Power control cabinet capable of adaptively adjusting voltage

Abstract

The invention discloses a power control cabinet capable of adaptively adjusting voltage, and relates to the technical field of power equipment, and the power control cabinet comprises a voltage monitoring module which is used for collecting voltage data of a power distribution area in real time; the control processing module is electrically connected with the voltage monitoring module and is used for judging that the voltage is in different grade states and outputting a reactive power regulation instruction according to a set strategy; the reactive power adjusting module is used for dynamically adjusting reactive power according to the instruction of the control processing module; and the communication module is used for carrying out data interaction with the photovoltaic inverter to realize cooperative control of reactive power regulation. According to the power control cabinet capable of adaptively adjusting the voltage, the state of the current power grid voltage can be intelligently judged by analyzing and processing the voltage signal acquired by the voltage monitoring module, and corresponding reactive power adjustment is performed according to a preset control strategy, so that the voltage of a distribution network is effectively controlled and managed.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly to a power control cabinet with voltage self - adaptive regulation. Background Art

[0002] With the rapid development of distributed power sources, a large number of new energy sources are connected to the distribution network, bringing new challenges to the safe and stable operation of the distribution network. After the new energy is connected to the distribution network, due to the intermittent, random and fluctuating characteristics of new energy power generation, the distribution of power flow in the distribution network is uneven, the voltage quality deteriorates, and thus the power consumption experience of users is affected.

[0003] Currently, the commonly used solution is to improve the power factor of the distribution network through low - voltage reactive power compensation devices, reduce line losses, and improve voltage quality. However, the existing low - voltage reactive power compensation devices usually can only passively follow the change of the grid voltage to perform reactive power compensation, cannot actively adapt to the needs of the grid, and lack unified control standards and specifications, so there are certain limitations in practical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a power control cabinet with voltage self - adaptive regulation to solve the problems raised in the above - mentioned background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A power control cabinet with voltage self - adaptive regulation, comprising: A voltage monitoring module for real - time collecting voltage data of the distribution sub - station area; A control processing module electrically connected to the voltage monitoring module, for judging the voltage in different grade states and outputting a reactive power regulation instruction according to a set strategy; A reactive power regulation module for dynamically adjusting the reactive power according to the instruction of the control processing module; A communication module for data interaction with the photovoltaic inverter to achieve coordinated control of reactive power regulation; A protection control module for starting a protection mechanism in case of over - voltage, under - voltage, overload abnormal conditions to cut off or limit the reactive power compensation output; wherein, the control processing module is built - in with multi - level voltage judgment, voltage change trend recognition and hysteresis switching algorithms, and is provided with configurable regulation dead zones and safety limits.

[0006] In one embodiment, the voltage judgment divides the input voltage into at least five grades, including severe over - voltage, mild over - voltage, normal, mild under - voltage and severe under - voltage, and each grade is provided with a corresponding reactive power regulation strategy.

[0007] In one embodiment, the control processing module is configured with a delay control mechanism to ensure that the regulation action is executed only after the abnormal voltage state lasts for a set time to avoid frequent switching.

[0008] In one embodiment, the communication module communicates with the photovoltaic inverter based on protocols such as 485, Modbus or others, to achieve responsive reactive power regulation of the photovoltaic system to the grid voltage.

[0009] In one embodiment, the protection control module includes upper and lower voltage limit judgment, protection counting mechanism and fault tolerance processing flow, and automatically enters the protection state according to continuous abnormal voltage.

[0010] In one embodiment, the control processing module is further configured with a power factor calculation unit, which dynamically calculates the current power factor according to the sampled current and voltage data, and performs optimization control.

[0011] In one embodiment, the power control cabinet adopts a modular structure design, and the functional modules include a voltage regulation module, a photovoltaic regulation module, and a communication coordination module.

[0012] In one embodiment, multiple said power control cabinets form a regional coordination network through the communication module, to achieve the linkage control of multi-point reactive power resources and the coordinated voltage regulation within the substation area.

[0013] In one embodiment, the power control cabinet further includes a display module, which is used to display key index parameters such as the current power factor, harmonic content, and the current operation mode information.

