the system’s power supply if the energy storage fails to work normally. Finally, a PV-BES model was built using MATLAB-Simulink, and the simulation results proved the effectiveness of the proposed strategy.

Modeling and Sizing of Hybrid Energy Storage System for Virtual Synchronous Generator

2021 ◽  
Author(s):  
Surindi Vidusika Wijetunge ◽  
Sajana Gunasekera ◽  
Jeewantha Gamage ◽  
Chandima Dedduwa Pathirana ◽  
Sheron Bolonne
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Synchronous Generator ◽  
Energy Storage System ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Hybrid Energy Storage System ◽  
Virtual Synchronous Generator

Research on Bidirectional DC/DC Converter for Electric Vehicle

2014 ◽  
Vol 701-702 ◽  
pp. 1169-1172 ◽  
Author(s):  
Shuang Du ◽  
Rui Juan Guo ◽  
Li Chen Wang
Keyword(s):  
Electric Vehicle ◽  
Closed Loop ◽  
Control Method ◽  
Storage System ◽  
Response Speed ◽  
Energy Storage System ◽  
Fast Response ◽  
Control Mode ◽  
Working Principle ◽  
Ultra Capacitor

The voltages of between the battery and the ultra-capacitor are not equal in the energy storage system of the electric vehicle. DC/DC converter is researched in order to balance the voltages between the battery and the ultra-capacitor. The traditional control method is not ideal. The model of bidirectional DC/DC converter is established on the basis of the working principle of the DC/DC converter. And it is in the double closed loop PI control mode. The results of simulation indicate that the control method has fast response speed, small overshoot and strong ability of anti-interference. It can also balance the energy between the battery and the ultra-capacitor.

Micro-Grid Stability in Gapa Island Using Reactive Power Control of STATCOM (Case Study)

2014 ◽  
Vol 905 ◽  
pp. 411-415
Author(s):  
Do Heon Lee ◽  
Dong Wan Kim ◽  
Eel Hwan Kim
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Storage System ◽  
Synchronous Generator ◽  
Energy Storage System ◽  
Static Synchronous Compensator ◽  
Squirrel Cage ◽  
Micro Grid ◽  
Squirrel Cage Induction Generator ◽  
Battery Energy

This paper proposes a installation of a static synchronous compensator (Statcom) used battery energy storage system (BESS) for compensting the reactive power of the micro-grid in Gapa island. At present, the micro-grid in Gapa island has two squirrel cage induction generator (SCIG), and it consums a lot of the reactive power. To reduce the capacity of the Statcom, a SCIG is replaced by a permanent magnet synchronous generator (PMSG). The simulation will be carried out in two cases: (i) real system with two SCIGs; (ii) modified system with one SCIG, one PMSG and the Statcom. With the statcom, the reactive power is compensated and the grid voltage is stable. The simulation results will valuate the effectiveness of the proposed control method.

scholarly journals Coordinated LVRT Control for a Permanent Magnet Synchronous Generator Wind Turbine with Energy Storage System

2020 ◽  
Vol 10 (9) ◽  
pp. 3085 ◽  
Author(s):  
Chunghun Kim ◽  
Yonghao Gui ◽  
Haoran Zhao ◽  
Wonhee Kim
Keyword(s):  
Energy Storage ◽  
Permanent Magnet ◽  
Control Method ◽  
Storage System ◽  
Synchronous Generator ◽  
Energy Storage System ◽  
High Wind ◽  
Permanent Magnet Synchronous Generator ◽  
Wind Speeds ◽  
Additional Device

This study introduces a coordinated low-voltage ride through (LVRT) control method for permanent magnet synchronous generator (PMSG) wind turbines (WT) interconnected with an energy storage system (ESS). In the proposed method, both the WT pitch and power converters are controlled to enhance the LVRT response. Moreover, the ESS helps in regulating the dc link voltage during a grid fault. Previous LVRT methods can be categorized into strategies with or without an additional device for the LVRT. The latter scheme is advantageous from the perspective of no additional installation cost; in this case, pitch and converter controllers are used. Meanwhile, the former method uses an additional device for LVRT operation and hence, involves additional expense. However, it can effectively enhance the LVRT response by reducing the LVRT burden on the WT. Moreover, the additional device can be used for various WT power control applications and it is common that the ESS is interconnected to the WT for multiple objectives. Previous studies focused on these two aspects separately; hence, a method of coordinated control for an ESS and a WT is needed as more ESSs are required to connect to WTs for flexible wind power operation. The proposed method introduces a control method with different LVRT modes considering the ESS state of charge (SoC). When the WT does not have a sufficient inertial response operation range, the ESS reserve energy capacity is required for LVRT operation. This coordinated LVRT method employs both the WT and ESS controls when it is hard to handle the LVRT using the WT control alone at high wind speeds. In this case, power curve analysis is used to obtain the appropriate power reference during the fault period. In addition, a power reference is also used to ensure a safe operation. Using the proposed method, an ESS can be operated in a manner that is appropriate for WT operation, especially at high wind speeds. To validate the effectiveness of the proposed method, we considered two case studies. One study compares the LVRT response between the WT itself and the proposed method. The other research work compares the response of the conventional LVRT method that uses a WT and an ESS and with that of the proposed method. From these case studies, we concluded that the proposed method achieved a better performance while operating within the constraints of the WT rotor speed and ESS SoC limits.

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