TW200931801A - Active ripple suppression strategy and its control method - Google Patents

Abstract

In general, the power conditioner composed of a dc-dc converter and a dc-ac inverter can adopt varied low output dc voltages from clean energies (e. g. , solar photovoltaic, fuel cell, small-scale wind turbine, etc) to transform into suitable ac voltages for the utilization of stand-alone or grid-connected power supplies. However, there are severe voltage/current ripples with twice of output ac frequency in the high-voltage bus. In this situation, the current ripple will react to the output terminal of clean energy through the dc-dc converter so that the power source will sustain extra loads. Although the circuit capability of the power conditioner could be raised to cope with extra loads, this current ripple may shorten the life span of clean energy. The aims of this invention are recited as follows: (1) it alleviates severe low-frequency current ripples in the high-voltage bus and the output terminal of clean energy to further raise the energy utility rate and save the system cost; (2) it improves the shaking current during loading and unloading instant to decrease the current settling time for practical applications with rapid load variations; (3) it promotes the power quality by effectively removing low-frequency ripples, and applies well to arbitrary power conditioner composed of a dc-dc converter and a dc-ac inverter.

Description

200931801 VIII. If there is a chemical formula, please disclose the chemical that best shows the characteristics of the invention. 9. Description of the invention: Technical field of the invention The technical field of the "active chopper suppression strategy and its control method" of the present invention Including the scope of power electronics, DC/DC and DC/AC power conditioners and clean energy technologies, although the invention covers a wide range of technical fields, it mainly uses adaptive estimation and control strategies and uses digital signal processors. It is the core of its central control system, and it has become a fully digital active chopper suppression mechanism by establishing a well-established feedback and drive control interface as an interconnected communication bridge. [Prior Art] In the past 100 years, human science and technology have been growing rapidly, production technology has been continuously improved, and there has been a marked improvement in daily life. However, the growth of the global population is accompanied by the problem of energy use. During the nineteenth century, oil was an important fuel for the emergence of industrial society. In the early 20th century, oil replaced coal as the most important lining in modern times. _The world’s oil production costs oil. The second oil crisis that erupted in the country and in the 1979 and the year 1979 has had a huge impact on the world. In recent years, oil prices have continued to rise and the stock of oil is rapidly decreasing. 'Experts estimate that there will be a supply crisis in the next half century. In the next few years, high oil prices are foreseeable, so the price is low and the amount of reserves is low. Rich coal has gradually recovered its importance. At present, the most used coal is the tank and _ in the power plant, followed by the coking of the original 200931801 coking coal into coke and used in the steel industry. In addition, coal can also be used to produce gasoline, benzene, asphalt and synthetic rubber. Product or by-product. However, when coal and water are mixed, it will produce acidic substances. If it penetrates into the soil, it will pollute nearby rivers or lakes, and the carbon dioxide, sulfur dioxide and ash particles generated after coal combustion will seriously pollute the air. Therefore, the environmental pollution is caused by the use of coal mines. The main drawbacks. In response to the global greenhouse effect of carbon dioxide, countries around the world signed the "Kyoto Protocol" in the Third Conference of States Parties held in Kyoto, Japan in 1997 to regulate the amount of greenhouse gases emitted by humans, and officially in early 2005. Effectively, in order to achieve greenhouse gas reduction, the domestic initial research on nuclear power generation to curb carbon dioxide emissions. However, nuclear power generation safety concerns and pollution problems, there are many controversies in its application. In order to improve the gradual reduction of non-renewable energy capacity and the problems reflected by greenhouse effects, in addition to reducing the waste of existing energy use, the development of new energy sources is an urgent task. Generally, new energy has little impact on the environment, and the pollution caused by air, water or waste is less significant. More importantly, this kind of energy development can be repeated to make it use the characteristics of sustainable development. Energy (Energy) is a new energy source that is valued for sustainable use [1H2]. However, some clean energy sources are low in density and susceptible to seasonal changes or geographical influences. Power electronics and monitoring brain are related to the performance of various electrical products. The competition between the power and the economy and the protection of the environment. Therefore, in the international arena, it is regarded as the second-generation technology in the 20th century industry. The power conditioner DC/DC converter and the AC converter are connected in series [3]–[6] to receive changes in clean energy devices (such as solar panels, fuel cells, small wind power systems, etc.). Low 200931801 The output DC voltage is converted to AC voltage for independent power supply or parallel network according to actual demand. Due to the DC/money converter n action, the high voltage busbar produces twice the voltage chopping of the output AC frequency, and the current also has low frequency chopping. This current chopping will be transmitted to the output side of the clean energy device via the DC/DC converter, causing the device to withstand additional loads. [This way, not only improve the power conditioning H component specifications' for clean energy (eg fuel) In terms of battery), the device also reduces the service life