Polycrystalline silicon reduction load reduction method and system with trigger angle locking and adjustment matched

Abstract

The invention discloses a polycrystalline silicon reduction load reduction method and system with cooperation of trigger angle locking and adjustment, and the method comprises the steps: deducing a formula related to electrical power and power adjustment through collection and analysis of main parameters in the operation process of a polycrystalline silicon reduction furnace group, and calculating the trigger angle change range of each reduction furnace based on real-time working conditions. When the power grid is in power shortage, the reduction furnace of which the lockable part of the system is in the trigger angle range carries out first-round power reduction; and if the adjusting amount is still insufficient, the Newton downhill iteration method is used for calculating the trigger angle adjusting amount of the remaining reduction furnaces in the non-locking trigger angle interval, and two-round power adjustment is carried out. The method improves the balance and adjustment capability of power grid operation, and can quickly respond to the power shortage of the power grid. Under the condition that the existing production process is not affected, the load of the polycrystalline silicon reduction furnace is rapidly reduced through triggering angle locking and adjustment matching, and the device has the advantages of being low in communication requirement, small in field modification and easy to implement.

Description

Technical Field

[0001] The present invention relates to the technical field of combining power system modeling simulation with load side management, and specifically to a polysilicon reduction load reduction method and system that cooperates with trigger angle locking and regulation. Background Art

[0002] Under the background of accelerating the construction of unified power market in my country, load, as an indispensable participant in the power market, can be introduced into the system frequency regulation, peak regulation and other scenarios by participating in auxiliary services, giving full play to the flexible regulation ability of adjustable load on the user side, and improving the balance and regulation ability of power grid operation. Industrial load has become an important flexible regulation resource due to its many advantages such as large single load capacity, good communication conditions, easy control and low transformation economy. Therefore, it is of great significance to study the key technologies for adjustable load to participate in power grid regulation, incorporate load resources into the normalized power system dispatching and operation, participate in power grid operation control and dynamic balance, promote the dispatching mode from traditional "source regulation" to "load regulation", and realize the coordinated control of source, grid, load and storage, which is of great significance to ensure the safe, stable and economic operation of modern power system. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] Therefore, the technical problem solved by the present invention is that the polysilicon reduction furnace has a slow response speed to load reduction during power grid power regulation, is inflexible in regulation, and may affect the production process.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for reducing polysilicon reduction load by coordinating trigger angle locking and regulation, comprising:

[0006] Collect the main parameters involved in the operation of the polysilicon reduction furnace group, and analyze and organize them;

[0007] By deriving the parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace, a derivation formula is established, and the trigger angle variation range of each reduction furnace is calculated based on real-time working conditions;

[0008] When there is a power shortage in the power grid and the polysilicon reduction furnace load needs to respond to power, the polysilicon reduction furnace group will partially lock the trigger angle of the reduction furnace group within the lockable trigger angle range to perform the first round of power reduction;

[0009] If there is still a shortage in the power regulation, the trigger angle of the remaining reduction furnaces in the non-locked trigger angle interval is adjusted based on the Newton downhill method to respond to the power, and a second round of power regulation is performed.

[0010] As a preferred scheme of the polysilicon reduction load reduction method coordinated with the trigger angle locking and adjustment described in the present invention, the main parameters involved in the operation of the polysilicon reduction furnace group include the temperature in the furnace, the voltage splicing gear, the splicing angle, the effective value of the silicon rod voltage, the power supply power of the reduction furnace, the cooling water speed adjustment ratio, the change in time, the energy required for heating the vapor deposition reaction gas, the surface temperature of the silicon rod, the proportion of reaction heat absorption, the total heat transfer coefficient of the silicon rod and the mixed gas, the total length of the silicon rod and the equivalent temperature of the chassis and furnace wall surface, etc.

