US 11,990,756 B2
Long, short and multi-timescale voltage regulation method based on source-grid-load- storage multi-terminal collaboration of power distribution network
Dong Yue, Jiangsu (CN); Chunxia Dou, Jiangsu (CN); Zhijun Zhang, Jiangsu (CN); Xiaohua Ding, Jiangsu (CN); Jianbo Luo, Jiangsu (CN); Yanman Li, Jiangsu (CN); Kun Huang, Jiangsu (CN); and Tao Han, Jiangsu (CN)
Assigned to NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS, Nanjing (CN); and STATE GRID ELECTRIC POWER RESEARCH INSTITUTE CO. LTD, Nanjing (CN)
Appl. No. 17/998,039
Filed by NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS, Jiangsu (CN); and STATE GRID ELECTRIC POWER RESEARCH INSTITUTE CO. LTD, Jiangsu (CN)
PCT Filed Jan. 5, 2022, PCT No. PCT/CN2022/070193
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2023/000624, PCT Pub. Date Jan. 26, 2023.
Claims priority of application No. 202110833753.0 (CN), filed on Jul. 23, 2021.
Prior Publication US 2023/0387691 A1, Nov. 30, 2023
Int. Cl. H02J 3/28 (2006.01)
CPC H02J 3/28 (2013.01) [H02J 2203/20 (2020.01)] 9 Claims
OG exemplary drawing
 
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

OG Complex Work Unit Math
ETSC(Ti)=S(t−t0)−S(t−t0−ΔTi), iϵ{1,2, . . . n−1}  (2)
if t=t0 and Vrm(t) rises to

OG Complex Work Unit Math
ETSC(Ti)=S(t−t0)−S(t−t0−ΔTn−2+i), iϵ{2,3, . . . n−1}  (3)
formula (2) indicates that the discrete transition Ti, i=1,2,n−1 is triggered when Vrm(t) falls to a lower threshold

OG Complex Work Unit Math
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

OG Complex Work Unit Math
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:

OG Complex Work Unit Math
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:

OG Complex Work Unit Math
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.