摘要
为了解决屋顶光伏逆变器谐波谐振导致的渗透率提高受限问题,提出了一种基于双重稳定约束的分布式阻尼重构方案。首先,基于多逆变器等效阻抗模型,分析了强网弱化特性与渗透率之间的耦合关系及谐振易发机理;然后,以强网弱化下谐波谐振为约束,探究了差异化调控出力及台数下的新能源渗透率特性;其次,考虑调控经济性,通过在底层逆变器调制波中叠加额外阻尼等效控制量,提出了分布式阻尼重构方案,并结合系统谐波谐振抑制及自身稳定的双重稳定约束要求,构建了基于系统级阻抗匹配及底层零极点的分布式阻尼极限重构能力评估方案,以实现渗透率的最大提高;最后,通过仿真和实验验证了所提方案的有效性。研究结果表明,所提方案可提高逆变器的谐波谐振抑制能力及并网系统的渗透率水平,为屋顶光伏大规模接入提供技术保障。
To solve the limitation of the penetration improvement caused by harmonic resonance of rooftop photovoltaic inverters,a distributed damping reconstruction control scheme based on dual stability limitations is proposed.Firstly,the coupled relationship between the grid strength and penetration,and the harmonic resonance mechanism were investigated based on the equivalent impedance model of multi-parallel inverters.Secondly,the harmonic resonance under grid weak-ening was taken as a constraint,and the penetration characteristics of new energy under different dispatched power and number of units were analyzed.Thirdly,the economy of the power dispatch was taken into account,and the equivalent control component of the extra damping was added into the modulation wave of the bottom inverter to form the distribut-ed damping reconstruction control scheme.Moreover,the dual stability limitation requirements of harmonic resonance suppression and the self-stability were taken into account,and an evaluation scheme of the maximum ability of the dis-tributed damping reconstruction was constructed based on the impedance matching and pole-zero diagram,so as to realize the maximum improvement of the penetration level.Finally,the effectiveness of the proposed control scheme was verified by simulations and experiments.The research results show that the proposed control scheme can improve the harmonic resonance suppression ability of the inverters and the penetration level of the grid-connected system,providing a technical support for the large-scale integration of rooftop photovoltaics.
作者
齐磊
赵巍
孙孝峰
李昕
翟燕飞
QI Lei;ZHAO Wei;SUN Xiaofeng;LI Xin;ZHAI Yanfei(Key Lab of Power Electronics for Energy Conservation&Motor Drive of Hebei Province,Yanshan University,Qinhuangdao 066004,China;State Grid Qinhuangdao Power Supply Company,Qinhuangdao 066004,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第1期394-405,I0023-I0028,共18页
High Voltage Engineering
基金
河北省重点研发计划(19214405D)
河北省自然科学基金(E2021203162)。
关键词
屋顶光伏
渗透率
强网弱化
谐波谐振
双重稳定约束
阻尼重构极限
rooftop photovoltaic
penetration
grid weakening
harmonic resonance
dual stability limitations
maximum damping reconstruction
