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Research on parameter testing method of centralized reactive power compensation device for photovoltaic power station 8

Research on parameter testing method of centralized reactive...

引用

8th Renewable power Generation Conference, RPG 2019

作者： Zhang, Xiaolin Yao, Guangxiu Qin, Xiaodi Dong, Wei Dong, Yinghua State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839531255

The centralized reactive power compensation devices used in photovoltaic power plants have high voltage level and far exceed the capacity of test devices, laboratory/field test conditions can not meet all typical working conditions, and can not obtain model parameters through test data. Therefore, this paper presents a parameter test method for centralized reactive power compensation device based on Hardware-in-the-loop simulation. Firstly, a detailed topological model and a test device model of the centralized reactive power compensation device are established, connecting model with controller of centralized reactive power compensation device through optical and electrical physical interface, the hardware-in-the-loop simulation test platform of centralized reactive power compensation device is established. Then, for all typical operating conditions, a centralized reactive power compensation device model parameter testing method is proposed. Finally, based on the hardware-in-the-loop simulation test platform, the parameters of a certain type of SVG are tested. The test results show that the proposed method is effective. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Hardware-in-the-loop simulation

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The Characteristics and Challenge on Large-Scale Renewable Energy Grid Integration

The Characteristics and Challenge on Large-Scale Renewable E...

引用

2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Yongning, Chi Yan, Li Zhen, Wang Zhen, Li Hongzhi, Liu Zhankui, Zhang China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781728135205

In some regions, for example in Northwest and Northeast China, Northern Germany, Denmark, Spain, Portugal, Ireland or Texas, RE generation supplies a significant amount of the total energy demand. In the future, more and more countries are likely to experience similar situation as RE generation is increasingly considered not only as a means to reduce CO2 emissions, but also as an interesting economic alternative in areas with appropriate RE resources. However, RE generation delivers a variable level of power depending on the wind speed, and is not dispatchable in the same way as conventional energy sources due to the special characteristics. The integration of high penetration level of RE generation in some regions has brought much challenge on maintaining power system reliability and the balance between load and generation. Since the power system were originally designed around large-scale synchronous generators, new approaches and solutions are required when RE generation is integrated into power system with high penetration. This paper provides an introduction about the special characteristics of RE generation, and tries to explore potential challenge caused by the integration of RE generation into power systems. In addition, this chapter will focus on wind and solar power considering their high share in RE generation. © 2019 IEEE.

关键词： Solar energy

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Research on fault ride-through control strategy for DC microgrid with high-proportion renewable generation 5

Research on fault ride-through control strategy for DC micro...

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5th International Conference on Energy Engineering and Environmental Protection, EEEP 2020

作者： Ji, Wanyu W., Dong J., Zhang M., Liu State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China

DC microgrids with high-proportion renewable generation have been popular in the new era of the energy revolution. To improve the fault ride-through capability of DC microgrid, a fault ride-through scheme based on battery storage is proposed. A feed-forward term based on a nonlinear disturbance observer is introduced, and a fault ride-through control strategy based on battery storage under the improved droop control is designed for DC microgrid, which can effectively suppress the DC voltage fluctuations, shorten the voltage recovery time, thereby realizing the fault ride-through of DC microgrid under short-circuit fault in the DC branch. Finally, a model of DC microgrid with high-proportion renewable generation is established in Simulink, and simulation results verify the proposed scheme and the designed fault ride-through control strategy. © Published under licence by IOP Publishing Ltd.

关键词： Electric batteries

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Analysis of fatigue life loss of drivetrain of doubly-fed wind turbines under short-circuit fault of power grid 8

Analysis of fatigue life loss of drivetrain of doubly-fed wi...