of the device, and it is impossible to improve the clean energy utilization rate. Therefore, while developing a high-efficiency power converter, the low-frequency current wave is not ambiguous. [α-p ]. Reference [7] Proton Exchange Membrane Fuel Cell Stack (PEMFCS) H Impedance Model, and found that low frequency chopping will reduce fuel cell energy supply efficiency, The effective output power is even reduced by a large amount; in addition, reference [8] also mentions that the proton exchange membrane fuel cell has hysteresis for 1 Hz harmonic current, so its performance is susceptible to chopping near this frequency. The influence of the current component causes the stack temperature to rise and the service life to be shortened. ❹ In recent years, many researchers have tried to eliminate current chopping by using passive or active mechanisms. The former utilizes the energy storage components of the low-voltage side and the high-voltage side of the DC/DC converter or designs a suitable inductor-capacitor series resonant circuit to suppress DC. The chopping phenomenon on the busbar [10]-[11], although the above method can achieve better low current chopping, but its main disadvantage is that it requires a relatively large capacitance value to filter out the low frequency signal; in addition, it is generally parallel to DC. When the capacitor on the busbar is operated under chopping voltage, the temperature of the capacitor component is easy to rise, and the Equivalent Series Resistor (ESR) of the capacitor also rises sharply, which not only causes additional power consumption of 200931801, but also reduces the capacitance. The service life [12], so after considering the device space, cost and operational characteristics of the passive components, the passive mechanism has been gradually replaced by the active mechanism. The conventional active mechanism can be divided into two categories: power conditioner internal control method [13]-[14] and external compensator injection method [15]-[16]. In the internal control method of the power conditioner, reference [13] uses the optimized switching mode to control the internal power transistor of the power conditioner. The research results show that the chopper component on the DC busbar can be reduced and the required capacity of the capacitor can be reduced. In [14], the current control loop is added to the original voltage control loop of the power enthalpy regulator, and double loop control is performed. The frequency of the low frequency chopping can be effectively reduced by appropriately adjusting the pole zero position of the loop. However, the internal control method of the power conditioner has its inevitable shortcomings. When it operates under different power regulator architectures, it must re-derive and analyze its corresponding equivalent circuit in order to smoothly perform chopper suppression, for analog control. In the case of the power conditioner architecture, there are missing offline control parameter corrections and passive component replacements. The 卩 compensator injection method is often proposed to be applied to the analogy or digital control system. The external compensation is applied to the contact of the chopper control and the active mechanism circuit can be used to give current. make up. The active current chopper suppression circuit proposed in [15] adopts a bidirectional DC/DC converter on the DC bus, and is equipped with a proportional integral controller to make it have a compensating function. In addition, reference (10) is directed to the slower dynamic response of the fuel cell, and the hysteresis control active current chopper suppression circuit is connected to its output terminal to increase the dynamic output of the system to avoid the continuous wave. The current reacts to the fuel cell end, thereby protecting the life of the fuel cell. The main advantages of the "active money wave suppression and weaving control method" of the present invention are as follows: 1. The "active chopper suppression strategy and its control method" of the present invention is conventionally used by a DC/DC converter and a direct current. The power regulator composed of the AC converter is used to establish an equivalent model, and the active chopper suppression circuit is successfully added to achieve the chopper suppression performance. Therefore, the active chopper suppression circuit of the present invention can be widely connected in any form. The "11"/DC converter and the DC/AC converter constitute a power conditioner. Therefore, the present invention is quite industrially usable. 2. The active chopper suppression strategy and its control method of the present invention are not limited to the conventional commercial power network, and can also be applied to clean energy sources, such as chopper-contaminated power supply devices, which can reduce the chopping component and protect the power supply. The device and the reduction in unit energy costs, the invention is therefore quite novel. 3. The compensation current command estimation mechanism adopted by the "Active Wavelet Suppression Strategy and Its Control Method" in August is a neural network architecture. It can accurately estimate the compensation current control without using any system selection information. The command, compared with the conventional filter estimation method, can still accurately and quickly calculate the precision compensation current control command in the face of changes in system parameters such as load variation, so the present invention is significantly more advanced than the conventional technology. 4. The control method of the full-bridge converter of the present invention is a global sliding mode control method, which is compared with the conventional proportional-integral control method. The private domain sliding control method can still effectively control the output compensation current of the active parallel wave suppression circuit against the fluctuation of the new parameter, and the current suppression performance is obviously improved compared with the conventional technology. U this month month 200931801 Remarks: References [1] S. R. Bull, “Renewable energy today and tomorrow,” Prac. IEEE, vol. 89, no. 8, pp. 1216-1226, 2001.

