Dynamic reactive power support operation method of hybrid commutation converter, converter and equipment

Abstract

The invention discloses a dynamic reactive power support operation method of a hybrid commutation converter, the converter and equipment. The method comprises the following steps: detecting whether the hybrid commutation converter has a reactive power demand or not; starting an advanced turn-off mode under the condition that the hybrid commutation converter has a reactive power demand; determining an initial trigger angle according to a preset target reference value and the output value of the hybrid commutation converter; adjusting the initial trigger angle in a preset second quadrant angle range to obtain a target trigger angle; the next trigger bridge arm is triggered and conducted based on the target trigger angle, so that the hybrid commutation converter outputs reactive power, and the range of the second quadrant angle is 180-270 degrees; according to the embodiment of the invention, the hybrid commutation converter can be supported to realize advanced turn-off in the second quadrant angle range, and the target trigger angle of the next trigger bridge arm is dynamically adjusted by adjusting the initial trigger angle, so that the dynamic reactive power support technology of the hybrid commutation converter is realized.

Description

Technical Field

[0001] This application belongs to the technical field of hybrid commutator converters, and particularly relates to a dynamic reactive power support operation method, converter and equipment for hybrid commutator converters. Background Technology

[0002] With the expansion of DC feed-in scale, the dynamic reactive power support of the receiving-end power grid is insufficient, while the reactive power demand under system disturbance transients increases significantly.

[0003] The reactive power demand of the power grid is usually met by deploying a certain number of filters. However, the switching characteristics of filters mean that they cannot provide flexible dynamic reactive power support during the transient process of AC / DC disturbances in the power grid.

[0004] Hybrid commutated converters (HCCs) use reverse-blocking integrated gate commutated thyristors (RB-IGCTs) instead of traditional thyristors, eliminating the need for a reverse recovery process and achieving a minimum turn-off angle close to 0°, which can reduce the converter's reactive power demand to some extent. However, natural commutation is constrained by the commutation process, and the reduction in reactive power demand in HCCs is limited, still requiring the absorption of a significant amount of reactive power. Summary of the Invention

[0005] This application provides a method, converter, and device for dynamic reactive power support operation of a hybrid commutated converter, which can support the hybrid commutated converter to achieve advanced shutdown within the second quadrant angle range. At the same time, the use of water-cooled MOV can further improve the heat dissipation effect and further stabilize the shutdown control in the advanced shutdown mode, achieving four-quadrant power operation and realizing the dynamic reactive power support technology of the hybrid commutated converter.

[0006] In a first aspect, embodiments of this application provide a method for dynamic reactive power support operation of a hybrid commutator, the method comprising: detecting whether the hybrid commutator has reactive power demand; in the case that the hybrid commutator has reactive power demand, activating a proactive shutdown mode; in the proactive shutdown mode, determining an initial trigger angle based on a preset target reference value and the output value of the hybrid commutator; adjusting the initial trigger angle within a preset second quadrant angle range to obtain a target trigger angle; and triggering the next trigger arm based on the target trigger angle to enable the hybrid commutator to output reactive power, wherein the range of the second quadrant angle is 180° to 270°.

[0007] In a possible implementation, the determining the initial trigger angle according to the preset target reference value and the output value of the hybrid commutation converter includes: obtaining an initial power output value of the hybrid commutation converter; performing detection delay processing on the initial power output value to obtain an actual reactive power output value of the hybrid commutation converter in the leading turn-off mode; performing subtraction operation on the target reference value and the actual reactive power output value to obtain a reactive power difference value; and performing proportional integral control processing on the reactive power difference value to obtain the initial trigger angle.

[0008] In a possible implementation, the adjusting the initial trigger angle in the preset second quadrant angle range to obtain the target trigger angle includes: determining a range of the initial trigger angle; in a case where it is determined that the initial trigger angle is in the second quadrant angle range, taking the initial trigger angle as the target trigger angle of the next trigger bridge arm; or in a case where it is determined that the initial trigger angle is in a third quadrant angle range, adjusting the initial trigger angle to be in the second quadrant angle range by increasing the initial trigger angle, the third quadrant angle range being 90°-180°; and taking the initial trigger angle in the adjusted second quadrant angle range as the target trigger angle of the next trigger bridge arm.

