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- “在新一代锂电池储能系统领域，专家提出了串联型I-P下垂控制和改进均衡策略，有效实现了功率稳定分配和SOC均衡，大幅缩短均衡耗时。”摘要：In the new generation of lithium battery energy storage systems， battery modules are cascaded into modular power converters to form battery power modules， which then output in series to integrate into a DC grid. In charging mode， independent current control by each module controller can lead to unstable currents and diverging bus-side voltages. To solve this problem， the paper proposes a series-type I-P droop control strategy that incorporates the parallel droop concept to achieve stable power distribution. Additionally， it introduces a proportional balancing strategy based on I-P droop control， inspired by traditional proportional balancing methods. To enhance the balancing speed， the paper analyzes the operating points of the battery power modules and optimizes the design of the voltage division coefficient， proposing an improved balancing strategy that decouples power control from balancing control. Finally， the paper conducts a simulation analysis of a cascaded modular system consisting of six battery modules. The results demonstrate that the proposed series-type droop control can achieve stable power distribution， and with the inclusion of the balancing strategy， both stable power and state of charge （SOC） balancing can be achieved. Under the same balancing metrics， the improved balancing strategy significantly reduces the balancing time compared to the proportional balancing strategy.关键词：battery module;state of charge;droop control;power distribution;balancing strategy46|2|
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Identification of Abnormal data in online dissolved gas monitoring in oil based on PCA and Fast-MCD AI导读
“在变压器油中溶解气体监测领域，专家提出了基于PCA和Fast-MCD的异常数据识别方法，准确率高达99.1%。”摘要：To detect the operational status of transformers by online monitoring of dissolved gases in oil is critical for ensuring its stable operation. However， faults in monitoring devices can result in abnormal data， severely impacting the effect of online monitoring. To address this issue， a method for identifying abnormal data in dissolved gas monitoring based on principal component analysis （PCA） and fast minimum covariance determinant （Fast-MCD） is proposed. First， the PCA is used to reduce the dimensionality of time-series data for dissolved gas in oil， effectively eliminating redundant features. Next， robust statistical theory is applied to the reduced data using Fast-MCD to identify anomalies. Finally， the identified anomalies are analyzed to determine the source of the fault. Case studies demonstrate that the proposed method effectively identifies faults in online dissolved gas monitoring devices， outperforming conventional methods with an accuracy of 99.1%.关键词：anomaly detection;DGA;Fast-MCD;PCA49|52| - “在输电领域，扬州—镇江直流工程展示了交流改直流技术，显著提升输电容量，为同塔三回直流输电设计提供技术依据。”摘要：Converting double-circuit AC transmission lines on the same tower to triple-circuit DC transmission lines can significantly enhance transmission capacity without requiring large-scale additional investments or consuming transmission corridor resources. Focusing on the insulation coordination design of triple-circuit DC lines on the same tower， this paper examines the ±200 kV Yangzhou-Zhenjiang AC-to-DC transmission project， the first of its kind in China. Six DC pole line layout schemes are analyzed to compare the distribution characteristics and maximum overvoltage along the DC lines， with results further compared to single-circuit DC line configurations. Additionally， the factors influencing overvoltage levels in triple-circuit DC lines on the same tower are explored. The findings indicate that the overvoltage distribution characteristics along the line are similar across different layout schemes for triple-circuit lines， and the overvoltage levels for triple-circuit lines on the same tower are slightly lower than those of single-circuit lines. Key influencing factors include the DC system’s transmission power， the main capacitance of DC filters， and soil resistivity. These results have provided a technical foundation for the design and construction of the Yangzhou-Zhenjiang AC-to-DC transmission project.关键词：AC-to-DC transmission;HVDC transmission;triple-circuit transmission lines on the same tower;line overvoltage32|18|
- 摘要：To address the frequency stability challenges caused by reduced inertia and insufficient frequency modulation capacity in power systems with a high proportion of renewable energy， this paper proposes an optimal dispatch and control strategy for thermal power and energy storage， with a focus on dynamic frequency response. First， a dynamic frequency response model is developed for a power system integrated with photovoltaic renewable energy， along with a formula to accurately quantify system-wide frequency fluctuation characteristics. Next， a frequency modulation model is established for a power system that incorporates energy storage. The goal is to optimize operational efficiency while considering the system’s operational constraints and dynamic frequency response metrics. Benders decomposition is applied to decompose the problem into a master problem and subproblems， which are solved iteratively to achieve optimal frequency modulation power allocation between thermal power units and energy storage stations. Finally， simulations are conducted using a case study of a regional power grid in Northwest China. Results demonstrates that the proposed strategy reduces frequency modulation costs by 1.39% compared to traditional strategies， validating its effectiveness.关键词：new energy penetration;frequency response;frequency modulation;scheduling strategy0|2|
