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首页> 外文会议>2017 15th International Conference on Quality in Research : International Symposium on Electrical and Computer Engineering >Design and control of a 10kw three-phase grid-tied back to back inverter
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Design and control of a 10kw three-phase grid-tied back to back inverter

机译：10kw三相并网逆变器的设计与控制

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摘要

Inverters in back to back (B2B) connection are utilized to convert the voltage and frequency of the power source to another format. Typical application of inverters is the wind power system. This study presents a B2B inverter for equal voltage and frequency format conversion in which one inverter works to get power from the grid to charge the DC capacitor and another inverter returns most of the active power back to the grid and retain a few powers to maintain the DC-link voltage. The power grid affords only the power loss of the inverters, which benefits the test of the inverter rated above 10kW under general distribution line. A proportional-resonant (PR) controller in a stationary frame in place of a proportional-integral (PI) controller in a synchronous frame was adopted to condition the B2B inverter AC current for grid connection due to the advantages such as instantaneous tracking capability as well as low-cost computational resources. To mitigate the startup transient for grid connection, the instantaneous grid voltage was feedforwarded to the inverter voltage command. The B2B inverter was run according to the proposed control strategy under various conditions such as the reactive power control and the active and reactive power controls. Experimental results show that the power returns to the power grid is close to originally put in and the proposed B2B inverter can be tested under the distribution line with the power capability over 10kW.
机译：背对背（B2B）连接的逆变器用于将电源的电压和频率转换为另一种格式。逆变器的典型应用是风力发电系统。这项研究提出了一种用于等电压和频率格式转换的B2B逆变器，其中一个逆变器工作以从电网获取功率以对DC电容器充电，而另一个逆变器将大部分有功功率返回到电网，并保留一些功率以维持功率。直流母线电压。电网仅提供逆变器的功率损耗，这有利于在一般配电线路下对额定功率超过10kW的逆变器进行测试。由于具有瞬时跟踪功能等优点，因此采用固定框架中的比例谐振（PR）控制器代替同步框架中的比例积分（PI）控制器来调节B2B逆变器交流电流以进行电网连接作为低成本的计算资源。为了减轻电网连接的启动瞬变，将瞬时电网电压前馈至逆变器电压命令。 B2B逆变器根据提出的控制策略在各种条件下运行，例如无功功率控制以及有功和无功功率控制。实验结果表明，返回电网的功率接近最初投入的功率，所提出的B2B逆变器可以在功率超过10kW的配电线路下进行测试。

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