CN112731014A - Island detection method and device for direct-current interconnected power distribution system - Google Patents
Island detection method and device for direct-current interconnected power distribution system Download PDFInfo
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Abstract
本发明公开了一种直流互联配电系统的孤岛检测方法以及装置，孤岛检测方法采用被动检测的方式对直流互联配电系统的孤岛状况进行检测，通过对直流互联配电系统中连接变压器的电压参数进行检测，并分析电压参数的相位变化量以及频率变化率，从而识别直流互联配电系统是否产生孤岛现象，与现有技术相比较，本技术方案避免了采集频率变化的累计值和设置功率调整环节，直接考虑频率变化率，提高了检测的准确性和灵敏度。
The invention discloses an islanding detection method and device for a DC interconnected power distribution system. The islanded detection method adopts a passive detection method to detect the islanding condition of the DC interconnected power distribution system. Parameters are detected, and the phase change amount and frequency change rate of voltage parameters are analyzed, so as to identify whether the DC interconnected power distribution system has islanding phenomenon. In the adjustment process, the frequency change rate is directly considered, which improves the detection accuracy and sensitivity.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an island detection method and an island detection device of a direct-current interconnected power distribution system.
Background
In the electric power system, the flexible direct current interconnection technology is mainly used for helping an alternating current-direct current hybrid power distribution network to flexibly control the transmission power, the efficient access of alternating current-direct current power generation and power utilization equipment is guaranteed during normal operation, the cross-region power support is rapidly realized under the fault state, and the flexible direct current interconnection technology has a good effect of improving the power supply reliability and the power supply quality of a high-load district of a city.
In the operation process of the flexible direct current interconnection power distribution system, a fault working condition may exist so as to cause an islanding phenomenon of the system, wherein the islanding phenomenon refers to that when the power grid is disconnected, the alternating current system still supplies power to a local load, so that a self-sufficient power supply islanding which cannot be controlled by a public power grid system is formed. The islanding phenomenon may adversely affect system equipment and user-side equipment of the entire power distribution network, and therefore, it is necessary to detect whether the islanding phenomenon occurs in the system operation process.
In the prior art, an island detection scheme of a power distribution system mainly aims at an interconnected power distribution system running in parallel with alternating current and direct current, and is not suitable for a power transmission system (namely a direct current interconnected power distribution system) completely connected by a direct current line. After the island, the frequency rises quickly, a power adjustment link is set, and the power fixed value is updated continuously, so that the voltage fluctuation of the receiving end system is large, and the power supply quality of the receiving end system is influenced.
Disclosure of Invention
The present invention is directed to a method and an apparatus for detecting an islanding of a dc interconnection power distribution system, so as to solve one or more technical problems in the prior art, and provide at least one useful choice or creation condition.
The technical scheme adopted for solving the technical problems is as follows:
an island detection method for a direct-current interconnected power distribution system, wherein the direct-current interconnected power distribution system comprises a main network power supply, a load power grid, a connecting transformer, a converter station and a plurality of alternating-current systems for supplying power to the load power grid, the main network power supply supplies power to the load power grid, the alternating-current systems are all connected with a primary winding of the connecting transformer through the converter station, a secondary winding of the connecting transformer is connected with the load power grid, and the island detection method comprises the following steps:
step 100, setting a sampling frequency, a maximum phase variation, a minimum phase variation and a frequency variation rate threshold;
200, detecting voltage parameters of the connecting transformer, and analyzing the phase and frequency of the voltage parameters;
step 300, calculating a difference value between the phase of the voltage parameter at the current moment and the phase of the voltage parameter at the previous moment, and defining the difference value as a real-time phase variation;
step 400, comparing the real-time phase variation with the maximum phase variation, if the real-time phase variation is larger than the maximum phase variation, proving that the direct-current interconnected power distribution system generates an island phenomenon, and controlling the direct-current interconnected power distribution system to be switched into an island operation mode, otherwise, continuing to execute the operation downwards;
step 500, comparing the real-time phase variation with the minimum phase variation, and if the real-time phase variation is greater than the minimum phase variation, calculating a frequency variation rate of the voltage parameter at the current moment, and recording the frequency variation rate as a real-time frequency variation rate;
step 600, comparing the real-time frequency change rate with the frequency change rate threshold, if the real-time frequency change rate is greater than the frequency change rate threshold, proving that the direct-current interconnected power distribution system generates an island phenomenon, and controlling the direct-current interconnected power distribution system to switch to an island operation mode.