[2] S. Rahman, “Green power: what is it and where can we find it?/5 IEEE Power Energy Mag., vol. 1, no. 1, pp. 30-37, 2003.

[3] RJ Wai, RY Duan, JD Lee and LW Liu, t4 High-efficiency fuel cell power inverter with soft-switching resonant technique, 5, IEEE Trans. Energy Conversion^ vol. 20, ❹ no. 2, pp. 485- 492, 2005.

[4] R. J. Wai and R. Y. Duan, uHigh-efficiency power conversion for low power fuel cell generation system, IEEE Trans. Power Electron., vol. 20, no. 4, pp. 847-856, 2005.

[5] R. J. Wai, C. Y. Lin, and W. H. Wang, a Novel power control scheme for stand-alone photovoltaic generation system, IEEE International Conference on Industrial Electronics, Control and Instrumentation, 2006, pp. 97-102.

[6] RJ Wai, CY Lin, and YR Chang, “Novel maximum^ maximum-power-extraction algorithm for PMSG wind generation system, IETProc. Electric Power Appl, vol. 1, no. 2, pp. 275-283, 2007 .

[7] W. Choi, PN Enjeti, and JW Howze, ^Development of an equivalent circuit model of a fuel cell to evaluate the effects of inverter ripple current, Proc. of IEEE Applied Power Electronics Conference and Exposition, 2004, pp. 355 -361.

[8] G. Fontes, C. Turpin, R. Saisset, T. Meynard, and S. Astier, “Interactions between fuel cells and power converters 11 200931801 influence of current harmonics on a fuel cell stack/5 Proc. of IEEE Power Electronics Specialists Conference, 2004, pp. 4729-4735.

[9] R. S. Gemmen, “Analysis for the effect of inverter ripple current on fuel cell operating condition, M J. Fluids Eng., vol. 125, no. 3, pp. 576-585, 2003.

[10] M. Schenck, J. S. Lai, and K. Stanton, t4Fuel cell and power conditioning system interactions, Proc. of IEEE Applied Power Electronics Conference^ 2005, pp. 114-120.

[11] K. Harada and S. Nonaka, "FFT analysis of the composite PWM voltage source inverter, w Proc. of Power Conversion Conference, 2002, vol. 3, pp. 1257-1261.

[12] JL Stevens, JS Shaffer, and JT Vandenham, “The service life of large aluminum electrolytic capacitors: effects of construction and application,” Conf. Rec. IEEE-IAS Annu. Meeting, vol. 3, pp. 2493-2499 , 2001.

[13] M. Huber, W. Amrhein, S. Silber, M. Reisinger, G. Knecht, and G. Kastinger, “Ripple current reduction of DC link electrolytic capacitors by switching pattern optimisation,5, Proc. of Power Electronics Specialists Conference, 2005, pp. 1875-1880.

[14] CR Liu and JS Lai, "Low frequency current ripple reduction technique with active control in a fuel cell power system with inverter load/5 IEEE Trans. Power Electron. ^ vol. 22, no. 4, pp. 1429-1436 , 2007.

[15] Y. R. Novaes and I. Barbi, "Low frequency ripple current 12 200931801 elimination in fuel cell systems/* Proc. of Fuel Seminar Special Session on Fuel Cell Power Conditioning, 2003, pp. 21-27.

