Low voltage line voltage optimization circuit

Abstract

The utility model relates to a low -voltage line voltage optimization circuit, the present application sets up the compensation transformer T1 with different gear contacts of the gear winding, the gear winding of compensation transformer T1 supports and is coupled between voltage input end Li and zero line N according to different gear, the compensation winding of compensation transformer T1 is controlled and coupled between voltage input end Li and voltage output end Lo when needing voltage regulation, in the present application, voltage of voltage input end Li and voltage output end Lo is collected to voltage regulating controller PCB, voltage regulating controller PCB drives and connects a plurality of gear control thyristor modules for adjusting the gear winding gear, voltage regulating controller PCB drive connection is used for adjusting four mode control thyristor modules of compensation winding state, voltage regulating controller PCB is electrically connected first current transformer TA1, and first current transformer TA1 sets up in the power supply wire L, and the current of power supply wire L is collected.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage line voltage optimization technology, and in particular to a low-voltage line voltage optimization circuit. Background Technology

[0002] With rapid societal development, the scale of low-voltage power distribution systems is continuously expanding. Low voltage in these systems leads to inconvenience for users. Simultaneously, the widespread integration of photovoltaic (PV) systems increases the output voltage and current of PV modules under high sunlight intensity, potentially causing system voltage rise. Insufficient grid load absorption capacity further contributes to voltage spikes, impacting the voltage quality of low-voltage distribution systems. Low voltage has a significant impact on users' electrical equipment and is one of the most difficult power quality problems to manage in distribution systems. The poor power quality caused by low voltage has attracted the attention of both electricity users and grid companies. While grid companies have undertaken extensive management and prevention efforts for low voltage in distribution networks, the problem remains unresolved. Therefore, effectively managing low voltage in low-voltage distribution systems is exceptionally important and necessary. Thus, a scientific and rational solution to the low-voltage problem in low-voltage distribution systems is crucial. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides a low-voltage line voltage optimization circuit.

[0004] This utility model provides a low-voltage line voltage optimization circuit, including: The adjusting winding of the compensation transformer T1 has different range contacts. The adjusting winding of the compensation transformer T1 supports coupling between the voltage input terminal Li and the neutral line N at different ranges. When voltage adjustment is required, the compensation winding of the compensation transformer T1 is controlled to couple between the voltage input terminal Li and the voltage output terminal Lo. The voltage regulator controller PCB acquires the voltage at the voltage input terminal Li and the voltage output terminal Lo. The voltage regulator controller PCB drives and connects to several gear-adjusting control thyristor modules for adjusting the gear position of the gear-adjusting winding. The voltage regulator controller PCB also drives and connects to four mode control thyristor modules for adjusting the state of the compensation winding. The voltage regulator controller PCB is electrically connected to the first current transformer TA1, which is located on the power supply line L and collects the current of the power supply line L.

[0005] Furthermore, any type of thyristor module contains anti-parallel thyristors to adapt to AC positive and negative half-cycle conduction.

[0006] Furthermore, the voltage regulator PCB is electrically connected to the second current transformer TA2, which is located on the neutral line N to collect the current of the neutral line N. A circuit breaker QF2 is installed on the neutral line.

[0007] Furthermore, the power supply input and output, as well as the neutral wire, are separated by the main circuit breaker QF1.

[0008] Furthermore, the voltage regulator controller PCB drives and connects mode control thyristor module VT1, mode control thyristor module VT2, mode control thyristor module VT3 and mode control thyristor module VT4. One end of both mode control thyristor modules VT1 and VT4 is connected to the voltage input terminal Li, and the other end of both mode control thyristor modules VT1 and VT4 is connected to the two ends of the compensation winding, respectively; one end of both mode control thyristor modules VT2 and VT3 is connected to the voltage output terminal Lo, and the other end of both mode control thyristor modules VT2 and VT3 is connected to the two ends of the compensation winding, respectively.

