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Abstract
A grid-connetected control system is proposed in this paper to regulate three-phase bidirectional DC/AC converters in distribution grid exploiting photovoltaic power generation and not having energy storage at the DC side. To interact power flow at two its sides, statbilize voltage at the DCbus and synchronize with the grid, it includes an inner current controller and an outer voltage controller in a cascaded structure. Using small signal modeling and information about voltage at the point of common coupling and DCbus, control parameters for controllers are determined to balance power between photovoltaic system side and grid side. Simulation results show that the grid-connected control system helps the three-phase bidirectional DC/AC converter meet all requirements very well due to the balance of power at its sides to hold voltage at DC side at a fixed value, grid synchronization and low harmonic distortion total for current and voltage waveforms. They also represents the capability to exploit maximum available power of photovoltaic power generation under any operational condition.
Highlights
Basing on the development of semiconductor devices and advanced control technique, DC/DC and DC/AC power converters help photovoltaic power generation (PVg) become more popularly in distribution system
The power flow from PVg to the grid is controlled by combination IB-average voltage control (AVC) method to control a DC/DC boost converter and a grid-connected control system, this paper only proposes a method to regulate a three-phase bidirectional DC/AC converter in systems exploiting energy from PVg and not having energy storage linked to DCbus
Simulation results for characteristic of ppv (t), A (t) and power at maximum power point (MPP) (Pmpp (t)) are represented in Figure 12 when combining the IB-AVC method for the DC/DC converter and the grid-connected control system for the bidirectional DC/AC converter
Summary
Basing on the development of semiconductor devices and advanced control technique, DC/DC and DC/AC power converters help photovoltaic power generation (PVg) become more popularly in distribution system. To exploit energy from PVg and generate it to the grid or the utility, above power converters are often used in a cascaded structure with an intermediate element that was held at a fixed voltage value, called DCbus They need to be controlled by strategies to execute individual purposes [11], [15]. One of the best method that help to regulate PVg proposed recently is IB-AVC method, combining iterative and bisectional technique in maximum power point tracker (MPPT) and average voltage control (AVC) This method requires to use a pyranometer (PYR) to measure power of electromagnetic radiation (G) and a temperature sensor (TempS) to measure temperature (T) at p-n junctions. In the context of low cost for PYR and TempS, the IB-AVC method was considered as a potential approach to improve efficiency for whole system in the constrain of PV homogeneous cells [7]
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