[0011] As a preferred solution of the polysilicon reduction load reduction method with the trigger angle locking and regulation of the present invention, the derivation formula includes: first, in the calculation of the lockable interval of the trigger angle of the reduction furnace under the thermal power constraint, the heat dissipation power of the cooling water and the range of the water inlet speed regulation ratio are taken into consideration to obtain the control range of the surface temperature of the polysilicon rods involved in the downward power regulation;

[0012] Based on the most suitable temperature range of the polysilicon rod surface during stable operation, the lockable interval of the reduction furnace trigger angle under thermal and electrical constraints is calculated;

[0013] The formula is:

[0014]

[0015] Where P max Indicates the maximum operating power of the polysilicon reduction furnace under specific conditions, P min It indicates the minimum operating power of the polysilicon reduction furnace under specific conditions. r indicates the radius of the silicon rod, L indicates the total length of the silicon rod, K indicates the total heat transfer coefficient between the silicon rod and the mixed gas, T out represents the equivalent temperature of the chassis and the furnace wall surface, η represents the proportion of heat absorption by the reaction gas, U val1 represents the effective value of single-phase voltage, R represents the silicon rod resistance, α max Indicates the maximum trigger angle that can be locked by the reduction furnace splicing wave, U1 indicates the lower voltage level used in furnace operation, U2 indicates the higher voltage level used in furnace operation, α D Indicates the conduction dead zone.

[0016] As a preferred solution of the polysilicon reduction load reduction method with trigger angle locking and adjustment according to the present invention, the first round of power reduction includes: when the production trigger angle of the reduction furnace is determined to be within the lockable interval [α min , α max ], the high voltage range of the splicing circuit is quickly cut off through the switch quantity, and the chemical vapor deposition reaction temperature is maintained by the low voltage range alone, thereby realizing a rapid reduction in the reduction furnace load.

[0017] As a preferred solution of the polysilicon reduction load reduction method in accordance with the present invention in combination with trigger angle locking and regulation, wherein: after the first round of power reduction, the total power reduced by the reduction furnace group is compared with the power regulation amount required by the power grid to determine whether the requirement is met;

[0018] When the grid requirement is met, power adjustment is stopped;

[0019] When there is still a shortage of power regulation, a second round of power regulation is required.

[0020] As a preferred solution of the polysilicon reduction load reduction method in accordance with the present invention in combination with trigger angle locking and regulation, the two-round power regulation includes: preferentially regulating the trigger angle and calculating the trigger angle correction value for the polysilicon reduction furnace units that perform the two-round power regulation in the order of approaching the trigger angle dead zone;

[0021] Calculate the conduction angle correction value for the next iteration step according to the power shortage and the initial conduction angle correction value;

[0022] By adjusting the thyristor trigger angle, the active power of the reduction furnace load is close to the expected active power. By setting the target power deviation convergence condition to ΔP min ,ΔP min <P current -P order , P current is the current active power of the reduction furnace, P order is the expected active power of the reduction furnace;

[0023] After the trigger angle adjustment, when the current real-time power of the reduction furnace meets the target power deviation convergence condition, the iteration stops, and the reduction furnace power adjustment by the trigger angle is completed;

[0024] The formula for trigger angle update is expressed as:

[0025]

[0026] Among them, α0 represents the known initial trigger angle, Δα0 represents the correction value of the known initial trigger angle, and α k represents the trigger angle of the kth splicing wave, α k+1 represents the trigger angle of the k+1th splicing wave, λ represents the downhill factor, P k represents the active power after the kth iteration, P k-1 represents the active power after the k-1th iteration.

[0027] As a preferred scheme of the polysilicon reduction load reduction method with coordinated trigger angle locking and regulation described in the present invention, when the power grid system resumes normal operation, the polysilicon reduction furnaces that have locked the splicing trigger pulses participating in the power grid response will restore the splicing trigger pulses in turn to ensure the smooth restoration of the rated operating power of the reduction furnace.

[0028] A method and system for reducing polysilicon reduction load by combining trigger angle locking and regulation, wherein:

[0029] Data collection module, which collects the main parameters involved in the operation of the polysilicon reduction furnace group, and analyzes and organizes them;

[0030] The derivation module derives the parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace, establishes a derivation formula, and can calculate the trigger angle variation range of each reduction furnace based on real-time working conditions;

[0031] The first round of power reduction module, when there is a power shortage in the power grid and the polysilicon reduction furnace load needs to respond to the power, the polysilicon reduction furnace group will lock the wave trigger angle of some reduction furnaces within the lockable trigger angle range to perform the first round of power reduction;

[0032] The second-round power regulation module, if the power regulation amount is still insufficient, calculates the trigger angle adjustment amount for the remaining reduction furnaces in the non-locked trigger angle interval based on the Newton downhill iteration method, and performs second-round power regulation.

