Method for identification of emergency modes of functioning of width-pulse energy converters in real-time mode

FIELD: electricity.

SUBSTANCE: dynamic process is represented in the form of an ensemble of harmonics, every of which is a time row reflecting in a symbolic form the dynamics of the appropriate frequency component, stationarity of the process is identified from the moment, when in a continuous selection of values of the first harmonics 5% of these values are outside the range from zero to maximum value of this harmonic, and 95% of these values are inside this interval, for the stationary process by a combination of symbolic characteristics of all harmonics its type is calculated within a scenario of multiple increase of the period.

EFFECT: higher extent of algorithmisation of a process of identification of emergency modes of width-pulse converters of energy, aimed at practical application for higher reliability and safety of their functioning.

 

The proposed method relates to electrical engineering, and in particular to methods of control pulse DC-DC converters, which are widely used as sources of secondary power a variety of devices, the method can be used to identify regimes in the operation of these devices.

Known way to control the pulse Converter DC voltage stabilization of the limiting current, whereby the output PWM control signal regulating element transducer receive as a result of a conjunction of two PWM signals, the first of which form the basis of the error signal voltage, and the second - on the basis of the error signal current. The level of the error signal current is adjusted depending on the values of the demodulated output PWM control signal regulating element [1].

The disadvantage of this method is that it allows you to identify only the average value of the stabilized voltage, which is one of the components that characterize emergency mode operation of the Converter, respectively, based on this identification stabilization cannot guarantee the exclusion of these modes.

Known way to control the pulse stabilizatio the current according to which measure the current value of the stabilized voltage, compare it with the specified value, generate a PWM signal to control the inverter transforms the AC voltage from the inverter output, rectify and smooth the output current [2].

The disadvantage of this method is that it allows you to transform DC to identify only its amplitude, which is one of the components that characterize emergency mode operation of the Converter, respectively, based on this identification stabilization cannot completely guarantee the exception of emergency conditions.

There are emergency modes of operation pulse Converter, when there is a change in both frequency and pulse characteristics operating mode that causes the most significant negative consequences for both the Converter and its associated systems. Data source emergency modes are nonlinear phenomena [3], in which after the so-called bifurcation implement various scenarios of evolution of the dynamics. Analysis of the disadvantages of both methods allows to conclude that their main reason is related to the use of traditional models of pulse Converter [4], in which the display of nonlinear phenomena in principle excluded from R is smotriny.

Closest to the invention by the technical nature of a fractal method of identifying the dynamics [5], according to which a dynamic process is represented in the form of an ensemble of harmonics, each of which is a time series that shows in symbolic form the dynamics of the corresponding frequency component, then at the stage of a stationary process on the combination of symbolic characteristics of all harmonics is computed type stationary process under scenario fold increase period.

In particular, for PWM converters are the most typical scenario of the evolution of the dynamics associated with the transition to chaos via period doubling 1-2-4-... [3]. Variant implementation of the method [5] to recognize the first three periodic processes in the scenario 1-2-4... proposed utility model [6]. In this model, a dynamic process (as a time series over-current) is presented in the form of an ensemble of three harmonics. Harmonica is denoted w<m>where m is the multiplicity of the period of the harmonics of the PWM period (the period of the operational process) and its k-th element is calculated using the expression:

where- the value of the state variable current at the moment of changing the pulse function with a "0" to "1" (the beginning of the leading edge of the pulse function). On stage the number of main telephone the stationary process based on the combination of symbolic characteristics of all three harmonics is computed type stationary process in the scenario period doubling 1-2-4-... according to the following formula:

where r is the number of harmonics in the ensemble, the values of the elements are constant and different from zero. This authentication method is adopted for the prototype.

In the prototype takes into account the nonlinear properties of the pulse method of energy conversion. A special form of representation of the dynamic process clearly shows the quality changes during this process, in particular properties such as stationarity, frequency response, etc. the Process of discernment is clear for use during visual analysis of the person. However, there is no logically grounded formal rule of recognition of the concepts of "transition" and "stationary process". This disadvantage makes it difficult to algorithmization of the identification process and prevents the increase of management efficiency, respectively, reduces the reliability and safety of operation of PWM converters.

An object of the invention is to increase the degree of algorithmic process identification emergency modes pulse width energy converters aimed at practical application to improve the reliability and safety of their operation.

