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Research On Capacity Allocation Method And Control Strategy Of Energy Storage Battery Auxiliary Grid Frequency Modulation

Posted on:2019-09-12Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y ZhongFull Text:PDF
GTID:2382330545457384Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
To solve the growing demand for electricity,a large number of renewable energy sources such as wind power generation,photovoltaic power generation,and thermal energy are added to the power supply field.While solving the problem of power supply shortage,due to the characteristics of volatility and intermittency of the renewable energy generation system,and the inherent defects of the thermal power unit,the frequency quality of the power grid has been further impacted.At the same time,the traditional frequency modulation units still have problems such as insufficient frequency modulation capacity,poor frequency modulation effect,and high frequency modulation costs.In this context,how to maintain the stability of the grid frequency in an increasingly complex power system has become an important research topic in the current power system.The energy storage battery with fast and accurate response,and easy to change the direction of adjustment is becomeing an important means of assisting the power grid in frequency regulation.This paper is based on the analysis of the research status of grid frequency modulation and energy storage battery.Research on the problem of theory and technology of electrochemical battery energy storage applied in power grid auxiliary frequency modulation type selection,simulation model,capacity allocation,control strategy and other related theories.The main content of this article is as follows:Discusses the necessity and feasibility of energy storage battery participating in power system frequency modulation under the background of large scale grid connection of wind power and photovoltaic power.Analyze and compare the basic working principles and technical characteristics of various typical energy storage power.Provides fundamental basis for select the energy storage battery for power grid frequency modulation.Constructed the equivalent model of energy storage battery participating in frequency modulation.Explains how to configure energy storage batteriy's Capacity to participate in frequency modulation and built its optimization configuration modelCombine the advantages of virtual droop control and virtual inertia control in the primary frequency regulation of energy storage auxiliary thermal power units,an integrated control mode was proposed and an improved self-regulating energy storage control law was constructed.According to the state of energy storage SOC,its maximum charging and discharging power is smoothly corrected,and a load frequency response model is established to compare and analyze the proposed strategy.The results show that the proposed control strategy has obvious advantages in improving the frequency modulation effect.For secondary frequency modulation involved by energy storage auxiliary thermal power units,this paper analyzes the advantages and disadvantages of ACE control and ARR control respectively,and a coordinated control strategy for energy storage participation in secondary frequency regulation was proposed.The control strategy divides the energy storage into frequency modulation conditions and recovery conditions.The frequency modulation condition is based on the adaptive control of the energy storage SOC to smooth the output,and the recovery condition is based on the ultra-short-term load forecasting results for SOC adaptive recovery.The simulation results under continuous load disturbance conditions shows that the control strategy proposed in this paper has advantages in improving the frequency regulation effect of the system and improving the utilization ratio of the thermal power unit,and realizes the coordinated operation among the energy storage,thermal power generation unit and the power system.
Keywords/Search Tags:renewable energy, thermal power generator, frequency regulation, energy storage system, State of Charge, control strategy
PDF Full Text Request
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