Dear Editor,Local adaptation in organisms involves changes in morphological,physiological,and biochemical traits in response to diverse environmental conditions(Mai&Liao 2019;Giacomini et al.2022;Jiang et al.2023)...Dear Editor,Local adaptation in organisms involves changes in morphological,physiological,and biochemical traits in response to diverse environmental conditions(Mai&Liao 2019;Giacomini et al.2022;Jiang et al.2023).An organ,an important morphological trait in organisms,undergoes adaptive size adjustments in response to environmental factors(Liao et al.2022;Zamora-Camacho 2022).Typically,variations in organ size under diverse environments along geographic gradients are affected by factors such as food intake and oxygen fluctuations(Zhong et al.2017).The heart,a crucial organ in organisms,plays a vital role in assessing survival and fitness(Müller et al.2014).Significant variations in heart size exist both between and within species,with the Hesse’s rule stating that animals adapted to cold environments have a larger heart in relation to body weight than closely related species living in warm habitats(Hesse 1924).展开更多
随着清洁能源规模的不断扩大,可平滑电能输出的混合储能系统(hybrid energy storage system,HESS)逐渐受到广泛关注。双有源桥可实现电气隔离和软开关,常应用于HESS中。为拓宽电压增益范围并降低储能装置侧电流纹波,文中提出一种基于电...随着清洁能源规模的不断扩大,可平滑电能输出的混合储能系统(hybrid energy storage system,HESS)逐渐受到广泛关注。双有源桥可实现电气隔离和软开关,常应用于HESS中。为拓宽电压增益范围并降低储能装置侧电流纹波,文中提出一种基于电流源型双向谐振变换器的HESS拓扑。首先,给出变换器的拓扑及等效电路,分析其开关模态和工作原理,推导出等效电路模型、电压增益表达式及低压侧电流纹波特性。在此基础上,提出一种解耦控制策略,通过调节各储能装置侧全桥的占空比独立控制超级电容和蓄电池的传输功率,并根据功率分配指令动态调整各端口功率占比。仿真结果表明,所提系统能实现各开关管的零电压开通(zero voltage switching,ZVS),在负载切换和功率指令变化时均表现出快速的动态响应和良好的稳定性。展开更多
随着新能源装机规模与并网比例持续攀升,其固有的随机性与波动性导致电网频率偏差加剧、调节压力增大,严重威胁系统稳定性与安全经济运行。针对这一问题,提出一种计及储能响应特性与风功率波动平抑需求的混合储能系统(hybrid energy sto...随着新能源装机规模与并网比例持续攀升,其固有的随机性与波动性导致电网频率偏差加剧、调节压力增大,严重威胁系统稳定性与安全经济运行。针对这一问题,提出一种计及储能响应特性与风功率波动平抑需求的混合储能系统(hybrid energy storage system,HESS)容量优化配置策略。该方法采用先进绝热压缩空气储能(advanced adiabatic compressed air energy storage,AA-CAES)与电化学储能组成HESS。首先,将HESS的输入功率通过变分模态分解(variational mode decomposition,VMD)算法进行分解,为降低模态混叠对功率分解精确度的影响,使用差分进化(differential evolution,DE)算法对VMD算法的参数进行优化;其次,结合AA-CAES的响应速度划分初步分配边界,进一步以HESS综合成本最小为目标对HESS功率进行二次分配;最后,通过算例仿真对所提方法进行验证。结果表明:所提方法能够降低功率分解过程中产生的模态混叠,同时实现风功率在不同储能系统之间的合理分配,结合不同储能元件的工作特性,实现了风功率波动的平抑以及HESS容量的合理配置,提高了系统的经济性。展开更多
基金funded by the National Natural Science Foundation of China(32300358,32370456)the Key Project of the Natural Sciences Foundation of Sichuan Province(22NSFSC0011).
文摘Dear Editor,Local adaptation in organisms involves changes in morphological,physiological,and biochemical traits in response to diverse environmental conditions(Mai&Liao 2019;Giacomini et al.2022;Jiang et al.2023).An organ,an important morphological trait in organisms,undergoes adaptive size adjustments in response to environmental factors(Liao et al.2022;Zamora-Camacho 2022).Typically,variations in organ size under diverse environments along geographic gradients are affected by factors such as food intake and oxygen fluctuations(Zhong et al.2017).The heart,a crucial organ in organisms,plays a vital role in assessing survival and fitness(Müller et al.2014).Significant variations in heart size exist both between and within species,with the Hesse’s rule stating that animals adapted to cold environments have a larger heart in relation to body weight than closely related species living in warm habitats(Hesse 1924).
文摘随着清洁能源规模的不断扩大,可平滑电能输出的混合储能系统(hybrid energy storage system,HESS)逐渐受到广泛关注。双有源桥可实现电气隔离和软开关,常应用于HESS中。为拓宽电压增益范围并降低储能装置侧电流纹波,文中提出一种基于电流源型双向谐振变换器的HESS拓扑。首先,给出变换器的拓扑及等效电路,分析其开关模态和工作原理,推导出等效电路模型、电压增益表达式及低压侧电流纹波特性。在此基础上,提出一种解耦控制策略,通过调节各储能装置侧全桥的占空比独立控制超级电容和蓄电池的传输功率,并根据功率分配指令动态调整各端口功率占比。仿真结果表明,所提系统能实现各开关管的零电压开通(zero voltage switching,ZVS),在负载切换和功率指令变化时均表现出快速的动态响应和良好的稳定性。
文摘随着新能源装机规模与并网比例持续攀升,其固有的随机性与波动性导致电网频率偏差加剧、调节压力增大,严重威胁系统稳定性与安全经济运行。针对这一问题,提出一种计及储能响应特性与风功率波动平抑需求的混合储能系统(hybrid energy storage system,HESS)容量优化配置策略。该方法采用先进绝热压缩空气储能(advanced adiabatic compressed air energy storage,AA-CAES)与电化学储能组成HESS。首先,将HESS的输入功率通过变分模态分解(variational mode decomposition,VMD)算法进行分解,为降低模态混叠对功率分解精确度的影响,使用差分进化(differential evolution,DE)算法对VMD算法的参数进行优化;其次,结合AA-CAES的响应速度划分初步分配边界,进一步以HESS综合成本最小为目标对HESS功率进行二次分配;最后,通过算例仿真对所提方法进行验证。结果表明:所提方法能够降低功率分解过程中产生的模态混叠,同时实现风功率在不同储能系统之间的合理分配,结合不同储能元件的工作特性,实现了风功率波动的平抑以及HESS容量的合理配置,提高了系统的经济性。
