Accurate Circuit Model for SteadyState and Dynaic 稳态与动态的精确的电路模型

1、w. peng, student member, ieeey. baghzouz, senior member, ieeedepartment of electrical & computer engineeringuniversity of nevada, las vegas (usa)the international conference & utility exhibition 201128-30 september 2011 pattaya city, thailand*need for battery models*typical battery discharge

2、 curves*derivation of steady-state circuit model from manufacturer data*steady-state model verification *derivation of dynamic circuit model from laboratory tests data and verification.*conclusion*energy storage on the electric power system is becoming an increasingly important tool in *managing the

3、 integration of large-scale, intermittent solar and wind generation. *shaping the load curve (peak shaving and valley filling) *smart grid designs that call for additional distribution automation and sophistication such as islanding.*energy storage in the automotive industry is also becoming importa

4、nt due to the proliferation of hybrid-electric and pure-electric vehicles.*there are many types of batteries, each of which has advantages and disadvantages:*the absorbed-glass-mat (agm) battery - a type of valve-regulated-lead-acid (vrla) battery that is widely popular in renewable energy storage s

5、ystems due to its high performance and maintenance-free requirement is analyzed in this study. 3.7 a0.75 a89 a*rs: total resistance (copper and electrolytic) dependent on rate of discharge.*vs: equivalent voltage source dependent on rate of discharge and dod (or soc).*vs can be replaced by an equiva

6、lent capacitance cs. the relation between these two is:isosscitvv/,*best curve fit:21asiar*best curve fit:543)()()(adodifaififanccsiaaif76)(8hr 9.8 a4hr 18.25 a*equivalent resistance split into parts:*total voltage drop due to sudden draw of current i (starting from rest): ttonttsdropcreirirvon),1 (

7、/tssrrrsudden voltage dropexponential voltage dropstatic componentdynamic component the time constants at turn-on and turn-off are different.current pulse (a)2015105(1-k)rs ()0.0220.0230.0230.024krs ()0.0120.0130.0140.015rs ()0.0330.0360.0370.039on (sec)14151720off (sec)9698100101*a circuit model fo

8、r an agm lead-acid battery was developed for steady-state and transient conditions: *the steady-state model (which consists of two dependent circuit parameters) was derived from the discharge curves provided by the manufacturer. *the dynamic model was obtained by adding a capacitive element across a portion of the series resistance, and the parameter values were obtained from laboratory tests. *the resulting circuit model is found to predict battery performance under both constant as well as variable current discharge with sufficient accuracy.*the tests in this study were conducted indoors