A Method for Computing the Probability Power Flow of Multi-Computer Balance

A probabilistic power flow and balancing technology, applied to AC networks with different sources of the same frequency, etc., can solve problems such as deviation and little impact on calculation results, and achieve the effect of ensuring accuracy and avoiding serious power limit violations.

Active Publication Date: 2017-07-14
STATE GRID CORP OF CHINA +1
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Problems solved by technology

When the unbalanced power brought by intermittent energy output fluctuations to the grid is small, the calculation of the system power flow using the conventional probabilistic power flow calculation with only one balanced generator has little effect on the calculation results; and when the unbalanced power of the system is large , the calculated results may have a large deviation from the actual situation

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  • A Method for Computing the Probability Power Flow of Multi-Computer Balance
  • A Method for Computing the Probability Power Flow of Multi-Computer Balance
  • A Method for Computing the Probability Power Flow of Multi-Computer Balance

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] In the calculation of the probability power flow of the present invention, the semi-invariant method combines the cumulant and the Gram-Charlier expansion series theory, and calculates the probability density function and cumulative distribution function of the branch through a comprehensive method. This method avoids complex convolution calculations and replaces them with simple algebraic calculations. The probability density function and cumulative distribution function of branches can be obtained by one calculation. In the traditional semi-invariant method, the system power unbalance is all borne by the designated balance node, so the calculation may cause the output of the balancing machine to be too large or too small or even negative, and the calculation result deviates far from the actual operating range. Th...

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Abstract

The invention relates to a method for calculating multimachine balance probability power flow. The method includes (1) acquiring probability power flow calculation data; (2) conducting power flow calculation; (3) acquiring a Jacobian matrix and ground state branch power flow; (4) modifying the Jacobian matrix; (5) calculating a sensitivity matrix; (6) calculating semi invariant of each odor of load and power of a generator; (7) calculating semi invariant of each odor of node injection power; (8) calculating semi invariant of each odor of node voltage and branch power; (9) calculating center distance of each odor of the node voltage and the branch power; (10) calculating the distribution law of the node voltage and the branch power. The method can be used for calculating primary frequency and secondary frequency characteristics of multiple generators, a calculation result meets the actual operation characteristics of a power system, the problems of severe power limit exceeding even negative power of a balance unit during probability power flow calculation through a traditional semi variant method, and the accuracy of the system probability power flow analyzing result is ensured.

Description

technical field [0001] The invention relates to a calculation method of probability flow, in particular to a method for calculating the probability flow of multi-computer balance. Background technique [0002] With the rapid development of the global economy, the ever-increasing world energy demand and the fossil fuel-based mineral energy consumption pattern have led to increasingly prominent problems of energy resource shortage, environmental pollution and climate change. Based on their own resource conditions and economic development goals, countries around the world are actively participating in the development of green energy industries in order to increase their energy supply. my country is in the stage of rapid development of intermittent energy power generation. As of the end of 2013, the cumulative installed capacity of wind power in China was 91.42 million kilowatts, ranking first in the world. In 2013, China's new photovoltaic installed capacity was 11.3 million k...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
Inventor 石飞冯树海於益军王珂李亚平周竟曾丹王礼文刘俊徐鹏
Owner STATE GRID CORP OF CHINA
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