CN114530893A - Modular power electronic type amorphous alloy on-load arc-free capacitance regulating system and method - Google Patents

Abstract

The invention discloses a modular power electronic type amorphous alloy on-load arc-free capacitance regulating system and method. The capacity regulating transformer comprises a boosting capacity regulating transformer body, a low-voltage primary side bidirectional thyristor valve group and a high-voltage secondary side bidirectional thyristor valve group. And the integrated main control system comprises a driving circuit, a signal conditioning circuit, a main control circuit, a voltage and current detection circuit, a switching power supply and a 5G communication module. The transformer can be widely applied to the output end of the photovoltaic power generation inverter as a boosting transformer, the power electronic type capacity regulating transformer of the system can solve the redundant loss of unmatched transformer capacity caused by photovoltaic power generation volatility, the transient process of arc-free capacity regulation can be quickly realized, the rapidity of capacity regulation is ensured, and the quality of power supply is also ensured. Meanwhile, the amorphous alloy is used as the iron core material of the transformer, so that the no-load loss of the transformer can be further reduced.

Description

A modular power electronic amorphous alloy on-load non-arc capacity regulation system and method

technical field

The invention belongs to the field of transformers, and in particular relates to a system and method for on-load non-arc capacity regulation of a modular power electronic amorphous alloy.

Background technique

With the advancement of science and technology and the rapid development of economy, the utilization rate of energy by human beings is getting higher and higher. Among all kinds of energy, electric energy is the most important energy source in people's production and life. Quality adjustment has been widely concerned by all walks of life. Power losses also affect the safety and economy of the grid.

Photovoltaic power generation is currently the most commonly used new energy source. As a kind of distributed energy, it is widely used in various types of microgrid systems at all levels. However, due to the uncertainty of illumination, the photovoltaic power generation will fluctuate frequently, making it difficult for the step-up transformer connected to the output side of the photovoltaic inverter to work in the rated state for a long time. This will cause large no-load losses.

Aiming at the problem of no-load loss caused by the uncertainty of power generation of photovoltaic booster transformers, the current solution mainly starts from the core material of the transformer, and selects the core material with lower loss, such as amorphous alloy material, and the same capacity level. Compared with the traditional silicon steel material, the no-load loss can be reduced by 60%.

However, the energy-saving angle aimed at these existing technologies is too single, and the traditional amorphous alloy transformer cannot realize the self-adaptive adjustment of the capacity. However, the existing capacity regulating transformers are only designed for the step-down transformer of the distribution network, and it is difficult to achieve no arc and fast capacity regulation. Therefore, it is necessary to design a power electronic amorphous alloy capacity regulating transformer suitable for photovoltaic step-up transformers.

SUMMARY OF THE INVENTION

The invention discloses a modular power electronic amorphous alloy on-load non-arc capacity regulation system and method, which aims to solve the problem that the step-up transformer at the power generation inverter end of the traditional photovoltaic power generation system cannot realize capacity regulation, and at the same time overcome the traditional capacity regulation Transformers cannot achieve the shortcoming of fast, arc-free switching capacity.

To achieve the above object, the present invention adopts the following technical solutions to realize:

A modular power electronic amorphous alloy on-load non-arc capacity regulation system, comprising a transformer body, one side of the transformer body is a low-voltage input side, and the other side is a high-voltage output side;

The low-voltage input side is connected with an inverter, and the inverter is connected with a photovoltaic power source; the high-voltage output side is connected with a medium-voltage transmission grid;

The low-voltage input side includes three parallel low-voltage end input side thyristor valve groups, each low-voltage end input side thyristor valve group includes a second inductor and a third inductor connected in parallel, and the first end of the second inductor and the third inductor are connected in parallel. The first end is connected to the output end of the inverter at the same time, the second end of the second inductor and the second end of the third inductor are connected to the first end of the first inductor at the same time, and the first inductor in the three input side thyristor valve groups The second end of the second inductance is commonly connected to the transformer body; a triac S _a5 , S _b5 or S _c5 is arranged between the first end of the second inductance and the first end of the third inductance, and the second end of the second inductance is connected to the first end of the third inductance. A triac S _a4 , S _b4 or S _c4 is arranged between the second ends of the three inductors, and a triac S _a3 , S _b3 or S is arranged between the first end of the second inductor and the second end of the third inductor _c3 ;

