CN105449726B - The current-sharing control method of Bidirectional variable-flow type feedback device and traction rectifier device - Google Patents
The current-sharing control method of Bidirectional variable-flow type feedback device and traction rectifier device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between AC networks and DC networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
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Abstract
本发明涉及双向变流型回馈装置与牵引整流器的均流控制方法，该方法包括如下步骤：1)获取牵引整流器的空载电压值及等效内阻，从而得到牵引整流器的电压与电流的关系；2)根据牵引整流器的空载电压值，为双向变流型回馈装置设置空载电压值；3)根据牵引整流器的等效内阻，设置双向变流型回馈装置的下垂系数，使双向变流型回馈装置的等效内阻始终等于牵引整流器的等效内阻；4)双向变流型回馈装置按照设置的空载电压值及下垂系数为地铁机车牵引供电。该方法无需硬件改动，无需增加额外成本，只通过软件的控制算法达到双向变流型回馈装置与牵引整流器的均流控制，提高双向变流型回馈装置和牵引整流器的寿命。
The invention relates to a current sharing control method of a bidirectional converter feedback device and a traction rectifier. The method comprises the following steps: 1) obtaining the no-load voltage value and equivalent internal resistance of the traction rectifier, thereby obtaining the relationship between the voltage and the current of the traction rectifier ; 2) According to the no-load voltage value of the traction rectifier, set the no-load voltage value for the two-way converter type feedback device; 3) According to the equivalent internal resistance of the traction rectifier, set the droop coefficient of the two-way converter type feedback device, so that the two-way converter The equivalent internal resistance of the flow feedback device is always equal to the equivalent internal resistance of the traction rectifier; 4) The two-way variable flow feedback device supplies power for the subway locomotive traction according to the set no-load voltage value and droop coefficient. The method does not require hardware modification and additional cost, and only achieves the current sharing control of the bidirectional variable current feedback device and the traction rectifier through the control algorithm of the software, thereby improving the service life of the bidirectional variable current feedback device and the traction rectifier.
Description
技术领域technical field
本发明属于地铁再生制动能量回馈领域，具体涉及双向变流型回馈装置与牵引整流器的均流控制方法。The invention belongs to the field of subway regenerative braking energy feedback, and in particular relates to a bidirectional variable flow feedback device and a current equalization control method for a traction rectifier.
背景技术Background technique
随着国家经济的飞速发展，越来越多的提倡低碳环保、绿色能源。城市轨道交通迅猛发展，地铁再生制动回馈变流器以逆变回馈并网的方式将地铁机车刹车制动时产生的多余能量回馈至交流电网，发挥地铁再生制动的优势，具有低碳节能、绿色环保、稳定可靠、投资低的突出优势，是未来地铁再生制动能量吸收的发展方向。With the rapid development of the national economy, more and more people advocate low-carbon environmental protection and green energy. With the rapid development of urban rail transit, the subway regenerative braking feedback converter feeds back the excess energy generated when the subway locomotive brakes and brakes to the AC power grid in the way of inverter feedback and grid connection, giving full play to the advantages of subway regenerative braking, which has low carbon and energy saving The outstanding advantages of green, environmental protection, stability and reliability, and low investment are the development direction of regenerative braking energy absorption for subways in the future.
地铁回馈变流器本身属于三相电压型PWM整流器，PWM整流器具有能量双向传输和功率因数可控的优点，因此地铁回馈变流器不但可以实现当地铁机车制动时将能量逆变至交流电网，也可以当地铁机车牵引时将交流电整流为地铁机车牵引供电。机车牵引时，双向变流型回馈装置与牵引整流器同时给机车供电，由于两者的内阻不同，必然会导致不均流，甚至严重时双向变流型回馈装置与牵引整流器之间产生环流。双向变流型回馈装置及牵引整流器的牵引供电系统示意图如图1所示。The subway regenerative converter itself belongs to the three-phase voltage PWM rectifier. The PWM rectifier has the advantages of bidirectional energy transmission and power factor controllability. Therefore, the subway regenerative converter can not only realize the energy inversion to the AC grid when the subway locomotive is braking. , when the subway locomotive is being pulled, the alternating current can also be rectified to provide power for the subway locomotive traction. When the locomotive is being towed, the two-way variable current feedback device and the traction rectifier supply power to the locomotive at the same time. Due to the difference in internal resistance between the two, it will inevitably lead to uneven current, and even in severe cases, a circulating current will be generated between the two-way variable current feedback device and the traction rectifier. The schematic diagram of the traction power supply system of the bidirectional converter feedback device and the traction rectifier is shown in Fig. 1 .
