Effects of controlled shunt and series compensation on damping in the Nordel system

Comparison of Three Electromechanical Oscillation Damping Estimation Methods

“…The biggest load from each area of the Southern part of Finland is randomly varied. At these locations the variations excite the 0.3 Hz and the 0.5 Hz oscillations [29]. The individual loads follow the uniform distribution with a fixed margin.…”

“…In the 0.3 Hz mode, the generators in southern Finland oscillate against the generators in Southern Sweden and Norway. In the 0.5 Hz mode, the generators in Southern Norway and Southern Finland oscillate against the generators in Southern Sweden [29]. Oscillations of the 0.3 Hz mode arise typically when power is transferred from Southern Finland to Southern Sweden via interconnecting ac lines at North, and damping of the oscillations sets the limit to power transfer capacity in that direction.…”

Applications of phasor measurement units and wide-area measurement system in Finland

“…In the end of 1990's some prolonged low-frequency power oscillations were observed in Finland. After that the phenomenon has been studied in comprehensive manner [1][2] [3] and several actions in order to overcome the stability related restrictions in transmission capability has been taken. These actions have included tuning of power system stabilizers (PSS) of large generators and HVDC links, installing of series compensation to the main transmission corridors and a static var compensator (SVC) close to the strongly oscillating generators.…”

“…In Finland the application of power system stabilizers and power oscillation damping controls in order to improve the damping of 0.3 Hz inter-area oscillations has been studied thoroughly [1][2] [3] and based on those studies several damping controllers have been retuned and implemented [4]. All the controllers applied at the moment are based on local measurement signals, and considering the present dynamic characteristics of Finnish power system their performance can be considered very good.…”

Best location of SVC to improve first swing stability limit of a power system

“…The above location index can be used to rank the candidate buses and identify the most suitable location of SVC to improve the FSS limit of a power system. The suitable or effective locations of SVC to improve the steady state stability and damping of a power system are identified in [21,22]. This paper proposes a method of determining the location index of a SVC to improve the first swing stability limit of a multi-machine system and is based on the concept of transient energy function method.…”