The high-voltage output side includes a thyristor valve group (9) on the output side of the high-voltage end, and the thyristor valve group (9) on the output side of the high-voltage end includes three fourth inductors connected end to end in sequence, and the three fourth inductors form a triangle, each of which The first end of the fourth inductor is provided with a triac S _a1 , S _b1 or S _c1 ; a branch is provided between each bidirectional thyristor S _a1 , S _b1 or S _c1 and the correspondingly connected fourth inductor, on the branch A bidirectional thyristor S _a2 , S _b2 or S _c2 is provided, and the second ends of the bidirectional thyristors S _a2 , S _b2 and S _c2 on the three branches are connected;

The output end of the inverter, the input end of the medium voltage transmission network, the low voltage end input side thyristor valve group and the high pressure end output side thyristor valve group are jointly connected to the controller.

A further improvement of the present invention is:

Preferably, the transformer body includes a magnetic core and a winding wound on the magnetic core;

The magnetic core is an amorphous alloy.

Preferably, each low-voltage end input side thyristor valve group is provided with an input drive port and an input detection port.

Preferably, the input side of the low voltage end is connected to the inverter through an input voltage port.

Preferably, the output side thyristor valve group of the high voltage end is provided with an output drive port and an output detection port.

Preferably, the output side of the high voltage end is connected to the medium voltage transmission network through an output voltage port.

Preferably, the controller includes a main control board, and the main control board is simultaneously connected with a drive circuit board, an electric energy management control board, a pulse generation circuit board and a 5G communication module.

Preferably, the drive circuit board is used to drive each triac on and off; the power energy management control board is used to collect voltage and current signals from the output end of the inverter, and collect current signals from the input end of the medium voltage transmission network The pulse generation circuit board is used to convert the level signal of the main control board into a pulse signal, and input the pulse signal to the power energy management control board; the 5G communication module is used for the communication between the main control board and the upper computer.

A capacity regulation method for a modular power electronic amorphous alloy on-load non-arc capacity regulation system, the capacity regulation point of the capacity regulation system is calculated, and when the output power on one side of the inverter is less than the capacity regulation point, the low voltage end input is adjusted The side thyristor valve group and the output side thyristor valve group of the high pressure end reduce the capacity adjustment point of the capacity adjustment system;

When the output power of the inverter side is greater than the capacity adjustment point, judge whether the input power of the medium voltage transmission grid is greater than the capacity adjustment point. If the input power of the medium voltage transmission grid is greater than the capacity adjustment point, increase the capacity adjustment point of the capacity adjustment system. , if the input power of the medium voltage transmission network is less than the capacity adjustment point, reduce the capacity adjustment point of the capacity adjustment system.

Preferably, the process of reducing the capacity adjustment point of the capacity adjustment system is as follows:

For the high-voltage output side, when the current flowing through the triac S _a1 is zero, the triac S _a2 is triggered; when the current flowing through the triac S _b1 is zero, the triac S _b2 is triggered; when the current flowing through the triac S b1 is zero, the triac S _b2 is triggered; When the current is zero, the triac S _c2 is triggered;

For the low-voltage input side, the triac S _a3 is triggered when the currents flowing through the triacs S _a5 and S _a4 are both 0; the triac S _b3 is triggered when the currents flowing through the triacs S _b5 and S _b4 are both 0; When the currents flowing through the triac S _c5 and S _c4 are both 0, the triac S _c3 is triggered;

The process of increasing the capacity adjustment point of the capacity adjustment system is as follows:

