A Variable Speed Pumped Storage System Based on Droop-Fed Vector Control Strategy for Grid Frequency and AC-Bus Voltage Stability
Abstract
:1. Introduction
2. Materials and Methods
2.1. Basic Concepts of Droop Vector Control System
2.1.1. The Vector Control
2.1.2. The Droop Control
2.2. The Proposed System Modelling
2.3. Machine and Converter Modelling
2.4. Control Modelling in MATLAB Platform for Dynamic and Steady State Analysis
2.5. Control of Active and Reactive Power for Rotor Side Converter
2.5.1. Active Power Control
2.5.2. Reactive Power Control
2.6. Control of Active and Reactive Power for Grid Side Converter
2.7. Measuring and Estimation of the Grid Frequency
2.8. Voltage Modulation and Converter Reference Voltage
2.9. Case Study and Simulation Model
3. Results and Discussions
3.1. VSPS Grid-Integrated Network Simulation and Implications for Regulating Grid Frequency and AC-Bus Voltage in Case of Contingencies
3.2. Comparison of the Proposed Control Scheme with the Conventional Strategy
3.2.1. Grid Frequency Control and Response
3.2.2. AC-Bus Voltage Control and Response
3.3. The Frequency and AC Voltage Control and Response During Load Variations
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
- A VSC DFIM based VSPS plant; turbine rating = 300 MW; rated hydraulic head=165 m; piping area = 11.15 m2; gate opening at no load = 0.06 pu and at full load = 0.94 pu; base value is taken as a power of 333 MVA and a voltage of 220 kV
- -
- power capacity = 333 MVA/18 kV, stator resistance and leakage inductance Rs = 0.0086 pu and Lls = 0.152 pu, rotor resistance and leakage inductance Rr = 0.007 pu and Llr = 0.187 pu, magnetization inductance Lm = 300 pu, inertia constant, friction factor, and pairs of poles H(s) = 10.6, f(pu) = 0.02 and p = 12
- -
- Converter rating = 66 MVA/38 kV DC voltage, the DC-link equivalent capacitance Ceq = 2 × 10−2 Farad, the coupling inductor resistance and inductance R = 0.0025 pu and L = 0.25 pu
- -
- The rotor side controllerCurrent loop gains (Pi = 1.25 and Ii = 15)Active power loop gains (Pp = 1.5 and Ip = 20)Reactive power loop gains (Pq = 0.3 and Iq = 5.5)Frequency droop constant (Kf = 90)AC voltage droop constant (Kac = 60)
- -
- The grid side controllerCurrent loop gains (Pig = 1.1 and Iig = 9)DC voltage loop gains (Pdc = 0.001 and Idc = 0.02)
- -
- Grid connecting transformer: capacity = 350 MVA, 18 kV/220 kV, winding parameters R1 = R2 = 0.0025 pu and L1 = L2 = 0.08 pu; magnetization resistance and inductance Rm = Lm = 500 pu
- Two hydropower plants (synchronous generator): each has a power capacity = 200 MVA, 13.8 kV; and grid connecting transformer capacity = 350 MVA, 13.8 kV/220 kV.
- A diesel power plant (synchronous generator): Power capacity = 15 MVA, 25 kV; grid connecting transformer capacity = 20 MVA, 25 kV/220 kV.
- A wind farm with induction generator: seven turbines 15 MW capacity each, 575 V; and grid connecting transformer capacity 12 MVA, 575 V/220 kV for each wind turbine
- Load = 630 MVA and the system frequency is 50 Hz.
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Bitew, G.T.; Han, M.; Mekonnen, S.A.; Simiyu, P. A Variable Speed Pumped Storage System Based on Droop-Fed Vector Control Strategy for Grid Frequency and AC-Bus Voltage Stability. Electronics 2018, 7, 108. https://doi.org/10.3390/electronics7070108
Bitew GT, Han M, Mekonnen SA, Simiyu P. A Variable Speed Pumped Storage System Based on Droop-Fed Vector Control Strategy for Grid Frequency and AC-Bus Voltage Stability. Electronics. 2018; 7(7):108. https://doi.org/10.3390/electronics7070108
Chicago/Turabian StyleBitew, Girmaw Teshager, Minxiao Han, Sifrash Amogne Mekonnen, and Patrobers Simiyu. 2018. "A Variable Speed Pumped Storage System Based on Droop-Fed Vector Control Strategy for Grid Frequency and AC-Bus Voltage Stability" Electronics 7, no. 7: 108. https://doi.org/10.3390/electronics7070108