Design And Implementation Of Automatic Voltage Control System For Offshore Oil Platform Microgrid

The development of offshore oil platforms reflects the strength of a country's offshore oil exploration,while the development of offshore oil platform power systems represents the development of offshore oil platforms to some extent.As a typical micro-grid system,the offshore oil platform power system is far away from the land without support of the land national power grid system.As a result the independent power generation is adopted for each platform to meet the power need for production.With the development of power grid technology,the power supply mode of current offshore oil platform grid has gradually transformed from single-platform power supply to multi-platform combined power supply mode.The extensive power management mode not only lead to less safety of the power system but also increases the operating cost.In addition,the change of the power supply mode also puts forward new requirements for the power system control mode of offshore oil platform.This paper develops a set of offshore power platform micro-grid automatic voltage control system(AVC-Automatic Voltage Control)for offshore oil platform power system,which is utilized to realize the purpose like achieving stable offshore platform grid voltage,improving power factor,reducing system network loss etc.through model drawing,dynamic data management,topology analysis,load flow calculation,optimized computing control etc.The micro-grid automatic voltage control system of offshore oil platforms is a comprehensive embodiment of many discipline technologies such as modern detection technology,communication technology,control theory and computer technology etc..The corresponding power grid automatic voltage control system on the road is widely utilized in the land power grid,which fully proves the reliability of the system.Therefore,the design of this system is applied to the offshore oil platform micro-grid.With appropriate corresponding improvements to maintain the grid voltage stability,enhance the reactive power optimization capability and reduce the line loss,thus lead to overall improvement of the offshore oil platform micro-grid intelligent level.The design of the micro-grid automatic voltage control system for offshore oil platforms is divided into hardware part and software part.This paper focuses on the software part design.Among them,the hardware part adopts the PMS(Power Management System)system of Shanghai Emerson Process Control Co.,Ltd.,and the corresponding PLC(Programmable Logic Controller)equipment.The software part includes the corresponding optimization algorithms,and functional modules design.The highlight of this system is that the optimization algorithm is closely integrated with the control strategy,and a set of efficient optimization control processes is formed.Before carrying out optimization control,power flow verification is carried out first to ensure correct data and correct operation state of power grid.After the verification of power flow,particle swarm optimization algorithm is applied to ensure the optimal "safe" range of voltage and reactive power when both voltage and reactive power are normal.When the voltage or reactive power exceeds the limit,the economic differential pressure method is applied to quickly pull the out-of-limit parameter(voltage or reactive power)back into the limit value,and then the particle swarm optimization algorithm is applied to adjust the voltage or reactive power again to make it in the optimal "safe" zone.At the end of the paper,the integrity and effectiveness of the system functions are verified by on-site commissioning and application of the system in Platform B and G District 139 of Penglai,Bohai.