CN211908375U

CN211908375U - Hybrid static high-voltage reactive dynamic compensation device

Info

Publication number: CN211908375U
Application number: CN202020208581.9U
Authority: CN
Inventors: 程祥; 刘正魁
Original assignee: Maiaote Liaoning Technology Co ltd
Current assignee: Maiaote Liaoning Technology Co ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2020-11-10
Anticipated expiration: 2030-02-25

Abstract

The utility model relates to a reactive dynamic compensation device of static high pressure of hybrid, include: the TSC cabinet is connected with the low-voltage side of the boosting transformer cabinet; the HVC cabinet is connected to the high-voltage side of the booster transformer cabinet through a control cabinet; and the control cabinet is connected with a power bus of the power distribution system. The utility model provides a technical scheme adopts low pressure TSC to add the compensation mode that step up transformer and high pressure HVC combined together simultaneously, has both guaranteed that real-time quick fine and smooth compensation system is idle, has satisfied the requirement of industrial and mining power factor, has practiced thrift the maintenance cost in investment and equipment later stage again greatly. The utility model discloses can reduce power supply system's network loss to impact nature load, time-varying load real-time supervision, dynamic compensation, stable system voltage, improve characteristics such as electric energy quality and show, can bring huge economic benefits and social for the user.

Description

Hybrid static high-voltage reactive dynamic compensation device

Technical Field

The utility model relates to an electricity consumption control technology field, concretely relates to idle dynamic compensation device of static high pressure of hybrid.

Background

The national grid company transmits power to any enterprise, which has a requirement on the power factor of the enterprise, generally not lower than 0.92, and in some areas, even not lower than 0.95 or 0.98. More than 90% of electric equipment of industrial and mining enterprises are asynchronous motors, the asynchronous motors are inductive loads, and natural power factors of the asynchronous motors are less than 0.9, so that each enterprise needs to perform capacitive reactive compensation.

When the power utilization equipment in the enterprise is started infrequently, the method comprises the following steps: the load fluctuation is not large, and the requirement of a power grid company on the enterprise power factor of 0.92 can be met by adopting an HVC or TSC switching grouped capacitor mode. However, when the capacity of the electric equipment of an enterprise is large and the start and stop are frequent, the total load fluctuation is large, and the requirement of 0.95 or more of power factors cannot be met by adopting an HVC or TSC switching mode. Adopt the SVG mode can satisfy the requirement, but SVG one-time investment is very high, and the power electronics IGBT who adopts in the SVG device gives out heat very big, consequently needs high-power air conditioner for the device cooling to the maintenance cost who produces is very high.

At present, the domestic high-voltage reactive power compensation device mainly comprises a contactor switching capacitor (HVC), a Thyristor Switching Capacitor (TSC) and a Static Var Generator (SVG) adopting a full-control device. The interval between two HVC continuous switching needs 6-10 minutes, the TSC continuous switching time is about 20ms, but both the two switching modes need group switching, and when the compensation capacity is unreasonable, the compensation capacity is easy to be over-compensated or under-compensated, and the power factor requirement required by industrial and mining cannot be met; the SVG has the advantages of high corresponding speed, wide compensation range, high investment, large heat productivity and high later maintenance cost.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at overcoming the not enough of prior art, providing a reactive dynamic compensation device of static high pressure of hybrid to solve among the prior art high-voltage reactive compensation device, reduce equipment disposable investment when can't satisfy power factor technical requirement, reduce the problem of later maintenance cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a hybrid static high voltage reactive dynamic compensation device, comprising:

an HVC cabinet, a control cabinet, a booster transformer cabinet and a TSC cabinet which are connected in sequence from left to right, wherein,

the TSC cabinet is connected to the low-voltage side of the booster transformer cabinet;

the HVC cabinet is connected to the high-voltage side of the booster transformer cabinet through a control cabinet;

and the control cabinet is connected with a power bus of the power distribution system.

Preferably, the TSC cabinet is connected to the low-voltage side of the boosting transformer through a 0.4kV bus.

Preferably, the HVC cabinet is connected with the control cabinet through a 10kV bus.

Preferably, the HVC cabinet comprises:

HVC-1100 and HVC-800 connected in parallel on the 10kV bus, wherein,

the cabinet body installation capacity of the HVC-1100 is 1100 Kvar;

the cabinet body installation capacity of the HVC-800 is 800 Kvar.

Preferably, the TSC cabinet comprises:

10 groups of thyristor switched capacitors TSC connected in parallel on the 0.4kV bus;

the TSC cabinet body installation capacity is 600 Kvar.

Preferably, a liquid crystal display is arranged on the control cabinet.

Preferably, the switching mode of the control cabinet comprises automatic switching and manual switching.

Preferably, the HVC cabinet, the control cabinet, the booster transformer cabinet and the TSC cabinet are installed on a channel steel pre-buried on the ground and welded on the channel steel.

