本文提出具相位交錯並聯換流器之市電併聯設計,主控模組分別送出同步訊號與交錯相位移訊號達成換流器同步輸出與電力系統同步運轉,換流器相互並聯將能源饋回電力網路分攤負載用電之主要目的。 數位訊號處理器取得電流訊號與電壓訊號經控制器回授控制補償,利用控制性區域網路(CAN bus)傳遞模組間的電流訊息,經由零點偵測電路做為與市電併聯電壓基礎,以相位交錯式並聯換流器方式將脈波寬度調變錯開一個角度抵消電流漣波,減少換流器輸出之電流漣波,有效降低切換頻率過高對整個電力系統電磁波干擾(EMI)影響,雙模組輸出與110 V/60 Hz交流弦波電力系統網路併聯連結運轉,達成降低電流漣波失真並聯模組之電源回送至電力系統。
A grid-tied parallel inverter with interleaving phase shift is proposed in this thesis. The master module generates synchronous and interleaving phase shift signals to achieve grid-tied system that make the inverter to output current to the power line and share the load. The DSP TMS320F2812 is used for system feedback control with voltage and current by using A/D converters to generate the output current close to sine wave. The output current values are transmitted via CAN (Control area network) between inverter modules. The grid-tied system uses zero-voltage-detection circuit to synchronize the inverter currents with grid voltage. The PWM voltage for each switching interval is interleaving to reduce the total output current ripple so that the switching frequency can be reduced and the power system EMI problem can be alleviated as well. The experiment system is with parallel inverters to reduce output current harmonic distortion.