As a further improvement of the above technical solution, the step 100 further includes setting a time threshold, and the step 600 further includes calculating a duration time in the state if the real-time frequency change rate is greater than the frequency change rate threshold, comparing the duration time with the time threshold, and if the duration time is greater than the time threshold, proving that the dc interconnection power distribution system generates an islanding phenomenon, and controlling the dc interconnection power distribution system to switch to an islanding operation mode.
As a further improvement of the above technical solution, the sampling frequency is set to 1000 times per second, the time threshold is set to 40 milliseconds, the maximum phase change amount is set to 50 degrees, the minimum phase change amount is set to 25 degrees, and the frequency change rate threshold is set to 50.
The invention also discloses an island detection device of the direct-current interconnected power distribution system, the direct-current interconnected power distribution system comprises a main network power supply, a load power grid, a connecting transformer, a converter station and a plurality of alternating-current systems, the main network power supply supplies power to the load power grid, the alternating-current systems are all connected with a primary winding of the connecting transformer through the converter station, a secondary winding of the connecting transformer is connected with the load power grid, and the island detection device comprises:
the initialization module is used for setting sampling frequency, maximum phase variation, minimum phase variation and a frequency variation rate threshold;
the acquisition module is used for detecting the voltage parameters of the connecting transformer and analyzing the phase and the frequency of the voltage parameters;
the first calculation module is used for calculating the difference value between the phase of the voltage parameter at the current moment and the phase of the voltage parameter at the previous moment, and defining the difference value as a real-time phase variation;
the first comparison module is used for comparing the real-time phase variation with the maximum phase variation;
the second comparison module is used for comparing the real-time phase variation with the maximum phase variation;
the second calculation module is used for calculating the frequency change rate of the voltage parameter at the current moment and recording the frequency change rate as a real-time frequency change rate;
the third comparison module is used for comparing the real-time frequency change rate with the frequency change rate threshold value;
and the control module is used for controlling the direct-current interconnected power distribution system to be switched into an island operation mode when the real-time phase variation is greater than the maximum phase variation, or when the real-time phase variation is smaller than the maximum phase variation, the real-time phase variation is greater than the minimum phase variation, and the real-time frequency variation rate is greater than the frequency variation rate threshold value, so that the direct-current interconnected power distribution system is controlled to be switched into the island operation mode.
As a further improvement of the above technical solution, the present technical solution further includes a third calculating module, where the third calculating module is configured to calculate a duration time in the state when the real-time frequency change rate is greater than the frequency change rate threshold;
the initialization module is further used for setting a time threshold;
the control module is configured to control the dc interconnected power distribution system to switch to an island operation mode when the real-time phase variation is smaller than the maximum phase variation, the real-time phase variation is larger than the minimum phase variation, the real-time frequency variation is larger than the frequency variation threshold, and the duration is larger than the time threshold.
As a further improvement of the above technical solution, the sampling frequency is set to 1000 times per second, the time threshold is set to 40 milliseconds, the maximum phase change amount is set to 50 degrees, the minimum phase change amount is set to 25 degrees, and the frequency change rate threshold is set to 50.
