New energy power supply centralized control system

Abstract

The utility model relates to a new energy power supply centralized control system, which comprises a rectifier and rectifier transformers, each rectifier transformer is connected with 2n rectifier modules, each rectifier module is connected with an electrolytic bath, each rectifier transformer consists of a primary side winding and 2n winding parts forming a secondary side winding, each winding part consists of an angle connection winding and a star connection winding; the rectification module comprises two parallel three-phase bridge rectifiers; and one angle connection winding and one star connection winding in the secondary side winding are respectively connected with the two parallel three-phase bridge rectifiers. Compared with the prior art, the utility model has the advantages of harmonic wave reduction and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy power supplies, in particular to a new energy power supply centralized control system. Background Art

[0002] With the rapid development of new energy power supply technology, the scale and importance of the industry are gradually increasing. As an important part of the new energy industry, the efficiency and control management level of new energy power supply are directly related to the development of the entire industry. At present, there are technical bottlenecks in the control of traditional new energy power supply, such as poor flexibility, low communication efficiency, high maintenance cost, and high comprehensive energy consumption.

[0003] The current new energy power supply system generally uses a corner-star winding as a transformer, which can form a 12-pulse rectifier system. However, the corner-star winding still cannot filter out higher-order harmonics well and cannot eliminate harmonic pollution. Utility Model Content

[0004] The purpose of the utility model is to provide a new energy power supply centralized control system in order to filter out higher order harmonics.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A new energy power centralized control system, the system includes a rectifier and a rectifier transformer, each rectifier transformer is connected to 2n rectifier modules, each rectifier module is connected to an electrolytic cell, wherein the rectifier transformer is composed of a primary side winding and 2n winding parts constituting a secondary side winding, each winding part is composed of a delta-connected winding and a star-connected winding;

[0007] The rectifier module comprises two parallel three-phase bridge rectifiers, and a delta-connected winding and a star-connected winding in the secondary winding are respectively connected to the two parallel three-phase bridge rectifiers.

[0008] Furthermore, each rectifier transformer is connected to two rectifier modules, and the secondary winding of the rectifier transformer is composed of two winding parts, namely a first winding part and a second winding part, wherein the first winding part is composed of a first delta-connected winding and a first star-connected winding, and the second winding part is composed of a second delta-connected winding and a second star-connected winding, and there are two electrolytic cells, namely a first electrolytic cell and a second electrolytic cell.

[0009] Furthermore, the two rectifier modules are respectively a first rectifier module and a second rectifier module. The first rectifier module is a three-phase bridge rectifier H1 and a three-phase bridge rectifier H2 connected in parallel, and the second rectifier module is a three-phase bridge rectifier H3 and a three-phase bridge rectifier H4 connected in parallel.

[0010] Furthermore, the three-phase bridge rectifier is a three-phase full-bridge rectifier circuit.

[0011] Furthermore, winding A1, winding B1 and winding C1 of the first delta-connected winding are connected to the three-phase bridge rectifier H1, winding A2, winding B2 and winding C2 of the first star-connected winding are connected to the three-phase bridge rectifier H2, winding A3, winding B3 and winding C3 of the second delta-connected winding are connected to the three-phase bridge rectifier H3, and winding A4, winding B4 and winding C4 of the second star-connected winding are connected to the three-phase bridge rectifier H4.

[0012] Further, the negative pole of the three-phase bridge rectifier H1 is connected to the negative pole of the three-phase bridge rectifier H2, the positive pole of the three-phase bridge rectifier H1 is connected to the positive pole of the three-phase bridge rectifier H2, the positive pole of the three-phase bridge rectifier H1 is connected to the positive pole of the first electrolytic cell, and the negative pole of the three-phase bridge rectifier H2 is connected to the negative pole of the first electrolytic cell.

[0013] Further, the negative pole of the three-phase bridge rectifier H3 is connected to the negative pole of the three-phase bridge rectifier H4, the positive pole of the three-phase bridge rectifier H3 is connected to the positive pole of the three-phase bridge rectifier H4, the positive pole of the three-phase bridge rectifier H3 is connected to the positive pole of the second electrolytic cell, and the negative pole of the three-phase bridge rectifier H4 is connected to the negative pole of the second electrolytic cell.

[0014] Further, the primary winding is a delta-connected winding;

[0015] The primary side of the rectifier transformer is connected to an AC power source, and the AC power source is a three-phase AC power source.

[0016] Furthermore, n is a positive integer ≥1.

