Voltage regulation optimization
View Patent ↗A voltage regulation optimization (VRO) system receives inputs from a DCS or other distribution network control/monitoring system. The VRO then calculates optimized control commands for various network devices including the controllable taps of voltage regulating transformers.
1. A computer program product for determining optimal settings for controllable taps of voltage regulating transformers in a distribution network, comprising:
a non-transitory computer readable medium having computer readable code embedded therein, the non-transitory computer readable medium comprising:
program instructions that receive a network model and solve for unbalanced load flow to determine a set of state variables x using initial control variables u;
program instructions that calculate an overall objective value of the network under initial control variables u or a trial solution for u;
program instructions that construct a sequence of quadratic programs (QP) based on first order approximation to generate trial solutions and performs full non-linear unbalanced load flow on the trial solution to determine the actual improvement in objective function before accepting the trial solution;
program instructions that discretize the non-integer QP solution and perform systematic adjustment to identify a trial solution that produces performance improvement in non-linear unbalanced load flow simulation; and
program instructions that calculate jacobian matrix J 1 -J 9 according to the equations,
J
1
=
∂
g
∂
x
;
J
2
=
∂
g
∂
u
;
J
3
=
-
(
∂
g
∂
x
)
-
1
∂
g
∂
u
;
J
4
=
∂
v
∂
u
+
∂
v
∂
x
·
J
3
;
J
5
=
∂
i
∂
u
+
∂
i
∂
x
·
J
3
;
J
6
=
∂
v
K
d
∂
u
+
∂
v
K
d
∂
x
·
J
3
J
7
=
∂
v
K
q
∂
u
+
∂
v
K
q
∂
x
·
J
3
;
J
8
=
∂
i
K
d
∂
u
+
∂
i
K
d
∂
x
·
J
3
;
J
9
=
∂
i
K
q
∂
u
+
∂
i
K
q
∂
x
·
J
3
.
2. The computer program product according to claim 1 wherein the computer readable medium further comprises program instructions that initially generate a best control setting and associated objective value, and iteratively update the best solution and objective until none can be found.
3. The computer program product according to claim 1 wherein the computer readable medium further comprises program instructions that build said quadratic problem using said J 1 -J 9 .
4. The computer program product according to claim 3 wherein the computer readable medium further comprises program instructions that check for convergence, wherein if convergence is determined, the best control set is output and if not converged, the program returns to said step of calculating jacobian matrix J 1 -J 9 and constructing new QP and proposing trail correction to the control variables by solving the QP.
5. A method for determining optimal settings for controllable taps of voltage regulating transformers in a distribution network, comprising:
receiving a network model and solve for unbalanced load flow to determine a set of state variables x using initial control variables u;
calculating an overall objective value of the network under initial control variables u or a trial solution for u;
constructing a sequence of quadratic programs (QP) based on first order approximation to generate trial solutions and performs full non-linear unbalanced load flow on the trial solution to determine the actual improvement in objective function before accepting the trial solution;
discretizing the non-integer QP solution and perform systematic adjustment to identify a trial solution that produces performance improvement in non-linear unbalanced load flow simulation;
initially generating a best control setting and associated objective value, and iteratively updating the best solution and objective value;
outputting said best control setting to a distribution control system; and
calculating jacobian matrix J 1 -J 9 according to the equations,
J
1
=
∂
g
∂
x
;
J
2
=
∂
g
∂
u
;
J
3
=
-
(
∂
g
∂
x
)
-
1
∂
g
∂
u
;
J
4
=
∂
v
∂
u
+
∂
v
∂
x
·
J
3
;
J
5
=
∂
i
∂
u
+
∂
i
∂
x
·
J
3
;
J
6
=
∂
v
K
d
∂
u
+
∂
v
K
d
∂
x
·
J
3
J
7
=
∂
v
K
q
∂
u
+
∂
v
K
q
∂
x
·
J
3
;
J
8
=
∂
i
K
d
∂
u
+
∂
i
K
d
∂
x
·
J
3
;
J
9
=
∂
i
K
q
∂
u
+
∂
i
K
q
∂
x
·
J
3
.
6. The method according to claim 5 wherein the method further includes building said quadratic problem using said J 1 -J 9 .
7. The method according to claim 5 wherein the method further includes checking for convergence, wherein if convergence is determined, the best control set is output and if not converged, the program returns to said step of calculating jacobian matrix J 1 -J 9 and constructing new QP and proposing trail correction to the control variables by solving the QP.
8. A computer program product for determining optimal settings for controllable taps of voltage regulating transformers in a distribution network, comprising: a non-transitory computer readable medium having computer readable code embedded therein, the non-transitory computer readable medium comprising:
(a) program instructions that receive a network model and solve for unbalanced load flow to determine a set of state variables x using initial control variables u;
(b) program instructions that calculate an overall objective value of the network under initial control variables u or a trial solution for u;
(c) program instructions that construct a sequence of quadratic programs (QP) based on first order approximation to generate trial solutions;
(d) program instructions that perform full non-linear unbalanced load flow on the trial solution to determine the actual improvement in objective function before accepting the trial solution;
(e) program instructions that discretize the non-integer QP solution and perform systematic adjustment to identify a trial solution that produces performance improvement in non-linear unbalanced load flow simulation; and
(f) program instructions that calculate jacobian matrix J 1 -J 9 according to the equations,
J
1
=
∂
g
∂
x
;
J
2
=
∂
g
∂
u
;
J
3
=
-
(
∂
g
∂
x
)
-
1
∂
g
∂
u
;
J
4
=
∂
v
∂
u
+
∂
v
∂
x
·
J
3
;
J
5
=
∂
i
∂
u
+
∂
i
∂
x
·
J
3
;
J
6
=
∂
v
K
d
∂
u
+
∂
v
K
d
∂
x
·
J
3
J
7
=
∂
v
K
q
∂
u
+
∂
v
K
q
∂
x
·
J
3
;
J
8
=
∂
i
K
d
∂
u
+
∂
i
K
d
∂
x
·
J
3
;
J
9
=
∂
i
K
q
∂
u
+
∂
i
K
q
∂
x
·
J
3
.