Kanjun Zhang
YOU?
Author Swipe
Protection adaptability analysis method for photovoltaic grid-connected generating system Open
Inverter power sources such as photovoltaic inverters and SVG have unique fault characteristics compared to traditional synchronous motors due to their unique power generation methods, circuit topology, and low-voltage traversal control st…
Research on load transfer planning model for equipment maintenance in the substation Open
The maintenance, inspection, and refurbishment of substation equipment are crucial for ensuring the stability of the power grid’s operation and the reliability of power supply to users. However, currently, there is a lack of methods for ra…
Analysis of an accident of abnormal increase in pole bus differential current caused by DC line faults Open
This paper analyzes an accident of abnormal increase of pole bus differential current and pole differential current of a converter station caused by line fault of a ±800 kV extra high-voltage direct current transmission project. After a li…
Research on load frequency control of multi‐microgrids in an isolated system based on the multi‐agent soft actor‐critic algorithm Open
Load variation, distributed power output uncertainty and multi‐microgrids network complexity have brought great difficulties to the frequency stability of the whole microgrid. To address this problem, this paper uses a multi‐agent deep rei…
Composite power system risk evaluation considering the accurate model of renewable power output Open
The fluctuation of renewable energy will threaten the reliable operation of the composite transmission and generation power system, so the risk level of the composite system with renewable energy attached must be studied. However, the accu…
View article: An accurate equivalence method of distribution system for transmission system operational reliability assessment
An accurate equivalence method of distribution system for transmission system operational reliability assessment Open
In the modern power system, the uncertainty on the power supply and electrical load will aggravate the volatility in the transmission system. Therefore, the accurate operational reliability evaluation of the transmission system is very imp…
View article: Research on Pilot Protection for Tie Line of Renewable Energy Sources
Research on Pilot Protection for Tie Line of Renewable Energy Sources Open
With the continuous increase in the proportion, renewable energy sources have brought great challenges to the traditional protection based on fundamental frequency, due to their complex short-circuit current characteristics which are diffe…
Research of “one key sequence control” test method based on panoramic digital simulation technology Open
Aiming at the problem that the current “one key sequence control” system cannot effectively carry out the test work after being deployed in a substation project, a “one key sequential control” test method based on panoramic digital simulat…
Research and analysis on suppression and influence of transformer direct current bias Open
DC bias generates a large DC component in the windings of the transformer in operation, thereby generating harmonics, causing vibration, noise, and overheating. In severe cases, it can cause damage to the transformer, which will affect the…
Research on load frequency control of multi-microgrids in an isolated system based on the multi-agent soft actor-critic algorithm Open
Due to the limited capacity of a single microgrid, multiple sub-microgrids form interconnected multi-microgrids. However, load variation, distributed power output uncertainty and multi-microgrids network complexity have brought great diffi…
A multi-stakeholder potential game model in active distribution network considering the bounded rationality of small users Open
The increase in the penetration rate of distributed renewable energy sources has brought unprecedented challenges to the economic and stable operation of the active distribution network (ADN). To improve the operating efficiency and total …
Study on a small‐signal analysis method for PMSG considering LVRT control and frequency regulation Open
In a high proportion of new energy grids or a 100% new energy source of power grid, the dynamic performance of PMSG under fault conditions is very important. However, the current small signal model lacks detailed and deep analysis of a per…
Principle of Distributed Bus Protection Based on Directional Impedance Component Comparison Open
Distributed bus protection is one of the main tasks of smart substation construction to improve the secondary system because it is economical, simple, easy to layout, and easy to realize double. This paper mainly considers that distributed…
Risk Assessment of Main Electrical Connection in Substation With Regional Grid Safety Constraints Open
To ensure the safe and stable operation of the power grid, it is necessary to carry out the risk assessment of the main electrical connection in the substation. In traditional methods, the influences of the regional power grid on the main …
New Principle of Fault Data Synchronization for Intelligent Protection Based on Wavelet Analysis Open
In order to eliminate the influence of the delay error of the sampled value in the data link on the longitudinal differential protection device, this paper proposes a protection data self-healing synchronization algorithm based on wavelet …
Short-circuit model of the DFIG considering coordinated control strategy of grid- and rotor-side converters Open
The short-circuit current calculation is of vital importance for the power system. With a high proportion of new energy sources, the setting of relay protection and the selection of electrical equipment have been severely degraded. An accu…
Research on reliability evaluation method of protection system based on Kaplan-Meier and GO method Open
In the reliability analysis of the traditional substation protection system, methods such as minimum path set method, fault tree method and Markov method are mostly used. These three methods have disadvantages such as large amount of calcu…
Reliability evaluation of high voltage direct current transmission protection system based on interval analytic hierarchy process and interval entropy method mixed weighting Open
As the core of the secondary part of the high voltage direct current transmission (hereinafter referred to as HVDC) transmission system, HVDC protection is the first line of defense for the safe and reliable operation of the HVDC transmiss…
Study on Optimal Operation Mode of One-key Sequence Control in Substation Open
At present, some substations have carried out sequential control pilot applications, but there are generally problems such as inconsistent operation methods, narrow operation coverage, incomplete typical functions, and complicated manual i…
Research on integrated measurement and control device and test technology in smart substation Open
According to the problems of low system integration, no redundant configuration and wide fault influence range of the measurement and control device, this paper research on the scheme of integrated measurement and control device in smart s…
Research on Advanced Application Configuration Design Technology of Smart Substation Open
The application transparency of secondary equipment in Smart Substation is low, the logical linkage is poor, and the intercommunication ability of equipment from different manufacturers is limited, which seriously restricts the promotion a…
Mixed Weibull distribution model of DC protection system based on entropy weight method Open
By analyzing the blocking event of DC converter station of the State Grid Corporation in recently ten years, it can be concluded that the sampling system failure, secondary circuit fault, board fault, host fault, etc. of the protection sys…
A Joint Verification System for the Secondary Equipment Safety Measures in Smart Substation Open
The secondary system of smart substation has high characteristics of network and integration. The secondary circuit and its safety measures are characterized by strong concealment and poor visualization. There is a great safety risk in the…
Research on Classification of Substation Background Information for Monitoring Open
The substations are important parts of modern electrical grids. The monitoring of background information in substations should be carefully managed to keep the smoothly operating of the electrical system. However, there are still some prob…