CN202602298U - Voltage-regulating capacitance-regulating type reactive compensation complete device of high voltage line - Google Patents
Voltage-regulating capacitance-regulating type reactive compensation complete device of high voltage line Download PDFInfo
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Abstract
本实用新型公开了一种高压线路调压调容式无功补偿成套装置，包括箱体和电流互感器，在箱体内设置有调压器、控制器和电容器；调压器连接在高压线路上，并与电容器和控制器相连接，调压器接受控制器的指令，调节电压输出并改变电容器端的电压以改变电容器容量的输出；电流互感器串接在调压器在高压线路上的接入点前端；控制器通过电流互感器与高压线路相连接，采集高压线路的电压与电流，计算高压线路的有功功率和无功功率，并将控制指令发送给调压器对调压器的档位进行调节；电容器用于容性补偿。本实用新型的高压线路调压调容式无功补偿成套装置，具有调压的过程中不存在合闸涌流、对电网无任何冲击、便于调节和维护维修等优点。
The utility model discloses a complete set of reactive power compensation device for voltage regulation and capacity regulation of high-voltage lines, which comprises a box body and a current transformer, and a voltage regulator, a controller and a capacitor are arranged in the box body; the voltage regulator is connected to the high-voltage line, And connected with the capacitor and the controller, the voltage regulator accepts the instructions of the controller, adjusts the voltage output and changes the voltage at the capacitor terminal to change the output of the capacitor capacity; the current transformer is connected in series at the front end of the access point of the voltage regulator on the high-voltage line ;The controller is connected to the high-voltage line through the current transformer, collects the voltage and current of the high-voltage line, calculates the active power and reactive power of the high-voltage line, and sends the control command to the voltage regulator to adjust the gear position of the voltage regulator ; Capacitors are used for capacitive compensation. The utility model's high-voltage line voltage regulation and capacity regulation type reactive power compensation complete set has the advantages of no closing inrush current in the process of voltage regulation, no impact on the power grid, and convenient adjustment and maintenance.
Description
技术领域 technical field
本实用新型涉及一种无功功率补偿装置，尤其是一种用于电力系统的高压线路调压调容式无功补偿成套装置。The utility model relates to a reactive power compensation device, in particular to a complete set of reactive power compensation device for voltage regulation and capacity regulation of high-voltage lines used in electric power systems.
背景技术 Background technique
功率因数和无功平衡是衡量电网质量的重要标志。我国农网普遍存在供电半径长、电压质量差、功率因数低的状况。如果无功能得到有效的平衡，不仅能大大降低电网的损耗，而且对提高电压质量具有重要的意义。但是，目前我国大部分城乡电网功率因数偏低，无功很不平衡。因此提高电网功率因数、平衡无功、提高电压质量、降低线损，在电力系统中有着重大意义。Power factor and reactive power balance are important indicators to measure the quality of power grid. my country's rural power grid generally has a long power supply radius, poor voltage quality, and low power factor. If the non-functional functions are effectively balanced, not only can the loss of the power grid be greatly reduced, but also it is of great significance to improve the voltage quality. However, the power factor of most urban and rural power grids in my country is low at present, and the reactive power is very unbalanced. Therefore, it is of great significance in the power system to improve the power factor of the grid, balance reactive power, improve voltage quality, and reduce line loss.
现今国内线路有2类无功补偿型式：一种为是并接电容器固定补偿，不能实现动态跟踪补偿。二是动态跟踪补偿，级数太少，不能做到精补细补。There are two types of reactive power compensation types in domestic lines today: one is fixed compensation with capacitors connected in parallel, which cannot realize dynamic tracking compensation. The second is dynamic tracking compensation, the number of series is too small, and it is impossible to make fine and fine supplements.
