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全球能源互联网, 2023 针对特高压直流闭锁等原因造成的受端电网频率严重跌落问题，提出一种储能紧急频率控制策略。首先，建立储能参与紧急频率控制的数学模型。其次，对于大功率缺额后发电机组惯性响应不足问题，提出了改进的频率变化率（rate of change of frequency，RoCoF）下垂控制策略以提高储能的惯量支撑，根据储能比例分配系数实时调节储能虚拟惯性及下垂控制出力；惯性响应阶段以RoCoF下垂控制为主、虚拟惯性控制为辅，抑制系统频率变化率；结合频率调节需求和储能系统出力特点提出不同区域的调频策略 ...
苏大威, 郝雨辰, 高水朋, 葛乐
doaj +3 more sources
全球能源互联网, 2021 大规模的可再生能源并网使得电网内传统机组占比减小,惯性水平降低,电网的频率稳定性面临严重挑战。储能作为一种优质的调频资源,其调频时的高额注入功率会改变系统原有潮流,可能导致部分线路功率越限,因此提出了考虑系统潮流约束的“储能-输电网”联合规划模型。首先分析系统频率最大偏差与储能装机功率以及机组停运功率的关系,对系统内不同故障下的储能需求进行估计；然后以储能与输电线路扩建总成本最小为目标,建立考虑潮流约束的储能与输电线路扩建联合规划模型；最后基于修正的IEEE-39节点系统进行算例验证 ...
郭嘉庆 +4 more
doaj +1 more source
基于模型预测控制的光储发电系统VSG频率控制方法 [PDF]
, 2022 随着光伏发电装机规模大幅提升，电力系统转动惯量不断降低，虚拟同步发电机（virtual synchronous generator，VSG）技术被广泛采用以应对日益严峻的电网稳定性问题。为进一步提高VSG技术对系统稳定性的改善作用，提出基于模型预测控制的VSG频率控制方法。该方法首先在同步发电机转子运动方程和逆变器下垂控制方程基础上建立VSG可优化的离散模型，再通过模型预测控制（model predictive control，MPC）预测VSG转子角频率的运动轨迹 ...
张志丹 +3 more
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Secondary frequency control of islanded microgrid considering wind and solar stochastics
, 2023 As the high penetration of wind and photovoltaic distributed generation (DG) in the microgrid, the stochastic and low inertia emerge, bringing more challenges especially when the microgrid operates in isolated islands.
Chen, Jikai +4 more
core +1 more source
374~747 MHz digital tunable microstrip filter [PDF]
, 2016 A novel digital microstrip tunable bandpass filter based on digitally tunable capacitor loading microstrip open ring resonators was proposed.The novel non-uniform open ring resonances with mixed coupling structure was used to make the coupling ...
Deng-yao TIAN +2 more
core +1 more source
Research for Inertia Response and Primary Frequency Regulation Ability of Wind Turbine [PDF]
, 2023 [Introduction] Large-scale connection of wind power to the power grid poses great challenges to the stability (especially frequency stability) of grid operation.In order to solve the problem of inadequate frequency regulation capability caused by large ...
Jiangtao GUO +4 more
core +1 more source
Comparison and Development of Rotary and Scroll Compressor [PDF]
, 2019 The performance of compressors is an important key in air-source heat pumps under different climatic conditions. The development of compressors is reviewed in this study.
Dai Baomin +4 more
core +1 more source
Heating Control Strategy of VRF with Digital Scroll Compressor [PDF]
, 2011 A 10HP variable refrigerant flowrate air conditioning system(VRF AC) with digital scroll compressor was developed.Based on the unstable running characteristics of the VRF AC,the new control strategy including the control model of compressor output ratio ...
core +1 more source
Metaverse Application in Power Systems [PDF]
, 2022 Metaverse is a new internet application and social form of virtual reality integration which is produced by integrating a variety of new technologies.
LI Guangdi, XI Chao, YANG Bo, ZHOU Bowen
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Data-driven Health Status Prediction of the Hydraulic Turbine Governing System [PDF]
, 2017 水轮机调速系统是水轮发电机组的关键控制系统。运用故障树与专家系统相结合的方法对调速系统可能发生的故障进行诊断,并基于历史数据,挖掘与故障相关的可能因素,对专家系统无法解决的故障进行分析,构建了基于数据驱动的水轮机调速系统健康状态预测系统。The hydraulic turbine governing system is the key control system of the hydro-turbine generator unit.
周绮凤 +6 more
core +1 more source