Design and Implementation of Hybrid-Switching Predictive Current Controllers for Four-Switch Three-Phase Inverter-Fed Interior Permanent Magnet Synchronous Motor Drive Systems(1/2)

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Project title

Code/計畫編號

MOST109-2221-E019-022-MY2

Translated Name/計畫中文名

三相四開關變頻供電型內藏式永磁同步電動機驅動系統之混合切換預測電流控制器的設計與實現(1/2)

Project Coordinator/計畫主持人

Cheng-Kai Lin

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Electrical Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=13535889

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

1180千元

ResearchField/研究領域

能源工程

如今，模型預測控制器已成功應用於各種電動機驅動系統中。這些控制器可以將電動機的多變量特性和非線性因素納入設計考慮，這將有助於在實際系統中的實現。但是，某些缺點和技術瓶頸限制了此類控制器在三相四開關變頻器中的開發與應用。以模型預測電流控制器為例，它依賴系統模型和相關參數，從而對參數誤差、不匹配和外部干擾是敏感的。此外，在三相四開關變頻器中使用四種基本切換模式將輸出更大的電流誤差和漣波。換句話說，在每次取樣週期中施加單個電壓向量可能會限制或降低電流預測的性能。有鑑於此，提出了一個為期兩年的研究計畫，專為三相四開關變頻器供電型內藏式永磁同步電動機驅動系統提供兩個實用的控制器，即混合切換模型式預測電流控制器和混合切換無模型式預測電流控制器。在第一年中(中華民國109年8月1日至110年7月31日)，混合切換模型式預測電流控制器將實現於在由三相四開關變頻器供電型內藏式永磁同步電動機驅動系統中。該控制器通過在每個採樣週期中施加兩個可調變的主動向量來預測未來定子電流。此外，所對應的責任週期都是在線計算以達到最佳調變。如此，三相四開關變頻器的切換模式將從基本的四個增加到十個以有效地減少預測誤差。在這十種切換模式中，所提控制器可以根據成本函數最小化過程選擇最佳的一種。所選的切換模式及其對應的責任週期都將在下一個採樣週期內被施加。另一方面，出於比較目的，在第二年中(中華民國110年8月1日至111年7月31日)混合切換無模型式預測電流控制器將被實現在相同的驅動系統中。值得一提的是，由於所提控制器是基於電流差檢測技術，因此它可以消除由參數不匹配和反電動勢估測誤差而引起在預測電流控制方面的困難。為了實現混合切換，所提兩個控制器都有十種切換模式可供使用，其中六種模式可以調變兩個電壓向量，而其餘四種基本模式則以施加單電壓向量為基礎。最後，將提供實驗結果，由德州儀器TMS320F28379D微控制器所實作的，以及模擬結果，以說明、分析和比較所提兩種控制器的性能。Nowadays, model predictive controllers have been successfully applied to various motor drive systems. These controllers can take the multi-variable characteristics and nonlinearities of motors into the design considerations, which will help the implementation in practical systems. However, certain drawbacks and technical bottlenecks limit the developments and applications of such controllers in four-switch three-phase inverters (FSTPIs). Taking the model predictive current controller, for instance, it depends on the system model and related parameters, yielding sensitivity to parametric errors, mismatches, and external disturbances. Furthermore, using four basic switching modes in the FSTPI will output more significant current errors and ripples. In other words, applying a single voltage vector in each sampling period may limit or degrade the performance of the current prediction. In view of this, a two-year research project is proposed to specifically provide two practical controllers for the FSTP inverter-fed interior permanent-magnet synchronous motor (IPMSM) drive system, that is, the hybrid-switching model predictive current controller (HS-MPCC) and the hybrid-switching model-free predictive current controller (HS-MFPCC). During the first year (R.O.C. 109-08-01 to 110-07-31), the HS-MPCC will be implemented in the FSTP inverter-fed IPMSM drive system. This controller predicts future stator currents with modulated two active-voltage vectors applied in each sampling period. Moreover, the corresponding duty cycles are calculated online to achieve optimal modulation. In this way, the switching modes of the FSTPI will be increased from four to ten to reduce the prediction errors effectively. Among these ten switching modes, the proposed controller can select the best one according to the cost function minimization process. Both the selected switching mode and its corresponding duty cycles will be applied in the next sampling period. On the other hand, in the second year (R.O.C. 110-08-01 to 111-07-31), for comparison purposes, the HS-MFPCC will be implemented in the same drive system. It is worth mentioning that because the proposed HS-MFPCC is based on current-difference detection technology, it can eliminate the difficulties in predictive current control caused by the parameter mismatch and back-EMF estimation error. To achieve hybrid switching, both proposed controllers have ten switching modes available, six of which can modulate two voltage vectors, while the remaining four basic modes are based on applying a single voltage vector. Finally, experimental results, implemented by the Texas Instruments TMS320F28379D microcontroller, and simulation results will be provided to illustrate, analyze, and compare the performance of the two proposed controllers.

Keyword(s)

預測電流控制器
雙核心微控制器
三相四開關變頻器
內藏式永磁同步電動機
Predictive current controller
dual-core microcontroller
four-switch three-phase inverter
interior permanent-magnet synchronous motor

DSpace CRIS

Design and Implementation of Hybrid-Switching Predictive Current Controllers for Four-Switch Three-Phase Inverter-Fed Interior Permanent Magnet Synchronous Motor Drive Systems(1/2)

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