Munoz, JA (Munoz, Javier A.); Baier, CR (Baier, Carlos R.). Univ Talca, Dept Ind Technol, Talca 747C, ChileDigital signal processors (DSPs) and field-programmable gate arrays (FPGAs) are predominant in the implementation of digital controllers and/or modulators for power converter applications. This paper presents a systematic comparison between these two technologies, depicting the main advantages and drawbacks of each one. Key programming and implementation aspects are addressed in order to give an overall idea of their most important features and allow the comparison between DSP and FPGA devices. A classical linear control strategy for a well-known voltage-source-converter (VSC)-based topology used as Static Compensator (STATCOM) is considered as a driving example to evaluate the performance of both approaches. A proof-of-concept laboratory prototype is separately controlled with the TMS320F2812 DSP and the Spartan-3 XCS1000 FPGA to illustrate the characteristics of both technologies. In the case of the DSP, a virtual floating-point library is used to accelerate the control routines compared to double precision arithmetic. On the other hand, two approaches are developed for the FPGA implementation, the first one reduces the hardware utilization and the second one reduces the computation time. Even though both boards can successfully control the STATCOM, results show that the FPGA achieves the best computation time thanks to the high degree of parallelism available on the device

A mixed Linear Quadratic Regulator with an Integral action control technique applied to a Unified Power Quality Conditioner (UPQC) is presented. The proposed control approach becomes a robust strategy that is able to keep regulation and stability even under extreme parameters and load power factor variations. The design of the controller parameters uses the well known Riccati equation based on the discrete approximation of the linear model of the UPQC. Key waveforms based on simulated extensive work shows the feasibility of the proposed approach.

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The stationary analysis of a single-phase unified power quality conditioner is introduced. The decomposition of a single-phase waveform into a sum of sine and cosine functions gives a representation of the original signals and at the same time allows to find the operating region of the system. This is due to the fact that a model where all the state variables become dc quantities in steady state is obtained. The operating region establishes that sags and swells can be readily compensated by the series converter of the unified power quality conditioner. However, the range is limited by the power factor at the point of common coupling, the dc link voltage of the topology, and the load voltage reference. Furthermore, the angle of the load voltage to the PCC voltage is found to be arbitrary. However, it can be chosen to obtain either a maximum compensating range for sags and swells or to operate the topology at minimum losses. Extensive simulated results probe the theoretical considerations.