近年來，隨著科技快速發展，對能源的要求及需求與日俱增，單
純擴充發電廠的發電容量並不能最有效率的解決問題，加上環保意識
的抬頭，各國逐漸將政策重心轉向於發展永續能源的應用，為了解決
集中式發電(Centralized Power Generation)與電網穩定性的問題，分散
式能源(Distributed Power Generation)及微電網系統被隨之提出。本文
以數位控制實現可併網之單相全橋換流器，可透過並聯提高功率容
量，輸出端使用 LCL 型濾波器，濾除開關次諧波避免併網時造成電
網負擔。傳統上併網之控制法採用定功率控制(PQ Control)，在併入電
網時，電壓會由電網主導，故控制環會僅保留電流環。但在切換孤島
模式(Islanding Mode)時，控制環會由電流單環控制切換至電壓電流雙
環控制，因此在模式切換上需額外加入緩切換之控制，避免模式切換
時造成瞬間電壓或電流變化導致系統崩潰。本文之控制法採用下垂控
制法(Droop Control)代替定功率控制，為解決模式切換時的暫態變化
可能造成系統異常的問題，在併網模式及孤島模式皆保留電壓電流雙
環，避免在模式切換中控制環需調整之問題，且本文之架構為在孤島
模式下可彼此並聯提高功率容量，下垂控制控制亦常被用於無分流控
制匯流排之控制，具備避免並聯系統中具備傳輸線時所產生之問題，
如受電磁干擾導致信號異常、對系統擴充之自由度造成限制。本文透
過模擬軟體 PSIM 來驗證控制法及電路參數之合理性，用其建構一個
單臺換流器滿載 1k W，輸入電壓 380 V，輸出交流電壓 220 V 之系
統，系統中包含兩臺單相全橋換流器及一個模擬電網，本文使用之數
位信號處理器為 TMS320F280049。

In recent years, with the rapid development of science and technology,
the demand for energy are increasing day by day. Simply expanding the
power generation capacity of power plants cannot solve the problem
efficiently. Coupled with the rising awareness of environmental protection,
many countries are focus on developing the application of sustainable
energy. In order to solve the problems of centralized power generation and
grid stability, decentralized energy systems and micro-grid systems have
been proposed. In this paper, digital control is used to realize single-phase
full-bridge inverters that can be integrated into the grid and can be
connected in parallel. Traditionally, the control method of grid-connected
uses PQ control. The voltage is dominated by the grid, so the control loop
will only retain the current loop. But in the switching mode, the control
loop will be switched from the current single-loop control to the voltage
and current dual-loop control, and additional soft-switching processing to
improve transient performance. Therefore, this paper adopts the droopcontrol, and the voltage and current dual-loops are reserved in all mode.
Not only solve the problem that the control loop needs to be changed in the
mode switching but also droop-control is also often used for the control of
non-shunt control busbars. In this paper, the simulation software PSIM is
used to verify the rationality of the control method. It is used to construct
a system with a single inverter with the rated power of 1 kW, a digital input
voltage of 380 V, and an output AC voltage of 220 V. The system includes
two single-phase inverters. Full-bridge inverter and an analog power grid,
the digital signal processor used in this paper is TMS320F280049.

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