Commissioning measuring devices
Various embodiments of the disclosure include methods for testing measuring devices n for resources of an energy system assigned to a common measuring device. The method may include: acquiring a measurement signal P n (t) by way of each of the measuring devices n; acquiring a sum signal P PCC (t) by way of the common measuring device; providing an objective function Z, which defines a difference between the acquired sum signal P PCC (t) and a modeled sum signal {circumflex over (P)} PCC (t), wherein the modeled sum signal {circumflex over (P)} PCC (t) is formed by way of the acquired measurement signals P n (t) and a respective scaling factor S n ; and computing the values of the scaling factors S n by extremizing the objective function Z. The test includes determining an error with one of the measuring devices n through a deviation of the computed value of the associated scaling factor S n from a value defined for the respective measuring device n.
1 . A method for commissioning an energy system with multiple resources including multimodal generators, storage units, loads, and one or more measuring devices n assigned to the multiple resources and assigned to a common measuring device, the method comprising:
acquiring a measurement signal P n (t) by way of each of the measuring devices n;
acquiring a sum signal P PCC (t) by way of the common measuring device;
providing an objective function Z, which defines a difference between the acquired sum signal P PCC (t) and a modeled sum signal {circumflex over (P)} PCC (t), wherein the modeled sum signal {circumflex over (P)} PCC (t) is formed by way of the acquired measurement signals P n (t) and a respective scaling factor S n ;
computing the values of the scaling factors S n by extremizing the objective function Z; and
using the computed values of the scaling factors S n to set one or more operating parameters and/or one or more installation parameters for each of the one or more measuring devices n during commissioning of the energy system;
wherein the test includes determining an error with one of the measuring devices n through a deviation of the computed value of the associated scaling factor S n from a value defined for the respective measuring device n.
2 . The method as claimed in claim 1 , wherein the modeled sum signal is determined according to {circumflex over (P)} PCC (t)=Σ n S n ·P n (t).
3 . The method as claimed in claim 1 , wherein the scaling factor S n for each of the measuring devices n has a value from a set {ƒ(k)} k∈k of operating parameters of the measuring device n, which set is associated with the respective measuring device n.
4 . The method as claimed in claim 3 , wherein the set {ƒ(k)} k∈k comprises one or more permutations of mathematical signs and unit prefixes of the measurement signal P n (t) from the respective measuring device n.
5 . The method as claimed in claim 4 , wherein the set {ƒ(k)} k∈k comprises at least the unit prefixes −1, −10 3 and −10 6 as well as 1, 10 3 and 10 6 .
6 . The method as claimed in claim 3 , wherein the set {ƒ(k)} k∈k comprises one or more current transformer factors and/or one or more specific thermal capacities.
7 . The method as claimed in claim 3 , wherein:
the scaling factor S n associated with one of the measuring devices n ( 42 ) is formed by S n =Σ k∈k x n (k)·ƒ(k); and
x n (k) is a Boolean selection function that assigns each measuring device n ( 42 ) exactly one value ƒ(k) from the set {ƒ(k)} k∈k associated with the measuring device n ( 42 ).
8 . The method as claimed in claim 7 , wherein the objective function is extremized using the constraint
Σ k∈K x n ( k )=1, with x n ( k )∈{0,1}.
9 . The method as claimed in claim 7 , wherein the selection functions x n (k) for all measuring devices n ( 42 ) are defined by the extremizing of the objective function Z.
10 . The method as claimed in claim 1 , wherein Z=Σ t∈T |P PCC (t)−P PCC (t)| is used as the objective function.
11 . The method as claimed in claim 10 , wherein the absolute value of the difference |P PCC (t)−{circumflex over (P)} PCC (t)| is formed by way of two positive error variables e PCC ± (t)≥0 through e PCC + (t)+e PCC − (t), wherein P PCC (t)−{circumflex over (P)} PCC (t)=e PCC + (t)−e PCC − (t).
12 . The method as claimed in claim 1 , wherein an electricity meter or a heat meter is used in each case as measuring device n ( 42 ), wherein the measurement signals P n (t) are formed by time characteristics of the respective powers.