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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Pai Li Na Meng Siyang Liu Peidong Han Jinping Zhang State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

In this paper, a method on evaluation of annual accommodation ability of high renewable energy penetrated power system with cascaded hydro power plants is proposed. Firstly, an aggregated cascaded hydro power operation model is established and a long-term unit commitment model with cascaded hydro power, thermal, wind and photovoltaic (PV) plants is formulated. The objective of the formulated model is maximizing the power generation of renewable energy, and constraints of load balance, system reserve, and operations of each power plants are considered. Secondly, the hourly power series of renewable energy is incorporated as inputs which contain theoretic power outputs of wind, PV and natural water inflows of each cascaded hydro power plant. Thirdly, a monthly sequential decomposition algorithm is adopted to solve the long-term unit commitment model. Finally, the proposed method is tested on a high renewable energy penetrated power system with large-scale wind, PV and cascaded hydro power. Testing results indicate the effectiveness and applicability of the proposed method.

关键词： renewable energy sources Wind energy Processor scheduling Computational modeling Stochastic processes System integration Complexity theory

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A Multi-type energy storage control Strategy for Promoting renewable energy Consumption and Active-Support Ability

A Multi-type Energy Storage Control Strategy for Promoting R...

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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Huimeng Ma Rongyu Wu Xiangjun Li State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China

The development of a new type of power system based on renewable energy will seriously degrade the system frequency characteristics and the level of safety and stability, which needs to be solved urgently. In order to promoting new energy consumption and active-support ability, this paper proposes a multi-type energy storage system(MTESS) control strategy based on frequency domain decomposition algorithm on the side of renewable energy power station (REPS), which can realize the multi-type energy storage system to efficiently meet the requirements of reducing the curtailment rate and compensating for the power prediction error, energy storage demand in the complex process of primary frequency modulation demand in random high frequency. Finally, the feasibility and superiority of this control method are proved by the analysis of practical examples.

关键词： renewable energy sources energy consumption Frequency-domain analysis System integration Power system stability Prediction algorithms control systems

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Comprehensive Evaluation Technology of Photovoltaic Power Station Power Generation Performance Based on Minimum Deviation Combined Weighting Method

Comprehensive Evaluation Technology of Photovoltaic Power St...

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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Jian Zhang Lianghui Xu Lie Xia Qingbin Yang Zhilei Chen Wei Dong State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

In order to further optimize resource structure, reduce the energy gap, alleviate environmental pollution and promote the sustainable development of the whole social energy system, the scientific evaluation and decision-making mechanism of photovoltaic power generation projects need to be established, and the comprehensive evaluation system of photovoltaic power station power generation performance need to be improved. This paper focuses on the comprehensive evaluation system and evaluation method of photovoltaic power generation units. Based on the basic principle of multi-objective, multi-criteria, multi-factors and multi-level decision-making, a comprehensive evaluation system suitable for photovoltaic power generation units is proposed, which considers the advantages and disadvantages of objective weight method and subjective weight method. The minimum deviation combined weighting method is used to calculate the combined weight, and then the comprehensive performance evaluation model of photovoltaic power generation unit is established. The comprehensive evaluation results of the new photovoltaic medium voltage power generation unit and the conventional photovoltaic power generation unit are compared and analyzed, so as to prove the superiority of the design index of the former.

关键词： Photovoltaic systems Performance evaluation Pollution Decision making Medium voltage System integration Planning

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Coordinated Optimization of Power Rating and Capacity of Battery storage energy System with Large-Scale renewable energy

Coordinated Optimization of Power Rating and Capacity of Bat...

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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Peidong Han Pai Li Xiaodi Xie Jinping Zhang State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

With the rapid development of renewable energy power in China, the accommodation of renewable energy has faced a new challenge. The Large-scale battery energy storage system (BESS) is a promotive way to improve the accommodation of renewable energy. In this paper, a method for power rating and capacity optimization of BESS is proposed based on sequential production simulation technology. An optimization model is established to maximize the utilization of renewable energy, considering constraints of system power balance, the operation mode of BESS, and conventional units. The annual hourly curtailment time sequence of renewable energy is incorporated as inputs with the target of utilization rate as constraints for optimizing the power rating and capacity of BESS. In the case of studies, an annual hourly curtailment time sequence in a province of China is tested, and the optimal power rating and capacity of BESS of the province are obtained. The testing results verify the effectiveness of the proposed method.

关键词： renewable energy sources Costs Flow production systems System integration Production Batteries Optimization

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Research on the Stage Division Standard for the Transient Response in Active Distribution Networks

Research on the Stage Division Standard for the Transient Re...

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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Shanhua Hu Yalou Li Xing Zhang Qing Mu Linlin Ma Weiwei Miao State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China Dispatch Control Center Control Office State Grid Shandong Electric Power Company Beijing China

With the increasing integration of a significant number of Inverter-Based Distributed Generators (IBDGs), the transient characteristics on the low-voltage distribution network side have undergone substantial changes, rendering traditional stage division standards less applicable. This paper proposes a novel stage division standard for the transient response in Active Distribution Networks (ADNs), serving as a crucial tool for a more profound analysis of the interactions between ADNs and the transmission network. The paper begins by developing an electromagnetic model using a real ADN then performs large disturbance simulations for ADNs at different penetration levels, and introduces a new segmentation criterion based on the external characteristics of ADNs under large disturbances. By formulating mathematical models for the components within the ADN during transient stages, this paper delves into a mechanistic analysis of the external characteristics of ADNs at each phase and identifies key factors influencing the external characteristics in various stages.

