V01．30
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电工技术学报
2015年2月
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一种提高中频逆变器外特性的
谐振控制器建模与带宽设计
翔
邓
陈轶涵 龚春英
(南京航空航天大学江苏省新能源发电与电能变换重点实验室
210016)
南京
摘要 外特性是衡量逆变器性能的重要指标，代表了逆变器输出电压受负载的影响程度，性
能优良的逆变器通常具有较硬的外特性，其空载到满载过程中输出电压的变化量较小。目前谐振
控制器法是提高双环控制逆变器系统较为可靠的方法。但是该方案应用于400Hz中频逆变器时，
会在空载或轻载下在低频段产生相移，造成相频曲线穿越一兀，同时因为中频逆变器的谐振控制器
中心频率往往接近截止频率，谐振控制器的相位移设计不当会影响系统开环传递函数的相位裕度，
造成系统的不稳定。本文通过对包含谐振控制器的三相四桥臂逆变器在全负载状态下的小信号建
模，结合经典控制理论，分析了系统相频曲线低频段穿越一兀时稳定性判断条件，提出了一套应
用于中频逆变器的谐振控制器设计依据。据此设计谐振控制器，逆变器在提高外特性的同时在全
负载范围获得了良好的稳定性能和动态性能。最后通过仿真和实验验证了理论分析的正确性。
自激振荡
小信号建模 奈氏判据
谐振控制器
关键词：三相四桥臂逆变器
中图分类号：TM614：TM76
Resonant Controller
of
Bandwith
and
Design
ofMedium
Frequency
Modeling
for
Improving
Optimization
Characteristic
Inverter
External
Chen砑向臼门
DengXiang
Gong Chunying
Generation and Power
Conversion
210016 China)
ofNewEnergy
KeyLaboratory
(Jiangsu
andAstronautics
ofAeronautics
Nanjing
University
Nanjing
that
for inverter
is an
index
important
represent
External characteristic
performance．It
Abstract
inverter which has excellent
characteristic of
little when load
effects of the load．External
of inverter
the
output
by
to full·
increase from
empty
is
voltage changes
method to
Derfbrmance
strong，and output
always
of inverter· But
external characteristic
controller is efficient
Until now resonant
improve
lead to
will
in 400Hz medium
inverter，it
frequency
phase frequency
of resonant
frequency
resonant controller
after
using
pass
centre
shift
low
influence．Considering
curve
frequency phase
of
through一兀by
will cause inverter
shift of resonant controller
transfer function．This
cut．off frequency
is close to
controller
inverter，phase
set
up
small
of
of
paper
with
influence
unstable bv
margin
four
system open-loop
inverter
phase
in full
working
load，combines
principle
of three
phase
bridge
of
signal modeling
automatic
when
curve
passes th。0ugn
condition
phase frequency
stability
control，analyze judgement
inverter
inverter．The
controller used in medium
of resonant
and
steady
frequency
offer
一兀，and
design
principle
resonant controller
state
design
usmg
excellent
performance by
gain
performance
dynamic
theoretical
is correct·
analysis
results
and
proved
experiment
principle．Simulation
modeling，Nye’s
controller，small signal
four
inverter，resonant
leg
bridge
Keywords：Three
oscillation
criterion，self excited
改稿日期2013—04—07
收稿日期2012．12．10
万方数据
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