To illustrate the solution of the problem consider the most important from the practical the Russian point of view. As in scenario 1-2-4-... operational mode after the first bifurcation becomes an emergency, it is sufficient to determine was whether this first bifurcation or not. In other words, it is enough to distinguish: after the transition (figa) was established operational mode PWM period (next, 1-process figb) or emergency mode with double the period (hereinafter, 2-process figv). In the framework of the method of identification [5] this means: if after the transition process has been 1-process, its symbolic characteristic "0""0" (figa)if after the transition process has been 2-process, its symbolic feature "w<1>""0" (figb). At figa,b harmonic convergence to zero is detected visually.

However, traditionally used to determine the moment of the conclusion of the transitional process according to control theory (the point at which the signal at the output of the Converter does not leave a "corridor" of values, limited xmouth±Δ, where xmouth- average steady-state value of the signal, Δ is permissible ripple in % relative to the xmouthcannot be used to identify the considered emergency processes because of formal reasons. First, this definition is formulated for the case when the initial conditions I have are zero, however, most of the time the Converter operates with the initial conditions, is significantly different from zero. Second, this definition is formulated for the output signal of the Converter, and not for the transformed time series current throttle - as required according to the method of identification

[5]. In particular, for a PWM Converter, stabilizing the voltage, it turns out that the duration of the transitional process control theory should be judged on the time series values of the output voltage and not on the time series of the current in the power circuit.

In the proposed method for solving this problem is proposed the following model. Note that in practical application fully defined all possible stationary process values only for the first harmonic, it can be zero ("0") and non-zero ("w<1>"). In the nontrivial case, its maximum value is limited by the maximum ripple 2-process (, pigv), and can be determined in advance. At the same time, second harmonic, and for 1-and 2-the process remains the only zero. We assume that the transition process would introduce some uncertainty in the system state, and then this condition will be considered as a stationary process with probability" (figa) the Magnitude of this probability will take practice equal to 95% (rounding 94,45%). This probability is traditionally used in statistics as applied to technical systems as the probability of the normal distribution for the case of falling into the range of "2 Sigma". Then formulate the following rule for determining the moment of transition: the state of the system is established stationary process when 5% of the elements of the time series of the first harmonics fall outside the interval [0,], a 95% of these elements are within the specified interval (high).

The essence of the claimed method of identification emergency modes of operation of the pulse energy converters in real-time is that after start-up of the Converter in each moment of the opening of the power switch of the Converter is measured instantaneous value of current in its power circuit, the measured value is stored, on the basis of the results determined by the symbolic characteristics of the first and second harmonics of the current signal through the implementation of two sequences of operations are determined by the difference between the last measurement of instantaneous values of current and measurement of instantaneous values of current, previous previous measurement, then the first harmonic is assigned to the symbolic value of "0" or "1" by when the absolute Anania the values obtained difference with a predetermined level of interference in a current signal; is determined by the difference between the last and previous measurements of current, then the second harmonic is assigned to the symbolic value of "0" or "1" by comparing the absolute value of the obtained difference with a predetermined level of interference in a current signal according to the invention additionally by preliminary research using the nonlinear model of the pulse-width of the energy Converter is determined by the maximum allowable number of symbolic values "0" of the second harmonic in the total measurement of the instantaneous current value corresponding to the completion of the transition process, is the total number of measurements of instantaneous values of current and is the total number of symbolic values "0" of the second harmonic, is determined by the number of symbolic meanings "0" of the second harmonic in the total measurement of the instantaneous current value, based on the comparison of the result with its maximum allowable value, it is concluded that the current status of the Converter: if the limit value is not exceeded, then the transition process continues, ongoing measurement and processing of instantaneous values of current; if the limit value is exceeded, then checked the current symbolic value of the first harmonic, in the case of "1" identificeres the emergency mode, in the case of "0" is identified operational mode, then the measurement and processing of the instantaneous values of the current stop and the identification is completed.

Figure 1 shows diagrams explaining the difference between the transition process (a), operational process (b) and the emergency process ().

Figure 2. illustrated examples for visual determination of convergence of the transition to the operating mode and emergency mode (b).

Figure 3 provides an example of numerical experiments that illustrate the implementation of the claimed method of identification for the case of setting the operating mode (1 process). To illustrate the use of synchronized time series of voltage (U) inverter output voltage (a), the time series of the current of the inductor (b), including the enlarged part of the operational mode (), the time series of the first harmonic (g) and second harmonic (d).

