Unity power factor PWM rectifier reducing the number of sensors

Itako, Kazutaka; Mori, Takeaki

doi:10.1109/epe.2005.219675

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…This issue must be taken into account when a load power feedforward compensation is to be implemented. In this case, an estimator of the load power mean value is more effective than a direct measurement, since the high harmonics of the load power are not feedforwarded [21]. Figs.…”

Section: A Dynamic Behavior In Presence Of Load Changesmentioning

confidence: 97%

“…Note that the output transformation (18) choice is crucial for obtaining the simple linear error dynamics 1 given by (21). Therefore, the constant gains g 1 and g 2 , in (21), can be calculated by applying linear techniques, like pole placement, quadratic optimization techniques, etc.…”

Section: DC Voltage Controlmentioning

confidence: 99%

“…When the VSC is loaded with another VSC the consumed power contains high frequencies components, so it is not a good solution to inject the measured value [4], [21], [22]. For this reason, many authors have proposed different strategies with load estimation.…”

Section: Introductionmentioning

confidence: 98%

“…For this reason, many authors have proposed different strategies with load estimation. In [21], [23] software sensors based on open loop predictors were used to estimate the load current. Other researchers implemented observers (closed-loop predictors) for improving performance and robustness.…”

Section: Introductionmentioning

confidence: 99%

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Observer-based nonlinear controller for a three-phase Voltage-Source Converter feeding a constant power load

León

Solsona

Valla

2008

2008 IEEE International Symposium on Industrial Electronics

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In this paper an observer-based controller for Voltage Source Converters (VSCs) feeding constant power loads is introduced. The observer is used for estimating the power load and this estimate is feedforwarded to build a nonlinear controller in order to improve the whole system performance. The proposed observer presents linear error dynamics. The main advantage of our proposal is that linear error dynamics allows to design the observer by using linear techniques. In this way, the observer transient performance (i. e. speed of convergence) is clearly established in the whole range of VSC operation. The feedback controller is based on input-output feedback linearization considering an energy output. In this way, complete input-output linearization is obtained such that linear control strategies can be used in outer loops. Simulation results including performance in presence of commutation frequency, measurement filters delays, and parameters uncertainties are presented to validate the proposed technique. I. INTRODUCTIONVoltage source converters (VSCs) based on switched electronic devices are being introduced by manufacturers in many industrial applications. These converters present unity power factor, sinusoidal input current, high performance of the DC voltage control, bi-directional power flow, and low total harmonics distortion index. Among others, these features are very useful in AC-DC-AC power conversion, adjustable speed drives, active power filters. In high power applications, VSCs are basic cells of several technologies introducing Flexible AC Transmission Systems (FACTS). Consequently, controllers allowing very high performance VSCs are important in current and future applications.It must be noted that VSC model is nonlinear, MultiInput-Multi-Output and it presents a non-minimum phase feature when DC-Link voltage is considered as output. In order to control VSCs several strategies have been introduced by researchers. Controllers based on Jacobian linearization around an equilibrium point have been introduced in [1], [2]. Among nonlinear approaches, fuzzy logic control [3], [4], passivity-based control [5], Lyapunov-based control [6], backstepping technique [7], and input-output linealization based on Feedback Linearization (FL) [8] have been applied. A nonlinear cascade controller including feedback linearization

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Section: A Dynamic Behavior In Presence Of Load Changesmentioning

confidence: 97%

Section: DC Voltage Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Observer-based nonlinear controller for a three-phase Voltage-Source Converter feeding a constant power load

León

Solsona

Valla

2008

2008 IEEE International Symposium on Industrial Electronics

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“…The controller is more rugged, more reliable and, also the hardware is less expensive. Moreover, in many applications the current load may contain high frequencies being more convenient to design a mean value estimator, than to obtain a true measurement [29].…”

Section: Introductionmentioning

confidence: 99%

High-performance control of a three-phase voltage-source converter including feedforward compensation of the estimated load current

León

Solsona

Busada

et al. 2009

Energy Conversion and Management

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In this paper a new control strategy for voltage-source converters (VSC) is introduced. The proposed strategy consists of a nonlinear feedback controller based on feedback linearization plus a feedforward compensation of the estimated load current. In our proposal an energy function and the direct-axis current are considered as outputs, in order to avoid the internal dynamics. In this way, a full linearization is obtained via nonlinear transformation and feedback. An estimate of the load current is feedforwarded to improve the performance of the whole system and to diminish the capacitor size. This estimation allows to obtain a more rugged and cheaper implementation. The estimate is calculated by using a nonlinear reduced-order observer. The proposal is validated through different tests. These tests include performance in presence of switching frequency, measurement filters delays, parameters uncertainties and disturbances in the input voltage.

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