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Method for determining new energy carrying capacity of power grid through system frequency stability constraint

A system frequency, new energy technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of cumbersome, heavy workload, and time-consuming power grid new energy carrying capacity, and achieve good frequency response characteristics, The effect of high accuracy and reduced time-consuming simulation process

Active Publication Date: 2019-03-08
STATE GRID XINJIANG ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, using PSASP (Power System Analysis Software Package, power system analysis comprehensive program) power system analysis software to simulate the frequency change after power disturbance occurs in the power system, not only need to set a lot of simulation parameters, but also the simulation process takes a long time In order to obtain the quantitative evaluation results of the new energy carrying capacity of the power grid, the workload is relatively large and cumbersome

Method used

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  • Method for determining new energy carrying capacity of power grid through system frequency stability constraint
  • Method for determining new energy carrying capacity of power grid through system frequency stability constraint
  • Method for determining new energy carrying capacity of power grid through system frequency stability constraint

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Experimental program
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Embodiment approach

[0059] (1) The power system connected to the new energy generating set has the following two system frequency characteristics:

[0060] ①In this kind of power system, the new energy generating set usually works in the maximum power tracking state, so the output power of the new energy generating set does not respond to the system frequency change.

[0061] ②In this kind of power system, the equivalent inertial time constant M of the system is changed from the equivalent inertial time constant M of the traditional generating set 传统 and the equivalent inertial time constant M of the new energy generating set 新能源 These two parts are composed; since the new energy generating set shows weak inertia or no inertia to the system, the equivalent inertial time constant M of the new energy generating set is usually taken 新能源 =0, so the equivalent inertial time constant M of the system is equal to the equivalent inertial time constant M of the traditional generating set 传统 ; When the pr...

Embodiment 1

[0099]Adopt the method provided by the present invention to determine the new energy carrying capacity of the power grid through the system frequency stability constraints to process the power system with an actual power grid total load of 33850MW in a certain area; the minimum frequency lower limit value in the system frequency stability constraints is controlled to 49.8Hz, The upper limit of the maximum frequency change rate is controlled at 0.5Hz / s. The output power and ratio of various generators in the power system are shown in Table 2:

[0100] Table 2

[0101]

[0102] The parameters of the non-reheating steam turbine unit, reheating steam turbine unit, and water turbine unit are equivalently aggregated by using the above formula 7, so as to obtain the parameters after equivalent aggregation shown in Table 3:

[0103] table 3

[0104]

[0105] Use the above formula 2 and formula 3 to calculate, so as to obtain the equivalent inertia time constant M of the tradit...

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Abstract

The invention discloses a method for determining the new energy carrying capacity of a power grid through system frequency stability constraint. The method comprises the following steps: after the power disturbance of the system, continuously changing a load proportion and an equivalent inertia time constant of a new energy generating set in the model, and performing simulation to obtain system frequency response curves under different new energy permeability, until the new energy permeability meets the following conditions at the same time: the lowest frequency of the system under the currentnew energy permeability is greater than or equal to a lower limit value of the lowest frequency in the system frequency stability constraint and is greater than the lowest frequency of the system after the current new energy permeability is increased by a predetermined percentage value, and a maximum frequency change rate of the system under the current new energy permeability is less than or equal to an upper limit value of the maximum frequency change rate in the system frequency stability constraint and is less than the maximum frequency change rate of the system after the current new energy permeability is increased by the predetermined percentage value, and calculating a product of the current new energy permeability and the total load before the power disturbance of the system, thatis, the new energy carrying capacity of the power grid. By adoption of the method disclosed by the invention, a quantitative evaluation result of the new energy carrying capacity of the power grid can be determined quickly and accurately.

Description

technical field [0001] The invention relates to the technical field of grid new energy carrying capacity, in particular to a method for determining the grid new energy carrying capacity through system frequency stability constraints. Background technique [0002] The large-scale access of new energy sources such as wind power and photovoltaics to the power grid brings challenges to the safe and stable operation of the power grid. The weak inertia or no inertia characteristics of the new energy power generation system and its maximum power tracking operation characteristics have an impact on the frequency security and stability control of the power grid. increasingly obvious. At the same time, in the construction of a large-scale UHV AC-DC transmission network, the transmission capacity of the system is huge, the probability of large-scale power disturbances has increased significantly, and the risk of low-frequency load shedding and high-frequency power cuts has increased. ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 郭小龙刘方蕾胥国毅毕天姝张锋王衡
Owner STATE GRID XINJIANG ELECTRIC POWER
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