[0009] In a possible implementation, after the detection of whether the hybrid commutation converter has a reactive power demand is performed, the method further includes: in a case where the hybrid commutation converter does not have a reactive power demand, and in a case where the hybrid commutation converter normally commutates, starting a natural turn-off mode, the hybrid commutation converter in the natural turn-off mode corresponding to a natural turn-off trigger angle, the natural turn-off trigger angle ranging from 0° to 180°.

[0010] In a possible implementation, the starting the natural turn-off mode includes: obtaining an end voltage of a currently running bridge arm in the hybrid commutation converter, the end voltage being an output voltage of a power grid in which the hybrid commutation converter is located; and in a case where the end voltage is zero, controlling the currently running bridge arm corresponding to the natural turn-off trigger angle to perform turn-off.

[0011] In a possible implementation, after the detection of whether the hybrid commutation converter has a reactive power demand is performed, the method further includes: in a case where the hybrid commutation converter does not have a reactive power demand, and in a case where the hybrid commutation converter abnormally commutates, starting an active turn-off mode, the hybrid commutation converter in the active turn-off mode corresponding to an active turn-off trigger angle, the active turn-off trigger angle ranging from 0° to 180°.

[0012] In a possible implementation, the starting the active turn-off mode comprises: setting a first turn-off threshold angle, the first turn-off threshold angle ranging from 0 to 180 degrees; and in a case where the active turn-off trigger angle reaches the first turn-off threshold angle, controlling a current running bridge arm in the hybrid commutation converter to perform active turn-off.

[0013] In a second aspect, the embodiments of the present application provide a hybrid commutation converter, comprising a transformer and a bridge arm, the transformer being connected in series with the bridge arm, the bridge arm comprising a first water-cooled arrester and a plurality of switch modules, the plurality of switch modules being connected in series and then connected in parallel with the first water-cooled arrester; the switch module comprising a damping unit, an integrated gate-commutated thyristor, and a second water-cooled arrester; the damping unit, the integrated gate-commutated thyristor, and the second water-cooled arrester being connected in parallel.

[0014] In a possible implementation, the bridge arm further comprises a saturable reactor, one end of the saturable reactor being connected with one end of the integrated gate-commutated thyristor, one end of the damping unit, and one end of the second water-cooled arrester, and the other end of the saturable reactor being connected with one end of the first water-cooled arrester.

[0015] In a third aspect, the embodiments of the present application provide a hybrid commutation converter dynamic reactive power support operation device, comprising a processor and a memory storing computer program instructions; the processor executes the computer program instructions to realize the hybrid commutation converter dynamic reactive power support operation method according to any one of the first aspect.

[0016] The application provides a hybrid commutation converter dynamic reactive power support operation method, a converter and equipment. The application provides a hybrid commutation converter dynamic reactive power support operation method, a converter and equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments of the application will be briefly introduced as follows, and other drawings can be obtained by those of ordinary skill in the art without any creative effort on the premise of not paying any creative effort.

[0018] Figure 1 is a structure diagram of a hybrid commutation converter provided in the prior art;

[0019] Figure 2 is a quadrant distribution diagram of a trigger angle of a hybrid commutation converter provided in Embodiment One of the application;

[0020] Figure 3 is a structure diagram of a hybrid commutation converter provided in Embodiment One of the application;

[0021] Figure 4 is a flowchart of a hybrid commutation converter dynamic reactive power support operation method provided in Embodiment Two of the application;

[0022] Figure 5 is a flowchart of a process for determining an initial trigger angle provided by Embodiment Three of the present application;

[0023] Figure 6 is a flowchart of a process for determining a target trigger angle provided by Embodiment Three of the present application;

