Journal ArticleDOI
Distribution Voltage Control for DC Microgrids Using Fuzzy Control and Gain-Scheduling Technique
TLDR
In this paper, a low-voltage bipolar-type dc microgrid with two energy storage units and a dc/dc converter was proposed to achieve both power sharing and energy management.Abstract:
Installation of many distributed generations (DGs) could be detrimental to the power quality of utility grids. Microgrids facilitate effortless installation of DGs in conventional power systems. In recent years, dc microgrids have gained popularity because dc output sources such as photovoltaic systems, fuel cells, and batteries can be interconnected without ac/dc conversion, which contributes to total system efficiency. Moreover, high-quality power can be supplied continuously when voltage sags or blackouts occur in utility grids. We had already proposed a “low-voltage bipolar-type dc microgrid” and described its configuration, operation, and control scheme, through experiments. In the experiments, we used one energy storage unit with a dc/dc converter to maintain the dc-bus voltage under intentional islanding operation. However, dc microgrids should have two or more energy storage units for system redundancy. Therefore, we modified the system by adding another energy storage unit to our experimental system. Several kinds of droop controls have been proposed for parallel operations, some of which were applied for ac or dc microgrids. If a gain-scheduling control scheme is adopted to share the storage unit outputs, the storage energy would become unbalanced. This paper therefore presents a new voltage control that combines fuzzy control with gain-scheduling techniques to accomplish both power sharing and energy management. The experimental results show that the dc distribution voltages were within 340 V ± 5%, and the ratios of the stored energy were approximately equal, which implies that dc voltage regulation and stored energy balancing control can be realized simultaneously.read more
Citations
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Journal ArticleDOI
Adaptive Voltage Tuning Based Load Sharing in DC Microgrid
Shivam Chaturvedi,Deepak Fulwani +1 more
TL;DR: An ISMC based secondary controller is proposed, which tunes the voltage reference within the regulation range and also mitigates the bounded uncertainties in the communicated microgrid load data and a sliding mode control based primary control is proposed to regulate the voltage of a node and facilitate plug and play among the microgrid interfacing converters.
Journal ArticleDOI
Aeroengine Robust Gain-Scheduling Control Based on Performance Degradation
TL;DR: This study was conducted to develop a novel tracking control strategy for aeroengines with strong nonlinearity and uncertainty that has relatively low conservatism and can markedly improve engine performance.
Journal ArticleDOI
On Bidirectional DC Nano-Grids: Design Considerations and an Architecture Proposal
TL;DR: In this article, an analysis about the possible bidirectional capability of this DC nano-grid is presented, where the end-user can freely connect either a passive load (demanding power) or an active one (able to sink current to the grid).
Proceedings ArticleDOI
Improved droop control for effective load sharing and voltage regulation in DC microgrids
TL;DR: In this paper, the authors focus on DC voltage droop control to regulate the output voltage of converters and define a power management scheme to improve the quality and stability of the whole system by keeping the bus voltage within acceptable limits.
Proceedings ArticleDOI
ANFIS-Based Intelligent PI Controller for Secondary Frequency and Voltage Control of Microgrid
TL;DR: A novel intelligent and distributed secondary control scheme is proposed, which is based on PI controller, which adaptively and optimally adjust PI controller parameters the Adaptive Neuro-Fuzzy Interface System (ANFIS) technique, which adjusts PI controller coefficients according to microgrid operation conditions.
References
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Journal ArticleDOI
Hierarchical control of droop-controlled DC and AC microgrids — a general approach towards standardization
TL;DR: The hierarchical control derived from ISA-95 and electrical dispatching standards to endow smartness and flexibility to MGs is presented and results are provided to show the feasibility of the proposed approach.
Journal ArticleDOI
Progress in electrical energy storage system: A critical review
TL;DR: In this paper, a review of electrical energy storage technologies for stationary applications is presented, with particular attention paid to pumped hydroelectric storage, compressed air energy storage, battery, flow battery, fuel cell, solar fuel, superconducting magnetic energy storage and thermal energy storage.
Journal ArticleDOI
Adaptive Decentralized Droop Controller to Preserve Power Sharing Stability of Paralleled Inverters in Distributed Generation Microgrids
TL;DR: In this paper, an adaptive decentralized droop controller of paralleled inverter-based distributed generation (DG) units is presented to preserve the power sharing stability, which is based on the static droop characteristics combined with an adaptive transient droop function.
Journal ArticleDOI
Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution
TL;DR: In this paper, a low-voltage bipolar-type dc microgrid is proposed to supply super high quality power with three-wire dc distribution line. But, the proposed system is not suitable for large-scale systems.
Journal ArticleDOI
Fuzzy-Logic-Control Approach of a Modified Hill-Climbing Method for Maximum Power Point in Microgrid Standalone Photovoltaic System
TL;DR: In this article, a fuzzy-logic controller for maximum power point tracking of photovoltaic (PV) systems is proposed, which improves the hill-climbing search method by fuzzifying the rules of such techniques and eliminates their drawbacks.