The invention has the beneficial effects that: this technical scheme adopts the mode of passive detection to detect DC interconnection distribution system's island situation, detect through the voltage parameter of connecting the transformer among the DC interconnection distribution system, and the phase variation volume and the frequency change rate of analysis voltage parameter, thereby whether discernment DC interconnection distribution system produces the island phenomenon, compare with prior art, this technical scheme has avoided the accumulative value of collection frequency change and has set up the power adjustment link, the direct frequency change rate of considering has improved the accuracy and the sensitivity that detect.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
FIG. 1 is a schematic diagram of the DC interconnect power distribution system of the present invention;
fig. 2 is a schematic flow chart of an island detection method of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, the application discloses an island detection method for a direct-current interconnected power distribution system, wherein the direct-current interconnected power distribution system comprises a main network power supply, a load power grid, a connecting transformer, a converter station and a plurality of alternating-current systems for supplying power to the load power grid, the main network power supply supplies power to the load power grid, the alternating-current systems are connected with a primary winding of the connecting transformer through the converter station, and a secondary winding of the connecting transformer is connected with the load power grid.
The first embodiment of the island detection method of the present application includes the following steps:
step 100, setting a sampling frequency, a maximum phase variation, a minimum phase variation and a frequency variation rate threshold;
step 200, detecting a voltage parameter of the connection transformer, and analyzing a phase and a frequency of the voltage parameter, wherein the voltage parameter can be from a primary winding of the connection transformer or a secondary winding of the connection transformer;
step 300, calculating a difference value between the phase of the voltage parameter at the current moment and the phase of the voltage parameter at the previous moment, and defining the difference value as a real-time phase variation;
step 400, comparing the real-time phase variation with the maximum phase variation, if the real-time phase variation is larger than the maximum phase variation, proving that the direct-current interconnected power distribution system generates an island phenomenon, and controlling the direct-current interconnected power distribution system to be switched into an island operation mode, otherwise, continuing to execute the operation downwards;
step 500, comparing the real-time phase variation with the minimum phase variation, and if the real-time phase variation is greater than the minimum phase variation, calculating a frequency variation rate of the voltage parameter at the current moment, and recording the frequency variation rate as a real-time frequency variation rate;
step 600, comparing the real-time frequency change rate with the frequency change rate threshold, if the real-time frequency change rate is greater than the frequency change rate threshold, proving that the direct-current interconnected power distribution system generates an island phenomenon, and controlling the direct-current interconnected power distribution system to switch to an island operation mode.
Specifically, in the embodiment, an islanding condition of the direct current interconnected power distribution system is detected in a passive detection mode, so that the defect that harmonic waves are injected into a power grid to further influence the quality of electric energy is overcome; this embodiment detects the voltage parameter of connecting the transformer among the interconnected distribution system of direct current to phase variation and the frequency rate of change of analysis voltage parameter, thereby discernment interconnected distribution system of direct current whether produces the island phenomenon, compares with prior art, and the cumulative value of collection frequency change and setting up the power adjustment link have been avoided to this embodiment, and the frequency rate of change is directly considered, has improved the accuracy and the sensitivity that detect.
Further as a preferred implementation manner, in this embodiment, the step 100 further includes setting a time threshold, and the step 600 further includes calculating a duration time in the state if the real-time frequency change rate is greater than the frequency change rate threshold, comparing the duration time with the time threshold, and if the duration time is greater than the time threshold, proving that the dc interconnection power distribution system generates an islanding phenomenon, and controlling the dc interconnection power distribution system to switch to an islanding operation mode.
Specifically, in this embodiment, the duration of the state where the real-time frequency change rate is greater than the frequency change rate threshold needs to be calculated, and it is determined whether the direct-current interconnected power distribution system generates an islanding phenomenon according to the duration, so that the accuracy of islanding detection in this embodiment can be further improved.
Further preferably, in this embodiment, the sampling frequency is set to 1000 times per second, the time threshold is set to 40 milliseconds, the maximum phase change amount is set to 50 degrees, the minimum phase change amount is set to 25 degrees, and the frequency change rate threshold is set to 50.
