Multi-group automatic switching shunt reactor compensation device

Abstract

The utility model relates to a multi-group automatic switching shunt reactor compensation device, which comprises a copper busbar, an isolation grounding switch, a controller and a reactor branch, the output end of the copper busbar is connected with the input end of the isolation grounding switch, the output end of the isolation grounding switch is connected with the reactor branch through the copper busbar, and the controller is connected with the reactor branch through the isolation grounding switch. And the output end of the controller is connected with the input end of the reactor branch. According to the multi-group automatic switching shunt reactor compensation device, voltage and reactive power changes during operation of an electric power system are tracked, the reactors with corresponding capacities are automatically switched, inductive reactive compensation required by the electric power system is provided, the compensation effect is fine and reasonable, the overall cost of the device is reduced, the reliability is improved, the service life is prolonged, and the service life of the device is prolonged. And meanwhile, a high-precision chip controller is adopted, measurement and switching are accurate and reliable, multiple protections such as overvoltage, undervoltage and overcurrent are matched, and safe operation of the multi-group automatic switching shunt reactor compensation device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of reactive power compensation devices, in particular to a compensation device for multiple groups of automatic switching parallel reactors. Background Art

[0002] With the needs of urban construction, the laying volume of high-voltage cable lines is gradually increasing. Compared with overhead lines, the equivalent capacitance value per kilometer of high-voltage cables will be much larger, and the charging power generated will be an order of magnitude higher. In order to better utilize and adjust the charging reactive capacity generated by cable lines, it is necessary to install a certain capacity of inductive reactive compensation equipment in the construction of power grids to compensate for the excess charging reactive power of cable lines when the power grid is operating in a small load mode. Since most of the reactors currently used in power systems are fixed-capacity reactors, their capacity cannot be changed, resulting in a waste of reactor capacity, which is inconsistent with the current theme of "energy conservation and emission reduction".

[0003] In view of the above problems, it is necessary to carry out refined inductive reactive power compensation for the system. Currently, there are mainly the following types of inductive reactive power compensation:

[0004] 1. Shunt reactor: It is a common inductive reactive power compensation device on the market. It has a fixed capacity and cannot be adjusted, which causes waste of reactor capacity and cannot achieve refined compensation. Its advantages are low price, high operating reliability, long service life and high user acceptance.

[0005] 2. Magnetic valve controllable reactor: It consists of a parallel reactor and a control part. The DC magnetic flux generated by the DC control current in the control loop saturates the working core column. The equivalent capacity of the controllable reactor is increased. The magnetic saturation of the core can be changed by adjusting the size of the thyristor trigger delay angle, thereby achieving the purpose of controlling the reactor capacity. Its advantages are that it can smoothly adjust the output inductive reactive power and has a fast response speed. Its disadvantages are high price and poor operating reliability.

[0006] 3. SVG reactive power compensation device: a typical power electronic device. Its basic principle is that a self-commutated bridge circuit is directly connected to the power grid in parallel through a reactor or a transformer. By properly adjusting the phase and amplitude of the output voltage on the AC side of the bridge circuit, or directly controlling the AC side current, the circuit can absorb or emit reactive current that meets the requirements, thereby achieving the purpose of dynamic reactive power compensation. It has the advantages of good dynamic reactive power compensation performance, support for compensation of unbalanced loads and harmonic control, and fast response speed. Its disadvantages are short service life, poor stability, high price, and high requirements for the operating environment.

[0007] Therefore, a multi-group automatic switching parallel reactor compensation device is proposed to solve the above problems. Utility Model Content

[0008] 1. Technical issues to be resolved

[0009] In view of the shortcomings of the existing technology, the utility model provides a multi-group automatic switching parallel reactor compensation device, which has the advantages of fine and reasonable compensation effect, low cost, high reliability and long service life. It solves the problems of short service life, poor stability, high price, poor operation reliability and high requirements for the operating environment of the existing technology.

[0010] (II) Technical solution

[0011] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a multi-group automatic switching parallel reactor compensation device, comprising a copper busbar, an isolating grounding switch, a controller and a reactor branch, the output end of the copper busbar is connected to the input end of the isolating grounding switch, the output end of the isolating grounding switch is connected to the reactor branch through the copper busbar, and the output end of the controller is connected to the input end of the reactor branch.

[0012] Furthermore, the reactor branch includes a vacuum contactor, a current transformer, a zinc oxide lightning arrester and a shunt reactor, the vacuum contactor is connected to the copper busbar at the output end of the isolation grounding switch, the output end of the vacuum contactor is connected to the input end of the current transformer, the output end of the current transformer is connected to the incoming line end of the shunt reactor, and the input end of the zinc oxide lightning arrester is connected to the output end of the vacuum contactor.

[0013] Furthermore, the number of the reactor branches is not less than one, a plurality of the reactor branches are connected in parallel, the copper busbar is supported by an insulator of a live display, and a probe of the live display is connected to the copper busbar.

