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The increasing penetration of grid-connected RES systems, advanced control algorithms have been developed to operate under grid faults and fulfill strict requirements of the grid codes. In order to overcome this, the current controller performance is critical considering it as the inner control loop of any grid-connected RES system. Based on the resonant control concept, this paper presents a modified...
Inductive power transfer (IPT) converters are resonant converters that optimize energy efficiencies at some loads. To achieve maximum efficiency, it is common to cascade the IPT converter with front-side and load-side dc-dc converters. The two dc-dc converters are normally controlled cooperatively in order to meet the requirements of output regulation and maximum efficiency tracking using a control...
The combination of coupled inductors (CIs) and LCL filters can be a filter configuration to achieve high power density for high current applications. Frequency characteristics (i.e., resonance phenomenon) are changed according to the filter configuration and feedback currents (i.e., inverter-side or grid-side current) for current control loops. Therefore, stability analysis should be performed to...
The capacitive-coupling grid-connected inverter (CGCI) is able to achieve reactive power compensation and active power transfer simultaneously with a low operational voltage. The CGCI is coupled to the point of common coupling (PCC) via a second-order LC circuit, which makes its modeling and current control characteristics differs from the conventional inductive-coupling grid-connected inverter. The...
In this paper, the combinations of coupled inductors (CIs) and LCL filters are comparatively investigated for grid-connected interleaved three-phase voltage source inverters (VSIs) in terms of the resonance phenomenon. In current-controlled direct parallel VSIs, two current controllers are required for the power flow and the circulating currents. Therefore, the stability of both current controllers...
In order to maximize the profitability of big photovoltaic (PV) plants, high-power PV inverters of more than 500 kW are becoming attractive. The master–slave (MS) inverter is one of the most interesting architectures. Usually, it is composed of -paralleled three-phase inverters connected to the medium voltage grid through a transformer with secondaries on the low-voltage side. This type of transformer...
In this paper a new kind of identification method for differential self and mutual inductances of permanent magnet synchronous machines (PMSMs) is proposed.
This paper presents an analytical design method of indirect full digital controller with a simple structure for three-phase inverter system. Most of conventional researches on the analytical design of controller have been studied about the structure of continuous-time controller, and so the final implementation of full digital controller for industrial application was complicate and anyway based on...
This paper presents the optimized control of a three-phase grid connected inverter, considering as basis of analysis the observation of the dynamics of the system with two inputs and two outputs (TITO SYSTEM). This model allows the design of the inverter control in a direct way, by means of two PI controllers to control the instantaneous active and reactive power. By means of the control of the instantaneous...
A novel methodology for accurate and efficient static timing analysis is presented in this paper. The methodology is based on finding a frequency domain model for the gates which allows uniform treatment of the gates and interconnects. It is shown that despite the highly nonlinear overall gate model, a frequency domain model of the gate with the model parameters, gate moments, as functions of the...
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