2022年5月14日,国务院办公厅印发《关于促进新时代新能源高质量发展的实施方案》(国办函[2022]39号),提出要稳妥推进新能源参与电力市场交易.可再生能源如何有效参与电力市场实现更合理的配置是当前一个重要问题.

园区是我国城市碳排放的主要场所,厘清园区级碳排放源/碳汇构成是开展园区低碳路径研究的关键.目前,国内外还未发布园区级碳排放计算相关规范或指南,已开展的研究大多针对存量的某一特定类型园区碳排放进行计算分析,未充分考虑新建园区的数据可得性以及计算体系对不同类型园区的适应性问题.因此,开展了计及多类型园区特征的碳排放计算方法研究,从能源活动(覆盖农业、工业、建筑、交通、旅游设施、其他公共基础设施等)、农业生产、工业生产、废弃物处理、绿植碳汇5个维度构建园区级碳排放计算体系,并分别给出数据完备和数据缺失情况下的计算公式.算例表明,所提方法对特色农业型园区、工业制造型园区、商务办公型园区、旅游休闲型园区等多类型园区的碳排放总量计算以及结构分析均适用.

In order to expand the proportion of renewable energy in new power system, a benchmarking system is proposed according to foreign practical experience and the construction of domestic power market. In the benchmarking system, three aspects are considered, including encouraging renewable energy generation construction, participating in market operations, and related markets. Besides, six benchmarking objects are selected for analysis, including Germany, the United Kingdom, the United States (including California and Texas), Guangdong and Jiangsu. The benchmarking results show that at present, renewable energy generation in Europe and the United States has achieved a high degree of market-oriented allocation, while renewable energy generation in China is still dominated by full guarantee consumption, which is equivalent to the international fixed electricity price subsidy stage. Therefore, competition needs to be introduced through bidding reasonably in the future, to realize the electric energy value and green value discovery of renewable energy generation. Moreover, participating in the medium and long-term market, establishing and improving the auxiliary service market, capacity market or capacity compensation mechanism are needed in order to avoid market price fluctuation risk, increase the safety and reliability of new power system and expand revenue compensation channels for traditional thermal power.

Achieving the double carbon target is a well-thought-out strategic decision made by the CPC Central Committee and a major national strategy with overall, comprehensive, fundamental and long-term characteristics. With the dual carbon target, the power system needs profound changes. As one of the earliest countries in the world to initiate the transformation of energy and electricity, Germany has a wealth of high proportion of renewable energy power system operation and management capacity. This paper analyzes the general situation, management experience, technical experience and supporting market experience of German power system, which provides reference for China to construct a new power system with new energy as the main position under the dual carbon background.

On March 15，2021，China proposed for the ifrst time to construction a new electric power system based on new energy power. Jiangsu Province，as an advanced region with socioeconomic development in China，is relatively lack of energy resources despite its large energy demand. At the same time，the scale of Jiangsu electric power system is large and the morphological characteristics is complex. Under the target of“emission peak and carbon neutrality”，the scale of power from outside，the proportion of wind power， PV power generation and other new energy power gradually increased，leading to more complex morphological of Jiangsu electric power system. In this paper，the general situation of Jiangsu electric power system is introduced，and its characteristics are analyzed. Then it introduces the transformation experience of foreign electric power systems，such as Denmark，Germany and the United Kingdom. By analyzing the international experience and combining the actual situation of Jiangsu Province，it puts forward the reference direction for Jiangsu to construction a new electric power system.

Data center is the key infrastructure of China digital development. It is urgent to carry out research on reducing the comprehensive energy cost of data center through configuring multiple energy storage facilities. An economic analysis is made on the energy storage technical paths for data center from the overall perspective of optimal configuration of the data center integrated energy system and operation strategy of energy system. A case study is made by taking a data center in Beijing as an example, and results show that optimal configuration of emergency and peak-shaving energy storage as well as system operation strategy can substantially reduce the system operating cost and annual equipment investment cost.

As the goal of emission peak and carbon neutrality is proposed, modern power system will develop into a new power system. Integrated energy service, as one of the products of new power system, has great market potentials. Therefore, how to quantitatively assess the real investment potentials and market benefits of various integrated energy service projects in different districts has become a pivotal issue. In this paper, a kind of market potential analysis method of integrated energy service in new power system is put forward. First, the largest market potential was evaluated. Then, based on the diffusion theory, the potential analysis model and parameter modification were proposed to calculate the actual market scale. Moreover, economic, social and environmental benefits of those integrated energy service projects were analyzed. Last but not least, Jiangyin District was taken as an example for case study, together with related suggestions for integrated energy services.

