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Single unit equivalent method, system and equipment for photovoltaic power station analysis

A technology of photovoltaic power station and equivalent method, applied in the field of value, can solve the problem of inability to take into account the amount of calculation and accuracy, and achieve the effect of clear physical meaning, easy to grasp, and few parameters

Active Publication Date: 2021-05-07
HARBIN INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem that the traditional stand-alone equivalent method of photovoltaic power station cannot balance the calculation amount and accuracy

Method used

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  • Single unit equivalent method, system and equipment for photovoltaic power station analysis
  • Single unit equivalent method, system and equipment for photovoltaic power station analysis
  • Single unit equivalent method, system and equipment for photovoltaic power station analysis

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 To describe this embodiment,

[0028] The method for analyzing the equivalent value of a single unit of a photovoltaic power station described in this embodiment includes the following steps:

[0029] Step 1, as figure 2 As shown in an actual 50MW photovoltaic power plant (100 units, each unit 1.5MW, the unit parameters are shown in Table 1) as an example, all the photovoltaic generators in the photovoltaic power station are equivalent to one unit, and the following is obtained: image 3 For the stand-alone equivalent system shown, run the stand-alone equivalent system to t 0 (2s) moment, t 0 Indicates the moment when a three-phase short-circuit fault occurs at the outlet of the photovoltaic power station (in this embodiment, the voltage drops to 0.3p.u.).

[0030] Table 1 Main parameters of photovoltaic generator set

[0031]

[0032] Step two, such as image 3 The stand-alone equivalent system shown starts f...

specific Embodiment approach 2

[0043] This embodiment is a photovoltaic power station analysis stand-alone equivalent system, and the system is used to implement a photovoltaic power station analysis stand-alone equivalent method.

specific Embodiment approach 3

[0045] This embodiment is a device for analyzing the equivalent value of a single machine in a photovoltaic power station, and the device is used for storing and / or operating the system for analyzing the equivalent value of a single machine in a photovoltaic power plant. Devices described in the present invention include, but are not limited to, computers.

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Abstract

A method, system, and equipment for analyzing single-unit equivalence of a photovoltaic power station relate to a method and system for analyzing a single-unit equivalent of a photovoltaic power station. The invention aims to solve the problem that the calculation volume and accuracy of the traditional stand-alone equivalent method of the photovoltaic power station cannot be balanced. The method of the present invention provides an analytical expression of the active dynamic behavior of the photovoltaic power station in the whole process of fault ride-through, and calculates the active current component according to the dynamic current analytical expressions of the photovoltaic power station during the fault period and after the fault is cleared, and replaces the single machine, etc. The active power control channel of the value system is t during the fault period 0 ~t c time period and after the fault clears t c The active current reference value at the corresponding time after time forms a new stand-alone equivalent method, which can accurately simulate the dynamic behavior of detailed photovoltaic power plants in the whole process of fault ride-through, and effectively eliminates the equivalent error. It is mainly used in the single-machine equivalent process of photovoltaic power station analysis.

Description

technical field [0001] The invention relates to a single-unit equivalent method and system for photovoltaic power station analysis, and belongs to the technical field of power system simulation modeling. Background technique [0002] As the grid-connected scale of photovoltaic power generation continues to increase, it is increasingly important to correctly evaluate its impact on the power system. However, a large-scale photovoltaic power station often contains hundreds of units. If each unit is modeled separately, the complexity of the power system simulation model and the simulation calculation time will be greatly increased. Therefore, it is increasingly important and urgent to establish an effective photovoltaic power plant equivalent model. [0003] At present, the equivalent methods of photovoltaic power plants can be divided into two types: single-unit equivalent and multi-unit equivalent. Multi-unit equivalence is based on the traditional generator "coherence" idea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCG05B23/0254G05B2219/24065
Inventor 晁璞璞李卫星牟晓明段方维张艳军韩月刘道伟孙峰王超
Owner HARBIN INST OF TECH
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