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Control of power electronic generations is important in microgrids and power systems. Droop control is proposed for reasonable power allocation among different inverters. Moreover, virtual synchronous generator is proposed to improve frequency dynamics in transient state. Therefore, inertia design in VSG is necessary for integrating power electronic generations into grids. Frequency dynamic and stability...
The converter valve is the critical link of AC and DC system and the most commonly used switching devices for converter valve are thyristors. The performance of thyristors could significantly affect the performance of converter valve while the transient characteristics and second order effects of thyristor are critical to determine the reliability of converter valve in HVDC (High Voltage Direct Current)...
Parallel-connected IGBTs are prone to large-current destruction in high-power applications due to current unbalance between each IGBT branches. This paper proposes a novel control method to improve the current balance in order to protect the device against over current destruction. The method uses two control loops to confine the current rising speed as well as to reconcile the current change start...
This paper focuses on the optimal design of Moving Average Filter (MAF). The necessary and sufficient condition for MAF to filter out a group of harmonics with specified orders simultaneously is deduced based on the presented model. Accordingly, the enhanced MAF (EMAF) algorithm is proposed and used for the fast open-loop phase locking of the distorted grid. Compared with the Cascaded Delayed Signal...
The characteristic parameters of the micro-grids determine its transient response and the stability. The generation, the grid structure and the electric loads of all the whole micro-grids are always changing randomly due to the random load changes and the integration of large-scale batch energy, indicating that the characteristic parameters of the micro-grids also changes. A novel real-time and on-line...
The characteristic parameters of micro-grid determine its transient response and stability. Due to uncertain load changes as well as large-scale intermittent energy accesses, the micro-grid systems are always subjected to large number of random disturbances which results in micro-grid structure parameters change. To solve this problem, this paper presents a novel model for characteristic parameters...
The frequency and voltage droop control is one important method which can deal with power sharing problem and realize “plug and play” function in microgrid. But it is subject to the power coupling and steady-state reactive power sharing error when employed in low voltage microgrids. Furthermore, complex microgrid configurations often make the power sharing more challenging. In this paper, an accurate...
This paper presents a digital complicated control method for an active voltage quality regulator (AVQR). The scheme combines repetitive and multi-loop control, utilizing repetitive control to guarantee good steady-state performances and dual-closed-loop as well as feed-forward control to improve dynamic response. Hence, it can achieve precise control for the output voltage waveform and fast dynamic...
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