[0009] Furthermore, one end of each of the different gear-shifting control thyristor modules is connected to different gear-shifting contacts of the gear-shifting winding of the compensation transformer T1, and the other end of each gear-shifting control thyristor module is electrically connected to the neutral line via a master control thyristor module VT9; the master control thyristor module VT9 is connected in parallel with a gear-shifting transition resistor.

[0010] Furthermore, in the three-phase power supply line, the voltage regulator PCB is connected to the main controller, and the main controller is connected to circuit breakers QF3 and QF4 installed in the three-phase power supply line.

[0011] Furthermore, several capacitor filter circuits are installed between the three-phase power supply line and the neutral line.

[0012] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art: This invention enables the control mode to couple the compensation winding of the compensation transformer between the voltage input terminal Li and the voltage output terminal Lo when voltage regulation is required. This superimposes the compensation winding voltage onto the input voltage to increase the output voltage Lo. Conversely, the control mode decouples the compensation winding from Li and Lo. Furthermore, the voltage of the compensation winding is changed by controlling the tap position of the compensation transformer T1. This effectively ensures the voltage qualification rate of the output terminal Lo without generating harmonics during operation. It provides a safe, reliable, economical, and convenient comprehensive solution for distribution lines with unstable power quality and low voltage, offering users a stable and reliable power experience. This invention solves the low-voltage problem in low-voltage power distribution systems. This application is plug-and-play in power supply lines, easy to set up, and supports convenient management and modification of low-voltage problems in low-voltage power distribution systems, ensuring that the voltage at the end of the line meets the actual needs of users. This reduces the workload of staff while ensuring the stable operation of the power system.

[0013] The low-voltage line voltage optimization circuit was developed to address low voltage issues arising from weak system foundations, large power supply radii, and unstable loads. During voltage regulation, the main circuit breaker, mode control thyristor module, and compensation winding bear the load current of the line. The compensation current of the tap-adjustment control thyristor module, the main control thyristor module VT9, and the voltage regulating winding is significantly lower than the load current, greatly improving the safety and reliability of the voltage regulation process. Furthermore, the use of synchronous zero-crossing switching technology further extends the service life of the thyristor module and avoids the frequent burnout failures of the voltage regulating contactor, similar to autotransformer boost voltage regulators. The low-voltage line voltage optimization circuit features excellent voltage boosting effect, small size, low power consumption, convenient installation and maintenance, long service life, and high safety and reliability. It can stably boost the voltage at the end of low-voltage power distribution systems, ensuring normal power supply to users, making it an ideal device for solving the problem of low voltage in long-distance power supply in low-voltage power distribution systems. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1A schematic diagram of a low-voltage line voltage optimization circuit provided for an embodiment of this utility model; Figure 2 This is a schematic diagram of a plug-and-play low-voltage line voltage optimization circuit in a three-phase power supply circuit provided in an embodiment of the present invention.

[0017] The letters in the image have the following meanings: Lo is the voltage output terminal; Li is the voltage input terminal; N is the neutral line; QF1 is the main circuit breaker; TA1 is the first current transformer; TA2 is the second current transformer; VT1 is the first mode control thyristor module, VT2 is the second mode control thyristor module, VT3 is the third mode control thyristor module, VT4 is the fourth mode control thyristor module; T1 is the compensation transformer; PCB is the voltage regulator controller; QF2 is the neutral line current detection switch; VT5 is the first gear shifting control thyristor module, VT6 is the second gear shifting control thyristor module, VT7 is the third gear shifting control thyristor module, VT8 is the fourth gear shifting control thyristor module, VT9 is the main control thyristor module; R is the gear shifting transition resistor. QF3 is the first three-phase circuit breaker and the second three-phase circuit breaker; QF4 is the second three-phase circuit breaker. Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0019] See Figure 1 As shown, the low-voltage line voltage optimization circuit provided in this application includes: a voltage regulator controller PCB, a first current transformer TA1, a compensation transformer T1, several tap-adjustment control thyristor modules, several mode control thyristor modules, a master control thyristor module, and a tap transition resistor R. Each thyristor module contains anti-parallel thyristors, adapting to bidirectional conduction during both positive and negative half-cycles of AC circuitry.

