基于综合建模的3类电池储能电站性能对比分析

新型蓄电池的诸多特点使其十分适用于平抑变化频繁且剧烈的功率波动,例如可再生能源的输出功率。如今较有前景的新型电池储能技术有锂电池、钠硫电池和液流电池。为比较研究以这些电池为储能介质的电池储能电站的性能,文中建立了新型电池储能电站的综合兼容性模型,并对不同电池的特性加以区别描述,体现了差别。在一次投资费用相近的基础上,通...     

Integrated battery controller for distributed energy system

In this article, an improved integrated battery energy storage system (BESS) controller for distributed energy system is presented. The BESS is integrated in parallel with the full wave bridge converter into the distributed energy system network. In a normal operating mode, the BESS serves as a power conditioner as well as an active power filter in a distributed power system network. This work presents BESS controller which is designed for regulating the state of charge of the batteries and also to manage the active power in a distributed power system network. The off peak load energy is used to recover the batteries’ state of charge through the BESS controller. In this BESS controller, the constant current-constant voltage (CC-CV) mode is used and it helps to keep the batteries’ state of charge conditions for improving the reliability of the distributed power system system. This control strategy is incorporated into the main converter. The controller helps in managing the phase, amplitude and waveform of the current and voltage on the distributed power system network. The controller ensures the power quality and also assists in improving the power factor with respect to the utility for the intermittent distributed generation as well as the load. In this article, the test results of a prototype system are presented, which validates the proposed controller strategy of BESS in a distributed power system network.     

Buffer scheme with battery energy storage capability for enhancement of network transient stability and load ride-through

This paper examines a buffer scheme to mitigate the negative impacts of power-conditioned loads on network voltage and transient stabilities. The scheme is based on the use of battery energy-storage systems in the buffers. The storage systems ensure that protected loads downstream of the buffers can ride through upstream voltage sags and swells. Also, by controlling the buffers to operate in either constant impedance or constant power modes, power is absorbed or injected by the storage systems. The scheme thereby regulates the rotor-angle deviations of generators and enhances network transient stability. A computational method is described in which the capacity of the storage systems is determined to achieve simultaneously the above dual objectives of load ride-through and stability enhancement. The efficacy of the resulting scheme is demonstrated through numerical examples.     

Coordinated operation of a battery energy storage system and thermal generators for supply–demand balance maintenance and efficient use of photovoltaic energy

In future power systems with extremely large integration of photovoltaic (PV) generation, it is necessary to not only properly maintain supply–demand balance without power shortfall but also utilize as much PV energy as possible. The application of PV power forecast and energy storage devices to power system operation is necessary. In this study, we propose a method for determining and modifying the charging and discharging schedule of a battery energy storage system (BESS) and the unit commitment of thermal generators based on the PV power forecast. The proposed method is evaluated by numerical simulations for one year. The results show that both the energy shortfall and PV curtailment can be reduced by the proposed method.     

带蓄电池储能系统的DSTATCOM有功无功联合优化控制

蓄电池储能系统接入配电网静止同步补偿器(B-DSTATCOM)进行有功无功联合控制可有效缓解高波动性分布式电源大量接入配电网导致的电压越限、网损加重、三相不平衡度增加等系列问题。对此,文中提出一种计及光伏发电的不平衡主动配电网B-DSTATCOM实时有功无功联合优化控制策略。首先,对B-DSTATCOM四象限运行原理进行研究,在此基础上以电压偏移、网损、电压不平衡度及运行成本为子目标函数建立B-DSTATCOM实时有功无功联合多目标优化控制模型,并采用加权求和法、改进粒子群优化及直接潮流法求得最优控制方案。最后,基于澳大利亚某实际含光伏低压不平衡配电网进行MATLAB仿真,验证所提方法及模型的有效性、实用性和鲁棒性。     

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。     

储能电池荷电状态与平抑风电出力波动协调运行策略

采用电池储能系统(battery energy storage system,BESS)平滑风电功率波动可以优化风电场出力特性,提高风电场输出功率的稳定性。为了延长BESS的使用寿命,需最大限度控制BESS的荷电状态(state of charge,SOC)在限定区间内,以便拥有足够的容量进行下一时刻的充放电动作,从而带来更好的平滑效果。为此,提出了一种运行策略,该策略由2种控制算法组成,系统运行时,根据风电功率波动量的大小决定采用何种算法,2种算法依据风电场实际运行状况相互切换。仿真结果表明,该策略与传统低通滤波相比,不仅拥有较好的平抑效果,还能让BESS的SOC在合理的区间内,从而延长了BESS的使用寿命,节约了储能投资成本。     

大容量电池储能系统实时数字仿真测试技术研究

为了全面测试南方电网公司自主研发即将在深圳投运的大容量电池储能系统,在深入了解大容量电池储能系统控制策略、保护功能及高级应用功能的基础上,对大容量电池储能系统实时数字仿真（RTDS）测试关键技术进行了研究。结果显示：大容量电池储能系统的RTDS测试的技术难点主要在于测试方案研究、建模规模评估及具体的系统建模等;蓄电池组及PCS部分建模是大容量电池储能系统的RTDS测试平台构建的关键环节;所建议的模型能反映大容量电池储能系统的RTDS控制特性,可对其功能及动态特性进行试验研究及验证。     

多点电池储能系统参与电网二次调频的控制策略

“双碳”能源革命背景下，大规模可再生能源的加速并网加剧了电力系统对于快速调频资源需求的迫切性，以电池储能系统（BESS）为代表的新型快速资源为电网自动发电控制(AGC)提供了有效手段。首先，为满足电网各类型调频资源在AGC系统中的接入监视与分类决策需求，提出 “域-群-机”三级控制模型架构；然后，从BESS的SOC主动管理出发分别提出了基于改进的动态调频容量(DAA)的多元集群协同控制策略，及引入SOC影响因子的多点BESS功率分配策略；最后,结合实际电网的持续扰动工况及模拟跳机扰动工况进行仿真分析，表明本文所提控制策略不仅能够提升电网调频品质，而且可以显著改善各单点BESS的SOC一致性。