PROJECT CASE
Guangda Electric Is A Professional Organization Dedicated To Solving Power Quality Problems Of Users
Beijing Olympic Tram Passenger Transportation Branch
Background of the Harmonic Control Project for Electric Vehicle Equipment at the Beijing Olympic Games Electric Bus Company: The Electric Bus Company of Beijing Public Transport Holdings (Group) Co., Ltd. is located on Beichen Road in Chaoyang District. A new electric vehicle charging station has been established, with a newly installed power equipment capacity of 2903 kW (including chargers, elevators, water pumps, etc.) and optical equipment of 100 kW (including air conditioning, lighting, etc.), resulting in a total capacity of 3003 kVA. The main harmonic-producing equipment is the charger, with each unit rated at 9 kW, totaling 210 units, evenly distributed across two circuits. The charger converts alternating current (AC) to direct current (DC), and its harmonic characteristic is a 6-pulse waveform. Due to the presence of a rectification component (diode rectification), the charger will...
2025-02-13
Typical Case of Harmonic Management in Communication Equipment Room II: (Shanxi Changzhi Telecom) Project Background: In communication equipment rooms, UPS (Uninterruptible Power Supply) has become an indispensable device. The UPS can provide high-quality power with high voltage regulation accuracy, stable frequency, and low waveform distortion to the load. Additionally, it can ensure uninterrupted power supply during static bypass switching. However, since the UPS is a nonlinear load, it generates a large amount of current harmonics, which not only causes harmonic pollution to the power grid but also affects other sensitive equipment in the equipment room, causing significant interference or even harm to the communication system. Therefore, all communication equipment rooms must address the issue of harmonic management.
2025-02-13
Beijing Gaobeidian Wastewater Treatment Plant
Typical Case of Harmonic Control in Wastewater Treatment Plant (Beijing Gaobeidian Wastewater Treatment Plant)\n\nProject Background: The substation load of a certain wastewater treatment plant is mainly composed of 21 frequency converters, which drive corresponding electric motors. The power distribution is as follows: 7 units of 37kW, 7 units of 2.2kW, and 7 units of 1.5kW. Each three units form a group, totaling 7 groups, with each group consisting of 1 unit of 37kW, 1 unit of 2.2kW, and 1 unit of 1.5kW. The system can operate a maximum of three groups simultaneously. Since all loads are frequency converters, they are a significant source of harmonics, leading to severe harmonic pollution and interference in the system.
2025-02-13
Anshan Zhongyou Tianbao Steel Pipe Co., Ltd.
Typical Case of Harmonic Control in Steel Pipe Factory (Anshan Zhongyou Tianbao Steel Pipe Co., Ltd.) Project Background: The main technical parameters of the equipment in the steel pipe factory production workshop are as follows: 1. The power transformers are of the S9 series, with capacities of 1250 kVA and 2000 kVA, primary voltage of 10 kV, and secondary voltage of 0.4 kV. 2. The transformer connection method is Y/Y0. 3. The load of the 1250 kVA transformer consists of two 600 kW medium-frequency heating power supplies, with the main connection using a thyristor three-phase bridge rectifier; fast thyristor single-phase bridge inverter; the energy storage component is a reactor; and the output power frequency is 2.5 kHz. 4. The 200...
2025-02-13
Qinhuangdao Boye Glass Co., Ltd.
Typical Case of Harmonic Control in Glass Factory (Qinhuangdao Boye Glass Co., Ltd.) Project Background: A certain glass 10kV distribution station currently has one transformer with a capacity of 1000kVA, 10kV/0.4kV. The main electrical load is general AC loads, with a high-power variable frequency drive used only during the air-cooled cooling of the glass. After the glass is output from the tempering furnace, the fan starts to operate, and this process continues in a cycle. During the operation of the fan, the current distortion in the power grid is very high. Control Plan: Based on the comprehensive consideration of on-site test data, an active power filter model SPA3-100/0.4 was selected.
2025-02-13
Typical Case of Active Filtering - Case Twelve
Harmonic Mitigation Plan for Oil Fields: Project Background: The main loads in the oil field are mud pumps and drilling equipment with speed control devices. Since the speed control devices are nonlinear loads, they inevitably cause serious voltage and current distortion, which often leads to errors or inaccuracies in the data recorded by the logging instruments. Therefore, our company conducted on-site data testing for the 50DB and 70DB power supply systems of Daqing Oilfield, the 50DB and 70DB power supply systems of the Shaanxi North Changqing Oilfield, and the 90DB power supply system of Karamay Oilfield in Xinjiang. Data analysis revealed that the serious power quality issues were caused by the mud pumps and drilling equipment during their operation, resulting in...
2025-02-13
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Guangdong Guangda Electric Co. Ltd.
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