公开(公告)号：US20200220361A1

公开(公告)日：2020-07-09

申请号：US16627363

申请日：2018-10-17

Applicant: SOUTHEAST UNIVERSITY

Inventor： Huafeng XIAO ,  Zheng WANG ,  Ming CHENG

IPC: H02J3/46 ,  H02J13/00 ,  H02M7/49

Abstract: A grid access current control method without current sensor applicable to a grid-connected inverter relates to a system including a main circuit of the grid-connected inverter and a control circuit of the grid-connected inverter. The control circuit of the grid-connected inverter includes a grid access current open-loop control module and a PWM generation module; the grid access current open-loop control module includes a first proportional regulator, a second proportional regulator, a delayer, and an adder; input ends of the first proportional regulator and the second proportional regulator each are led out as an input end of a grid access current reference signal; and an output end of the first proportional regulator is connected to an input end of the adder; an output end of the second proportional regulator is connected to an input end of the delayer.

公开(公告)号：US20250150004A1

公开(公告)日：2025-05-08

申请号：US19017286

申请日：2025-01-10

Applicant: SOUTHEAST UNIVERSITY

Inventor： Huafeng XIAO ,  Xu WU

IPC: H02M7/5387 ,  G01R29/12 ,  H02M1/12 ,  H02M7/483

Abstract: Disclosed is a direct control method and system for an internal potential of a bridge arm of a new energy grid-tied inverter (GTI), the control method including the following steps. Measured values are obtained by measuring a port voltage and a port current of a GTI, instantaneous active and reactive power values are calculated, and a phase angle and amplitude reference of an internal potential of a bridge arm are obtained to generate reference values thereof. The internal potential of the bridge arm is estimated, and an estimated value used as a feedback signal, after being compared with the reference values, is sent to an internal potential controller to obtain a modulating signal, which is sent to a pulse width modulation (PWM) module, realizing direct control of the internal potential of the bridge arm. In the present disclosure, the dynamic performance of the GTI is improved while improving power quality.