[0033] A computer device comprises: a memory and a processor; the memory stores a computer program, wherein the processor implements the steps of any one of the methods of the present invention when executing the computer program.

[0034] A computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of any one of the methods of the present invention.

[0035] Beneficial effects of the present invention: The polysilicon reduction load reduction method provided by the present invention with the trigger angle locking and adjustment coordination improves the balance and adjustment capability of the power grid operation, and can quickly respond to the power shortage of the power grid. Without affecting the existing production process, the polysilicon reduction furnace load can be quickly reduced by the trigger angle locking and adjustment coordination. The communication requirements are low, the on-site changes are small, and it is easy to implement. It provides additional damping control potential and has good prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 An overall flow chart of a method for reducing polysilicon reduction load by coordinating trigger angle locking and regulation provided in the first embodiment of the present invention;

[0038] Figure 2 A source and load topology model of a reduction furnace load for a polysilicon reduction load reduction method coordinated with trigger angle locking and regulation provided in a second embodiment of the present invention;

[0039] Figure 3 The first round reduction furnace active power rapid reduction curve of the polysilicon reduction load reduction method in which the trigger angle locking and regulation are coordinated provided in the second embodiment of the present invention;

[0040] Figure 4 A schematic diagram of a second round of single reduction furnace load reduction in a polysilicon reduction load reduction method in which trigger angle locking and adjustment are coordinated, provided in a second embodiment of the present invention;

[0041] Figure 5 A schematic diagram of a single reduction furnace wave splicing method for reducing polysilicon reduction load in coordination with trigger angle locking and regulation provided in a second embodiment of the present invention;

[0042] Figure 6 The frequency fluctuation curve of the polysilicon reduction load reduction method with trigger angle locking and regulation coordinated with the second embodiment of the present invention under power disturbance with or without load participation in system frequency support. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. The embodiments of the present invention and all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0044] Example 1, reference Figure 1 , which is an embodiment of the present invention, provides a method for reducing polysilicon reduction load by coordinating trigger angle locking and regulation, comprising:

[0045] S1: Collect the main parameters involved in the operation of the polysilicon reduction furnace group, and analyze and organize them.

[0046] Investigate the main parameters involved in the operation of the polysilicon reduction furnace group, and analyze and organize the main parameters involved in the operation of the polysilicon reduction furnace.

[0047] The parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace include the most suitable temperature for polysilicon smelting of 1000℃-1100℃, the voltage wave gear of 0V-380V, 380V-600V, 600V-800V, 800V-1500V, the power adjustment range of the reduction furnace that does not affect the production quality of polysilicon is: [γmin=80.5%, γmax=100%], the cooling water speed adjustment ratio is [90%, 100%], and the control range of the surface temperature Tx of the polysilicon rods involved in downward power regulation is [1000℃, 1080℃].

[0048] Furthermore, by comprehensively collecting and deeply analyzing the operating parameters of the polysilicon reduction furnace group, we can grasp the dynamic changes of various key parameters and provide accurate data support for subsequent power regulation. This ensures the accuracy of the basic data for the operation of the entire system and improves the effectiveness and accuracy of subsequent adjustment measures.

[0049] S2: By deriving the parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace, a derivation formula is established, which can calculate the variation range of the trigger angle of each reduction furnace based on the real-time operating conditions.

[0050] First, in the calculation of the lockable interval of the reduction furnace trigger angle under the constraint of heat-to-electricity, the heat dissipation power of the cooling water is taken into account. The surface temperature T of the polysilicon rods involved in the downward power regulation can be obtained by the range of the water inlet speed regulation ratio (90% ≤ β ≤ 100%). x The control range is determined by T x The maximum power P of the polysilicon load can be calculated by the corresponding formula (1) (2) max and minimum power P min , and then use the corresponding formula (3) to calculate the adjustment range of the single-phase voltage effective value, and then use the corresponding formula (4)(5) to calculate the lockable interval of the reduction furnace trigger angle under the thermal-electric constraint.

