High-voltage SVG dynamic compensation device

Abstract

The invention relates to the technical field of dynamic reactive compensation. More specifically, the invention relates to a high-voltage SVG dynamic compensation device. In the high-voltage SVG dynamic compensation device, a long-transmission high-voltage wire generates certain reactive power, a first parameter acquisition unit is arranged to detect a current mutual inductance parameter or a voltage mutual inductance parameter of a transformer and send the current mutual inductance parameter or the voltage mutual inductance parameter to an SVG compensation module, and reactive compensation of a power transmission line is achieved; and meanwhile, the SVG compensation module and the capacitance compensation module are comprehensively used, so that the capacity requirement of the system on the SVG compensation module is reduced on the premise of ensuring the reactive compensation effect of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic reactive power compensation, and more specifically, to a high-voltage SVG dynamic compensation device. Background Art

[0002] The stable operation of the power system is one of the foundations of modern social and economic development. With the continuous growth of industrial production and residential electricity demand, it is particularly important to ensure the efficient, reliable and safe operation of the power grid. As an important electrical equipment, high-voltage SVG (static var generator) plays a key role in improving the stability of the power system and improving the quality of power. By dynamically compensating for reactive power, high-voltage SVG can effectively reduce line losses, improve transmission efficiency, and enhance the system's anti-interference ability, thereby improving the performance of the entire power network.

[0003] In order to achieve effective management of high-voltage power grids, various means are usually used in the prior art to monitor and adjust grid parameters. Common methods include the combination of traditional SVC (static VAR compensator) and modern SVG. Among them, SVC mainly performs reactive power compensation by adjusting fixed capacitor banks or thyristor switching capacitor banks; while SVG uses high-power inverters to generate the required reactive current to track load changes in real time and respond quickly to system needs. In addition, various types of sensors such as current transformers and voltage transformers are used to collect grid parameters so that the main control unit can perform data analysis and issue control instructions.

[0004] However, the existing high-voltage SVG dynamic compensation device still has some shortcomings in practical application. For example, although the accuracy of the system can be improved by collecting data at multiple points, under complex working conditions, the data at different locations may vary greatly, resulting in inaccurate control strategies and affecting the compensation effect. At the same time, a single compensation method is difficult to cope with diverse working environments, especially under high load fluctuations, which is prone to untimely compensation or over-compensation, thereby affecting the safety and stability of the power grid. Therefore, how to design a more flexible and efficient high-voltage SVG dynamic compensation device has become an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical problems and provide a high-voltage SVG dynamic compensation device and system.

[0006] In order to achieve these purposes and other advantages according to the present invention, a high voltage SVG dynamic compensation device is provided, comprising:

[0007] Main control unit;

[0008] An SVG compensation module, which is electrically connected to the main control unit;

[0009] A capacitance compensation module, which is electrically connected to the main control unit;

[0010] A first parameter acquisition unit, which is electrically connected to the main control unit;

[0011] The second parameter acquisition unit is electrically connected to the main control unit.

[0012] Furthermore, in the high-voltage SVG dynamic compensation device, the first parameter acquisition unit includes a current transformer.

[0013] Furthermore, in the high-voltage SVG dynamic compensation device, the first parameter acquisition unit includes a voltage transformer.

[0014] Furthermore, in the high-voltage SVG dynamic compensation device, the second parameter acquisition unit includes a three-phase current acquisition module, a three-phase voltage acquisition module and a load current acquisition module.

[0015] Furthermore, in the high-voltage SVG dynamic compensation device, the SVG compensation module is a 50kvarSVG compensation module.

[0016] Furthermore, in the high-voltage SVG dynamic compensation device, the capacitor compensation module is a 50kvarSVC compensation module.

[0017] Furthermore, in the high-voltage SVG dynamic compensation device, the main control unit includes:

[0018] A control module, which is electrically connected to the first parameter acquisition unit and the second parameter acquisition unit;

[0019] A control driving circuit is electrically connected to the control module, and the SVG compensation module and the capacitance compensation module are electrically connected to the control driving circuit respectively.

[0020] The present invention further provides a high-voltage SVG dynamic compensation system, comprising the high-voltage SVG dynamic compensation device described above, and further comprising:

[0021] A transformer, which is connected in series on the main line between the power grid and the load;

[0022] The SVG compensation module and the capacitor compensation module are connected in parallel on the main line between the transformer and the load;

[0023] The first parameter acquisition unit is arranged on the main line between the transformer and the power grid, and the second parameter acquisition unit is arranged on the main line between the transformer and the load.

