CN1116731C - Method and device for suppressing ripples for high-power DC power supply - Google Patents
Method and device for suppressing ripples for high-power DC power supply Download PDFInfo
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- CN1116731C CN1116731C CN 00135473 CN00135473A CN1116731C CN 1116731 C CN1116731 C CN 1116731C CN 00135473 CN00135473 CN 00135473 CN 00135473 A CN00135473 A CN 00135473A CN 1116731 C CN1116731 C CN 1116731C
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Abstract
一种用于抑制大功率直流电源纹波的方法及装置，它包括一相控整流器，其输出端与无源滤波器的输入端相连，直流有源滤波器与负载并联联接，并且与无源滤波器输出端并联连接，从直流有源滤波器输入的信号Uab通过检测电路输入到低通滤波器和减法器将纹波电压从直流中分离出来，经比例放大器放大，经跟踪控制电路产生PWM信号，使逆变器放大产生相应的纹波电流信号，结果使直流回路中的纹波电流分流，达到抑制直流回路纹波电流或电压的目的。
A method and device for suppressing high-power DC power supply ripple, which includes a phase-controlled rectifier, the output of which is connected to the input of a passive filter, the DC active filter is connected in parallel with a load, and connected to a passive The output terminals of the filters are connected in parallel, and the signal U ab input from the DC active filter is input to the low-pass filter and the subtractor through the detection circuit to separate the ripple voltage from the DC, amplified by the proportional amplifier, and generated by the tracking control circuit The PWM signal enables the inverter to amplify and generate a corresponding ripple current signal. As a result, the ripple current in the DC circuit is shunted to achieve the purpose of suppressing the ripple current or voltage of the DC circuit.
Description
本发明属于电工技术领域，更进一步涉及一种用于抑制大功率直流电源纹波的方法及装置。The invention belongs to the field of electrical technology, and further relates to a method and device for suppressing ripples of high-power DC power supplies.
在高能物理研究中的质子同步加速器、核磁共振装置中的磁体以及超导电工技术的研究中，通常需要用大电流的稳流电源对磁体供给励磁电流，这些应用中都对磁场的稳定度提出要求。要保证磁场的长期稳定，就是要保证稳定电源的输出电流具有很高的稳定度和极低的纹波。核物理研究的重粒子加速器系统中的快速脉冲电源，其电流必须精确地跟随由计算机给出的电流脉冲模式。这些应用不仅要求极低的电流纹波而且需要快速的响应。In the study of proton synchrotrons in high-energy physics research, magnets in nuclear magnetic resonance devices, and superconducting engineering technology, it is usually necessary to use a large-current steady-current power supply to supply excitation current to the magnets. In these applications, the stability of the magnetic field is proposed. Require. To ensure the long-term stability of the magnetic field, it is necessary to ensure that the output current of the stable power supply has high stability and extremely low ripple. For the fast pulse power supply in the heavy particle accelerator system of nuclear physics research, its current must accurately follow the current pulse mode given by the computer. These applications require not only extremely low current ripple but also fast response.
目前，直流稳定电源和脉冲电源的功率越来越大，从几百千瓦到上万千瓦，相控整流电源仍然是大功率稳定电源(如磁铁负载)应用的优先选择。为了满足严格的输出纹波要求，通常采用无源滤波器和由串联线性调整电路构成的有源滤波器消除相控整流电源的输出纹波。无源滤波器体积庞大，而且较大的无源滤波器将使系统的动态性能和过渡过程中的跟踪精度恶化。串联线性调整型有源滤波器与负载串联连接，可以达到高稳定、低纹波、低噪声等较高的质量指标要求，但串联调整管(大功率晶体管)的电流容量和线性放大倍数均有限，串联调整管往往由数百个大功率晶体管组成，管压降造成的损耗较大。对于大功率稳定电源，降低损耗问题是一个不可忽视的问题。At present, the power of DC stable power supply and pulse power supply is increasing, from hundreds of kilowatts to tens of thousands of kilowatts, phase-controlled rectification power supply is still the preferred choice for high-power stable power supply (such as magnet load) applications. In order to meet the strict output ripple requirements, passive filters and active filters composed of series linear adjustment circuits are usually used to eliminate the output ripple of the phase-controlled rectified power supply. Passive filters are bulky, and larger passive filters will degrade the system's dynamic performance and tracking accuracy during transitions. The series linear adjustment active filter is connected in series with the load, which can meet high quality index requirements such as high stability, low ripple, and low noise, but the current capacity and linear magnification of the series adjustment tube (high-power transistor) are limited. , The series adjustment tube is often composed of hundreds of high-power transistors, and the loss caused by the voltage drop of the tube is relatively large. For high-power stable power supply, the problem of reducing loss is a problem that cannot be ignored.