目前国内使用较多的自动补偿类型为线路柱上高压无功补偿装置，主要由电容器组、开关及控制器等组成，并联连接于工频交流三相高压架空线路上，用来改善功率因数、调整网络电压、降低线路损耗。大部分是采用固定接入、手动投切或自动投切的方式接入线路的。固定接入式的线路补偿装置接入输电线路后不进行投切，所以装置结构简单，投资成本低，综合造价低，但是也因此无法根据线路无功负荷的需求变化来改变电容器组的无功出力。并联电容器组的无功出力与系统频率及电容器端电压的平方（Qc=2π?CU2）成正比。如果电网电压运行偏低，无功出力却大大减少，而电网电压运行偏高时，又会大大提高电容器的出力，这样不仅无法调整网络电压，还会大大缩短电容器寿命。At present, the most widely used automatic compensation type in China is the high-voltage reactive power compensation device on the line column, which is mainly composed of capacitor banks, switches and controllers, etc., and is connected in parallel to the power frequency AC three-phase high-voltage overhead line to improve power factor, Adjust network voltage and reduce line loss. Most of them are connected to the lines by fixed access, manual switching or automatic switching. The fixed-access line compensation device does not switch after it is connected to the transmission line, so the device structure is simple, the investment cost is low, and the overall cost is low, but it is also impossible to change the reactive power of the capacitor bank according to the change in the reactive load demand of the line. contribute. The reactive power output of the parallel capacitor bank is proportional to the system frequency and the square of the capacitor terminal voltage (Qc=2π?CU 2 ). If the grid voltage is running low, the reactive power output will be greatly reduced, and when the grid voltage is running high, the output of the capacitor will be greatly increased, which will not only make it impossible to adjust the network voltage, but also greatly shorten the life of the capacitor.
开关投切式的线路补偿装置是通过控制开关的通断来投退电容器组的，有2个方面的弊端。首先，电容器组在投入时会产生大于15倍额定电流的合闸涌流，切除时产生不可避免的操作过电压。这样的方式不仅降低了电容器的寿命（约2～5年），还对电网造成了很大的冲击。其次，如线路无功负荷波动过快，这样断路器、负荷开关动作过于频繁，而且由于投切的极差较大，很容易使线路长期处于过补或欠补的状态，同时也很容易使开关出现机械故障，这样不仅降低了开关的动作安全可靠性，还大大提高了设备的维修成本。The switch switching type line compensation device switches on and off the capacitor bank by controlling the on and off of the switch, which has two disadvantages. First of all, when the capacitor bank is switched on, it will generate a closing inrush current greater than 15 times the rated current, and an inevitable operating overvoltage will be generated when it is cut off. This method not only reduces the life of the capacitor (about 2 to 5 years), but also has a great impact on the power grid. Secondly, if the reactive power load of the line fluctuates too fast, the circuit breaker and load switch will operate too frequently, and because of the large switching range, it is easy to make the line in the state of over-compensation or under-compensation for a long time, and it is also easy to use The switch has a mechanical failure, which not only reduces the safety and reliability of the switch, but also greatly increases the maintenance cost of the equipment.
实用新型内容 Utility model content
本实用新型是为避免上述已有技术中存在的不足之处，提供一种高压线路调压调容式无功补偿成套装置，以避免调压过程中出现合闸涌流、便于调节且易于维护维修。The utility model is to avoid the deficiencies in the above-mentioned prior art, and provides a high-voltage line voltage regulation and capacity regulation type reactive power compensation complete set, so as to avoid closing inrush current during the voltage regulation process, which is easy to adjust and easy to maintain and repair. .
本实用新型首先提供了一种高压线路调压调容式无功补偿成套装置。The utility model firstly provides a complete set of reactive power compensation device for voltage regulation and capacity regulation of high-voltage lines.
高压线路调压调容式无功补偿成套装置，其结构特点是，包括箱体和电流互感器，在所述箱体内设置有调压器、控制器和电容器；The complete set of reactive power compensation device for voltage regulation and capacity regulation of high-voltage lines has the structural characteristics of including a box body and a current transformer, and a voltage regulator, a controller and a capacitor are arranged in the box body;
所述调压器连接在高压线路上，并与电容器和控制器相连接，调压器接受控制器的指令，调节电压输出并改变电容器端的电压以改变电容器容量的输出；The voltage regulator is connected to the high-voltage line and connected to the capacitor and the controller. The voltage regulator accepts the instructions of the controller, adjusts the voltage output and changes the voltage at the capacitor terminal to change the output of the capacitor capacity;
所述电流互感器串接在调压器在高压线路上的接入点前端；The current transformer is connected in series at the front end of the access point of the voltage regulator on the high-voltage line;
所述控制器通过电流互感器与高压线路相连接，采集高压线路的电压与电流，计算高压线路的有功功率和无功功率，并产生控制指令，将控制指令发送给调压器对调压器的档位进行调节；The controller is connected to the high-voltage line through a current transformer, collects the voltage and current of the high-voltage line, calculates the active power and reactive power of the high-voltage line, and generates a control command, which is sent to the voltage regulator to the voltage regulator to adjust the gear position;
所述电容器用于对高压线路进行容性补偿。The capacitor is used for capacitive compensation of the high voltage line.