[0014] The present invention provides a power control cabinet with voltage adaptive regulation, having the following beneficial effects: By analyzing and processing the voltage signal obtained by the voltage monitoring module, the present invention can intelligently judge the current state of the grid voltage, and perform corresponding reactive power regulation according to the preset control strategy, so as to achieve the effective control and management of the distribution network voltage. At the same time, the power control cabinet also integrates multiple functional modules, such as a communication module, a protection control module, etc., which can better meet various requirements in practical application scenarios. Specific Embodiments

[0015] The following further describes in detail the embodiments of the present invention in conjunction with the embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0016] A power control cabinet with voltage adaptive regulation, comprising: A voltage monitoring module, which is used to collect voltage data of the distribution substation area in real time; A control processing module, electrically connected to the voltage monitoring module, which is used to judge the voltage in different grade states and output reactive power regulation instructions according to the set strategy; A reactive power regulation module, which is used to dynamically adjust the reactive power according to the instructions of the control processing module; Communication module, used to exchange data with the photovoltaic inverter to achieve coordinated control of reactive power regulation; The protection control module is used to activate the protection mechanism in abnormal conditions such as overvoltage, undervoltage, overload, etc., and cut off or limit the reactive power compensation output; Among them, the control processing module has built-in multi-level voltage judgment, voltage change trend identification and hysteresis switching algorithm, and is equipped with configurable adjustment dead zone and safety limit.

[0017] The power control cabinet can intelligently determine the current state of the grid voltage by analyzing and processing the voltage signal obtained by the voltage monitoring module, and perform corresponding reactive power adjustment according to the preset control strategy, thereby realizing effective control and management of the distribution network voltage. At the same time, the power control cabinet also integrates a variety of functional modules, such as communication modules, protection control modules, etc., which can better meet various needs in actual application scenarios.

[0018] In one embodiment, the voltage judgment divides the input voltage into at least five levels, including severe overvoltage, mild overvoltage, normal, mild undervoltage and severe undervoltage. Each level is equipped with a corresponding reactive power regulation strategy, so that appropriate measures can be taken according to different voltage conditions to ensure the reliability and stability of the system.

[0019] In one embodiment, the control processing module is configured with a delay control mechanism to ensure that the adjustment action is not performed until the abnormal voltage state continues for a set time to avoid frequent switching. This setting can effectively reduce the number of unnecessary adjustments, save energy consumption and extend the life of the equipment.

[0020] In one embodiment, the communication module communicates with the photovoltaic inverter based on 485, Modbus or other protocols to achieve responsive reactive power regulation of the photovoltaic system to the grid voltage. In this way, two-way interaction can be achieved through communication with the photovoltaic inverter, and the output of reactive power can be controlled more flexibly and efficiently.

[0021] In one embodiment, the protection control module includes voltage upper and lower limit judgment, protection counting mechanism and fault-tolerant processing flow, and can automatically enter the protection state according to continuous abnormal voltage, so that the protection mechanism can be triggered in time in the event of a fault to prevent the system from being damaged.

[0022] In one embodiment, the control processing module is further configured with a power factor calculation unit, which can dynamically calculate the current power factor based on the current and voltage sampling data and perform optimization control. This can more accurately evaluate the performance of the system and make corresponding adjustments for different load conditions, thereby improving the overall efficiency.

[0023] In one embodiment, the power control cabinet adopts a modular structure design. The various functional modules can be combined and expanded according to application requirements, including a voltage regulation module, a photovoltaic regulation module, a communication coordination module, etc. In this way, appropriate modules can be selected for assembly according to the actual situation, making the entire system more flexible and customizable.

[0024] In one embodiment, multiple power control cabinets can form a regional coordination network through communication modules to achieve the linkage control of reactive power resources at multiple points in the substation area and the coordinated regulation of voltage. In this way, all the power control cabinets in the region can be networked to enable them to cooperate together to complete the reactive power regulation task, enhancing the overall functionality and reliability.

[0025] In one embodiment, the power control cabinet further includes a display module for displaying key index parameters such as the current power factor and harmonic content, as well as the current operating mode information. This can help users intuitively understand the state of the system for better management and maintenance.

[0026] In one embodiment, the power control cabinet further includes a human-machine interaction module for receiving user operation commands and displaying relevant feedback information. This can facilitate users to perform remote control and monitoring, enhancing the user experience.

