Abstract
Based on the analysis of the principle and structure of a saturable reactor used in a converter valve of HVDC transmission, this paper analyzes its power loss composition and summarizes and derives the power loss equations. According to finite element analysis, the saturable reactor is modeled, its transient electromagnetic characteristics are simulated, and the core loss density distribution is studied. The influence of the cooling circuit and air on the heat dissipation of the saturable reactor is studied. The power loss density obtained by the electromagnetic field finite element analysis is mapped as the heat source to the finite fluid element for thermal simulation in order to obtain the spatial temperature distribution of the saturable reactor. The maximum temperature of the case is about 68.5°C, while the maximum temperature of the iron core is about 87.9°C. The converter valve operation test validates the accuracy of the heat dissipation analysis and temperature field simulation. The research results can serve as a reference for the design of saturable reactors used in converter valves.
Highlights
The converter valve is an essential part of HVDC transmission project to achieve AC/DC and DC/AC power conversion [1]
6nr 2 N 2 AFe2 π ( 3 Udio sin φ )2 (8). It can be seen from equation (8) that the eddy current loss of the saturable reactor is related to the iron core design, the number of reactors in a single valve, and the steady-state operating conditions of the converter valve
TEMPERATURE FIELD SIMULATION In order to study the spatial temperature distribution of the saturable reactor and iron cores, the power loss density obtained through the electromagnetic field finite element analysis is applied as the heat source input of the thermal simulation software
Summary
The converter valve is an essential part of HVDC transmission project to achieve AC/DC and DC/AC power conversion [1]. Studying the power losses, heat dissipation, and temperature distribution of the saturable reactor under rated conditions is vital to ensure the converter valve's long-term reliable and stable operation. Research on the power losses of saturable reactors mainly focus on circuit simulation and thermal simulation with reactor modeling, or alternatively, by measuring the core temperature with pre-embedded optical fiber sensors and obtaining the reactor core losses through data fitting. These methods are not sufficient to complete the theoretical derivation and calculation of core losses as neither sufficiently considers the theoretical derivation and quantification of air heat dissipation of the reactor in actual operation. The research results of this paper could provide a reference for the design of a saturable reactor
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