[0014] Furthermore, the controller is a high-precision chip controller, which is used to collect voltage and current signals on the low-voltage side of the main transformer, calculate the system reactive power shortage and voltage fluctuation range, comprehensively consider voltage fluctuations and reactive power shortages, and automatically put into operation or remove reactors of corresponding capacity.

[0015] Furthermore, the vacuum contactor is connected in series in each reactor branch.

[0016] Furthermore, the vacuum contactor is used to switch the reactor branch on and off according to the controller signal, and the current transformer is used to provide secondary current for protection and measurement, so that the controller can determine whether each reactor branch is energized and control the device's overvoltage, undervoltage and overcurrent multiple protection actions.

[0017] Furthermore, the zinc oxide lightning arrester is used to protect multiple groups of automatically switched parallel reactor compensation devices from damage by lightning and operating overvoltage. The parallel reactor is used to provide inductive reactive power, compensate for the capacitive charging power of the power system, limit the increase of the power frequency voltage and the operating overvoltage in the system, improve the reactive power flow in the light load line, and prevent the voltage from rising.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0020] The multiple sets of automatic switching parallel reactor compensation devices can track the voltage and reactive power changes during the operation of the power system, automatically switch the reactors of corresponding capacity, and provide the required inductive reactive power compensation for the power system. The compensation effect is precise and reasonable, and the overall cost of the device is reduced, the reliability is increased, and the service life is increased. At the same time, a high-precision chip controller is used to make the measurement and switching accurate and reliable, and multiple protections such as overvoltage, undervoltage, and overcurrent are combined to ensure the safe operation of the multiple sets of automatic switching parallel reactor compensation devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the electrical principle of the utility model;

[0022] Figure 2 It is a schematic diagram of the implementation structure of the utility model.

[0023] In the figure: 1 copper busbar, 2 isolating grounding switch, 3 controller, 4 reactor branch, 401 vacuum contactor, 402 current transformer, 403 zinc oxide lightning arrester, 404 shunt reactor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-2In this embodiment, a multi-group automatic switching parallel reactor compensation device includes a copper busbar 1, an isolating grounding switch 2, a controller 3 and a reactor branch 4. The output end of the copper busbar 1 is connected to the input end of the isolating grounding switch 2, the output end of the isolating grounding switch 2 is connected to the reactor branch 4 through the copper busbar 1, the output end of the controller 3 is connected to the input end of the reactor branch 4, the copper busbar 1 is supported by an insulator of a live display, the probe of the live display is connected to the copper busbar 1, the number of reactor branches 4 is not less than one, and multiple reactor branches 4 are connected in parallel.

[0026] Specifically, the controller 3 is a high-precision chip controller. When the capacitive reactive power of the power system exceeds the standard or the voltage fluctuation is too large, the controller 3 will collect the voltage and current signals on the low-voltage side of the main transformer, calculate the system reactive power shortage and the voltage fluctuation range, and comprehensively consider the voltage fluctuation and reactive power shortage to automatically put in or cut off the reactor of the corresponding capacity; if the capacitive reactive power of the power system exceeds the standard or the voltage is too high, the controller 3 can control the reactor to be put into use to provide inductive reactive power for the power system, offset the excess capacitive reactive power of the system, and lower the system voltage; if the capacitive reactive power of the power system is insufficient or the voltage is too low, the controller 3 can control the removal of the reactor that has been put into use to reduce the inductive reactive power of the system, increase the capacitive reactive power of the system, and increase the system voltage to meet the reactive power supply and demand balance of the power grid and improve the power supply quality.

[0027] Specifically, the main function of the isolating grounding switch 2 is to effectively cut off the connection between the device and the power supply when multiple sets of automatic switching parallel reactor compensation devices need to be maintained, overhauled or shut down, ensuring that the device is grounded, thereby ensuring the safety of the operator. The isolating grounding switch 2 consists of a rotatable handle and a movable contact.

[0028] Specifically, the live display is directly installed between the incoming cable and the isolating earthing switch 2, so as to visually display whether multiple groups of automatic switching parallel reactor compensation devices have operating voltage. When the device has operating voltage, the live display flashes to alert the operator that the device is energized, and there is no indication when there is no power.

[0029] Specifically, the reactor branch 4 includes a vacuum contactor 401, a current transformer 402, a zinc oxide lightning arrester 403 and a shunt reactor 404. The vacuum contactor 401 is connected to the copper busbar 1 at the output end of the isolating grounding switch 2. The output end of the vacuum contactor 401 is connected to the input end of the current transformer 402. The output end of the current transformer 402 is connected to the incoming line end of the shunt reactor 404. The input end of the zinc oxide lightning arrester 403 is connected to the output end of the vacuum contactor 401.