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Hybrid MMC AC Side Smooth Start-Up Strategy

Hybrid MMC AC Side Smooth Start-Up Strategy

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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Zhou Xin Mu Qing Li Yalou Chen Jing Ma Linlin Miao Weiwei State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China Dispatch Control Center Control Office State Grid Shandong Electric Power Company Shandong China

Modular multilevel converters are currently the mainstream topology in flexible HVDC projects. Compared with half-bridge MMC, hybrid MMC has DC fault ride through capability, and has economic cost advantages over full-bridge MMC and has broad application scenarios. At present, the main problem of hybrid MMC is that it is difficult to start smoothly, and it is difficult for the full-bridge sub-module and half-bridge sub-module to achieve capacitor voltage balance during the AC side start-up process, and the converter is easy to generate inrush current when unlocked, threatening the system safety. In order to solve the above problems, a three-stage AC start-up scheme is proposed, which can ensure that the half-bridge submodule and the full-bridge submodule can reach the self-absorbed energy voltage during the charging process, and the proposed dynamic grouping and sorting algorithm can improve the calculation efficiency of the traditional sorting algorithm and accelerate the capacitor-voltage balance process. The proposed method is verified by ADPSS, an electromagnetic transient simulation platform independently developed by China Electric Power Research Institute.

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Impact of Power Quality in Specific energy Consumption of PEM Water Electrolyzer

Impact of Power Quality in Specific Energy Consumption of PE...

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Yannan Dong Lei Gao Shaohua Ma Xin Yao Xiangjun Li School of Electrical Engineering Shenyang University of Technology Shenyang China State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China

The power quality of the rectifier power supply and the load characteristics influence the specific energy consumption (SEC) of PEM water electrolyzer. This paper establishes a PEM water electrolyzer model, and examines the harmonic distribution of the stack current for 6-pulse and double star rectifiers. It then calculates the ripple factors (RF) and power factors (PF) of the PEM water electrolyzer, and analyzes the SEC of the water PEM electrolyzer under the two rectifier types. The results indicate that the double star rectifier shows greater improvements in PF, RF, and harmonic distribution. Therefore, to reduce the cost of electricity for hydrogen production, the double star rectifier may be considered in PEM systems.

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Design of Bidding Mechanism for Prosumers to Participate in Ancillary Service Market Based on Mechanism Design Theory 4

Design of Bidding Mechanism for Prosumers to Participate in ...

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4th IEEE International Conference on Electronics Technology, ICET 2021

作者： Yang, Xue Pan, Siyu Hu, Junjie Liu, Baozhu Luo, Kui North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China

ISBN: (纸本)9781728176734

With the rapid development of distributed photovoltaic, electric vehicles, energy storage and other technologies, the group of prosumers with dual functions of power production and consumption is growing. Prosumers have high responsiveness, flexible operation characteristics, and huge development potential. However, individual resources are limited and very scattered, and cannot directly participate in the power auxiliary service market. Therefore, virtual power plants are introduced to effectively aggregate and manage the resources of prosumers. Based on the theory of economic mechanism design, a bidding mechanism for prosumers to participate in the auxiliary service market has been established. This mechanism has the characteristics of incentive compatibility, which can effectively encourage Virtual power plants to report true costs, save electricity costs, and achieve effective resource allocation. The rationality and effectiveness of the proposed mechanism are verified through the analysis of a calculation example. © 2021 IEEE.

关键词： Virtual Power Plants

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Forecasted Scenarios of Regional Wind Farms Based on Regular Vine Copulas

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Journal of Modern Power systems and Clean energy 2020年第1期8卷 77-85页

作者： Zhao Wang Weisheng Wang Chun Liu Bo Wang State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijingChina Department of Electrical Engineering Tsinghua UniversityBeijingChina

Owing to the uncertainty and volatility of wind energy,forecasted wind power scenarios with proper spatio-temporal correlations are needed in various decision-making problems involving power *** this study,forecasted scenarios are generated from an estimated multi-variate distribution of multiple regional wind *** to the theory of copulas,marginal distributions and the dependence structure of multi-variate distribution are modeled through the proposed distance-weighted kernel density estimation method and the regular vine(R-vine)copula,*** to the flexibility of decomposing correlations of high dimensions into different types of pair-copulas,the R-vine copula provides more accurate results in describing the complicated dependence of wind *** the case of 26 wind farms located in East China,highquality forecasted scenarios as well as the corresponding probabilistic forecasting and point forecasting results are obtained using the proposed method,and the results are evaluated using a comprehensive verification framework.

关键词： Forecasted scenarios wind power distanceweighted kernel density estimation(KDE) regular vine(R-vine)copula spatio-temporal correlation

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A Deep Convolutional Embedded Clustering Method for Scenario Reduction of Production Simulation

A Deep Convolutional Embedded Clustering Method for Scenario...

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IEEE International Conference on Power and Power and renewable energy (ICPRE)

作者： Yishu Peng Lin Ye Pai Li Ting Gong College of Information and Electrical China Agricultural University Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

renewable energy has significant seasonal characteristics and random and fluctuating features, which bring great challenges to the planning and operation of power systems. Typical scenarios of production simulation can provide a decision-making basis for the formulation of dispatch and operation modes, which is significant for the planning and operation of the power system. To obtain the representative production simulation scenarios, a method for scenario reduction based on deep convolutional embedded clustering (DCEC) is proposed in this paper. The convolutional self-encoder is used to reduce dimension and extract features from the high-dimensional production simulation data, and input to the clustering layer to obtain the initial clustering centers. A joint loss function combining clustering loss and reconstruction loss is established, and the final clustering results are obtained by iterative update. The clustering evaluation index Calinski-Harabaz index score and Silhouette coefficient are used to analyze the clustering results, and the results verified the validity of the typical scenarios of production simulation obtained by DCEC aggregation.

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