APT hybrid filter for 10KV power grid
By designing APT hybrid filters for 10KV power grids, including series capacitors and reactors, to form an adjustable LC filter, the problem of insufficient transportation space occupation and fault regulation capabilities of traditional filters is solved, and equipment capacity and cost are achieved savings and reliability improvements.
Patent Information
- Application Number
- CN202421003739.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-10
AI Technical Summary
Traditional APT hybrid filter bracket or seat design for 10KV grids causes transportation and packaging to occupy a lot of space, increasing transportation and packaging costs, and existing filters face harmonic overload, overcurrent, short circuit and other faults. Inability to adjust effectively, affecting the reliability of the equipment.
Design an APT hybrid filter including a series capacitor C5 and a reactor L5 to form an LC filter, preferably a fifth harmonic filter, and the current source IAPFN is a low-voltage APF harmonic current generator, which can adjust the reactance to satisfy the Multiple harmonic filtering requirements reduce equipment capacity and cost.
It realizes the savings of equipment capacity and cost, improves the reliability of the equipment and the adjustment ability of filtering rate, and avoids the occurrence of faults such as harmonic overload.
Smart Images
Figure CN222283216U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of circuit filtering, in particular to an APT hybrid filter used for a 10KV power grid. Background Art
[0002] The APT hybrid filter for 10KV power grid is one of the favorite activities for children. Its overall structure is also quite diverse. The traditional ones in schools, parks, communities and other places are fixed and do not need to be disassembled. However, APT hybrid filters for 10KV power grids are also commonly installed in homes nowadays. Families generally purchase APT hybrid filters for 10KV power grids through online platforms, so merchants need to put forward higher requirements for the transportation compression space of the products, so as to save transportation costs and packaging costs. The traditional APT hybrid filter bracket or seat for 10KV power grid is a joint or semi-joined type, and the packaging takes up a lot of length and width space.
[0003] Therefore, the inventors have modified the structure of the APT hybrid filter used in the 10KV power grid. Utility Model Content
[0004] In view of the above technical problems in the related art, the utility model proposes an APT hybrid filter for a 10KV power grid, which can overcome the above deficiencies of the prior art.
[0005] In order to achieve the above technical purpose, the technical solution of the utility model is implemented as follows:
[0006] An APT hybrid filter for a 10KV power grid includes a capacitor C5 and a reactor L5 connected in series, one end of the capacitor C5 is connected to a power supply U A The output end is connected and the other end is connected to one end of the reactor L5, the other end of the reactor L5 is grounded, and the reactor L5 is connected in parallel with a current source I APFN , the current source I APFN One end is connected to the line between the capacitor C5 and the reactor L5 and the other end is grounded.
[0007] Furthermore, the capacitor C5 and the reactor L5 together form an LC filter.
[0008] Furthermore, the frequency of the LC filter is fixed.
[0009] Furthermore, the LC filter is preferably a 5th harmonic filter.
[0010] Furthermore, the reactor L5 is preferably a fifth harmonic reactor.
[0011] Furthermore, the capacitor C5 is preferably a 5th harmonic capacitor.
[0012] Furthermore, the current source I APFN A low voltage APF harmonic current generator is preferred.
[0013] Beneficial effects of the utility model: This product greatly reduces the equipment capacity. In the past, multiple filters were required. Generally, a 10KV system needs to be equipped with 5, 7, 11, and 13 filters. With this system, only one 5th order filter is required, which can meet the requirements of filtering out 5th, 7th, 11th, and 13th order harmonics. Therefore, the equipment cost and equipment floor space are greatly saved.
