CPC H02J 3/28 (2013.01) [H02J 2203/20 (2020.01)] | 9 Claims |
1. A long-timescale voltage regulation method based on source-grid-load-storage multi-terminal collaboration of a power distribution network, comprising:
acquiring a multi-mode switching control model based on voltage security event trigger of feeders of an active power distribution network; and
establishing multi-objective optimization taking into account a source-storage-load regulation cost and a network transmission loss in each operating mode according to the multi-mode switching control model based on voltage security event trigger, to obtain optimal power values of a source terminal, a load terminal and a storage terminal over a long timescale;
wherein a construction process of the multi-mode switching control model based on voltage security event trigger comprises:
establishing the multi-mode switching control model, which is composed of a septimal tuple (P, T, A, F−, F+, TM, M0), of the feeders of the active power distribution network based on a Petri network, where:
P={P1, P2, . . . , Pn},
T={T1, T2, . . . , T2n−2},
A=(P⊗T)∪(T⊗P),
TM={ΔT1, ΔT2, . . . , ΔT2n−2} (1)
in formula (1), P is a set of discrete places, and Pi, iϵ{1,2, . . . n} is discrete places and represents operating modes of the active power distribution network; n is a total number of voltage regulator taps; T is a set of all discrete transitions; A is a set of all arcs, the modes are connected to the corresponding transitions through the directed arcs in A, and these directed arcs are associated with predecessor arcs defined in F− or successor arcs defined in F+ respectively, and ⊗ is a Cartesian product; F− is a set of the predecessor arcs; F+ is a set of the successor arcs; TM represents a set of discrete transition switching times; M0 represents a set of all initial mode marks;
the discrete transition Ti, iϵ{1,2,2n−2} is triggered by a voltage security event designed as follows:
if t=t0 and Vrm(t) falls to
![]() if t=t0 and Vrm(t) rises to
![]() formula (2) indicates that the discrete transition Ti, i=1,2,n−1 is triggered when Vrm(t) falls to a lower threshold
![]() and DTi time later, the operating mode is switched from Pi to Pi+1; formula (3) indicates that Tn−2+i, i=2,3,L n is triggered when Vrm(t) rises to an upper threshold
![]() time later, the operating mode is switched from Pi to Pi−1; where, ETSC(Ti) is a trigger function of the discrete transition Ti, Vref a voltage reference value, Vdb is a voltage error dead zone, and Vrm(t) is a moving average of a secondary voltage of a voltage regulator, which is specifically expressed as:
![]() in formula (4), N is a length of a sliding time window, V(τ) is the secondary voltage of the voltage regulator at a time τ, and t represents a present time; in formula (2) and formula (3), a step function S(t−t0) is expressed as:
![]() in formula (5), t represents a present time, and t0 represents a certain time.
wherein the method further comprises:
controlling the source terminal, the load terminal, and the storage terminal to reach to the respective optimal power values of the source terminal, the load terminal, and the storage terminal.
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