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The price
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A UPFC is a type of power controller that has shown to be more efficient in the control of power flow than a SSSC. A STATCOM can be used to inject power flow into the controller whether it be a UPFC or a SSSC.
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A UPQC has the same structure as a UPFC. It can inject current in shunt and voltage in series simultaneously in a dual control mode. Therefore it can perform both the functions of load compensation and voltage control at the same time. The UPQC must also inject unbalanced and distorted voltages and currents and hence its operating characteristics are than that of a UPFC. Furthermore their operation philosophy is different. The UPQC is also an (PQ) enhancement device. UPFC and can operate under non-balanced conditions, whereas the UPFC is assumed to operate under balanced sinusoidal conditions. Source: A. Ghosh, G. Ledwich - Power Qualtiy Enhancement using custom power devices (found at google: E-books)
power system stability, PSS, FACTS, SVC, TCSC, TCPS, STATCOM, SSSC, UPFC, IPFC
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advantages : electricity disadvantages: no electricity
gramophone
Its perfect therew are no disadvantages Its perfect therew are no disadvantages
Advantages are good; pluses. Disadvantages are bad; minuses.
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Disadvantages of stockpiling