scholarly journals Autonomous control of inverter-interfaced Distributed Generation units for harmonic current filtering and resonance damping in an islanded microgrid

2012 ◽  
Author(s):  
Xiongfei Wang ◽  
Frede Blaabjerg ◽  
Zhe Chen
Keyword(s):  
Distributed Generation ◽  
Autonomous Control ◽  
Harmonic Current ◽  
Resonance Damping ◽  
Islanded Microgrid

Frequency and State-of-Charge Restoration Method in a Secondary Control of an Islanded Microgrid without Communication

2020 ◽  
Vol 10 (5) ◽  
pp. 1558
Author(s):  
Jin-Oh Lee ◽  
Yun-Su Kim
Keyword(s):  
Distributed Generation ◽  
Control Method ◽  
State Of Charge ◽  
Secondary Control ◽  
Communication Devices ◽  
State Frequency ◽  
Integral Controller ◽  
Islanded Microgrid ◽  
Restoration Method ◽  
System Frequency

This paper presents a control method for inverter-interfaced distributed generation (DG) and energy storage systems (ESSs) in an islanded microgrid. The proposed method is focused on secondary control, particularly frequency restoration and maintaining the ESSs’ state of charge (SOC). To recover frequency deviation due to load change, an ESS is used as a droop-controlled grid-forming source. However, the grid-forming ESS cannot manage its own SOC, since it cannot control its own output power; hence, grid-feeding DGs are used to maintain the SOC within a desired range. Management of the SOC, as well as frequency restoration, is conducted by using local controllers without any communication devices, since dependency on communication may deteriorate system reliability in the case of failure. The proposed method for maintaining SOC can be realized by adjusting the system frequency, which is the only value that can be measured locally with almost the same value at every node in a steady state. Frequency restoration can be achieved by a simple ON/OFF scheme of the integral controller with a hysteresis loop to solve problems caused by differences between frequency measurements or set points among DGs.

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