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10th China International Conference on Electricity Distribution, CICED 2022

作者： Guo, Shaofei Li, Tiecheng Wang, Xianzhi Zhang, Binghai Liu, Qingquan Liu, Shiyan Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

The structure of petal-shaped distribution network is more complicated. Between substation and switch station, switch station and switch station are connected by the tie line. The tie line is one of the components that most easily to have a failure. Therefore, the fault characteristics and protection configuration of the tie line need to be studied deeply. A new backup protection scheme is proposed to determine the fault position of the tie line by using the variation of active power of the tie line. PSCAD/EMTDC simulation software is used to establish a power grid model to verify the effect of protection. The results show that the proposed scheme can significantly shorten the time of fault removal compared with the traditional scheme, with higher reliability. © 2022 IEEE.

关键词： Electric power transmission networks

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Reactive Power Chance-constrained Optimization Method for an Active Distribution Network Considering DG Actively Regulation 10

Reactive Power Chance-constrained Optimization Method for an...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Li, Xiaqjun Li, Anyi Liang, Jifeng Yu, Tengkai Li, Tiecheng Cui, Tongfei Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

The high proportion of Distributed generation (DG) connecting to the grid changes the operation characteristics of distribution network, and the traditional deterministic reactive power optimization method is difficult to adapt to the challenge brought by the uncertainty of DG operation. Therefore, a reactive power opportunity constraint optimization method for active distribution network taking into account the active regulation cost of DG is proposed. Constructed by power flow equations are linearized, and DG reactive active regulation of reactive power optimization model of mixed integer second order cone. Based on the reactive power of the traditional on-load voltage regulating and parallel compensation, the reactive power regulation means is expanded, considering DG adjustment cost and the number of traditional reactive power regulation constraints. Scene cut method is used to simplify the solving process, The optimal network loss and the minimum adjustment cost are realized. An example shows that compared with the traditional deterministic reactive power optimization method, the proposed method has higher robustness in dealing with the reactive power regulation problem caused by the uncertainty of DG operation. © 2022 IEEE.

关键词： Reactive power

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Topological Identification of Distribution Network Based on μPMU Voltage Phase Data 10

Topological Identification of Distribution Network Based on ...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Guo, Shaofei Wang, Xianzhi Tianying, Chen Ze, Li Shiyan, Liu Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

The structure of distribution network becomes more and more complex. In order to ensure the safety and stable operation of the system, it is necessary to obtain the current network structure in real time. In order to meet the requirement that the distribution network topology recognition must be fast and accurate, a distribution network topology recognition method based on micro-synchronous Phasor Measurement Unit (μPMU) is proposed. Firstly, the topology identification criterion is constructed by using the voltage and phase data before and after the topology change. Then, a topology recognition algorithm based on phase difference is proposed to analyze the difference between the voltage phase and the actual phase under different topology conditions, and the topology corresponding to the minimum difference is selected as the actual topology to realize the correct recognition of the distribution network. Finally, a simulation example is given to verify the correctness of the proposed method, and the influencing factors of topology recognition are analyzed. The results show that the criterion is correct and reliable, and the proposed topology recognition algorithm has high recognition accuracy. © 2022 IEEE.

关键词： Topology

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Research on PV Low Voltage Ride-Through control Based on RT-LAB Hardware-in-the-Loop 10

Research on PV Low Voltage Ride-Through Control Based on RT-...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Cui, Tongfei Liang, Jifeng Liu, Shiyan Dong, Jingyuan Li, Xiaojun Li, Anyi Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

As a key indicator of whether the photovoltaic power generation system is friendly to the grid, low voltage ride-through is related to the safe and stable operation of the grid. In order to further enhance the low voltage ride-through capability of photovoltaic power generation systems, a low voltage ride through strategy based on RT-LAB hardware-in-the-loop is proposed in this paper. First of all, in view of the problem of disconnection of units caused by the rise of DC side busbar voltage caused by the sudden drop of grid voltage, the correlation coefficient of reducing MPPT operation is introduced, which effectively suppresses the rise of DC side voltage. Then, the underlying control mechanism of photovoltaic inverters is explored. On this basis, the control loop and operating mode of the inverter during the fault are reshaped to limit the overcurrent of the power electronic device. Finally, it is verified on the RT-LAB hardware-in-the-loop simulation platform, and the results show that the strategy works well under different drop depths. Both have good dynamic reactive power support ability, and have better voltage regulation and voltage regulation ability. © 2022 IEEE.

