Active power distribution network transient state real-time simulation multi-rate interface method based on FPGA

Abstract

Provided is an active power distribution network transient state real-time simulation multi-rate interface method based on an FPGA. Example basic information is read under an offline environment, and time te needed for calculation of each time step of an electrical system in the FPGA and time tc needed for calculation of each time step of a control system in the FPGA are calculated; a real-time simulation step size delta te of the electrical system is set according to the te; a real-time simulation step size delta tc of the control system is automatically determined according to a formula (please see the formula in the specification); correlation calculation parameters of elements and the example basic information are figured out and uploaded to an online simulation environment, computing resource allocation is carried out, and simulation time t is equal to zero; calculation of one time step and calculation of k time steps are carried out on the electrical system and the control system respectively, wherein t=t+delta tc, and t=t+delta te; the electrical system and the control system carry out multi-rate interface communication; whether the simulation time reaches simulation ending time is judged. The method is easy to achieve, solving time of the electrical system and the control system can be worked out in advance, proper real-time computing time steps are set, multi-rate interface parallel simulation is achieved, on the premise that simulation precision is guaranteed, solving time is greatly shortened, and the implementation difficulty of active power distribution network transient state real-time simulation is reduced.

Description

technical field [0001] The invention relates to a transient real-time simulation method of an active distribution network. In particular, it relates to an FPGA-based multi-rate interface method for transient real-time simulation of an active distribution network. Background technique [0002] In recent years, the smart grid has become a research field that has received wide attention. As an important part of the smart grid, the distribution network, many new demands such as distributed power supply, electric vehicles and user-side load response will bring huge changes to the traditional passive power distribution system, making it an active and active power distribution system. This puts forward new requirements and challenges for the distribution network in many aspects such as planning and design, operation scheduling, control and protection, and simulation analysis. Develop fast and effective simulation tools and simulation methods to analyze various steady-state and tr...

AI Technical Summary

Problems solved by technology

However, in the distributed generation unit, the switching frequency of power electronic equipment is getting higher and higher, from several kHz to 10kHz or even higher, making the calculation step size satisfying power electronic equipment simulation smaller and smaller

From the perspective of transient simulation, the existence of power electronic equipment will cause problems such as time-varying calculation matrix, switching action between steps, and numerical oscillation. The accurate solution of these problems requires a long simulation time

More importantly, the time occupation of these additional calculations is often unpredictable

On the other hand, due to the variety of distributed power sources, the mathematical calculations in the control system are complex, there are many logical judgments, and there is strong nonlinearity, which makes the solution scale of the control system also relatively large.

Therefore, in terms of computational efficiency, the serial solution sequence is relatively inefficient. When the system scale is large, it takes a long time to calculate. From the perspective of transient real-time simulation, the solution of the entire system needs to be completed within one time step. The calculation time for the serial solution of the electrical system and the control system is the superposition of the calculation time of the two systems, and for the simulation of power electronics, the step size should be as small as possible to ensure the simulation accuracy, so this contradiction increases the realization of real-time simulation difficulty

[0025] The patent "Parallel calculation method for transient simulation of active distribution network suitable for node analysis framework" proposes a parallel calculation method for electrical and control systems, which is suitable for the case where the calculation steps of the electrical and control systems are consistent in transient simulation. However, In the transient real-time simulation of the active distribution network, the simulation of the electrical system requires a small calculation step, and the control system solution needs to deal with the distributed power source itself and its control system. The calculation is completed within the simulation step size of the electrical system, so the calculation step size of the real-time simulation of the control system may not be consistent with the calculation step size of the electrical system

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