即時模擬可以分為三種：硬體閉迴路即時模擬(Hardware-in-the-loop)、快速控制原型(Rapid control prototyping)以及軟體閉迴路即時模擬(Software-in-the-loop)。硬體閉迴路即時模擬是由模擬的試驗場(experiment plant)與實際控制器組成，快速控制原型則是由實際的試驗場與模擬的控制器組成，而軟體閉迴路即時模擬是由模擬的試驗場與模擬的控制器組成。
本論文提出以LabVIEW與RTDS即時數位模擬機結合之實驗架構進行配電型靜態同步補償器(Distribution Statc Synchronous Compensator, D-STATCOM)與主動式電力濾波器(Active Power Filter, APF)之硬體閉迴路即時模擬。控制器包含鎖相迴路，直流電壓調節器，功因校正器，諧波補償器以及電流控制器。
實驗方法為利用LabVIEW開發平台提供的即時作業系統RTOS以及FPGA建構控制器以及資料擷取介面，並於RTDS中建構以電壓源換流器為基本架構的D-STATCOM與APF的硬體電路。實驗結果與離線模擬軟體PSCAD/EMTDC相互驗證並進行比較與討論。此驗證平台可做為日後進階控制器設計之硬體閉迴路即時模擬實驗平台。

A real time simulator can be classified into three types, rapid control prototyping, hardware-in-the-loop, and software-in-the-loop simulation. A hardware-in-the-loop system consists of a simulated plant interacting with an actual controller. A rapid control prototyping system consists of an actual plant interacting with a simulated controller. Software-in-the-loop system is made of a simulated plant interacting with a simulated controller.
This thesis propose a Hardware-in-the-loop(HIL) simulation of D-STATCOM and APF. The experiment structure combines the LabVIEW platform, which is the controller, and RTDS, which provides the experiment plant of HIL. The controller include, DC voltage regulator, phase-locked-loop(PLL), power factor correction, harmonic compensation and current controller.
The experiment is completed by utilizing the LabVIEW RTOS as the kernel controller, FPGA as the data acquisition interface, and build D-STATCOM and APF circuit in RTDS.
The results are compared with those obtained from the offline simulation via PSCAD/EMTDC to show the validity of the proposed method. This platform can serve as a benchmark for testing hardware-in-the-loop simulation for the advanced controllers.

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