基于RTDS的有源配電網系統(tǒng)建模與故障特性仿真
[Abstract]:With the wide application of distributed generation (DistributedGeneration,DG), active distribution network becomes more and more common. Compared with the traditional distribution network, the structure of the active distribution network is more complex, and the fault characteristics of the active distribution network have changed obviously, especially the fault characteristics of the inverter distributed generation (Inverter-Based Distributed Generation,IBDG) are significantly different from those of the traditional power supply. In order to research and develop protection schemes and devices suitable for active distribution network, it is necessary to analyze the fault characteristics of active distribution network comprehensively and accurately. Therefore, this paper focuses on the modeling and fault characteristic simulation of active distribution network system with real time digital simulation system (Real-Time Digital Simulator,RTDS) as a tool. The main work is as follows: the simulation model of active distribution network system based on RTDS is established. Firstly, taking photovoltaic power supply (Photovoltaic,PV) as an example, the simulation model of IBDG is built, including the primary equipment and control system, and then the simulation model of active distribution network system is built with the typical radiation distribution network structure as an example. IBDG. with two constant Power (PQ) controls Fault simulation and fault characteristic analysis of active distribution network. By using the established active distribution network system model, the phase short circuit under different fault conditions, including the influence of fault type, fault location, transition resistance and so on, is simulated, and the phasor and sequence components of the simulation data are calculated. The size and distribution characteristics of voltage, current phasor and corresponding sequence components in active distribution network are analyzed intuitively. The simulation results show that the connection of IBDG makes the fault characteristics of the active distribution network quite different from that of the traditional distribution network, and the transient resistance can affect the voltage drop and the angle of the positive sequence current at the two ends of the fault point. The analysis and calculation of the active distribution network fault and the verification of the simulation results. On the premise of considering the influence of control strategy, the controlled current source is used as the fault equivalent model of IBDG, and the calculation method of its fault current is given, and the equivalent circuit of active distribution network with IBDG under different fault types is established. The voltage and current equation is established by the mesh current method and the equation is solved iteratively. The results of theoretical calculation verify the correctness of the simulation results. The closed loop test platform of active distribution network based on RTDS is constructed. Based on the proposed simulation model of active distribution network, the whole structure of the closed-loop test platform is designed, the use method of RTDS related board and the whole control logic are introduced, and the closed-loop test of a protective device is carried out by using the test platform. The feasibility of the scheme is verified.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM727
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