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State estimation method for electric power system considering influences of multi-balancing machine

A technology for power system and state estimation, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as difficulty in meeting unbalanced power balance requirements

Inactive Publication Date: 2010-05-05
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a power system state estimation method that takes into account the influence of multiple balancing machines for the defect that the setting of a single balancing machine in the interconnected grid has been difficult to meet the balancing requirements for unbalanced power

Method used

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  • State estimation method for electric power system considering influences of multi-balancing machine
  • State estimation method for electric power system considering influences of multi-balancing machine
  • State estimation method for electric power system considering influences of multi-balancing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] The present invention adopts the standard calculation example of IEEE-14 node shown in Fig. 3(a) to simulate the calculation examples with single balancing machine and multiple balancing machines. The system parameters are shown in Table 1, and the simulation results are shown in Table 2. Show:

[0107] Table 1 System parameter table

[0108] Types of

Balance node

Redundancy

1

1

2.15

2

1，2

2.33

3

1，2，3，8

2.80

[0109] Table 2 Table of simulation results

[0110]

Embodiment 2

[0112] The present invention uses the IEEE-30 node standard calculation example shown in Figure 3(b) to simulate the calculation examples for a single balancing machine and multiple balancing machines. The system parameters are shown in Table 3, and the simulation results are shown in Table 4. Show:

[0113] Table 3 System parameter table

[0114] Types of

Balance node

Redundancy

1

1

2.07

2

1，2，5

2.22

3

1，2，5，8，11

2.40

[0115] Table 4 Table of simulation results

[0116]

Type 1

Type 2

Type 3

J

0.003482

0.003665

0.003681

EMI

0.008891

0.008891

0.008891

EEI

0.006351

0.006212

0.006164

EMO

0.007513

0.007513

0.007513

EEO

0.005251

0.005130

0.005087

[0117] among them, J = X i = 1 m [ z i - h i ( x ^ ) σ i ] 2

[0118] EMI = [ 1 m X i = 1 m ( EM i ) 2 ] 1 2 , EEI = [ 1 m X i = 1 m (...

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Abstract

The invention discloses a state estimation method for an electric power system considering the influences of a multi-balancing machine. The method comprises the following steps of: firstly, according to the needs of the system, setting a group of multi-balancing machines for commonly sharing the imbalanced power of the system; secondly, deriving a computational formula of a measurement vector according to the setting of the multi-balancing machines, solving a Jacobian matrix of the measurement vector with respect to a quantity of state, and estimating the state of the system by using a least squares estimation criteria . Because the influences the multi-balancing machine is considered, the imbalanced power of the system is commonly shared by setting a group of multi-balancing machines, and the result of the state estimation accords with the practical situation better. In addition, the method can realize the state estimation considering the influences of the multi-balancing machine only by slightly amending the measurement function and the Jacobian matrix parts of the prior state estimation software. The invention has definite physical meaning, is convenient to realize in the traditional state estimation software and satisfies the requirements of engineering on the estimation precision.

Description

Technical field [0001] The invention relates to a power system state estimation method that takes into account the influence of multiple balancing machines, and belongs to the technical field of power system operation and control. Background technique [0002] State estimation is also called filtering. It uses the redundancy of the real-time measurement system to improve data accuracy, automatically eliminates the error information caused by random interference, and estimates or predicts the operating state of the system. With the implementation of power transmission from west to east and the rapid implementation of the power market, UHV, long-distance, AC and DC hybrid transmission technology has developed rapidly in my country's power grid, and the automation level of the power system dispatch center needs to be gradually improved. As an important part of the energy management system (EMS) of modern large-scale power systems at all levels of dispatch centers, state estimation p...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/46G06F17/11
Inventor 孙国强卫志农叶芳
Owner HOHAI UNIV
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