A quasi-accurate modeling method for source-load coupling of battery energy storage systems with pulsed loads

Abstract

The invention discloses a source-load coupling quasi-accurate modeling method for a battery energy storage system with a pulse load, comprising the following steps: establishing a circuit structure of a battery energy storage system with a pulse load, the circuit structure including a battery energy storage system, a DC / DC Converter and pulse load; use the first-order Thevenin equivalent circuit to simulate the ohmic internal resistance and polarization internal resistance of the battery energy storage system; establish the switching function u of the DC / DC converter 1 and the pulse load switching function u PL , establish a third-order bilinear exact switching model; retain the switching function u PL Exact switching model, for the switching function u 1 Averaging processing is used to obtain a quasi-accurate model of source-carrier coupling. The invention not only simplifies the complexity brought by the ultra-high frequency component, but also can effectively analyze the impact of the pulse load on the pulse dynamic trend and the change law of the battery energy storage system with the pulse load.

Description

Modeling method of source-load coupling quasi-accurate model of battery energy storage system with pulsed load technical field The present invention relates to the field of electrical energy storage systems, in particular to a source-load coupling of a battery energy storage system with a pulse load Accurate and accurate model modeling method. Background technique With the wide application of high-power pulse weapon systems such as radar, electromagnetic ejection, electromagnetic gun in national defense and military, for This kind of pulsed load provides electric energy with matching characteristics, which has attracted more and more attention of researchers. Consider the silence of this type of weapon system Demand and idle energy consumption characteristics, the most commonly used power supply formula is the battery energy storage system ESS, research with pulse load battery energy storage system (CA‑PL: Cell Array with Pulsed Load), the pulse characteristics of t...

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Problems solved by technology

[0003] The power supply voltage of high-pulse loads such as radar is relatively high (600V~700V), and the output voltage of the battery energy storage system ESS often needs to be boosted by a DC / DC converter to supply power to pulse loads. The power supply structure is as follows: figure 1 As shown, when the battery energy storage system ESS supplies power to the load, the DC / DC converter generally works in Boost mode. The difficulty in analyzing the battery energy storage The power pulse characteristics seriously affect the output characteristics of the source, that is, the output voltage, current, and output power of the power supply will periodically fluctuate with the pulse load. The root cause is that the system is a tight source-load coupling characteristic; There are switching devices in both the circuit breaker and the pulse load, making the circuit structure present a typical nonlinear

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