发明内容Contents of the invention
本发明提供了双向变流型回馈装置与牵引整流器的均流控制方法，以解决双向变流型回馈装置与牵引整流器同时给机车供电时，二者之间产生环流而降低双向变流型回馈装置与牵引整流器使用寿命的问题。The present invention provides a current sharing control method for a bidirectional variable current feedback device and a traction rectifier to solve the problem that when the bidirectional variable current feedback device and the traction rectifier supply power to a locomotive at the same time, a circulating current is generated between the two to reduce the bidirectional variable current feedback device. Problems with traction rectifier service life.
为解决上述技术问题，本发明的双向变流型回馈装置与牵引整流器的均流控制方法包括如下步骤：In order to solve the above technical problems, the current sharing control method of the two-way variable current feedback device and the traction rectifier of the present invention includes the following steps:
1)获取牵引整流器的空载电压值及等效内阻，从而得到牵引整流器的电压与电流的关系；1) Obtain the no-load voltage value and equivalent internal resistance of the traction rectifier, so as to obtain the relationship between the voltage and current of the traction rectifier;
2)根据牵引整流器的空载电压值，为双向变流型回馈装置设置空载电压值；2) According to the no-load voltage value of the traction rectifier, set the no-load voltage value for the bidirectional converter feedback device;
3)根据牵引整流器的等效内阻，设置双向变流型回馈装置的下垂系数，使双向变流型回馈装置的等效内阻始终等于牵引整流器的等效内阻；3) According to the equivalent internal resistance of the traction rectifier, set the droop coefficient of the two-way variable flow feedback device, so that the equivalent internal resistance of the two-way variable flow feedback device is always equal to the equivalent internal resistance of the traction rectifier;
4)双向变流型回馈装置按照设置的空载电压值及下垂系数为地铁机车牵引供电。4) The two-way variable current feedback device provides traction power for subway locomotives according to the set no-load voltage value and droop coefficient.
步骤3)中采用的下垂控制为分段下垂控制，根据牵引整流器在不同阶段的等效内阻，设置双向变流型回馈装置在对应阶段的下垂系数，使双向变流型回馈装置的等效内阻与牵引整流器的等效内阻时时相等。The droop control adopted in step 3) is segmented droop control. According to the equivalent internal resistance of the traction rectifier at different stages, set the droop coefficient of the two-way variable flow feedback device in the corresponding stage, so that the equivalent of the two-way variable flow feedback device The internal resistance is always equal to the equivalent internal resistance of the traction rectifier.
所述双向变流型回馈装置的空载电压值不小于牵引整流器的空载电压值。The no-load voltage value of the bidirectional converter feedback device is not less than the no-load voltage value of the traction rectifier.
结合双向变流型回馈装置和牵引整流器同时为地铁机车牵引供电的实际情况，实时对双向变流型回馈装置的下垂系数进行调整，以提高均流度。Combined with the actual situation that the two-way variable current feedback device and the traction rectifier simultaneously provide traction power for subway locomotives, the droop coefficient of the two-way variable current feedback device is adjusted in real time to improve the flow uniformity.
本发明的双向变流型回馈装置与牵引整流器的均流控制方法根据牵引整流器的空载电压和等效内阻，对双向变流型回馈装置的空载电压和等效内阻的控制，即下垂控制，实现与牵引整流器的均流运行。该方法无需硬件改动，无需增加额外成本，只通过软件的下垂控制算法达到双向变流型回馈装置与牵引整流器的均流控制，提高双向变流型回馈装置和牵引整流器的寿命。According to the no-load voltage and equivalent internal resistance of the traction rectifier, the current sharing control method of the bidirectional conversion type feedback device and the traction rectifier of the present invention controls the no-load voltage and equivalent internal resistance of the bidirectional conversion type feedback device, namely Droop control to achieve current sharing operation with the traction rectifier. This method does not require hardware modification and additional cost, and only achieves the current sharing control of the bidirectional variable current feedback device and the traction rectifier through the droop control algorithm of the software, thereby improving the life of the bidirectional variable current feedback device and the traction rectifier.
附图说明Description of drawings
图1为双向变流型回馈装置及牵引整流器的牵引供电系统示意图；Fig. 1 is a schematic diagram of a traction power supply system of a bidirectional converter type feedback device and a traction rectifier;
图2为双向变流型回馈装置与牵引整流器的均流控制策略图。Fig. 2 is a flow sharing control strategy diagram of the bidirectional converter feedback device and the traction rectifier.
