CN106533222B - PSM high-voltage power supply system and feedback control implementation method thereof - Google Patents
PSM high-voltage power supply system and feedback control implementation method thereof Download PDFInfo
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- H—ELECTRICITY
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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Abstract
The invention discloses a PSM high-voltage power supply system and a feedback control implementation method thereof, and the PSM high-voltage power supply system comprises a high-voltage wire inlet unit, wherein the high-voltage wire inlet unit is formed by respectively connecting two high-voltage circuit breaker cabinets in series with a high-voltage contactor cabinet, the two high-voltage contactor cabinets are respectively connected with a multi-winding high-voltage isolation transformer, the multi-winding high-voltage isolation transformer is respectively connected with a low-frequency rectification power supply module and a high-frequency rectification power supply module, and the low-frequency rectification power supply module and the high-frequency rectification power supply module are connected in series and then connected to a load.
Description
Technical Field
The invention relates to the technical field of high-voltage power supply systems based on a PSM technology, in particular to a PSM high-voltage power supply system and a feedback control implementation method thereof.
Background
As a focus of domestic and foreign research in recent years, PSM switching power supply technology has been rapidly developed and has been used with great success in tokamak-assisted heating high voltage power supply systems. The high-voltage power supply system based on the PSM switching power supply technology takes a single rectification power supply module as a core, the establishment of the final direct-current high voltage is realized by utilizing the series connection of a plurality of modules, a negative feedback mechanism is introduced into a control strategy, and the voltage control precision can be improved by automatically increasing and decreasing the modules, so that the influence of various disturbances on the output voltage is reduced.
For various disturbances within a design parameter range, the voltage control precision can be obviously improved by reducing the feedback control step length time, namely improving the feedback control speed within a certain control range. However, when the amplitude, speed, etc. of the disturbance exceeds the design values, the high-voltage power supply system cannot respond timely and accurately to ensure the voltage control precision, so that the control requirement of the load cannot be met.
The feedback control speed of the system depends on the influence of the following three aspects, namely the inherent response time of the system, the operation and control performance of the controller and the switching frequency of the rectification power supply module. Generally, the system response time is basically determined after the design is completed, the speed of the controller is far beyond the regulation speed of the module, and the switching frequency of the rectification power supply module is greatly related to the cost, so the design value is generally selected according to the load requirement, and no large margin exists.
Therefore, if it is desired to solve the problem of too fast or excessive disturbance of the system by continuously increasing the feedback control speed, the rectifier power module is required to have a higher switching frequency, and the difficulty of development increases and the cost increases significantly as the switching frequency increases, and according to estimation, the rectifier module with 1kHz switching capability costs about 50% more than the 100Hz rectifier module. How to realize a novel PSM high-voltage power supply and a feedback control method, which saves cost and improves the adaptability of the system at the same time, and the system can meet the performance requirements under various disturbances is very important.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a PSM high-voltage power supply system and a PSM high-voltage power supply system
A feedback control implementation method.
The invention is realized by the following technical scheme:
the utility model provides a PSM high voltage power supply system, including high-pressure inlet wire unit, high-pressure inlet wire unit establish ties a high-voltage contactor cabinet respectively by two high-voltage circuit breaker cabinets and constitute, a many windings high-voltage isolation transformer is connected respectively to two high-voltage contactor cabinets, many windings high-voltage isolation transformer connects low frequency rectification power module and high frequency rectification power module respectively, is connected to the load after low frequency rectification power module and high frequency rectification power module are all established ties, the number of low frequency rectification power module be Nlf"lf" represents "Low Frequency", and the module numbers are (1 #,2#, … …, N, respectivelylf#) and the number of the high-frequency rectification power supply modules is Nhf"hf" denotes "High Frequency", and the module numbers are (1 #,2#, … …, N)hf#), low frequencyNumber N of rectifier power supply moduleslfAnd the number N of high-frequency rectification power supply moduleshfThe sum of the sums is twice of the number of secondary windings of a single multi-winding high-voltage isolation transformer, and the number N of low-frequency rectification power supply moduleslfAnd the number N of high-frequency rectification power supply moduleshfThe configuration of (a) is generally selected to be 9:1, which can be adjusted accordingly according to the system requirements.