关键词： Hardware-in-the-loop simulation

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Research on Current Balance control of Off-Grid Inverter with Asymmetric Load 11

Research on Current Balance Control of Off-Grid Inverter wit...

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11th China International Conference on Electricity Distribution, CICED 2024

作者： Cui, Tongfei Fang, Fang Li, Xiaojun Yu, Tengkai Zhang, Qi Dong, Jingyuan State Grid Hebei Electric Power Research Institute Hebei Key Laboratory of Energy Internet Simulation Modeling and Control Shijiazhuang China Pingxiang County power supply branch company State Grid Xingtai Power Supply Company Operation and Maintenance Department Xingtai China

ISBN: (纸本)9798350368345

Off-grid inverters can maintain the current output balance even when the load is asymmetrical, which is very important for the efficient and economical operation of the micro-grid system composed of new energy. In this paper, a single three-phase voltage source inverter with unbalanced load is taken as an example to study the unbalanced mechanism, and a simple and effective current balance control strategy is proposed. Firstly, the current output characteristics of off-grid inverter are analyzed when the load is asymmetric. Then, a negative sequence component extraction method based on SOGI is adopted, and an unbalanced current suppression method is designed on the basis of this extraction method. Finally, the PLECS simulation model is used to verify the results. The results show that this strategy can effectively suppress the output current distortion caused by load asymmetry, and obtain high quality current output waveform. © 2024 IEEE.

关键词： asymmetric load current balance negative order component off-grid inverter

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Research on HPFC Coordination control Strategy with PST and UPFC 10

Research on HPFC Coordination Control Strategy with PST and ...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Rong, Shiyang Liang, Jifeng Li, Xiaojun Dong, Jingyuan Zhang, Rui Liu, Xin Tongfei, Cui Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China Hebei Key Laboratory of Distributed Energy Storage and Micro-grid North China Electric Power University Baoding China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

Aiming at the high cost of traditional UPFC and the inability of phase shifting transformer (PST) to continuously regulate power flow, a hybrid HPFC topology consisting of PST and UPFC sharing the same primary excitation winding was proposed. HPFC has both advantages and can achieve accurate control of tidal flow in a large range. Based on introducing HPFC structure and principle of adjustment trend, put forward an effective HPFC control strategy, namely through the expected power control PST tap cutting and comprehensive compensation voltage prediction method combined with a closed-loop UPFC control the output voltage of the way the trend of the system adjustment, the method can effectively decrease the voltage overshoot, speed up the adjustment Finally, in MATLAB/SIMULINK, the model of double-loop power transmission system and double-end power supply system is built to verify its power flow regulation ability. The simulation results prove the feasibility of the proposed control strategy and the precision power flow regulation ability of HPFC, which indicates that HPFC has a good application prospect. © 2022 IEEE.

关键词： Power control

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Research on Economic Dispatch Problem Based on Accelerated Dynamic Adjustment Differential Evolution Algorithm 10

Research on Economic Dispatch Problem Based on Accelerated D...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Li, Anyi Li, Xiaojun Tian, Jiahui Wang, Xinrui Zhang, Rui Qi, Jintao Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China Grid Planning and Research Center State Grid Hebei Economic Research Institute Shijiazhuang China State Grid Hebei Electric Power Research Institute Shijiazhuang China

ISBN: (纸本)9781665452687

In order to save energy, reduce carbon and realize sustainable development, the economic dispatch problem with valve-point effects is studied in this paper. Firstly, summarize the solving methods of economic dispatch problem in the previous literature, and put forward the problems of the current solving methods. Then, an accelerated dynamic adjustment differential evolution algorithm is proposed. By introducing chaotic initialization operation, a nonlinear dynamic adjustment strategy of control parameters is formulated, and an accelerated convergence strategy is proposed to comprehensively improve the performance of the algorithm. Finally, the proposed method is verified by numerical simulation, and compared with other methods in terms of result accuracy and robustness. © 2022 IEEE.

