Dynamic Modeling of Loads in Stability Studies

Kent, Maurice H.; Schmus, Wayne R.; McCrackin, Francis A.; Wheeler, Luther M.

doi:10.1109/tpas.1969.292387

Cited by 80 publications

(11 citation statements)

References 1 publication

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“…During the modelling of the SAPP power grid, the load will be represented as a bulk power delivery points that will be aggregated from the different loads at the transmission substation [47].…”

Section: Load Modellingmentioning

confidence: 99%

Dynamic analysis of Southern Africa power pool (SAPP) network

Mludi

Davidson

2017

2017 IEEE PES PowerAfrica

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Synchronous generators have been connected through overhead transmission lines and interconnected to a regional power system network to improve reliability, enhance the security of supply, trade electricity and share the available natural resources for energy fuel supply. The interconnected power system experiences disturbances during normal operation such as load variations and faults, causes stress on the generators to control and remain in synchronism. This dissertation analyses the natural damping oscillations that will emanate during a disturbance in the interconnected power system and provide understanding to the system operator to monitor and operate effectively the Southern African Power Pool (SAPP). It is required to carry out the performance analysis and characteristics of the generators during the disturbances in order to identify the synchronizing and damping torque in respect of rotor angle and speed deviations. In power system control, the frequency is monitored continually since the speed of the generators is synchronized into the transmission lines. Any small variation on the interconnected system will affect the others machines. The effect can either be the system maintaining its stability or loss of synchronism. The latter can be avoided by identifying the nature and behaviour of oscillations and determining effective means to minimize them in interconnected power pool. It can also notify the system operator of an impending power outage. In this research investigation, a simplified model of the Southern African Power Pool is modeled using DIgSILENT Powerfactory power systems analysis software tool, using input data of the primary plant (synchronous generators) and associated interconnected power system network. Nodal and modal analysis tools were used to determine the dynamic status of the interconnected power network. A dynamic analysis will enable participating members of the power pool understand the nature of oscillations when affected by different types of events with continuous monitoring of the modes and eventually assist in re-tuning of secondary control equipment to improve the service delivery of electricity of a pool such as of the Southern African region.The study has identified the focal points of power oscillations in the modelled SAPP grid through simulations that affects the behaviour of system voltages during a disturbance and require to control damping oscillations on the synchronous generators.

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Section: Load Modellingmentioning

confidence: 99%

Dynamic analysis of Southern Africa power pool (SAPP) network

Mludi

Davidson

2017

2017 IEEE PES PowerAfrica

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“…Therefore, the effects of the voltage drop in accordance with the supply capacity of the reactive power of the industrial plant during a motor startup need to be examined [15][16][17][18].…”

Section: Device Dynamic Characteristic Analysis Of Induction Motormentioning

confidence: 99%

A Study on the Tolerance Band of Voltage Drop during Motor Startup for Refineries and Chemical Plants with Isolated Power Systems

Shin¹,

Cho²,

Chun³

et al. 2017

Journal of Electrical Engineering and Technology

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-Refineries and chemical plants with isolated power systems that have a limited power supply are more susceptible to voltage changes from disturbances compared to power systems connected with a power company. Furthermore, most loads in such cases are induction motor loads, and therefore, transient voltage characteristics when starting a high-capacity motor must be examined. In general, high-capacity motors are customized appropriately to the load performance curve by the manufacturer during the construction of an industrial plant. Subsequently, when complying with the voltage drop permitted by international standards during the design process, power supply equipment such as transformers and generators is overdesigned. Therefore, a novel analysis is necessary on standards for startup and constraint voltage drops, as well as on identifying the voltage drop limitations for starting high-capacity motors in refineries and chemical plants with isolated power systems. In this study, field tests on an industrial plant were conducted,, and simulations modeled under conditions identical to those of the field test system were performed using the general-purpose program ETAP in order to compare the results.

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“…It is essential to develop accurate dynamic load models for transient stability analysis and operation of power systems [1,2]. Nonetheless, the modeling has long been a challenging task due to the inherent uncertainty, complexity, and diversity of power system loads [3].…”

Section: Introductionmentioning

confidence: 99%

Parameter Sensitivity and Dependency Analysis for the WECC Dynamic Composite Load Model

Zhang

Guo

Zhu

2017

Proceedings of the 50th Hawaii International Conference on System Sciences (2017)

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An accurate dynamic load model plays a crucial role in the analysis of power system transient stability. The WECC dynamic composite load model (CMPLDW) has been developed recently to better represent faultinduced delayed-voltage-recovery (FIDVR) events, which are of increasing concern to electric utilities. To facilitate the understanding of the CMPLDW, it is worth studying the effect of parameters that describe the model structure on its dynamic response. In this paper, we show that 1) some parameters have very minimal sensitivities under certain FIDVR events; 2) sensitivities of certain parameters are strongly dependent on the temporal profile of given fault, such as its minimum fault voltage or recovery time; and 3) some parameters share similar sensitivity patterns and thus the change of their values may complement each other. These observations are essential for further developing enhanced measurement-based dynamic load modeling approaches by tackling the parameter identifiability issues pointed out in the present work.

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Dynamic Modeling of Loads in Stability Studies

Cited by 80 publications

References 1 publication

Dynamic analysis of Southern Africa power pool (SAPP) network

Dynamic analysis of Southern Africa power pool (SAPP) network

A Study on the Tolerance Band of Voltage Drop during Motor Startup for Refineries and Chemical Plants with Isolated Power Systems

Parameter Sensitivity and Dependency Analysis for the WECC Dynamic Composite Load Model

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