[16] A. Monti, E. Santi, F. Ponci, D. Franzoni, D. Patterson, and N. Barry, “Fuel cell based domestic power supply-a student project, IEEE Power Electronics Specialists Conference^ 2002, pp. 315-320. SUMMARY OF THE INVENTION The circuit structure of the implementation of the "active chopper suppression strategy and its control method" is as shown in the "first figure". In the figure, 100 is the wearer-equivalent circuit of the DC/DC converter. The main method is to use the DC/DC converter in the front section of the power conditioner busbar for the analysis of the Th6venin's Equivalent Circuit, which includes a Thevenin equivalent voltage source 101(^) and a Devining equivalent resistor 102. Therefore, the Thevenin equivalent circuit can be adapted to any form of DC/DC converter. In the figure, U0 is a bus-bar equivalent circuit, which is composed of a converter terminal equivalent © resistor series connected to a converter terminal equivalent resistor 112W, which can be equivalent to the impedance characteristic of the bus bar. Cai 120 is the Norton's Equivalent Circuit of the DC/AC converter, which mainly analyzes the Norton Equivalent Circuit of the power regulator in the back of the bus. It contains the Norton equivalent current source. 121 (6) and - Norton equivalent resistance 122 (〇, so the two Norton equivalent circuit can be applied to any form of DC / AC converter. In the figure (10) is - active chopper suppression circuit architecture, including - DC source and - DC capacitor 132〇 can be stably supplied to the ship; full-bridge converter (3) 13 200931801 can effectively switch and generate appropriate compensation current, and through an output chopper inductor 134 (Ζβ) and filter inductor equivalent resistance 134 (怂) Appropriate amount of compensation current is supplied to the power regulator busbars in a timely manner, thereby effectively suppressing chopping components on the power regulator busbars, reducing the rated specifications of various components in the power conditioner, and improving power conversion efficiency for clean energy power generation systems. In other words, it can suppress the voltage and current chopping components at the clean energy output end, and improve the clean energy energy utilization rate and its service life. The system control block diagram of the chopper suppression strategy and its control method is shown in the "second diagram". The figure can be divided into power conditioner equivalent blocks with arbitrary DC/DC converters and DC/AC converters. Figure 2〇〇, compensation current control command estimation mechanism 2 (Μ, compensation current control fiber system 2〇2 and active chopper suppression circuit equivalents plus four parts of the 'Nippon Power Naco block diagram 2〇 〇 can be widely used in any form of DC / money conversion ^ and money / AC converter. To facilitate the analysis of current control mechanism and simplify the derivation of the state space equation, this assumption (1) assumes that the full-bridge converter power switch is The conduction loss and shouting loss of the ideal component switch are zero; (2) the tree delays the turn-on and turn-off reaction delay time; (3) the full-bridge converter switching frequency is much larger than the natural frequency and modulation of the system. Solution, so the control signal and input/output voltage can be regarded as fixed values. According to the above assumptions, the state space average green linearization technique for switching the power switch of bipolar sinusoidal pulse width modulation is Analysis After the 'dynamic equation of the whole cycle can be expressed as shown in equation (1): 4 = (1) where the compensation current is injected, q is the duty cycle of each switch cycle and the turn-on duty cycle of 200931801 (Duty Cycle). The period and full-bridge power stage gain heart = B / <, ·, where the compensation current control signal, t is the peak value of the triangular wave signal, the system dynamic model can be rewritten as shown in equation (2). Using equation (2) And the current relationship /; = / 6 + (, where / is the bus current end current and & is the bus converter end current, through Laplace Transform (Laplace Transform) can further represent the equivalent model as shown in Figure 2 The active chopper suppression circuit is shown in the equivalent block diagram 203.

