Droop control using three-phase ful

Droop control using three-phase full-bridge inverter overall system structure shown in Figure
2.1
FIG. Main power circuit is a three-phase full-bridge
Topology,
V
dc
DC input voltage, then the midpoint of the bridge arm
LC
filter,
L
c
To ensure that the inverter output is inductive and external connections
Inductance; inverter output voltage filter capacitor terminal voltage
v
o
Three-phase filter inductor current
i
L
Flows into the micro-grid inverter bus
Output current
i
o
. Loop power control system includes voltage and current bicyclic ring in two parts. Power loop controller sampling
Obtain inverter output voltage
v
o
And output current
i
o
, Calculated inverter output active power
P
And reactive power
Q
,then
according to
P-f
And
Q-V
Droop characteristic equation, the inner controller generates a reference voltage
*
o
v
; Inner loop controller uses voltage and current double
Closed-loop control, the reference voltage
*
o
v
And the output voltage feedback
v
o
After the voltage regulator loop, generating a reference current loop
*
L
i
This reference
Test and filter inductor current feedback
i
L
After current loop regulator to generate six-way
PWM
Drive signal inverter bridge arm switch
Off. As can be seen the system voltage and current double closed-loop design goal is to make a good showing inverter output voltage source external characteristics, electrical
Pressure-loop control of the inverter output voltage can quickly and accurately track the power ring generated reference voltage for a given current control further
Improve the dynamic response characteristics of the system

結果 (中文) 3:

下垂控制采用三相全桥逆变器整体系统结构图
二点一
图的主电源电路是一个三相全桥
拓扑，
v
直流
直流输入电压，然后在桥臂中点
LC
滤波器，
l
C
以确保逆变器输出是感性和外部连接
逆变器输出电压滤波电容器端电压
v
o
三相位滤波电感电流
我
l
流到微电网逆变总线
输出电流
我
o
。闭环功率控制系统包括两部分电压电流双环。功率环控制器采样
获得逆变器输出电压
v
o
输出电流
我
o
，计算逆变器输出有功功率
P
无功功率
Q
，然后
根据
P-F
和
Q-V
下垂特性方程，内部控制器产生一个参考电压
*
o
v
内回路控制器使用电压和电流双
闭环控制，参考电压
*
o
v
输出电压反馈
v
o
电压调节回路后，产生一个基准电流环
*
l
我
本文参考
测试和滤波电感电流反馈
我
l
后电流环调节器产生六种方式
PWM
驱动信号逆变桥臂开关
关闭。可以看出系统电压和电流双闭环的设计目标是要使逆变器输出电压源良好的外部特性、电气特性
电压回路控制逆变器的输出电压可以快速准确地跟踪一个给定的电流控制的功率环产生的参考电压
提高系统的动态响应特性