Direct-current microgrid impedance detection system and impedance detection method
A DC micro-grid and impedance detection technology, applied in the electric power field, can solve problems such as negative damping, system damping reduction, and influence on the operating characteristics and behavior of the DC distribution network, and achieve the effect of eliminating the impact and accurate detection results
Active Publication Date: 2020-04-10
SHANGHAI KELIANG INFORMATION ENG
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But at the same time, the nonlinear control characteristics of power electronic devices also profoundly affect the operating characteristics and behavior of the DC distribution network.
[0003] The inventors of the present invention found that because the power electronic equipment controls a large number of power devices to turn on / off quickly, the DC microgrid exhibits different impedance characteristics at different frequencies, especially when the current compound increases and the number of interconnection ports increases, the system The damping decreases, and even negative damping occurs, which affects the stable operation of the DC microgrid. Therefore, how to accurately and effectively obtain the impedance characteristics of the DC microgrid at different frequencies becomes the key to analyzing the stability of the DC microgrid system.
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[0026] At present, there is no impedance testing method for DC microgrid. Generally, only the full digital simulation model of a single power electronic device is used for impedance scanning or the primary power loop model of a single power electronic device is placed in the simulator and an external real secondary controller. Docking, impedance scanning based on the controller hardware in the loop, did not perform impedance testing for the actual operating DC microgrid.
[0027] In order to solve the above problem, the present invention provides a DC microgrid impedance detection system, which can make the DC bus voltage of the voltage source converter have multiple frequencies, so that the conduction signal of the power switch tube in the voltage source converter has The corresponding frequency will cause the current and voltage of the DC grid-connected point to fluctuate accordingly, so as to obtain the impedance characteristics of the DC microgrid at different frequencies. ...
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The embodiment of the invention provides a direct-current (DC) microgrid impedance detection system and an impedance detection method. The DC microgrid impedance detection system comprises: a DC microgrid and a voltage source converter, wherein the DC microgrid is connected in parallel to the voltage source converter through DC grid connection points at two ends; a controller, which is connected to the voltage source converter, and is used for controlling the DC bus voltage of the voltage source converter so as to endow the DC bus voltage with a plurality of frequencies; and a data processor,which is connected to the DC grid connection points, and is used for detecting the voltage and current of the DC grid connection points so as to acquire the impedance of the DC grid connection points.According to the invention, the DC bus voltage is endowed with a plurality of frequencies, and the impedance characteristics of the DC microgrid under different frequencies are tested.
Description
technical field [0001] Embodiments of the present invention relate to the field of electric power, and in particular to a DC microgrid impedance detection system and an impedance detection method. Background technique [0002] The nonlinear control of power electronic conversion equipment such as distributed power generation, energy storage, and AC-DC loads in DC microgrids is conducive to rapid response to changes in load and power supply, increasing system flexibility and improving system operating efficiency. But at the same time, the nonlinear control characteristics of power electronic devices also profoundly affect the operating characteristics and behavior of DC distribution network. [0003] The inventors of the present invention found that because the power electronic equipment controls a large number of power devices to turn on / off quickly, the DC microgrid exhibits different impedance characteristics at different frequencies, especially when the current compound i...
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IPC IPC(8): G01R27/08H02J1/10
CPCG01R27/08H02J1/10
Inventor 郑飞郜登科邹毅军桑苏明
Owner SHANGHAI KELIANG INFORMATION ENG