Table of Content

25 February 2023, Volume 45 Issue 2

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Multi-source Complementary Source–Grid Coordination Grid–Load Interaction

Multi-source Complementary

Evaluation on the complementary benefit of a wind-solar combined power generation system with a photothermal power station

MA Zhicheng, LI Weijun, ZHOU Qiang, WANG Dingmei, LYU Qingquan, DONG Haiying

2023, 45(2):  1-9.  doi:10.3969/j.issn.2097-0706.2023.02.001

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Since the complementary benefit of a multi-energy complementary power generation system integrating new energies can hardly be quantified，a complementary benefit evaluation method for a wind-solar combined power generation system with a photothermal power station based on Monte Carlo and credible capacity is proposed. The method sets up the output model of the complementary system based on sequential Monte Carlo，realizing the probabilistic production simulations for the wind turbines，solar panels and photothermal units. According to the calculated credible capacity of the combined power generation system， the evaluation indicators for the system are obtained. By comparing the complementary benefits of a wind-solar-photothermal combined power generation system under different proportions of installed wind turbines and photothermal units， the complementary benefit evaluation for the system is completed. Finally， the evaluation method is verified by IEEE-RTS.The results show that this method can effectively evaluate the complementary benefit of the wind-solar combined power generation system with a photothermal power station.

Robust optimal scheduling of multi-energy cooperative game considering fairness

WANG Yunyun, MA Zhicheng, ZHOU Qiang, DONG Haiying

2023, 45(2):  10-21.  doi:10.3969/j.issn.2097-0706.2023.02.002

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In view of the uncertainty of wind and photovoltaic outputs in multi-energy coordinated optimal operation system under electricity market environment， a robust optimal scheduling model of wind-PV-storage multi-energy cooperative game considering fairness is proposed. Firstly， a multi-energy power system integrated with wind power generators， photovoltaic power generators， pumped storage power stations and photovoltaic thermal power stations （CSPs） is constructed， then a cooperative game optimization scheduling model considering fairness for this power system is established. On the basis of the cooperative game model and robust optimization theory， the model gets robust by introducing robust factors to transform the uncertain constraints into deterministic constraints. The model is analyzed and verified by a power grid in Gansu Province. The analysis shows that the model is flexible and can meet the operation requirements under different stability requirements. The system operator can adjust the inclusiveness of the randomness of the system by adjusting the robust coefficient. Compared with the benefit under non-cooperative game scenario， the overall benefit of the system adopting cooperative game is higher， since giving full play to the advantages of cooperative game can promote the reliable operation of new energy integrated system.

Low-carbon planning of a park-level integrated electric and heating system considering carbon trading and green certificate trading

ZENG Hui, DU Yuan, LI Tao, XUE Yixun, SUN Kaiyuan, XIA Tian, SUN Hongbin

2023, 45(2):  22-29.  doi:10.3969/j.issn.2097-0706.2023.02.003

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As a typical form of integrated energy systems，electro-thermal coupling systems have to be comprehensively and rationally planned， in order to meet the low-carbon transformation demands under the "dual carbon" target. Thus， a low-carbon planning model of a park-level integrated electric and heating system （PIEHS） with photovoltaic system is formulated which takes the carbon emission trading and green certificate trading costs as the optimization objectives. The model comprehensively considers the coupling characteristics of electric and thermal heterogeneous energy flows and the operating characteristics of distributed photovoltaic and energy storage devices. A P6H10 system is utilized to simulate and verify the proposed model in 3 scenarios. The results demonstrate that the carbon trading and green certificate trading mechanisms can effectively promote the planning of low-carbon devices such as distributed photovoltaic， energy storage， and CHP units， which facilitates the low-carbon transformation of the PIEHS. Finally， a sensitivity analysis is carried out on the carbon trading price and green certificate trading price， and the results show that the reasonable prices will reduce the total cost of the PIEHS.

Reliability evaluation on an electric-gas integrated energy system considering weather influence

KONG Zhenyu, LI Hongzhong

2023, 45(2):  30-36.  doi:10.3969/j.issn.2097-0706.2023.02.004

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The reliability evaluation for electric-gas integrated energy system（EGIES） has drawn wide attention in recent years.Since the failure rates of components under different weather conditions are different，the result of the evaluation for EGIES considering weather influence is more objective than that obtained based on the average failure rate of various components. Firstly，the test weather condition of a component in the system are clustered into the existing groups of similar weather conditions by fuzzy clustering，and the correlation degree between the test weather condition and other weather samples in the same group is calculated. Then，the failure rate of the component under the test weather condition is obtained based on its correlation degree and the historical failure rate. Finally，the reliability of the EGIES is analyzed based on the optimal load-reduction model of the system by Monte Carlo method. The calculation results show that the proposed method can effectively obtain the failure rate of a component under a certain weather condition. The influence of taking weather into consideration on the reliability of the power subsystem is more prominent than that of the nature gas subsystem，and the reliability of the power subsystem will be reduced by this influence.

Reliability evaluation on an integrated electric-gas system considering multiple evaluation indexes

KONG Zhenyu, LI Hongzhong

2023, 45(2):  37-43.  doi:10.3969/j.issn.2097-0706.2023.02.005

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The wide application of gas turbines drives the coupling of power network and natural gas network， and the coupling puts forward higher requirements on the reliability of integrated electric-gas systems. Setting comprehensive and reasonable indexes is of great significance for the reliability evaluation of the systems. Based on the established optimal load reduction model of integrated electric-gas systems and traditional reliability evaluation indexes，a new reliability evaluation system for integrated systems that takes the coupling level of electricity and gas and the delay characteristics of the gas supply system into consideration is made. Then， the reliability of the integrated system is analyzed from multiple perspectives by Monte Carlo method. Finally， the reliability evaluation of an integrated electric-gas system composed of a 14-node power system and a 10-node natural gas system is tested. The study results show that the overall reliability of the system is improved by considering the delay characteristics of natural gas.The role of increasing gas turbines' capacities on improving the reliability of power systems is effective but limited.