[0024] Furthermore, the high-voltage SVG dynamic compensation system further includes:

[0025] A protection circuit is electrically connected to the main control unit, and the protection circuit is connected in parallel to the main line between the transformer and the load.

[0026] The present invention also provides a high-voltage SVG dynamic compensation method, which compensates the above-mentioned high-voltage SVG dynamic compensation system, comprising the following steps:

[0027] S1, the second parameter acquisition unit collects the three-phase current, three-phase voltage and load current on the main line between the transformer and the load for sampling, and sends the collected data to the main control unit;

[0028] S2, the main control unit determines whether the high-voltage SVG dynamic compensation system is in balance according to the data sent by the second parameter acquisition unit. If it is unbalanced, the current value to be converted for each phase or the reactive current to be compensated or the current value used for voltage regulation is calculated to obtain the compensation current, and the capacitor compensation module is controlled to compensate the high-voltage SVG dynamic compensation system according to the calculation result;

[0029] S3, the first parameter acquisition unit acquires the current mutual inductance parameter and the voltage mutual inductance parameter of the transformer, and sends the acquired data to the main control unit;

[0030] S4. The main control unit sends the data sent by the first parameter acquisition unit together with the result calculated in S2 to the SVG compensation module, and the SVG compensation module starts to compensate the high-voltage SVG dynamic compensation system.

[0031] The beneficial effects of the present invention are:

[0032] 1. In the high-voltage SVG dynamic compensation device of the present invention, considering that long-distance high-voltage power lines generate a certain amount of reactive power, a first parameter acquisition unit is provided to detect the current mutual inductance or voltage mutual inductance parameters of the transformer and send them to the SVG compensation module to achieve reactive compensation for the transmission line;

[0033] 2. In the high-voltage SVG dynamic compensation device of the present invention, the SVG compensation module and the capacitor compensation module are used in combination to reduce the capacity requirement of the system for the SVG compensation module while ensuring the reactive power compensation effect of the system.

[0034] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the high-voltage SVG dynamic compensation system of the present invention;

[0036] Figure 2 The figure is a flow chart of the high voltage SVG dynamic compensation method according to the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0038] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 therefore cannot be understood as a limitation on the present invention.

[0039] Example 1

[0040] An embodiment of the present invention provides a high-voltage SVG dynamic compensation device, comprising:

[0041] Main control unit;

[0042] An SVG compensation module, which is electrically connected to the main control unit;

[0043] A capacitance compensation module, which is electrically connected to the main control unit;

[0044] A first parameter acquisition unit, which is electrically connected to the main control unit;

[0045] The second parameter acquisition unit is electrically connected to the main control unit.

[0046] Furthermore, in the high-voltage SVG dynamic compensation device, the first parameter acquisition unit includes a current transformer.

[0047] Furthermore, in the high-voltage SVG dynamic compensation device, the first parameter acquisition unit includes a voltage transformer.

[0048] Furthermore, in the high-voltage SVG dynamic compensation device, the second parameter acquisition unit includes a three-phase current acquisition module, a three-phase voltage acquisition module and a load current acquisition module.

[0049] Furthermore, in the high-voltage SVG dynamic compensation device, the SVG compensation module is a 50kvarSVG compensation module.

[0050] Furthermore, in the high-voltage SVG dynamic compensation device, the capacitor compensation module is a 50kvarSVC compensation module.

[0051] Furthermore, in the high-voltage SVG dynamic compensation device, the main control unit includes:

[0052] A control module, which is electrically connected to the first parameter acquisition unit and the second parameter acquisition unit;

[0053] A control driving circuit is electrically connected to the control module, and the SVG compensation module and the capacitance compensation module are electrically connected to the control driving circuit respectively.

[0054] Example 2

[0055] like Figure 1 As shown, an embodiment of the present invention provides a high-voltage SVG dynamic compensation system, comprising the above-mentioned high-voltage SVG dynamic compensation device, and further comprising:

[0056] A transformer, which is connected in series on the main line between the power grid and the load;

[0057] The SVG compensation module and the capacitor compensation module are connected in parallel on the main line between the transformer and the load;

[0058] The first parameter acquisition unit is arranged on the main line between the transformer and the power grid, and the second parameter acquisition unit is arranged on the main line between the transformer and the load.

[0059] Furthermore, the high-voltage SVG dynamic compensation system further includes:

[0060] A protection circuit is electrically connected to the main control unit, and the protection circuit is connected in parallel to the main line between the transformer and the load.