本实用新型的高压线路调压调容式无功补偿成套装置的结构特点也在于：The structural features of the high-voltage line voltage-regulating and capacity-adjusting reactive power compensation complete set of the utility model also lie in:
所述箱体内还设有避雷器；所述避雷器的一端连接在所述调压器与电容器之间，另一端接地；所述调压器与高压线路之间还设有熔断器。A lightning arrester is also provided in the box; one end of the lightning arrester is connected between the voltage regulator and the capacitor, and the other end is grounded; a fuse is also provided between the voltage regulator and the high-voltage line.
与已有技术相比，本实用新型的有益效果体现在：Compared with the prior art, the beneficial effects of the utility model are reflected in:
调压器极差小，补偿精细，期间调压的过程中不存在合闸涌流，也不产生操作过电压，对电网无任何冲击。箱体采用不锈钢材料焊接而成，具有安全防护性好、防雨性能佳等优点，箱体还采用喷塑防锈工艺处理，外形美观大方，散热性好，便于本装置在高压线路上的安装。本实用新型的无功补偿成套装置，仅仅通过三根电源线和两根电流采样连接线与高压线路相连接，箱体安装在支架上，与高压线路连接方便，安装调试方便，且维修维护方便。同时控制器配置有无线通信功能，可将相关数据传送给控制中心，便于统一管理监控，便于对补偿装置进行集中监控。The voltage regulator has small extreme difference and fine compensation. During the process of voltage regulation, there is no closing inrush current, nor does it generate operating overvoltage, and there is no impact on the power grid. The box body is welded by stainless steel, which has the advantages of good safety protection and good rainproof performance. The box body is also treated with plastic spraying and anti-rust technology. The complete set of reactive power compensation device of the utility model is only connected to the high-voltage line through three power lines and two current sampling connection lines. The box body is installed on the bracket, which is convenient to connect with the high-voltage line, easy to install and debug, and convenient to repair and maintain. At the same time, the controller is equipped with a wireless communication function, which can transmit relevant data to the control center, which facilitates unified management and monitoring, and facilitates centralized monitoring of the compensation device.
本实用新型的高压线路调压调容式无功补偿成套装置，具有调压的过程中不存在合闸涌流、对电网无任何冲击、便于调节和维护维修等优点。The utility model's high-voltage line voltage regulation and capacity regulation type reactive power compensation complete set has the advantages of no closing inrush current in the process of voltage regulation, no impact on the power grid, and convenient adjustment and maintenance.
附图说明 Description of drawings
图1为本实用新型的高压线路调压调容式无功补偿成套装置的原理图。Fig. 1 is a schematic diagram of a complete set of reactive power compensation device for voltage regulation and capacity regulation of high-voltage lines of the present invention.
以下通过具体实施方式，并结合附图对本实用新型作进一步说明。The utility model will be further described below through specific embodiments in conjunction with the accompanying drawings.
具体实施方式 Detailed ways
参见图1，高压线路调压调容式无功补偿成套装置，包括箱体和电流互感器，在所述箱体内设置有调压器、控制器和电容器；Referring to Fig. 1, the high-voltage line voltage regulation and capacity regulation type reactive power compensation complete set includes a box body and a current transformer, and a voltage regulator, a controller and a capacitor are arranged in the box body;
所述调压器连接在高压线路上，并与电容器和控制器相连接，调压器接受控制器的指令，调节电压输出并改变电容器端的电压以改变电容器容量的输出；The voltage regulator is connected to the high-voltage line and connected to the capacitor and the controller. The voltage regulator accepts the instructions of the controller, adjusts the voltage output and changes the voltage at the capacitor terminal to change the output of the capacitor capacity;
所述电流互感器串接在调压器在高压线路上的接入点前端；The current transformer is connected in series at the front end of the access point of the voltage regulator on the high-voltage line;
所述控制器通过电流互感器与高压线路相连接，采集高压线路的电压与电流，计算高压线路的有功功率和无功功率，并产生控制指令，将控制指令发送给调压器对调压器的档位进行调节；The controller is connected to the high-voltage line through a current transformer, collects the voltage and current of the high-voltage line, calculates the active power and reactive power of the high-voltage line, and generates a control command, which is sent to the voltage regulator to the voltage regulator to adjust the gear position;
所述电容器用于对高压线路进行容性补偿。The capacitor is used for capacitive compensation of the high voltage line.
电流互感器连接在高压线路上，将高压电流转换为控制器可以接收和测量的二次电流。控制器采集电流互感器输出的电流和调压器输出的系统电压，并根据采集到的电压、电流等参数，进而分析计算得到高压线路的有功功率、无功功率和功率因数等电气参数，并根据这些电气参数生成相应的控制指令，将控制指令发送给调压器，使得调压器自动调节档位，控制电压输出。调压器具有9档电压输出，对应的电容器也有9种容量对线路进行无功功率补偿。调压器极差小，补偿精细，期间调压的过程中不存在合闸涌流，也不产生操作过电压，对电网无任何冲击。箱体采用不锈钢材料焊接而成，具有安全防护性好、防雨性能佳等优点，箱体还采用喷塑防锈工艺处理，外形美观大方，散热性好，便于本装置在高压线路上的安装。本实用新型的无功补偿成套装置，仅仅通过三根电源线和两根电流采样连接线与高压线路相连接，箱体安装在支架上，与高压线路连接方便，安装调试方便，且维修维护方便。同时控制器配置有无线通信功能，可将相关数据传送给控制中心，便于统一管理监控，便于对补偿装置进行集中监控。A current transformer is connected to the high voltage line and converts the high voltage current into a secondary current that the controller can receive and measure. The controller collects the current output by the current transformer and the system voltage output by the voltage regulator, and then analyzes and calculates the electrical parameters such as active power, reactive power, and power factor of the high-voltage line according to the collected parameters such as voltage and current, and Generate corresponding control instructions according to these electrical parameters, and send the control instructions to the voltage regulator, so that the voltage regulator automatically adjusts the gear and controls the voltage output. The voltage regulator has 9 levels of voltage output, and the corresponding capacitors also have 9 capacities to compensate the reactive power of the line. The voltage regulator has small extreme difference and fine compensation. During the process of voltage regulation, there is no closing inrush current, nor does it generate operating overvoltage, and there is no impact on the power grid. The box body is welded by stainless steel, which has the advantages of good safety protection and good rainproof performance. The box body is also treated with plastic spraying and anti-rust technology. The complete set of reactive power compensation device of the utility model is only connected to the high-voltage line through three power lines and two current sampling connection lines. The box body is installed on the bracket, which is convenient to connect with the high-voltage line, easy to install and debug, and convenient to repair and maintain. At the same time, the controller is equipped with a wireless communication function, which can transmit relevant data to the control center, which facilitates unified management and monitoring, and facilitates centralized monitoring of the compensation device.
所述箱体内还设有避雷器；所述避雷器的一端连接在所述调压器与电容器之间，另一端接地；所述调压器与高压线路之间还设有熔断器。通过避雷器和熔断器，可在雷击或过载时起保护作用，提高系统的安全性能。A lightning arrester is also provided in the box; one end of the lightning arrester is connected between the voltage regulator and the capacitor, and the other end is grounded; a fuse is also provided between the voltage regulator and the high-voltage line. Lightning arresters and fuses can protect against lightning strikes or overload and improve the safety performance of the system.
