CN211790775U

CN211790775U - High-voltage hybrid reactive power compensation device

Info

Publication number: CN211790775U
Application number: CN202020456871.5U
Authority: CN
Inventors: 戢卫平; 王锦友; 李夏
Original assignee: Energiedaten Technology Shanghai Co ltd
Current assignee: Energiedaten Technology Shanghai Co ltd
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-10-27
Anticipated expiration: 2030-04-01

Abstract

The utility model discloses a high pressure mixed type reactive power compensator, it is including at least two sets of active type SVG modules and at least two sets of electric capacity module that couple to high-voltage system. Wherein at least two groups of active SVG modules are connected to a step-up transformer in parallel and are connected to a high-voltage system by the step-up transformer; each group of capacitor modules is connected with a high-voltage system through a contactor respectively, and the control output ports of the active SVG modules are connected with the control port contactors on each group of capacitor modules respectively so as to independently control the on and off of each contactor according to voltage signals and current signals.

Description

High-voltage hybrid reactive power compensation device

Technical Field

The utility model relates to a power compensation technical field especially relates to a high pressure mixed type reactive power compensator, and it has the function of active compensation and passive compensation concurrently. The utility model discloses a high pressure mixed type reactive power compensator is particularly useful for high-voltage system.

Background

As an industrial and mining enterprise, the pursuit target is the benefit. The production and utilization of electricity, the improvement of the efficiency of power supply equipment and the quality of power supply become established targets of enterprises. At present, the equipment for controlling reactive power in the power industry is divided into: passive and active types.

The main component of the passive reactive compensation equipment is a power capacitor, and the passive reactive compensation equipment has the advantages of simple structure, easiness in implementation and low manufacturing cost, and has the defects of low system response speed, poor compensation precision and easiness in causing system resonance.

The active reactive compensation equipment mainly comprises new products, namely modern power electronic devices IGBT, modern highly integrated microelectronic chips DSP and FPGA, and has the advantages of flexible modeling, accurate operation, high response speed, high compensation precision, difficulty in resonance and the like; but the overall price is higher than that of the passive type. However, it is obvious that the system is compensated for power only by the active type reactive compensation device, which requires a high cost price.

Aiming at a high-voltage system, the active reactive compensation equipment mostly adopts a linear high-voltage SVG (scalable vector graphics) equipment as shown in figure 1. For the compensation equipment, each power electronic device in the linear high-voltage SVG equipment is a high-voltage power electronic device suitable for a high-voltage environment. The price of high voltage power electronics is relatively high, typically 5-10 times the price of corresponding low voltage power electronics.

Therefore, there is a need for a new type of high-voltage hybrid reactive power compensation device to eliminate the above-mentioned drawbacks of the prior art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that the response speed is slow, the compensation precision is poor in order to solve current passive type reactive compensation equipment system to and the high defect of active reactive compensation equipment price, and provide a high pressure mixed type reactive power compensator who is applicable to high-voltage system.

The utility model discloses a solve above-mentioned technical problem through adopting following technical scheme: the utility model provides a high pressure mixed type reactive power compensator, high pressure mixed type reactive power compensator is including coupling to high-voltage system's at least two sets of active type SVG modules and at least two sets of electric capacity modules, wherein, high-voltage system provides electric power for the load, active type SVG module detects high-voltage system's voltage signal and current signal are in order based on voltage signal with current signal calculates high-voltage system provides required reactive power, and its characteristics lie in:

the at least two groups of active SVG modules are coupled to a transformer in parallel with each other and to the high voltage system by the transformer;

each group of capacitor modules is connected with the high-voltage system through a contactor respectively, and the control output port of the active SVG module is connected with the control port of the contactor on each group of capacitor modules respectively so as to independently control the on-off of each contactor according to the voltage signal and the current signal.

Preferably, the high-voltage hybrid reactive power compensation device further comprises a centralized controller coupled to each of the active SVG modules, wherein the centralized controller is configured to be able to selectively set the number of active SVG modules connected to the high-voltage system.

Preferably, the centralized controller comprises a touch screen.

Preferably, the high-voltage hybrid reactive power compensation device further comprises a high-voltage switch cabinet located between the transformer and the high-voltage system.

Preferably, the high-voltage hybrid reactive power compensation device further comprises a transformer, and the active SVG module is connected with the high-voltage system through the transformer.

Preferably, the high-voltage hybrid reactive power compensation device further comprises a fuse, and the fuse is connected with the outlet end of the capacitor module.

Preferably, at least two groups of capacitor modules have different capacitances.