Figure 4 shows an example block diagram of a device that implements the claimed method of identification emergency modes. The device has connected in series specifies the device 1, the comparator 2, the PWM controller 3, the power subsystem 4, the subsystem identification 5, a display 6, while the second output of the power subsystem 4 is connected with the second input of the comparator 2, the second output is THEM regulator 3 is connected to a second input of the subsystem identification 5.

Figure 5 provides an example of numerical experiments that illustrate the implementation of the claimed method of identification for the case of the establishment of emergency operation (2-process). To illustrate the use of synchronized time series of voltage (U) inverter output voltage (a), the time series of the current of the inductor (b), including the enlarged part of the emergency mode (in), the time series of the first harmonic (g) and second harmonic (d).

For implementing the inventive method can be used in the device presented in figure 4. The device operates as follows. The value of the output voltage (UOfrom the power subsystem (figure 4, pos.4) with comparator (figure 4, item 2) is subtracted from the setpoint (UY)set the master device (figure 4, item 1), the generated error signal (δ) is fed to the PWM controller (figure 4, 3), where in accordance with the PWM control signal is formed, which after amplification (KF) affects key element of the power subsystem (figure 4, pos.4). Subsystem identification performs a current measurement of the throttle (I) in the moments of occurrence of the leading edge of the PWM signal (UPWM). Completed k-e measurement of the current of the inductor are buffered on the principle of FIFO queue and calculates the value of the first w<1>and the second w<2>harmony is according to (1). Next, the completion of the transition process in accordance with the rule of the claimed method. After identifying the beginning of a stationary process calculates its type on the combination of symbolic characteristics of the first w<1>and the second w<2>harmonics in accordance with (2). The identification results are presented on the display (figure 4, pos.6) as the Protocol of recognition of three events: "transition", "operating mode" or "emergency mode".

Figure 3, 5 illustrated examples of the application of the inventive method for identifying operational (1 process) and emergency (2 process) modes, respectively. In particular, figa,b time series of current and voltage is illustrated by the convergence of the transition process 1 process when starting with zero initial conditions. The condition of the completion of the transition process is performed through 2,43 μs after the start, and the combination of symbolic characteristics ("0""0") calculates its type - 1 process. Similarly, on figa,b time series of current and voltage is illustrated by the convergence of the transition process to a 2-process when starting with zero initial conditions. The condition of the completion of the transition process is performed through 2,48 μs after the start, and the combination of symbolic characteristics ("0","w<1>"is calculated by the type - 2 process.

T is thus, unlike the prototype, the identification of a stationary process in the proposed method is performed in two stages. At the first stage calculates the time of establishment of the stationary process based on the analysis of one of the harmonics, and in a second step, the combination of symbolic characteristics of both harmonics is computed type steady-state stationary process. The introduction rules for calculating the date of completion of the transition process allows you to fully algorithmization the process of identification emergency mode pulse-width power converters. In practical application, this allows its implementation in real-time and hardware components of a typical microcontroller, since it uses simple mathematical operations. It should be noted that the symbolic description of dynamic processes in the proposed method indicates the absence of its sensitivity to uncertainties in the parameters pulse width converters of energy that takes place during the operation of systems of this class. Thus, the method provides the ability to automatically recognize emergency situations and, thereby, improve the reliability and safety of operation of the pulse energy converters.

Sources of information

1. The way the control pulse p is OBRAZOVATEL DC voltage stabilization limit current [Text]: U.S. Pat. on the way # 2249842, Grew up. Federation: IPC G05F 1/10, G05F 1/66 Spondence, Kghostview, Washinaton, Cvetanov; applicant and patentee of the Federal state unitary enterprise "Scientific-production center "pole": - No. 2003114596/09; Appl. 05.16.2003; publ. 04.10.2005.

2. The method of controlling a pulse current regulator [Text]: U.S. Pat. on the way # 2366067, Grew up. Federation: IPC H02M 3/335 Waimahana, Aigaio, Vnelafaxine; applicant and patentee of the Federal state unitary enterprise Ufa scientific-production enterprise "Zip": - 2008114539/09; Appl. 14.04.2008; publ. 27.08.2009.

3. Banerjee S. Nonlinear phenomena in power electronics: attractors, bifurcations, chaos, and nonlinear control / S.Banerjee, G.Verghese. - New York: IEEE Press, 2001. - 441 p.

