Quick-response voltage control method of distribution system considering multiple participants

Patent metadata

Field	Value
Publication number	US-11695299-B2
Application number	US-202017061505-A
Country	US
Kind code	B2
Filing date	Oct 1, 2020
Priority date	Oct 1, 2020
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

The present invention relates to a quick-response voltage control method of distribution systems considering multiple participants, comprising a multiple agent system (MAS), which collects the local information of the distribution system controlled by each agent and interacts with the local information collected by each agent, so that voltage-power sensitivity of the distribution system, used for providing the theoretical basis for voltage regulation, is calculated by distributed calculation; and multiple participants, which establish incentive mechanism by DSOs based on the bidding game with imperfect information, and independently decide their own strategies to obtain the voltage regulation subsidy from the DSOs, according to the calculated voltage-power sensitivities, thus provide voltage support for the distribution system in the process of pursuing benefit maximization.

First claim

What is claimed is:

1. A method of controlling voltages of power distribution networks (DNs) considering multiple agents, comprising:
a multiple agent system (MAS), which collects local information of the power distribution networks controlled by each agent of the multiple agents and interacts with the local information collected by each agent, so that voltage-power sensitivity of the power distribution networks, used for providing the theoretical basis for voltage regulation, is calculated by distributed calculation, wherein the local information comprises Voltage V n of Node n, injected active power P n and injected reactive power Q n of Node n, active power P to.n and reactive power Q to,n of Node n flow from the upstream branch, and the branch resistances R n and reactance X n between Node n−1 and Node n; and
the multiple agents, which establish incentive mechanism by distribution system operators (DSOs) based on bidding game with imperfect information, and independently decide their own strategies to obtain the voltage regulation subsidy from the DSOs, according to the calculated voltage-power sensitivities, thus providing voltage support for the power distribution networks in the process of pursuing benefit maximization;
wherein the multiple agents comprise microgrids (MGs) and each of the MGs comprising distributed generation (DG) units, loads, energy storage systems, and monitoring systems;
the method of controlling voltages of DNs comprises the following steps:
1) Collecting local information of the power distribution networks by each agent;
2) calculating the voltage-power sensitivities of the radial DN by MAS;
3) establish the incentive mechanism by the DSO;
4) establish strategies by the MGs based on bidding games with imperfect information;

wherein the Step 4) includes:
for MGi, when a voltage excursion occurs, the MAS obtains the voltage-power sensitivity required in the current-voltage regulation process, and sends the voltage-power sensitivity, the nodes with voltage violation and their voltage magnitudes to the MG Agents at all MGs participating in the current-voltage regulation; then, all agents of the MG carry out game bidding: firstly, the i-th MG agent determines the current cost function, and according to the voltage-power sensitivity, the nodes with voltage violation and their voltage magnitudes to maximize its interests, the objective function is:
Max{π MGi (Δ P MGi )− C MGi (Δ P MGi )}  (12)

wherein π MGi (ΔP MGi ) and C MGi (ΔP MGi ) denote the reward and cost of MGi in the voltage regulation process respectively;
the MGi agent makes a decision ΔP MGi and reports it to all agents of MG; then according to the strategies of other MG agents, the MGi agent updates its own strategy using the relaxation algorithm and makes the decision and reports it to all agents of MG again; all the MG Agents repeat the process of game bidding of the i-th MG agent until all the MG agents no longer change their strategies; therefore, the power distribution networks run at the Nash equilibrium point ΔP* MG =(ΔP* MG1 , ΔP* MG2 , . . . , ΔP* MGn ) of this game bidding, for MGi, the calculation formulas are as follows:

Δ
⁢

P
MGi
*

=

arg
⁢

max

Δ
⁢

P
MGi

R
MGi

(

Δ
⁢

P

MG
⁢
1

*

,

Δ
⁢

P

MG
⁢
2

*

,
…

,

Δ
⁢

P
MGi

,
…

,

Δ
⁢

P
MGn
*

)

(
13
)

wherein R MGi (ΔP* MG1 , ΔP* MG2 , . . . , ΔP MGi , . . . , ΔP* MGn ) is the final revenue function of the i-th MG.

2. The method of controlling voltages of DNs considering multiple agents according to claim 1 , wherein the voltage-power sensitivities of the radial DN by MAS described in Step 2 is the voltage-power sensitivity between any two Nodes n and m in the radial DN, which is denoted by

∂

V
m

∂

P
n

,

wherein V m denotes the voltage at Node m, P n denotes the injected active power of Node n; the calculation method of the voltage-power sensitivity

∂

V
m

∂

P
n

is divided into the following three cases according to the relative topological positions of Nodes n and m:
a) when Node n is on the upstream of Node m, the calculation formula is as follows:

Assignees

• Univ Tianjin
• Electric Power Res Institute Of China Southern Power Grid

Inventors

• Xu Tao
• Wang Xiaoxue
• Meng He
• Yang Han
• Li Peng
• Guo Xiaobin
• Yu Li
• Xu Quan
• Liu Liqi

Classifications

• H02J13/16 Primary

  the power network being controlled at grid-level, e.g. using aggregators · CPC title

• H02J13/12

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• G06F17/11

  for solving equations {, e.g. nonlinear equations, general mathematical optimization problems (optimization specially adapted for a specific administrative, business or logistic context G06Q10/04)} · CPC title

• H02J13/00032 Primary

  Electricity · mapped topic

• G06Q50/06 Primary

  Energy or water supply · CPC title