The power system is not a simple energy system. Its cost is high, the test is very harmful, and it generally takes a long time to understand the consequences of system changes. Therefore, simulation technology is used in the planning and design of the power system, debugging and testing, operation and maintenance, etc. It is widely used in the whole life cycle and has an irreplaceable important role.
The traditional power system is dominated by thermal power and hydropower generators on the power supply side, AC transmission based on overhead lines on the power grid side, and induction motors on the load side. There are only a small amount of power electronic equipment, and the entire grid system has a moment of inertia. Large, high controllability. With the massive access of new energy sources represented by wind power and photovoltaics, and the rapid withdrawal of traditional power sources represented by thermal power, the power system will be increasingly affected by the stability of new energy sources. In addition, the rapid increase of power electronic equipment with the increase of new energy sources will also greatly affect the control stability of the power supply side of the power system, and will also bring about power quality problems such as harmonics; the grid side will use more AC power transmission With the rapid increase in the scale of cables and flexible DC transmission, the operation of the power grid will be more complicated; on the load side, the proportion of power electronic loads represented by electric vehicle charging stations and energy storage stations is rising rapidly, and the law of load changes is difficult to grasp. Therefore, the uncertainty and variability of the power system will greatly increase. The traditional power grid analysis theory, operating experience, and simulation methods may no longer be fully applicable to the new power system. The new power system simulation faces new challenges and new problems. The role and positioning of simulation technology will also be adjusted accordingly.
New power system brings changes in simulation mode
Fundamental wave-based simulation mode can no longer meet the requirements of new power system simulation accuracy. It needs to carry out simulation in a wider frequency band, which brings a great amount of calculation to digital simulation, which has greatly exceeded the traditional single-machine system. Simulation software capabilities for non-real-time calculations. However, the real-time simulation of the new power system requires huge resources and is expensive, and it cannot be widely popularized and applied in various majors of the power system.
The quasi-real-time simulation mode of high-performance computer plus power electronics special simulation hardware will effectively solve the new power system simulation problem, use power electronics special simulation hardware to improve the simulation scale, efficiency and accuracy of power electronic equipment, and use supercomputers to simulate traditional power Components, collect multiple power electronic simulation hardware data, realize the high-efficiency and high-precision simulation of the new power system.
The technical threshold and maintenance cost of the new power system simulation are relatively high. The traditional stand-alone simulation mode can no longer fully meet the needs of the new power system simulation. The cloud simulation mode is easy to be shared by multiple users and will be more and more applied.
New power system brings simulation technology changes
The characteristics of new energy in the new power system that are affected by natural conditions. Power system simulation should not only consider the impact of power equipment, but also the impact of natural environmental factors such as wind, light, and temperature. This will make the power system simulation from a single electrical field to the air Dynamics, structural mechanics and other professional fields have developed. Large-scale multi-professional field joint simulation will greatly increase the complexity and difficulty of simulation. This is an unprecedented challenge. Simulation technology needs to advance multi-professional field models and models on this basis. Breakthroughs and changes in the co-simulation mechanism.
The new power system equipment is more diverse, and the simulation time scales of different types of equipment are quite different. The co-simulation of multi-time scale equipment requires a large number of data exchange interfaces, and the multi-port, high-bandwidth, low-latency, and high-precision data exchange technology is in urgent need of breakthrough. To meet the needs of new power system simulation.
New power system brings changes in simulation application scenarios
New power system simulation needs are more diversified, no longer limited to planning and design, production support, education and training, etc., network information security testing and intelligent technology cultivation also need to be applied to simulation systems. The new power system is inevitably a highly concentrated system of digitization, informationization, and intelligence. Simulation technology can promote the construction of digital information security fortresses, and can realize the rapid iteration and mature implementation of intelligent technologies.
The traditional application scenarios of simulation technology will also be greatly expanded. It will no longer be limited to traditional power plant simulation, power grid operating condition simulation and substation simulation, but will also be used in wind farms, photovoltaic power plants, offshore wind power grids, and low-frequency AC. It is widely used in new scenarios such as power transmission and energy storage systems.
Looking forward to the new power system simulation technology in the future, the professional fields will be broader, the application of information technology will be more in-depth, the degree of intelligent openness will be further improved, and the technology intensity will continue to increase. Simulation technology will be an indispensable technical pillar for the construction, operation and maintenance of new power systems.
