مشخصات مقاله | |
ترجمه عنوان مقاله | گذار از ولتاژ پایین نامتقارن طرح و تنظیم ولتاژ پر توان در واحدهای توزیع شده تولید |
عنوان انگلیسی مقاله | Asymmetric Low-Voltage Ride-Through Scheme and Dynamic Voltage Regulation in Distributed Generation Units |
انتشار | مقاله سال ۲۰۱۸ |
تعداد صفحات مقاله انگلیسی | ۶ صفحه |
هزینه | دانلود مقاله انگلیسی رایگان میباشد. |
پایگاه داده | نشریه IEEE |
مقاله بیس | این مقاله بیس میباشد |
نمایه (index) | scopus |
نوع مقاله | ISI |
فرمت مقاله انگلیسی | |
رشته های مرتبط | مهندسی برق |
گرایش های مرتبط | مهندسی الکترونیک، سیستم های قدرت |
نوع ارائه مقاله |
کنفرانس |
مجله / کنفرانس | کنفرانس و نمایشگاه الکترونیک برق کاربردی – Applied Power Electronics Conference and Exposition |
دانشگاه | Masoud M. Shabestary – University of Alberta – Edmonton – Canada |
کلمات کلیدی | سوق دادن خطا، کدهای شبکه، مبدلهای متصل به شبکه، کنترل توالی مثبت و منفی، خطاهای نامتعادل، تنظیم ولتاژ |
کلمات کلیدی انگلیسی | Fault ride through, grid codes, gridconnected converters, positive and negative sequence control, unbalanced faults, voltage regulation |
شناسه دیجیتال – doi |
https://doi.org/10.1109/APEC.2018.8341231 |
کد محصول | E10467 |
وضعیت ترجمه مقاله | ترجمه آماده این مقاله موجود نمیباشد. میتوانید از طریق دکمه پایین سفارش دهید. |
دانلود رایگان مقاله | دانلود رایگان مقاله انگلیسی |
سفارش ترجمه این مقاله | سفارش ترجمه این مقاله |
فهرست مطالب مقاله: |
Abstract I Introduction II Proposed Asymmetrical Low-Voltage Ride-Through (ALVRT) Scheme III Proposed Dynamic Voltage Regulation (DVR) Strategy IV Simulation Resulte V Conclusion REFERENCES |
بخشی از متن مقاله: |
Abstract
Most grid codes mainly focus on the low-voltage ride-through (LVRT) requirements under balanced grid faults, and simply provide the LVRT curves which only apply for the positive-sequence voltage value. Under shortterm asymmetric faults, this brings some shortcomings: i) disconnecting the large units under temporary unbalanced faults worsens the situation most of the time, and may cause cascaded outages; ii) a reconnection process is required after the fault is cleared; iii) it is not an economical option, and the power may be wasted. Therefore, a new regulation scheme, called asymmetric low-voltage ride-through (ALVRT), is proposed in this paper. The ALVRT scheme is intended to provide the allowable margins for each phase voltage magnitude rather than for just positive-sequence voltage. This aids the large converter-interfaced distributed generation units not only ride through the asymmetrical grid faults, but also support the grid with a seamless transition over the fault and enhance the power system reliability. A new voltage regulation method is also proposed to address the ALVRT specifications. The successful results of the proposed regulation scheme and voltage support method are verified using simulation test cases. INTRODUCTION Increasing growth is expected for exploiting renewable and green energy resources in coming years. This will shift the electrical network paradigm toward increasing integration of distributed generation (DG) units [1], [2]. Grid-connected converters (GCCs) have been identified to be critical components for DGs thriving integration. Robust and reliable operation of high power GCCs, under various abnormalities, has thus become a substantial challenge for system operator and reinforced existing concerns regarding their influences on the grid stability [3]-[7]. The combination of growing DG sources with large applications of modern loads causes more vulnerability to voltage sags, swells, and unbalanced conditions [8]. In this sense, the distant grid faults can significantly harm the operation of GCCs. However, GCCs can be smartly controlled for riding through the short-term faults and delivering ancillary services to improve the grid stability and reliability [9]. Recent grid codes from different countries [10]-[16] render certain voltage magnitude curves above which the GCC should withstand the short-term symmetrical faults. This is well known as low-voltage ride-through (LVRT) requirements. In order to address the stability concerns, the performance of DG systems must be improved to meet the LVRT requirements in each country. Numerous efforts have thus been carried out to fulfill these requirements and improve the LVRT capabilities of distributed generation units [17]-[29]. Some countries (such as Germany, England and Ireland [13]-[15]) mandate reactive current injection (RCI) requirements by wind power plants during the grid faults. The RCI aims to support and rapidly restore the system voltage, in much the same way as a conventional synchronous generators increases its excitation during faults via automatic voltage regulator action [11]. German grid code, E.ON [13], forces wind farms to support grid voltage with additional reactive current during a voltage dip, amounting to at least 2% of the rated current for each percent of the voltage dip. The characteristic refers to the voltage at the grid connection point, and only applies when the fault is a symmetrical voltage dip. The grid codes in Britain [14] and Ireland [15] denote that wind power plants must deliver their maximum reactive current during a symmetrical voltage dip. Also, the wind power plants are required to be able to inject reactive power within 150 ms (7.5 cycles) of grid recovery, according to the Spanish grid code [16]. However, most of the codes, to date, have not considered specific RCI requirements in the case of unbalanced network fault, whereas its probability in transmission systems are much higher compared to the balanced fault. |