A feedback control implementation method of a PSM high-voltage power supply system (1) firstly presetting an output voltage value VrefOpen loop rise time interval TrOpen loop fall time interval TfClosed loop sampling operation period Ts；
(2) Determining a voltage control margin VΔTheoretically, the voltage control margin of the high-voltage power supply with the PSM structure is half of the output voltage of a single module, namely VsAnd/2, in order to avoid oscillation caused by over-regulation of the system, the value is properly increased on the control, and the value V is takens10, thereby ensuring the stability of the system regulation, then VΔ= Vs/2+ Vs/10= 0.6Vs；
(3) Automatically calculating the number N of the expected starting modules by the program according to X = Vref/ VsX is not an integer, and is rounded off to give N;
(4) according to N-N hf2, obtaining the number of low-frequency modules to be put into operation;
(5) after the PSM high-voltage power supply system receives the starting signal, the PSM high-voltage power supply system is immediately started from the 1# low-frequency module at an interval TrTime is started to (N-N) one by onehfA/2) # low frequency module, and then enters a negative feedback control stage;
(6) in a closed loop sampling period TsWithin time, the system collects feedback sampling values VfdWith a given value of voltage VrefCompared with the prior art, the high-frequency rectification power supply module is operated as follows according to the comparison result: increasing, maintaining or reducing, because the number of the high-frequency rectification power supply modules is limited, the regulation range of the high-frequency rectification power supply modules is limited, the 1# high-frequency module is the lower limit, and N ishfHigh frequency module is the upper limit, increasing to NhfAfter # high frequency module, if voltageIf the value is lower than the preset value, the value is still maintained; after the voltage is reduced to the 1# high-frequency module, if the voltage is higher than a preset value, the voltage is still maintained;
(7) after the pulse time arrives, according to the interval time TfAll modules are shut down one by one.
The invention has the advantages that: the invention provides reliable technical support for the stable operation of a 4.6GHz low-clutter system on an EAST nuclear fusion device, replaces low-frequency modules by a certain number of high-frequency modules, well solves the problem of severe disturbance on high-voltage output caused by power grid disturbance during the discharge of the EAST device, greatly shortens the development and debugging period of equipment while saving scientific research expenses, and meets the control requirement of a klystron on voltage precision, thereby finally meeting the requirements of various physical experiments.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a working principle diagram of the present invention.
Fig. 3 is a flowchart of the method for implementing feedback control according to the present invention.
Fig. 4 is a voltage output diagram under normal grid conditions.
Fig. 5 is a graph of voltage output under a grid condition with disturbance (fig. 5a is a global graph of output voltage, and fig. 5b is a partial enlarged graph of output voltage).
Fig. 6 is a graph showing the effect of increasing the feedback control speed on disturbance control (fig. 6a is a global graph of the output voltage, and fig. 6b is a partially enlarged graph of the output voltage).
Fig. 7 is a diagram of the suppression effect of the PSM-structured high-voltage power supply on disturbance (fig. 7a is a global diagram of output voltage, and fig. 7b is a local enlarged diagram of output voltage).
Detailed Description
As shown in figure 1, a PSM high-voltage power supply system comprises a high-voltage wire inlet unit, wherein the high-voltage wire inlet unit is formed by respectively connecting two high-voltage circuit breaker cabinets 1 in series with one high-voltage contactor cabinet 2, the two high-voltage contactor cabinets 2 are respectively connected with a multi-winding high-voltage isolation transformer 3, and the multi-winding high-voltage isolation transformer 3 is respectively connected with a low-frequency rectification power supply module 4 and a high-frequency rectification power supply module 3The power supply module 5, the low frequency rectification power supply module and the high frequency rectification power supply module are all connected in series and then connected to the load 6, and the number of the low frequency rectification power supply modules is Nlf"lf" represents "Low Frequency", and the module numbers are (1 #,2#, … …, N, respectivelylf#) and the number of the high-frequency rectification power supply modules is Nhf"hf" denotes "High Frequency", and the module numbers are (1 #,2#, … …, N)hf#), number of low frequency rectified power supply modules NlfAnd the number N of high-frequency rectification power supply moduleshfThe sum of the sums is twice of the number of secondary windings of a single multi-winding high-voltage isolation transformer, and the number N of low-frequency rectification power supply moduleslfAnd the number N of high-frequency rectification power supply moduleshfThe configuration of (a) is generally selected to be 9:1, which can be adjusted accordingly according to the system requirements.
