电气专业英语翻译...谢谢了!

Question

新能源并网发电是当前的研究热点，并网逆变器是实现电能馈送电网的重要环节。但是由于并网逆变器采用的PWM信号开关频率较低，导致输出电流含有较大的谐波。该文为降低开关频率造成的电流谐波，在并网逆变器中引入LCL滤波器取代典型的电感滤波器，并针对采用LCL滤波器对并网逆变器系统带来的不稳定性，提出了桥臂输出电流和电网输出电流双闭环的控制策略。准确获得电网电压的相位角，在电力电子装置设计中有重要的意义。对于需要系统电压同步的电力电子装置，相位信息的正确与否对控制性能有极大的影响。所以文中提出了一种基于智能PI控制的软件锁相环，通过同步旋转坐标跟踪原理，达到锁相的目的。由于引入了LCL滤波器，文中还对LCL滤波器的设计进行了分析。仿真结果证明利用LCL滤波器作为变换器和电网的接口可以有效抑制谐波电流，并网逆变器双闭环控制使系统稳定性和动态性进一步加强。

Answer 1

The new energy incorporation electricity generation is the current research hot spot, incorporates the invertor is realizes the electrical energy to present electrical network's important link.But because incorporates the PWM signalling switch frequency which the invertor uses to be low, causes the output current to include the big overtone.This article to reduce the current harmonics which the turn-on frequency creates, introduces the LCL filter substitution model in the incorporation invertor the inductance filter, and aims at uses the LCL filter to incorporate the instability which the invertor system brings, proposed the bridge arm output current and the electrical network output current double closed loop control policy.Obtains the network voltage accurately the phase angle, has the vital significance in the electric power electronic installation design.Regarding needs the systemic voltage synchronization the electric power electronic installation, the phase information correct or not has the enormous influence to the control performance.Therefore in the article proposed one kind based on the intelligent PI control's software phase-locked loop, through the synchronized revolving coordinate track principle, serves phase-lock's purpose.Because has introduced the LCL filter, in the article has also carried on the analysis to the LCL filter's design.The simulation result proved that may suppress the harmonic current effectively using the LCL filter as the converter and electrical network's connection, incorporates the invertor double closed-loop control to cause the system stability and the dynamic further strengthens.