4. Meleshin VI continuous linear model of the power unit pulse Converter as the initial design phase of its dynamic properties) / / Elektrichestvo. 2002. No. 10. Ñ.38-43.

5. Bells J.V., Manowska AV Preventive diagnosis scenarios fold change periods in the evolution of the pulse energy converters. Automatics and telemechanics, 2009, No. 7, s-167.

6. Adaptive control pulse voltage Converter [Text]: U.S. Pat. for useful model №88869, Grew up. Federation: IPC H02M 3/02 Yevrokholod, Avionika, Assesmen; applicant and patentee of the Ugra state University the University: - No. 2009128147/22; Appl. 21.07.09; publ. 20.11.2009 (prototype).

The method of identification emergency modes of operation of the pulse energy converters in real-time, is that after start-up of the Converter in each moment of the opening of the power switch of the Converter is measured instantaneous value of current in its power circuit, the measured value is stored, on the basis of the results determined by the symbolic characteristics of the first and second harmonics of the current signal through the implementation of two sequences of operations are determined by the difference between the last measurement of instantaneous values of current and measurement of instantaneous values of current, previous previous measurement, then the first harmonic is assigned to the symbolic value of "0" or "1" by comparing the absolute value of the difference obtained at a predetermined level of interference in a current signal; determines a difference between the last and previous measurements of current, then the second harmonic is assigned to the symbolic value of "0" or "1" by comparing the absolute value of the obtained difference with a predetermined level of interference in a current signal, characterized in that it further by preliminary studies using nonlinear model pulse pulse is LESNOGO the energy Converter is determined by the maximum allowable number of symbolic values "0" of the second harmonic in the total measurements of instantaneous values of current, corresponding to the completion of the transition process, is the total number of measurements of instantaneous values of current and is the total number of symbolic values "0" of the second harmonic, is determined by the number of symbolic values "0" of the second harmonic in the total measurement of the instantaneous current value, based on the comparison of the result with its maximum allowable value, it is concluded that the current status of the Converter: if the limit value is not exceeded, then the transition process continues, ongoing measurement and processing of instantaneous values of current; if the limit value is exceeded, then checked the current symbolic value of the first harmonic, in the case of "1" is identified emergency mode if "0" is identified operational mode, then the measurement and processing of the instantaneous values of the current stop and the identification is completed.



 

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1 dwg

FIELD: protection of strong-current thyristor converters.

SUBSTANCE: value of derived input current of blocking of control pulses is specified by maximal admissible value of input current of converter. Values of input and output currents of converters are controlled as well as derivative of converter's output current. Range of values of switch-off current of high-speed switch is preset on base of range of values of derivative in such a manner that mentioned meaning of derived value belongs to that range. Minimal meaning of output current of switching-off within that range corresponds to maximal value of derivative of output current of converter. Signal for additional blocking of control pulses is introduced when those values of derivatives of output current of converter are achieved, which values correspond to values of mentioned switching-off current that lies lower than mentioned above value of derived value. Control pulses are blocked when admissible value of output current of converter is exceeded or by signal introduced. After signal for additional blocking of control pulses is introduced, high-sped switch is switched off with time delay being equal or bigger than cut-off time of thyristor converter.

EFFECT: improved reliability of operation; higher speed of switch off; elimination of burning of power terminals; reduced hazardous heat and electrodynamic influence of super high currents in case of alarm switch-off.

1 dwg

FIELD: electricity.

SUBSTANCE: in device for converter high-voltage valve condition monitoring, comprising units of high-voltage valve power keys condition monitoring by number of serially connected power keys, each unit of high-voltage valve keys condition monitoring comprises rectifier, resistor, also stabilitron and capacitor are included, connected in parallel to outputs of rectifier, unit of synchronisation, unit of delay and generation of pulses, with according time delays of pulses and key introduced between the second output of rectifier and the second input of optical transmitter arranged in the form of light diode, besides, control input of key is connected via unit of delay and generation of pulses with output of synchronisation unit connected by one input to input of rectifier, and by the second input - to the second output of rectifier, and optical receiver is arranged, for instance in the form of photodiode and is intended for all units of keys condition monitoring.

EFFECT: reduction of consumed power and cost of device, simplification of design, expansion of functional capabilities.

3 cl, 5 dwg

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