- 摘要：To address potential risks in analog signal acquisition by relay protection equipment， this paper proposes a homologous waveform comparison method based on angular step search for automatically identifying anomalies in analog signals. First， the third-order Lagrange interpolation algorithm is employed to unify the sampling rates of waveforms with different source rates. Next， a reference waveform and the analog signal channel to be aligned are selected. Preliminary alignment of waveforms is achieved using the absolute time at the zero point， followed by fine alignment using the absolute value of the sampling value difference as the criterion， implemented via an angular step search method. Subsequently， anomalies in the analog signal channel are identified by comparing waveform phasor differences combined with sampling value differences. Furthermore， a homologous waveform comparison framework is developed， and the method is applied in practical engineering scenarios. Finally， case study results demonstrate that the proposed method achieves waveform alignment and identifies anomalous analog channels even under frequency offset conditions， proving its value for engineering applications.关键词：homologous waveform comparison;Lagrange interpolation;waveform alignment;angular step;phasor difference0|2|
- 摘要：Existing research on market strategies for distributed energy storage aggregators has not yet considered the integration of bidding decisions and incentive pricing， nor does it analyze the regulation capabilities of user-side energy storage aggregation under different operation modes. To address these limitations， firstly， based on a quantitative analysis of distributed energy storage operation modes， operational costs， and economic benefits， the incentive pricing-user participation curves for peak-valley arbitrage and backup storage for base stations are established， and a model for evaluating the dispatchable capacity of the user-side energy storage considering the operation modes is developed. Secondly， by integrating the dispatchable capacity estimation method for user-side energy storage， a joint bidding and pricing optimization model is established for distributed energy storage aggregators in frequency regulation and electric energy markets， with the goal of maximizing trading revenue. Finally， through a case study analysis， it is demonstrated that the proposed bidding strategy and coordinated scheduling of distributed energy storage aggregators in the frequency regulation market can increase aggregator revenue while ensuring the feasibility of the decisions.关键词：user-side energy storage;aggregator;user participation level;frequency regulation market;bidding0|2|
- 摘要：With the construction of new-type power systems， large-scale integration of renewable energy sources and frequent extreme weather events pose significant challenges to power balance in power grids. Dispatchers need to accurately assess the risk of large-scale power grid imbalance in real time and utilize inter-provincial AC/DC systems for wide-area mutual power support to address these challenges. This paper proposes a generation method of inter-provincial power support strategies based on ultra-short-term balance margin. Firstly， it assesses power balance capability and risks through ultra-short-term power balance margin and power supply capacity indicators. Secondly， based on the balance margin， a generation method of inter-provincial power support strategies considering security constraints of AC/DC systems is proposed. Finally， case studies using actual grid operation data verify the method’s effectiveness and practicality. Practical applications show that dispatchers can use this method to accurately assess balance risks of large grids and rapidly generate inter-provincial power support strategies.关键词：reliable power supply;power-energy balance;balance capacity assessment;ultra-short-term balance margin;ultra-short term power supply capacity0|2|
Most Read 
- 0 1 Identification of Abnormal data in online dissolved gas monitoring in oil based on PCA and Fast-MCD 49
- 0 2 Grid connection power control and the SOC balancing strategy for lithium battery energy storage systems 46
- 0 3 Study on overvoltage in ±200 kV triple-circuit DC transmission lines on the same tower for an AC-to-DC transmission project 32
- 0 4 Optimal control of frequency modulation for thermal power and energy storage considering dynamic frequency response 0
- 0 5 A generation method of inter-provincial power support strategies based on ultra-short-term balance margin 0
- 0 6 A homologous waveform comparison method based on angular step search and its application 0
- 0 7 Research on a bidding strategy and coordinated scheduling of distributed energy storage aggregators in frequency regulation market 0
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