计及多区域用户差异化PMV的柔性负荷多功率级调控策略

柔性负荷作为需求侧重要可调资源,能够参与电力系统灵活调节,促进新能源消纳。柔性负荷调控中存在的负荷功率属性、用户差异化舒适度以及状态序列等异构性问题,成为调控时需要考虑的难点。针对上述问题,该文首先利用预测平均指标(predicted mean vote,PMV)舒适度指标综合量化用户舒适度,建立计及PMV的柔性负荷多功率级调节模型;然后根据聚类算法和PMV-PPD模型,提出计及多区域用户差异化PMV的消纳量分配策略;其次基于功率状态队列对单功率级和多功率级柔性负荷群开展联合调控策略,根据消纳量变化动态调节负荷功率。算例仿真表明所提策略相比传统方法能进一步实现精准消纳,显著提升用户舒适度,同时使多功率级负荷平稳运行。

考虑新能源消纳的电采暖集群多功率级控制策略研究

目前,电采暖设备作为新能源消纳的有效途径存在源荷匹配性低、档位优化不足的问题。针对上述问题,提出一种基于电采暖设备集群控制架构的多功率级控制策略。首先,考虑电采暖用户舒适性、经济性及公平性目标,通过改进多目标粒子群算法(IMOPSO)确定最优基准档位。然后,建立综合加权指标与档位差值对应关系,确定电采暖多功率级最优档位差值。最后,以设备状态与负荷转移量为约束,实现电采暖设备多功率级控制。算例仿真结果表明,所提策略相比于传统控制方法可进一步实现新能源精准消纳,在提高负荷柔性的基础上提升用户采暖舒适度,为电采暖集群新能源消纳控制策略提供新的可行性方法。

A New Phase-Shifted Cascade High Voltage Inverter

This paper presents a unique novel design of the phase-shifted cascade high voltage inverter. Thehigh voltage inverter utilizes fewer power switches and supplies a balance load. The usage of phase shifttransformer and phase shifting SPWM ensures that input and output harmonic wave content is low and outputvoltage change (du/dt) has a low rate, meeting all the requirements of the power authorities. The most out-standing feature is the energy saving with very fast cost recovery.

Multilevel Power Modeling of Base Station and Its ICs

A new power estimation method is proposed for base station(BS) in this paper.Based on this method,a software platform for power estimation is developed.The proposed method models power consumption on different abstraction levels by splitting a typical base station into several basic components at different levels in the view of embedded system design.In particular,our focus is on baseband IC(Integrate Circuit) due to it's the dominant power consumer in small cells.Baseband power model is based on arithmetic computing costs of selected algorithms.All computing and storage costs are calibrated using algorithm complexity,hardware architecture,activity ratio,silicon technology,and overheads on all hierarchies.Micro architecture and IC technology are considered.The model enables power comparison of different types of base stations configured with different baseband algorithms,micro architectures,and ICs.The model also supports cellular operators in power estimation of different deployment strategies and transmission schemes.The model is verified by comparing power consumption with a real LTE base station.By exposing more configuration freedoms,the platform can be used for power estimation of current and future base stations.

Enhanced uplink non-orthogonal multiple access for 5G and beyond systems

Uplink non-orthogonM multiple access （NOMA） is a promising technique to meet the requirements of the fifth generation （5G） and beyond systems. Various NOMA schemes have been proposed in both academia and industry. However, most existing schemes assume equal average received power, which limits the performance. We propose three enhancements of uplink NOMA to achieve the requirements of massive connectivity and high reliability in 5G, where unequal average received power is exploited as part of the multiple access signature. First, the optimal sequences targeting to generalized Welch-bound equality （GWBE） are obtained for unequal average received power. Then user grouping with multi-level received powers is proposed for better successive interference cancellation （SIC） at the receiver. Finally, sequence grouping based on the cross-correlation properties of sequences is proposed to reduce inter-and intra-group interference. Simulation results show that by incorporating multi-level received powers and sequence grouping into existing NOMA schemes, for an NOMA system with 400% overloading and fixed signature allocation, 3 dB and 10 dB signal-to-noise ratio （SNR） gains at 0.1 block error rate （BLER） target can be achieved compared with existing NOMA schemes and orthogonal multiple access （OMA）, respectively. Besides, 0.01 BLER target can be achieved while an error floor exists in existing NOMA schemes. Under random sequence selection, collision probability is reduced by multi-level powers. In addition, GWBE sequences achieve lower BLER than existing sequences and the gain is large especially for low BLER requirements. This shows that the proposed scheme can support larger connectivity and higher reliability.