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Online quantization evaluation method of transient state stability of power grid based on WAMS (wide area measurement system) and unit pair

A technology for grid transient stability and quantitative assessment, applied in the direction of single grid parallel feeding arrangement, etc., can solve irrationality, can not achieve effective online monitoring and early warning amount of grid transient stability, conservative or optimistic can not be assessed, etc. question

Active Publication Date: 2012-10-03
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

The maximum relative power angle early warning threshold set by experience is quite unreasonable, and its conservative or optimistic nature cannot be evaluated, and it is impossible to achieve online effective monitoring of power grid transient stability and the effect of early warning amount

Method used

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  • Online quantization evaluation method of transient state stability of power grid based on WAMS (wide area measurement system) and unit pair
  • Online quantization evaluation method of transient state stability of power grid based on WAMS (wide area measurement system) and unit pair
  • Online quantization evaluation method of transient state stability of power grid based on WAMS (wide area measurement system) and unit pair

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Embodiment Construction

[0068] An online quantitative evaluation method for power grid transient stability based on WAMS and unit pairs adopts the following technical solutions:

[0069] Step 1: The WAMS system monitors the operating status of the power grid in real time. Once a generator set operating status (generator terminal bus voltage or electromagnetic output power) or node voltage has a large change in the power grid, and lasts for more than a certain period of time, it will start a transient state Stabilize the online quantitative evaluation procedure;

[0070] Step 2: According to all the generator angular velocity ω, power angle δ, phase angle θ of the bus voltage at the machine end, and electromagnetic active power P at the machine end collected by the WAMS system E , the kinetic energy ND of each generator can be calculated separately. The kinetic energy calculation formula is: where M is the generator inertia time constant;

[0071] Step 3: According to ND, δ, θ and Size, sort all...

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Abstract

The invention provides an online practical quantization evaluation method of transient state stability of a power grid based on a WAMS (wide area measurement system) and a unit pair and belongs to the technical fields of online monitoring and early warning safety and stability of the power grid based on the WAMS. The method comprises the steps of: screening a generator set omega of which the power grid is distributed most severely relatively based on the wide-area measurement information of the WAMS, wherein setting any two generators within omega equivalent to a stand-alone system; and constructing a dynamic relative transient stability margin index (DTSI) on the basis, wherein the DTSI of the smallest unit pair is taken as the DTSI of the power grid. According to the invention, response track information is actually measured based on the power grid, and a dynamic relative idea is adopted. The method is suitable for any complicated model or transition mode of the power grid; the information can be effectively measured by fully utilizing a PMU (power management unit); the problems of coherent generator identification, curve fitting and energy integral hypothesis path and the like are avoided, and the method is less in calculated amount and high in reliability, and is expected to be applied to online safety monitoring and early warning engineering of the power grid based on the WAMS.

Description

technical field [0001] The invention belongs to the field of real-time monitoring and early warning of safe operation of a power grid based on a wide area measurement system (WAMS), and in particular relates to an online quantitative evaluation method for power grid transient stability based on a WAMS and a unit pair. Background technique [0002] Power grid transient stability is one of the main problems affecting the safe and stable operation of the power grid. The interconnection of modern power grids and the expansion of the grid-connected scale of intermittent new energy power sources, as well as the application of various new power electronic components, make the operating conditions of the power grid more complex, and the degree of damage to the transient stability of the power grid is greater. One of the main reasons for the blackout is that in the early stage and process of the power grid failure, the power grid monitoring system lacks an effective online quantitati...

Claims

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Application Information

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IPC IPC(8): H02J3/46
Inventor 刘道伟王蓓王虹富张隽侯俊贤高洵孙华东许晓菲马世英李轶群董毅峰贾琳吴为任玲玉
Owner CHINA ELECTRIC POWER RES INST
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