[0061] Example 3

[0062] like Figure 2 As shown, an embodiment of the present invention provides a high-voltage SVG dynamic compensation method, which compensates the above-mentioned high-voltage SVG dynamic compensation system, including the following steps:

[0063] S1, the second parameter acquisition unit collects the three-phase current, three-phase voltage and load current on the main line between the transformer and the load for sampling, and sends the collected data to the main control unit;

[0064] S2, the main control unit determines whether the high-voltage SVG dynamic compensation system is in balance according to the data sent by the second parameter acquisition unit. If it is unbalanced, the current value to be converted for each phase or the reactive current to be compensated or the current value used for voltage regulation is calculated to obtain the compensation current, and the capacitor compensation module is controlled to compensate the high-voltage SVG dynamic compensation system according to the calculation result;

[0065] S3, the first parameter acquisition unit acquires the current mutual inductance parameter and the voltage mutual inductance parameter of the transformer, and sends the acquired data to the main control unit;

[0066] S4. The main control unit sends the data sent by the first parameter acquisition unit together with the result calculated in S2 to the SVG compensation module, and the SVG compensation module starts to compensate the high-voltage SVG dynamic compensation system.

[0067] Example 4

[0068] The inventor of the present application has discovered that the existing high-voltage SVG dynamic compensation device has problems such as slow response speed and inaccurate compensation when dealing with complex working conditions. For this reason, the present application mainly adopts the following high-voltage SVG dynamic compensation device, including a main control unit, an SVG compensation module, a capacitor compensation module, a first parameter acquisition unit and a second parameter acquisition unit, which achieves the effect of improving the system response speed and compensation accuracy. The present application is further described in detail below.

[0069] The high-voltage SVG dynamic compensation device provided in the embodiment of the present application includes a main control unit, an SVG compensation module, a capacitor compensation module, a first parameter acquisition unit and a second parameter acquisition unit. The main control unit is electrically connected to each module, responsible for receiving data from the first parameter acquisition unit and the second parameter acquisition unit, and making control decisions based on the data.

[0070] Specifically, the main control unit includes a control module and a control drive circuit. The control module is electrically connected to the first parameter acquisition unit and the second parameter acquisition unit, and is used to receive and process data sent by the two units. The control drive circuit is electrically connected to the control module, and is electrically connected to the SVG compensation module and the capacitance compensation module respectively, and is used to transmit control signals to the two modules so that they perform corresponding actions.

[0071] The SVG compensation module is a 50kVAR SVG compensation module, which mainly includes an inverter, a filter and a controller. The inverter is used to generate the required reactive current, the filter is used to eliminate harmonics, and the controller is responsible for coordinating the work of the entire module. In this embodiment, IGBT (insulated gate bipolar transistor) can be used as the main component of the inverter, or MOSFET (metal oxide field effect transistor) can be selected. These two components have high efficiency and reliability in high-frequency switching applications. The filter can choose LC filter or RLC filter. The former is suitable for low-frequency applications, while the latter is more suitable for high-frequency applications.

[0072] The capacitor compensation module is also a 50kVAR SVC compensation module, which is mainly composed of a fixed capacitor bank and a thyristor switching capacitor bank. The fixed capacitor bank is used to provide a stable baseline reactive power support, while the thyristor switching capacitor bank can be dynamically adjusted according to actual needs. The fixed capacitor bank usually uses film capacitors or ceramic capacitors, which have lower losses and longer service life; the thyristor switching capacitor bank uses a bidirectional thyristor (TRIAC) as a switching element to achieve fast response.

[0073] The first parameter acquisition unit is mainly used to collect parameters on the power grid side, including current transformers and voltage transformers. Current transformers are used to measure the current in the power grid. Commonly used types include ring current transformers and split current transformers, both of which can accurately reflect the current changes in the power grid. Voltage transformers are used to measure the voltage level in the power grid. Common types include electromagnetic voltage transformers and electronic voltage transformers. The former has higher accuracy, while the latter is smaller and easier to install.

[0074] The second parameter acquisition unit is mainly used to collect parameters on the load side, including a three-phase current acquisition module, a three-phase voltage acquisition module, and a load current acquisition module. The three-phase current acquisition module and the three-phase voltage acquisition module usually use Hall sensors or fluxgate sensors, which can monitor the instantaneous value of three-phase AC in real time. The load current acquisition module can use a clamp meter or a shunt resistor. The former is suitable for use in places where the lines are more crowded, while the latter is more suitable for precision measurement occasions.

[0075] After receiving the data from the first parameter acquisition unit and the second parameter acquisition unit, the control module of the main control unit will perform comprehensive analysis and calculation. If the system is detected to be unbalanced, that is, the current or voltage of a phase is abnormal, the control module will calculate the reactive current or voltage regulation current that needs to be compensated, and send instructions to the SVG compensation module through the control drive circuit. After receiving the instruction, the SVG compensation module will quickly adjust its output to achieve the purpose of balancing the system. In the whole process, the capacitor compensation module will play a role in the initial stage, and then gradually withdraw, allowing the SVG compensation module to take on the main compensation task.

[0076] The implementation principle of this embodiment is:

[0077] Accurate monitoring: Through the joint work of the first parameter acquisition unit and the second parameter acquisition unit, comprehensive monitoring of both the power grid and the load is achieved, improving the sensitivity and accuracy of the system.

[0078] Fast response: The SVG compensation module has the ability of high-speed response and can adjust reactive power in a short time to ensure the stability of the system.

[0079] Strong flexibility: The combination of capacitor compensation module and SVG compensation module not only retains the advantages of traditional SVC, but also introduces the advanced characteristics of SVG, making the system adaptable to various complex working conditions.

[0080] High safety: The main control unit accurately controls the actions of each module by controlling the drive circuit, avoiding over-compensation or under-compensation and ensuring the safe operation of the system.

[0081] Example 5

[0082] The difference between this embodiment and the above embodiment is that a protection circuit is added and described in detail. The protection circuit is electrically connected to the main control unit and connected in parallel to the main line between the transformer and the load. The main function of the protection circuit is to immediately cut off the power supply when a system failure occurs to prevent damage to equipment and injury to personnel.

[0083] Specifically, the protection circuit includes the following parts:

[0084] Overcurrent protection: When the line current is detected to exceed the preset threshold, the protection circuit will trigger the circuit breaker to trip and cut off the power supply. This can be achieved by current transformers and microprocessors. The current transformer detects the current and the microprocessor compares the current value with the set value and activates the circuit breaker once the threshold is exceeded.

[0085] Short circuit protection: When a short circuit occurs, the protection circuit will immediately cut off the power supply to prevent excessive current from damaging the equipment. Short circuit protection is usually achieved through fast-acting fuses or fast circuit breakers, which can react within a few milliseconds and effectively protect the equipment.

[0086] Overvoltage protection: When the line voltage is detected to exceed the preset threshold, the protection circuit will also activate the circuit breaker to cut off the power supply. This can be achieved by a voltage transformer and a microprocessor. The voltage transformer detects the voltage and the microprocessor compares the voltage value with the set value and activates the circuit breaker once the threshold is exceeded.

[0087] Grounding protection: When the device housing is detected to be energized, the protection circuit will immediately cut off the power supply to prevent electric shock accidents. Grounding protection is usually achieved through a leakage protector, which can quickly cut off the power supply when a leakage current is detected.

[0088] The design of the protection circuit also needs to consider the following aspects:

[0089] Redundant design: To improve the reliability of the system, the protection circuit adopts multiple protection mechanisms. Even if one component fails, other components can continue to work.

[0090] Self-diagnostic function: The protection circuit has a built-in self-diagnostic function, which regularly checks its own status to ensure that all components are working properly.

[0091] Alarm function: When the protection circuit is activated, an audible and visual alarm will sound to remind the operator to take measures.

[0092] The implementation principle of this embodiment is:

[0093] Comprehensive protection: The protection circuit covers multiple aspects such as over-current protection, short-circuit protection, over-voltage protection and grounding protection, forming a multi-level protection system.

[0094] Fast response: All parts of the protection circuit are characterized by fast response, which can cut off the power supply within milliseconds, minimizing the impact of faults.

[0095] High reliability: Through redundant design and self-diagnosis function, the protection circuit greatly improves the reliability of the system and reduces the risk of system downtime due to single point failure.

[0096] Easy to maintain: The protection circuit is equipped with an alarm function, which makes it easy for operators to find problems and perform repairs in time, thus extending the service life of the equipment.

[0097] Example 6

[0098] The difference between this embodiment and the above embodiment is that a new communication interface is introduced to enable the main control unit to communicate with other intelligent devices to achieve remote monitoring and control. This newly added function makes the high-voltage SVG dynamic compensation device more intelligent and improves the management and maintenance efficiency of the system.

[0099] Specifically, the main control unit adds a communication module that can support multiple communication protocols, such as Modbus, CAN bus, Ethernet, etc. The communication module is connected to external devices through a serial interface or a network interface to achieve real-time data transmission. For example, the main control unit can be connected to the SCADA (Supervisory Control and Data Acquisition) system through an Ethernet interface to upload the collected data to the central server for management personnel to view and analyze. In addition, managers can also send control instructions through mobile terminal APP to achieve remote control.

