Three Phase IGBT Inverter in PSPICE Problem

Hi all. That's my first post on your 4um, so please be placable. I've got a problem with my project of three phase voltage inverter in PSPICE (text mode).My task is to create model (of inverter) with PI regulator (made of resistor,capacitor and Zener Diode), which will stabilize output voltage (by changing "dead time" of IGBT's) in time periods:
0<t<1s - Vout = 200V
1s<t<2s - Vout = 100V
t>2s - Vout=200V

Inverter is feeding by 500V DC source and it's loaded by star connected RL receiver - R=8 Ohm, L=15mH, f0 = 50Hz.

Till now, I wrote model of inverter and a PI regulator separately and it works fine. My problem is, that I don't know how to connect this two pieces to get my result . Can you have a look at my problem ?
Code of my program:

THREE PHASE INVERTER

.PARAM Uz=500
.PARAM Rz=100m
.PARAM CDC=100u
ID 15 13
.PARAM Ugmin=-15
.PARAM Ugmax=15
.PARAM fpi=1k
.PARAM Am=0.98
.PARAM fo=50

.PARAM Iom=10
.PARAM del_i=1

.PARAM Ro=8
.PARAM Lo=15m


* Parameters 2
* -----------------------------
.PARAM omo={2*pi*fo}
.PARAM fio={2*pi/3}
.PARAM pi=3.1415926535898

*-------------------------------------------------------------------------

.TRAN 10u 40m 0 10u UIC
.FOUR 50 100 V(4,5) V(4) I(Ro1)
.OPTIONS itl4=200 reltol=0.03

* Plots
* -------------------------
.PROBE V(100) V(101) V(102) V(103) V(104) V(105) V(106) V(4) V(5) V(6) V(16,14) V(13,14)
+ I(Rzas) I(VDC) I(Ro1) I(Ro2) I(Ro3) V(17,4) I(Sp1) I(Dzp1)

*---------------------------------------------------------------------------
.MODEL IGBT VSWITCH ROFF=1k RON=100u VOFF={Ugmin} VON={Ugmax}
.MODEL diode D BV=2k RS=2m
*---------------------------------------------------------------------------
* SUPPLY
* ---------
Vzas 16 14 {Uz}
Rzas 16 15 {Rz}
Dzas 15 13 dioda

CDC 13 14 {CDC} IC={Uz}
VDC 13 17

* Control
* ----------------------------------------
VUz 300 0 pwl( 0 {Am}
+ 0.6 {Am}
+ 1.6 {Am}
+ 2.2 {Am} )

Ifz 0 301 pwl( 0 {fo/50}
+ 0.6 {fo/50}
+ 1.6 {fo/50}
+ 2.2 {fo/50} )

Cfz 301 0 {1/(2*pi)}
Rfz 301 0 1e12

Vfi 100 0 pulse( -1 1 {0} {(0.5-0.5m)/fpi} {(0.5-0.5m)/fpi} {1m/fpi} {1/fpi} )

Eo1 101 0 VALUE {V(300)*sin(fo*V(301))}
Eo2 102 0 VALUE {V(300)*sin(fo*V(301)-fio)}
Eo3 103 0 VALUE {V(300)*sin(fo*V(301)+fio)}

Em1 104 0 VALUE {Ugmax*sgn(Iom*sin(omo*TIME)-I(Vo1)+del_i*V(104)/Ugmax)}
Em2 105 0 VALUE {Ugmax*sgn(Iom*sin(omo*TIME-fio)-I(Vo2)+del_i*V(105)/Ugmax)}
Em3 106 0 VALUE {Ugmax*sgn(Iom*sin(omo*TIME+fio)-I(Vo3)+del_i*V(106)/Ugmax)}

* Inverter model
* ----------------------
Sp1 17 7 104 0 IGBT
Sp2 17 9 105 0 IGBT
Sp3 17 11 106 0 IGBT
Sp4 4 8 0 104 IGBT
Sp5 5 10 0 105 IGBT
Sp6 6 12 0 106 IGBT

Dp1 7 4 diode
Dp2 9 5 diode
Dp3 11 6 diode
Dp4 8 14 diode
Dp5 10 14 diode
Dp6 12 14 diode

Dzp1 4 17 diode
Dzp2 5 17 diode
Dzp3 6 17 diode
Dzp4 14 4 diode
Dzp5 14 5 diode
Dzp6 14 6 diode

* RL Receiver
* ------------
Vo1 1 0
Vo2 2 0
Vo3 3 0

Ro1 31 1 {Ro}
Ro2 32 2 {Ro}
Ro3 33 3 {Ro}

Lo1 4 31 {Lo}
Lo2 5 32 {Lo}
Lo3 6 33 {Lo}
.END


PI regulator:

Regulator pi

.PARAM Kp=0.000001
.PARAM Ti=0.5

.TRAN 1m 1 0 1m UIC
.PROBE

.MODEL zener D BV=100

Ieps 0 1 pwl( 0 0
+ 0.2 0
+ 0.201 100 )

* ------------------------
Rp 1 2 {Kp}
Ci 2 0 {Ti}
Dza 0 1 zener
.END