Abstract
This paper presents small signal stability analysis of distribution networks with electric springs (ESs) installed at the customer supply points. The focus is on ESs with reactive compensation only. Vector control of ES with reactive compensation is reported for the first time to ensure compatibility with the standard stability models of other components such as the interface inverter of distributed generators (DGs). A linearized state-space model of the distribution network with multiple ESs is developed which is extendible to include inverter-interfaced DGs, energy storage, active loads, etc. The impact of distance of an ES from the substation, proximity between adjacent ESs and the R/X ratio of the network on the small signal stability of the system is analyzed and compared against the case with equivalent DG inverters. The collective operation of ESs is validated through simulation study on a standard distribution network.
Highlights
T HE CONCEPT of Electric Spring (ES) was introduced to regulate the voltage at the point of coupling (PoC) in the face of intermittency in renewable power [1]
Inverters etc., (ii) the paper did not report the effect of change in distribution network parameters on small signal stability and (iii) the inferences are based on the results from time-domain simulation without delving into the root cause through modal analysis
This paper addressed all these issues by proposing a way of using vector control for ES-Q which can be integrated in the stability model of a distribution network and microgrid with other distributed generators (DGs) inverters
Summary
T HE CONCEPT of Electric Spring (ES) was introduced to regulate the voltage at the point of coupling (PoC) in the face of intermittency in renewable (wind, solar) power [1]. As use of ES for voltage/frequency control attracts increasing attention, it is important to study the overall small signal stability of a distribution network with dense penetration of ESs under different scenarios which motivates this paper. Inverters etc., (ii) the paper did not report the effect of change in distribution network parameters on small signal stability and (iii) the inferences are based on the results from time-domain simulation without delving into the root cause through modal analysis. The original contributions of this paper are as follows: 1) Vector control of ES with only reactive power compensation (ES-Q) is reported for the first time which can be integrated in the stability model of distribution networks and microgrids with other DG inverters. An ES with reactive power compensation (ES-Q) is referred to as ‘Electric Spring (ES)’ and small signal stability is termed as just ‘stability’
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