〇

In the above formula, G represents the busbar voltage, and the compensation current control command is obtained by the current of the busbar converter/through the compensation current control command estimation mechanism 201, and the compensation current control command and the active chopper suppression circuit are fed back. After the compensation current ζ·α is subtracted, a compensation current control error can be obtained, and then the compensation current control signal 202 is obtained by the compensation current control mechanism 202, and the active chopper suppression circuit follows the target, and is controlled by the driving circuit. The bridge converter, the driving circuit comprises a comparator 'the comparator can compare the compensation current control signal with a high frequency triangular wave signal' to output a pulse width modulation signal to drive the full bridge converter The power transistor switch 'outputs the compensation current 匕 injected in series with the DC/DC converter and the DC/AC converter is turned off, _ reaches the current chopper suppression 15 200931801 Effect 》 Select the main reduction 涟 抑 路 路 输出 output compensation current ( As the system state and L as the compensation current control signal, equation (2) can be rearranged as follows. x(t) = apx(t) + bpu(t) + cp =αΡΛΟ+bpnu(t)+ [Ααρηχ(ή + jSbpnU{t) + ^ ] Ο) = apnX{t) + bpnU(t) + dp{t) The actual m two ia, a, _RJLa, bp=K_fLa, cis, sum and heart respectively In the normal case, the system parameter of s is called ^ and △~ generation: the parameter deviation of the system parameter; the representative uncertainty is defined as dp^ = ^PnX(t) + Abpnu(t) + Cp (4) and its boundary value is given It is as shown in equation (5), where p is a positive constant. M<p (5) The compensation current control error of the king domain sliding mode control system is defined as O AL ζβ ' where ~=z: represents the compensation current control command, assuming no system parameter changes and external disturbance factors, rewrite the equation (3) The normal state model representing the normal situation is as follows: x^>V(t) + bpnu(t) (6) According to equation (6), the basic model control is designed as

