HVDC transmission system models for power system reliability evaluation

Kuruganty, Sastry

doi:10.1109/wescan.1995.494081

Cited by 5 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An HVDC system based on thyristor valves, also referred to as a line commutated converter (LCC) is an efficient and economical way of transmitting large amounts of electrical power over long distances using overhead transmission lines or underground/submarine cables [4], [5]. The LCC based HVDC schemes can be used to interconnect two or more asynchronous power systems, where traditional ac connections cannot be used [6].…”

Section: C D I R E C T C U R R E N T E M F E L E C T R O M O T I V mentioning

confidence: 99%

“…Using the Equations (2-3) and (2)(3)(4), the relationship between the real power and reactive power of VSC based HVDC system connected to an ac system can be derived as given in Equation (2-5).…”

Section: P -Q Diagram For Vsc Operationmentioning

confidence: 99%

“…P c and Q c are the converter's rated real power and reactive power, N is the number of sub-modules per multi-valve and V c is the nominal value of sub-module voltage. The number 6 in Equation (3)(4)(5) arises from the fact that there are 6 multi-valves with N sub-modules per valve in a three phase converter [71].…”

Section: Impact Of Capacitor Size On Performancementioning

confidence: 99%

“…The capacitance value is chosen such that the second order harmonic in the circulating current is blocked. The filter capacitance is then given as in Equation (3)(4)(5)(6). Here, 2L f is the inductance of the filter and 0 is the fundamental angular frequency.…”

Section: Filter Parameters Calculationmentioning

confidence: 99%

“…Unlike the thyristors used in conventional LCC [4], [5], the VSC valves, such as IGBTs or GTOs can be turned 'ON' and 'OFF' using a gate signal without a voltage support from the ac system. Thus, the switching characteristics of VSC switching elements make the converter more controllable as compared with the LLC based HVDC converters [15].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

Gnanarathna

Gole

Jayasinghe

2011

IEEE Trans. Power Delivery

681

306

View full text Add to dashboard Cite

I AbstractThe recent introduction of a new converter topology, the modular multilevel converter (MMC) is a major step forward in voltage sourced converter (VSC) technology for high voltage, high power applications. To obtain a multilevel ac output waveform, a large number of semiconductor switches has to be used in the converter. The number of switches in the MMC for HVDC transmission is typically two orders of magnitudes larger than that in a two or three level VSC used in earlier generation. This large device count creates a computational challenge for electromagnetic transients (EMT) simulation programs, as it significantly increases the simulation time. The purpose of this research is to investigate whether the simulation can be speeded up. With the assumption of ideal switch operation and using an equivalent average capacitor value based approach, an average valued model of MMC is also proposed in this thesis. The average model can be accurately used in most of the system level studies.The control algorithms and other modeling aspects of MMC applications are also presented in this thesis. Abstract IIOne of the advantages of multilevel converters is the low operating losses as the smaller switching frequency of each individual power electronics switch and the low voltage step change during each switching. Using a recently developed, time domain simulation approach, the operating losses of the MMC converter are estimated in this thesis. When comparing the MMC operating losses against the losses of two-level VSC, the power loss for the two-level VSC is found to be significantly higher than the power loss of the MMC.

show abstract

Section: C D I R E C T C U R R E N T E M F E L E C T R O M O T I V mentioning

confidence: 99%

Section: P -Q Diagram For Vsc Operationmentioning

confidence: 99%

Section: Impact Of Capacitor Size On Performancementioning

confidence: 99%

Section: Filter Parameters Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations