Electromagnetic power distribution area voltage treatment method and system

Abstract

The invention discloses a voltage treatment method and system for an electromagnetic power distribution area, and the method comprises the steps: automatically detecting the three-phase voltage of the power distribution area, automatically calculating a split-phase adjustment strategy of the three-phase voltage of the power distribution area, and achieving the topological design of a circuit according to the calculated voltage adjustment strategy. The three-phase line performs targeted voltage regulation according to the change of respective load, and the split-phase voltage regulation on-load voltage regulation switch comprises a switch driving mechanism and a control circuit; the system comprises a research system for voltage detection and adjustment of a power distribution area, a novel voltage reactive comprehensive control system suitable for a power distribution area system, an electromagnetic power distribution area health online detection system and an experiment platform construction and experiment research system. The method is suitable for voltage reactive power novel comprehensive control strategy research of a power distribution system, and voltage treatment of a power distribution area is realized; stable operation of a power grid is ensured, the utilization rate of electric energy is improved, and appropriate voltage supply is provided for various electrical equipment.

Description

Technical Field

[0001] The present invention relates to a method for managing a distribution station area, and in particular to a method and system for managing voltage in an electromagnetic distribution station area. Background Art

[0002] The voltage at the end of the distribution network exceeds the limit, which is a common phenomenon. The treatment of unqualified distribution network voltage is one of the key points of the daily work of power grid personnel. At present, the more reasonable measures are to notify users to make internal rectifications, switch capacitor banks, and apply no-excitation voltage regulation and mechanical on-load voltage regulation transformers. There are a large number of single-phase loads in the urban suburbs and rural distribution networks, which leads to serious three-phase voltage and current imbalance in the distribution area. In addition, random and wrong connections often occur in urban suburbs and rural power grids. Therefore, the user rectification method will not have a radical effect of "curing the disease with medicine".

[0003] On the other hand, switching capacitors when reactive power is sufficient will result in excess reactive power or even waste. Transformer voltage regulation in distribution substations is a major measure for voltage control in power systems. Under the evaluation indicators of parameters such as user complaint rate and average power outage time and the development trend of intelligent and automated power grids, off-excitation voltage regulation will gradually become a transitional switching method. The on-load tap changer configuration rate in developed countries is much higher than that in my country. The coverage rate of on-load voltage regulation for transformers above 6.6kV in Germany has reached more than 90%. Mechanical tap changers have slow response speed, complex device structure, and huge size. Moreover, over time, arcs will cause a series of mechanical failures. The electromagnetic distribution substation voltage management solution with three-phase controllable, three-phase independent regulation, and transformer signal acquisition, judgment, and control is particularly important.

[0004] The core of electromagnetic substation voltage management is to adjust the transformer ratio through transformer voltage regulation technology or use a voltage regulator. When adjusting the transformer ratio, the phase voltage can be changed by changing the neutral point position of the transformer. When the grid voltage needs to be increased, the neutral point position is moved to a low potential; when the grid voltage needs to be reduced, the neutral point position is moved to a high potential. Another common method is to use a voltage regulator, which can adjust the voltage by automatically controlling the connection or disconnection of the power supply. The voltage regulator is usually composed of electronic devices or relays. According to the input of the control signal, the voltage regulator can adjust the corresponding relay state to achieve the purpose of changing the grid voltage.

[0005] At present, many suburban and rural distribution networks still have problems with poor voltage stability or unqualified voltage. At the same time, there are a large number of single-phase loads in suburban and rural distribution networks. The uneven distribution of single-phase loads leads to unbalanced three-phase loads in the distribution network, which makes the three-phase voltage output of the transformer unbalanced. The existing distribution transformer voltage regulation method is three-phase simultaneous voltage regulation, so the problem of three-phase voltage imbalance cannot be solved, and it may also adjust the voltage of a certain phase that was originally qualified to unqualified. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to provide a method and system for voltage control in an electromagnetic distribution station area, based on the research of on-load distribution transformer voltage regulation system and main circuit driven by a new electric mechanism, and the research of a new integrated voltage and reactive power control strategy suitable for the distribution system, so as to achieve voltage control in the distribution station area.

[0007] Technical solution: The electromagnetic distribution station area voltage management method described in the present invention includes automatically detecting the three-phase voltage in the distribution station area, automatically calculating the strategy for phase-by-phase regulation of the three-phase voltage in the distribution station area, and realizing the circuit topology design according to the calculated voltage regulation strategy. The three-phase lines perform targeted voltage regulation according to changes in their respective loads, and the phase-by-phase voltage-regulating on-load voltage-regulating switch includes a switch drive mechanism and a control circuit.

[0008] Furthermore, the topological design of the distribution station area circuit includes the research and design of the control strategy of the phase-splitting driving circuit of the three-phase regulating mechanism.

[0009] Furthermore, the switch driving mechanism is divided into two parts: tapping gear selection and controllable conversion. The driving element used for tapping gear selection is a fast transmission component with a self-locking function, and the driving source adopts a closed stepping motor.

[0010] The electromagnetic distribution substation voltage management system described in the present invention includes a distribution substation voltage detection and regulation research system, a new voltage and reactive power integrated control system suitable for the distribution substation system, an electromagnetic distribution substation health online detection system, and an experimental platform construction and experimental research system.

[0011] Furthermore, the research system for detecting and regulating the distribution station area voltage includes automatic detection of the distribution station area three-phase voltage, the strategy for phase-by-phase regulation of the three-phase voltage in the distribution station area, the topological design of the drive circuit, the overall system structure, and the control strategy research and design of the phase-by-phase drive circuit of the three-phase regulation mechanism in the distribution station area.

[0012] Furthermore, the new integrated voltage-reactive power control system suitable for the distribution station area system is a control strategy study combining reactive power regulation of low-voltage distribution transformers with on-load voltage regulation, that is, a control strategy combining phase-splitting voltage regulation with phase-splitting reactive power compensation.

[0013] Furthermore, the electromagnetic distribution station area health online detection system is a system for electromagnetic distribution station area health status detection system research, sensor installation strategy research system, health detection data collection, processing and analysis, data upload and storage system design, and early warning of the overall distribution station area health status.

[0014] Furthermore, the experimental platform construction and experimental research system utilizes the DS1103 PPC ControllerBoard board to build a semi-physical simulation platform. For example, the DS1103 board has 20 main ADC channels, 8 main DAC channels, 50 main I / O interfaces, and has RS232 and CAN communication interfaces.

[0015] Furthermore, when the processor executes the program, the electromagnetic distribution station area voltage management method is implemented.

[0016] Furthermore, the computer program is designed to implement the electromagnetic distribution station area voltage management method when running.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the on-load distribution transformer voltage regulation system and main circuit research based on the new electric mechanism drive proposed in the present invention, the research on the new comprehensive control strategy for voltage and reactive power suitable for the distribution system, realizes the voltage control of the distribution station area; ensures the stable operation of the power grid, improves the utilization rate of electric energy, and provides suitable voltage supply for various electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0020] The present invention automatically detects the three-phase voltage in the distribution station area, automatically calculates the strategy for phase-by-phase regulation of the three-phase voltage in the distribution station area, and implements the topological design of the circuit according to the voltage regulation strategy obtained by calculation. The top priority in the topological design of the distribution area circuit is the control strategy research and design of the phase-splitting drive circuit of the three-phase regulation mechanism. The timing of the switching trigger is random during the switching process, and the problem of overvoltage cutoff occurs from time to time. In fact, there are still many problems and difficulties in the thyristor on-load tap changer, such as the high price far higher than the cost of the main transformer, the large size is almost the size of the main transformer, and the sensitive interference of the electric control system cannot immediately compete with existing products. Most of the dry on-load switches on the market are also relatively large in size, and their switching mechanisms are quite complex and almost controllable. Moreover, under the premise of the increasing development of intelligent and refined distribution networks, the development has been hindered to a certain extent due to the lack of real-time technology updates. In addition, in the process of voltage regulation, only three phases can be regulated simultaneously, and the imbalance problem caused by the single-phase power consumption of most distribution networks is almost impossible to solve. Based on the above problems, the three-phase tap changer in the distribution area is separated for each phase and operated independently of each other. Therefore, in addition to maintaining the stability of each phase voltage, the system can also compensate for the imbalance between the phases. And it is controllable during the voltage regulation process. By utilizing the control system's zero-crossing acquisition system, the switching process can be made infinitely close to the zero point, reducing the fluctuation of the switching process on the grid voltage and current.

[0021] The switching unit adopts a fast direct-acting motor, which is predicted by the control system to drive the switching vacuum device to open and close, and achieve three-phase separate regulation, such as Figure 1 shown.

[0022] Research on the detection and regulation of distribution substation voltage: automatic detection of distribution substation three-phase voltage, strategy for phase-by-phase regulation of distribution substation three-phase voltage, topological design of drive circuit, and overall system structure research. Research and design of control strategy for phase-by-phase drive circuit of three-phase regulation mechanism in distribution substation.

[0023] Research on a new integrated voltage and reactive power control strategy suitable for distribution substation area systems: Research on a control strategy combining reactive power regulation of low-voltage distribution transformers with on-load voltage regulation, that is, a control strategy combining phase-by-phase voltage regulation with phase-by-phase reactive power compensation.

[0024] The main research content of the voltage management of electromagnetic distribution station area is to carry out targeted voltage regulation of three-phase lines according to the changes of their respective loads. The phase-splitting voltage-regulating on-load voltage-regulating switches are divided into new drive mechanisms and control circuits.

[0025] The switch drive is divided into two parts: tap gear selection and controllable conversion. The driving element used for the tap gear selection is a fast transmission component with a self-locking function. The driving source is a closed stepper motor. Its advantage is that it has a wider range of use than traditional motors, that is, it can operate well under low voltage conditions. The minimum operating voltage can reach 110V, which can fully meet the requirements of low voltage management of the power grid. At present, most of the motors used for on-load switches in distribution networks are three-phase asynchronous motors, and the normal use range is 220±10%. However, most of the problems we solve are low voltage adjustment problems, which is inconsistent with the application scenario. In addition, all transmission mechanisms on the market are open structures, and they are huge in size and occupy a large space in the equipment, which leads to a short service life and requires periodic maintenance. Using stepper motors as power sources can overcome the above problems and greatly reduce the manufacturing volume of the equipment, thereby reducing the volume of the overall device. The rotation angle of the stepper motor is controllable, and it can accurately reach the predetermined gear position with the positioning transmission mechanism, and the accuracy of repeated actions is high.

[0026] Infrared sensors are added to detect whether there is arcing during the gear switching process of the on-load tap changer. The on-load tap changer using vacuum arc extinguishing technology cannot have arcing during the gear switching process.

[0027] Electromagnetic distribution substation health online detection system: System research on electromagnetic distribution substation health status detection, sensor installation strategy research. Health detection data collection, processing and analysis. Data upload and storage system design, early warning of the overall distribution substation health status.

[0028] Experimental platform construction and experimental research: Build an experimental model to verify the feasibility of phase voltage regulation in electromagnetic distribution substations. Build an electromagnetic distribution substation status detection experimental platform.

[0029] Semi-physical approach

[0030] In the early development of electrical equipment, the hardware and software parts must be completed at the same time before the equipment can be debugged and tested. This process has the problems of long cycle and low efficiency. With the development of simulation technology, before hardware development, the software control strategy can be verified and regulated separately in the actual environment, so as to find problems and modify the control program in time. This process is called rapid control prototype semi-physical simulation; similar to this process, when the control program and control circuit are completed, in order to verify the correctness of the function, it is not necessary to connect the actual device, but to connect with the virtual device through the interface to form a loop test system of the prototype controller and the virtual power device, which is called hardware in the loop (HIL) semi-physical simulation; there is also a simulation system that uses actual control circuits and power devices, such as inverter units, to establish a simulation system through a virtual simulation platform controller through amplification devices such as power amplifiers and actual peripherals. Because the power amplifier device is added, the simulation loop is called power hardware in the loop simulation semi-physical.

