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Due to constantly increasing share of renewable energy sources in total installed power, transmission system operators must adhere to ever stricter grid codes in order to maintain stable, secure and reliable power system operation. Grid codes in most of the countries with significant share of wind power require from wind power plants to participate in active and reactive power control, to stay connected...
A unified controller for a voltage source inverter (VSI) is one of the most important technologies for a microgrid to switch smoothly between grid-connected mode and islanding mode. Generally, as the control objectives of grid-connected and islanding modes are different, the controller adopts different control algorithms for the two modes, which demands to monitor the operating status of the microgrid...
Grid-connected photovoltaic (PV) generation attracts increasing attention in countries around the world and it has been extensively studied during last ten years. In the literature, the control system for PV systems has been designed to respond extremely fast to changed weather condition, and the whole regulating duration is generally within tens of milliseconds. As PV installation is moving towards...
In order to reduce the cost of a wind power generation system, a new configuration using complementary half controlled converters for the PM synchronous generator is proposed. The unit power factor operation control and current coordinated control is applied to the two half controlled generator-side converters to reduce the harmonic current of the generator and improve its operation performance. The...
Operation of DC-DC switch-mode converters under discontinuous conduction mode has been analyzed by energy balancing method. The approach calculates the energy balance between the input and output power during each operating period. The results of analysis show that DC-DC converters give several distinctive input and output characteristics, under discontinuous conduction mode. For examples, a boost...
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