Research On Utilization Performance And Strategies Of Distributed Generation In Distribution Network

With the continuous increase in the number of distributed power sources,the impact of distributed generation on the local distribution network has become increasingly prominent.The existing distribution network has been difficult to meet the demand for reliable,high-quality,economical,and environmentally friendly electricity.Therefore,optimizing the utilization performance strategy of distributed generation and improving the utilization level of distributed generation are important research issues that need to be solved and improved in the development of sustainable clean energy.This paper focuses on the research distributed generation utilization performance and strategies in the distribution network.The problems existing when distributed power sources are connected to the distribution network are studied,and the impact of distributed power sources on the distribution network and its mechanism are analyzed.Different control and utilization strategies of distributed generation are analyzed,and different utilization strategies for distributed generation have been researched in depth including local control utilization strategies for distributed generation based on reactive power regulation and active power regulation,local control utilization strategies able to suppress reactive power oscillations andlow-cost accomodation strategy of distributed generation based on virtual power plant to improve the utilization capacity of distributed generation.The details are as follows:1)The influence of distributed generation on the local voltage of the distribution network is analyzed.Aiming at the voltage limit problem of the distributed power access point in the distribution network,local control utilization strategy based on reactive power regulation and active power regulation is proposed.the relationship between local reactive power control,local active power control and node voltage is analyzed,and a local control function with node voltage measurement value as the adjustment value is proposed,and the implementation method of local control utilization strategy is proposed,when the voltage exceeds the upper limit and lower limit and the voltage is within the limit.According to different local active power control and local reactive power control sequence adjustment,the strategy may make full use of distributed power output and reduce distributed power abandonment.The effectiveness of the proposed local control utilization strategy through simulation is verified.2)The possible reactive power oscillation problem caused by local control when distributed power sources are connected in the distribution network and its influence on the stability of the local control system are analyzed,and a local control and absorption strategy that can suppress reactive power oscillation is proposed.The damping coefficient and buffer coefficient are introduced,which can significantly affect the stability characteristics of the control system and prevent frequent actions of the local controller.A method for setting the damping coefficient and buffer coefficient based on the Monte Carlo simulation method is proposed,which is verified by simulation analysis.The proposed local control utilization strategy can suppress reactive power oscillation,improve the overall control performance of the local control system and multiple local control systems,and improve the utilization capacity of distributed generation.3)Aiming at the phenomenon of reactive power oscillation and power abandonment in the local control utilization strategy,a distributed generation coordinated control utilization strategy that can suppress reactive power oscillation is proposed.A coordinated control model of distribution network voltage is established,and with the goal of maximizing the amount of distributed generation electricity utilization,and considering constraints such as distributed power output limits,capacity limits,and node voltage limits,a distributed generation coordinated control utilization strategy is proposed.The proposed coordinated control utilization strategy is verified in simulation which can effectively suppress reactive power oscillation and reduce the power waste of distributed power generation.4)A low-cost utilization strategy for distributed generation based on virtual power plants is proposed.The study takes the local utilization of high-density urban solar energy as an example,analyzes the energy utilization structure of residents and low-cost user-side energy utilization strategies based on the theory of energy use hierarchy.The configuration controllable and uncontrollable power generation units in virtual power plants is proposed and a new solution for the clean energy utilization strategy in a wider dimension is provided.