具体实施方式detailed description
下面结合附图，对本发明的技术方案作进一步详细介绍。The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings.
本实施例的双向变流型回馈装置与牵引整流器的均流控制方法包括如下步骤：The current sharing control method of the two-way variable current feedback device and the traction rectifier in this embodiment includes the following steps:
1)获取牵引整流器的空载电压值及等效内阻，从而得到牵引整流器的电压与电流的关系；1) Obtain the no-load voltage value and equivalent internal resistance of the traction rectifier, so as to obtain the relationship between the voltage and current of the traction rectifier;
2)根据牵引整流器的空载电压值，为双向变流型回馈装置设置空载电压值；2) According to the no-load voltage value of the traction rectifier, set the no-load voltage value for the bidirectional converter feedback device;
3)根据牵引整流器的等效内阻，设置双向变流型回馈装置的下垂系数，使双向变流型回馈装置的等效内阻始终等于牵引整流器的等效内阻；3) According to the equivalent internal resistance of the traction rectifier, set the droop coefficient of the two-way variable flow feedback device, so that the equivalent internal resistance of the two-way variable flow feedback device is always equal to the equivalent internal resistance of the traction rectifier;
4)双向变流型回馈装置按照设置的空载电压值及下垂系数为地铁机车牵引供电。4) The two-way variable current feedback device provides traction power for subway locomotives according to the set no-load voltage value and droop coefficient.
步骤3)中采用的下垂控制为分段下垂控制，根据牵引整流器在不同阶段的等效内阻，设置双向变流型回馈装置在对应阶段的下垂系数，使双向变流型回馈装置的等效内阻与牵引整流器的等效内阻时时相等。The droop control adopted in step 3) is segmented droop control. According to the equivalent internal resistance of the traction rectifier at different stages, set the droop coefficient of the two-way variable flow feedback device in the corresponding stage, so that the equivalent of the two-way variable flow feedback device The internal resistance is always equal to the equivalent internal resistance of the traction rectifier.
双向变流型回馈装置的空载电压值不小于牵引整流器的空载电压值。The no-load voltage value of the bidirectional converter feedback device is not less than the no-load voltage value of the traction rectifier.
进一步，可进行牵引测试，双向变流型回馈装置和牵引整流器同时为地铁机车牵引供电，对比均流情况，再进一步微调双向变流型回馈装置的下垂系数，从而使均流度更高。Further, the traction test can be carried out, the two-way variable current feedback device and the traction rectifier supply power for the traction of the subway locomotive at the same time, and the current sharing situation is compared, and then the droop coefficient of the two-way variable current feedback device is further fine-tuned, so that the current sharing degree is higher.
机车牵引时，双向变流型回馈装置与牵引整流器同时给机车供电，由于牵引整流器的空载电压和等效内阻是不可控的，而双向变流型回馈装置的空载电压和等效内阻是可控的，因此通过对双向变流型回馈装置的下垂控制，实现与牵引整流器的均流运行。其中，下垂控制算法为现有技术中常用技术手段，这里不再详细说明。该方法主要在于通过调节下垂系数来控制双向变流型回馈装置的等效内阻，使双向变流型回馈装置的等效内阻始终与牵引整流器的等效内阻相同，从而实现与牵引整流器的均流运行。该方法无需硬件改动，无需增加额外成本，只通过软件的控制算法达到双向变流型回馈装置与牵引整流器的均流控制，提高双向变流型回馈装置和牵引整流器的寿命。When the locomotive is being towed, the two-way conversion feedback device and the traction rectifier supply power to the locomotive at the same time. Since the no-load voltage and equivalent internal resistance of the traction rectifier are uncontrollable, the no-load voltage and equivalent internal resistance of the two-way conversion feedback device The resistance is controllable, so the current sharing operation with the traction rectifier is realized through the droop control of the bidirectional converter feedback device. Among them, the droop control algorithm is a common technical means in the prior art, and will not be described in detail here. The method is mainly to control the equivalent internal resistance of the two-way variable current feedback device by adjusting the droop coefficient, so that the equivalent internal resistance of the two-way variable current type feedback device is always the same as the equivalent internal resistance of the traction rectifier, thereby achieving the same effect as the traction rectifier. current equalization operation. The method does not require hardware modification and additional cost, and only achieves the current sharing control of the bidirectional variable current feedback device and the traction rectifier through the control algorithm of the software, thereby improving the service life of the bidirectional variable current feedback device and the traction rectifier.
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