A Modified Droop Control Method for DC Microgrid with Improved Voltage Regulation and Current Sharing

2020 ◽  
Author(s):  
Ramu Dadi ◽  
K Meenakshy ◽  
Suresh K Damodaran
Keyword(s):  
Control Method ◽  
Voltage Regulation ◽  
Droop Control ◽  
Dc Microgrid ◽  
Current Sharing

scholarly journals The Hierarchical Control Algorithm for DC Microgrid Based on the Improved Droop Control of Fuzzy Logic

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2995 ◽  
Author(s):  
Liang Zhang ◽  
Kang Chen ◽  
Shengbin Chi ◽  
Ling Lyu ◽  
Guowei Cai
Keyword(s):  
Fuzzy Logic ◽  
Control Algorithm ◽  
Voltage Drop ◽  
Hierarchical Control ◽  
Voltage Regulation ◽  
Droop Control ◽  
Dc Microgrid ◽  
Current Sharing ◽  
The Difference ◽  
Bus Voltage

In the direct current (DC) microgrid composed of multiple distributed generations, due to the different distances between various converters and the DC bus in the system, the difference of the line resistance will reduce the current sharing accuracy of the system. The droop control was widely used in the operation control of the DC microgrid. It was necessary to select a large droop coefficient to improve the current sharing accuracy, but a too large droop coefficient will lead to a serious bus voltage drop and affect the power quality. In view of the contradiction between the voltage regulation and load current sharing in the traditional droop control, a hierarchical control algorithm based on the improved droop control of the fuzzy logic was proposed in this paper. By improving the droop curve, the problems of voltage regulation and current sharing were solved simultaneously. The effectiveness of the algorithm was verified by simulation.

scholarly journals Multiagent Based Distributed Control with Time-Oriented SoC Balancing Method for DC Microgrid

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2793 ◽  
Author(s):  
Tao Wu ◽  
Yanghong Xia ◽  
Liang Wang ◽  
Wei Wei
Keyword(s):  
Multiagent System ◽  
Control Method ◽  
Voltage Regulation ◽  
Control Voltage ◽  
Droop Control ◽  
Secondary Control ◽  
Dc Microgrid ◽  
Global Dynamic ◽  
Charging Mode ◽  
Balance Charge

Based on the droop control, voltage regulation at the secondary control is required to eliminate the deviation of the average voltage across the microgrid. Meanwhile, to prevent any of energy storage (ESs) from over-charging or over-discharging, State-of-Charge (SoC) balancing should be added in the secondary control. This paper proposes a distributed secondary control in the DC microgrid based on the multiagent system (MAS). This controller consists of voltage regulation and time-oriented SoC balancing. In voltage regulation, a PI controller adjusts the droop parameters according to the discrepancy between the average voltage and the reference voltage. In SoC balancing, controller operates in charging mode or discharging mode according to changes of the global average SoC. Being different from the conventional method, the time-oriented SoC balancing method is designed to balance charge/discharge time rather than to balance SoC directly. Thus, SoCs reach a consensus only at the last moment when all ES nodes charge or discharge completely. Furthermore, characteristics, global dynamic model, and steady-state analysis of the proposed control method are studied. Finally, MATLAB/Simulink simulations are performed to verify the effectiveness of the proposed control.

Improved droop control method with precise current sharing and voltage regulation

2016 ◽  
Vol 9 (4) ◽  
pp. 789-800 ◽  
Author(s):  
Hsuang‐Chang Chiang ◽  
Kuo‐Kuang Jen ◽  
Gwo‐Huei You
Keyword(s):  
Control Method ◽  
Voltage Regulation ◽  
Droop Control ◽  
Current Sharing

scholarly journals Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5356
Author(s):  
Prudhvi Kumar Gorijeevaram Reddy ◽  
Sattianadan Dasarathan ◽  
Vijayakumar Krishnasamy
Keyword(s):  
Power Flow ◽  
Control Method ◽  
Low Voltage ◽  
Experimental Studies ◽  
Load Sharing ◽  
Voltage Regulation ◽  
Primary Objective ◽  
Control Technique ◽  
Droop Control ◽  
Dc Microgrid

In a DC microgrid, droop control is the most common and widely used strategy for managing the power flow from sources to loads. Conventional droop control has some limitations such as poor voltage regulation and improper load sharing between converters during unequal source voltages, different cable resistances, and load variations. This paper addressed the limitations of conventional droop control by proposing a simple adaptive droop control technique. The proposed adaptive droop control method was designed based on mathematical calculations, adjusting the droop parameters accordingly. The primary objective of the proposed adaptive droop controller was to improve the performance of the low-voltage DC microgrid by maintaining proper load sharing, reduced circulating current, and better voltage regulation. The effectiveness of the proposed methodology was verified by conducting simulation and experimental studies.

scholarly journals Capacity Limitation Control of Multiple Bi-directional DC-DC Converters for Micro Grid Application

2015 ◽  
Vol 2 (1) ◽  
pp. 61 ◽  
Author(s):  
S. J. Chiang ◽  
Yu-Min Liao ◽  
Ke-Chih Liu
Keyword(s):  
Power Management ◽  
Control Method ◽  
Droop Control ◽  
Control Methods ◽  
Power Capacity ◽  
Capacity Limitation ◽  
Current Sharing ◽  
Parallel Control ◽  
Micro Grid ◽  
Bus Voltage

The micro grid system requires battery for energy storage and power management. In which, the bi-directional DC to DC converter is the key component for maintaining the DC bus voltage and controlling the charge and discharge of the battery with or without grid support. Parallel control of multiple DC to DC converters is a critical technique to enlarge the power capacity. This paper presents two capacity limitation control methods that multiple DC to DC converters can be paralleled with distributed battery banks. The first method is the capacity limitation control with cascaded load current sense needing no control interconnection. The second method is the capacity limitation control with master-slave and cascaded current command limitation. Two methods are presented to solve the limitation of droop control method and active current sharing method respectively, and can be extended without converter number limitation theoretically. Three prototype 240W bidirectional half-bridge DC to DC converters are built and paralleled in this paper. The proposed method is confirmed with some measured results.

Sign in / Sign up

Export Citation Format

Share Document