For the high voltage output side, when the current flowing through the triac S _a2 is zero, the triac S _a1 is triggered; when the current flowing through the triac S _b2 is zero, the triac S _b1 is triggered; when the current flowing through the thyristor S _c2 is zero, the triac S b1 is triggered; Trigger the thyristor S _c1 when the current is zero;

For the low-voltage input side, when the current flowing through the triac S _a3 is 0, the triac S _a5 and S _a4 are triggered; when the current flowing through the triac S _b3 is 0, the triac S _b5 and S _b4 are triggered; when When the current flowing through the triac S _c3 is 0, the triac S _c5 and S _c4 are triggered.

Compared with the prior art, the present invention has the following beneficial effects:

The invention discloses a modular power electronic amorphous alloy on-load non-arc capacity regulation system. The capacity regulating transformer includes a step-up capacity regulating transformer body, a low-voltage primary side bidirectional thyristor valve group, and a high-voltage secondary side bidirectional thyristor valve group. And an integrated main control system including a drive circuit, a signal conditioning circuit, a main control circuit, a voltage and current detection circuit, a switching power supply, and a 5G communication module. As a step-up transformer, this transformer can be widely used at the output end of photovoltaic power generation inverters. The power electronic capacity regulating transformer of this system can solve the redundant loss caused by the unmatched capacity of the transformer caused by the fluctuation of photovoltaic power generation, and can quickly The transient process of realizing arc-free capacity adjustment ensures the rapidity of capacity adjustment and the quality of power supply. At the same time, the use of amorphous alloy as the core material of the transformer can further reduce the no-load loss of the transformer.

The invention also discloses a modular power electronic amorphous alloy on-load non-arc capacity adjustment method. The method is aimed at the fluctuation problem of photovoltaic power generation. According to the control algorithm and strategy set internally, the switching between the two capacities is fast, arc-free and smooth to reduce the loss of the transformer. At the same time, the introduction of amorphous alloy materials can maximize the purpose of energy saving and loss reduction of this capacity regulating transformer.

Description of drawings

FIG. 1 is a schematic structural diagram of a power electronic amorphous alloy photovoltaic capacity regulating transformer of the present invention.

FIG. 2 is a schematic structural diagram of a power electronic amorphous alloy photovoltaic capacity regulating transformer according to the present invention.

FIG. 3 is a circuit diagram of a power electronic amorphous alloy photovoltaic capacity regulating transformer of the present invention.

FIG. 4 is a flow chart of the capacity regulation strategy for power electronic amorphous alloy photovoltaics of the present invention.

Among them, 1-controller; 2-low-voltage side input side thyristor valve group; 3-input drive port; 4-input detection port; 5-input voltage port; 6-output voltage port; 7-output drive port; 8-output Detection port; 9- high-voltage output side thyristor valve group; 10- magnetic core; 11- base.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

The present invention discloses a modular power electronic amorphous alloy on-load non-arc capacity regulation system. Referring to FIG. 1 , the system includes a step-up capacity regulation transformer body, a power electronic switch valve group, a controller 1 and a current sensor module.

The controller 1 is composed of a main control board (which can be a series of mainstream controllers such as DSP controller and ST), a bidirectional thyristor drive circuit board, a power energy management control board, a pulse generation circuit board and a 5G communication module. The bidirectional thyristor drive circuit, power energy management control board, pulse generation circuit board, and 5G communication module are all connected to the main control board. The main control board outputs 15 control signals, one bidirectional thyristor and one bidirectional thyristor driving circuit are correspondingly connected, each control signal is input to a bidirectional thyristor driving circuit board, and the output signal of each driving circuit board is input to a bidirectional thyristor for controlling its off. The power energy management control board is used to detect the current signal of the high-voltage output side of the system, (the voltage signal of the high-voltage output side is a fixed value and is related to the voltage level of the grid), as well as the voltage and current signals of the low-voltage input side, and then calculate the active and non-active power. The size of the functional power is transmitted to the main control board for control decision-making. The pulse generation circuit board is used to convert the level signal of the main control board into a pulse signal and input it to the triac drive circuit board, and the voltage sensor for testing the voltage on the low-voltage input side is integrated on the power energy management control board. The voltage value collected by the control board is sampled. Finally, the 5G communication module is used for the communication between the controller and the upper computer on the user side, which is convenient for centralized scheduling and operation.

The topological structure of the relationship between the transformer body and the power electronic switch valve group is shown in Figure 1. The main use scenario of the capacity regulation system designed by the present invention is to connect the photovoltaic inverter and the medium voltage transmission grid. Compared with the traditional capacity regulation transformer, the output end of this capacity regulation system is 35KV medium and high voltage connected to the medium voltage transmission grid, while the input end of the capacity regulation system is the medium and low voltage output by the photovoltaic inverter. Therefore, when switching the capacity adjustment strategy, it is necessary to comprehensively consider the power on the power supply side and the power on the load side to make judgments and perform corresponding capacity switching.

Referring to Figure 1, the thyristor valve group of the power electronic switch is designed into two types: high-voltage side and low-voltage side. The high-voltage side and low-voltage side are respectively arranged on both sides of the transformer body; It is a series-parallel topology, designed with 3 discrete valve groups, each valve group has three bidirectional thyristors, and 9 bidirectional thyristors are used as capacity regulating switches. The high-voltage side is the output side, which is defined as the high-voltage output side. The Y-shaped and delta-shaped topology is interchanged, and six thyristors are used as a separate valve group as a capacity regulating switch. In addition, each triac has a current sensor, which is used for the main control board to detect the current size to select the control strategy.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , it is a possible schematic structural diagram of a power electronic amorphous alloy photovoltaic capacity regulating transformer of the present invention, but it is not limited to this structural schematic diagram.

Referring to FIG. 2, the transformer of the present invention is provided with a base 11, and a controller 1 is set on the base 11. The controller 1 is provided with a main control board integrated with the entire capacity regulating transformer, a bidirectional thyristor driving circuit board, and a power energy management board. Control board, pulse generation circuit board and 5G communication module. The controller 1 is provided with a display screen and several buttons. The back of the controller 1 is provided with 44 wiring ports, 15 of which are output wiring ports, and the output wiring ports are connected to the triac drive circuit board in the controller 1 , each output wiring port is connected with a triac for outputting the driving signal of the triac; the other 15 wiring ports are input wiring ports, and the input wiring ports are connected with the power energy management control board in the controller 1, and the Each wiring port outside the controller 1 is connected to a triac, which is used to input the current detection signals of the 15 channels of triacs collected; the remaining 12 wiring ports are used to detect the three-phase voltage on the low-voltage side and the high-voltage side and Phase current, and there are also 2 wiring ports for introducing single-phase AC voltage from the inverter on the low-voltage side, and auxiliary power supply for the entire controller through the internal switching power supply module.

The base 11 is provided with the magnetic core 10 and the windings wound thereon. The material of the magnetic core 10 used in the transformer body is an amorphous alloy, and the no-load loss of the amorphous alloy capacity regulating transformer under the same capacity can be reduced by about 60% compared with the no-load loss of the traditional silicon steel material transformer.

Referring to FIG. 2 , three low-voltage side input side thyristor valve groups 2 are arranged on one side of the magnetic core 10 , and only the external heat sink structure of the valve group is shown in FIG. 2 . Each low-voltage side input side thyristor valve group 2 is integrated with 3 triacs with high withstand voltage and 3 current sensors. More specifically, referring to FIG. 1 , an input drive port 3 for driving a triac and an output detection port 4 for current and voltage detection of the triac are provided on the upper part of each low-voltage side input side thyristor valve group 2 . The three low-voltage side input side thyristor valve groups 2 are connected in parallel. The low-voltage side input side thyristor valve group 2 of each phase is connected to a phase winding, and the low-voltage side input side thyristor valve group 2 of each phase is connected from the low-voltage input side to The direction of the magnetic core 10 is provided with two parallel inductances, namely a second inductance and a third inductance, the second ends of the two parallel inductances are commonly connected to the first inductance, and the second end of the first inductance is connected to phase winding, a triac is arranged between the first end of the second inductor and the first end of the third inductor, a triac is arranged between the first end of the second inductor and the second end of the third inductor, the third A triac is arranged between the second end of the second inductor and the second end of the third inductor. Taking phase A as an example, the first inductance is W ₂₁ , the second inductance is W ₂₂ , the third inductance is W ₂₃ , W ₂₂ and W ₂₃ are connected in parallel, and the second end of W ₂₂ and the second end of W ₂₃ are in common with W The first end of ₂₁ is connected, a switch S _a5 is arranged between the second end of W ₂₂ and the second end of W ₂₃ , a switch S _a4 is arranged between the second end of W ₂₂ and the second end of W ₂₃ , and W A switch S _a3 is arranged between the first end of ₂₂ and the second end of W ₂₃ , and the first end of W ₂₂ and the first end of W ₂₃ are connected to a of the inverter output in common. The connection method of phase B and phase C is the same as that of phase A, and will not be repeated here. Each phase thyristor valve group 2 is connected to one phase of the output voltage of the inverter through the input voltage port 5 .

Referring to FIG. 3 , the output side of the magnetic core 10 is provided with a high voltage end output side thyristor valve group 9 . The end of the thyristor valve group 9 on the output side of the high-voltage end is provided with an output voltage port 6 for the secondary side output voltage, and the output voltage port 6 for the secondary side output voltage is connected to the voltage transmission network. Each phase of the thyristor valve group 9 on the output side of the high-voltage side is connected to its corresponding winding. See Figure 3 for control. Only the structure of the heat sink outside the thyristor valve group 9 on the output side of the high-voltage side is shown, which integrates 6 bidirectional thyristors. and 6 current sensors. The upper part of the high-voltage output side thyristor valve group 9 is provided with an output drive port 7 for driving the triac and an output detection port 9 for thyristor current detection, and the output drive port 7 is connected with the triac drive circuit board of the controller 1 through the output wiring port, The output detection port 9 is connected with the electric energy management control board in the controller 1 through the input wiring port. The thyristor valve 9 on the output side of the high-voltage end is connected in a delta manner by three fourth inductors, the three fourth inductors are connected end to end, and a bidirectional thyristor is arranged at the first end of each first inductor, which are respectively S _a1 , S _b1 and S _c1 ; the first ends of S _a1 , S _b1 and S _c1 are connected to their corresponding inductances, and the second ends are connected to the medium voltage transmission network; the first ends of S _a1 , S _b1 and S _c1 are provided with branches, and the branches are A bidirectional thyristor is provided, which are respectively S _a2 , S _b2 and S _c2 ; the first ends of S _a2 , S _b2 and S _c2 are connected to the first ends of S _a1 , S _b1 and S _c1 , and the first ends of S _a2 , S _b2 and S c1 are connected. The second end of S _c2 is connected to a point to form a Y-shaped topology.

Figure 1 shows how this transformer is connected and controlled in the entire photovoltaic power system. First, the DC voltage output by the photovoltaic panel is output as a three-phase AC voltage through the inverter. This three-phase AC voltage is connected to the low-voltage side ABC of the capacity regulating transformer, and the high-voltage side of the transformer outputs a high voltage of 35KV and is integrated into the grid. In the structure of capacity regulation, since this is a step-up transformer, compared with the traditional capacity regulation transformer, the triangular Y-shaped structure of this capacity regulation transformer is located on the secondary side of the transformer, and the series-parallel structure is located on the primary side of the capacity regulation transformer. , which is based on the consideration of the current withstand value of the transformer inductance and the withstand voltage value of the triac. Due to the particularity of the photovoltaic capacity regulating transformer, compared with the ordinary power distribution side capacity regulating transformer, it is necessary to detect the voltage and current on the input side of the photovoltaic inverter and the current on the input grid side at the same time. Once the power of one side is greater than the power corresponding to the capacity adjustment point, the capacity adjustment signal can be sent out, and the controller will then send out the corresponding trigger drive signal.