[0030] Furthermore, the vacuum contactor 401 is connected in series in each reactor branch 4, and the vacuum contactor 401 is used to switch the reactor branch 4 on and off according to the controller signal, so that the service life of the device is increased and no impact is caused to the system during switching.

[0031] Furthermore, the current transformer 402 is used to provide secondary current for protection and measurement, so that the controller 3 can determine whether each reactor branch 4 is energized and control the overvoltage, undervoltage and overcurrent multiple protection actions of the device.

[0032] Furthermore, zinc oxide lightning arresters 403 are used to protect multiple groups of automatically switched parallel reactor compensation devices from damage by lightning and operating overvoltages, and parallel reactors 404 are used to provide inductive reactive power, compensate for the capacitive charging power of the power system, limit the increase in the power frequency voltage and operating overvoltage in the system, improve the reactive power flow in the light-load line, and prevent voltage increase.

[0033] During implementation, the following steps are followed: first, the voltage and current signals on the low-voltage side of the main transformer are collected through the controller 3, and the system reactive power shortage and voltage fluctuation range are calculated. When it is detected that the system power factor is low or the voltage is unstable, the controller 3 automatically switches on or off the parallel reactor 404 of corresponding capacity to compensate for the reactive power of the system. By automatically switching on and off the parallel reactor 404, the system can adjust the reactive power in real time, so that the power factor of the system reaches the required range, stabilizes the voltage and improves the stability and reliability of the power system.

[0034] In summary, the multiple sets of automatic switching parallel reactor compensation devices can track the voltage and reactive power changes during the operation of the power system, automatically switch the reactors of corresponding capacity, provide the required inductive reactive compensation for the power system, and achieve a precise and reasonable compensation effect. Moreover, the overall cost of the device is reduced, the reliability is increased, and the service life is increased. At the same time, a high-precision chip controller 3 is adopted to make the measurement and switching accurate and reliable, and multiple protections such as overvoltage, undervoltage, and overcurrent are coordinated to ensure the safe operation of the multiple sets of automatic switching parallel reactor compensation devices, thus solving the problems of waste of reactor capacity and high energy consumption caused by the fixed capacity switching of parallel reactors currently commonly used in the market.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-group automatic switching parallel reactor compensation device, comprising a copper busbar (1), an isolating grounding switch (2), a controller (3) and a reactor branch (4), characterized in that: The output end of the copper busbar (1) is connected to the input end of the isolating grounding switch (2), the output end of the isolating grounding switch (2) is connected to the reactor branch (4) through the copper busbar (1), and the output end of the controller (3) is connected to the input end of the reactor branch (4).

2. A multi-group automatic switching parallel reactor compensation device according to claim 1, characterized in that: The reactor branch (4) comprises a vacuum contactor (401), a current transformer (402), a zinc oxide lightning arrester (403) and a shunt reactor (404); the vacuum contactor (401) is connected to the copper busbar (1) at the output end of the isolating grounding switch (2); the output end of the vacuum contactor (401) is connected to the input end of the current transformer (402); the output end of the current transformer (402) is connected to the incoming line end of the shunt reactor (404); and the input end of the zinc oxide lightning arrester (403) is connected to the output end of the vacuum contactor (401).

3. A multi-group automatic switching parallel reactor compensation device according to claim 1, characterized in that: The number of the reactor branches (4) is not less than one, and a plurality of the reactor branches (4) are connected in parallel; the copper busbar (1) is supported by an insulator of a live display, and a probe of the live display is connected to the copper busbar (1).

4. A multi-group automatic switching parallel reactor compensation device according to claim 1, characterized in that: The controller (3) is a high-precision chip controller, and is used to collect voltage and current signals on the low-voltage side of the main transformer, calculate the system reactive power shortage and voltage fluctuation range, comprehensively consider the voltage fluctuation and reactive power shortage, and automatically switch on or off the reactor of corresponding capacity.

5. A multi-group automatic switching parallel reactor compensation device according to claim 2, characterized in that: The vacuum contactor (401) is connected in series in each reactor branch (4).

6. A multi-group automatic switching parallel reactor compensation device according to claim 2, characterized in that: The vacuum contactor (401) is used to switch the reactor branch (4) on and off according to a controller signal, and the current transformer (402) is used to provide a secondary current for protection and measurement, so that the controller (3) can determine whether each reactor branch (4) is energized and control the overvoltage, undervoltage and overcurrent multiple protection actions of the device.

7. A multi-group automatic switching parallel reactor compensation device according to claim 2, characterized in that: The zinc oxide lightning arrester (403) is used to protect multiple groups of automatically switched parallel reactor compensation devices from damage by lightning and operating overvoltage, and the parallel reactor (404) is used to provide inductive reactive power, compensate for the capacitive charging power of the power system, limit the increase of the power frequency voltage and the operating overvoltage in the system, improve the reactive power flow in the light load line, and prevent the voltage from increasing.

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