Urbanization is closely related to energy development. Based on a case study of Suzhou city Wuzhong district, the urbanization characteristics of Wuzhong district are analyzed from the aspects of history, geography, population and economical industry. Meanwhile, the district’s basic conditions, such as location situation, energy resources, energy consumption, energy technology utilization and ecological environment, are also analyzed. At last, the energy transition path for Wuzhong district is proposed from 7 dimensions, including social economic development, infrastructure, industrial structure, urban function & morphology, ecological environment, governance level and cultural concept.

工业园区具有经济基础好、能源消耗大、产业集聚等特点,是构建灵活多样、低碳高效的综合能源服务体系的“理想试验田”.从物理层、信息层、服务层3个层面阐述了当前工业园区综合能源服务系统架构.从促进清洁能源消纳、能源需求优化、能源效率提升以及市场效益挖掘4个方面探讨了适合园区开展的综合能源服务商业模式,并从推动市场公平竞争、开放共享发展的角度提出了相关政策建议,为探索建立园区综合能源服务商业模式提供参考.

The energy local area network (LAN) acts as an important component of Energy Internet. With the integration of multi-types of energy storage (ES), energy LAN becomes more flexible and efficient. This paper presents a region-specific methodology for analyzing the market potential of energy LAN integrated with heterogeneous ES. The main steps of the proposed method can be summarized as typical user profiles generation, regional energy consumption estimation, profit calculation and financial analysis. As a result, financial indicators like internal rate of return (IRR) provided by the method are used for market potential analysis. Finally, the case study evaluates and ranks the market potentials of 10 selected regions, indicating that regions with high proportion of manufacturing users and hotel buildings are more profitable to operate as energy LANs.

The ecological indicator system is the detailed description of the connotation of green ecological district (town). Under the background of comprehensive construction of characteristic town which is the special form of ecological district (town), the study on its ecological indicator system has significant practical significance. This paper analyzes the construction experience and indicator system of different scale ecological district (town) such as Wuxi Taihu New City, Shenzhen Guangming New District and Qingdao Sino-German Ecopark. The construction principles and ideas of indicator systems are summarized through the horizontal comparison from the aspects of development vision, construction goals and indicators distribution. Taking Tongli New Energy Town which is the permanent site of the International Forum on Energy Transitions as an example, the suggested framework and sub-indicators of ecological indicator system are proposed based on the development orientation of energy transition demonstration and local resource conditions. The safeguard measures and policy needs are refined from the perspective of institutional support, process management, capacity building and operation and maintenance management to ensure the effective implementation of indicator system.

With the advancement of China's comprehensive energy services, the multi-energy microgrid has become more and more popular. As a typical substitution of electric energy, the heat pump has remarkable social and economic benefits in the multi-energy microgrid. In order to better develop comprehensive energy services, it is of vital importance to evaluate the efficiency and benefit of the microgrid. In this paper, the differences of several types of heat pumps are considered, and a day-ahead economic dispatch model for electric-thermal-gas microgrid is established. From the technical and economic perspectives, some indicators to measure the efficiency and benefit of multi-energy microgrid are then proposed. Case studies of a typical park-level multi-energy microgrid shows that these indicators can reflect the effect of heat pump on the efficiency and benefit of multi-energy microgrid. In addition, case studies also draw a conclusion that the heat pump can improve the rate of energy utilization and the economics of microgrid operation, and different types of heat pumps have different effects in improving the efficiency and benefit of multi-energy microgrid.

介绍在并网故障下对双馈感应风力发电系统改进的控制策略研究.并网故障分为对称故障和不对称故障,在不对称故障情况下,当电网电压频率为60 Hz并且电机转速接近同步速时,在双馈感应风力发电机的转子中将会出现接近于120 Hz的转子电流主要谐波;在对称故障下,定子电压有一个瞬间跌落,从而会在转子中导致过电流、过电压、过转速的出现.该文中转子侧变频器(RSC)主要用于抑制在并网故障下转子中出现的谐波分量或过电流等现象;网侧变频器(GSC)则用于抑制变频器之间直流电容电压中出现的谐波,以维持直流电容电压恒定.所提出改进控制策略可更好地抑制并网故障,改善整个双馈感应风力发电系统的控制性能,并使用Matlab/Simulink仿真验证了控制效果.

