Equivalent model construction method for fuel battery power generating system

Abstract

The invention discloses an equivalent model construction method for a fuel battery power generating system. In the fuel battery power generating system, a fuel battery outputs electric energy to a power grid via an inverter, and the fuel battery power generating system is characterized in that external characteristics of the fuel battery power generating system in a grid-connected operation environment can be described by an equivalent circuit shown as a figure 3 in the specification, and a mathemathical model of the system is represented by the following second-order dynamic differential equation in the specification, wherein IL.d and IL.q are components of axis d and axis q of the output current of the inverter; Vinv is outlet voltage of the inverter; Vgrid.d and Vgrid.q are components of axis d and axis q of the voltage at PCC (Point of Common Connection) between the fuel battery power generating system and the power grid; and R and Lf are equivalent resistance and equivalent inductance respectively. By adopting the equivalent model of the fuel battery power generating system, stable-state and transient-state characteristics of the fuel battery power generating system under a grid-connected operation condition can be simulated accurately.

Description

technical field [0001] The invention belongs to the field of power system load modeling, and relates to an equivalent model construction method of a fuel cell power generation system. technical background [0002] The increasing human demand for energy has made more development and utilization of clean and renewable new energy a major social issue related to human survival and development. Therefore, new energy power generation has been highly valued and developed rapidly, and its installed capacity has grown rapidly. Concepts and technologies such as conventional power generation, microgrid, and smart grid have also emerged as the times require. The emergence of a large number of distributed generating sources (Distributed Generating Source, DGS) has changed the load composition and topology of the traditional distribution network, and brought a series of new theoretical methods and technical problems to be solved urgently for power system analysis and operation control. T...

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Problems solved by technology

Some of these literatures focus on the dynamic behavior of FC itself, and some focus on the dynamic behavior of the connection with the grid; the former has a complex model, which is difficult to apply in power system simulation calculations, and the latter is too simplified and does not consider FC power generation. The overall dynamic characteristics of the system; there is a lack of a model system that can accurately reflect the characteristics of FC itself and can simulate grid connection

However, research on the second question is rarely reported.

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