Control of PWM rectifier under grid voltage dips

Abstract

Abstract. This paper investigates control structure for grid connected three-phase two-level Voltage Source Converter (VSC) under distorted grid voltage conditions. Grid voltage is distorted by balanced and unbalanced voltage dips and higher harmonics. To address the problem, the control structure of converter is presented. The control system is a modification of Voltage Oriented Control (VOC) based on Dual Vector Current Controllers (DVCC). Grid synchronization under distorted voltage is achieved by employing Phase Locked Loop (PLL). Simulation and experimental results, which illustrate properties of proposed system, are presented.

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“…With symmetrical sinusoidal voltage only positive sequence is present. During voltage dip one or more phase voltages drop or phase shift can appear, introducing negative sequence [30]. In the Synchronous Reference Frame (SRF) it appears as oscillation with doubled grid frequency.…”

Improved the ride-through capability of wind power plants using doubly-fed induction generator under unbalanced voltage conditions

“…Đồng thời, nghiên cứu này còn đưa ra phương pháp sử dụng hai bộ điều khiển dòng được thực hiện trên cả hai hệ trục tọa độ tương ứng với các thành phần thứ tự thuận và ngược và được gọi là bộ điều khiển vector dòng đối ngẫu. Phương pháp này cũng được đề cập đến trong nhiều tài liệu nghiên cứu khác, chẳng hạn như trong [10,16,18]. Các biện pháp khắc phục lỗi lưới không đối xứng sử dụng bộ biến đổi với 4 nhánh van trong hệ thống ba pha 4 dây cũng được đề cập trong các tài liệu [17,31].…”

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“…All these solutions, although more costly than the ones applied at the beginning of the development of wind power in Poland, are characterized by much better regulatory qualities, among which are: the capability of adjusting active and passive power; the capability of operating at varying shaft rotation speeds, rapid reaction to change of wind conditions (0.5-1 ms); avoiding influence and resistance to deteriorating quality of EE in an EEN; and the capability to work in islanding mode [10]. These aspects support the implementation of the vector control method applied originally to the motor drives [16][17][18][19], as well as the Maximum Power Point Tracking (MPPT) algorithms enabling the full use of the available wind energy [9,12]. Multipolar SM and PMSM permit through this the elimination of a mechanical transmission system, which raises the reliability of the turbine.…”