Aiming at the problems of switching power supply shortage of microcomputer relays,the structure and the invalid factor of switching power were investigated. After the analysis,the theoretic lifetime converting and output ripple wave and the output voltage discriminance were established. The methods were presented to test the switching power performance. The hardware circuit was designed on the methods,the whole system was tested. The experimental results indicate that the methods are reliable and practicable.

This paper presents an improved control strategy for both the rotor side converter (RSC) and grid side converter (GSC) of a doubly fed induction generator (DFIG)-based wind turbine (WT) system to enhance the low voltage ride through (LVRT) capability. Within the proposed control strategy, the RSC control introduces transient feed-forward compensation terms to mitigate the high frequency harmonic components and reduce the surge in the rotor currents. The proposed GSC control scheme also introduces a compensation term reflecting the instantaneous variation of the output power of the rotor side converter with consideration of the instantaneous power of grid filter impendence to keep the dc-link voltage nearly constant during the grid faults. To provide precise control, non-ideal proportional resonant (PR) controllers for both the RSC and GSC current regulation are employed to further improve dynamic performance. Simulations performed in Matlab/ Simulink verify the effectiveness of the proposed control strategy.

With increasing wind power in power systems, impact of subsynchronous resonance (SSR) on wind generator is of interest. This study presents the models of a double-fed induction generator (DFIG)-based wind turbine in a series-compensated network for SSR study. For DFIG (induction machine), the induction generator effect (IGE) is the most important factor of SSR. The control scheme for IGE is proposed in this study and the impact of the control parameters is also studied in detail. Eigenvalue analysis is conducted to study the impact of wind speeds, series compensation levels and control scheme on IGE phenomena. Time-domain simulations are performed in Matlab/Simulink to confirm the analysis.

The increasing presence of wind power in power systems will likely drive the integration of large wind farms with electrical networks that are series-compensated to sustain large power flows. This may potentially lead to subsynchronous resonance (SSR) issues. In this paper, a supplementary controller on the grid-side converter (GSC) control loop is designed to mitigate SSR for wind power systems based on doubly fed induction generators (DFIGs) with back-to-back converters. Different supplementary controller feedback signals and modulated-voltage injecting points are proposed and compared based on modal analysis and verified through root locus analysis to identify the optimal feedback signal and the most effective control location for SSR damping. The validity and effectiveness of the proposed supplemental control are demonstrated on the IEEE first benchmark model for computer simulations of SSR by means of time domain simulation analysis using Matlab/Simulink.

Interests of subsynchronous resonance (SSR) in series compensated electric networks with wind power penetration have arisen recently. To better understand the nature of such systems, modal analysis of a doubly-fed induction generator (DFIG)-based wind energy system interconnected with a series compensated electric network is conducted in this paper. The system model is built in Matlab/Simulink. The major contributions of the paper include: 1) identification of the four system modes (SSR, supersynchronous, electromechanical, and shaft modes) of a DFIG-based wind farm interfaced with a series compensated network, 2) investigation of the impacts of various parameters and operating conditions on those modes, and 3) prediction of the dynamic performance of the system using modal analysis and confirmation of such prediction via time-domain simulation results.

With increasing wind power in power systems, impact of wind generators on subsynchronous resonance (SSR) is of interest. Previous research has shown the impact of wind generation on SSR. In this paper, a control strategy is developed utilizing the power converters' control capability in a doubly fed induction generator (DFIG)-based wind turbine system. The control is realized through modulating the voltage command in the control loops of the grid side converter (GSC). Matlab/Simulink is used to perform eigenvalue analysis and time-domain simulations and test the control strategy. The major contribution of the paper includes: 1) identification of DFIG's GSC for SSR damping; 2) design of a supplementary control in a GSC's control loops.

This paper conducts an analysis of subsynchronous resonance (SSR) phenomena in doubly-fed induction generator (DFIG)-based wind farms interconnected with series compensated networks. A dynamic model is developed to analyze the induction generator effect (IGE) and torsional interaction (TI) in such systems. A test system derived from the IEEE first benchmark model is considered for the analysis. The effect of two factors namely: 1) series compensation level and 2) wind speed on the IGE and TI are studied. In addition, impact of the inner current converter controller parameters and turbine parameters on SSR is also addressed. Small signal (eigenvalue) analysis is conducted to assess the damping of network and torsional modes followed by dynamic (time domain) simulations. The major contribution of this paper is the analytical investigation on SSR phenomena presented in DFIG-based wind farms interconnected with series compensated networks. The paper clearly demonstrates that IGE instead of TI is the major reason for SSR in such systems.