The application also discloses an island detection device of the direct-current interconnected power distribution system, the direct-current interconnected power distribution system comprises a main network power supply, a load power grid, a connecting transformer, a converter station and a plurality of alternating-current systems, the main network power supply supplies power to the load power grid, the plurality of alternating-current systems are connected with a primary winding of the connecting transformer through the converter station, and a secondary winding of the connecting transformer is connected with the load power grid;
a first embodiment of the islanding detection apparatus comprises:
the initialization module is used for setting sampling frequency, maximum phase variation, minimum phase variation and a frequency variation rate threshold;
the acquisition module is used for detecting the voltage parameters of the connecting transformer and analyzing the phase and the frequency of the voltage parameters;
the first calculation module is used for calculating the difference value between the phase of the voltage parameter at the current moment and the phase of the voltage parameter at the previous moment, and defining the difference value as a real-time phase variation;
the first comparison module is used for comparing the real-time phase variation with the maximum phase variation;
the second comparison module is used for comparing the real-time phase variation with the maximum phase variation;
the second calculation module is used for calculating the frequency change rate of the voltage parameter at the current moment and recording the frequency change rate as a real-time frequency change rate;
the third comparison module is used for comparing the real-time frequency change rate with the frequency change rate threshold value;
and the control module is used for controlling the direct-current interconnected power distribution system to be switched into an island operation mode when the real-time phase variation is greater than the maximum phase variation, or when the real-time phase variation is smaller than the maximum phase variation, the real-time phase variation is greater than the minimum phase variation, and the real-time frequency variation rate is greater than the frequency variation rate threshold value, so that the direct-current interconnected power distribution system is controlled to be switched into the island operation mode.
Further as a preferred implementation manner, in this embodiment, the present technical solution further includes a third calculating module, where the third calculating module is configured to calculate a duration in the state when the real-time frequency change rate is greater than the frequency change rate threshold;
the initialization module is further used for setting a time threshold;
the control module is configured to control the dc interconnected power distribution system to switch to an island operation mode when the real-time phase variation is smaller than the maximum phase variation, the real-time phase variation is larger than the minimum phase variation, the real-time frequency variation is larger than the frequency variation threshold, and the duration is larger than the time threshold.
Further preferably, in this embodiment, the sampling frequency is set to 1000 times per second, the time threshold is set to 40 milliseconds, the maximum phase change amount is set to 50 degrees, the minimum phase change amount is set to 25 degrees, and the frequency change rate threshold is set to 50.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (6)
1. An island detection method of a direct current interconnection power distribution system is characterized in that: the direct-current interconnection power distribution system comprises a main network power supply, a load power grid, a connecting transformer and a plurality of alternating-current systems, wherein the main network power supply supplies power to the load power grid, the alternating-current systems are all connected with a primary winding of the connecting transformer, a secondary winding of the connecting transformer is connected with the load power grid, and the island detection method comprises the following steps:
step 100, setting a sampling frequency, a maximum phase variation, a minimum phase variation and a frequency variation rate threshold;
200, detecting voltage parameters of the connecting transformer, and analyzing the phase and frequency of the voltage parameters;
step 300, calculating a difference value between the phase of the voltage parameter at the current moment and the phase of the voltage parameter at the previous moment, and defining the difference value as a real-time phase variation;
step 400, comparing the real-time phase variation with the maximum phase variation, if the real-time phase variation is larger than the maximum phase variation, proving that the direct-current interconnected power distribution system generates an island phenomenon, and controlling the direct-current interconnected power distribution system to be switched into an island operation mode, otherwise, continuing to execute the operation downwards;
step 500, comparing the real-time phase variation with the minimum phase variation, and if the real-time phase variation is greater than the minimum phase variation, calculating a frequency variation rate of the voltage parameter at the current moment, and recording the frequency variation rate as a real-time frequency variation rate;
step 600, comparing the real-time frequency change rate with the frequency change rate threshold, if the real-time frequency change rate is greater than the frequency change rate threshold, proving that the direct-current interconnected power distribution system generates an island phenomenon, and controlling the direct-current interconnected power distribution system to switch to an island operation mode.
