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This paper proposes a current control strategy with zero steady-state tracking error for grid-connected boost-inverters. Two boost converters are controlled separately to achieve both output current tracking and balanced output voltages. Based on cascading control and feedback linearization, the inner and outer-loop controllers are derived combining the inversion of boost converter model and the output...
A Positive Feed-Forward (PFF) controller is proposed as a new active approach to improve stability of a three-phase DC/AC switching inverter. In particular, the proposed approach solves the source subsystem interaction problem, i.e., a system stability degradation which is commonly observed when the inverter is connected to a DC voltage source subsystem that presents finite Thévenin impedance. The...
The “communication mechanism” to realize the power share of grid-forming inverters is analyzed and a droop control method through active and reactive current is proposed in this paper. The control strategies of inverters connected in parallel forming a micro-grid are described in detail. The droop controller is divided into three units that are current (power) decoupling, the first-order inertia and...
The traditional control method for PV grid-connected inverter is two closed loop, if this control method is used for PV grid-connected system, the indication of slow response or increased troubles of system design which is caused by instability of switching frequency. This paper presents a three-loop control to overcome such problems, voltage external loop, current middle loop and frequency inner...
In this paper, a design of the control system for parallel distributed sources is proposed. These sources are connected together using inverters in an isolated low voltage microgrid. The inverters have been used to connect distributed power sources to microgrid with the capability of modification of the voltage amplitude and frequency. Also for the first time in IEEE publications, an automatic frequency...
Implementation of ancillary services in photovoltaic systems could facilitate their penetration in power systems. PV converters can be designed to improve grid power quality using power conditioning functionalities. This paper presents a single-phase photovoltaic system which provides grid voltage support at fundamental frequency. The proposed topology is controlled with the droop control technique...
The aim of the present paper is to describe appropriate control systems for local generators able to correctly manage a microgrid during its transition from a grid-connected to an islanded operation, as well as during its autonomous operation. In order to study the dynamic behaviour of a microgrid including renewable energy-based generation units, control systems for both synchronous generators and...
This paper discusses the integration of a static synchronous compensator (STATCOM) with a superconducting magnetic energy storage (SMES) system for controlling the frequency of large power systems (PS). At present, the new energy storage systems (ESS) are a feasible alternative to store excess energy for substituting the primary control reserve thus improving the primary frequency control (PFC). In...
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