Harmonics Reduction for Resolver-to-Digital Conversion via Second-Order Generalized Integrator With Frequency-Locked Loop

Guo, Meishan; Wu, Zhong; Qin, Haoye

doi:10.1109/jsen.2021.3052114

Cited by 19 publications

(5 citation statements)

References 29 publications

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“…To verify the effectiveness of the proposed method, simulation is conducted on the MATLAB/Simulink platform. In the simulation, the envelope signals of the resolver are directly generated with harmonics similar to [21]. The harmonic ratios are set as Table Ⅰ.…”

Section: A Simulation Resultsmentioning

confidence: 99%

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Suppressing Harmonics in Resolver Signals via FLL-Based Complementary Filters

Wang

Shi³

2021

IEEE Access

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In order to obtain accurate angular position and velocity from resolver signals, Resolver-to-Digital Conversion (RDC) is necessary. However, there are inevitable harmonics in resolver signals, which will deteriorate RDC accuracy seriously. Although the harmonics of resolver signals can be suppressed by using low-pass filters (LPFs), the phase lag of LPFs will result in additional errors in RDC, especially for the suppression of lower-order harmonics. In this paper, a novel filtering strategy is proposed for resolver signals by combining two complementary filters (CFs) with a frequency locked loop (FLL). Firstly, CFs are designed for the sinusoidal and cosinusoidal channels by using the natural orthogonality in the resolver signals. Each CF consists of two LPFs assisted by the estimated frequency from FLL with a frequency discriminator and a second-order observer. Secondly, a frequency discriminator is designed to detect the frequency error between the resolver signals before and after CFs. Thirdly, a second-order observer is designed to estimate the signal frequency by regulating the frequency error. Compared with conventional LPFs, FLL based CFs can suppress the low-frequency harmonics without phase lags and can improve RDC accuracy. Simulation and experimental results demonstrate the effectiveness of the proposed strategy.INDEX TERMS Resolver-to-digital conversion (RDC), low-pass filter (LPF), frequency locked loop (FLL), complementary filter (CF).

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Section: A Simulation Resultsmentioning

confidence: 99%

“…However, it is very difficult to achieve highprecision estimates for all harmonics. Although the secondorder generalized integrator with FLL in [21] could filter resolver signals without estimation of harmonics, it was an adaptive notch filter in essence and could not suppress lowerorder harmonics as well.…”

Section: Introductionmentioning

confidence: 99%

Suppressing Harmonics in Resolver Signals via FLL-Based Complementary Filters

Wang

Shi³

2021

IEEE Access

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“…Similarly, the time-domain equation of the whole system integrating SSLKF and B-type SOGI is shown in equation (13), and the equation of that combining SSLKF and C-type SOGI is written as equation (14).…”

Section: System Stability Analysis and Parameter Designmentioning

confidence: 99%

“…SOGI is a common second-order filter, which can generate two mutually orthogonal signals at the same time, and its transfer function has infinite gain at a specific frequency. Different SOGIs with different structures are applied to PLL, and different results can be obtained under different supply voltages [12][13][14]. e literature [15] proposed three kinds of SOGIs with different structures and applied them to the common three-phase synchronous coordinate PLL.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Three Structures of Second-Order Generalized Integrator and Its Application to Phase-Locked Loop of Linear Kalman Filter

Zeng

Yan

Xie

2022

Wireless Communications and Mobile Computing

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The present work explores the power quality problems of a microgrid in the aviation field, such as frequency offset or waveform distortion, caused by voltage imbalance and nonlinear load, to ensure the efficient and stable flight of aircraft, unmanned aerial vehicles, and other aircraft. There are many problems such as excessive harmonics, voltage imbalance, and direct current (DC) component in aviation variable frequency power supply voltage in microgrid under different conditions. Therefore, three kinds of second-order generalized integrators (SOGIs) with different structures are combined with linear Kalman filter phase-locked loops (PLLs). Besides, intelligent sensors are utilized for signal processing. Finally, simulation experiments are conducted to compare three SOGIs. The results show that the system is stable when the parameters k1 = 738.9553, k2 = 1092108.98405, k3 = 1477.91, and Ts = 0.000125 s and k ranges in [0.5, 3]. The angular frequency of PLL output is very low under the problems of many harmonics, three-phase voltage imbalance, and DC component ω g . The angular frequency ω g output by the PLL finally changes linearly with a change rate of 400 πrad/s2, so that the output phase angle θ g reaches a stable state. Thus, the proposed steady-state linear Kalman filter phase locking can accurately phase-lock the aviation variable frequency power supply. It provides an important reference for the power supply module in the microgrid to select the appropriate second-order generalized integrator to realize the accurate phase locking of the phase-locked loop under different conditions.

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“…The FSD technique also has limitations. [9]- [10]. The second-order generalized integrator (SOGI) frequency locked loop (FLL) technique can be used to overcome this limitation.…”

Section: Introductionmentioning

confidence: 99%

An Advanced RDC-Less System Independent of Motor Control PWM Frequency

Uhm,

Park,

Park

et al. 2023

IEEE Access

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In permanent magnet synchronous motors, a resolver to digital converter (RDC) is used to determine the position of a rotor with a resolver. Moreover, RDCs can be used to position rotors through resolver signals. However, such processes require significant costs and space. Recently, the motor control unit (MCU) has been required to implement RDC functions for cost reduction and functional safety. To implement the RDC function with the MCU, an excitation signal must be generated based on the pulse with modulation (PWM) signal. In this paper, with a single process core environment, the PWM frequency for motor control and the PWM frequency for generating the excitation signal are different. This study describes a demodulation method that enables accurate positioning of a rotor. The sampling time of the feedback signals is determined, and the rotor position is calculated through the second-order generalized integrator frequency locked loop technique. The rotor position information calculated from the proposed RDC-less system provides the same level of accuracy as that of a system with an RDC. The proposed method was verified through simulation and experiment. Moreover, this method can be applied to exclude RDCs from a single core system and process the resolver signal by the existing MCU.

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Harmonics Reduction for Resolver-to-Digital Conversion via Second-Order Generalized Integrator With Frequency-Locked Loop

Cited by 19 publications

References 29 publications

Suppressing Harmonics in Resolver Signals via FLL-Based Complementary Filters

Suppressing Harmonics in Resolver Signals via FLL-Based Complementary Filters

Comparative Analysis of Three Structures of Second-Order Generalized Integrator and Its Application to Phase-Locked Loop of Linear Kalman Filter

An Advanced RDC-Less System Independent of Motor Control PWM Frequency

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