本实用新型的高压线路调压调容式无功补偿成套装置，采用电容器组固定接入，控制器采集系统电压和线路电流，分析计算出系统有功功率、无功功率等各项电气参数，根据控制策略，对调压器进行档位调节，改变电容器的端电压，从而改变电容器的输出容量。根据Q=2π?CU2原理，电容器组C值总量不变，端电压从100%U降到50%U时，其输出容量就可以在（100%~25%）×Q之间变化，极差小，补偿精细，期间调压的过程中不存在合闸涌流，也不产生操作过电压，对电网无任何冲击。The utility model's high-voltage line voltage-regulating capacity-adjusting reactive power compensation complete set adopts capacitor banks to be fixedly connected, and the controller collects system voltage and line current, analyzes and calculates various electrical parameters such as system active power and reactive power, according to The control strategy is to adjust the gear of the voltage regulator to change the terminal voltage of the capacitor, thereby changing the output capacity of the capacitor. According to the principle of Q=2π?CU 2 , the total C value of the capacitor bank remains unchanged, and when the terminal voltage drops from 100%U to 50%U, its output capacity can be changed between (100%~25%)×Q, The extreme difference is small, the compensation is fine, there is no closing inrush current in the process of voltage regulation, and there is no operating overvoltage, and there is no impact on the power grid.
通过对9档位调压器进行调节，调压器有9档位电压输出，固定电容器相应也有9种容量对线路无功进行补偿，电容器输出容量见下表（以电容器安装容量300kvar为例）：By adjusting the 9-position voltage regulator, the voltage regulator has 9-position voltage output, and the fixed capacitor correspondingly has 9 types of capacity to compensate the reactive power of the line. The output capacity of the capacitor is shown in the table below (take the capacitor installation capacity of 300kvar as an example) :
调压器额定输出容量计算表Voltage regulator rated output capacity calculation table
无功补偿装置是安装在高压输电线路上，维修和管理很不方便，为保证无功补偿装置可靠运行，我公司设计的一体化结构，将电容器，调压器及其他组成部分安装在一个整体箱体中，箱体结构充分考虑到了安全性及散热条件，确保了装置能够长时间无故障运行，设备安装时将箱体放置在安装支架上，只需引进三相电源线及两根采样电流线，安装调试及其方便。The reactive power compensation device is installed on the high-voltage transmission line, which is very inconvenient to maintain and manage. In order to ensure the reliable operation of the reactive power compensation device, the integrated structure designed by our company installs capacitors, voltage regulators and other components in a whole In the box, the box structure fully considers the safety and heat dissipation conditions, ensuring that the device can run without failure for a long time. When the equipment is installed, the box is placed on the installation bracket, and only three-phase power lines and two sampling current line, easy to install and debug.
为加强管理和数据统计方便，我公司配置的控制器有强大的通讯功能，通过无线技术将数据传输到相关部门，我公司后台分析及管理软件将发挥其监控、统计和控制功能，装置的运行状态及工作状况将会一目了然。In order to enhance the convenience of management and data statistics, the controller configured by our company has a powerful communication function, and the data is transmitted to relevant departments through wireless technology. The status and working status will be clear at a glance.
线路调压调容式无功补偿成套装置的大面积使用，将会在高压线路提高电网功率因数、平衡无功、提高电压质量、降低线损等方面具有重要积极的作用。The large-area use of line voltage regulation and capacity regulation reactive power compensation complete sets of devices will play an important and positive role in improving the power factor of the power grid, balancing reactive power, improving voltage quality, and reducing line losses on high-voltage lines.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490432A (en) * | 2013-09-30 | 2014-01-01 | 桂林电子科技大学 | Reactive compensation device and method for partially regulating voltages and capacitance of three-phase four-wire power grid |
| CN107465200A (en) * | 2017-09-30 | 2017-12-12 | 孙长坡 | Reactive power compensation device and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490432A (en) * | 2013-09-30 | 2014-01-01 | 桂林电子科技大学 | Reactive compensation device and method for partially regulating voltages and capacitance of three-phase four-wire power grid |
| CN103490432B (en) * | 2013-09-30 | 2015-07-22 | 桂林电子科技大学 | Reactive compensation device and method for partially regulating voltages and capacitance of three-phase four-wire power grid |
| CN107465200A (en) * | 2017-09-30 | 2017-12-12 | 孙长坡 | Reactive power compensation device and system |
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