Source–Grid Coordination

Review on solar thermal power generation technologies and their development

ZHANG Jinping, ZHOU Qiang, WANG Dingmei, LI Jin, LIU Lijuan

2023, 45(2):  44-52.  doi:10.3969/j.issn.2097-0706.2023.02.006

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Under the "dual carbon" target， new energy ushers in a leapfrog development，which makes an higher requirement for power system flexibility. The regulation capacity of concentrating solar power （CSP）plants can rival that of conventional thermal units. CSP plants can participate in peak load and frequency regulations timely and deeply， which improves the flexibility of the power system. Thus，CSP is a promising renewable energy generation technology. Based on the introduction on the operation principle and structure of a CSP plant， the advantages，disadvantages and research progress of various CSP technologies are analyzed. The problems and development direction of CSP technology are discussed based on the status quo and demand of CSP.

Modeling for output characteristics of the partially occluded photovoltaic array based on image singular value decomposition

DING Kun, LIU Zengquan, ZHANG Jingwei, YANG Zenan, LI Zheyu

2023, 45(2):  53-60.  doi:10.3969/j.issn.2097-0706.2023.02.007

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In order to accurately evaluate the power generation performance of a photovoltaic（PV） array under complex partial shading conditions， a modeling method for PV array output characteristics based on image singular value decomposition is proposed. The occlusion type and contour features of the model can be accurately extracted by whale optimization-random singular value decomposition. The locating of occlusion areas can be accurate to a single PV cell. Then the proportion of the occlusion area on each cell is obtained to construct the occlusion state matrix. Based on the single diode model， the partial occlusion model of the PV array is established according to the occlusion state matrix. The modeling realizes the fast and accurate calculation of current-voltage（I-V） characteristics， and supports the generation performance evaluation of PV power plants according to on-site monitoring photos or videos.

Wind power fluctuation mitigation strategy based on double Kalman filter considering the SOC of the energy storage system

MA Yanhong, LYU Qingquan, ZHANG Zhenzhen, ZHAO Long, ZHOU Qiang, GAO Pengfei

2023, 45(2):  61-68.  doi:10.3969/j.issn.2097-0706.2023.02.008

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Since the power fluctuation mitigation strategy for the energy storage system in a wind power-energy storage hybrid system can affect the service life and grid connected power of the battery，a wind power fluctuation mitigation strategy considering the SOC of the energy storage system is proposed based on double Kalman filter. Firstly， the target grid-connected power signal is obtained by double Kalman filter.Then， the optimized energy storage power control command is obtained according to different energy storage power smoothing signal. When the SOC of the battery deviates from the normal operating range in forward or reverse direction， the corresponding optimization energy storage power control signal is sent out to adjust the target wind power grid-connected power. The simulation results show that the proposed method can effectively improve the SOC of the energy storage system，mitigate the fluctuation of wind power， improve the economy of the energy storage system and facilitate the wind power grid connection.

Grid–Load Interaction

Evolution and development concept of the user-side interactive network architecture for new power systems

ZHANG Mengxi, WEI Qi, LIU Min, LI Jiangsheng, ZHANG Wenying, JIN Guangxiang, GUO Huifang

2023, 45(2):  69-76.  doi:10.3969/j.issn.2097-0706.2023.02.009

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In the context of the current energy transformation，the grid connection of a high proportion of new energy sources and the access of massive electronic equipment have led to a surge in data traffic in power systems，and also put forward new requirements on user-side communication network architecture.Based on the business development status and communication requirements of the current power system，Flex Ethernet（FlexE） and Hierarchical Quality of Service （HQoS） technologies that support the user-side interaction of new power systems are systemically analyzed，and the security problems existing on the user side are expounded. Corresponding development suggestions are given to the future challenges faced by the user-side interactive network architecture for new power systems，and the evolution process of the network architecture is systematically carded，so as to provide technical support for the construction of the new power system communication network.

Research on capacity optimization for the user-side energy storage station participating in electric power market

XU Tianyun, CHEN Tao, GAO Ciwei

2023, 45(2):  77-84.  doi:10.3969/j.issn.2097-0706.2023.02.010

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To solve the problems in energy storage systems'participation in power grid frequency regulation ancillary service and energy arbitrage，a capacity optimization configuration for the systems participating in electric power market is proposed.This optimized configuration is verified by the user load data of commercial buildings based on the electricity pricing system of Shanxi Province.The optimization takes the SoC and medium and long-term comprehensive costs and revenues of the batteries under load demand constraints in the mode of frequency regulation ancillary service and energy arbitrage into consideration.Then，an economic optimization model for the battery storage station participating in frequency regulation ancillary service and energy arbitrage is constructed.To minimize the total cost of the energy storage station，and taking battery loss，coupling of frequency regulation power and other factors into consideration，a charging and discharging capacity configuration strategy is designed for the system participating in electricity power market，on the premise of ensuring the user-side power supply.Applying the optimized configuration to a real case，the calculation results show that the proposed method can provide well guidance for the administers of distribution network and commercial complexes to effectively allocate energy capacity and power capacity in energy storage systems in a medium or long period，and to reasonably participate in electric power market according to cost benefit analysis.