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With the increasing penetration of distribution generations (DGs), the stability problems of the power system become more and more serious. Virtual synchronous generator (VSG) as an effective solution, can improve the converter inertia, but there is still possibility of power oscillation due to the small line impendence ratio R/X. In this paper, a small signal dynamic model is derived for the second-order...
The switching frequency of the medium-voltage high power converter is seriously limited, e.g. below 1kHz, due to the switching loss and therefore thermal constraint. Popular LCL filter is difficult to meet grid codes with normal parameters and size, instead, large system volume and expense are unavoidable. However, LCL-RL (RL damping LCL) filter with the same physical size has better filter effect,...
Three-phase shunt Active Power Filters (APFs) are connected to the grid through inductance or LCL filter. Comparing to single L filter, LCL filter is more effective, e.g. better switching harmonics suppression and lower output impedance, but such solution causes stability problems. In order to assure stable operation either a damping resistor or active damping algorithm has to be used. However, extra...
Shunt Active Power Filters (SAPF) could restrain harmonic current in distribution grid effectively and their compensation precision relies heavily on the design of current loop controllers. Since the reference and feedback signal of the current controller are composed by different harmonic components and the bandwidth of conventional ProportionIntegral (PI) controller is limited, this controller cannot...
Shunt active power filter (SAPF) is suitable to compensate current-type harmonics caused by nonlinear load, but high compensation precision is difficult to be obtained due to very high slew rate of harmonic current, output impendence of voltage source converter (VSC) and control loop phase lag. LCL-filter with high attenuation ratio and small LC parameters is appropriate to be used as output filter...
LCL-type filter possessing sufficient attenuation ratio for switching ripple with small LC parameters is appropriate to be used as output filter to get high slew rate of compensation current. However, LCL-filter, as a three order resonant circuit itself, is difficult to be stable. This paper compares active and passive methods for LCL-filter resonance damping; assesses their suitability for the high...
In active power filter (APF) application, LCL-filters are prevalently served as output filters due to high slew rate of compensation current and sufficient attenuation ratio for switching frequency with small LC parameters. In order to realize the stable control of LCL filters, appropriate damping is required. Both the classical PI control method with a damping resistor and active damping without...
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