As shown in fig. 3, a method for implementing feedback control of a PSM high-voltage power supply system (1) first presets an output voltage value VrefOpen loop rise time interval TrOpen loop fall time interval TfClosed loop sampling operation period Ts；
(2) Determining a voltage control margin VΔTheoretically, the voltage control margin of the high-voltage power supply with the PSM structure is half of the output voltage of a single module, namely VsAnd/2, in order to avoid oscillation caused by over-regulation of the system, the value is properly increased on the control, and the value V is takens10, thereby ensuring the stability of the system regulation, then VΔ= Vs/2+ Vs/10= 0.6Vs；
(3) Automatically calculating the number N of the expected starting modules by the program according to X = Vref/ VsX is not an integer, and is rounded off to give N;
(4) according to N-N hf2, obtaining the number of low-frequency modules to be put into operation;
(5) after the PSM high-voltage power supply system receives the starting signal, the PSM high-voltage power supply system is immediately started from the 1# low-frequency module at an interval TrTime is started to (N-N) one by onehfA/2) # low frequency module, and then enters a negative feedback control stage;
(6) in thatA closed loop sampling period TsWithin time, the system collects feedback sampling values VfdWith a given value of voltage VrefCompared with the prior art, the high-frequency rectification power supply module is operated as follows according to the comparison result: increasing, maintaining or reducing, because the number of the high-frequency rectification power supply modules is limited, the regulation range of the high-frequency rectification power supply modules is limited, the 1# high-frequency module is the lower limit, and N ishfHigh frequency module is the upper limit, increasing to NhfAfter # high frequency module, if the voltage is lower than the preset value, still keeping; after the voltage is reduced to the 1# high-frequency module, if the voltage is higher than a preset value, the voltage is still maintained;
(7) after the pulse time arrives, according to the interval time TfAll modules are shut down one by one.
The input and output characteristics of the low frequency module and the high frequency module are the same, i.e. the input voltage and the output voltage are the same, and the difference is only the highest switching frequency, and the highest switching frequency of the two modules can be different by more than 10 times in design, for example, the highest switching frequency of the low frequency module is designed to be 100Hz, and the highest switching frequency of the high frequency module can be designed to be 1kHz or even higher. The working process is shown in fig. 2.
The low-frequency module is used for establishing high voltage at the bottom, the high-frequency module is used for realizing the quick adjustment of the system, and when the system has larger or faster disturbance, the quick adjustment capability of the high-frequency module is utilized to restrain the large-range fluctuation of the output voltage. At the initial stage of system design, can confirm the approximate scope of disturbance according to experimental conditions to confirm the configuration of low frequency module and high frequency module quantity, even if find can't satisfy the suppression to the disturbance after system development is accomplished, also can improve the regulating power of system through the mode of high frequency module replacement low frequency module, because low frequency module and high frequency module input/output characteristic are unanimous, consequently can directly replace on hardware, be equipped with corresponding software upgrade simultaneously, can satisfy the new demand of system, this method is convenient, it is nimble, it is swift, can practice thrift a large amount of time and economic cost.
In an EAST device 4.6GHz low-noise high-voltage power supply system, the novel PSM high-voltage power supply and the feedback control system are developed successfully and put into operation, a single set of power supply system adopts 58 low-frequency modules and 6 high-frequency modules, the input voltage of the low-frequency modules and the input voltage of the high-frequency modules are both 600VAC, the output voltage of the high-frequency modules and the output voltage of the high-frequency modules are both 800VDC, and the control precision of the system voltage. The problem that the voltage output performance can not be improved due to the fact that the feedback control speed cannot be further improved due to the limitation of the switching frequency is well solved.
FIG. 4 shows the voltage setpoint VrefAnd the output voltage waveform with the pulse width of T =200mS is 25kV, and the output voltage fluctuation is small under the condition that the power grid has no disturbance, so that the design requirement of < 1% is met.
Shown in fig. 5a (global graph of output voltage) and fig. 5b (partially enlarged graph of output voltage), the given voltage value V is givenrefThe output voltage waveform of =25kV, the pulse width T =7S and the closed-loop sampling operation period Ts =5mS, and as can be seen from the waveform, the peak-to-peak value of the voltage output waveform is up to 4000V due to the disturbance of the power grid.
The voltage set-point V is given as shown in fig. 6a (global graph of output voltage) and fig. 6b (partial enlarged graph of output voltage)refThe output voltage waveform of =2mS, the pulse width T =7S, and the closed-loop sampling operation period Ts =30kV, it can be seen from the waveform that, under the condition of a disturbed power grid, the voltage peak-to-peak value is reduced to 2000V after the feedback control speed is increased, and is reduced by nearly half compared with fig. 5. However, due to the limitation of the switching frequency of the module, the control effect cannot be further improved by increasing the feedback control speed.