引用

8th Renewable power Generation Conference, RPG 2019

作者： Shilong, Qiu Hui, Li Lijiao, Gong Bin, Wang Zhaoseng, Chai You, Wu Department of Mechanical and Electrical Engineering Shihezi University Shihezi China State Key Laboratory of Power Drivetrain Equipment and System Security Chongqing University Chongqing China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (纸本)9781839531255

The shafting drivetrain of the doubly fed wind turbine is the part with the highest failure rate. The electromagnetic torque fluctuation caused by the grid fault easily results in the torsional vibration fatigue loss of the shaft. Accordingly, the influences of drivetrain fatigue life loss under different grid faults require investigation. Firstly, the four-mass model of the drivetrain is constructed on the basis of MATLAB/Simuhnk. Secondly, the electromagnetic torque response under short-circuit fault of the grid is obtained via model simulation. Finally, the effects of different types of grid faults on the fatigue life of the drivetrain are analysed through Mlife. Results show that the electromagnetic torque fluctuation load generated by grid fault has no apparent influence on the fatigue life of the drivetrain in the short term. but the cumulative effect of short-term damage will aggravate the fatigue life loss of the drivetrain and increase the failure risk of the component. The electromagnetic torque generated by the three-phase symmetrical short-circuit is the most violent and has the maximum effect on the fatigue life of the drivetrain. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Timing circuits

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General modelling method for impedance of voltage source converter 8

General modelling method for impedance of voltage source con...

引用

8th Renewable power Generation Conference, RPG 2019

作者： Wang, Zhibing Liu, Hongzhi Li, Qing Wang, Weishen State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839531255

Voltage source converters (VSC) have been widely used in renewable energy generation, flexible ac/dc transmission and energy transfer devices, which result in a lot of system transient stability problems, but essential cause and the physical significance are not yet systematically analysed. Firstly the paper researches the working principle and stable mode of typical voltage source converters, when considering control strategy, circuit parameters and other influencing factors, and then, the general mathematical model of AC side and DC side impedance of voltage source converters is established with internal dynamic process based on the stationary reference frame. On this basis, all of states are studied on the influence of output impedance amplitude of VSC for the operation characteristics, the influence domain characteristics of impedance for the operation stability of converter, and the key components or parameters that affect the output impedance amplitude. In the meanwhile, the frequency-domain analysis is developed to verify the correctness of above results. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Frequency domain analysis

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Study on control strategy of large-scale renewable energy connect to LCC-HVDC system 16

Study on control strategy of large-scale renewable energy co...

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16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Li, Yan Liu, Hongzhi Tian, Xinshou Wang, Zhibing China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (纸本)9781839533914

One of the important issues facing large-scale renewable energy development is to ensure the maximum consumption of large-scale renewable energy bases and the safe and stable operation of the power grid after connect. The research results show that when large-scale renewable energy generation is connected to the power grid, its volatility, randomness and intermittentness will have a certain impact on the system power balancing, reactive voltage and transient stability of the power grid. Renewable energy connect to LCC-HVDC is one of the commonly used long-distance large-scale power transmission methods. On the one hand, in order to ensure stable operation, the LCC-HVDC system needs to provide sufficient reactive power support for itself and the system. On the other hand, for large-scale renewable energy power stations, the collection lines are often long, and each renewable energy generator usually uses its own optimal operation as the control target, which causes reactive voltage control problems and harmonic amplification in the power station problem. Therefore, in order to coordinate the reactive power coordination and voltage regulation after the renewable energy is connected to the LCC-HVDC system, this paper studies the large-scale renewable energy power generation LCC-HVDC transmission connection and the supporting technology required for the development of renewable energy power generation. And the use of guidance is of great significance to help increase the accommodation space of large-scale renewable energy generation. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： Renewable energy resources

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Analysis of renewable energy primary frequency control strategy 16

Analysis of renewable energy primary frequency control strat...

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16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Li, Yan Tian, Xinshou Liu, Chao Tang, Haiyan China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (纸本)9781839533914

The ability of a renewable energy to achieve inertia and primary frequency regulation depends on its control technology, and its frequency support capability is also closely related to its operating conditions. For example, for wind turbines, under different operating conditions, the rotor speed is different, and the kinetic energy stored in it is different. The change in speed will also affect the capture of wind power. Therefore, the virtual moment of inertia is not constant. At the same time, in the case of adopting the normal reserve method to achieve the frequency control capability once, it will inevitably bring a certain amount of power electricity loss. Therefore, when a large number of asynchronous power generators need to be connected to the power grid, the inertia of the system needs to be re-evaluated. The ability of asynchronous power generators to provide inertia and the frequency control needs to be fully understood. This paper studies the influence of inertia and primary frequency control on the grid-connected power system of non-synchronous power supplies, so as to put forward appropriate requirements for the virtual inertia and primary frequency control capabilities of wind turbines and photovoltaic power generation, and promote the virtualization of wind turbines and photovoltaic power generation equipment in inertia control and primary frequency control technology. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： Solar energy

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control requirement and key issue for renewable energy connect to VSC-LCC hybrid HVDC system 16

Control requirement and key issue for renewable energy conne...

