An Online Equivalent Modeling Method for Large-Scale Photovoltaic Power Stations Suitable for Safety and Stability Analysis

Abstract

The invention discloses a large photovoltaic power station on-line equivalence modeling method suitable for safety and stability analysis, and belongs to the technical field of electric power systems and automation thereof. The large photovoltaic power station on-line equivalence modeling method comprises the following steps of matching parameter sensitivity of photovoltaic inverters and a reference response curve of systems in an on-line manner through actual measurement information on the basis of an inverter parameter sensitivity matrix and reference response curved line gather which is established in an off-line manner; calculating clustering indexes of the inverters and clustering and grouping the inverters by using the inverters as gathered objects; and performing on-line dynamic equivalence on a large photovoltaic power station according to the inverters on the premise that requirements on the safety and stability analysis and simulation precision are met. By performing on-line equivalence modeling on the large photovoltaic power station, a reliable photovoltaic power station simulated model can be provided, the complexity of the large photovoltaic power station model can be reduced, so that the calculated amount of safety and stability analysis on a power grid is effectively reduced, and the on-line safety and stability analysis, early warning and controlling decision-making level is improved.

Description

technical field [0001] The invention belongs to the technical field of power systems and automation thereof, and more precisely, the invention relates to an online equivalent modeling method for large photovoltaic power plants suitable for safety and stability analysis. Background technique [0002] The large-scale photovoltaic power stations developed in my country using the "centralized development, high-voltage transmission" model are mostly concentrated in the desert / semi-desert areas with rich sunshine resources such as Northwest and North China. These areas generally have a wide geographical scope and small local loads. distance delivery. With the continuous increase in the number and scale of photovoltaic power plants, when the photovoltaic power generation is in a dynamic state such as cloud generation and disappearance on the site side and / or abnormal operation conditions such as failure on the grid side, the complex interaction between photovoltaic power plants and ...

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Problems solved by technology

The patent "Mathematical Modeling Method of Photovoltaic Power Station for Temporary / Dynamic Analysis of Power System" (Patent No. ZL200910019584.6) proposes a photovoltaic power station modeling method for temporary / dynamic analysis of power system, but it uses simplified photovoltaic power station Modeling is carried out in the form of a mathematical model, and the static output characteristics of photovoltaic power plants are used to replace the dynamic output characteristics. A modeling method for dynamic equivalent impedance of large-scale photovoltaic power plants, which is mainly suitable for power flow calculations and short-circuit calculations of power systems, and has limitations in online security and stability analysis of power systems; patent application "A VSC-based grid-connected Electromechanical Transient Modeling Method for Photovoltaic and Energy Storage Power Stations" (Application No. CN201110328049.6) Aiming at grid-connected photovoltaic and energy storage power stations based on voltage source inverters (VSC), combined with the operating characteristics of VSC itself, a new The modeling method of energy generation equipment, this method is mainly aimed at voltage source converters, and all voltage source converters are modeled, it is difficult to apply to the online equivalent calculation of large-scale photovoltaic power plants

The modeling method proposed in the patent application "A Modeling Method for Photovoltaic Power Generation System Model" (Application No. CN201310044255.3) is to establish the photovoltaic square array and grid-connected photovoltaic inverter models separately, and to calculate the online equivalent of large-scale photovoltaic power plants It is difficult to meet the requirements of computing speed

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