SVC dynamic analytical model
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Citations
Stability Analysis of Oscillations in SVCs
Modulation Processes and Mathematical Models of the TCR
Inrush Current Suppression Method of the Reactive Power Compensator by using a Linear Region of the Switch
A Neuro-Predictive Controller Scheme for Integration of a Basic Wind Energy Generation Unit with an Electrical Power System
References
Power System Stability and Control
Phasor dynamics of thyristor-controlled series capacitor systems
Dynamic response of a thyristor controlled switched capacitor
Analytical modeling of thyristor-controlled series capacitors for SSR studies
Analytical modelling of HVDC-HVAC systems
Related Papers (5)
A Novel SVC Allocation Method for Power System Voltage Stability Enhancement by Normal Forms of Diffeomorphism
Frequently Asked Questions (11)
Q2. What is the common use of a PLL?
A PLL is typically used with thyristor converters to provide the reference signal that follows the synchronizing line voltage or current.
Q3. What is the effect of the PLL on the system dynamics?
It is seen that the PLL gains have significant influence on the system dynamics and that the frequency of the dominant oscillatory mode reduces, accompanied by a small reduction in mode damping (branch “a”).
Q4. What is the d-q component of the rotating susceptance?
In order to link the d-q components of the rotating susceptance (15) with the controller module, these components are further converted to magnitudeangle components using the x-y to polar co-ordinate transformation [8].
Q5. What is the way to verify the accuracy of a PLL?
Model verification in the time and frequency domains against a PSCAD simulation confirmed very high accuracy for f<25Hz, and fair accuracy even beyond the first harmonic frequencies.
Q6. What is the corresponding input-side index of the controller?
The input matrices, Bij, take the second index “j” from the particular input-side connecting subsystem (i.e.: Bacco is the AC model input matrix that takes input signals from the controller), and the output matrices Cik have the second index “k” associated with the linking subsystem that takes the particular output vector.
Q7. What is the way to describe the phase response in MATLAB?
Regarding the overall time and frequency domain responses, and being aware of the phase response errors, it can be concluded that the model has reasonably good accuracy when employed as a design and analysis tool for phenomena such as subsynchronous resonance, or interactions with other fast FACTS/HVDC controls.
Q8. What is the effect of the PLL on the speed of response?
Although not shown in Figure 10, the increase in the PLL gains increases the speed of response and it is suggested that this effect on the positioning of the dominant mode can be exploited in the design stage to improve performance, or to avoid negative interactions at a particular frequency.
Q9. What is the test system in use?
The test system in use consists of a SVC connected to an AC system that is represented by an equivalent impedance and a local load, as shown in Figure 1.
Q10. What is the susceptance value in the steady state?
Assuming small perturbations around the steady state the authors have:)( 222 vvv o ∆+= (9) )/(// tcrtcrtcr LLL 111 0 ∆+= . (10) Small perturbations are justified assuming an effective voltage control at the nominal value.
Q11. How many times reduced gains are seen in Figure 10?
As the gains are reduced, the eigenvalues migrate from the original “x” to the location “o”, representing ten times reduced gains.