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Linear power flow model base construction method based on state space transformation and quick response method thereof

A technology of power flow model and state space, which is applied to the direction of AC network with the same frequency from different sources, AC network circuit, AC network voltage adjustment, etc., and can solve the problems of low accuracy of DC power flow model and unfavorable power system economy, etc.

Pending Publication Date: 2020-11-03
STATE GRID CHONGQING ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the accuracy of the DC power flow model is low, which is not conducive to the economical operation of the power system.

Method used

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  • Linear power flow model base construction method based on state space transformation and quick response method thereof
  • Linear power flow model base construction method based on state space transformation and quick response method thereof
  • Linear power flow model base construction method based on state space transformation and quick response method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] A method for constructing a linear power flow model library based on state space transformation, including the following steps:

[0105] 1) Set independent variables and perform state space transformation on independent variables.

[0106] The independent variables include node voltage amplitude v and phase difference θ ij .

[0107] The node voltage amplitude is transformed into where k i is the undetermined decision variable. is the node voltage amplitude state variable. k of each node i Different, not limited to integers.

[0108] The voltage phase difference remains unchanged, that is, φ(θ ij ) = θ ij . φ(θ ij ) is the phase difference state variable.

[0109] 2) Establish a general linear power flow model library.

[0110] The steps to build a general linear power flow model library are as follows:

[0111] 2.1) To establish a general linear active power flow equation, the steps are as follows:

[0112] 2.1.1) Establish the active power flow equatio...

Embodiment 2

[0195] The rapid response method of the linear power flow model library construction method based on the state space transformation includes the following steps:

[0196] 1) When the power system is running online, obtain the load fluctuation under operation. Currently calling the linear power flow model library {Ω 1 ,Ω 2 ,...,Ω N}.

[0197] 2) Combine the load fluctuation under the current operation with the linear power flow model library {Ω 1 ,Ω 2 ,...,Ω N}, and compare the load fluctuations corresponding to each model in the current operation, select a set of linear power flow models with the smallest difference with the load fluctuations under the current operation, and apply the selected linear power flow models to the current operating state.

Embodiment 3

[0199] see figure 1 , a method for building a linear power flow model library based on state-space transformation and an experiment on its fast response strategy, mainly includes the following steps:

[0200] 1) Establish an IEEE 30-node test system, including 6 generators, and loads exist at 20 nodes.

[0201] 2) Set 40 historical scenarios, and set the node load power fluctuation of each scenario, the fluctuation range is 0-±10%.

[0202] 3) Use the AC power flow model to calculate the optimal power flow, and obtain the branch transmission power P in each scenario ij and Q ij , the node voltage amplitude and v i Phase difference θ ij .

[0203] 4) Optimize and solve the optimal linear power flow model

[0204] Firstly, the known state variables are substituted into the expression of the general linear power flow model, and the branch linear power flow equation expression P of each branch in each historical scene is obtained ij,L and Q ij,L As follows.

[0205]

...

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Abstract

The invention discloses a linear power flow model library construction method based on state space transformation and a quick response method thereof; the method comprises the steps: 1) setting an independent variable, and carrying out the state space transformation of the independent variable; 2) establishing a general linear power flow model library. The response method comprises the following steps: comparing the load fluctuation under the current operation with the load fluctuation corresponding to each model in the linear power flow model library, selecting a group of linear power flow models with the minimum difference value with the load fluctuation under the current operation, and applying the selected linear power flow models to the current operation state. On the premise of statespace transformation, a general linear power flow model with smaller errors is provided and a linear power flow model library is established, so that errors caused by linearization are effectively reduced after a quick response method is applied, and good robustness is achieved.

Description

technical field [0001] The invention relates to the field of linearization of power system power flow equations, in particular to a method for constructing a linear power flow model library based on state space transformation and a fast response method thereof. Background technique [0002] With the continuous development of the power industry, the significance of power system analysis in power grid operation, control and dispatch is becoming more and more important. Conventional calculations of power systems mainly include power flow calculations and optimal power flow (OPF) calculations, both of which use AC models. Based on Ohm's and Kirchhoff's laws, the power flow equation models active power (P) and reactive power (Q) as nonlinear functions of voltage magnitude (v) and voltage phase angle (θ). However, due to the nonlinear characteristics of the AC model, the nonlinearity of the power flow equation will cause the optimization problem to be non-convex, and its difficul...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/06H02J3/12
CPCH02J3/00H02J3/06H02J3/12H02J2203/10H02J2203/20
Inventor 金黎明吴迎霞张同尊刘育明张林赵科蒋望杨知方龙嘉锐余娟樊哲新姜华
Owner STATE GRID CHONGQING ELECTRIC POWER
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