Distributed photovoltaic automatic generating control method based on sensitivity

Abstract

The invention provides a distributed photovoltaic automatic generating control method based on sensitivity. The control method includes the following steps: a) solving the mathematical relation of the power distribution network node voltage disturbance amount and node injection active-reactive disturbance amount through the local linearization around the distribution network stable-state operation working points, namely, analyzing the variation relation of the node voltage amplitude and node active-reactive injection through a sensitivity analytical method; b) based on the sensitivity relation of the node voltage and the node injection, selecting a node having the highest voltage sensitivity of the node active-reactive injection to the node voltage threshold-crossing or widely fluctuating nodes in a distribution network as an active-reactive adjusting node to participate in the active-reactive optimization regulation, wherein a photovoltaic power generation system which doesn't participate in the adjustment always works at the largest power tracking state; and c) establishing a distributed photovoltaic optimization model by taking the distribution network distributed photovoltaic output maximization and node voltage rated value deviation minimization as the target and taking the active-reactive output value of the active-reactive adjusting node as a solving variable.

Description

technical field [0001] The invention relates to a sensitivity-based distributed photovoltaic automatic power generation control method, which belongs to the technical field of photovoltaic power generation. Background technique [0002] With the increasingly severe energy crisis, renewable energy has been vigorously developed and become a trend, and photovoltaic power generation is an important form of it. With the development of distributed photovoltaic power generation technology, the further opening of energy policy and power market, the operation of distribution network needs to meet the high compatibility of distributed renewable energy generation. At present, the distributed photovoltaic power generation system connected to the distribution network is generally operated as an uncontrollable power source in the maximum power tracking (MPPT) mode, but when the distributed photovoltaic penetration rate in the distribution network continues to increase, due to the inherent...

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Problems solved by technology

However, frequent adjustment of transformer taps and shunt capacitors will greatly reduce the service life of the equipment, and it is difficult to achieve smooth adjustment of the distribution network voltage, which is easy to cause impact on the distribution network. The installation cost of reactive power compensation equipment such as SVC is high, and it is not suitable for large-scale scale application

Moreover, when the traditional reactive power adjustment methods in the distribution network cannot effectively suppress voltage fluctuations, it is easy to cause large-scale light abandonment and waste resources.

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