[0017] The utility model also proposes an application of the above-mentioned new energy power centralized control system in a hydrogen production system.

[0018] The electrolyzer connected to the centralized control system of new energy power supply is used to produce hydrogen.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model directly sets the secondary winding of the rectifier transformer to an even-numbered multiple of the corner-star winding. The rectifier module includes two parallel three-phase bridge rectifiers. Every two windings are connected to a rectifier module. Each rectifier module can be configured with a 12-pulse rectifier circuit, which is equivalent to 24 pulses. The harmonic pollution to the power grid can be effectively reduced and higher-order harmonics can be filtered out. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a structural schematic diagram of an embodiment of the utility model;

[0023] Figure 3 This is a connection diagram of the transformer, rectifier and electrolytic cell of the utility model. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0027] The utility model proposes a new energy power centralized control system, the structure diagram of the system is as follows Figure 1 As shown. The system includes a rectifier and a rectifier transformer, each rectifier transformer is connected to 2n rectifier modules, each rectifier module is connected to an electrolytic cell, wherein the rectifier transformer is composed of a primary winding and 2n winding parts constituting a secondary winding, each winding part is composed of a delta-connected winding and a star-connected winding; the rectifier module includes two parallel three-phase bridge rectifiers, and a delta-connected winding and a star-connected winding in the secondary winding are respectively connected to the two parallel three-phase bridge rectifiers.

[0028] Taking each rectifier transformer connected to two rectifier modules as an example, the connection diagram of the transformer, rectifier and electrolyzer is as follows: Figure 3 As shown. The secondary winding of the rectifier transformer consists of two winding parts, namely the first winding part and the second winding part, wherein the first winding part consists of a first delta-connected winding and a first star-connected winding, and the second winding part consists of a second delta-connected winding and a second star-connected winding, and there are two electrolytic cells, namely the first electrolytic cell and the second electrolytic cell.

[0029] The two rectifier modules are respectively a first rectifier module and a second rectifier module. The first rectifier module is a three-phase bridge rectifier H1 and a three-phase bridge rectifier H2 connected in parallel, and the second rectifier module is a three-phase bridge rectifier H3 and a three-phase bridge rectifier H4 connected in parallel. The three-phase bridge rectifier is a three-phase full-bridge rectifier circuit.

[0030] Winding A1, winding B1 and winding C1 of the first delta-connected winding are connected to the three-phase bridge rectifier H1, winding A2, winding B2 and winding C2 of the first star-connected winding are connected to the three-phase bridge rectifier H2, winding A3, winding B3 and winding C3 of the second delta-connected winding are connected to the three-phase bridge rectifier H3, and winding A4, winding B4 and winding C4 of the second star-connected winding are connected to the three-phase bridge rectifier H4.

[0031] The negative pole of the three-phase bridge rectifier H1 is connected to the negative pole of the three-phase bridge rectifier H2, the positive pole of the three-phase bridge rectifier H1 is connected to the positive pole of the three-phase bridge rectifier H2, the positive pole of the three-phase bridge rectifier H1 is connected to the positive pole of the first electrolytic cell, and the negative pole of the three-phase bridge rectifier H2 is connected to the negative pole of the first electrolytic cell.

[0032] The negative pole of the three-phase bridge rectifier H3 is connected to the negative pole of the three-phase bridge rectifier H4, the positive pole of the three-phase bridge rectifier H3 is connected to the positive pole of the three-phase bridge rectifier H4, the positive pole of the three-phase bridge rectifier H3 is connected to the positive pole of the second electrolytic cell, and the negative pole of the three-phase bridge rectifier H4 is connected to the negative pole of the second electrolytic cell.

[0033] The primary winding is a delta-connected winding. The primary winding is connected to an AC power source, which is a three-phase AC power source. n is a positive integer ≥ 1. n can be 1, 2, and other natural numbers. If n = 2, each rectifier transformer is connected to 4 rectifier modules. The system structure diagram at this time is as follows: Figure 2 As shown, a rectifier transformer has 8 windings on the secondary side, with every two windings connected to a rectifier module, and each rectifier module connected to an electrolytic cell. The primary side of the system can have a delta-connected winding for every four corners, or the 8 windings can share one primary side delta-connected winding.