本发明的目的提出了一种采用PWM(脉冲宽度调制)技术控制的并联联接的直流有源滤波器与无源滤波器构成混合型滤波器的结构，采用检测纹波电压的控制方法，使大功率直流稳定电源或脉冲电源的电流纹波达到10ppm(10-5)以下，同时也提高了直流稳定电源的稳定度。The purpose of the present invention proposes a structure in which the DC active filter and the passive filter connected in parallel connected by PWM (pulse width modulation) technology are used to form a hybrid filter, and the control method for detecting ripple voltage is adopted to make large The current ripple of the power DC stabilized power supply or the pulse power supply is below 10ppm (10 -5 ), and the stability of the DC stabilized power supply is also improved.
为达到上述目的，本发明的技术方案是：它包括一相控整流器，相控整流器的输出端与无源滤波器的输入端并联相连，无源滤波器的输出端与有源滤波器的输入端并联连接，有源滤波器的输出端与负载并联连接；To achieve the above object, the technical solution of the present invention is: it comprises a phase-controlled rectifier, the output end of the phase-controlled rectifier is connected in parallel with the input end of the passive filter, and the output end of the passive filter is connected with the input end of the active filter. The terminals are connected in parallel, and the output terminal of the active filter is connected in parallel with the load;
有源滤波器控制电路包括一检测电路，检测电路分别接在低通滤波器的输入端和减法器的负输入端，低通滤波器的输出端接减法器的正输入端，减法器的输出端接比例放大器的输入端，比例放大器的输出端接PWM跟踪控制器的输入端，PWM跟踪控制器的输出端接到电压型逆变器的输入端，在PWM跟踪控制器中接有保护器。The active filter control circuit includes a detection circuit, the detection circuit is respectively connected to the input end of the low-pass filter and the negative input end of the subtractor, the output end of the low-pass filter is connected to the positive input end of the subtractor, and the output of the subtractor The terminal is connected to the input terminal of the proportional amplifier, the output terminal of the proportional amplifier is connected to the input terminal of the PWM tracking controller, the output terminal of the PWM tracking controller is connected to the input terminal of the voltage source inverter, and a protector is connected to the PWM tracking controller .
并联有源滤波器检测抑制直流电源纹波电压的方法是：首先用检测器检测有源滤波器的a、b两端电压Uab，然后输入到低通滤波器，经低通滤波器和减法器将纹波电压从直流中分离出来，其次，将纹波电压用比例放大器放大，作为指令信号，再次，将指令信号经跟踪控制器产生PWM信号，使逆变器放大产生相应的纹波电流信号即可。The method for detecting and suppressing the ripple voltage of the DC power supply by connecting the active filter in parallel is: first use the detector to detect the voltage U ab at both ends of a and b of the active filter, then input it to the low-pass filter, and pass the low-pass filter and subtraction The inverter separates the ripple voltage from the direct current. Secondly, the ripple voltage is amplified by a proportional amplifier as a command signal. Thirdly, the command signal is generated by the tracking controller to generate a PWM signal, so that the inverter is amplified to generate a corresponding ripple current. signal.
下面结合附图对本发明做进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings.
图1是本发明的整体结构示意图。Fig. 1 is a schematic diagram of the overall structure of the present invention.
