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Abstract
Installing a power system voltage regulator (PSVR) on the condenser can enhance the dynamic voltage control capability of the local high-voltage bus voltage, but there are still few studies on the optimization of PSVR parameters. The dynamic model of the condenser is built to determine the analytical expression between the system voltage disturbance and the change of the control target, and the influence trend of PSVR on the dynamic voltage characteristics of the condenser is analyzed. Furthermore, in the MATLAB/Simulink environment, a PSVR-containing condenser model is built, and a quantitative index for evaluating the phase-frequency characteristics of the condenser is proposed. Based on this index, the PSVR time constant is optimized through the simulation of the dynamic voltage characteristics of the condenser, and using eigenvalue root locus method combined with dynamic simulation to coordinate PSVR gain coefficient, achieve PSVR parameter optimization. The simulation results under the single-machine and three-machine systems show that after the PSVR parameter optimization, the voltage oscillation mode of the condenser is effectively improved.
Highlights
Synchronous condensers can provide reactive power support in the event of system failures, inhibit DC receiving end commutation failure, and have good reactive power output and transient voltage response characteristics, so they have been widely used in UHV DC transmission systems[1,2,3,4]
power system voltage regulator (PSVR) introduces the generator high-voltage side voltage to participate in the automatic voltage excitation regulator (Automatic Voltage Regulator, AVR) control, it can keep the bus voltage on the high-voltage side of the main transformer of the condenser at a higher level, which can further improve the dynamic voltage characteristics of the condenser
According to the expression of the dynamic voltage characteristics of the condenser, build a condenser dynamic model based on MATLAB/Simulink tools, obtain the amplitude-frequency phase-frequency characteristic curve between the high-voltage bus voltage and the infinite bus voltage before and after the PSVR is installed, and propose a measure of the phasefrequency characteristic The index of the degree of phase shift, with the goal of minimizing the proposed index, adjust the lead/lag time constant.The smaller the phase shift, the smaller the impact on the power angle stability
Summary
Synchronous condensers can provide reactive power support in the event of system failures, inhibit DC receiving end commutation failure, and have good reactive power output and transient voltage response characteristics, so they have been widely used in UHV DC transmission systems[1,2,3,4]. PSVR introduces the generator high-voltage side voltage to participate in the automatic voltage excitation regulator (Automatic Voltage Regulator, AVR) control, it can keep the bus voltage on the high-voltage side of the main transformer of the condenser at a higher level, which can further improve the dynamic voltage characteristics of the condenser. This article proposes a method to optimize PSVR parameters based on the dynamic voltage characteristics of the condenser. In the MATLAB/Simulink environment, a single-machine infinity and a three-machine system are built, an index to measure the phase shift of the dynamic voltage characteristics of the condenser is proposed, the lead/lag time constant is optimized, and the eigenvalue root locus method is used to coordinate the gain coefficient.
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