Effect of sudden change load on isolated electrical grid

Mirošević, Marija; Maljković, Zlatko

doi:10.1109/esars.2015.7101465

Cited by 5 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another overly simplistic approach consists of interrupting all of the timers simultaneously when any frequency deviation occurs. This triggers a step change in demand that ignores the frequency's evolution and can cause system instabilities [23] if the share of DERs in the power system is significant. Therefore, it is necessary to prioritize devices so that the ones with higher timer or temperature turn OFF first in underfrequency events.…”

Section: Decentralized Frequency Control For Pemmentioning

confidence: 99%

Decentralized Frequency Control using Packet-based Energy Coordination

Mavalizadeh

Espinosa

Almassalkhi

2020

2020 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm)

View full text Add to dashboard Cite

This paper presents a novel frequency-responsive control scheme for demand-side resources, such as electric water heaters. A frequency-dependent control law is designed to provide damping from distributed energy resources (DERs) in a fully decentralized fashion. This local control policy represents a frequency-dependent threshold for each DER that ensures that the aggregate response provides damping during frequency deviations. The proposed decentralized policy is based on an adaptation of a packet-based DER coordination scheme where each device send requests for energy access (also called an "energy packet") to an aggregator. The number of previously accepted active packets can then be used a-priori to form an online estimate of the aggregate damping capability of the DER fleet in a dynamic power system. A simple two-area power system is used to illustrate and validate performance of the decentralized control policy and the accuracy of the online damping estimating for a fleet of 400,000 DERs.

show abstract

Section: Decentralized Frequency Control For Pemmentioning

confidence: 99%

Decentralized Frequency Control using Packet-based Energy Coordination

Mavalizadeh

Espinosa

Almassalkhi

2020

2020 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm)

View full text Add to dashboard Cite

show abstract

“…They are also used in diesel generators for hospitals, islands, electrical ships, etc. [1][2][3][4]. A good dynamic performance of the voltage regulation is required during small and large disturbances as full load rejection.…”

Section: Introductionmentioning

confidence: 99%

Controlled Brushless De-Excitation Structure for Synchronous Generators

Chouaba¹,

Barakat²

2019

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

The main weakness of the brushless excitation system in a synchronous generator (SG) is the slow de-excitation response obtained during a load rejection. That is why voltage overshoots may be observed on the generator terminals. This behavior is mainly due to the exciter machine response time and the rotating diode bridge which is not able to quickly de-excite the generator by negative excitation voltages. This paper presents a new brushless de-excitation structure able to perform a quick de-excitation of the generator by providing controlled negative excitation voltage to the generator main field winding. The proposed structure is based on a new brushless de-excitation machine, called a control machine, and mounted on the same shaft of the generator and the brushless exciter. The brushless control machine is a low power one and used to transfer the orders from the voltage regulator to the discharge system located on the rotor side of the main generator. The dynamic performance of the proposed de-excitation system is evaluated in terms of system stability, voltage regulation response times and voltage overshoots during different load rejection tests. The proposed system is compared to the conventional brushless excitation system without the proposed de-excitation structure. In addition, a comparison is done with the static excitation system. The simulation tests are realized on an experimentally validated model of 11kVA synchronous generator developed in Matlab/Simulink.

show abstract