[0027] Specifically, Chenzhuang South Substation is a public transformer under the jurisdiction of xx Power Supply Station, with a distribution transformer capacity of 400 kVA and 1 distribution cabinet. It has 2 low-voltage branches, the south line and the north line. Among them, the north line has a heavier load, and the power supply network is radial. The load in this substation area is mainly for residents, aquaculture, and agricultural irrigation. The early peak of electricity consumption is from 6 to 8 o'clock, and the late peak is from 17 to 19 o'clock, and low voltage is likely to occur. This substation area is a photovoltaic substation area with a photovoltaic penetration rate of 87.695%. The photovoltaic power generation period is from 8 to 17 o'clock, and high voltage problems are likely to occur. The tap position of the substation transformer is set at the 4th gear. Although the appearance of low-voltage users is avoided, it is easy to cause the voltage to exceed the upper limit. In the voltage panoramic monitoring, the qualified index of the distribution transformer gateway in this substation area is only 4.211, and the index exceeding the upper limit is as high as 95.79.

[0028] Two power control cabinets are respectively installed live on the 8th pole of the north line and the 10-7# pole of the north line. The power control cabinet effectively solves the problem of coexistence of high and low voltages in the photovoltaic substation area. After treatment, the voltage index has been significantly improved. The voltage at the head end of the substation area is stabilized between 200V and 234V. The qualified index of the distribution transformer gateway has increased by 95.789 percentage points compared with that before treatment, reaching 100%, and the index exceeding the upper limit has dropped from 95.79 to 0.

[0029] The embodiments of the present invention are given by way of example and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the present invention and its practical application, and to enable those of ordinary skill in the art to understand the present invention so as to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A power control cabinet with voltage self - adaptive regulation, characterized in that, Including: A voltage monitoring module for collecting voltage data of a distribution substation area in real time; A control processing module electrically connected to the voltage monitoring module, for judging the voltage at different level states and outputting a reactive power regulation instruction according to a set strategy; A reactive power regulation module for dynamically adjusting the reactive power according to the instruction of the control processing module; A communication module for data interaction with a photovoltaic inverter to achieve cooperative control of reactive power regulation; A protection control module for starting a protection mechanism in case of overvoltage, undervoltage, overload abnormalities to cut off or limit the reactive power compensation output; wherein, the control processing module is built-in with multi-level voltage judgment, voltage change trend recognition and hysteresis switching algorithms, and is provided with a configurable regulation dead zone and safety limit.

2. The power control cabinet with voltage self - adaptive regulation according to claim 1, characterized in that, The voltage judgment divides the input voltage into at least five levels, including severe overvoltage, light overvoltage, normal, light undervoltage and severe undervoltage, and each level is provided with a corresponding reactive power regulation strategy.

3. The power control cabinet with voltage self - adaptive regulation according to claim 2, characterized in that, The control processing module is configured with a delay control mechanism to ensure that the regulation action is executed only after the abnormal voltage state lasts for a set time to avoid frequent switching.

4. A power control cabinet with voltage self - adaptive regulation according to claim 3, characterized in that, The communication module communicates with the photovoltaic inverter based on protocols such as 485, Modbus or others to achieve responsive reactive power regulation of the photovoltaic system to the grid voltage.

5. A power control cabinet with voltage self - adaptive regulation according to claim 4, characterized in that, The protection control module includes voltage upper and lower limit judgment, a protection counting mechanism and a fault tolerance processing flow, and automatically enters the protection state according to continuous abnormal voltages.

6. A power control cabinet with voltage self - adaptive regulation according to claim 5, characterized in that, The control processing module is further configured with a power factor calculation unit to dynamically calculate the current power factor according to the sampled current and voltage data and perform optimization control.

7. A power control cabinet with voltage self - adaptive regulation according to claim 6, characterized in that, The power control cabinet adopts a modular structure design, and the functional modules include a voltage regulation module, a photovoltaic regulation module, and a communication coordination module.

8. A power control cabinet with voltage self - adaptive regulation according to claim 7, characterized in that, Multiple power control cabinets form a regional coordination network through the communication module to achieve linkage control of multi-point reactive power resources and voltage cooperative regulation in the substation area.

9. The power control cabinet with voltage self - adaptive regulation according to claim 8, characterized in that, The power control cabinet further includes a display module for displaying key index parameters such as the current power factor and harmonic content and the current operation mode information.