2. The islanding detection method for the direct-current interconnected power distribution system according to claim 1, characterized in that: step 100 further includes setting a time threshold, and step 600 further includes calculating a duration time in the state if the real-time frequency change rate is greater than the frequency change rate threshold, comparing the duration time with the time threshold, and if the duration time is greater than the time threshold, proving that the dc interconnected power distribution system generates an islanding phenomenon, and controlling the dc interconnected power distribution system to switch to an islanding operation mode.
3. The islanding detection method for the direct-current interconnected power distribution system according to claim 2, characterized in that: the sampling frequency is set to 1000 times per second, the time threshold is set to 40 milliseconds, the maximum phase change amount is set to 50 degrees, the minimum phase change amount is set to 25 degrees, and the frequency change rate threshold is set at 50.
4. The utility model provides a direct current interconnected distribution system's island detection device which characterized in that: the direct current interconnection power distribution system comprises a main network power supply, a load power grid, a connecting transformer and a plurality of alternating current systems, wherein the main network power supply supplies power to the load power grid, the alternating current systems are all connected with a primary winding of the connecting transformer, a secondary winding of the connecting transformer is connected with the load power grid, and the island detection device comprises:
the initialization module is used for setting sampling frequency, maximum phase variation, minimum phase variation and a frequency variation rate threshold;
the acquisition module is used for detecting the voltage parameters of the connecting transformer and analyzing the phase and the frequency of the voltage parameters;
the first calculation module is used for calculating the difference value between the phase of the voltage parameter at the current moment and the phase of the voltage parameter at the previous moment, and defining the difference value as a real-time phase variation;
the first comparison module is used for comparing the real-time phase variation with the maximum phase variation;
the second comparison module is used for comparing the real-time phase variation with the maximum phase variation;
the second calculation module is used for calculating the frequency change rate of the voltage parameter at the current moment and recording the frequency change rate as a real-time frequency change rate;
the third comparison module is used for comparing the real-time frequency change rate with the frequency change rate threshold value;
and the control module is used for controlling the direct-current interconnected power distribution system to be switched into an island operation mode when the real-time phase variation is greater than the maximum phase variation, or when the real-time phase variation is smaller than the maximum phase variation, the real-time phase variation is greater than the minimum phase variation, and the real-time frequency variation rate is greater than the frequency variation rate threshold value, so that the direct-current interconnected power distribution system is controlled to be switched into the island operation mode.
5. The islanding detection device of the direct-current interconnected power distribution system according to claim 4, wherein: the islanding detection device further comprises a third calculation module, wherein the third calculation module is used for calculating the duration time in the state when the real-time frequency change rate is larger than the frequency change rate threshold value;
the initialization module is further used for setting a time threshold;
the control module is configured to control the dc interconnected power distribution system to switch to an island operation mode when the real-time phase variation is smaller than the maximum phase variation, the real-time phase variation is larger than the minimum phase variation, the real-time frequency variation is larger than the frequency variation threshold, and the duration is larger than the time threshold.
6. The islanding detection device of the direct-current interconnected power distribution system according to claim 5, wherein: the sampling frequency is set to 1000 times per second, the time threshold is set to 40 milliseconds, the maximum phase change amount is set to 50 degrees, the minimum phase change amount is set to 25 degrees, and the frequency change rate threshold is set at 50.
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| CN117805541A (en) * | 2024-02-29 | 2024-04-02 | 西安千帆翼数字能源技术有限公司 | Island detection method, protection method and related device of energy storage converter |
| CN117805541B (en) * | 2024-02-29 | 2024-05-03 | 西安千帆翼数字能源技术有限公司 | Island detection method, protection method and related device of energy storage converter |
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