CN203397849U - Novel controllable electric reactor based on two-phase magnetic material - Google Patents

Abstract

The utility model relates to a novel controllable reactor based on two-phase magnetic materials, which includes an iron core, a winding and a control system. The iron core is composed of ordinary electrical steel sheet and two-phase magnetic material; the winding is composed of main winding and control winding; the control system is composed of reactor, IGBT, transformer, CPU, voltage/current detection, drive and capacitor connected to the grid. The reactive component is sent to the control system through the transformer, and the control system sends a DC current to the control winding to generate the reactive component required by the power system for compensation. Reducing the loss of the power system, the energy saving effect is obvious, and certain economic benefits have been achieved, which is of great practical significance to the entire power system.

Description

A new controllable reactor based on two-phase magnetic material

technical field

The utility model relates to the field of electrical engineering, and specifically refers to a controllable reactor capable of adaptively compensating reactive current of a power grid and controlling harmonic current by using two-phase magnetic materials, and having the characteristics of energy saving and intelligence.

Background technique

In recent years, with the development of ultra-high voltage long-distance transmission system and the intensification of power load changes, the consumption of reactive power in the power grid is increasing day by day. The energy crisis has spread all over the world. Developing, saving energy and improving the quality of power supply have become the main tasks of all countries. Insufficient reactive power is an important factor leading to low power quality and serious waste of power in our country.

Theory and practice show that adjusting the reactance has a significant effect on improving the operation performance of the power system, especially the application of the controllable reactor, whose capacity will automatically change with the size of the transmitted power, preventing the occurrence of The excessively high operating overvoltage and the corresponding transient oscillation overvoltage can reduce the loss of the power grid, improve the transmission energy, stability and reliability of the power system of the power system.

In 1965, the British General Electric Company manufactured the world's first controllable reactor. From 1977 to 1978, American GE Company, Westinghouse Company and ABB Company successively developed static compensation devices controlled by thyristors and ultra-high voltage TCT static compensation devices. , Thyristor controlled reactor. In 1986, the former Soviet Union proposed a new controllable reactor structure, which made breakthroughs in DC saturated controllable reactors and greatly improved the performance of the reactors. Subsequently, researchers in Japan proposed a controllable reactor with an orthogonal core based on the principle of controlling the magnetic flux. In recent years, research on controllable reactors by foreign scholars and scientific research institutions has achieved results in many aspects, such as controllable reactors based on PWM control, transformer-type controllable reactors based on controllable load principles, and flux control-based reactors. The principle of orthogonal core type controllable reactor, superconducting controllable reactor, etc. Domestic research on controllable reactors mainly focuses on DC controllable reactors and AC controllable reactors. Wuhan University, Shanghai Jiaotong University, North China Electric Power University, Zhejiang University, Huazhong University of Science and Technology, Shenyang University of Technology, etc. have carried out systematic research on DC and AC controllable reactors. Successfully developed auto-tuning arc suppression coils based on magnetic valve controllable reactors, dynamic reactive power compensation controllable reactors for electrified railways, and million-volt UHV controllable reactors.

At the present stage, the research hotspots on reactive power compensation and harmonic control devices mainly focus on controllable reactors, capacitors, active filters and their combinations. The main problem of general reactors in power systems is that the capacity cannot be adjusted. Traditional controllable reactors can solve the problem of capacity adjustment, but they have the disadvantages of slow response speed and poor continuous controllability, and cannot well meet the needs of dynamic reactive power compensation. The structure of the active filter is relatively complex, and its working reliability and ability to resist the impact of the power grid are relatively weak. If an effective structural system is established inside the controllable reactor, a new type of two-phase magnetic material is used to realize real-time and continuous adjustment of the reactance. It will be possible to fundamentally solve a series of problems of traditional controllable reactors and ensure the safe operation of the power system.

Contents of the invention

Purpose of the invention:

The utility model provides a new type of controllable reactor based on two-phase magnetic materials. A new type of two-phase magnetic material is used to form a new controllable reactor core structure. The purpose is to: establish a detection and control system Realize the intelligent conversion between the demagnetization and DC excitation functions of the two-phase magnetic material, complete the real-time and continuous adjustment of the reactance of the controllable reactor, and then realize the reactive power compensation and harmonic suppression of the power system.

Technical solutions:

The utility model is implemented through the following technical solutions:

A new type of controllable reactor based on two-phase magnetic materials, the controllable reactor includes an iron core, a winding and a control system; it is characterized in that the iron core is composed of ordinary electrical steel sheets and two-phase magnetic materials, and the two-phase magnetic materials are set In the core column of ordinary electrical steel sheet, the upper yoke, lower yoke, first side column and second side column of ordinary electrical steel sheet are the main magnetic circuit; the winding is composed of main winding and control winding, and the main winding is wound on On the main magnetic circuit, the control winding is wound on both sides of the two-phase magnetic material; the control system is connected with the control winding.

