Power system time sequence simulation method and system based on linear power flow

A technology of power system and power flow equation, which is applied to AC network circuits, circuit devices, and AC networks with the same frequency from different sources, etc. It can solve the problems of low calculation efficiency, do not calculate the power flow distribution and state of the power grid, and achieve accuracy High effect with short simulation time

Pending Publication Date: 2021-10-08
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
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  • Application Information

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Problems solved by technology

Time-series production simulation needs to perform time-series simulation on the long-term power system operating state, and the power flow equation is a nonlinear equation. It often needs to solve the power flow distribution of voltage and power through iterative methods. In the long-term scale of large-scale power systems Calculation efficiency is low in timing simulation, and most of the existing research does not calculate power flow distribution and state

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  • Power system time sequence simulation method and system based on linear power flow
  • Power system time sequence simulation method and system based on linear power flow
  • Power system time sequence simulation method and system based on linear power flow

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Embodiment 1

[0066] The invention provides a power system timing simulation method based on linear power flow, which can calculate state variables such as voltage and branch power during the timing simulation process, and meanwhile has short simulation time and high accuracy.

[0067] In this embodiment, firstly, the power flow equation of the power system based on branch power representation is established;

[0068] Secondly, the linear power flow equation is established for the decoupling of the voltage amplitude and phase angle in the branch power flow equation of the power system;

[0069] Then, establish the power system long-term scale simulation database;

[0070] After the linear power flow equation and the long-term scale simulation database of the power system are established, each time the time series simulation of the power system based on the linear power flow can be performed as follows: figure 1 The simulation operation shown specifically includes:

[0071] Step 1: Obtain ...

Embodiment 2

[0105] In order to verify the effectiveness of the simulation method of the present invention, the IEEE 30, 118 and 300 node standard calculation examples are used for testing, and key state variables such as node voltage, phase angle, branch transmission active and reactive power are analyzed, and based on the Newton-Raphson method The exact power flow results obtained from the solution are compared.

[0106] From Figure 3(a) IEEE 30Bus test system voltage distribution calculation results, Figure 3(b) IEEE 30Bus test system phase angle calculation results, Figure 3(c) IEEE 30Bus test system branch active power calculation results and Figure 3(d) IEEE 30Bus test system branch reactive power calculation results, it can be seen that the values ​​of all state variables of IEEE 30 nodes obtained based on the linear power flow model proposed by the present invention are almost consistent with the accurate power flow results, and the errors are negligible;

[0107] From Figure 4(a) ...

Embodiment 3

[0123] Based on the same inventive concept, this embodiment provides a power system timing simulation system based on linear power flow, such as Figure 8 As shown, the system includes:

[0124] An acquisition module, configured to acquire power grid parameter simulation data of the power system;

[0125] The simulation module is used to perform power flow simulation on the power system based on the power grid parameter simulation data of the power system and the linear power flow equation of the power system in advance, and obtain the node voltage and branch power of each time section of the power system;

[0126] Wherein, the linear power flow equation of the power system is obtained by decoupling and linearizing the voltage amplitude and phase angle in the power flow equation of the power system.

[0127] Specifically, the establishment of the linear power flow equation of the power system includes:

[0128] Obtaining the power flow equation of the power system, the power...

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Abstract

The invention relates to a power system time sequence simulation method and system based on linear power flow. The method comprises the following steps: obtaining power grid parameter simulation data of a power system; and performing power flow simulation on the power system based on the power grid parameter simulation data of the power system and a pre-established linear power flow equation of the power system to obtain node voltage and branch power of each time section of the power system. According to the technical scheme provided by the invention, the state quantities such as voltage and branch power can be calculated in the time sequence simulation process, and meanwhile, the simulation time is short and the accuracy is high.

Description

technical field [0001] The invention relates to the field of transmission network planning, in particular to a method and system for timing simulation of a power system based on a linear power flow. Background technique [0002] With the shortage of traditional fossil energy and global concern about environmental issues, it has become a broad consensus in the energy field to actively increase the proportion of clean energy in the energy structure. From 2009 to 2018, the proportion of renewable energy installed capacity has increased significantly. At the same time, renewable energy power generation technology mainly based on wind power and photovoltaic power generation has become a research hotspot in recent years, and the impact of renewable energy power generation on the power system The impact of renewable energy is gradually reflected, and even the problem of insufficient capacity of the power system to absorb renewable energy has emerged. [0003] At present, in order ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 董昱董存范高锋于若英丁杰朱凌志陈宁王湘艳赵亮彭佩佩吴福保许晓慧夏俊荣陈文进彭琰赵欣
Owner CHINA ELECTRIC POWER RES INST
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