考虑储能电池参与一次调频技术经济模型的容量配置方法

规模间歇电源并网引起的电网频率问题,导致对引入储能辅助调频的研究越发迫切。提出一种考虑储能电池参与一次调频技术经济模型的容量配置方法。阐述了储能电池功率和容量设计的通用方法;通过分析储能电池在调频运行过程中的成本和效益,基于全寿命周期理论,运用净现值法结合仿真模型构建储能电池参与一次调频的技术经济模型;设计了一种储能电池参与一次调频的充放电策略,在此基础上,考虑受风电出力波动影响的电网综合负荷,从与之对应的电网频率信号波动特性出发,在确定的电网调频及储能电池运行要求约束下,得出调频效果最优、经济性最优以及两者综合最优目标下的储能电池容量配置方案。仿真结果表明了该方法的合理性及有效性。本研究有助于推动储能电池在辅助调频服务上的示范与工程化应用。     

电池储能型模块化多电平变换器的混合模型预测控制方法

将模块化多电平变换器(MMC)作为电池储能系统(BESS)的并网变换器,可在实现高压并网的同时兼具控制的灵活性。针对电池储能型模块化多电平变换(B-MMC)系统,提出一种可有效减小计算量的混合型模型预测控制(H-MPC)方法。该H-MPC方法由PI控制和MPC组成。其中,PI控制部分用于求取满足交流电流输出和环流控制要求的子模块接入个数;MPC则负责共模电压(CMV)抑制,对子模块接入个数进行适当调整。结合子模块接入个数与电池组荷电状态(SOC)的排序结果,即可产生具体开关信号。针对不同应用场合,PI控制部分和MPC的控制目标选取要更为灵活。以环流控制为例,对其包含于MPC部分的情况进行简要分析。最后通过Matlab/Simulink仿真和实验,验证了该方法的正确性与有效性。     

利用含储能装置的STATCOM阻尼电力系统多模态振荡

研究了多机系统中使用储能装置与静止无功发生器(STATCOM)的集成抑制电力系统多模态振荡的可行性。推导了集成电池储能系统(BESS)的STATCOM的非线性动态模型和线性化Phillips-Heffron模型。利用STATC0M/BESS能够和系统自由交换有功功率和无功功率的特点,在每个控制回路上设计附加阻尼控制器阻尼多模态振荡。基于可控性指标确定STATCOM/BESS的安装地点并为各模态选择控制回路,使用人工鱼群算法进行多个阻尼控制器间的协调优化。仿真结果表明,单个STATCOM/BESS能够成功实现电力系统多模态振荡的抑制;阻尼效果受容量限制的影响,容量大时阻尼效果好。     

大容量链式电池储能功率调节系统控制策略

大容量链式电池储能系统(battery energy storagesystem,BESS)是解决风力发电等可再生能源发电大规模并网问题的有效手段之一。针对BESS的功率调节系统(powerconditioning system,PCS)控制策略,在α-β静止坐标系下应用比例谐振(proportional resonant,PR)调节器实现瞬时功率无静差控制;通过注入零序电压实现相簇间荷电状态(stateof charge,SOC)均衡控制,并通过在各级联单元叠加相应交流电压实现相簇内各单元SOC均衡。仿真结果表明,采用该控制策略的PCS进行瞬时功率控制时具有较快的动态响应速度和较小的稳态误差,同时能有效实现SOC均衡控制,验证了该控制策略的正确性和可行性。     

Application of STATCOM/BESS for wind power smoothening and hydrogen generation

This paper proposes static synchronous compensator (STATCOM) incorporated with battery energy storage system (STATCOM/BESS) to smooth the line power of wind farm consists of fixed-speed wind generators. Constant output power reference is not a good choice because there may be some cases where wind speed is very low and then sufficient power cannot be obtained. In that case, energy storage device can solve the problem but large energy capacity may be needed. This paper proposes exponential moving average (EMA) to generate the reference output power, and thus the energy capacity of BESS unit can be small. Another salient feature of this study is the generation of hydrogen by using wind energy. At the wind farm terminal, two topologies of hydrogen generators are considered to be connected and their merits and demerits are analyzed. Finally, by taking the advantage of STATCOM/BESS, simple hydrogen generator topology composed of rectifier and electrolyzer is proposed. Detailed modeling and control strategy of hydrogen generator and STATCOM/BESS topologies are discussed and a cooperative control is developed. The effectiveness of the proposed system is verified by the simulation analysis using PSCAD/EMTDC.     

不对称短路故障下电池储能影响交流系统短路电流机理及算法

电池储能系统(BESS)在国内外电力系统中已得到快速发展和广泛应用,但对BESS影响短路电流机理认识尚不深入,且现有短路电流计算标准均未涉及交流系统发生不对称短路故障时考虑BESS影响的短路电流计算方法.基于BESS电磁暂态模型,分析不对称短路故障下BESS电压源换流器(VSC)外环控制器控制方式、VSC外环控制器限幅...     

大型蓄电池储能系统接入微电网方式及控制策略

由于风能的波动和负荷的扰动,特别是在孤网运行且风能穿透比较高（或风机停机）时,微电网需要大型储能系统来保证系统电能的稳定性。提出了大型蓄电池储能系统接入的实现形式及其控制策略,分析了蓄电池的特性及功率调节器的工作原理,建立了系统仿真模型,并设计、开发了容量为100kW的实验样机。仿真和实验结果表明,在不同带载情况下,该...     

Analysis of voltage stability uncertaintyusing stochastic response surface methodrelated to wind farm correlation

Recent advances in battery energy storage technologies enable increasing number of photovoltaic-battery energy storage systems (PV-BESS) to be deployed and connected with current power grids. The reliable and efficient utilization of BESS imposes an obvious technical challenge which needs to be urgently addressed. In this paper, the optimal operation of PV-BESS based power plant is investigated. The operational scenarios are firstly partitioned using a self-organizing map (SOM) clustering based approach. The revenue optimization model is adopted for the PV-BESS power plants to determine the optimal operational modes under typical conditions for a set of considerations, e.g. power generation revenue, assessing rewards/penalties as well as peak shaving/valley filling revenue. The solution is evaluated through a set of case studies, and the numerical result demonstrates the effectiveness of the suggested solution can optimally operate the BESS with the maximal revenue.     

面向经济评估的电池储能系统工况特征量嵌入性研究

储能系统的投资过程主要包括初始购置、运维和置换三个阶段,不同的应用工况将对电池储能系统的寿命衰减速率产生差异化影响,进而影响其成本投入过程,也是储能系统经济评估中的必要考虑因素。面向储能系统的经济性动态评估,首先定义温度、倍率、放电深度(Depth of Discharge, DOD)、充放电频次等作为储能工况特征量。基于工况特征量与电池寿命损耗之间的关联关系,建立了计及工况特征参量的储能系统出力模型和成本模型。基于全寿命周期成本模型(Life Cycle Cost, LCC)和遗传算法,分析了工况特征量在储能成本评估中考虑的必要性及其影响程度。最后,在平抑光伏波动和负荷侧削峰填谷两种工况下展开算例分析,验证了在储能规划过程中考虑工况特征量的必要性。该研究将为储能规划阶段的经济性评估提供理论依据与数据基础。