[0024] Figure 7 is a flowchart of a process for determining a natural turn-off mode of a hybrid commutation inverter provided by Embodiment Three of the present application;

[0025] Figure 8 is a flowchart of a process for determining an active turn-off mode of a hybrid commutation inverter provided by Embodiment Three of the present application;

[0026] Figure 9 is a control block diagram of a process for determining a dynamic reactive power support operation method of a hybrid commutation inverter provided by Embodiment Three of the present application;

[0027] Figure 10 is a structural diagram of a device for determining a dynamic reactive power support operation of a hybrid commutation inverter provided by Embodiment Four of the present application. DETAILED DESCRIPTION

[0028] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. To make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of the specific details by those skilled in the art. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0029] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0030] Hybrid Commutated Converter (HCC) uses Reverse Blocking Integrated Gate Commutated Thyristor (RB-IGCT) instead of thyristor, without reverse recovery process, minimum off angle γ close to 0°, which can reduce the reactive power demand of the converter to a certain extent. However, natural commutation is subject to commutation process, and the reduction of HCC reactive power demand is limited, and a large amount of reactive power still needs to be absorbed.

[0031] Figure 1 is a structural schematic diagram of a hybrid commutated converter provided in the prior art. As shown in Figure 1 , the hybrid commutated converter 100 includes a transformer 110 and 12 bridge arms (i.e. Figure 1 ID1-ID6 and IY1-IY6 in the figure), the transformer is connected in series with the bridge arms, the upper bridge arm structure is formed by ID1-ID6, the lower bridge arm structure is formed by IY1-IY6, and the current direction of the input bridge arm is changed through the process of alternating switching of alternating current, and the next bridge arm is triggered to run through commutation. According to Figure 1 the structure provided, for example, when the current through the bridge arm IY1 is zero, the natural commutation is performed when the current through the bridge arm IY1 is zero, and the commutation operation is performed by triggering the bridge arm IY3 according to the horizontal commutation mode.

[0032] Embodiment one

[0033] Figure 2 is a quadrant distribution diagram of the triggering angle of a hybrid commutated converter provided in the embodiment one of the present application. According to Figure 2 the diagram provided, under normal circumstances, the hybrid commutated converter relies on the grid voltage to complete the natural commutation. For the rectifier, the valve side alternating current lags behind the alternating voltage in the range of 0°-90° of the first quadrant angle, that is, the hybrid commutated converter absorbs reactive power and also absorbs active power in the rectifier operation stage. For the inverter, the valve side alternating current lags behind the alternating voltage by 90°-180°, which indicates that the converter absorbs reactive power and emits active power during operation.

[0034] The conventional line commutated converter (LCC) ignores the influence of commutation and other factors, and the theoretical maximum trigger angle operating range is (0°, 180°), and the maximum trigger angle operating range of the inverter is (90°, 180°). It can be seen that both are operated in the range of the third quadrant angle and the fourth quadrant angle. It can be seen that the third quadrant angle and the fourth quadrant angle are lagging relative to the first quadrant angle. It is impossible to output reactive power, but in the process of grid operation, the provision of reactive power is still needed, which poses a great challenge to the converter.

[0035] To solve the problems in the prior art, the embodiment of the present application provides a hybrid line commutated converter dynamic reactive power support operation method, a converter and equipment. By setting the trigger angle of the bridge arm in the range of the second quadrant angle, the bridge arm can be controlled to perform advanced commutation. First, the structure of the hybrid line commutated converter provided by the embodiment of the present application is introduced.

[0036] Figure 3 is a structure diagram of a hybrid line commutated converter provided by the first embodiment of the present application. According to the diagram provided by the first embodiment of the present application, the structure of the hybrid line commutated converter specifically includes a transformer 110 and a bridge arm IY1. Figure 3 The transformer 110 and the bridge arm are connected in series.