[0051]

[0052]

[0053]

[0054]

[0055]

[0056] Among them, P max Indicates the maximum operating power of the polysilicon reduction furnace under specific conditions, P min It indicates the minimum operating power of the polysilicon reduction furnace under specific conditions. r indicates the radius of the silicon rod, L indicates the total length of the silicon rod, K indicates the total heat transfer coefficient between the silicon rod and the mixed gas, T out represents the equivalent temperature of the chassis and the furnace wall surface, η represents the proportion of heat absorption by the reaction gas, U val1 represents the effective value of single-phase voltage, R represents the silicon rod resistance, α max Indicates the maximum trigger angle that can be locked by the reduction furnace splicing wave, U1 indicates the lower voltage level used in furnace operation, U2 indicates the higher voltage level used in furnace operation, α D Indicates the conduction dead zone.

[0057] Furthermore, by establishing a mathematical model and deriving formulas related to electrical power and power regulation, the trigger angle variation range of each reduction furnace can be accurately calculated according to the real-time working conditions. This process ensures the scientificity and operability of power regulation and provides a theoretical basis for real-time regulation of the system.

[0058] S3: When there is a power shortage in the power grid and the polysilicon reduction furnace load needs to respond to power, the polysilicon reduction furnace group will partially lock the trigger angle of the reduction furnaces within the lockable trigger angle range to carry out the first round of power reduction.

[0059] The first round of power reduction includes: when the production trigger angle of the reduction furnace is determined to be within the lockable interval of the reduction furnace trigger angle under the thermal power constraint [α min , α max ], the high voltage range of the splicing circuit is quickly cut off through the switch quantity, and the chemical vapor deposition reaction temperature is maintained by the low voltage range alone, thereby realizing a rapid reduction in the reduction furnace load.

[0060] After the first round of power reduction, the total power reduced by the reduction furnace group is compared with the power regulation amount required by the power grid to determine whether the requirement is met.

[0061] When the grid requirement is met, power adjustment is stopped.

[0062] When there is still a shortage of power regulation, a second round of power regulation is required.

[0063] Furthermore, when there is a power shortage in the power grid, the power grid dispatching requirements can be quickly responded to, and the power load of the polysilicon reduction furnace can be quickly reduced by locking the trigger angle, which can effectively relieve the pressure on the power grid and improve the balance and stability of the power grid. This method has the characteristics of fast response and simple operation, and can achieve power regulation without affecting the production process.

[0064] S4: If the power regulation amount is still insufficient, the trigger angle adjustment amount is calculated based on the Newton downhill iteration method for the remaining reduction furnaces in the non-locked trigger angle interval, and a second round of power regulation is performed.

[0065] The second round of power regulation includes adjusting the trigger angle of the polysilicon reduction furnace unit that performs the second round of power regulation and calculating the trigger angle correction value according to the trigger angle close to the regulation dead zone of the unit;

[0066] Calculate the conduction angle correction value for the next iteration step according to the power shortage and the initial conduction angle correction value;

[0067] By adjusting the thyristor trigger angle, the active power of the reduction furnace load is close to the expected active power. By setting the target power deviation convergence condition to ΔP min ,ΔP min <P current -P order , P current is the current active power of the reduction furnace, P order is the expected active power of the reduction furnace;

[0068] After the trigger angle adjustment, when the current real-time power of the reduction furnace meets the target power deviation convergence condition, the iteration stops, and the reduction furnace power adjustment by the trigger angle is completed.

[0069] The formula for trigger angle update is expressed as:

[0070] α1=α0+Δα0(6)

[0071]

[0072] Among them, α0 represents the known initial trigger angle, Δα0 represents the correction value of the known initial trigger angle, and α k represents the trigger angle of the kth splicing wave, α k+1 represents the trigger angle of the k+1th splicing wave, λ represents the downhill factor, P k represents the active power after the kth iteration, P k-1 represents the active power after the k-1th iteration.

[0073] When the power grid system resumes normal operation, the polysilicon reduction furnaces that have locked the splicing trigger pulses and are participating in the power grid response will restore the splicing trigger pulses in turn to ensure the smooth restoration of the rated operating power of the reduction furnaces.

[0074] Furthermore, when the first round of power reduction is not enough to meet the grid demand, the Newton downhill iteration method is used to further adjust the reduction furnace in the remaining non-locking trigger angle interval to ensure that the power regulation reaches the expected target. This not only makes up for the shortcoming of the first round of reduction, but also further improves the accuracy and reliability of power regulation through fine adjustment methods.

