Method for calculating grid-connected capacity limit of photovoltaic multi-infeed power system

A technology of power system and calculation method, which is applied in the field of grid-connected capacity limit calculation of photovoltaic multi-infeed power system, can solve problems such as restricting the grid-connected scale of new energy units, and achieve the effect of reducing small disturbance stability problems

Active Publication Date: 2019-03-19
ZHEJIANG UNIV +1
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  • Description
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Problems solved by technology

Studies have shown that after the increasing photovoltaic grid-connected capacity is connected, the power system presents a significant power electronic characteristic, which is prone to small disturbance stability problems, which restricts the grid-connected scale of new energy units

Method used

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  • Method for calculating grid-connected capacity limit of photovoltaic multi-infeed power system
  • Method for calculating grid-connected capacity limit of photovoltaic multi-infeed power system
  • Method for calculating grid-connected capacity limit of photovoltaic multi-infeed power system

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specific Embodiment

[0057] The specific embodiment that implements according to the complete method of content of the invention of the present application is as follows:

[0058] Build a photovoltaic five-feed power system in Matlab / Simulink software, such as figure 1 shown. The photovoltaic device in the five-feed system is a typical voltage source inverter. The outer ring of the inverter adopts constant DC voltage U dc control, such as figure 2 shown. figure 2 The physical meaning of each variable is shown in Table 1 below:

[0059] Table 1 U dc Control inverter variable correspondence table

[0060]

[0061]

[0062] u dc The parameter values ​​controlling the inverter variables are shown in Table 2 below:

[0063] Table 2 The parameter values ​​of the inverter variables in the simulation verification of the embodiment

[0064] DC side injection power P in / p.u.

1

DC capacitor voltage reference value U dcref / p.u.

1

Inner ring q-axis current re...

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Abstract

The invention discloses a method for calculating the grid-connected capacity limit of a photovoltaic multi-infeed power system. For the photovoltaic multi-infeed power system, an extended admittance matrix is calculated, and the generalized short-circuit ratio and the generalized short-circuit ratio critical value of the photovoltaic multi-infeed power system are acquired. Whether the absolute value of the difference between the generalized short-circuit ratio and the generalized short-circuit ratio critical value satisfies a given threshold to calculate the sensitivity of the generalized short-circuit ratio of the photovoltaic multi-input power system to the rated capacity of each photovoltaic device, and the capacity of the photovoltaic device is finely adjusted and up-regulated. The sensitivity is recalculated, and the rated capacity of a fan device is adjusted again according to the sensitivity, and iteration is continuously carried out to acquire the capacity limit. The method provided by the invention has the advantages of clear calculation ideas and simple process, can acquire the maximum value of the grid-connected capacity of the photovoltaic multi-infeed power system under the condition of small disturbance stability margin, provides guidance for the construction and expansion of a photovoltaic power station from the perspective of small disturbance stability, and contributes to the comprehensiveness of planning and design considerations of the power system.

Description

technical field [0001] The invention belongs to the technical field of new energy planning and design, and relates to a method for calculating the capacity of a power system, in particular to a method for calculating the grid-connected capacity limit of a photovoltaic multi-infeed power system. Background technique [0002] With the intensification of the global energy crisis and the increasingly severe environmental protection situation, the proportion of new energy units represented by photovoltaics in the power system is gradually increasing, becoming the trend of future energy development. However, unlike the large-scale new energy access in Europe and the United States, the local balanced consumption, the energy load distribution in my country is uneven, and the regions rich in photovoltaic resources are mostly located in the northwest, far away from the load center in the east. Grid-connected multi-proportional photovoltaic clusters have become an important trend in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/383H02J2203/20Y02E10/56
Inventor 辛焕海梁慧宇袁辉吴浩朱承治
Owner ZHEJIANG UNIV
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