Accurate Circuit Model for Steady-State and Dynamic 稳态与动态的精确的电路模型ppt课件

1、W. Peng, Student Member, IEEEY. Baghzouz, Senior Member, IEEEDepartment of electrical & Computer engineeringUniversity of Nevada, Las Vegas (USA)Accurate Circuit Model for Steady-State and Dynamic Performance of Lead-Acid AGM BatteriesTHE INTERNATIONAL CONFERENCE & UTILITY EXHIBITION 201928-

2、30 September 2019 Pattaya City, Thailand*Overview*Need for battery models*Typical battery discharge 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*Need

3、 for Accurate Battery Models*Energy storage on the electric power system is becoming an increasingly important tool in *Managing the integration of large-scale, intermittent solar and wind generation. *Shaping the load curve (Peak shaving and valley filling) *Smart Grid designs that call for additio

4、nal distribution automation and sophistication such as islanding.*Energy storage in the automotive industry is also becoming important 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 Absorb

5、ed-Glass-Mat (AGM) battery - a type of Valve-Regulated-Lead-Acid (VRLA) battery that is widely popular in renewable energy storage systems due to its high performance and maintenance-free requirement is analyzed in this study. *Discharge Curves of 89 Ah, 12V AGM Battery(Source: Manufacturer Technica

6、l Manual)3.7 A0.75 A89 A*Simplified Steady-State Equivalent Circuit *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 equivalent capacitance Cs. The relation between

7、these two is:IsossCItVV/,*Equivalent Series Resistance*Best curve fit:21asIaR*Equivalent Capacitance*Best curve fit:543)()()(aDODIfaIfIfaNCCsIaaIf76)(*Discharge Curves at Various Rates(obtained from analytical model)*Laboratory Experiment setting*Three-Step Battery Charging*Comparison Between Measur

8、ed and Calculated Discharge Characteristics8HR 9.8 A4HR 18.25 A*Equivalent Dynamic Circuit Model*Equivalent resistance split into parts:*Total voltage drop due to sudden draw of current i (starting from rest): ttonttsdropCReiRiRVon),1 (/tssRRRSudden voltage dropExponential Voltage drop*Derivation of

9、 dynamic circuit parameters through measurementsStatic componentDynamic componentThe time constants at turn-on and turn-off are different.*Derivation of dynamic circuit parameters through measurementsCurrent Pulse (A)2015105(1-k)Rs ()0.0220.0230.0230.024kRs ()0.0120.0130.0140.015Rs ()0.0330.0360.037

10、0.039on (sec)14151720off (sec)9698100101 *Comparison Between Measured and Calculated Terminal Voltage under Non-uniform Current Discharge*Conclusion*A circuit model for an AGM Lead-acid battery was developed for steady-state and transient conditions: *The steady-state model (which consists of two de

11、pendent 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 tes