Compared with the traditional capacity regulating transformer, the control strategy of the capacity regulating transformer of the present invention needs to detect more signals, and the corresponding control strategies of the transformer are also different. During the process of generating electricity, the uncertainty of the conditions will cause the uncertainty of the power generated by the power source, which makes the generated power random. The problem solved by the traditional capacity regulating transformer is to adjust the capacity according to the power size of the load side, because the power grid can be considered as an infinite power source, but the step-up capacity regulating transformer used in photovoltaic power supply is different, not only It is necessary to consider the power size of the load side, and also need to consider the power size of the power supply. The specific capacity adjustment logic flow chart is shown in Figure 4:

The specific capacity adjustment logic flow chart is shown in Figure 4. According to the capacity adjustment calculation algorithm, the capacity adjustment point of the capacity adjustment transformer at the current moment can be obtained. Once the output power of the power generation side is less than this capacity adjustment point, it is necessary to control the action of the capacity adjustment switch to adjust the capacity to a small capacity state. If the power on the generation side is greater than the capacity adjustment point, it is necessary to judge the power on the load side. If the power on the load side is also greater than the capacity adjustment point, the capacity adjustment system should be adjusted to a large capacity state. When it is less than the capacity adjustment point, the capacity of the capacity adjustment system needs to be adjusted to a small capacity state.

Since the present invention is aimed at the capacity-adjusting transformer of the power electronic switch, the capacity-adjusting process without arc and load can be realized through some control strategies, and the action speed is fast. The specific switching strategy is to take the secondary side of the process of adjusting large capacity to small capacity as an example, because switches S _a1 , S _b1 , and S _c1 are turned on and S _a2 , S _b2 , and S _c2 are closed when the capacity is large. Therefore, when adjusting to a small capacity, it is necessary to close the switches S _a1 , S _b1 , and S _c1 , and to open the switches S _a2 , S _b2 , and S _c2 . If the trigger signal of the triac S _a1 , S _b1 , and S _c1 is canceled when it is turned off, the trigger signal is immediately applied to the thyristor S _a2 , S _b2 , and S _c2 , which may cause the six thyristors to be in the closed state at the same time and cause the power supply Short circuit damages the device. Therefore, the control strategy proposed in this embodiment is: detect the currents flowing through the thyristors S _a1 , S _b1 , and S _c1 , and trigger the thyristor S _a2 when the current flowing through the thyristor S _a1 is zero; when the current flowing through the thyristor S _b1 Trigger the thyristor S _b2 when it is zero; trigger the thyristor S _c2 when the current flowing through the thyristor S _c1 is zero; in this way, the power supply can be prevented from short-circuiting and damaging the equipment, and at the same time, there is no need to power off and then adjust the capacity to ensure the quality of the power supply. For the thyristor on the primary side, take the process of adjusting the large capacity of phase A to small capacity as an example: first detect the current flowing through the thyristors of _Sa5 and _Sa4 , wait for the current flowing through the two triacs to be 0, and then trigger S _a3 thyristor; for the thyristor on the primary side, take the process of adjusting the large capacity of phase B to small capacity as an example: first detect the current flowing through the thyristor S _b5 and S _b4 , and wait for the current flowing through the two bidirectional thyristors to be 0. Then trigger the S _b3 thyristor; for the thyristor on the primary side, take the process of adjusting the large capacity of the C phase to the small capacity as an example: first detect the current flowing through the thyristor of S _c5 and S _c4 , and wait for the current flowing through the two triacs to be both. After it is 0, trigger the S _c3 thyristor; in this way, it can ensure that the next set of thyristors are triggered immediately after the previous set of thyristors are effectively turned off, thereby realizing seamless switching between the two capacities and no power supply short-circuit accident.