图2是本发明的并联有源滤波器控制电路方框图。Fig. 2 is a block diagram of the parallel active filter control circuit of the present invention.
参见图1，它包括一相控整流器1，相控整流器1的输出端与无源滤波器2的输入端并联相连，无源滤波器2的输出端与有源滤波器3的输入端并联连接，有源滤波器3的输出端与负载4并联连接；无源滤波器2包括一相串联的电容Cd、及电阻Rd，串联的电容Cd、及电阻Rd又与电容Cr相并联，并与电感LS相串联；有源滤波器3包括电感LA，电感LA与单相电压桥式PWM逆变器5相串联后并入电路，电路上还并联有控制电路6，且控制电路6的输出端又与单相电压桥式PWM逆变器5的输入端连接；负载4由电感LL和电阻RL串联连接。Referring to Fig. 1, it includes a phase-controlled rectifier 1, the output terminal of the phase-controlled rectifier 1 is connected in parallel with the input terminal of the passive filter 2, and the output terminal of the passive filter 2 is connected in parallel with the input terminal of the active filter 3 , the output terminal of the active filter 3 is connected in parallel with the load 4; the passive filter 2 includes a capacitor C d and a resistor R d in series, and the capacitor C d and the resistor R d in series are in phase with the capacitor C r connected in parallel and connected in series with the inductance L S ; the active filter 3 includes the inductance L A , and the inductance L A is connected in series with the single-phase voltage bridge PWM inverter 5 and then incorporated into the circuit, and the circuit is also connected in parallel with a control circuit 6, And the output terminal of the control circuit 6 is connected with the input terminal of the single-phase voltage bridge PWM inverter 5; the load 4 is connected in series by an inductor L L and a resistor R L.
其工作原理是：相控整流器1的输出纹波首先经过无源滤波器2滤波得到衰减，再经过有源滤波器3使负载端纹波得到进一步得到抑制和衰减，满足负载4低纹波的要求。Its working principle is: the output ripple of the phase-controlled rectifier 1 is first filtered by the passive filter 2 to be attenuated, and then the ripple at the load end is further suppressed and attenuated by the active filter 3 to meet the requirements of the low ripple of the load 4. Require.
参见图2，有源滤波器控制电路6由含有传感器的检测器7、低通滤波器8、减法器9、比例放大器10、PWM跟踪控制器11、保护器12组成，它们之间的连接关系是：有源滤波器控制电路6的输入端通过检测电路7分别接在低通滤波器8的输入端和减法器9的负输入端，低通滤波器8的输出端接减法器9的正输入端，减法器9的输出端接比例放大器10的输入端，比例放大器10的输出端接PWM跟踪控制器11的输入端，PWM跟踪控制器11的输出端接到电压型逆变器5的输入端，在PWM跟踪控制器11中接有保护器12；其检测抑制直流电源纹波电压的方法是：首先用检测器7检测有源滤波器3的a、b两端电压Uab(内含直流和纹波成分)，然后输入到低通滤波器8，经低通滤波器8和减法器9将纹波电压从直流中分离出来，其次，将纹波电压用比例放大器10放大，作为指令信号，再次，将指令信号经跟踪控制电路11产生PWM信号，使逆变器5放大产生相应的纹波电流信号即可。通过以上方法，使直流回路中的纹波电流分流，达到抑制直流回路纹波电流或电压的目的。Referring to Fig. 2, the active filter control circuit 6 is composed of a sensor-containing detector 7, a low-pass filter 8, a subtractor 9, a proportional amplifier 10, a PWM tracking controller 11, and a protector 12. The connection relationship between them Yes: the input terminal of the active filter control circuit 6 is respectively connected to the input terminal of the low-pass filter 8 and the negative input terminal of the subtractor 9 through the detection circuit 7, and the output terminal of the low-pass filter 8 is connected to the positive terminal of the subtractor 9. The input terminal, the output terminal of the subtractor 9 is connected to the input terminal of the proportional amplifier 10, the output terminal of the proportional amplifier 10 is connected to the input terminal of the PWM tracking controller 11, and the output terminal of the PWM tracking controller 11 is connected to the voltage source inverter 5 The input terminal is connected with a protector 12 in the PWM tracking controller 11; the method for detecting and suppressing the ripple voltage of the DC power supply is: at first detecting the voltage U ab (internal Contains DC and ripple components), then input to the low-pass filter 8, the ripple voltage is separated from the DC through the low-pass filter 8 and the subtractor 9, and secondly, the ripple voltage is amplified with a proportional amplifier 10, as As for the command signal, once again, the command signal is generated by the tracking control circuit 11 to generate a PWM signal, so that the inverter 5 is amplified to generate a corresponding ripple current signal. Through the above method, the ripple current in the DC circuit is shunted to achieve the purpose of suppressing the ripple current or voltage of the DC circuit.