Hh+ν,υ) (7) ”中& is a positive constant. If equation (6) is substituted for human silk (7), the systematic error 16 200931801 can be described as a dynamic selection of 4 values. The equation design obtains the required system performance, but when the system parameters change or external interference is added to the system, the performance specifications held by equation (8) cannot be guaranteed in the case of the basic model control design. In addition, the control will be destroyed. The stability characteristics of the system, so regardless of the presence or absence of system uncertain dynamics, the present invention requires additional design constraints controller 0 to ensure the performance specifications held by equation (8). First, define the sliding plane as follows: 5/ (0 = ^ ( 〇- e. (0) + kx Je,. (τ) dτ (9) where ^(9) is the initial value of e/(7). When the time is zero, the function \(7) is zero; according to equation (8), Knowing the rate of change of the sliding plane can be expressed as meaning that when the time is greater than zero, the function will be zero. It is worth noting that when the time is zero, the function is (7) is zero, that is, the system state is already on the sliding plane at the beginning, 〇 No traditional sliding mode control The imminent phase mode. Considering the unknown system (4) and external interference, the secret equation (3) can be rewritten to ~ Kapn^) = u(t) + b^ndp (〇(11) Obviously, Cheng Rusi The controller of the formula (7) is purely ensuring that the equation (11) can satisfy the basic model control design, so it is necessary to design an additional controller' so that the dynamic performance of the (four) system depends on the basic model control design. The global sliding mode control law is designed as follows: 17 200931801 M=Mfc+Mc (12) where % is as shown in equation (7) and the constraint controller ^ is defined as uc = n sgn(s!(t)) -k2b» (13) ❹ ❹ where sgn(·) is a sign function and the heart is a positive constant. So designing the second controller has two purposes. 'It is to keep the system dynamic on the sliding plane at any time'. Zero, so weigh ~ is the constraint controller; the second is to ensure that the closed-loop dynamic system can be like the performance of the basic control design. Substituting equation (7) and equation (I3) into equation (11) 'the error dynamic equation can be organized into ^ ( 0 = -V,(0 + ^K +b;lndp(t)] (14) S time is The zero-time 'function will be zero. In order to keep the arbitrary system state on the sliding plane, the sliding condition (slidingamditiQn) is as follows: If you are smart, 5/(you (7)<〇(15) equation (9) versus time After subdivision and multiplication with Liu, 'substituting equation (10) into equation (14), we can get the willow, (0=柳>.+柳, c +μ, (·ρ(,)| =-^/2 (〇-|^(〇|[^-|^(〇|] < -k2sf(t) < ο (ΐ6) According to equations (16) and I(10)I<ρ, it is ensured that sliding mode control is ensured during the entire control period. Condition 'step-step guarantee control (four) qualitative; value - mention that the constraint controller can be selected to effectively reduce the compensation current (four) signal jitter phenomenon 0 network "active chopper suppression strategy and its control" Neural network 18 200931801 Compensation current control command estimation mechanism As shown in the "third diagram", the neural network input layer 301 (弋) contains the DC term and the octave harmonics in the Fourier expansion of the chopping analysis. The term 'where' represents the harmonic order and the vulgar represents the basic wave angle frequency, and the neural network weight value corresponding to each of them is 3〇2 (w = [wG wu w12...wnl %2]) After multiplication, the estimated current value can be obtained. The estimated current error e = of the feedback bus current of the feedback bus is compared with this value, especially by the weight adjustment learning method 303 (M^ = material 2 /; ex; ·) Item weight value, where ^ is the weight learning rate, and after learning to adjust the weight value, an accurate DC component weight value von can be obtained, and the feedback current of the bus bar converter will be returned. • The DC component can be removed to obtain an effective compensation current. Control command =- $. [Embodiment] In order to further understand the contents of the present invention, the following analog waveforms, the voltage and current codes of the components, please refer to the first figure; ^, ^ and ^ represent the fixed output power The optimum value of the current bus terminal current ^, bus bar voltage ^ and compensation current control command < In order to verify that the "active chopper suppression strategy and its control method" disclosed in the present invention has the actual effect of excellent chopper suppression, the fourth to sixth figures respectively represent the power adjustment (four) touch 6 different timing compensation current control command evaluation Erni __ with the embodiment, the most, the best embodiment of the ς 发 发 简 系 铺 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿 补偿200931801 Effect. In addition, the seventh figure shows that the preferred embodiment operates at a load variation and still achieves an excellent chopper suppression effect. The fourth figure is an embodiment of the "active chopper suppression strategy and its control method" disclosed in the present invention, which adopts a first-order high-pass filter as a compensation current command estimation mechanism, and cooperates with a conventional proportional integral controller as a compensation current control mechanism. The proportional integral controller includes an adjustable proportional term coefficient, an adjustable integral term coefficient, and an integrator, the adjustable proportional term coefficient and the compensated current control error value ❹ multiplied by the value, plus the adjustable integral term The required product is obtained by multiplying the coefficient by the product of the integral value of the compensating current control error value. First, cg®(a) is the current of the n-terminal current of the g-flow, which has the doubling chopping component of the DC component and the output parent-frequency frequency, and observes the fourth figure (9) and (6) respectively. In general, with the Pai County, the micro-certification of its secret surface wave into a knife in 0.04 seconds; i people have been considerably suppressed after compensating the current. Furthermore, the estimation of the first-order high-pass chopper compensation current control command is as high as the fourth, and it takes about four cycles to achieve the desired degree of estimation, which is attributed to its _ position. The shortcomings of delay. In addition, the injection compensation current of the integral controller and its compensation current control error are as shown in the fourth _ and (〇, there is a considerable error value. In view of the pre-existing first-order high-pass filter, there is an estimated phase delay ^ Disadvantages ^ SJ is called the New Zealand and the difference between the freshness and the freshness (4). The order is not disclosed in this month. The "active chopping suppression strategy and its control method" further proposes the real 20 200931801 yang withering mechanism and matching. The fifth picture (a For the case of sinking, the main reason is that Lai Shen _ Lu is used as a simple electric age estimation mechanism to learn the proportion of the integral as the compensation current control mechanism, and the current of the DC output and the output AC frequency. The wave pollution component, the fifth __ is the bus bar converter terminal power ^ bus bar voltage, it can be secreted each time the wave age is _ 攸 person compensation turbulence