[0100] The design of the communication module also needs to consider the following aspects:

[0101] Strong compatibility: The communication module supports multiple standard protocols and can seamlessly connect with equipment from different manufacturers.

[0102] Data encryption: The communication module has a built-in data encryption algorithm to ensure the security of data transmission and prevent it from being stolen or tampered with.

[0103] Strong anti-interference ability: The communication module adopts shielding technology and differential signal transmission technology to effectively suppress external interference and ensure data integrity.

[0104] Low power consumption: The communication module consumes very little power in standby mode, which prolongs the battery life and is particularly suitable for long-term unattended scenarios.

[0105] The implementation principle of this embodiment is:

[0106] Interconnection: By introducing the communication module, the main control unit can communicate with other smart devices to form a complete Internet of Things system, enhancing the intelligence of the system.

[0107] Remote monitoring: The support of the communication module allows managers to check the system status anytime and anywhere, discover potential problems in a timely manner, and improve the system's operation and maintenance efficiency.

[0108] Security guarantee: The communication module has data encryption and anti-interference capabilities, ensuring the security and reliability of data transmission.

[0109] Energy saving and environmental protection: The communication module consumes very low power in standby mode, which helps to reduce overall energy consumption and is in line with the development trend of green and low-carbon.

[0110] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A high voltage SVG dynamic compensation device, characterized in that: include: Main control unit; An SVG compensation module, which is electrically connected to the main control unit; A capacitance compensation module, which is electrically connected to the main control unit; A first parameter acquisition unit, which is electrically connected to the main control unit; The second parameter acquisition unit is electrically connected to the main control unit.

2. A high voltage SVG dynamic compensation device as claimed in claim 1, characterized in that: The first parameter acquisition unit includes a current transformer.

3. A high voltage SVG dynamic compensation device as claimed in claim 2, characterized in that: The first parameter acquisition unit includes a voltage transformer.

4. A high voltage SVG dynamic compensation device as claimed in claim 3, characterized in that: The second parameter acquisition unit includes a three-phase current acquisition module, a three-phase voltage acquisition module and a load current acquisition module.

5. A high voltage SVG dynamic compensation device as claimed in claim 1, characterized in that: The SVG compensation module is a 50kvarSVG compensation module.

6. A high voltage SVG dynamic compensation device as claimed in claim 5, characterized in that: The capacitor compensation module is a 50kvarSVC compensation module.

7. A high voltage SVG dynamic compensation device according to any one of claims 1 to 6, characterized in that: The main control unit comprises: A control module, which is electrically connected to the first parameter acquisition unit and the second parameter acquisition unit; A control driving circuit is electrically connected to the control module, and the SVG compensation module and the capacitance compensation module are electrically connected to the control driving circuit respectively.

8. A high voltage SVG dynamic compensation system, characterized in that: The high-voltage SVG dynamic compensation device according to claim 7 further comprises: A transformer, which is connected in series on the main line between the power grid and the load; The SVG compensation module and the capacitor compensation module are connected in parallel on the main line between the transformer and the load; The first parameter acquisition unit is arranged on the main line between the transformer and the power grid, and the second parameter acquisition unit is arranged on the main line between the transformer and the load.

9. A high voltage SVG dynamic compensation system as claimed in claim 8, characterized in that: Also includes: A protection circuit is electrically connected to the main control unit, and the protection circuit is connected in parallel to the main line between the transformer and the load.

10. A high-voltage SVG dynamic compensation method, for compensating the high-voltage SVG dynamic compensation system according to claim 8 or 9, characterized in that: The following steps are involved: S1, the second parameter acquisition unit collects the three-phase current, three-phase voltage and load current on the main line between the transformer and the load for sampling, and sends the collected data to the main control unit; S2, the main control unit determines whether the high-voltage SVG dynamic compensation system is in balance according to the data sent by the second parameter acquisition unit. If it is unbalanced, the current value to be converted for each phase or the reactive current to be compensated or the current value used for voltage regulation is calculated to obtain the compensation current, and the capacitor compensation module is controlled to compensate the high-voltage SVG dynamic compensation system according to the calculation result; S3, the first parameter acquisition unit acquires the current mutual inductance parameter and the voltage mutual inductance parameter of the transformer, and sends the acquired data to the main control unit; S4. The main control unit sends the data sent by the first parameter acquisition unit together with the result calculated in S2 to the SVG compensation module, and the SVG compensation module starts to compensate the high-voltage SVG dynamic compensation system.

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