[0075] On the other hand, this embodiment also provides a polysilicon reduction load reduction system with trigger angle locking and adjustment, which includes:

[0076] The data collection module collects the main parameters involved in the operation of the polysilicon reduction furnace group and analyzes and organizes them.

[0077] The derivation module derives the parameters related to electrical power and power regulation involved in the operation process of the polysilicon reduction furnace, establishes a derivation formula, and can calculate the variation range of the trigger angle of each reduction furnace based on the real-time operating conditions.

[0078] The first round of power reduction module, when there is a power shortage in the power grid and the polysilicon reduction furnace load needs to respond to power, the polysilicon reduction furnace group will partially lock the reduction furnace wave trigger angle within the lockable trigger angle range to carry out the first round of power reduction.

[0079] The second-round power regulation module, if the power regulation amount is still insufficient, calculates the trigger angle adjustment amount for the remaining reduction furnaces in the non-locked trigger angle interval based on the Newton downhill iteration method, and performs second-round power regulation.

[0080] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. In this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0081] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with such instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with such instruction execution systems, devices or apparatuses.

[0082] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0083] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0084] Example 2, reference Figure 1 and Figure 2 Taking a polysilicon plant as an example, an electrical transient simulation model of a single polysilicon reduction furnace was built on PSCAD / EMTDC.

[0085] Taking a polysilicon plant in a certain region as an example, a source and load topology model including the polysilicon reduction furnace load is built on PSCAD / EMTDC. Figure 2 As shown. A 10kV synchronous generator with speed regulation characteristics is used for power supply, load 1 is 10MW, and load 2 is 25MW. There are 75 reduction furnace units in the polysilicon plant, and the power of a single reduction furnace is 5.5MW. The single reduction furnace voltage regulator is a three-phase secondary multi-tap transformer, which usually automatically switches to different voltage levels according to production conditions. This article takes the 5-level voltage of the secondary side of the reduction voltage regulator as an example (the voltage wave level is 0V-380V, 380V-600V600V-800V, 800V-1500V), and supplies power to the polysilicon rods for reduction reaction by adjusting the thyristor conduction angle and switching the transformer taps.

[0086] If the current power shortage on the grid side is 15MW.

[0087] Investigate the main parameters involved in the operation of the polysilicon reduction furnace group, and analyze and sort out the main parameters involved in the operation of the polysilicon reduction furnace;

[0088] The parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace include the most suitable temperature for polysilicon smelting of 1000℃-1100℃, the voltage wave gear of 0V-380V, 380V-600V, 600V-800V, 800V-1500V, the power adjustment range of the reduction furnace that does not affect the production quality of polysilicon is: [γmin=80.5%, γmax=100%], the cooling water speed adjustment ratio is [90%, 100%], and the control range of the surface temperature Tx of the polysilicon rods involved in downward power regulation is [1000℃, 1080℃].

[0089] By deriving the parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace and establishing the corresponding formula, the trigger angle variation range of each reduction furnace can be calculated based on the real-time working conditions;

[0090] First, in the calculation of the lockable interval of the reduction furnace trigger angle under the thermal-electric constraint, taking into account the heat dissipation power of cooling water and the range of water inlet speed adjustment ratio (90%≤β≤100%), the control range of the surface temperature Tx of the polycrystalline silicon rod participating in the downward power regulation can be obtained (1000≤Tx≤1080), and the lockable interval of the reduction furnace trigger angle under the thermal-electric constraint is calculated.

[0091] When the power grid issues a power command adjustment, this method can be used to perform the first round of power reduction, giving priority to reducing the reduction furnace load that meets the lock trigger pulse conditions. The first round of load rapid power reduction is as follows: Figure 3 After the first round of reduction, the total power reduction of the reduction furnace group is compared with the power regulation required by the power grid to determine whether the requirement is met. If there is still a shortage of power regulation, a second round of power regulation is required.