Standard. However, as shown in the fifth (e) and (f), the injection compensation current of the proportional-integral controller and its compensation current control error are still quite large. In order to effectively reduce the injection compensation current control error, the "active chopper suppression strategy and its control method" disclosed in the present invention further proposes an improved embodiment, which replaces the conventional sliding mode controller with the conventional proportional integral controller for the compensation current control mechanism. As shown in the sixth (e) and (f), the global sliding mode controller can effectively reduce the compensation current control error. This global sliding mode controller is matched with a class-like neural network. The excellent compensation current command estimation capability, as shown in the sixth figure (d), can effectively suppress the severe multiplier harmonic current from the busbar converter. Six figures (; a) are shown. The low-frequency chopping phenomenon of the bus and the bus voltage of the busbar has been greatly reduced, as shown in Figures 6(b) and (c). In addition, the "active chopper suppression strategy and its control method" disclosed in the present invention also provides an embodiment for verifying the system robustness as shown in the seventh figure (a), the bus current converter current is at 0. 04 seconds. The regulator output load is loaded from 600W to 21 200931801 lkW. From the seventh diagrams (d), (e) and (f) to verify the load variation, the neural network compensation current command estimation and the global sliding mode control are stable. And not subject to system parameter changes. In terms of the overall effect, it can be known from the seventh and (8) that the frequency-multiplied harmonic components of the busbar switching terminal current and the busbar battery are even under the influence of system parameter fluctuations. Its control method" is effectively suppressed. For the clean energy power generation system, it can effectively reduce the rated specifications of various components of the power conditioner, and improve the rated output power of clean energy. © Reduce the single county, and improve the material _ service life. While the present invention has been described in connection with the preferred embodiments of the present invention, it is not intended to limit the scope of the invention. The scope of protection is subject to the definition of the scope of the patent application attached. [Simple diagram of the diagram] 〇The first diagram shows the equivalent model of the power regulation system with active chopper suppression circuit. The second diagram shows the system control block diagram of the active chopper suppression circuit. The third diagram shows the neural network compensation current. The fourth diagram of the control command estimation mechanism shows the active chopper suppression strategy simulation response of the compensation current control command estimation and compensation current control mechanism using the first-order high-pass filter and the proportional integral controller. Figure 22: Mining neural network Compensating current control command for road and proportional integral controllers The active chopper suppression strategy with compensation current control mechanism simulates the response diagram. The seventh diagram shows the compensation current of the mining neural network and the global sliding mode controller. The command estimation and compensation current control mechanism is applied to the power regulator output load. Active chopper suppression strategy simulation response diagram [main component symbol description] 100: DC/DC converter David Ning equivalent circuit 101: Dai Weining equivalent voltage source 102: Dai Weining equivalent resistance O no: bus bar equivalent circuit 111: bus bar converter terminal equivalent resistance 112: bus bar converter terminal equivalent resistance 120: DC / Norton equivalent circuit of AC converter 12l · Norton equivalent current source 122: Norton equivalent resistance 130: Active chopper suppression circuit architecture 23 200931801 131: DC voltage source 132: DC capacitor 133: full bridge converter 134: Output filter inductor 135: Filter inductor equivalent resistance 200: Power regulator equivalent block diagram with arbitrary DC/DC converter and DC/AC converter Figure 201: Compensation current control command estimation mechanism 202: Compensation current Control mechanism 203: active chopper suppression circuit equivalent block diagram 301: neural network input layer 302: neural network weight value 303: weight adjustment learning rule

twenty four

Claims (1)