[0031] Platform construction

[0032] Using the DS1103 PPC Controller Board, a semi-physical simulation platform is built. The DS1103 board has 20 main ADC channels, 8 main DAC channels, 50 main I / O interfaces, and has RS232, CAN and other communication interfaces. The dSPACE system is used as a control loop to collect the analog current and voltage of the power loop through the peripheral interface, control the switch and the on and off of the power electronic devices, and realize the switching process. The platform equipment parameters are: dry-type transformer, high-voltage oscilloscope, high-voltage probe, load (or equal power transformer), TDGC2J, Agilent DSO7104A, Chint F4-22, MTC100-10.

[0033] Development of health detection and analysis software for electromagnetic distribution substations: Based on the analysis of large-scale collected electromagnetic distribution substation data, the software predicts the service life and fault warning of each equipment in the electromagnetic distribution substation.

[0034] The electromagnetic distribution substation health detection and analysis software mainly realizes the classification, storage and backup of substation information uploaded to the data center. Through the analysis of a large number of substations and long-term operation data, the occurrence of substation failures can be predicted, and the life of the materials used in the electromagnetic distribution substation equipment can be detected. The software can also adjust the parameters of the remote substation and the output voltage of the entire substation line.

Claims

1. A method for voltage management in an electromagnetic distribution station area, characterized in that: It includes automatically detecting the three-phase voltage in the distribution station area, automatically calculating the strategy for phase-by-phase regulation of the three-phase voltage in the distribution station area, and realizing the circuit topology design according to the calculated voltage regulation strategy. The three-phase lines perform targeted voltage regulation according to changes in their respective loads. The phase-by-phase voltage-regulating on-load voltage-regulating switch includes a switch drive mechanism and a control circuit.

2. The method for controlling voltage in an electromagnetic distribution station area according to claim 1, characterized in that: The topological design of the distribution station area circuit includes the research and design of the control strategy of the phase-splitting driving circuit of the three-phase regulating mechanism.

3. The method for controlling voltage in an electromagnetic distribution station area according to claim 1, characterized in that: The switch driving mechanism is divided into two parts: tapping gear selection and controllable conversion. The driving element used in the tapping gear selection is a fast transmission component with a self-locking function, and the driving source adopts a closed stepping motor.

4. An electromagnetic distribution station area voltage management system, characterized in that: It includes a research system for detecting and regulating the voltage in distribution substations, a new integrated voltage and reactive power control system suitable for distribution substation systems, an electromagnetic distribution substation health online detection system, and an experimental platform construction and experimental research system.

5. The electromagnetic distribution station area voltage management system according to claim 4 is characterized in that: The research system for detecting and regulating the distribution station area voltage includes automatic detection of the distribution station area three-phase voltage, the strategy for phase-by-phase regulation of the distribution station area three-phase voltage, the topological design of the drive circuit, the overall system structure, and the control strategy research and design of the phase-by-phase drive circuit of the three-phase regulation mechanism of the distribution station area.

6. The electromagnetic distribution station area voltage management system according to claim 4 is characterized in that: The new integrated voltage-reactive power control system suitable for the distribution substation area system is a control strategy study combining reactive power regulation of low-voltage distribution transformers with on-load voltage regulation, that is, a control strategy combining phase-splitting voltage regulation with phase-splitting reactive power compensation.

7. The electromagnetic distribution station area voltage management system according to claim 4 is characterized in that: The electromagnetic distribution substation health online detection system is a system for electromagnetic distribution substation health status detection, sensor installation strategy research, health detection data collection, processing and analysis, data upload and storage system design, and early warning of the overall distribution substation health status.

8. The electromagnetic distribution station area voltage management system according to claim 4 is characterized in that: The experimental platform construction and experimental research system utilizes the DS1103 PPC Controller Board to build a semi-physical simulation platform. For example, the DS1103 board has 20 main ADC channels, 8 main DAC channels, 50 main I / O interfaces, and has RS232 and CAN communication interfaces.

9. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the electromagnetic distribution station area voltage management method according to any one of claims 1-3 is implemented.

10. A storage medium storing a computer program, characterized in that: The computer program is designed to implement the method for voltage management in an electromagnetic distribution station area according to any one of claims 1 to 3 when running.

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