[0092] If the total power regulation of the polysilicon plant area given by the power grid side is 25MW, the plant area calculates the trigger angle locking interval of each reduction furnace according to the different operating parameters to perform the first round of rapid load reduction response. At this time, the power shortage is 10MW, and the second round of power regulation is required to judge the operating conditions of the reduction furnace. This paper uses the Newton downhill iteration method to adjust the trigger angle of the remaining reduction furnace units suitable for regulation to respond to the remaining power shortage. After calculating the splicing trigger angle of the remaining units, the reduction furnace unit with the splicing trigger angle value closest to the trigger angle adjustment dead zone is selected to preferentially use the Newton downhill iteration method for trigger angle adjustment. Through formula (6), the conduction angle correction amount can be predicted based on the power shortage, the initial correction value of the conduction angle and other information. By adjusting the conduction angle of the thyristor, the load active power approaches the expected active power. By setting the target power deviation convergence condition. When the current power of the reduction furnace meets the target power deviation convergence condition, the iteration stops and the regulation ends.

[0093] The simulation step size is set to 100μs, the simulation time is 40s, and the initial parameters of the model are given for simulation. The reduction furnace power is set to be adjusted by adjusting the trigger angle of the splicing wave from 8s onwards, and the required grid response power of the second round of reduction furnace is set to 10MW. The trigger angle adjustment value of each step is iteratively calculated by the Newton downhill method to obtain the simulation results of the power regulation of a single reduction furnace. Figure 4 As shown, the angles before and after adjustment of the voltage of a single reduction furnace are as follows: Figure 5 When the reduction furnace is reducing power, the system is actively supported by frequency as shown in Figure 6 As shown, it can be seen that when there is a shortage of external power, the Newton downhill iteration method can be used to adjust the reduction furnace wave trigger angle power to actively support the system to quickly restore stability.

[0094] The capacity of the above single reduction furnace is 5.5MW, and 10% of the power, i.e. 0.5MW, can be adjusted according to its actual working conditions. Similarly, the remaining reduction furnaces in the plant area can use the Newton downhill method to adjust the power according to their initial trigger angles according to their actual working conditions, and finally meet the power demand on the grid side.

[0095] After the power grid system resumes normal operation, the polysilicon reduction furnaces that have stopped sending splicing trigger pulses and participated in the power grid response will resume sending splicing trigger pulses in turn to ensure a smooth recovery process.

[0096] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for reducing polysilicon reduction load by combining trigger angle locking and adjustment, characterized in that: include: Collect the main parameters involved in the operation of the polysilicon reduction furnace group, and analyze and organize them; By deriving the parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace, a derivation formula is established, and the trigger angle variation range of each reduction furnace is calculated based on real-time working conditions; When there is a power shortage in the power grid and the polysilicon reduction furnace load needs to respond to power, the polysilicon reduction furnace group will partially lock the trigger angle of the reduction furnace group within the lockable trigger angle range to carry out the first round of power reduction; If there is still a shortage in the power regulation, the trigger angle of the remaining reduction furnaces in the non-locked trigger angle interval is adjusted based on the Newton downhill method to respond to the power, and a second round of power regulation is performed.

2. The method for reducing polysilicon reduction load by combining trigger angle locking and adjustment as claimed in claim 1, characterized in that: The main parameters involved in the operation of the polysilicon reduction furnace group include the temperature inside the furnace, the voltage wave gear, the wave angle, the effective value of the silicon rod voltage, the power supply power of the reduction furnace, the cooling water speed adjustment ratio, the change in time, the energy required for heating the vapor deposition reaction gas, the surface temperature of the silicon rod, the proportion of reaction heat absorption, the total heat transfer coefficient of the silicon rod and the mixed gas, the total length of the silicon rod, and the equivalent temperature of the chassis and furnace wall surface.

3. The method for reducing polysilicon reduction load by combining trigger angle locking and adjustment as claimed in claim 2, characterized in that: The derivation formula includes, firstly, in the calculation of the lockable interval of the reduction furnace trigger angle under the thermal power constraint, taking into account the heat dissipation power of the cooling water and the range of the water inlet speed adjustment ratio, to obtain the control range of the surface temperature of the polysilicon rods involved in the downward power regulation; Based on the most suitable temperature range of the polysilicon rod surface during stable operation, the lockable interval of the reduction furnace trigger angle under thermal and electrical constraints is calculated; The formula is: Where P max Indicates the maximum operating power of the polysilicon reduction furnace under specific conditions, P min It indicates the minimum operating power of the polysilicon reduction furnace under specific conditions. r indicates the radius of the silicon rod, L indicates the total length of the silicon rod, K indicates the total heat transfer coefficient between the silicon rod and the mixed gas, T out represents the equivalent temperature of the chassis and the furnace wall surface, η represents the heat absorption ratio of the reaction gas, U val1 represents the effective value of single-phase voltage, R represents the silicon rod resistance, α max Indicates the maximum trigger angle that can be locked by the reduction furnace splicing wave, U1 indicates the lower voltage level used in furnace operation, U2 indicates the higher voltage level used in furnace operation, α D Indicates the conduction dead zone.

