Control of Distributed Uninterruptible Power Supply Systems

By Josep M. Guerrero, Lijun Hang, Javier Uceda. IEEE transactions on industrial electronics (1982. Print), 2008

737 citations recorded by the source corpus.

In the last years, the use of distributed uninterruptible power supply (UPS) systems has been growing into the market, becoming an alternative to large conventional UPS systems. In addition, with the increasing interest in renewable energy integration and distributed generation, distributed UPS systems can be a suitable solution for storage energy in micro grids. This paper depicts the most important control schemes for the parallel operation of UPS systems. Active load-sharing techniques and droop control approaches are described. The recent improvements and variants of these control techniques are presented.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/7c926824e6099512b5898dc2f5a83fd400be511f

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Citations in the corpus

A Multiagent-Based Consensus Algorithm for Distributed Coordinated Control of Distributed Generators in the Energy Internet (2015, background): “in [10] and [11], which demonstrate that proper communication systems are necessary to realize the control goals.”
Power Flow Stabilization and Control of Microgrid with Wind Generation by Superconducting Magnetic Energy Storage (2011, background): “ble operation to balance any instantaneous mismatch in active power, efficient DES must be used [5]–[7].”
Hierarchical Structure of Microgrids Control System (2012, methodology): “However, it offers precise current sharing and high power quality [31].”
Coordinated Optimal Design of Inverter Controllers in a Micro-Grid With Multiple Distributed Generation Units (2013, background): “The control schemes for islanded operation can be classified into two main groups with regard to the use of intercommunication wires [3], [6]–[8].”
Control Strategies for Microgrids With Distributed Energy Storage Systems: An Overview (2018, background): “strategy can be used, but generally this is only practical for closely located sources, due to the high bandwidth control loops required [44].”
Transient Angle Stability of Virtual Synchronous Generators Using Lyapunov’s Direct Method (2019, background): “Moreover, the limited inertia provided by the power filter can also prevent frequency and voltage from abrupt change, especially in the islanded mode [5].”
A Flexible Harmonic Control Approach Through Voltage-Controlled DG–Grid Interfacing Converters (2012, methodology): “However, for microgrid applications, particularly considering the possible autonomous islanding operation, the DG units are desired to operate with VCM as it can provide direct voltage and frequency support for the loads [20]–[22].”
Control Techniques in AC, DC, and Hybrid AC–DC Microgrid: A Review (2018, methodology): “5) Virtual Impedance Method: The virtual impedance approach is used in [13], [16], [33], and [44], which considers a virtual impedance in the feedback path of the voltage control loop as shown in Fig.”
Trends in Microgrid Control (2014, methodology): “2) Non-Droop-Based Methods: The following control methods address primary control in a multi-DER microgrid from a centralized perspective: • A centralized controller is proposed in [93], [96], where the total load current is measured and transmitted to a central controller.”
A Generalized Droop Control for Grid-Supporting Inverter Based on Comparison Between Traditional Droop Control and Virtual Synchronous Generator Control (2019, background): “In a microgrid where communication lines are not suitable for information exchanges due to the distributed physical locations or to the noises along the lines, a better choice for the coordinative control of parallel inverters is usually the frequency- and voltage-droop control method, which is base”
Control Strategy for Flexible Microgrid Based on Parallel Line-Interactive UPS Systems (2009, background): “The DG concept is growing in importance, pointing out that the future utility line will be formed by distributed energy resources and small grids (minigrids or microgrids) interconnected between them [23], [24].”
Robust Droop Controller for Accurate Proportional Load Sharing Among Inverters Operated in Parallel (2013, background): “It is worth noting that another important trend to solve the problems associated with the parallel operation of inverters (e.g., sharing accuracy, voltage/frequency deviation, harmonics etc.) is to make the output impedance as accurate as possible over a wide range of frequencies (see [29], [30]…”
Autonomous Control of Interlinking Converter With Energy Storage in Hybrid AC–DC Microgrid (2013, background): “Other efforts include [15] where different load placements were considered and [16] where different control methods were discussed for multiple converters.”
Model Predictive Control with constant switching frequency using a Discrete Space Vector Modulation with virtual state vectors (2009, neutral): “Linear controllers and non linear controllers including adaptive control, repetitive control, fuzzy control and predictive control have been widely used in different applications as rectifiers, inverters, active power filters, uninterruptible power supplies and motors control [1]–[4].”