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1
Content available Research on influencing factors of emergency power support for voltage source converter-based multi-terminal high-voltage direct current transmission system
Li Congshan, Zhen Zikai, Sheng Tingyu, Liu Yan, Zhong Pu, Zhang Xiaowei
Archives of Electrical Engineering
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2022
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Vol. 71, nr 4
881--894
EN
Voltage source converter-based multi-terminal high-voltage direct current (VSCMTDC) transmission system can realize a multi-point power supply, multi-drop power receiving, and mutual coordination between the converter stations to ensure the reliability of the transmission. Based on the PSCAD/EMTDC platform, a five-terminal DC transmission system model is established. According to the fast power regulation capability and overload capacity of theVSC-MTDC power transmission system, an analysis of additional emergency power support for a transmission system under large disturbance conditions was carried out. A new control strategy for emergency power support that introduces its basic principle is proposed in this paper. It uses the short-term overload capability of the DC system. By changing the power reserve of the converter station and the electrical distance between the converter stations, the influence of the power reserve and the electrical distance on the emergency power supply guarantee is analyzed the stability of the system is improved, thereby improving the sudden change of power caused by voltage fluctuations, and the feasibility of the control module is verified by PSCAD simulation. The simulation results show that when the system power supply suddenly changes, the converter stations at a short distance and large power reserve has a better effect on emergency power supply protection. A comparative study of the active power support of a single converter station and multiple converter stations is carried out. The research results show that the use of emergency power support in the DC transmission system has a good effect on maintaining the stability of the inter-connection system and the reliability of the power supply.
2
Content available Research on regional emergency DC power support strategy of VSC-MTDC transmission system
Li Congshan, Sheng Tingyu, Fang Yan, Li Yikai
Archives of Electrical Engineering
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2021
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Vol. 70, nr 1
145--160
EN
In the asynchronous interconnected power grid that is composed of the multiterminal voltage-source converter high voltage direct current (VSC-MTDC) system, the control methods of each converter station and the frequency of the connected AC systemare not the same. When a fault occurs in any place of the asynchronous interconnected system, it will cause the system to have power shortage or surplus, affecting the safe and stable operation of the interconnected power grid. In order to solve the problem of insufficient regional active power reserve, based on the VSC-MTDC asynchronous regional interconnection system and the principle of regional sharing, the dynamic power controller under disturbance conditions is established, and the controller parameters are set to achieve the accuracy of unbalanced power in the disturbance area measuring. Then, according to the degree of the disturbance power, considering the factors that affect the support effect of the converter station, an emergency DC power support (EDCPS) scheme under different power disturbances is formulated to achieve power compensation for the disturbance area. Basedon PSCAD/EMTDC software, the proposed control strategy is simulated. The result showst hat the converter station closer to the disturbance area has a better support effect, and the dynamic active power controller can timely and accurately deliver to the disturbance area when the active power reserve is insufficient.
3
Content available Coordinated control strategy for microgrid stability maintenance under isolated island operation
Wu Pan, Xu Xiaowei
Archives of Electrical Engineering
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2021
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Vol. 70, nr 2
285--295
EN
In this study, the inverter in a microgrid was adjusted by the particle swarm optimization (PSO) based coordinated control strategy to ensure the stability of the isolated island operation. The simulation results showed that the voltage at the inverter port reduced instantaneously, and the voltage unbalance degree of its port and the port of point of common coupling (PCC) exceeded the normal standard when the microgrid entered the isolated island mode. After using the coordinated control strategy, the voltage rapidly recovered, and the voltage unbalance degree rapidly reduced to the normal level. The coordinated control strategy is better than the normal control strategy.
4
Content available Research on emergency DC power support coordinated control for hybrid multi-infeed HVDC system
Li Congshan, Li Yikai, Guo Jian, He Ping
Archives of Electrical Engineering
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2020
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Vol. 69, nr 1
5--21
EN
Based on the respective characteristics of line-commutated converter highvoltage direct current (LCC-HVDC) and voltage-source converter high voltage direct current (VSC-HVDC), two additional emergency DC power support (EDCPS) controllers are designed, respectively. In addition a coordinated control strategy based on a hybrid multi-infeed HVDC system for EDCPS is proposed. Considering the difference in system recovery between LCC-HVDC and VSC-HVDC in EDCPS, according to the magnitude of the amount of potential power loss, the LCC-HVDC and VSC-HVDC priority issues of boosting power for EDCPS are discussed in detail. Finally, a hybrid three-infeed HVDC that consists of two parallel LCC-HVDCs and one VSC-HVDC that is built in PSCAD/EMTDC are simulated. The effectiveness of the proposed approach is verified based on this hybrid three-infeed HVDC system.
5
Content available Intelligent multi-agent system for DC microgrid energy coordination control
Qaderi-Baban P., Menhaj M. B., Dosaranian-Moghadam M., Fakharian A.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2019
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Vol. 67, nr 4
741--748
EN
In this paper, an energy coordination control method based on intelligent multi-agent systems (MAS) is proposed for energy management and voltage control of a DC microgrid. The structure of the DC microgrid is designed to realize the mathematical modeling of photovoltaic cells, fuel cells and batteries. A two-layer intelligent MAS is designed for energy coordination control: grid-connection and islanding of a DC microgrid is combined with energy management of PV cells, fuel cells, loads and batteries. In the hidden layer and the output layer of the pro-posed neural network there are 17 and 8 neurons, respectively, and the “logsig” activation function is used for the neurons in the network. Eight kinds of feature quantities and 13 different actions are taken as the input and output parameters of the neural network from the micro-source and the load, and the as the control center agent’s decision-makers. The feasibility of the proposed intelligent multi-agent energy coordination control strategy is verified by MATLAB/Simulink simulation, and three types of examples are analyzed after increasing the load. The simulation results show that the proposed scheme exhibits better performance than the traditional approaches.
6
Content available Hierarchiczny system sterowania siecią wodociągową z zastosowaniem radiowej infrastruktury komunikacyjnej
Karla T., Tarnawski J., Duzinkiewicz K.
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
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2015
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Nr 47
79--82
PL
W artykule przedstawiono proces budowy hierarchicznego systemu sterowania ilością i jakością wody w sieci dystrybucji wody pitnej miasta Chojnice. Do badań wykorzystano model szkieletowy opracowany w środowisku Epanet. Dokonano dekompozycji, zaproponowano strukturę systemu regulacji, w warstwie bezpośredniej sprawdzono różne rodzaje regulacji: zdarzeniowo-regułowe, PID oraz MPC. Zaproponowano bezprzewodowe metody komunikacji pomiędzy punktami monitorowania i sterowania. Dokonano badań symulacyjnych poprawności działania zaproponowanego systemu sterowania.
EN
Drinking Water Distribution Systems (DWSW) are most important sectors of infrastructure, both for individuals and industry. In both cases it is necessary to provide a suitable amount of water at all times during a day. In the case of individual customers it is very important to ensure good quality of the water supply, since in many cases it is directly consumed by customers. The DWDS from the perspective of control engineer is a multi-dimensional, nonstationary object with variable delays and uncertainty. So it is a very complex object, and geographically distributed. The article presents the process of building a hierarchical control of quantity and quality of water in the DWDS of the city Chojnice. In purpose of application of decentralized control DWDS was decomposed and subsystems were created. Different types of regulation: event-driven-rulebased, PID and MPC were tested. Coordination among subsystems was necessary to obtain sufficient quality of control. Wireless communication between monitoring and control points is introduced. Simulation studies were preformed to confirm proper operation of the proposed control system.
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