Line voltage sensorless three phase PWM converter by tracking control of operating frequency

Ohnishi, Tokuo; Fujii, Kenzo

doi:10.1109/pccon.1997.645620

Cited by 19 publications

(10 citation statements)

References 2 publications

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“…Conventionally, synchronization is achieved using some variant of the phase-locked loop (PLL) to detect the angle of the measured grid voltage. If the grid voltage is not measured, the synchronization can be based on: 1) control error (i c,ref − i c ) of current control [1]; 2) DC-link power balance [2]; 3) instantaneous power theory [3]; 4) duality between the grid-connected converter and the PWM inverter-fed electric motor [4,5]; 5) direct estimation [6,7]; or 6) adaptive model-based estimation [8]. The above-mentioned methods have been developed for a grid-connected converter using the conventional L filter, but in the case of the resonant LCL filter, only a few [9][10][11][12][13] grid-voltage sensorless synchronization methods exist.…”

Section: Introductionmentioning

confidence: 99%

State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter

Kukkola

Hinkkanen²

2014

2014 16th European Conference on Power Electronics and Applications

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Section: Introductionmentioning

confidence: 99%

State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter

Kukkola

Hinkkanen²

2014

2014 16th European Conference on Power Electronics and Applications

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“…So various types of single-phase PFC converter circuits to improve the ac current waveform have been developed and used [2]- [6]. The conventional PFC converter is constructed by a boost chopper circuit with a switching device in the dc side of the diode bridge rectifier circuit [2].…”

Section: Introductionmentioning

confidence: 99%

“…So various types of sensorless PFC converter have been proposed to simplify and to improve the reliability of the control system [6]- [11]. But the sensorless control systems become somewhat complicated to estimate the lost control variables by sensorless control.…”

Section: Introductionmentioning

confidence: 99%

DC Voltage Sensorless Single-Phase PFC Converter

Ohnishi

Hojo

2004

IEEE Trans. Power Electron.

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We propose a simple dc voltage sensorless single phase PFC converter by detecting an ac line voltage waveform. Both dc voltage and ac current sensors used in the conventional PFC converter are not required to construct the control system. The conventional converter circuit with a boost chopper circuit in the dc side from a rectifier circuit is used as the main PFC converter circuit. In the control system, the circuit parameters such as a series inductance and equivalent load resistance value are used to generate the sinusoidal current waveform. The dc voltage is directly controlled by the command input signal (= ) for the boost chopper circuit. The dc voltage regulation is small because of the feed forward control for the ac line voltage and no dependence of the circuit parameters. The sinusoidal current waveform in phase with the ac line voltage can be obtained. The feasibility of the proposed control system is verified by some simulation and experimental results.Index Terms-ac line voltage, dc voltage regulation, PFC converter.

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“…, and θ α ω2 = dt d (9) where 1 α and 2 α are design parameters that control the observer bandwidth. To prove the stability of the proposed observer the error dynamics will be analyzed.…”

Section: B Line Position Observer (Pll)mentioning

confidence: 99%

“…To reduce cost of VSC different control methods trying to estimate line voltages (to reduce number of voltage sensors to only DC bus voltage) and reconstructing three phase currents from DC link current were investigated [9] - [12]. This paper presents an original method to eliminate line voltage sensors.…”

Section: Introductionmentioning

confidence: 99%

A novel control method of a VSC without AC line voltage sensors

Agirman¹,

Blasko²

Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248)

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The original algorithm to estimate position of line voltage essential for operation of regenerative three-phase PWM controlled VSC is presented. The PI current regulator in D axis of VSC current control is modified to obtain angle error signal. The angle error signal drives the observer (similar in structure to PLL) which provides position or angle of line voltages. To achieve fast and reliable lock with utility system with minimal duration of transients, initial line voltage position is estimated first. The initial line voltage position estimation is done by measuring amount of current change when zero state voltage vectors were applied at the output of inverter for defined time intervals. After that continuous position estimation by observer is enabled. To estimate magnitude of line voltage another observer in the q axis is used. The observer is implemented in synchronous frame of reference and is driven by Q axis current error. Theoretical results are experimentally verified.

show abstract

Line voltage sensorless three phase PWM converter by tracking control of operating frequency

Cited by 19 publications

References 2 publications

State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter

State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter

DC Voltage Sensorless Single-Phase PFC Converter

A novel control method of a VSC without AC line voltage sensors

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