Abstract: The present invention provides a preparation method for a modified cathode of an MEC-AD system and application of the system with high efficiency and low energy consumption. A NiCo-BDC hydrothermal carbon composite MOF material is designed and used for modifying a cathode, which can remove COD more rapidly compared with traditional AD. A wind energy and light energy complementary power generation device is used for energy supply of the MEC-AD system, and energy consumption is further reduced by setting an intermittent power supply mode. The intermittent power supply achieves higher energy recovery efficiency while obtaining higher performance, can effectively reduce energy consumption of the MEC-AD system, is conducive to more convenient configuration of a power generation and energy supply device using clean energy, and has a good application prospect in reducing COD in organic wastewater with low energy consumption and high efficiency.

Abstract: The present invention discloses a Bipolar VSC-HVDC and UPFC Hybrid Topology and its operation method. The first control circuit includes a positive and a negative circuit at the series side, in which the VSC converter can operate in bipolar mode; the second control circuit includes a positive and a negative circuit, in which the VSC converter can operate in bipolar mode; the third control circuit is the same as the second control circuit in terms of structure; the positive electrode and negative electrode of the second control circuit are connected to the DC bus via a DC breaker respectively; the other end of the DC transmission line is connected to the third control circuit via a DC breaker.

Abstract: The present invention discloses a Bipolar VSC-HVDC and UPFC Hybrid Topology and its operation method. The first control circuit includes a positive and a negative circuit at the series side, in which the VSC converter can operate in bipolar mode; the second control circuit includes a positive and a negative circuit, in which the VSC converter can operate in bipolar mode; the third control circuit is the same as the second control circuit in terms of structure; the positive electrode and negative electrode of the second control circuit are connected to the DC bus via a DC breaker respectively; the other end of the DC transmission line is connected to the third control circuit via a DC breaker.