In the novel PSM high-voltage power supply and the feedback control system, on one hand, the feedback control speed is improved, on the other hand, the switching frequency of partial modules is improved to 1kHz, and the voltage output waveforms are shown in fig. 7a (an output voltage global graph) and fig. 7b (an output voltage local enlarged graph). Wherein the given voltage value VrefThe pulse width T =7S and the closed-loop sampling operation period Ts =500uS, and as can be seen from the waveforms, under the condition of a disturbed power grid, the peak-to-peak voltage value reaches 1400V at most, and the dense envelope curve is mainly limited within the range of +/-400V of the given voltage value.
Claims (1)
1. Inverse of PSM high-voltage power supply systemThe feed control implementation method is characterized in that the PSM high-voltage power supply system comprises a high-voltage wire inlet unit, the high-voltage wire inlet unit is formed by respectively connecting two high-voltage circuit breaker cabinets in series with a high-voltage contactor cabinet, the two high-voltage contactor cabinets are respectively connected with a multi-winding high-voltage isolation transformer, the multi-winding high-voltage isolation transformer is respectively connected with a low-frequency rectification power supply module and a high-frequency rectification power supply module, the low-frequency rectification power supply module and the high-frequency rectification power supply module are connected to a load after being connected in series, and the number of the low-frequency rectification power supply modules islfThe number of the high-frequency rectification power supply modules is NhfNumber N of low-frequency rectification power supply moduleslfAnd the number N of high-frequency rectification power supply moduleshfThe sum of the sums is twice of the number of secondary windings of a single multi-winding high-voltage isolation transformer, and the number N of low-frequency rectification power supply moduleslfAnd the number N of high-frequency rectification power supply moduleshfThe configuration ratio of (A) to (B) is 9: 1;
the method for realizing the feedback control of the PSM high-voltage power supply system comprises the following specific steps:
(1) firstly, an output voltage value V is presetrefOpen loop rise time interval TrOpen loop fall time interval TfClosed loop sampling operation period Ts；
(2) Determining a voltage control margin VΔTheoretically, the voltage control margin of the high-voltage power supply with the PSM structure is half of the output voltage of a single module, namely VsAnd/2, in order to avoid oscillation caused by over-regulation of the system, the value is properly increased on the control, and the value V is takens10, thereby ensuring the stability of the system regulation, then VΔ=Vs/2+Vs/10=0.6Vs；
(3) Automatically calculating the number N of the expected starting modules by the program according to X = Vref/VsX is not an integer, and is rounded off to give N;
(4) according to N-Nhf2, obtaining the number of low-frequency rectification power supply modules to be put into operation;
(5) after the PSM high-voltage power supply system receives the starting signal, the PSM high-voltage power supply system is immediately started from the 1# low-frequency rectification power supply module at the interval of Tr timeTurn on one by one to N-NhfA/2 # low-frequency rectification power supply module enters a negative feedback control stage;
(6) in a closed loop sampling period TsWithin time, the system collects feedback sampling values VfdAnd the output voltage value VrefCompared with the prior art, the high-frequency rectification power supply module is operated as follows according to the comparison result: increasing, maintaining or reducing, because the number of the high-frequency rectifying power supply modules is limited, the adjusting range of the high-frequency rectifying power supply modules is limited to a certain extent, the 1# high-frequency rectifying power supply module is the lower limit, and N ishfThe # high-frequency rectification power supply module is taken as the upper limit and is increased to NhfAfter # high-frequency rectification power supply module, if the voltage is lower than the preset value, the voltage is still maintained; after the voltage is reduced to the 1# high-frequency rectification power supply module, if the voltage is higher than a preset value, the voltage is still maintained;
(7) after the pulse time arrives, according to the interval time TfAll modules are shut down one by one.
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| CN107241025A (en) * | 2017-07-17 | 2017-10-10 | 华中科技大学 | A kind of high voltage power supply |
| CN108063500B (en) * | 2017-12-07 | 2023-06-02 | 华电福新能源股份有限公司古田溪水力发电厂 | Magnetic resonance non-contact power supply system and method for on-line monitoring wireless sensor |
| CN112532070A (en) * | 2020-11-26 | 2021-03-19 | 核工业西南物理研究院 | Power supply circuit for PSM high-voltage power supply control and application thereof |
| CN112532082B (en) * | 2020-11-26 | 2021-11-16 | 核工业西南物理研究院 | High-frequency converter applied to PSM high-voltage power supply and PSM high-voltage power supply |
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