200931801 X. Patent application scope: 1. An active chopper suppression strategy and its control method, including: - an active chopper suppression circuit architecture for generating a compensation current; a compensation current control command estimation mechanism, The neural network generates appropriate compensation current control commands; and - compensation current spreading, fine ratio control (4) nuclear control active continuous wave suppression circuit output compensation current, achieving active chopper suppression effect; 〇 神 神, _ pavement The side of the money_command can be based on the feedback of the chopper suppression point, and the operation (4) can be effectively controlled by the compensating current control mechanism with the proportional integral controller to control the output of the active chopper suppression circuit. Compensating the current to the point of implementation to achieve chopping suppression. 2. The active chopper suppression strategy and its control method according to the first application of the patent scope, wherein the active chopper suppression circuit architecture comprises a DC voltage source, a constant electromechanical valley device, a full bridge converter, An output filter inductor and a filter inductor equivalent resistor, the DC voltage source and the DC capacitor are connected in parallel to form a stable compensation energy supply back end of the full bridge converter required compensation current, and then through the output wave inductance The filter inductor equivalent resistance can output the chopper compensation current to be injected. 3. Active chopper suppression strategy and its control method according to item 1 of the patent application scope. The compensation current control command estimation mechanism includes a type of neural network input layer, a type of neural network weight value and a weight adjustment learning rule. The neural network 25 200931801, the network input layer contains the DC term and the spectroscopy wave term in the Fourier expansion of the chopping analysis, and multiplies it by the corresponding weights of the gods, which is the H-estimation measure. The current value; the estimated current error obtained by comparing the current of the brewing converter current with the value can be effectively adjusted by using the weight adjustment learning rule, and the adjustment weight value can be repeatedly obtained to obtain an accurate The DC component weight value is obtained by removing the DC component from the feedback bus current of the feedback bus to obtain an effective compensation current control command. ❹4· According to the application for the first-line silk-type chopping and weaving and its control method, the compensation current control mechanism includes a proportional integral controller and a driving circuit, wherein the proportional integral controller can compensate the injection The compensation current control error after comparing the current with the compensation current control command calculates the required compensation current control signal, and effectively controls the active chopper suppression circuit output compensation current 'to achieve the chopping current suppression effect by the driving circuit. 5. The active chopper suppression strategy according to item 4 of the patent application scope and the control method thereof, wherein the proportional integral controller comprises an adjustable proportional term coefficient, an adjustable integral term coefficient and an integrator, Adjusting the proportional term coefficient and the compensation current control error value multiplication value 'plus the product of the adjustable integral term coefficient and the integral value of the integrator to the compensation current control error value can obtain the required compensation current control signal. 6. The active chopper suppression strategy and its control method according to item 4 of the patent application scope, wherein the driving circuit comprises a comparator, the comparator can compare the compensation current 26 200931801 · the control signal with the high frequency triangular wave signal A pulse width modulation signal is output to drive the power transistor switch of the full bridge converter. 7. An active chopper suppression (four) and its (iv) i method, comprising: an active chopper suppression circuit architecture for generating a compensation current; a compensation current (four) command_mechanism, a fine __ path to generate appropriate compensation current control Command; and - compensation current control mechanism, the global sliding mode control effectively controls the output compensation current of the main-stage chopper suppression circuit to achieve the active chopper suppression effect; the neural network compensation current control command estimation mechanism can be based on To implement the current value of the continuous wave suppression point, the appropriate compensation current control command is calculated, and the compensation current control mechanism with the global sliding mode controller can effectively control the output of the active chopper suppression circuit to the implementation point. Wave suppression effect. 〇 f 解 ( 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动 主动Inductive equivalent resistance, the DC voltage source and the DC capacitor are connected in parallel to form a stable compensation energy supply back end of the full bridge converter required compensation current, and then through the output filter inductor and the filter inductor equivalent resistance Output the chopping compensation current to be injected. 27 200931801 9. Active chopper suppression strategy and its control method according to item 7 of the patent application scope] The compensation current control command estimation mechanism includes a kind of neural network input layer, a kind of neural network weight value and a weight adjustment learning. The law, the neural network input layer includes the DC term and the octave harmonic term in the Fourier expansion of the chopping analysis, and multiplies it by the weight value of the corresponding neural network to obtain the estimation. The current value; the compensation current estimation error obtained by comparing the feedback current of the bus current converter terminal with the value can be adjusted by using the weight adjustment learning rule to adjust the weight value repeatedly and then learning the adjustment weight value repeatedly A precise DC component weight value is obtained, and the DC component is removed from the feedback bus current of the feedback bus to obtain an effective compensation current control command. 10. The active chopper suppression strategy and its control method according to item 7 of the patent application scope, wherein the compensation current control mechanism comprises a global sliding mode controller and a driving circuit 'even if the bus bar converter ends the chopping factor When the power regulator load changes, the global sliding mode controller can still generate a compensation current control signal against the system parameter variation, and effectively control the active chopper suppression circuit to output the compensation current through the driving circuit to achieve chopping. Current suppression efficiency. 11. The active chopper suppression strategy and control method thereof according to claim 10, wherein the global sliding mode controller comprises a basic model controller and a constraint controller, wherein the basic model controller can clearly plan the normal situation The desired system performance; the constraint controller that eliminates the unpredictable disturbance effects from system parameter changes, load disturbance voltage currents, and unpatterned system dynamics. The control process does not have an impending phase mode and all states 28 200931801 Both of them are on the sliding plane, and the influence of the uncertainty is not affected by the whole process of the whole chick's stroke, and the compensation current control signal chattering phenomenon can be effectively reduced. 12. The active chopper suppression strategy and control method thereof according to claim 10, wherein the driving circuit comprises a comparator, the comparator can compare the compensation current control signal with a high frequency triangular wave signal, and output one The pulse width modulation signal is used to drive the power transistor switch of the full bridge converter. ❹ Ο 29