New VDCOL Control Strategy for Voltage Stability in Receiving-End Power Grid of DC System

2012 ◽  
Vol 433-440 ◽  
pp. 3256-3261
Author(s):  
Xiao Ming Liu ◽  
Yu Tian Liu
Keyword(s):  
Control Strategy ◽  
Voltage Stability ◽  
Power Grid ◽  
Dc System ◽  
Hybrid Power ◽  
Operation Conditions ◽  
System A ◽  
Voltage Dependent ◽  
New Type ◽  
Self Adaptive

Voltage stability of AC/DC hybrid power grid is closely related to Voltage Dependent Current Order Limiter (VDCOL). The effects of VDCOL to voltage stability along with serious voltage reduction during or after faults are analyzed in detail. Considering that VDCOL with fixed parameters is difficult to adapt the complexity of operation conditions and ac faults in the receiving-end power grid of dc system, a kind of dynamic self-adaptive VDCOL control strategy is proposed based on the voltage of ac side of converter transformers at inverter side. Simulations of Shandong power grid of China show that the new type of VDCOL is beneficial to voltage stability of receiving-end power grid.

scholarly journals A Preventive Strategy of Voltage Stability based on Characteristic Analysis

2019 ◽  
Vol 115 ◽  
pp. 01001
Author(s):  
Zhen Hu ◽  
Ding Wang ◽  
Yangwu Shen ◽  
Daojun Chen ◽  
Yongyan Liu
Keyword(s):  
Control Strategy ◽  
Power Supply ◽  
Prevention And Control ◽  
Voltage Stability ◽  
Power Grid ◽  
Preventive Strategy ◽  
Characteristic Analysis ◽  
Node Voltage ◽  
And Control ◽  
The Impact

The purpose of voltage stability prevention and control strategy is to minimize the impact of expected accidents on the whole power grid while ensuring safe power supply. In this paper, it is expected that the accident has a large impact on the system voltage and makes the voltage margin of each node low. in order to not only adjust the node voltage, but also reduce the disturbance impact, a voltage stability prevention and control strategy is proposed based on the characteristic analysis.

Geometric Parameterization Technique Based Continuation Power Flow and its Applications in AC/DC Hybrid Power System

2013 ◽  
Vol 732-733 ◽  
pp. 857-863
Author(s):  
Chao Jie Guan ◽  
Jin Quan Zhao ◽  
Jian Hua Yin ◽  
Kun Men ◽  
Chao Hong
Keyword(s):  
Power System ◽  
Power Flow ◽  
Voltage Stability ◽  
Stability Limit ◽  
Hybrid Power System ◽  
Continuation Power Flow ◽  
Dc System ◽  
Hybrid Power ◽  
Dc Power ◽  
Predictor Corrector

A new continuation power flow method based on local geometric parameterization technique is proposed for voltage stability analysis of AC/DC hybrid power system. By means of the alternating iteration method as the AC/DC power flow algorithm, the proposed method takes the coupling relationship between AC and DC systems into account to modify Jacobian matrix of AC system. Constraints of variables in DC system are also considered, as well as the adjustment of converter transformers tap position and the conversion of converters control modes. Based on the predictor-corrector method, this paper adopts the geometric corrector, and changes the direction of convergence effectively. According to different operation modes of AC/DC system, accurate voltage stability limit and the entire PV curve can be acquired. Simulation results of IEEE test systems are used to show the validity of the proposed algorithm.

scholarly journals Numerical and Experimental Study of a Jet-and-Recirculation Stabilized Low Calorific Combustor for a Hybrid Power Plant

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 537
Author(s):  
Felix Grimm ◽  
Timo Lingstädt ◽  
Peter Kutne ◽  
Manfred Aigner
Keyword(s):  
Power Plant ◽  
Heat Loss ◽  
A Priori ◽  
Thermal Power ◽  
Coupled System ◽  
Dynamics Modeling ◽  
Hybrid Power ◽  
Operation Conditions ◽  
System A ◽  
Hybrid Power Plant

An atmospheric prototype burner is studied with numerical and experimental tools. The burner system is designed for operation in a hybrid power plant for decentralized energy conversion. In order to realize such a coupled system, a reliable combustion system has to be established. Numerical and experimental findings in the presented study demonstrate the capabilities of the novel burner system in suitable operation conditions. In this system, a solid oxide fuel cell (SOFC) is mounted upstream of the burner in the gas turbine system. The combination of both realizes a large operational flexibility with comparably high overall efficiency. Since the combustor is operated with SOFC off-gas, several challenges arise. Low calorific combustion needs careful burner design and numerical modeling, since the heat-loss mechanisms occur to be in the order of magnitude of thermal power output. Thus, different modeling strategies are discussed in the paper. The numerical studies are compared with experimental results and high-quality simulation results complement limited measured findings with easy-to-use low fidelity RANS models. A priori measurements are employed for the selection of investigation points. It is shown that the presented combustor system is able to cover low-calorific combustion over a large range of operation conditions, despite major heat-loss effects, which are characterized by means of numerical CFD (Computational Fluid Dynamics) modeling.

scholarly journals On-Site Engineering Test of Active Support Control for the PV Station and Wind Farm in the AC-DC Hybrid Power Grid under Extreme Fault Conditions

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Xiao-ling Su ◽  
Lai-jun Chen ◽  
Jun Yang ◽  
Zhengxi Li ◽  
Peng Zhou ◽  
...  
Keyword(s):  
Power Systems ◽  
Power System ◽  
Control Strategy ◽  
Wind Farm ◽  
Power Grid ◽  
Renewable Energy Sources ◽  
Wind Farms ◽  
System Stability ◽  
Test Results ◽  
Hybrid Power

Power systems have developed significantly because of the increasing share of renewable energy sources (RESs). Despite the advantages, they also bring inevitable challenges to power system stability, especially under extreme fault conditions. This paper presents a practical active support control strategy for RESs to support the power grid under extreme fault conditions. The proof process is taken in an AC-DC hybrid power grid integrated with large capacity of PV stations and wind farms. The on-site engineering test results reflect that RESs bring potential risks in the AC-DC hybrid power grid operation and validate the excellent engineering practical features of the proposed control strategy. In addition, test results also reveal predisposing factors of power system instability which are missing in the simulation and fault simulation device-based testing results. They prove the outstanding advantages of on-site engineering tests.

scholarly journals Research of Coordinated Control Strategy for Multi-UHVDC in AC/DC Hybrid Power Grid

2011 ◽  
Vol 12 ◽  
pp. 443-449
Author(s):  
Shanmei Liu ◽  
Lijie Ding ◽  
Yiqun Miao
Keyword(s):  
Control Strategy ◽  
Power Grid ◽  
Coordinated Control ◽  
Hybrid Power

Application of Lithium Iron Phosphate Battery on Electric Power Engineering

2014 ◽  
Vol 577 ◽  
pp. 560-563
Author(s):  
Ping Chen ◽  
Xin Hu ◽  
Guang Qiang Shun
Keyword(s):  
Electric Power ◽  
Lithium Iron Phosphate ◽  
Power Grid ◽  
Iron Phosphate ◽  
Power Engineering ◽  
System Configuration ◽  
Electric Power Engineering ◽  
Dc System ◽  
Advantages And Disadvantages ◽  
New Type

This paper explores the application of. ithium iron phosphate battery in substation DC system. This paper analyzes the system configuration and the advantages and disadvantages of lithium iron phosphate battery, explores the feasibility and economy of the application of lithium iron phosphate battery in power grid, also summarizes the technical route of lithium iron phosphate battery and provides reference for design of new type of batteries adopted in substation DC system in future.

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