[0037] The bridge arm IY1 includes a first water-cooled arrester MOV1 and a plurality of switch modules 120. The plurality of switch modules 120 are connected in series and are connected in parallel with the first water-cooled arrester MOV1.

[0038] The switch module 120 includes a damping unit 130, an integrated gate commutated thyristor IGCT, and a second water-cooled arrester MOV2.

[0039] The damping unit 130, the integrated gate commutated thyristor IGCT, and the second water-cooled arrester MOV2 are connected in parallel.

[0040] According to the diagram provided by the first embodiment of the present application, the bridge arm further includes a saturated reactor. Figure 3 One end of the saturated reactor is connected to one end of the integrated gate commutated thyristor IGCT, one end of the damping unit 130, and one end of the second water-cooled arrester MOV2. The other end of the saturated reactor is connected to one end of the first water-cooled arrester MOV1.

[0041] According to the diagram provided by the first embodiment of the present application, the bridge arm further includes a saturated reactor.

[0042] Figure 3 ​The provided diagram is different from the line commutated converter (LCC) in that the power electronic device is replaced by RB-IGCT, and the water-cooled surge arrester (MOV) is connected in parallel with the damping unit to achieve voltage equalization.

[0043] Compared with the conventional hybrid line commutated converter (HCC), the hybrid line commutated converter provided in the application replaces the surge arrester (MOV) with a water-cooled surge arrester (MOV).

[0044] According to Figure 1 and Figure 3 The structure of the hybrid line commutated converter provided in the application is that when the firing angle is in the range of the third quadrant angle and the fourth quadrant angle, the bridge arm is naturally commutated by the firing angle. When reactive power support is needed, the firing angle α needs to be set in the range of the second quadrant angle, i.e., 180°-270°, the bridge arm is directly turned off by the firing angle control, and the firing advance turn-off is realized. Since the firing angle is set in the range of the second quadrant angle, the inverter can promote the reactive power, and the hybrid line commutated converter is provided with reactive power support. Since the circuit is still running during the advance turn-off process, the water-cooled surge arrester (MOV) needs to dissipate heat for the RB-IGCT and the surrounding environment under the premise of voltage equalization. At this time, the water-cooled surge arrester is used to replace the conventional surge arrester (MOV) to achieve better heat dissipation effect. Further, the stability of the hybrid line commutated converter under the advance turn-off operation is assisted.

[0045] Due to the long-term turn-off junction temperature limitation of the device and the heat dissipation capacity limitation of the water-cooled surge arrester (MOV), the advance turn-off operation time is limited. The advance turn-off operation time of the bridge arm is only related to the current level, and the advance turn-off operation time of the water-cooled surge arrester (MOV) is related to the current level, the commutation inductance size, and the heat dissipation power. Generally, the application can be operated for a long time under small current.

[0046] According to the hybrid line commutated converter provided in the application, the water-cooled surge arrester is connected in parallel, and when the hybrid line commutated converter is set to have the firing angle in the range of the second quadrant angle, the advance turn-off of the bridge arm is triggered. For the inverter, active power and reactive power can be output at the same time, the dynamic reactive power support operation technology of the direct current converter is realized, and the heat dissipation capacity is increased through the water-cooled surge arrester, thereby improving the stability and safety of the operation of the hybrid line commutated converter.

[0047] Embodiment Two

[0048] Figure 4 is a flowchart of a hybrid line commutated converter dynamic reactive power support operation method provided in Embodiment Two of the application. According to Figure 4 The provided diagram shows that the steps of the hybrid line commutated converter dynamic reactive power support operation method specifically include the following S401-S405:

[0049] S401, detecting whether there is a reactive power demand of the hybrid line commutated converter.

[0050] The reactive power demand can be understood as whether the power grid where the hybrid phase commutated converter is located needs reactive power support.

[0051] In a possible example scenario, the demand for reactive power in the power grid where the hybrid phase commutated converter is located is detected. When it is detected that the hybrid phase commutated converter needs to output reactive power to the power grid, at this time in the inverter environment, when the next trigger bridge arm commutation is performed according to the trigger angle, the inverter outputs active power and reactive power at the same time. When the hybrid phase commutated converter does not need reactive power demand, it can be kept unchanged according to the conventional operation.

