Electrical power system metric data time difference compensation state estimation method

A technology of state estimation and measurement data, which is applied in the field of state estimation under different measurement delay conditions of the power system, and can solve problems such as inconsistent data sections and inability to handle measurement errors well

Inactive Publication Date: 2008-08-06
NR ELECTRIC CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the measurement error problem that the conventional state estimation method cannot handle well due to the acquisition time difference, a kind of power system measurement data time difference compensation state estimation method is proposed, by combining PMU measurement, conventional RTU The characteristics of measurement and forwarding measurement data give full play to the role of fast measurement and solve the problem of inconsistent data sections caused by different measurement delays

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  • Electrical power system metric data time difference compensation state estimation method
  • Electrical power system metric data time difference compensation state estimation method
  • Electrical power system metric data time difference compensation state estimation method

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[0045] As shown in Figure 1, if the line power loss is ignored, then: Pb≈-Pa, if the Pa telemetry value changes linearly, then Pb also changes linearly. The data sections were collected at time t2 and t4 respectively. If there is a delay at the Pb measuring point, the actual power collected at the Pb measuring point is the power at time t1 and t3, as shown in Figure 2.

[0046] As shown in Fig. 2 line power measurement change, if there is no time difference in acquisition, the measurement in state change estimation should be Pa4-Pa2 and Pb4-Pb2, and the change estimation can be obtained. Assuming that there is a fixed delay in Pb acquisition, since t4-t2=t3-t1, then Pb4-Pb2=Pb3-Pb1. From the above analysis, it can be seen that when the state change is estimated, the measurement difference of two sections can be directly used to form the measurement phasor, and the acquisition time difference of each measurement point has little influence on the calculation result.

[0047] Fr...

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Abstract

A power system measurement data time difference compensation state estimation method takes the quickest data acquisition time as the state estimation reference time to compensate measurement errors caused by other measurement time delays to obtain an updated electric network state. Regarding a PMU quick belt time mark measurement, updated real-time measurement data is adopted to take part in the state estimation and serve as the time of state estimation electric network section; regarding the measurements with time delays, corresponding time difference compensation factors are introduced according to the different time delays to finally obtain the updated state of the whole electric network through using the measurement variance of the updated continuous data section, modifying the time difference compensation factors according to the actual time delay conditions in the interactive process, and solving the time difference compensation state estimation equation.

Description

1. Technical field [0001] The invention relates to a state estimation method of a power system, in particular to state estimation under different measurement delay conditions of the power system. 2. Background technology [0002] A major trend in the development of modern power systems is grid interconnection. While grid interconnection brings huge economic benefits, it also brings coordination and control problems. Only by comprehensively optimizing and dispatching the grid from a global perspective can the security of the interconnected grid be guaranteed. and economy. Since the failure of the adjacent grid will directly affect the safety of the internal grid, the model and data of the adjacent grid are also important for the analysis and control of the grid. In order to obtain network-wide collection and measurement, different transmission methods are often used according to different communication conditions, and different transmission methods also cause data collection...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R19/06G01R31/00
Inventor 顾全陈松林陈根军钱锋李九虎郑玉平沈国荣
Owner NR ELECTRIC CO LTD
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