Probability assessment method of effects of distributed photovoltaic power supply access

A distributed photovoltaic and power supply technology, applied in photovoltaic power generation, photovoltaic system monitoring, photovoltaic modules, etc.

Active Publication Date: 2012-07-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In this way, when the system contains a large number of distributed photovoltaic power sources, the instability of its active output will cause sudden changes in the power flow of the system. Suitable

Method used

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  • Probability assessment method of effects of distributed photovoltaic power supply access

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Embodiment Construction

[0030] The specific embodiment of the present invention is as figure 1 shown in the process. The implementation steps of this embodiment are as follows:

[0031] The first step is to input the original data, including line parameters, generators, load injection power and other data required for general power flow calculations. In addition, information about the random distribution of node injection quantities should be given. Calculate its expected value and variance, etc.;

[0032] In the second step, if there is photovoltaic power generation in the network, the observed light intensity of 24 hours a day is given. These data can be obtained by a software called HOMER. Using this software, the light intensity value of each month can be used to generate each month at a pre-specified location. Hourly light intensity value;

[0033] In the third step, after knowing the light intensity value per hour of the day, the average value and variance of the light intensity value for ea...

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Abstract

A probability assessment method of effects of distributed photovoltaic power supply access mainly includes inputting initial data including network line parameter, generator power and load node power, type and nominal power of a distributed power supply and the like; inputting observation light intensity of access places of the distributed photovoltaic power supply at 24 hours one day; calculating output power initial value of the distributed photovoltaic power supply; calculating power flow distribution under normal operation condition; calculating each-stage cumulant of random variable of output power of the distributed photovoltaic power supply; calculating each-stage cumulant of node random injection power according to property of the cumulant; further calculating each-stage cumulant of state variable; and calculating system voltage out-of-limit probability of one year to assess effects of distributed photovoltaic power supply access. The probability assessment method completely considers load power and probability distribution characteristics of the distributed photovoltaic power supply output and is capable of accurately assessing effects of distributed power supply access. The method is suitable for probability assessment of effects of distributed photovoltaic power supply access.

Description

technical field [0001] The invention relates to a probability evaluation method for the influence of distributed photovoltaic power source access, which belongs to the technical field of photovoltaic power source grid connection. Background technique [0002] The combination of large power grid and distributed generation (DG) is an important way to save investment, reduce energy consumption, improve the reliability and flexibility of the power system, and it is also the main development direction of the future power grid. Although distributed power access can bring a series of benefits to grid operation, a large number of distributed power access will also have a great impact on the structure and operation of the distribution network. The most fundamental reason is that distributed power After access, the power flow of the distribution network will no longer flow in one direction, and the radial network will become a network that interconnects power supplies and users. The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00H02S50/10
CPCY02E10/50
Inventor 范瑞祥肖红霞
Owner STATE GRID CORP OF CHINA
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