The control system is composed of reactor, IGBT, transformer, CPU, voltage and current detection device, drive and capacitor connected to the power grid.

Advantages and effects:

The utility model is different from the traditional controllable reactor scheme.

First of all, using two-phase magnetic materials to adjust the reactance has a significant energy-saving effect; secondly, using two-phase magnetic materials to adjust the reactance in real time and continuously produces fewer harmonics, and only needs a small DC to generate a strong adjustable magnetic flux, and It can realize power failure compensation and ensure the safe operation of the power system.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Explanation of reference signs:

1. Ordinary electrical steel sheet, 2. Two-phase magnetic material, 3. Upper yoke, 4. Lower yoke, 5. First side column, 6. Second side column, 7. Main magnetic circuit, 8. Main winding, 9 , control winding, 10, control system, 11, power grid, 12, reactor, 13, IGBT, 14, transformer, 15, CPU, 16, voltage and current detection device, 17, drive, 18, capacitor.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is described in detail:

The utility model provides a brand-new controllable reactor, and two-phase magnetic materials are implanted into the traditional controllable reactor to form a new controllable reactor which uses material residual magnetism to adjust the reactance. Through the establishment of a detection and control system, the continuous adjustment of the DC excitation function of the two-phase magnetic material is realized, and the real-time, continuous and smooth adjustment of the reactance is completed. This new type of controllable reactor cancels the way that the original reactor introduces the current regulation reactance from the external circuit. For reactive power compensation in power systems, the new controllable reactor based on two-phase magnetic materials has the characteristics of using the residual magnetism of the material to adjust the reactance itself, which can realize power-off regulation and ensure the safe operation of the power system.

A new type of controllable reactor based on two-phase magnetic materials, the controllable reactor includes an iron core, a winding and a control system; it is characterized in that the iron core is composed of ordinary electrical steel sheets 1 and two-phase magnetic materials 2, and the two-phase magnetic The material 2 is set in the core column of the ordinary electrical steel sheet 1, the upper part of the ordinary electrical steel sheet 1 is the upper yoke 3, the lower part is the lower yoke 4, the left side is the first side column 5, and the right side is the second side column 6 , the upper yoke 3, the lower yoke 4, the first side column 5, and the second side column 6 of the ordinary electrical steel sheet 1 are the main magnetic circuit 7; the winding is composed of the main winding 8 and the control winding 9, and the main winding 8 is wound on the main On the magnetic circuit 7 , the control winding 9 is wound on both sides of the two-phase magnetic material 2 ; the control system 10 is connected with the control winding 9 .

The control system 10 is composed of a reactor 12 connected to the grid 11 , an IGBT 13 , a transformer 14 , a CPU 15 , a voltage and current detection device 16 , a drive 17 and a capacitor 18 .

The reactor 12 is connected to the IGBT13, the transformer 14 is connected to the main winding 8, the IGBT13 is also connected to the driver 17, the driver 17 is connected to the voltage and current detection device 16, the voltage and current detection device 16 is connected to the CPU15, and the capacitor 18 is connected in parallel to the IGBT13 close to the control winding 9 side.

The working principle of the novel controllable reactor based on the two-phase magnetic material of the utility model is as follows:

When the power system needs reactive power compensation, the reactive component is sent to the control system 10 through the transformer 14, and the control system 10 sends a DC current to the control winding to generate the reactive component required by the power system for compensation. When the power system requires reactive power changes, the reactive component is sent to the control system 10 through the transformer 14, and the capacitor 18 and the control winding 9 in the control system 10 form an RLC oscillator to demagnetize the two-phase magnetic material 2.

Conclusion: This new type of controllable reactor based on two-phase magnetic materials in this utility model can realize the conversion between DC excitation and demagnetization functions of two-phase magnetic materials through the establishment of transformers to detect reactive components, and complete the control system. Reactive power compensation and harmonic suppression of power system. Reducing the loss of the power system, the energy saving effect is obvious, and certain economic benefits have been achieved, which is of great practical significance to the entire power system.

Claims (2)

1. A new type of controllable reactor based on two-phase magnetic materials, the controllable reactor includes iron core, winding and control system; it is characterized in that: the iron core is made of ordinary electrical steel sheet (1) and two-phase magnetic material (2 ), the two-phase magnetic material (2) is set in the core column of the ordinary electrical steel sheet (1), the upper yoke (3), the lower yoke (4) and the first side column ( 5), the second side column (6) is the main magnetic circuit (7); the winding is composed of the main winding (8) and the control winding (9), the main winding (8) is wound on the main magnetic circuit (7), and the control The winding (9) is wound on both sides of the two-phase magnetic material (2); the control system (10) is connected with the control winding (9). 2. The new controllable reactor based on two-phase magnetic material according to claim 1, characterized in that: the control system (10) is composed of a reactor (12) connected to the grid (11), an IGBT (13) , a transformer (14), a CPU (15), a voltage and current detection device (16), a drive (17), and a capacitor (18).

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