Study the impact of energy storage power stations on grid
proportionality
Energy storage power stations mainly refer to energy storage systems
composed of various types of energy storage methods, which can effectively
achieve demand-side management, eliminate peak and valley differences, and
smooth loads. By adjusting the operation mode of the energy storage power
station, the electric energy sent by the distributed power sources is stored or
adjusted, and the distributed power sources are connected to the power grid with
high quality; the energy storage power station system can also be used to store
electric energy when the power is abundant and when the power is in short
supply. Release electric energy and solve the contradiction between supply and
demand.
The famous American scholar Jeremy Rifkin first proposed the vision of the
Energy Internet, which attracted widespread attention at home and abroad. The
Energy Internet combines Internet technology on the basis of smart grids to
change the energy utilization model. Rifkin believes that supporting the access
of large-scale distributed power generation systems and distributed energy
storage systems is one of the biggest features of the Energy Internet. The
traditional power system's ready-to-use operation mode will be replaced by the
energy storage, co-production, supply and use model, among which energy storage
power stations will be one of the most important technologies of the Energy
Internet. It is foreseeable that the current power system's out-of-the-box
operation mode will be replaced by the energy storage, joint production, supply
and use mode.
For a long time, the dynamic behavior analysis of the power grid has been
mostly realized through the simulation-modeling-solving method based on
reductionism, which makes it difficult to reasonably explain the internal
mechanism of large-scale power outages caused by small faults. Complex network
theory is used to analyze the topological structure of the power grid itself to
study the fault propagation mechanism and critical dynamic behavior, thereby
achieving system reconstruction, redesign and optimization.
Traditional power system nodes can be divided into two categories: power
generation and power reception. For example, power stations are power generation
nodes, and substations are power reception nodes. However, after adding an
energy storage system, the topology and functions of the system will change
accordingly. For example, an energy storage substation can be regarded as a
power-receiving node when storing energy, and can be regarded as a
power-generating node when discharging.
Energy storage power stations will have a direct effect and impact on the
operation of the power grid due to their role conversion from power generation
to power storage, and the topology of the power grid will inevitably change
accordingly. Among them, the role transformation of energy storage power
stations has the most direct impact on network proportionality. Assortative
Mixing, also known as symmetry, is a special complex network topological
structure feature. If a type of node with certain characteristics in the network
tends to connect to nodes with the same characteristics, it is called
Assortativity. If a node tends to connect to nodes with different
characteristics, it is called Disassortativity. .
For a long time, scholars have done a lot of work on the application
planning of energy storage power stations and established power station planning
models with different energy storage methods in different application scenarios.
Most of these models are based on the evaluation of economic benefits. In
addition, the small-world characteristics and scale-free characteristics of
power grids have also been studied in depth. Studies have shown that the
increase in proportionality will gradually destroy the critical behavior of the
system; the more frequent the occurrence of repeated node crashes, the greater
the scale of the crash.
Based on the above analysis, this paper is based on the study of typical
power grid proportionality and conducts further research on the changes in
proportionality mix after the energy storage power station is connected to the
power grid, aiming to find the intrinsic mechanism causing the difference in
proportionality and provide a basis for studying the topology of smart grids. It
provides the basis for the development and evolution of power systems and the
critical behavior of power systems.
in conclusion
Commensurate hybridity is a special network topological structure
characteristic and one of the important factors affecting the critical behavior
of network self-organization. It is of great significance for studying the
structural vulnerability of the power system, the inherent propagation mechanism
of cascading faults and the corresponding dynamic behavior of the power
grid.
Through the analysis of the g-l mixed mode of power grids with different
structures, it is found that the differences in topological structure and
functional positioning result in differences in the asymmetric characteristics
of the power grid. A power grid model based on the NW small world network was
designed. The distribution analysis of the model's symmetry coefficient,
characteristic path length and aggregation coefficient found that the small
world characteristics are the main factors that make some structural asymmetries
more significant.
In order to study the impact of different access methods of energy storage
power stations on network topology, an energy storage power station access model
based on random methods and regular methods was designed. By analyzing the
changing rules of the proportionality coefficient based on actual power grid
topology parameters, it is found that as energy storage nodes are continuously
connected to the network, the proportionality coefficient continues to increase,
that is, the proportionality is enhanced. The enhancement of proportionality
makes the distribution between different types of nodes in the network more
uneven, which reduces the power grid's ability to withstand cascading
failures.
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