Capacity optimization configuration method for power distribution network composite energy storage device

Abstract

The invention discloses a capacity optimization configuration method for a power distribution network composite energy storage device. The method comprises the following steps of: (1), constructing acalculation model of a state of charge (SOC) of the energy storage device, (2) acquiring a load value of an independent microgrid system, (3) proposing an energy distribution strategy based on a low-pass filtering principle, (4) establishing a target function, (5) establishing constraint conditions of the target function, (6) constructing a simulated annealing particle swarm algorithm, (7) acquiring related parameters of a storage battery and a super capacitor, and (8) solving to obtain parameters such as the storage battery capacity, the super capacitor capacity andannual average cost, and further applying the steps (1) and (3) to obtain the charging and discharging power of the storage battery and the super capacitor. By optimizing and configuring the capacity of the power distribution network composite energy storage device, the distributed renewable energy consumption capacity of the power distribution network can be remarkably enhanced, and the power quality and the safety of power supply of the power distribution network under the condition that a high-proportion distributed power supply is connected are improved.

Description

Technical field [0001] The invention relates to the technical field of power grids, and in particular to a capacity optimization configuration method of a composite energy storage device of a distribution network under high-proportion distributed photovoltaic access. Background technique [0002] With the rapid development of distributed photovoltaic power generation systems in the distribution network, the traditional distribution network has been transformed into an active distribution network, giving it more flexible features such as demand response and load coordination control. The stable operation control of the power grid brings some problems: [0003] 1) After the distributed power source is connected to the distribution network, the distribution network is transformed from a single power source to a distributed active power distribution network with small and medium power sources. Its stable operation control faces higher requirements, especially intermittent and random D...

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Problems solved by technology

[0003] 1) After the distributed power supply is connected to the distribution network, the distribution network is transformed from a single power supply to a distributed active distribution network with small and medium-sized power supplies, and its stable operation control faces higher requirements, especially with intermittent, random When the distributed photovoltaic with high power density is connected to the distribution network, the power fluctuation of the distribution network will be more random, and the difficulty of stabilization will be greatly increased, and it will even be difficult to meet the power supply needs of users;

[0004] 2) The large-scale access of distributed photovoltaic power sources has a huge impact on the power quality of the distribution network, and the lack of reactive power compensation and three-phase unbalance control devices in the distribution network area will make it difficult to solve the problem of high power consumption. Power quality problems such as voltage dips and three-phase imbalances that occur after density distributed photovoltaic power sources are connected to the distribution network

However, limited by the electrochemical reaction rate, the power density of the battery is relatively small. When the load power changes suddenly, the target power cannot be quickly absorbed or released, and it is difficult to meet the dynamic requirements of the system.

When the supercapacitor is charged and discharged, what happens inside is a physical change. It has the characteristics of high power density. It can provide large power in a short time and provide buffer for other devices, but the energy density is relatively low.

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