Taking the secondary side of the process of adjusting a small capacity to a large capacity as an example, the control strategy proposed in this embodiment is: to detect the current flowing through the thyristor S _a2 , S _b2 , and S _c2 , when the current flowing through the thyristor S _a2 is zero. Trigger the thyristor S _a1 at the same time; trigger the thyristor S _b1 when the current flowing through the thyristor S _b2 is zero; trigger the thyristor S _c1 when the current flowing through the thyristor S _c2 is zero; in this way, the power supply short circuit can be prevented from damaging the equipment, and at the same time There is no need to power off and then adjust the capacity to ensure the quality of power supply.

For the thyristor on the primary side, take the process of adjusting the small capacity of phase A to large capacity as an example: first detect the current flowing through the thyristor of _Sa3 , wait for the current flowing through this triac to be 0, and then trigger the thyristor of _Sa5 and _Sa4 . For the thyristor on the primary side, take the process of adjusting the small capacity of the B phase to the large capacity as an example: first detect the current flowing through the thyristor of S _b3 , wait for the current flowing through the bidirectional thyristor to be 0, and then trigger the thyristor S _b5 and S _b4 . For the thyristor on the primary side, take the process of adjusting the small capacity of the C phase to the large capacity as an example: first detect the current flowing through the thyristor of S _c3 , wait for the current flowing through the bidirectional thyristor to be 0, and then trigger the S _c5 and S _c4 thyristors.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. a modular power electronic type amorphous alloy on-load non-arc capacity regulation system, characterized in that, comprising a transformer body, one side of the transformer body is a low-voltage input side, and the other side is a high-voltage output side; The low-voltage input side is connected with an inverter, and the inverter is connected with a photovoltaic power source; the high-voltage output side is connected with a medium-voltage transmission grid; The low-voltage input side includes three parallel-connected low-voltage end input-side thyristor valve groups (2), each low-voltage end input-side thyristor valve group (2) includes a parallel-connected second inductor and a third inductor, and the first inductance of the second inductor The terminal and the first terminal of the third inductor are connected to the output terminal of the inverter at the same time, the second terminal of the second inductor and the second terminal of the third inductor are connected to the first terminal of the first inductor at the same time, and the three input side thyristors The second end of the first inductor in the valve group (2) is commonly connected to the transformer body; a triac S _a5 , S _b5 or S _c5 is arranged between the first end of the second inductor and the first end of the third inductor, A triac S a4 , S b4 or S c4 is arranged between the second end of the second inductor and the second end of the third inductor, and a triac S _a4 , S _b4 or S _c4 is arranged between the first end of the second inductor and the second end of the third inductor Triac S _a3 , S _b3 or S _c3 ; The high-voltage output side includes a thyristor valve group (9) on the output side of the high-voltage end, and the thyristor valve group (9) on the output side of the high-voltage end includes three fourth inductors connected end to end in sequence, and the three fourth inductors form a triangle, each of which The first end of the fourth inductor is provided with a triac S _a1 , S _b1 or S _c1 ; a branch is provided between each bidirectional thyristor S _a1 , S _b1 or S _c1 and the correspondingly connected fourth inductor, on the branch A bidirectional thyristor S _a2 , S _b2 or S _c2 is provided, and the second ends of the bidirectional thyristors S _a2 , S _b2 and S _c2 on the three branches are connected; The output end of the inverter, the input end of the medium voltage transmission network, the low voltage end input side thyristor valve group (2) and the high pressure end output side thyristor valve group (9) are jointly connected to the controller (1). 2. A modular power electronic amorphous alloy on-load non-arc capacity regulation system according to claim 1, wherein the transformer body comprises a magnetic core (10) and is wound on the magnetic core (10). the winding; The magnetic core (10) is an amorphous alloy. 3. A kind of modularized power electronic type amorphous alloy on-load non-arc capacity regulation system according to claim 1, characterized in that, each low-voltage end input side thyristor valve group (2) is provided with an input drive port ( 3) and an input detection port (4). 