[0052] S402, in the case where the hybrid phase commutated converter has a demand for reactive power, starting the leading turn-off mode.

[0053] The leading turn-off mode can be understood as setting different commutation modes according to different trigger angles of the bridge arm commutation in the hybrid phase commutated converter. In this application, the working mode of the hybrid phase commutated converter is set to the leading turn-off mode, the natural turn-off mode and the active turn-off mode.

[0054] In a possible example scenario, different working modes are set according to different demands of the hybrid phase commutated converter for reactive power. When the hybrid phase commutated converter needs to output reactive power, the working mode is selected by software manipulation, and the logic control is provided to the leading turn-off mode, which provides a reference for the next leading turn-off of the bridge arm.

[0055] S403, in the leading turn-off mode, determining an initial trigger angle according to a target reference value and an output value of the hybrid phase commutated converter.

[0056] The target reference value can be understood as a power regulation reference value corresponding to the trigger angle of the bridge arm commutation. For example, in the rectifier, the trigger angle is set to 0-90°, and the reference range of the output power of the hybrid phase commutated converter in the 0-90° environment can be used as the target reference value. The output value of the hybrid phase commutated converter can be understood as the power value output by the bridge arm of the hybrid phase commutated converter at this time, which represents the output reactive power value. The initial trigger angle can be understood as the trigger angle of the current running bridge arm for turn-off.

[0057] Further, in the leading turn-off mode, the angle range corresponding to the target reference value of the bridge arm of the hybrid phase commutated converter is set to the range of the second quadrant angle, that is, set to 180°-270°. The reactive power value output by the hybrid phase commutated converter in the power grid is obtained, and the obtained result is compared with the target reference value, which is used as the initial trigger angle, to obtain the trigger angle of the bridge arm of the hybrid phase commutated converter for commutation and turn-off.

[0058] S404, adjusting the initial trigger angle in the preset second quadrant angle range to obtain a target trigger angle.

[0059] The target trigger angle mentioned here can be understood as the trigger angle for performing the turn-off process in the hybrid phase commutated converter.

[0060] In a possible example scenario, after obtaining the initial trigger angle, it is necessary to ensure that the initial trigger angle is within the range of the second quadrant angle, so as to ensure that the inverter can output active power and output reactive power at the same time. When the initial trigger angle is not within the range of the second quadrant angle, the initial trigger angle needs to be adjusted within the range of the second quadrant angle, and a new initial trigger angle is repeatedly obtained until the initial trigger angle is within the range of the second quadrant angle, which is used as the target trigger angle to provide the trigger angle for the next trigger bridge arm to perform the phase advance turn-off commutation.

[0061] S405, triggering the next trigger bridge arm to conduct based on the target trigger angle, so that the hybrid phase commutated converter outputs reactive power, and the range of the second quadrant angle is 180°-270°.

[0062] Further, when the target trigger angle is within the range of the second quadrant angle, the target trigger angle is used to control the next trigger bridge arm to perform the phase advance turn-off during commutation. It is ensured that the inverter can output active power and output reactive power at the same time, thereby realizing the reactive power support operation technology of the hybrid phase commutated converter. Through the process of adjusting the initial trigger angle, dynamic adjustment is realized, and the stability of the dynamic reactive power support of the hybrid phase commutated converter is improved.

[0063] The application provides a hybrid phase commutated converter dynamic reactive power support operation method. When it is detected that the hybrid phase commutated converter needs reactive power support, the phase advance turn-off mode is started. The initial trigger angle is adjusted within the range of the second quadrant angle, so that the final trigger angle is within the range of the second quadrant angle. Then, the second quadrant angle is used to trigger the next trigger bridge arm to perform the phase advance turn-off, so as to output the reactive power and realize the dynamic reactive power support operation technology of the hybrid phase commutated converter.