Preferably, the channel steel is embedded in the ground through an embedded part and is connected with the ground net.

Preferably, the embedded part is formed by pouring reinforced concrete.

The utility model adopts the above technical scheme, possess following beneficial effect at least:

the compensation mode that the low-voltage TSC and the booster transformer are combined with the high-voltage HVC is adopted, so that the reactive power of a real-time, rapid and fine compensation system is guaranteed, the requirement of industrial and mining power factors is met, and the investment and the later maintenance cost of equipment are greatly saved. The utility model provides a technical scheme can be to impulsive nature load, time-varying load real-time supervision, dynamic compensation, stable system voltage reduces power supply system's network loss, improves characteristics such as electric energy quality and show, can bring huge economic benefits and social for the user.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic installation diagram of a hybrid static high-voltage reactive dynamic compensation device according to an embodiment of the present invention;

fig. 2A to fig. 2B are internal main wiring diagrams of a hybrid static high-voltage reactive dynamic compensation device according to an embodiment of the present invention;

fig. 3 is a partial enlarged view of an installation schematic diagram of a hybrid static high-voltage reactive dynamic compensation device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Referring to fig. 1, an embodiment of the present invention provides a hybrid static high-voltage reactive dynamic compensation device, including:

the HVC cabinet 100, the control cabinet 200, the booster transformer cabinet 300 and the TSC cabinet 400 are connected from left to right in sequence, wherein,

the TSC cabinet 400 is connected to the low-voltage side of the booster transformer cabinet 300;

the HVC cabinet 100 is connected to the high-voltage side of the step-up transformer cabinet 300 through a control cabinet 200;

the control cabinet 200 is connected with a power bus of the power distribution system.

It can be understood that the technical scheme provided by the utility model, adopt low pressure TSC to add the compensation mode that step up transformer and high pressure HVC combined together simultaneously, both guaranteed real-time quick exquisite compensation system idle, satisfied industrial and mining power factor's requirement, practiced thrift the maintenance cost in investment and equipment later stage again greatly. The utility model provides a technical scheme can be to impulsive nature load, time-varying load real-time supervision, dynamic compensation, stable system voltage reduces power supply system's network loss, improves characteristics such as electric energy quality and show, can bring huge economic benefits and social for the user.

Referring to fig. 2A and 2B, the TSC cabinet 400 is preferably connected on the low voltage side of the step-up transformer 300 by a 0.4kV bus.

Referring to fig. 2A and 2B, the HVC cabinet 100 is preferably connected to the control cabinet 200 via a 10kV bus.

Referring to fig. 2A and 2B, preferably, the HVC cabinet 100 includes:

HVC-1100 and HVC-800 connected in parallel on the 10kV bus, wherein,

the cabinet body installation capacity of the HVC-1100 is 1100 Kvar;

the cabinet body installation capacity of the HVC-800 is 800 Kvar.

Referring to fig. 2A and 2B, preferably, the TSC cabinet 400 includes:

the TSC cabinet 400 has a cabinet mounting capacity of 600 Kvar.

It can be understood that the cabinet body installation capacity is the reactive compensation capacity, the utility model provides a this kind of compensation arrangement's reactive compensation capacity sum is: 1100Kvar +800Kvar +600Kvar ═ 2500 Kvar.

Referring to fig. 2A and 2B, the utility model provides a this kind of compensation arrangement, TSC adopt the angle internal connection method, and controllable silicon is in condenser triangle-shaped's inside, and this connection is pollution-free to the system, and thyristor current quota is little, and only 58% of phase current calorific capacity is little, the heat dissipation is good, and every silicon controlled rectifier is equipped with axial fan alone. When the silicon controlled rectifier is detected to be higher than the program set temperature, the fan is started; when the temperature is reduced to be below a set value, the fan stops running; the boosting transformer in the scheme not only promotes voltage, but also is equivalent to impedance (similar to a reactor) to separate compensation and a high-voltage system, the compensation loop is on the low-voltage side of the transformer and is an independent system, other loads do not exist, harmonic wave influence does not exist, and the service life of the capacitor is greatly prolonged. The transformer has the functions of current limiting, voltage stabilizing, harmonic isolation and the like, and has the function of the reactor, so that the reactor is not required to be additionally arranged in the device, the loss in the reactor is reduced, and the economic benefit is improved.

Note that, the following tables i and ii are explanatory diagrams of the arrangement of the components in fig. 2A and 2B.

Watch 1

Watch two

It can be understood that the utility model provides a this kind of compensation arrangement, HVC + TSC hybrid high pressure idle dynamic compensation device adopt artificial intelligence control, comprise controller, bidirectional thyristor, condenser (taking discharge resistance), step-up transformer, protection component etc.. The controller tracks and measures the power factor and the reactive current of the load in real time, compares the power factor and the reactive current with a preset given value incoming line, and dynamically controls and switches different groups of capacitors so as to ensure that the power factor always meets a set value. The whole measurement execution process is completed in one cycle (time is less than 20ms), the controller ensures that the silicon controlled rectifier triggers at zero crossing, and the switched capacitor has no impact, no inrush current and no transition process. The TSC series silicon controlled dynamic reactive power compensation device can dynamically and quickly track load change and overcome the damage and inherent defects of the traditional reactive power compensator to a capacitor.

