Power grid risk assessment method considering component reliability of photovoltaic power plant

Abstract

The invention discloses a power grid risk assessment method considering component reliability of a photovoltaic power plant. The power grid risk assessment method comprises the steps of: firstly, classifying key components of the photovoltaic power plant according to a component failure mechanism, establishing a two-state model of an inverter and a multi-state model of a photovoltaic array respectively, and generating a photovoltaic power plant output power probability model considering component reliability through state sampling; secondly, extracting a photovoltaic output value according tothe established model, determining shutdown states and system loading states of a conventional generator and a conventional line, and acquiring a deterministic system state of a single sampling; thirdly, calculating a load shedding amount of a one-time deterministic sampling system by adopting a DC power flow optimal load shedding algorithm; and finally, calculating a system loss-of-load probability and an expected energy not supplied risk indicator through non-sequential Monte Carlo simulation. The power grid risk assessment method regards all the components of the photovoltaic array as a whole, classifies the components into a multi-state model according to a cumulative distribution function of the photovoltaic array, effectively alleviates the problems of large memory consumption, slowsampling speed, low calculation efficiency and the like caused by sampling the state of each photovoltaic components, and improve the efficiency of risk assessment for a power grid containing the photovoltaic power plant.

Description

technical field [0001] The invention relates to a power grid risk assessment method considering the reliability of photovoltaic power station components, and belongs to the technical field of power system risk assessment. Background technique [0002] The randomness, intermittence and volatility of photovoltaic power generation lead to more uncertainty when it is connected to the grid. The premise of risk assessment for a power grid containing photovoltaic power plants is to establish a probability model of the output power of photovoltaic power plants. A large number of power electronic components are used in photovoltaic power plants, and their component reliability has a relatively direct impact on photovoltaic output characteristics. Therefore, it is necessary to consider the influence of photovoltaic power plant component reliability when establishing a photovoltaic power plant output power probability model. [0003] Conventional component outage models adopt a two-st...

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Problems solved by technology

[0005] The present invention is aimed at the technical problems existing in the prior art, and provides a grid risk assessment method that considers the reliability of photovoltaic power station components. For the problem of risk, a power grid risk assessment method that considers the reliability of photovoltaic power plant components is proposed to evaluate the risks brought by grid-connected photovoltaic power plants and guide the safe and stable operation of the power grid

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