4. The method for reducing polysilicon reduction load by combining trigger angle locking and adjustment as claimed in claim 3, characterized in that: The first round of power reduction includes: when the production trigger angle of the reduction furnace is determined to be within the lockable interval [α min , α max ], the high voltage range of the splicing circuit is quickly cut off through the switch quantity, and the chemical vapor deposition reaction temperature is maintained by the low voltage range alone, thereby realizing a rapid reduction in the reduction furnace load.

5. The method for reducing polysilicon reduction load by coordinating trigger angle locking and adjustment as claimed in claim 4, characterized in that: After the first round of power reduction, the total power reduced by the reduction furnace group is compared with the power regulation amount required by the power grid to determine whether the requirement is met; When the grid requirement is met, power adjustment is stopped; When there is still a shortage of power regulation, a second round of power regulation is required.

6. The method for reducing polysilicon reduction load by combining trigger angle locking and adjustment as claimed in claim 5, characterized in that: The two-round power regulation includes, for the polysilicon reduction furnace units that perform the two-round power regulation, preferentially adjusting the trigger angle and calculating the trigger angle correction amount in the order of approaching the trigger angle dead zone; Calculate the conduction angle correction value for the next iteration step according to the power shortage and the initial conduction angle correction value; By adjusting the thyristor trigger angle, the active power of the reduction furnace load is close to the expected active power. By setting the target power deviation convergence condition to ΔP min ,ΔP min <P current -P order , P current is the current active power of the reduction furnace, P order is the expected active power of the reduction furnace; After the trigger angle adjustment, when the current real-time power of the reduction furnace meets the target power deviation convergence condition, the iteration stops, and the reduction furnace power adjustment by the trigger angle is completed; The formula for trigger angle update is expressed as: Among them, α0 represents the known initial trigger angle, Δα0 represents the correction value of the known initial trigger angle, and α k represents the trigger angle of the kth splicing wave, α k+1 represents the trigger angle of the k+1th splicing wave, λ represents the downhill factor, P k represents the active power after the kth iteration, P k-1 represents the active power after the k-1th iteration.

7. The method for reducing polysilicon reduction load by combining trigger angle locking and adjustment as claimed in claim 6, characterized in that: When the power grid system resumes normal operation, the polysilicon reduction furnaces that have locked the splicing trigger pulses and are participating in the power grid response will restore the splicing trigger pulses in turn to ensure the smooth restoration of the rated operating power of the reduction furnaces.

8. A polysilicon reduction load reduction system based on trigger angle locking and adjustment, characterized in that: Data collection module, which collects the main parameters involved in the operation of the polysilicon reduction furnace group, and analyzes and organizes them; The derivation module derives the parameters related to electrical power and power regulation involved in the operation of the polysilicon reduction furnace, establishes a derivation formula, and can calculate the trigger angle variation range of each reduction furnace based on real-time working conditions; The first round of power reduction module, when there is a power shortage in the power grid and the polysilicon reduction furnace load needs to respond to the power, the polysilicon reduction furnace group will lock the wave trigger angle of some reduction furnaces within the lockable trigger angle range to perform the first round of power reduction; The second-round power regulation module, if the power regulation amount is still insufficient, calculates the trigger angle adjustment amount for the remaining reduction furnaces in the non-locked trigger angle interval based on the Newton downhill iteration method, and performs second-round power regulation.

9. A computer device comprising: Memory and processor; The memory stores a computer program, characterized in that: when the processor executes the computer program, the steps of the polysilicon reduction load reduction method by coordinating trigger angle locking and regulation are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the polysilicon reduction load reduction method are implemented by coordinating trigger angle locking and regulation.

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