Preferably, at least one of the at least two sets of capacitive modules comprises three capacitors connected in a star configuration.

Preferably, at least one of the at least two sets of capacitor modules comprises three capacitors connected to each other in a delta connection.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in: according to the utility model discloses an existing passive capacitance compensation's of high pressure mixed type reactive power compensator economic nature, active compensation's quick response, high accuracy and flexibility again. In addition, a plurality of active SVG modules suitable for the low-voltage environment are connected into the step-up transformer in parallel, so that the reactive power is dynamically compensated, and the power is delivered to a high-voltage power grid.

Drawings

FIG. 1 is a schematic structural diagram of a linear high-voltage SVG device in the prior art;

fig. 2 is a schematic structural diagram of a high-voltage hybrid reactive power compensation device according to a preferred embodiment of the present invention.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings, and the following description is exemplary and not intended to limit the present invention, and any other similar cases will fall within the scope of the present invention.

As shown in fig. 2, it shows a high voltage hybrid reactive power compensation device according to a preferred embodiment of the present invention. Referring to fig. 2, the high-voltage hybrid reactive power compensation device includes a plurality of groups of active SVG modules 1 and a plurality of groups of capacitance modules 2, which are respectively coupled in parallel to a system. Wherein the system provides power to a load 10. The active SVG module 1 detects a voltage signal and a current signal of a system and calculates reactive power required by the system based on the voltage signal and the current signal. In one embodiment, the active SVG module 1 can be connected to the system through a transformer 7 to obtain voltage and current signals of the system.

Each set of active SVG modules 1 is coupled to a transformer 3 in parallel with each other, and then coupled to a system by the transformer 3. And each group of capacitor modules 2 in the high-voltage hybrid reactive power compensation device is respectively connected with the system through a contactor 4. The control ports of the contactors 4 on the loops of each group of capacitor modules 2 are connected with the control output port of the active SVG module 1, and the active SVG module 1 controls the on-off of each contactor 4 according to the detected system voltage signal and current signal.

According to the high-voltage hybrid reactive power compensation device in the form, each active SVG module 1 boosts the voltage through the transformer 3 and then provides no power to a power grid system, so that the active SVG module 1 applied to a low-voltage level can connect and provide compensation power for a high-voltage power grid without using expensive chain type high-voltage SVG equipment. Further, according to the detected voltage signal and current signal, the inductive reactive power in the system and the reactive power required to be compensated are calculated, and the high-voltage hybrid reactive power compensation device can correspondingly adjust the number of the capacitor modules 2 connected into the power grid system.

In the embodiment of fig. 2, each active SVG module 1 is set to the same model. The active SVG module 1 for controlling the opening and closing of each contactor 4 can be set to any one of them. In the embodiment where a plurality of active SVG modules 1 are provided, preferably, the high-voltage hybrid reactive power compensation device may be provided with a centralized controller coupled to each active SVG module 1. The centralized controller can detect the active SVG module 1 with faults by comparing the data uploaded by each module, eliminates the detected data, sums and averages the detected data of the remaining active SVG modules 1 as basic data, and outputs control signals for controlling each contactor 4.

A centralized controller such as a touch screen 5 is configured to be able to selectively set the number of active SVG modules 1 accessing the system. By means of the centralized controller, a user can arbitrarily select a corresponding number of active SVG modules 1 to access the power grid system. It should be understood that the number of the active SVG modules 1 accessing the power grid system should be not less than 2, so as to be suitable for the high-voltage system.

Optionally, a high-voltage switchgear cabinet 6 may be provided between the transformer 3 and the high-voltage system.

Optionally, according to the utility model discloses an active SVG module 1 comprises 1 DSP (TMS320F28335) and 1 FPGA (XC2S300E-6PQ208I), on the basis of former active, can expand abundant resource 1 way 485 communication ports, 18 ways delivery outlets with this module, can compatible present required control mode of electric capacity compensation.

To the utility model provides a each group electric capacity module 2, electric capacity can be established to the same or different. The capacitances of the capacitance modules 2 can be set to be the same or different. Preferably, the various capacitive modules 2 are preferably arranged to have different capacitive capacities, thereby achieving a fine tuning.

The capacitors provided in the capacitor module 2 may have different forms, and in the embodiment shown in fig. 2, it may include three capacitors connected to each other in a delta connection; in other embodiments, not shown, the capacitor module 2 may also be a ground star connection consisting of three capacitors connected in series (star connection). It is understood that in another embodiment, a part of the capacitance modules 2 of the high-voltage hybrid reactive power compensation device may be delta-connected capacitance modules 2 as shown in fig. 2, and another part of the capacitance modules 2 is star-connected to the ground by capacitors connected in series with each other. In the embodiment shown in fig. 2, each capacitive module 2 optionally has a capacity of 0.4MVar, 0.5MVar, 0.6 MVar.

