A protection system and detection method for photovoltaic station domain anti-islanding effect
A protection system, anti-islanding technology, applied in photovoltaic power generation, fault detection according to conductor type, fault location, etc., can solve the problems of passive detection blind spots, power quality degradation and other problems, to improve reliability and economy, improve reliability performance, improving economy
Active Publication Date: 2021-08-27
CHINA SOUTHERN POWER GRID COMPANY +2
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
There are some shortcomings in the traditional island effect detection method. The passive method has detection blind spots, and the active method will cause the power quality to decline due to the disturbance signal applied to the grid.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0024] Such as image 3 As shown, a protection system embodiment of a photovoltaic station domain anti-islanding effect provided by the present invention includes the following units:
[0025] The acquisition unit collects the real-time output signal of the power direction relay installed at the beginning and end of the line AB section and BC section, and transmits it to the analysis unit;
[0026] The analysis unit compares the output signal combination mode of the real-time power direction relay transmitted by the acquisition unit with the output signal of the power direction relay when the islanding effect occurs, and sends a trip command to the control unit if the two are consistent;
[0027] The control unit, when receiving the trip command from the analysis unit, executes the action of disconnecting the circuit...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a protection system for anti-islanding effect in a photovoltaic station area. A power directional relay is installed in a photoelectric power supply line, a collection unit collects the signal of the power directional relay and transmits it to an analysis unit; If the signal combination is consistent, it will send a trip command to the control unit, and the control unit will disconnect the circuit breaker at the common connection point between the photovoltaic system and the power grid. The invention also discloses a detection method for anti-islanding effect in the photovoltaic station area. First, the real-time power direction flowing through the power directional relay is obtained; then the combination of the real-time output signal of the power directional relay and the combination of the output signal of the power directional relay when the islanding effect occurs is compared. , when it is judged that the islanding effect occurs, disconnect the circuit breaker at the common connection point. This technical solution collects and installs the output signal of the power direction relay, and judges whether the islanding effect occurs according to its arrangement and combination, so as to achieve the purpose of anti-islanding protection.
Description
technical field [0001] The invention belongs to the technical field of distributed power generation, and in particular relates to a protection system and a detection method for the islanding effect of a photovoltaic station domain. Background technique [0002] With the development and utilization of new energy, distributed new energy power generation, especially distributed photovoltaic power generation, is more and more widely used. In the distributed generation system, the island effect is an important issue that cannot be ignored. The so-called island effect means that when the power grid breaks due to failure or maintenance, the distributed power generation system and the local load form a closed, self-sufficient power supply island that the power grid cannot control. When the island phenomenon is formed, it will bring many hazards, such as endangering the safety of maintenance personnel on the power grid transmission line; affecting the action program of the protectio...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G01R31/08
CPCG01R31/086H02J3/383H02J3/388Y02E10/56
Inventor 丁晓兵余江张弛李正红陈宏山李捷徐光福魏承志李岩陈俊华秀娟
Owner CHINA SOUTHERN POWER GRID COMPANY