关键词： Numerical methods

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Research on Active Participation of Distributed Photovoltsics in Power Grid Primary Frequency control Strategy

SSRN

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SSRN 2024年

作者： Zhang, Runtao Wang, Lei Zeng, Siming Cheng, Ziwei Su, Can Li, Zhiwei Zhang, Hao State Grid Hebei Electric Power Research Institute Shijiazhuang China Hebei Key Laboratory of Simulation Modeling and Control for Energy Internet Shijiazhuang China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding071003 China

Distributed photovoltaic systems can actively contribute to the primary frequency regulation of the power grid by reserving capacity. Traditional power reduction methods often employ fixed load reduction ratios, potentially resulting in inadequate frequency regulation capacity and unnecessary reserve power. This paper centers on optimizing power reserve control, starting with the construction of a two-stage model for a photovoltaic grid-connected inverter power generation system. It includes the design of a maximum power estimation method and the implementation of photovoltaic power reduction operation. The article proposes a strategy to utilize photovoltaic backup capacity for achieving primary frequency modulation effects in a short time scale. Additionally, it adopts a variable power reserve ratio operation strategy over the long term, aiming to enhance photovoltaic power generation and optimize solar energy utilization without compromising the grid's frequency and quality. Finally, a MATLAB/Simulink model is developed to validate the effectiveness of the control strategy. simulation results indicate that the proposed strategy satisfies frequency regulation requirements, enhances power generation efficiency, and improves the economic viability of photovoltaic operations. © 2024, The Authors. All rights reserved.

关键词： Frequency modulation

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Research on Current Balance control of Off-Grid Inverter with Asymmetric Load

Research on Current Balance Control of Off-Grid Inverter wit...

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China International Conference on Electricity Distribution, CICED

作者： Tongfei Cui Fang Fang Xiaojun Li Tengkai Yu Qi Zhang Jingyuan Dong Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China Operation and Maintenance Department Pingxiang County power supply branch company State Grid Xingtai Power Supply Company Xingtai China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

关键词： Current control Fluctuations Voltage source inverters Distortion Voltage control Frequency control Load modeling

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The Function Mechanism of Virtual Impedance in Grid-forming Droop control and An Adaptive Parameter Tuning Method for Virtual Impedance Based on Network Equivalent Identification

The Function Mechanism of Virtual Impedance in Grid-forming ...

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Power Science and Technology (ICPST), IEEE International Conference on

作者： Chenhui Fan Xiaohui Qin Lei Qi Hongzhi Liu Baodi Ding Zhengji Meng State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China Carbon Neutrality Research Center of Power System China Electric Power Research Institute Beijing China Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

The penetration rate of renewable energy and other power electronic sources in the system continues to increase, the strength of the power grid is weakened, and the system security is challenged. Some converters urgently need to adopt grid-forming control, for example, the droop control. However, due to the different impedance characteristics of the power system environment and the varying electrical distances between the grid source and load, the grid-forming converter cannot adapt to traditional droop control in multi-point parallel operation, this condition can be improved by adding virtual impedance. This paper first derives the main function mechanism of virtual impedance taking droop control as an example, and proposes a virtual impedance adaptive parameter tuning method based on network equivalent identification, then verifies the method through MATLAB/Simulink simulation. The proposal of this method is of great significance for reflecting the operational status of the system, improving the adaptability of renewable energy equipment and stations, and enhancing their fault ride-through ability. It also has important value for improving other grid-forming technologies.

关键词： Renewable energy sources Adaptive systems Power system stability Stability analysis Impedance Security Proposals

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