scholarly journals Secondary control for voltage unbalance compensation in an islanded microgrid

2011 ◽  
Author(s):  
Mehdi Savaghebi ◽  
Josep M. Guerrero ◽  
Alireza Jalilian ◽  
Juan C. Vasquez
Keyword(s):  
Secondary Control ◽  
Voltage Unbalance ◽  
Islanded Microgrid

Distributed Cooperative Secondary Control for Voltage Unbalance Compensation in an Islanded Microgrid

2015 ◽  
Vol 11 (5) ◽  
pp. 1078-1088 ◽  
Author(s):  
Fanghong Guo ◽  
Changyun Wen ◽  
Jianfeng Mao ◽  
Jiawei Chen ◽  
Yong-Duan Song
Keyword(s):  
Secondary Control ◽  
Voltage Unbalance ◽  
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.

scholarly journals An Improved Centralized Control Structure for Compensation of Voltage Distortions in Inverter-Based Microgrids

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1862 ◽  
Author(s):  
Morteza Afrasiabi ◽  
Esmaeel Rokrok
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Hierarchical Control ◽  
Control Level ◽  
Measurement Unit ◽  
Centralized Control ◽  
Secondary Control ◽  
Voltage Unbalance ◽  
Control Scheme ◽  
Centralized Controller

Recently, increased use of non-linear loads has intensified the harmonic distortion and voltage unbalance in distribution systems. Inverter Based Distributed Generators (IBDGs) can be employed as distributed compensators to improve the power quality, as well as to supply distribution systems. In this paper, an enhanced hierarchical control scheme for the compensation of voltage disturbance in an AC Micro Grid (MG) that includes of two control levels is proposed. The secondary control level is performed by a centralized controller. Data of voltage harmonics and voltage unbalance at the MG Sensitive Load Bus (SLB) is sent to the centralized controller by a measurement unit. A general case with a combined voltage harmonic and unbalance distortion is considered. The compensation coefficients for IBDG units are computed by the centralized controller, and reference commands are sent to the local controllers of the IBDG units that act as a primary level of control. In the secondary control level, harmonic analysis is performed for the MG in order to provide a guide for properly assigning the harmonics and unbalance compensation priorities to IBDGs at different locations in the distribution system. Some buses have more participation in exciting the MG resonance modes; therefore, larger harmonic compensation factors are considered for the IBDGs that are near to these buses. For other IBDGs, the voltage unbalance compensation factor is selected bigger. The control system of the IBDGs mainly includes a current controller, a virtual damping resistor loop, and a load compensation block. Effectiveness of the proposed control scheme is demonstrated through simulation studies.

scholarly journals Enhanced PI control and adaptive gain tuning schemes for distributed secondary control of an islanded microgrid

2021 ◽  
Author(s):  
Yuanshi Zhang ◽  
Amin Mohammadpour Shotorbani ◽  
Liwei Wang ◽  
Behnam Mohammadi‐Ivatloo
Keyword(s):  
Pi Control ◽  
Secondary Control ◽  
Islanded Microgrid
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