[0064] Embodiment three

[0065] Figure 5 is a flowchart for determining an initial trigger angle provided by the third embodiment of the application. Figure 5 is introduced on the basis of the above embodiment. According to Figure 5 The provided diagram further includes steps S501-S504 for step S403 after steps S401-S402:

[0066] S501, obtaining an initial power output value of the hybrid phase commutated converter.

[0067] The initial power output value can be understood as the power output value of the currently running bridge arm in the hybrid phase commutated converter.

[0068] In a possible example scenario, the output power of the running bridge arm in the hybrid phase commutated converter is first taken as the initial power output value, to provide reference data for the next step of calculating the commutation trigger angle corresponding to the running bridge arm.

[0069] S502, the initial power output value is detected and delayed to obtain the actual reactive power output value of the hybrid phase commutated converter in the leading turn-off mode.

[0070] The detection and delay process can be understood as a delay process of the output power of the currently running bridge arm.

[0071] Further, the output power value of the currently running bridge arm is delayed to filter out the influence of time delay on the power output, and thus the actual reactive power output value of the running bridge arm in the leading turn-off mode is obtained, to provide reference data for the next step of determining the initial trigger angle.

[0072] S503, the target reference value is subtracted from the actual reactive power output value to obtain a reactive power difference value.

[0073] Further, the actual reactive power output value of the running bridge arm is taken as negative, and is added to the target reference value representing the second quadrant, to obtain the difference value, which is taken as the reactive power difference value. The reactive power difference value can be greater than 0 or less than 0. Different values provide different adjustment directions for the trigger angle.

[0074] S504, the reactive power difference value is subjected to proportional-integral control processing to obtain the initial trigger angle.

[0075] The proportional-integral control can be understood as the processing process of a PI processor.

[0076] The running bridge arm reactive power difference value obtained by operation is subjected to PI processor processing to obtain the commutation trigger angle of the running bridge arm, which is taken as the initial trigger angle.

[0077] Figure 6 is another flowchart for determining the target trigger angle provided by Embodiment Three of the present application. Figure 6 is introduced on the basis of Figure 4 . According to the diagram provided by Figure 6 , after steps S401-S403, steps S601-S604 are further included for step S404:

[0078] S601. Determine the range of the initial trigger angle.

[0079] According to Figure 2 According to the diagram provided, the range of the trigger angle includes four quadrant angles. Under the rectifier, the trigger angle is the first quadrant angle and the fourth quadrant angle, active power is absorbed through the rectifier, while reactive power is also absorbed. Under the inverter, the trigger angle is the second quadrant angle and the third quadrant angle, within the third quadrant angle, active power is output through the inverter, while no reactive power is generated. Within the second quadrant angle, active power is output through the inverter, while reactive power is also output.

[0080] S602. In the case where it is determined that the initial trigger angle is within the range of the second quadrant angle, the initial trigger angle is taken as the target trigger angle of the next trigger bridge arm.

[0081] In a possible example scenario, when it is determined that the initial trigger angle is within the range of the second quadrant angle, it can be determined that the current is in the leading turn-off mode, and the range of the trigger angle of the running bridge arm is 180°-270°, so that the initial trigger angle is taken as the target trigger angle without the need for adjustment of the target trigger angle, and the initial trigger angle is used as the target trigger angle for the next trigger bridge arm.

[0082] S603. In the case where it is determined that the initial trigger angle is within the range of the third quadrant angle, the initial trigger angle is adjusted to be within the range of the second quadrant angle by increasing the initial trigger angle, and the range of the third quadrant angle is 90°-180°.

[0083] S604. The initial trigger angle within the adjusted range of the second quadrant angle is taken as the target trigger angle of the next trigger bridge arm.