[0034] The primary side of the rectifier transformer of the utility model is connected to a green power booster station such as a wind power or photovoltaic power plant, and the secondary side includes four windings or eight windings. In order to improve the system power factor and harmonics, every two windings are connected to a rectifier module, and each rectifier module is configured with a 12-pulse rectifier circuit. Two or four groups of rectifiers constitute an overall 24-pulse rectifier system, which can effectively reduce the harmonic pollution to the power grid.

[0035] When the utility model is working, the rectifier transformer transforms the AC voltage, the secondary winding of the transformer inputs the voltage into the rectifier module for rectification, and then outputs it to the electrolytic cell for hydrogen production.

[0036] The utility model directly sets the secondary winding of the rectifier transformer to an even-numbered multiple of the corner-star winding. The rectifier module includes two parallel three-phase bridge rectifiers. Every two windings are connected to a rectifier module. Each rectifier module can be configured with a 12-pulse rectifier circuit, which is equivalent to 24 pulses. The harmonic pollution to the power grid can be effectively reduced and higher-order harmonics can be filtered out.

[0037] The power supply control system of the utility model can be applied to the technical fields of hydrogen production / aluminum electrolysis, etc. The series-connected three-phase rectifier bridge of the utility model can better control the current and voltage and improve the stability.

[0038] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A new energy power centralized control system, characterized in that: The system includes a rectifier and a rectifier transformer, each rectifier transformer is connected to 2n rectifier modules, each rectifier module is connected to an electrolytic cell, wherein the rectifier transformer is composed of a primary side winding and 2n winding parts constituting a secondary side winding, each winding part is composed of a delta-connected winding and a star-connected winding; The rectifier module comprises two parallel three-phase bridge rectifiers, and a delta-connected winding and a star-connected winding in the secondary winding are respectively connected to the two parallel three-phase bridge rectifiers.

2. A new energy power centralized control system according to claim 1, characterized in that: Each rectifier transformer is connected to two rectifier modules. The secondary winding of the rectifier transformer consists of two winding parts, namely a first winding part and a second winding part. The first winding part consists of a first delta-connected winding and a first star-connected winding, and the second winding part consists of a second delta-connected winding and a second star-connected winding. There are two electrolytic cells, namely a first electrolytic cell and a second electrolytic cell.

3. A new energy power centralized control system according to claim 2, characterized in that: The two rectifier modules are respectively a first rectifier module and a second rectifier module. The first rectifier module is a three-phase bridge rectifier H1 and a three-phase bridge rectifier H2 connected in parallel, and the second rectifier module is a three-phase bridge rectifier H3 and a three-phase bridge rectifier H4 connected in parallel.

4. A new energy power centralized control system according to claim 3, characterized in that: The three-phase bridge rectifier is a three-phase full-bridge rectifier circuit.

5. A new energy power centralized control system according to claim 3, characterized in that: Winding A1, winding B1 and winding C1 of the first delta-connected winding are connected to the three-phase bridge rectifier H1, winding A2, winding B2 and winding C2 of the first star-connected winding are connected to the three-phase bridge rectifier H2, winding A3, winding B3 and winding C3 of the second delta-connected winding are connected to the three-phase bridge rectifier H3, and winding A4, winding B4 and winding C4 of the second star-connected winding are connected to the three-phase bridge rectifier H4.

6. A new energy power centralized control system according to claim 5, characterized in that: The negative pole of the three-phase bridge rectifier H1 is connected to the negative pole of the three-phase bridge rectifier H2, the positive pole of the three-phase bridge rectifier H1 is connected to the positive pole of the three-phase bridge rectifier H2, the positive pole of the three-phase bridge rectifier H1 is connected to the positive pole of the first electrolytic cell, and the negative pole of the three-phase bridge rectifier H2 is connected to the negative pole of the first electrolytic cell.

7. A new energy power centralized control system according to claim 6, characterized in that: The negative pole of the three-phase bridge rectifier H3 is connected to the negative pole of the three-phase bridge rectifier H4, the positive pole of the three-phase bridge rectifier H3 is connected to the positive pole of the three-phase bridge rectifier H4, the positive pole of the three-phase bridge rectifier H3 is connected to the positive pole of the second electrolytic cell, and the negative pole of the three-phase bridge rectifier H4 is connected to the negative pole of the second electrolytic cell.

8. A new energy power centralized control system according to claim 1, characterized in that: The primary winding is a delta-connected winding; The primary side of the rectifier transformer is connected to an AC power source, and the AC power source is a three-phase AC power source.

9. A new energy power centralized control system according to claim 8, characterized in that: n is a positive integer ≥1.

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