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Status estimating method for dynamic process of electrical power system

A technology of state estimation and dynamic process, applied in the direction of system integration technology, information technology support system, measuring electricity, etc., can solve the problems of not many distribution points, unable to effectively monitor the power grid, and RTU measurement can not reflect the operating state of the power grid, etc., to achieve speed Fast, satisfying the effect of real-time monitoring

Active Publication Date: 2008-10-22
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0007] The problem to be solved by the present invention is: when the power grid is disturbed, the conventional RTU measurement cannot reflect the complete operating state of the power grid within a period of time, and the power grid during the disturbance process cannot be effectively monitored due to the inability to obtain the complete state of the power grid during the disturbance process. Although PMU measurement can obtain the continuous change process of voltage, power, and phase angle during the disturbance process, there are not many PMU measurement points at present, which cannot directly meet the observability requirements of power grid state estimation

Method used

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  • Status estimating method for dynamic process of electrical power system
  • Status estimating method for dynamic process of electrical power system
  • Status estimating method for dynamic process of electrical power system

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Embodiment Construction

[0022] The invention performs equivalent processing on the power grid according to the state of the power grid before the disturbance, and only relies on PMU measurement during the disturbance process, and at the same time tracks the PMU measurement change, provides a continuous section of the power grid change process, and realizes the state estimation of the dynamic process. The static state estimation method is used in the normal operation of the power grid, and the dynamic process state estimation is started after the disturbance occurs. Based on the static state estimation result before the grid disturbance, the load model and the generator model are introduced to perform equivalent processing on the power grid. In the process of grid disturbance, the synchronous phasor measurement unit PMU is used to measure the generator data, combined with the active and reactive zero injection pseudo measurement equations of the original grid nodes, to estimate the state of the grid nodes...

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Abstract

The invention provides a method for estimating a state of dynamic process of a power system. The method takes an estimated result of the static state before the electric grid disturbance as a basic section and introduces a load model and a motor model to perform the equivalent treatment to the electric grid; in the process of the electric grid disturbance, a synchronous phasor measuring unit(PMU) is used to measure and obtain data of a motor, and according to the active power and the reactive power zero injection pseudo-measurement equations of all nodes of the original electric grid, states of all nodes of the electric grid are estimated, and the state of dynamic process of the electric grid is acquired only by the PMU measurement of a power plant. Because the state of the electric grid before disturbance is taken as a basis and only the PMU distribution of the power plant is required, the method effectively resolves the problem of state monitoring under the condition of the electric grid disturbance; on the same disturbance, for continuous PMU measurement sections, PMU measurement data can be directly put in iterative computations, thereby the continuous sections in the process of electric grid disturbance are provided for stable control and analysis; moreover, the method is fast in speed, so that the method meets the requirement for monitoring the dynamic process in real time.

Description

Technical field [0001] The invention relates to a method for applying power system synchronous phasor measurement unit PMU (Phasor Measurement Unit) measurement for state estimation, in particular to a power system dynamic process state estimation method based on PMU measurement, which performs state on the continuous process of grid disturbance estimate. Background technique [0002] In most cases, the power grid is in a stable state, and the load change is a slow process. Although the measurement in the EMS is not collected at the same time, because the actual power grid changes slowly, the error generated by the collection time is relatively large compared to the meter error. Therefore, it can be considered that what is collected is the same time section of the power grid. The static state estimation is calculated for a complete grid state and can meet the needs of monitoring and control under the normal operation of the grid. [0003] Under the disturbance conditions of the p...

Claims

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Application Information

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IPC IPC(8): H02J3/00G01R31/00
CPCY02E60/728Y04S10/265Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 顾全陈松林陈根军王新宝钱锋李九虎郑玉平沈国荣
Owner NR ELECTRIC CO LTD
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