本发明提出的一种并联联接的直流有源滤波器与无源滤波器构成混合型滤波器结构，并且采用检测纹波电压的控制方法，利用PWM技术，在装置成本非常低的情况下，可以非常容易地获得很好的滤波效果，使大功率直流稳定电源的电流纹波达到10ppm以下，同时也提高了直流稳定电源的稳定度。特别是发明了采用检测纹波电压的控制方法，该方法的显著优点是：对传感器和电路元件精度要求不高的情况下，很容易实现直流稳定电源的低纹波要求。该方法容易实现，装置损耗小，效率高，工作稳定、可靠，在高能物理、超导研究方面所需的大功率直流稳流电源和脉冲电源中具有广阔的应用前景。The present invention proposes a parallel connection DC active filter and a passive filter to form a hybrid filter structure, and adopts a control method for detecting ripple voltage and utilizes PWM technology. It is very easy to obtain a good filtering effect, so that the current ripple of the high-power DC stabilized power supply is below 10ppm, and the stability of the DC stabilized power supply is also improved. In particular, the control method of detecting ripple voltage was invented. The significant advantage of this method is that it is easy to achieve the low ripple requirement of DC stable power supply when the accuracy of sensors and circuit components is not high. The method is easy to implement, has low device loss, high efficiency, stable and reliable operation, and has broad application prospects in high-power DC steady-current power supplies and pulse power supplies required in high-energy physics and superconducting research.
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| CN 00135473 CN1116731C (en) | 2000-12-28 | 2000-12-28 | Method and device for suppressing ripples for high-power DC power supply |
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| CN 00135473 CN1116731C (en) | 2000-12-28 | 2000-12-28 | Method and device for suppressing ripples for high-power DC power supply |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1421987B (en) * | 2001-11-22 | 2010-06-16 | 台达电子工业股份有限公司 | DC-AC voltage conversion circuit and control method |
| CN1305195C (en) * | 2003-06-09 | 2007-03-14 | 清华大学 | Active power filtering method with inversing capacitor regulation and branch impendance controlled decoupling |
| US7586762B2 (en) * | 2006-12-12 | 2009-09-08 | O2Micro International Limited | Power supply circuit for LCD backlight and method thereof |
| CN101499657B (en) * | 2008-09-22 | 2014-03-12 | 王晓鹏 | Remote wired, wireless wideband network and electrical power system |
| CN102593869B (en) * | 2012-03-15 | 2014-10-29 | 东北大学 | H full-bridge conversion type micro-inverter grid connecting device |
| CN103076552B (en) * | 2012-03-23 | 2015-05-13 | 南京理工大学 | Method for inhibiting bias voltage ripples and line output amplifier channel non-uniformity |
| CN103001579B (en) * | 2012-11-16 | 2015-04-22 | 上海交通大学 | Direct-current active filter based on bidirectional DC-DC (direct current to direct current) converter |
| JP5975864B2 (en) * | 2012-12-18 | 2016-08-23 | 株式会社日立製作所 | Power converter |
| CN106483348A (en) * | 2016-12-19 | 2017-03-08 | 珠海格力电器股份有限公司 | Ripple detection circuit |
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