Mitigation of Negative Impedance Instabilities in DC Distribution Systems

Fulwani, Deepak; Singh, Suresh

doi:10.1007/978-981-10-2071-1

Cited by 26 publications

(49 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some power systems need a multiconverter to provide the system with various power and voltage forms [22,36,37]; these are known as multiconverter power electronic system [24,25]. This type of system consists of large number of power electronic devices in parallel, cascade, stacking and splitting configurations for loads and source to achieve proper required operation [24].…”

Section: Problem Definitionmentioning

confidence: 99%

“…Negative incremental impedance impacts the power quality of the system and can lead to system voltage oscillations or even collapse, and reduces system damping. These system voltage oscillations put additional stress on the components and may lead to the system failing or its components being damaged [23,25].…”

Section: Negative Incremental Resistance Effects On the μGridmentioning

confidence: 99%

“…Therefore, this oscillation at the output will make the system unstable. Thus, the instability effects of CPL (INR) can be summarised on any power electronic system as mentioned in [2,25] as follows: CPL reduces the equivalent resistance of the system, causes a high inrush current as the voltage builds up slowly from its initial value, makes the system poorly dampened and impacts on the stability [37,38,47,53,54], which causes limit cycle oscillation in the DC bus voltage and currents and may lead to voltage collapse [23,53,55].…”

Section: Negative Incremental Resistance Effects On the µGridmentioning

confidence: 99%

“…Therefore, digital and nonlinear stabilising control methods must be applied to ensure large-signal stability [21,22,36,42,48,56,57]. Compensation Techniques of the instability of CPL can be achieved by adding an extra element like passive elements or devices to the power system, or redesigned the control loop of a source or load converter [25,58]. The following sections summarise the methods used to compensate for the instability effects of INR in previous years.…”

Section: Compensation Techniques Used To Combat the Instability Effecmentioning

confidence: 99%

“…To overcome the instability effect of INR, the CPL side Active Damping is considered when the source subsystem of a CPL is LC filter. The concept of this method is achieved by injecting a current or power into the CPL control loops to modify the input impedance Z in , such that Middlebrook's stability criteria are satisfied [2,25]. The third is adding auxiliary device that injects the desired compensating current within operation range system.…”

Section: Active Dampingmentioning

confidence: 99%

See 4 more Smart Citations

Constant Power Loads (CPL) with Microgrids: Problem Definition, Stability Analysis and Compensation Techniques

et al. 2017

View full text Add to dashboard Cite

This paper provides a comprehensive review of the major concepts associated with the µgrid, such as constant power load (CPL), incremental negative resistance or impedance (INR/I) and its dynamic behaviours on the µgrid, and power system distribution (PSD). In general, a µgrid is defined as a cluster of different types of electrical loads and renewable energy sources (distributed generations) under a unified controller within a certain local area. It is considered a perfect solution to integrate renewable energy sources with loads as well as with a traditional grid. In addition, it can operate with a conventional grid, for example, by energy sourcing or a controllable load, or it can operate alone as an islanding mode to feed required electric energy to a grid. Hence, one of the important issues regarding the µgrid is the constant power load that results from the tightly designed control when it is applied to power electronic converters. The effect of CPL is incremental negative resistance that impacts the power quality of a power system and makes it at negative damping. Also, in this paper, a comprehensive study on major control and compensation techniques for µgrid has been included to face the instability effects of constant power loads. Finally, the merits and limitations of the compensation techniques are discussed.

show abstract