Showing items 1 - 5 of 5

A new global index for short term voltage stability assessment

- Alshareef, Abdulrhman, Shah, Rakibuzzaman, Mithulananthan, Nadarajah, Alzahrani, Saeed

  • Authors: Alshareef, Abdulrhman , Shah, Rakibuzzaman , Mithulananthan, Nadarajah , Alzahrani, Saeed
  • Date: 2021
  • Type: Text , Journal article
  • Relation: IEEE Access Vol. 9, no. (2021), p. 36114-36124
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  • Description: The utility scale of non-conventional generators (NCGs), such as wind and photovoltaic (PV) plants, are competitive alternatives to synchronous machines (SMs) for power generation. Higher penetration of NCGs has been respondent of causing several recent incidents leading up to voltage collapse in power systems due to the distinct characteristics of NCGs under different operating conditions. Consequently, the so-called system strength has been reduced with higher NCGs penetration. A number of indices have been developed to quantify system strength from the short-term voltage stability (STVS) perspective. None of the indices capture the overall performances of power systems on dynamic voltage recovery. In this paper, an improvement in one of the STVS indices namely, the Voltage Recovery Index (VRI), is proposed to overcome shortcomings in the original index. Moreover, the improved index is globalized to establish a new index defined as system voltage recovery index (VRIsys) to quantify STVS at the system level. The amended VRI and developed VRIsys are used in systematic simulations to quantify the impact and interaction of various factors that could affect system strength. The assessment was conducted using time-domain simulation with direct connected induction motors (DCIMs) and a proliferation of converter-based technologies on both the generation and load sides, namely, NCGs and Variable Speed Drives (VSDs), respectively. © 2013 IEEE.

Dynamic VAr planning of large-scale PV enriched grid

- Alzahrani, Saeed, Mithulananthan, Nadarajah, Alshareef, Abdulrhman, Shah, Rakibuzzaman

  • Authors: Alzahrani, Saeed , Mithulananthan, Nadarajah , Alshareef, Abdulrhman , Shah, Rakibuzzaman
  • Date: 2021
  • Type: Text , Conference paper
  • Relation: 2021 IEEE PES Innovative Smart Grid Technologies - Asia, ISGT Asia 2021, Brisbane, 5-8 December 2021
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  • Description: The integration of more inverter-based renewable resources (IBRs) would make the grid susceptible to large disturbances. Short term voltage instability is one of the key concerns for the renewable rich power system. An additional dynamic VAr support would be desirable to enhance system recovery. STATCOM is technically and financially promising solution which can provide dynamic Var support to the renewable rich power system. In this paper, system transient performance is assessed after synchronous generators (SGs) being significantly replaced by IBRs. To avoid the delayed recovery, STATCOM was integrated at the point of common coupling (PCC). Considering the changes in the grid's effective VAr, a framework was proposed to size the STATCOM. Moreover, the influence of distributed STATCOM on system performance was also examined. The proposed framework has been tested in the New England 39 bus system through simulation by DIgSILENT Power Factory. © 2021 IEEE

Impact of Active Current Ramping of Large-Scale PV Plant on the Dynamic Voltage Stability

- Alshareef, Abdulrhman, Shah, Rakibuzzaman, Mithulananthan, Nadarajah

  • Authors: Alshareef, Abdulrhman , Shah, Rakibuzzaman , Mithulananthan, Nadarajah
  • Date: 2021
  • Type: Text , Conference paper
  • Relation: 2021 IEEE PES Innovative Smart Grid Technologies - Asia, ISGT Asia 2021, Brisbane, 5-8 December 2021
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  • Description: This paper investigates the impact of active current ramping rate (rrpwr) of Large-Scale photovoltaic (LSPV) plants on the short-term dynamic voltage stability. Thus, the rrpwr is adapted according to the fault distance from the LSPV plant Point of Integration (POI). The investigation shows that when a fault occurs closer to POI, lower rrpwr helps to achieve better voltage recovery. Lower rrpwr means slower active power recovery following active power curtailment activated by a grid fault. Therefore, lower rrpwr will not compromise the reactive power injection as needed. Based on the minimal improvement in the voltage recovery at POI, it can be concluded that the adaptive rrpwr is not an influential factor to improve the short-term dynamic voltage stability. © 2021 IEEE

Impact of PV plant and load models on system strength and voltage recovery of power systems

- Alshareef, Abdulrhman, Shah, Rakibuzzaman, Mithulananthan, Nadarajah

  • Authors: Alshareef, Abdulrhman , Shah, Rakibuzzaman , Mithulananthan, Nadarajah
  • Date: 2020
  • Type: Text , Conference proceedings
  • Relation: 2nd International Conference on Smart Power and Internet Energy Systems, SPIES 2020; Bangkok, Thailand; 15th-18th September 2020 p. 263-268
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  • Description: In recent years, non-conventional inverter-based sources, namely, wind, PV, and others have emerged as excellent alternatives to the traditional synchronous machine for power generation. It has also been reported that the so-called system strength may be reduced with high penetration of non-conventional generations (NCGs). A number of methods have been used to assess system strength which may not reflect the interdependency or reciprocal influence of various factors affecting it. This paper presents a thorough assessment to quantify the implications of and the interaction of various factors affecting system strength, with the voltage recovery index being used as a quantification tool. © 2020 IEEE.

Influence of induction motor in stability of power system with high penetration of large-scale PV

- Alshareef, Abdulrhman, Nadarajah, Mithulananthan, Shah, Rakibuzzaman

  • Authors: Alshareef, Abdulrhman , Nadarajah, Mithulananthan , Shah, Rakibuzzaman
  • Date: 2020
  • Type: Text , Conference proceedings
  • Relation: 2nd International Conference on Smart Power and Internet Energy Systems, SPIES 2020; Bangkok, Thailand; 15th-18th September 2020 p. 269-274
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  • Description: Inverter-Based Energy Resources (IBERs) have become an ordinary portion of the generation mix in power systems. Furthermore, converter-based technology has come to dominate modern motor loads on the consumption side. This transition in components towards accommodating power electronic devices alters the dynamic response of the power system. This paper investigates the impact of these elements on the dynamic stability of the power system. Firstly, this study successes to optimize a suitable model for converter-based motor loads. Secondly, indices of transient and voltage stabilities are used to quantify the strength of the power system at different circumstances incorporating the induction motor loads. Finally, this analysis provides an insight into the mutual interactions between transient and voltage stabilities. It is concluded that converter-based motor loads improve the voltage recovery when compared with direct-connected induction motors. However, the system is vulnerable to transient stability with the proliferation of inverter-based motor loads when IBERs dominant in the generation mix. © 2020 IEEE.
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