Simulation method and device for distributed inverter simulation system

Abstract

The invention provides a simulation method and device for a distributed inverter simulation system. According to the simulation method and device for the distributed inverter simulation system of theinvention, voltage and current outputted by a distributed inverter physical system, as well as voltage and current outputted by a distributed inverter simulation system are acquired; a voltage correction matrix and a current correction matrix are determined; and the voltage and current outputted by the distributed inverter simulation system are corrected, the real-time simulation of the multi-point access grid-connection of a plurality of distributed inverters can be realized, and simulation precision and the credibility of simulation results can be improved. The voltage and current outputtedby the distributed inverter simulation system are checked on the basis of the voltage and current outputted by the distributed inverter physical system, and therefore, error between the simulation system and the physical system can be decreased, and the high accuracy of simulation can be achieved. With the simulation method and device for the distributed inverter simulation system provided by thetechnical schemes of the present invention adopted, necessary premises can be provided for a high-density and large-scale distributed energy system in power flow control, reactive voltage, system stability and electric quality research.

Description

technical field [0001] The invention relates to the technical field of distributed power grid connection, in particular to a simulation method and device for a distributed inverter simulation system. Background technique [0002] Distributed power generation connected to the smart grid has entered a new stage of development in my country. Distributed renewable energy grid-connected units have the characteristics of small installed capacity, large quantity, and free and flexible control. The resulting high-density distributed inverter The system has brought new challenges to the operation and control of the power grid, and its impact on the power system has become increasingly serious. In order to realize the friendly coordination between distributed energy sources and the power grid, and then ensure the safe operation of the power system, it is very necessary to study the real-time simulation system of multi-distributed inverters with small step size and multi-nodes. [0003...

AI Technical Summary

Problems solved by technology

Therefore, the establishment of a distributed inverter simulation system with a small step size for electromagnetic transient analysis is greatly limited in its simulation scale.

In order to solve this problem, a rough quasi-steady-state model of the power electronic unit is usually used in the prior art to model, but this rough quasi-steady-state model of the power electronic unit is very different from the operating characteristics of the actual physical device, and cannot be accurately Reflect the real equipment operating characteristics and transient behavior, the simulation accuracy and the credibility of the simulation results are low

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