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Multi-point access regional load inertia time constant identification method

An inertial time constant, multi-point access technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of complex load composition and scattered load distribution, and achieve the effect of improving accuracy

Pending Publication Date: 2022-01-25
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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Problems solved by technology

The load composition in the system is relatively complex. There are constant power loads dominated by induction motors, constant voltage loads dominated by lighting, and other types of loads. The load distribution is also relatively scattered, which usually only shows the comprehensive inertia effect

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  • Multi-point access regional load inertia time constant identification method
  • Multi-point access regional load inertia time constant identification method
  • Multi-point access regional load inertia time constant identification method

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Embodiment Construction

[0037] The present invention is described in further detail now in conjunction with accompanying drawing.

[0038] In order to solve the problem that it is difficult to accurately evaluate the load inertia time constant in the power system, the flow chart of the regional load inertia time constant identification method described in the present invention is as follows figure 1 As shown, firstly, the power and bus voltage-frequency curves of the single-point load grid-connected point of the disturbed system are simulated, and then the least square method is used to identify the parameters of the single-point load inertia, and according to the proposed load inertia time constant expression equation, Calculate the single-point load inertia time constant, and finally promote it to be applied to the load multi-point access system. The weighted conversion method is used to calculate the regional load comprehensive inertia time constant, which provides technical support for the compreh...

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Abstract

The invention relates to a multi-point access regional load inertia time constant identification method. The method comprises the following steps: step 1, proposing a generalized inertia of a power system based on a synchronous generator inertia expression, giving a load inertia calculation formula based on a power fluctuation and frequency change relation, and calculating an inertia time constant of a load by taking load output as a reference; step 2, for a single-point access load, adopting a load grid-connected point voltage frequency curve and a load power curve, and adopting a least square method to identify a load inertia and an inertia time constant; and step 3, referring to a multi-machine system synchronous generator comprehensive inertia time constant calculation formula, and adopting a weighted conversion method to calculate a multi-point access regional load inertia time constant. According to the method, inertia identification is carried out by adopting the least square method, the optimal function matching between the load disturbed power and the grid-connected point voltage frequency can be searched through the quadratic sum of the minimum error, and the accuracy is improved; and a regional load inertia time constant conversion method is established for a multi-point access load.

Description

technical field [0001] The invention relates to a multi-point access area load inertia time constant identification method, and relates to area load comprehensive inertia calculation and frequency stability control. Background technique [0002] The "Double Carbon" goal promotes the rapid development of renewable clean energy, and the large-scale development of wind energy, solar energy and other renewable clean energy power generation forms is an important part of my country's energy strategy adjustment and transformation of power development methods. In 2020, the proportion of wind power generation will reach 11.4%. . Compared with traditional synchronous generators, new energy sources are connected to the grid through power electronics, with lower inertia or even no inertia. In the high-ratio power electronic system, large-scale new energy and direct current transmission have gradually replaced some synchronous machines in the traditional power grid, and the inertia of th...

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/10H02J2203/20
Inventor 李强汪惟源汪成根
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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