[0014] This product also has certain benefits in improving performance. The original filter calculated the zero impedance for the harmonics to be filtered out during design. The problem is that zero impedance cannot prevent the inflow of harmonics. Therefore, if the design quantity is too small or the on-site load is increased during design, as many harmonics as there are in the system will flow into the system, which may cause overload, overcurrent, short circuit and other faults in the filter system. After using the design in this patent, we can change the voltage frequency of L5 by changing the frequency of IAPFN, so the adjustment from the original zero impedance to the current small impedance and large impedance can be made. After adjustment, the overload, overcurrent, short circuit and other faults of the existing filter caused by excessive harmonic current can be avoided. This product greatly improves the reliability of the equipment, and the filtering rate can be adjusted according to the standard. The traditional solution cannot adjust the filtering rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The utility model is a circuit diagram of an APT hybrid filter for a 10KV power grid. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0017] like Figure 1 As shown, in order to facilitate understanding of the above technical solution of the present invention, the above technical solution of the present invention is described in detail below through specific usage methods.
[0018] In specific use, the APT hybrid filter for 10KV power grid includes a capacitor C5 and a reactor L5 connected in series. One end of the capacitor C5 is connected to the power supply U A The output end is connected and the other end is connected to one end of the reactor L5, the other end of the reactor L5 is grounded, and the reactor L5 is connected in parallel with a current source I APFN , the current source IAPFN One end is connected to the line between the capacitor C5 and the reactor L5 and the other end is grounded.
[0019] In a specific embodiment, the capacitor C5 and the reactor L5 together form an LC filter.
[0020] In a specific embodiment, the LC filter has a fixed frequency.
[0021] In a specific embodiment, the LC filter is preferably a 5th harmonic filter.
[0022] In a specific embodiment, the reactor L5 is preferably a 5th harmonic reactor.
[0023] In a specific embodiment, the capacitor C5 is preferably a 5th harmonic capacitor.
[0024] In a specific embodiment, the current source I APFN A low voltage APF harmonic current generator is preferred.
[0025] Specific working principle: I HN is the Nth harmonic current generated by the load; the current source I APFN It is a low voltage APF harmonic current generator, which can generate corresponding Nth harmonic current.
[0026] The 5th order filter is composed of C5L5 in series. It can filter out the 5th harmonic very well, but it cannot filter out the 7th, 11th, and 13th harmonics according to national standards.
[0027] The voltage drop caused by the Nth harmonic current IHN flowing into capacitor C5 The harmonic current I flowing into the reactor L5 HN -I APFN The resulting pressure drop is 314L5N(I HN -I APFN ).
[0028] As long as both
[0029] It can form zero impedance to the Nth harmonic and filter out the 7th, 11th, and 13th harmonics. Obviously, the 5th filter K5=0, APF does not need to emit 5th harmonic. In most field situations, APF capacity is only 10% of 5th filter capacity. This product is designed to deal with 5th harmonic. Since the fundamental voltage drop of the reactor is 4% (231V) of the rated voltage of the grid 5774V, it is suitable for low voltage and small capacity to control high voltage and large capacity.
[0030] In summary, with the help of the above technical solution, this product greatly reduces the equipment capacity. Because it used to be composed of multiple filters, the general 10KV system needs to be configured with 5, 7, 11, and 13 filters. With this system, only a 5th filter is needed, which can meet the requirements of filtering out 5th, 7th, 11th, and 13th harmonics, thus greatly saving equipment costs and equipment floor space.
[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An APT hybrid filter for a 10KV power grid, characterized in that: It includes a capacitor C5 and a reactor L5 connected in series, one end of the capacitor C5 is connected to the power supply U A The output end is connected and the other end is connected to one end of the reactor L5, the other end of the reactor L5 is grounded, and the reactor L5 is connected in parallel with a current source I APFN , the current source I APFN One end is connected to the line between the capacitor C5 and the reactor L5 and the other end is grounded.
2. The APT hybrid filter according to claim 1, characterized in that: The capacitor C5 and the reactor L5 together form an LC filter.
3. The APT hybrid filter according to claim 2, characterized in that: The LC filter frequency is fixed.
4. The APT hybrid filter according to claim 2, characterized in that: The LC filter is a fifth harmonic filter.
5. The APT hybrid filter according to claim 1, characterized in that: The reactor L5 is a fifth harmonic reactor.
6. The APT hybrid filter according to claim 1, characterized in that: The capacitor C5 is a fifth harmonic capacitor.
7. The APT hybrid filter according to claim 1, characterized in that: The current source I APFN It is a low voltage APF harmonic current generator.