The high-voltage hybrid reactive power compensation device can be further provided with a fuse 8. Wherein, fuse 8 is connected with the exit end of capacitor module 2. When the current in the system is too large, the fuse 8 melts the melt to the corresponding capacitor module 2, so that the normal power supply of the power grid system is prevented from being influenced due to the abnormal capacitor module 2.

The working principle of the high-voltage hybrid reactive power compensation device according to the present invention is described below by taking as an example that each capacitor module 2 has the same capacitance and is formed by connecting three capacitors in a delta connection manner.

1. When the reactive gap is less than or equal to 0.5 time of the capacity of a single capacitor module 2, the system does not need to put in the capacitor module 2 any more, and N active SVG modules 1 are used for self-capacitively compensating the reactive gap according to the set proportion, so that the system reaches the target power factor. The reactive power and the like required to be compensated under the conventional condition are preliminarily judged according to the number of devices and the types of the devices accessed to the system where the power grid is located, and the number of the active SVG modules 1 is adaptively set by a designer. As for the ratio of reactive power between the supplies of the active SVG modules 1, it can be understood that it is one dynamic data. For the active SVG module 1 which provides a large proportion of capacitive reactive power at the early stage, the active SVG module can provide a relatively small proportion of capacitive reactive power at the later stage; otherwise, a larger proportion of capacitive reactive power is provided at a later stage.

2. When the reactive gap is larger than 0.5 times of the capacity of the capacitor bank, the system can switch to a group of capacitor modules 2, and at the moment, the over-compensated capacitive reactive power is compensated by the N active SVG modules 1 according to the set proportion and the self-inductive reactive power, so that the system reaches the target power factor.

3. When the load 10 is reduced and the active SVG modules 1 are in inductive reactive power generation, the system will first cut off the capacitor modules 2 that have previously overcompensated capacity (i.e., the capacity of reactive power provided previously), and then adjust the relevant outputs of the N active SVG modules 1 themselves to make the system reach the target power factor.

4. When the load 10 is reduced and the N active SVG modules 1 are in reactive power generation, the system cuts off one or more groups of corresponding capacitor modules 2 close to the over-compensation capacity and one or more active SVG modules 1, and then adjusts the related output to enable the system to reach the target power factor.

It should be noted that the above embodiment is only an alternative embodiment for the convenience of understanding. Based on the utility model discloses a high pressure hybrid reactive power compensator, skilled person in the art can understand, can also implement based on other modes.

Optionally, the grid system is a 10KV grid system.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments can be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications all fall within the scope of the present invention.

Claims

1. The utility model provides a high pressure hybrid reactive power compensator, high pressure hybrid reactive power compensator is including at least two sets of active type SVG modules and at least two sets of capacitance module that couple to high voltage system, wherein, high voltage system provides electric power for the load, active type SVG module detects high voltage system's voltage signal and current signal are in order to be based on voltage signal with current signal provides reactive power to high voltage system, its characterized in that:

the at least two groups of active SVG modules are connected to a step-up transformer in parallel with each other and are connected to the high-voltage system by the step-up transformer;

2. The high-voltage hybrid reactive power compensation device of claim 1, further comprising a centralized controller coupled to each of the active SVG modules, the centralized controller configured to enable selective setting of the number of active SVG modules that are interfaced to the high-voltage system.

3. The high-voltage hybrid reactive compensation device according to claim 2, wherein the centralized controller comprises a touch screen.

4. The high voltage hybrid reactive power compensation device of claim 1, further comprising a high voltage switchgear between the transformer and the high voltage system.

5. The high-voltage hybrid reactive power compensation device of claim 1, further comprising a transformer through which the active SVG module is connected with the high-voltage system.

6. The high-voltage hybrid reactive power compensation device according to claim 1, further comprising a fuse connected to an outlet terminal of the capacitor module.

7. The high-voltage hybrid reactive power compensation device according to any one of claims 1 to 6, wherein at least two groups of the capacitor modules have different capacitances.

8. The high voltage hybrid reactive power compensation device of claim 1, wherein at least one of the at least two sets of capacitive modules comprises three capacitors connected in a star configuration.

9. The high-voltage hybrid reactive power compensation device according to claim 1, wherein at least one of the at least two sets of capacitor modules comprises three capacitors connected to each other in a delta connection.