引用

16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Li, Yan Liu, Hongzhi Wei, Chunxia Wang, Zhibing China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (纸本)9781839533914

Large-scale renewable energy cannot be absorbed locally and needs to be transmitted to the load center over a long distance. Moreover, wind power and photovoltaic power generation are random and intermittent, and their power pooling and long-distance large-capacity power transmission become a very challenging technical problem. When LCC-HVDC is applied to large-scale wind power/photovoltaic power connection, because wind farms/photovoltaic power plants alone cannot provide stable AC voltage, LCC-HVDC needs to be bundled with thermal power or matched with large-capacity STATCOM. Because VSC-HVDC is limited by the existing technology, the cable construction cost is too high, the converter loss is relatively large, and the cost of large-scale power transmission is high. When LCC-HVDC or VSC-HVDC is separately applied to large-scale renewable energy connection, both DC transmission technologies have their own shortcomings. And if the two DC converter technologies are combined, the multi-terminal DC transmission (VSC-MTDC) composed of VSC-HVDC completes the wind/photovoltaic power collection, and then the ultra-long-distance transfer of power is completed by LCC-HVDC. The two converter technologies achieve complementary advantages and are expected to become a solution to the technical problems of large-scale wind power/photovoltaic power pool power collection and long-distance large-capacity power transmission technology, thereby promoting the use of large-scale renewable energy in China. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： HVDC power transmission

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Fault Diagnosis Method of Distributed power Distribution Network Based on Advanced Petri net 29

Fault Diagnosis Method of Distributed Power Distribution Net...

引用

第29届中国控制与决策会议

作者： Liu Yunjia Gao Yiwei Liu Jialiang Chu Yongjin State Key Laboratory of Operation and control of Renewable Energy & Storage Systems China Electric Power Research Institute School of Information Science & Engineering Northeastern University

ISBN: (纸本)9781509046584

A DG-based distributed fault diagnosis method based on BP neural network with dynamic adaptive fuzzy Petri nets is proposed to solve the problem that traditional fault diagnosis methods lead to complex matrix and switching *** this paper,the general fault diagnosis model is constructed,and the simplified model of protection information is processed in the form of *** the operation mode and protection are changed,the model need not be reestablished,and the logic of the protection circuit breaker error correction is used with high fault ***,BP algorithm is used to train the fuzzy parameters in the ***,simulation test is carried out for the distribution network with DG,which verifies the reliability and fastness of the method.

关键词： Petri net distributed power supply fault diagnosis BP algorithm

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DC/DC Converter Applied in the Photovoltaic- Inclined Thermal Collector Hybrid systems for Brackish Water Desalination

DC/DC Converter Applied in the Photovoltaic- Inclined Therma...

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11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Liqiang Yuan Mohamed Eltawil Zhengming Zhao Yaodong Lu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department o State Key Laboratory of Control and Simulation of Power System and Generation EquipmentDepartment of

A chronic drinking water shortage is one of the most important issues in the developing countries, and drinking water from dirty water sources causes serious damage to inhabitants health in some remote areas. The solar distillation remains the most favorable process for the supplying of water to small communities. Base on the traditional solar still, an improved hybrid photovoltaic/thermal (PVT) desalination system is presented. The PV modules that are combined with thermal units, constitute the PVT systems which has longer operating time and higher average fresh water production. This paper introduces the DC/DC converter applied in this type of systems, including its structure and control strategy which is suitable for PV array and driving supportive heater. The experimental results for the converter and the whole system are showed and analyzed.

关键词： DC-DC power converters Photovoltaic systems Solar power generation Desalination Temperature Water resources Hybrid power systems Solar energy Water heating power system simulation

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