Functional Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 324

(a)

Scope1

In1 Out1 In1 Out1

Signal
Generator

var1.mat

PI Regulator PWM-Subsystem

To File

Heterogeneous controller

(b)

Threshold = 1.6

1
Out1

Switch

1
In1

Switch on point: 0.01
Switch off point: -0.01
Output when on: 0
Output when off: 1.6

1
0.3s+1
Transfer Fcn Subtract Relay

Amplitude:1.6/2
Frequency: 1/1800

Signal
Generator

Scope4

var2.mat

0.8

To File

Constant

Fig. 91 Structure of a PI heterogeneous controller: a block scheme of PI controller; b PWM
subsystem

A potential solution for improving the performance of the battery voltage control
loop is the use of an additional anticipatory control, depending on the power con-
sumed in the system, according to the principle scheme from Fig. 93 . The controlled
process is made up of Stirling engine and the electric subsystem of the battery (SM),
plus the proper battery (B). The disturbance variable which affects the battery is the
power P, consumed in the whole electric subsystem. If the consumed power is
measured at the level of the monitoring system, then a feed-forward control may
easily be achieved, through the anticipation controller, AC. In this case, the control
received by the Stirling engine, u cS , has two components: the control of the voltage
controller — VC, u f c , and the anticipative control, u f c

. Regarding the balance of the