4. A modular power electronic amorphous alloy on-load non-arc capacity regulation system according to claim 1, characterized in that, the input side of the low-voltage end is connected to the inverter through an input voltage port (5). 5. A modular power electronic type amorphous alloy on-load non-arc capacity adjustment system according to claim 1, characterized in that, an output drive port ( 7) and output detection port (8). 6. A modular power electronic amorphous alloy on-load non-arc capacity regulation system according to claim 1, characterized in that, the output side of the high-voltage end is connected to the medium-voltage power transmission network through an output voltage port (6) . 7. A modular power electronic amorphous alloy on-load non-arc capacity regulation system according to claim 1, wherein the controller (1) comprises a main control board, and the main control board is simultaneously connected with a driver Circuit boards, power energy management control boards, pulse generation circuit boards and 5G communication modules. 8. A modular power electronic amorphous alloy on-load non-arc capacity regulation system according to claim 7, wherein the drive circuit board is used to drive the on-off of each triac; the electrical energy The energy management control board is used to collect voltage and current signals from the output end of the inverter, and the current signal from the input end of the medium voltage transmission network; the pulse generation circuit board is used to convert the level signal of the main control board into a pulse signal, Input the pulse signal to the electric energy management control board; the 5G communication module is used for the communication between the main control board and the upper computer. 9. A capacity regulation method for a modular power electronic amorphous alloy on-load and arc-free capacity regulation system, characterized in that the capacity regulation point of the capacity regulation system is calculated, and when the output power on one side of the inverter is less than the capacity regulation point When the thyristor valve group (2) on the input side of the low-voltage side and the thyristor valve group (9) on the output side of the high-pressure side are adjusted, the capacity adjustment point of the capacity adjustment system is reduced; When the output power of the inverter side is greater than the capacity adjustment point, judge whether the input power of the medium voltage transmission grid is greater than the capacity adjustment point. If the input power of the medium voltage transmission grid is greater than the capacity adjustment point, increase the capacity adjustment point of the capacity adjustment system. , if the input power of the medium voltage transmission network is less than the capacity adjustment point, reduce the capacity adjustment point of the capacity adjustment system. 10. The capacity regulation method of a modular power electronic type amorphous alloy on-load non-arc capacity regulation system according to claim 9, wherein the process of reducing the capacity regulation point of the capacity regulation system is: For the high-voltage output side, when the current flowing through the triac S _a1 is zero, the triac S _a2 is triggered; when the current flowing through the triac S _b1 is zero, the triac S _b2 is triggered; when the current flowing through the triac S b1 is zero, the triac S _b2 is triggered; When the current is zero, the triac S _c2 is triggered; For the low-voltage input side, the triac S _a3 is triggered when the currents flowing through the triacs S _a5 and S _a4 are both 0; the triac S _b3 is triggered when the currents flowing through the triacs S _b5 and S _b4 are both 0; When the currents flowing through the triac S _c5 and S _c4 are both 0, the triac S _c3 is triggered; The process of increasing the capacity adjustment point of the capacity adjustment system is as follows: For the high-voltage output side, the triac S _a1 is triggered when the current flowing through the triac S _a2 is zero; when the current flowing through the triac S _b2 is zero, the triac S _b1 is triggered; when the current flowing through the thyristor S _c2 is zero, the triac S b1 is triggered; Trigger the thyristor S _c1 when the current is zero; For the low-voltage input side, when the current flowing through the triac S _a3 is 0, the triac S _a5 and S _a4 are triggered; when the current flowing through the triac S _b3 is 0, the triac S _b5 and S _b4 are triggered; when When the current flowing through the triac S _c3 is 0, the triac S _c5 and S _c4 are triggered.

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