According to the field load type, the harmonic generated by the frequency converter is mainly 5 th order harmonic and 7 th order harmonic, the booster transformer separates the compensation from a high-voltage system, the compensation loop is on the low-voltage side of the transformer and is a single system, other loads do not exist, the harmonic is not influenced by the harmonic generated by equipment such as frequency conversion, and meanwhile, the HVC part is provided with a reactor with the reactance rate of 6%, the harmonic interference of 5 th order and 7 th order or more can be effectively inhibited, therefore, the service life of the capacitor can be effectively prolonged, and the compensation effect is improved. In addition, the step-by-step switching of the TSC part is mainly matched with the load of the motor, and the reactive change of the motor in a starting stage and a normal production operation stage is large, so that the compensation part of the low-voltage TSC + booster transformer is energy-saving and well suitable for the working condition of a site, and the compensation forms are grouped in a plurality of groups. The compensation is fine and smooth, and the response time is fast, so that the reactive power of a fine and smooth compensation system is tracked in real time, the possible over-compensation phenomenon of large-capacity grouping of the traditional TSC is well avoided, the compensation is more refined, and the normal work of the system under a higher and stable power factor is ensured in real time.

It can be understood that compared with the traditional high-voltage TSC, the compensation device provided by the utility model has the advantages of finer compensation, better compensation effect and lower cost; the silicon controlled rectifier is used for switching adjustment, the response speed is high, and t is less than 20 ms; zero-crossing switching, no impact, no inrush current and no overvoltage are realized; within the specified dynamic response time, multi-stage compensation is achieved once, and the compensation effect is excellent; the device has a perfect protection function and has overcurrent, overvoltage, undervoltage, temperature protection and the like; the capacitor has long service life and low maintenance rate and reduces maintenance cost because no other equipment or harmonic interference exists; the capacitor bank adopting the equivalent coding mode has the advantages of easy realization of automatic control, easy realization of cyclic switching, smaller switching oscillation, better compensation precision and reliability and average service life of each capacitor, and all the capacitor banks have the same capacity.

Preferably, a liquid crystal display is arranged on the control cabinet.

It should be noted that the utility model provides a this kind of switch board has following characteristics:

1. liquid crystal display: the method comprises the steps of system voltage, system current, PF (cos phi power factor display), Iq (reactive current display) and Ip (active current display);

1. C1-C8 switching path number display can control 8 paths of output main contact points, and 12V voltage is selectable;

2. the switching mode comprises automatic switching and manual switching, the operation is simple, and good man-machine conversation is realized;

4. powerful protection function: the device comprises a capacitance switching indication function, an over-compensation and under-compensation indication function, a voltage upper limit and a voltage lower limit protection function;

5. the content of 1-31 th harmonic can be measured and displayed;

6. the power supply can automatically quit when in external fault or power failure, and automatically recover to operate after power transmission.

Referring to fig. 1 and 3, preferably, the HVC cabinet, the control cabinet, the booster transformer cabinet and the TSC cabinet are installed on a channel steel 500 embedded on the ground and welded on the channel steel 500.

Preferably, the channel steel 500 is embedded in the ground through an embedded part 600 and connected with the ground net.

Preferably, the embedded part 600 is formed by pouring reinforced concrete.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

Claims

1. A hybrid static high-voltage reactive dynamic compensation device, comprising:

2. The apparatus of claim 1,

and the TSC cabinet is connected to the low-voltage side of the boosting transformer through a 0.4kV bus.

3. The apparatus of claim 1,

and the HVC cabinet is connected with the control cabinet through a 10kV bus.

4. The apparatus of claim 1, wherein the HVC cabinet comprises:

HVC-1100 and HVC-800 connected in parallel on the bus bar, wherein,

the cabinet body installation capacity of the HVC-1100 is 1100 Kvar;

the cabinet body installation capacity of the HVC-800 is 800 Kvar.

5. The apparatus of claim 1, wherein the TSC cabinet comprises:

the TSC cabinet body installation capacity is 600 Kvar.

6. The apparatus of claim 1,

and a liquid crystal display is arranged on the control cabinet.

7. The apparatus of claim 6,

the switching mode of the control cabinet comprises automatic switching and manual switching.

8. The apparatus of claim 1,

the HVC cabinet, the control cabinet, the booster transformer cabinet and the TSC cabinet are installed on channel steel pre-buried on the ground and welded on the channel steel.

9. The apparatus of claim 8,

the channel steel is pre-buried on the ground through an embedded part and is connected with a ground net.

10. The apparatus of claim 9,

the embedded part is formed by pouring reinforced concrete.