融资约束如何影响出口边际：来自我国制造业行业的证据

研究了一种适用于兼顾无功补偿的微网光伏并网逆变系统，提出一种单相光伏逆变器的复合控制方法.根据单相光伏逆变器的功率平衡原理，推导出光伏逆变器的直流侧二次纹波电压的大小，由此进行校正补偿消除逆变器输出的三次谐波电流.光伏单相并网逆变器的前馈基波调制信号可由其稳态数学模型得出，从而进行输出电流快速前馈控制，然后利用无差拍控制器来实现输出电流的闭环控制，从而形成了前馈+反馈的复合控制方法，可以实现单相逆变器输出电流的快速、无差跟踪.实验和仿真结果表明了本文所提出的复合控制方法能够提高光伏并网逆变器的工作性能，并改善微网的电能质量.

Hybrid Control Strategy of Photovoltaic Generation Inverter Grid-connected Operating System

A kind of micro-grid photovoltaic inverter system considering the reactive power compensation was studied, and a compound control method for photovoltaic inverter was proposed. According to the power balance principle of single-phase photovoltaic inverter, the value of dc-side second-ripple voltage was deduced. Thus, it can modify and eliminate the output third harmonic current of photovoltaic inverter. Based on the steady-state mathematical model of single-phase inverter, the feed forward fundamental modulation signal of the inverter can be calculated, and then the output current closed-loop control can be realized by using deadbeat controller. As a result, the feed forward-feedback compound control method was formed, which can achieve fast and zero-error tracking of output current. The experiment and simulation results show that the proposed compound control method can effectively improve the dynamic performance of single-phase and perfect the power quality of distribution grid.