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)
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There is no thermodynamic difference between them .
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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The cost of a Unified Power Quality Conditioner (UPQC) can vary significantly based on factors like its capacity, specifications, and manufacturer. Typically, prices can range from a few thousand to tens of thousands of dollars. Additional costs may include installation, maintenance, and any necessary upgrades to the electrical system. For precise pricing, it's best to consult with suppliers or manufacturers.
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power system stability, PSS, FACTS, SVC, TCSC, TCPS, STATCOM, SSSC, UPFC, IPFC
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