Technical Presentations

Author(s): Ulas Karaagac
Type:Technical Presentation
Date: 2020-12-14

Safe Operation of DFIG based Wind Parks in Series Compensated Systems762

Abstract
<p>This presentation will demonstrate the impact of WP operating conditions and DFIG control system parameters on SSCI.</p><p>
Overview: - SSCI Phenomeno... see moren in Series compensated DFIG-based wind Parks - SSCI Problem Identification - Impact of DFIG control system parameters on SSCI - SSCI Mitigation - Future Research
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Author(s): Ulas Karaagac
Type:Technical Presentation
Date: 2020-12-14

Generic EMT type Model for Wind Parks763

Abstract
<p>This presentation managed by Ulas Karaagac from the Hong Kong Polytechnic University, show us a Generic EMT-type Model for Wind Parks with Permanent Magnet Synchronous Generator type ... see moreFull Size Converter Wind Turbines. Some presentation of the User Conference are available: https://www.emtp-software.com/support... Abstract : Utilities are under considerable pressure to increase the share of wind energy resources in their generation fleet. With the increasing share of wind energy resources, the dynamic behavior of power systems will change considerably due to fundamental differences in technologies used for wind and conventional generators. There is very little standardization in the ways to model wind turbines (WTs) and wind parks (WPs) in sharp contrast to conventional power plants. Hence, there is an international interest to deliver generic models (i.e. standardized and publicly available) for WTs and WPs that are able to capture all performance aspects as good as manufacturer-specific models. This research developed an electromagnetic transient (EMT) simulation model for full size converter (FSC) WT based WPs that can be used for stability analysis and interconnection studies. The considered topology uses permanent magnet synchronous generator. Although the collector grid and the FSC WTs are represented with their aggregated models, the overall control structure of the WP is preserved. FSC WT and WP control systems include the non-linearities, and necessary transient and protection functions to simulate the accurate transient behavior of WPs.</p>

Author(s): Ulas Karaagac
Type:Technical Presentation
Date: 2020-12-11

STATCOM Integration into a DFIG-based Wind Park and its impact on WP HVRT capability753

Abstract
<p>This presentation presents a research on static synchronous compensator (STATCOM) integration into a doubly-fed induction generator (DFIG) based wind park (WP) in order to fulfill the... see more grid code requirement for power factor control. The STATCOM impact on the WP high voltage ride-through (HVRT) capability is also analysed.</p><p>The WP HVRT capability is assessed by analyzing the responses to a parametric voltage waveform. The external system is represented by a Thevenin equivalent. The pre-described voltage waveforms are applied to the Thevenin source in order to assess the conformity of the HVRT capability to Hydro-Quebec specifications. An actual WP is considered where the simulation model includes all details regarding collector grid and overvoltage protection. The simulations consider various wind turbine (WT) and medium voltage (MV) feeder outage scenarios as well as STATCOM usage for reactive power compensation. A transient function is also proposed for the STATCOM to improve the WP HVRT capability. The simulation results demonstrate that, STATCOM usage provides a noticeable improvement in HVRT capability of the WP, especially with the proposed transient function.</p>

Author(s): Ulas Karaagac, Hong Kong Polytechnic University
Type:Technical Presentation
Date: 2020-11-20

Safe Operation of DFIG based Wind Parks in Series Compensated Systems740

Abstract
<h6 class="text-black" style="padding-bottom: 30px; padding-top: 30px; text-align: justify;">Speaker: <strong>Ulas Karaagac</stro... see moreng>, <em>Hong Kong Polytechnic University</em></h6> <p class="text-black">Subsynchronous control interaction (SSCI) is the interaction between the power electronics control and the series compensated transmission system that occurs at frequencies below the system nominal frequency. SSCI may occur between the doubly-fed induction generator (DFIG) control system and the series compensated transmission line, to which the wind park (WP) is connected. Not only the DFIG control system parameters, but also the WP operating conditions have significant impact on SSCI.<br><br>This presentation will demonstrate the impact of WP operating conditions and DFIG control system parameters on SSCI. Guidelines will be also presented for modifying the DFIG control system parameters to ensure safe operation and acceptable transient responses due to faults. In addition, the accuracies of various analytical tools used for SSCI problem identification will be discussed.</p>