| Regional integrated energy system(RIES)has been developed rapidly in order to increase the penetration rate of renewable energy.RIES is characterized by multi-device coupling,which not only can realize multi-energy coordination and improve its comprehensive benefits,but also enables it to handle faults by coordinating equipment output.Energy storages have fast response and wide adjustable range,which are expected to play a vital role in the energy supply fault handling of RIES.At present,there is still a lack of systematic and effective method for energy supply fault handling of RIES.In this paper,such a method is systematically studied for RIES energy supply failure considering the cooperation of energy storages.The main works of this paper are as follows:(1)The models of RIES are analyzed and established.The models of energy generators and energy storages are established by the quasi-steady state model.The multi-energy coupling model of the system is established by using the general busbar modeling method.The power flow model and the thermal(cold)flow model are established respectively by using the bus injection model and the branch flow model.The classified load model is established,including low value interruptible load,high value interruptible load and non-interruptible load.(2)The operating mechanism of energy generators in RIES under fault conditions is analyzed.This paper studies the response of typical equipment to the power gap between supply and demand during fault handling.The concept of energy supply response time is proposed taking into account the response time of equipment and transmission delay of pipeline network,and the calculation method of correlative interval value is given.Four levels of energy supply response time ranges are divided for typical equipment.This paper studies the influence of typical equipment failure on system energy supply,and the value of energy supply importance of typical equipment is calculated.(3)The operating mechanism of energy storages in RIES under fault conditions is analyzed.Based on the operating characteristics of energy storages,the feasibility of the application of cooling/heat/electricity storages in emergency treatment of faults is demonstrated,a location and capacity planning method considering fault handling requirements is presented for the configuration of energy storages.Based on the historical data of the studied park,the specific location and capacity allocation of the heat storage is proposed.(4)In this paper,an energy supply fault handling method of RIES is studied considering the cooperation of energy storages.Based on the classified load model,a fault classification method according to the relationship between system output power and load power thresholds is given,which divides fault scenarios into mild fault,moderate fault and severe fault.Three kinds of differentiated fault handling strategies are presented aiming at different fault scenarios.Based on operating cost and load removal,a multi-objective fault handling planning model is proposed.Then,its application is simulated in three typical failure scenarios of RIES,and the results show that the fault recovery time of three cases is shortened by 83.3%,91.7% and 12.5% respectively,and the economic loss is reduced by 4.2%,47.2% and 24.6% respectively.The fault handling method is verified to be able to realize the fast faut recovery,and effectively improve operation economy and energy supply reliability of RIES. |
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