A5012426435- HVDC Systems and Fault Protection
- Power System Optimization and Stability
- Microgrid Control and Optimization
- Optimal Power Flow Distribution
- High-Voltage Power Transmission Systems
- Advanced DC-DC Converters
- Fire Detection and Safety Systems
- Fire effects on ecosystems
- Smart Grid Security and Resilience
- Advanced Decision-Making Techniques
- Real-time simulation and control systems
- Electric Power System Optimization
- Wind Energy Research and Development
- Frequency Control in Power Systems
Zhejiang University
2015-2018
Shijiazhuang University
2014
This paper presents a sliding mode robust control based active-power modulation (SMAPM) for voltage source converter multi-terminal HVDC (VSC-MTDC) systems, which could enhance the stability of onshore power system subjected to disturbances by fast changing transmitted VSCs. The development SMAPM includes three steps. First, disturbed ac be divided into two areas with generators sharing different swing modes. center inertia (COI) reference frame is utilized representative area's behavior....
The increasing penetration of renewable sources, particularly wind energy, has provided the power system with large-scale clean electricity. For integrating gigawatt offshore voltage source converter (VSC) based multiterminal HVDC transmission is prospective technology flexible control characteristics. Most papers so far have dealt improving frequency performance caused by an ac disturbance, and only a few deals influence dc outage on performance. However, will bring successive impulses to...
This study presents the analysis of debates on future super grid in China. The rapid increase power demands and uneven distribution energy bases load China require bulk‐capacity long‐distance transmission. Two candidate solutions are thus proposed, that is, ultra‐high‐voltage ac (UHVAC) synchronous extra high‐voltage (EHVAC) asynchronous grid. above two grids first reviewed. then compared detail terms security, economic environmental aspects. Finally, this provides a suggestion for...
A novel unified power flow controller (UPFC)‐based line overload control is presented in this study for system security enhancement. The loads of the transmission lines are monitored real‐time operation and controlled within their thermal limits through a feedback dynamic UPFC. Firstly, relationship between load active setting UPFC deduced. Secondly, law developed, which adjusts intelligently case overloads. Thirdly, implementations above also provided. Using PSS/E, run Nanjing Western Power...
Focused on the challenges raised by large-scale integration of renewable energy resources and urgent goal saving, a novel control scheme for unified power flow controller (UPFC) series converter is proposed to achieve line loss reduction security enhancement in distribution systems with high penetration energy. Firstly, minimum conditions general system loop configurations are deduced. Secondly, constraints including permissible voltage range, loading limits UPFC ratings considered. System...
This study presents a systematic method which enables large-scale alternating current (AC)/direct (DC) power systems to be modelled in the electromagnetic transient (EMT) domain. A physical equivalence based dynamic reduction technique is first proposed reduce AC/DC system, retains backbone network and important components such as high-voltage direct (HVDC) links, whereas low-voltage networks connected are reduced simple composed of components. The on preservation support strength generators...
This paper presents a sliding mode robust control based active-power modulation (SMAPM) for voltage source converter multi-terminal HVDC (VSC-MTDC) systems, which could enhance the stability of onshore power system subjected to disturbances by fast changing transmitted VSCs. The development SMAPM includes three steps. First, disturbed ac be divided into two areas with generators sharing different swing modes. center inertia (COI) refernce frame is utilized representative area¡- s behavior....
With the rising renewable energy penetration and large capacity power infeed, receiving grids are challenged by decreasing rotational inertia as well primary frequency regulation ability increasing single dc infeed power. Based on steady-state transient-state stability constraints, this study proposes a method to calculate critical ratio with different ratio. Taking into consideration ratio, first modified traditional deviation index. Then, electromagnetic transient model of grid is...