[0020] The adjusting winding of the compensation transformer T1 has different range contacts. The adjusting winding of the compensation transformer T1 supports coupling between the voltage input terminal Li and the neutral line N according to different ranges. When voltage adjustment is required, the compensation winding of the compensation transformer T1 is controlled to couple between the voltage input terminal Li and the voltage output terminal Lo. The voltage regulator PCB uses an embedded controller, which acquires the voltage at the voltage input terminal Li and the voltage output terminal Lo through the port. The voltage regulator PCB drives and connects to several thyristor modules for adjusting the gear position of the gear adjusting winding; the voltage regulator PCB drives and connects to four mode control thyristor modules for adjusting the state of the compensation winding; the voltage regulator PCB is electrically connected to a first current transformer TA1, which is located on the power supply line L and acquires the real-time current value of the power supply line L.

[0021] In the specific implementation process, such as Figure 1 As shown, the voltage regulator controller PCB drives and connects mode control thyristor modules VT1, VT2, VT3, and VT4. One end of mode control thyristor modules VT1 and VT4 is connected to the voltage input terminal Li, and the other end of mode control thyristor modules VT1 and VT4 is connected to the two ends of the compensation winding, respectively. One end of mode control thyristor modules VT2 and VT3 is connected to the voltage output terminal Lo, and the other end of mode control thyristor modules VT2 and VT3 is connected to the two ends of the compensation winding, respectively.

[0022] The voltage regulator controller PCB drives and connects to the first gear shifting control thyristor module VT5, the second gear shifting control thyristor module VT6, the third gear shifting control thyristor module VT7, and the fourth gear shifting control thyristor module VT8. One end of each gear shifting control thyristor module is connected to a different gear position contact of the gear shifting winding of the compensation transformer T1, and the other end of each gear shifting control thyristor module is electrically connected to the neutral line via a master control thyristor module VT9. The master control thyristor module VT9 is connected in parallel with a gear shifting transition resistor R.

[0023] In one implementation, the input and output of the power supply line, as well as the neutral line, are separated by the main circuit breaker QF1.

[0024] In one embodiment, the voltage regulator PCB is electrically connected to a second current transformer TA2, which is located on the neutral line N to collect the current of the neutral line N. A circuit breaker QF2 is installed on the neutral line.

[0025] like Figure 2As shown, in the three-phase power supply line, the voltage regulator PCB is connected to the main controller, and the main controller is connected to the first three-phase circuit breaker QF3 and the second three-phase circuit breaker QF4 installed in the three-phase power supply line. Several capacitor filter circuits are installed between the three-phase power supply line and the neutral line.

[0026] The working principle of this utility model is as follows: When the voltage regulator PCB detects that the input voltage Ui at the voltage input terminal Li is normal, it drives the first regulating control thyristor module VT5, the second regulating control thyristor module VT6, the third regulating control thyristor module VT7, the fourth regulating control thyristor module VT8, and the main control thyristor module VT9 to turn off at zero crossing; simultaneously, it drives the first mode control thyristor module VT1 and the second mode control thyristor module VT2 or the third mode control thyristor module VT3 and the fourth mode control thyristor module VT4 to turn on at zero crossing, and the compensation winding of the compensation transformer T1 is decoupled from the voltage input terminal Li and the voltage output terminal Lo, and the low-voltage line voltage optimization circuit operates in bypass mode. At this time, the output voltage Uo is equal to the input voltage Ui.

