Hangzhou Electric Power has applied for a patent for a power quality controller structure for photovoltaic compensation of the DC bus. This invention aims to ensure effective compensation of the energy on the DC bus during both grid-connected and island modes.
On March 22, 2025, it was reported by Jinrongjie that the National Intellectual Property Administration of China has received an application from Hangzhou Electric Equipment Manufacturing Co., Ltd. for a patent titled “Power Quality Controller Structure for Photovoltaic Compensation of the DC Bus“, with the publication number CN 119651793 A and an application date of November 2024.
The patent summary reveals that this invention discloses a structure for a power quality controller that compensates for the DC bus in photovoltaic systems. The new topology integrates photovoltaic generation with the DC bus to stabilize its voltage, leading to the development of a novel UPQC (Unified Power Quality Conditioner) topology. This topology introduces two photovoltaic modules, PV1 and PV2. PV1 is connected in parallel to the load side of the distribution network, providing energy to AC loads, while PV2 connects to the DC bus side through a boost module, directly charging the DC bus capacitor. This setup provides the energy needed for voltage compensation by the SAPF (Static Active Power Filter) and supplies power to AC loads during power outages through the PAPF (Passive Active Power Filter).
The beneficial effect of this invention is to ensure the effective compensation of the energy on the DC bus during both grid-connected and islanding states.
According to Tianyancha, Hangzhou Electric Equipment Manufacturing Co., Ltd. was established in 2005 and is located in Hangzhou. The company primarily engages in the manufacturing of electrical machinery and equipment. It has a registered capital of 121,945 million RMB and has invested in five companies. The company has participated in 749 bidding projects and holds 32 trademark registrations as well as 888 patent filings. Additionally, it possesses 18 administrative licenses.