[0027] When the voltage regulator PCB detects that the input voltage Ui is too low, it drives the second-mode control thyristor module VT2 and the fourth-mode control thyristor module VT4 to conduct at zero crossing, or drives the first-mode control thyristor module VT1 and the third-mode control thyristor module VT3 to conduct at zero crossing; at the same time, it drives the first-gear control thyristor module VT5, the second-gear control thyristor module VT6, the third-gear control thyristor module VT7, and the fourth-gear control thyristor module VT8 to conduct at zero crossing according to the gear requirement, and the master control thyristor module VT9 to conduct at zero crossing; low-voltage line voltage optimization circuit. Figure 1 In the given example, the adjusting winding of the compensated transformer T1 has 4 positions. The controller can dynamically adjust to the appropriate position according to the fluctuation of the system voltage and the changes in the user load, so that the output voltage Uo always meets the power demand of the end user.

[0028] When the low-voltage line voltage optimization circuit malfunctions or the operating current is overloaded, the voltage regulator PCB enters the bypass operation mode, causing the compensation transformer T1 to stop working, so as to ensure the safe operation of the low-voltage line voltage optimization circuit and continuous power supply.

[0029] In the embodiments provided by this utility model, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, structures, or units, and may be electrical, mechanical, or other forms.

[0030] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0031] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0032] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A low-voltage line voltage optimization circuit, characterized in that, include: The adjusting winding of the compensation transformer T1 has different range contacts. The adjusting winding of the compensation transformer T1 supports coupling between the voltage input terminal Li and the neutral line N at different ranges. When voltage adjustment is required, the compensation winding of the compensation transformer T1 is controlled to couple between the voltage input terminal Li and the voltage output terminal Lo. The voltage regulator controller PCB acquires the voltage at the voltage input terminal Li and the voltage output terminal Lo. The voltage regulator controller PCB drives and connects to several gear-adjusting control thyristor modules for adjusting the gear position of the gear-adjusting winding. The voltage regulator controller PCB also drives and connects to four mode control thyristor modules for adjusting the state of the compensation winding. The voltage regulator controller PCB is electrically connected to the first current transformer TA1, which is located on the power supply line L and collects the current of the power supply line L.

2. The low-voltage line voltage optimization circuit according to claim 1, characterized in that, Any type of thyristor module contains anti-parallel thyristors, adapting to bidirectional conduction during AC positive and negative half-cycles.

3. The low-voltage line voltage optimization circuit according to claim 1, characterized in that, The voltage regulator controller PCB is electrically connected to the second current transformer TA2, which is located on the neutral line N to collect the current of the neutral line N. A circuit breaker QF2 is installed on the neutral line.

4. The low-voltage line voltage optimization circuit according to claim 1, characterized in that, The power supply line input and output, as well as the neutral line, are separated by the main circuit breaker QF1.

5. The low-voltage line voltage optimization circuit according to claim 1, characterized in that, The voltage regulator controller PCB drives and connects mode control thyristor module VT1, mode control thyristor module VT2, mode control thyristor module VT3 and mode control thyristor module VT4. One end of both mode control thyristor modules VT1 and VT4 is connected to the voltage input terminal Li, and the other end of both mode control thyristor modules VT1 and VT4 is connected to the two ends of the compensation winding, respectively; one end of both mode control thyristor modules VT2 and VT3 is connected to the voltage output terminal Lo, and the other end of both mode control thyristor modules VT2 and VT3 is connected to the two ends of the compensation winding, respectively.

6. The low-voltage line voltage optimization circuit according to claim 1, characterized in that, One end of each of the different gear shifting control thyristor modules is connected to a different gear position contact of the gear shifting winding of the compensation transformer T1, and the other end of each gear shifting control thyristor module is electrically connected to the neutral line via a master control thyristor module VT9; the master control thyristor module VT9 is connected in parallel with a gear shifting transition resistor R.

7. The low-voltage line voltage optimization circuit according to claim 1, characterized in that, In a three-phase power supply line, the voltage regulator PCB is connected to the main controller, and the main controller is connected to the first three-phase circuit breaker QF3 and the second three-phase circuit breaker QF4 installed in the three-phase power supply line.

8. The low-voltage line voltage optimization circuit according to claim 7, characterized in that, Several capacitor filter circuits are installed between the three-phase power supply line and the neutral line.

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