[0084] In a possible example scenario, when it is determined that the initial trigger angle is within the range of the third quadrant angle, it can be determined that the current running bridge arm corresponds to the inverter environment, which can only output active power but cannot output reactive power, so the initial trigger angle needs to be adjusted. The initial trigger angle within the range of 90°-180° is adjusted to be within the range of 180°-270° by increasing the initial trigger angle, and within the range of 180°-270°, it is possible to output active power and reactive power through the inverter. The adjusted initial trigger angle is taken as the target trigger angle to provide a commutation trigger angle for the next trigger bridge arm.

[0085] Figure 7 is a flowchart of a natural turn-off mode of a hybrid commutation converter provided by an embodiment of the present application. According to Figure 7 According to the diagram provided, the specific steps of the natural turn-off mode of the hybrid commutation converter include S701-S703:

[0086] S701, in the absence of reactive power demand of the hybrid commutation converter, and in the case of normal commutation of the hybrid commutation converter, the natural turn-off mode is started, and the trigger angle corresponding to the hybrid commutation converter in the natural turn-off mode is a natural turn-off trigger angle, and the range of the natural turn-off trigger angle is 0-180°.

[0087] In a possible example scenario, the hybrid commutation converter is in different working modes according to the size of the trigger angle of the bridge arm. The working mode of the hybrid commutation converter is set to the advance turn-off mode and the non-advance turn-off mode. The natural turn-off mode is also included in the non-advance turn-off mode. The hybrid commutation converter in the natural turn-off mode complies with the conventional operation of the hybrid commutation converter. That is, in the rectifier environment, the reactive power and the active power are absorbed. In the inverter environment, the active power is output, and no reactive power is generated.

[0088] S702, the terminal voltage of the current running bridge arm in the hybrid commutation converter is obtained, and the terminal voltage is the output voltage of the power grid where the hybrid commutation converter is located.

[0089] S703, when the terminal voltage is zero, the current running bridge arm corresponding to the natural turn-off trigger angle is controlled to perform turn-off.

[0090] Further, according to the terminal voltage of the current running bridge arm, the output voltage of the hybrid commutation converter can be known, and when the output voltage is zero, the current running bridge arm will naturally turn off the commutation. This turn-off commutation mode is used as the natural turn-off mode. The natural turn-off mode can be used when the hybrid commutation converter is running normally, but when the hybrid commutation converter fails to commutate or abnormally runs, the natural turn-off mode cannot be used.

[0091] Figure 8 is a flowchart of a hybrid commutation converter active turn-off mode provided by the present application. According to the hybrid commutation converter active turn-off mode, the trigger angle corresponding to the hybrid commutation converter in the active turn-off mode is an active turn-off trigger angle, and the range of the active turn-off trigger angle is 0-180°. Figure 8 According to the provided diagram, the specific steps of the hybrid commutation converter active turn-off mode include S801-S803:

[0092] S801, in the absence of reactive power demand of the hybrid commutation converter, and in the case of abnormal commutation of the hybrid commutation converter, the active turn-off mode is started, and the trigger angle corresponding to the hybrid commutation converter in the active turn-off mode is an active turn-off trigger angle, and the range of the active turn-off trigger angle is 0-180°.

[0093] When the bridge arm of the hybrid commutation converter runs abnormally or fails to commutate, the natural turn-off mode cannot be used, and the software control instruction needs to be switched to the active turn-off mode. Different from the advance turn-off mode, because the range of the trigger angle is different, the trigger angle cannot be in the range of the second quadrant angle, and no reactive power will be output in the active turn-off mode. That is, the hybrid commutation converter in the active turn-off mode cannot realize dynamic reactive power support operation.

[0094] S802, set a first turn-off threshold angle, the first turn-off threshold angle ranges from 0 to 180 degrees.

[0095] S803, in the case that the active turn-off trigger angle reaches the first turn-off threshold angle, control the current running bridge arm in the hybrid commutation converter to perform active turn-off.

[0096] By setting the first turn-off threshold angle, when the bridge arm of the hybrid commutation converter is detected to be abnormal or commutation fails, or without any requirement, the active turn-off mode is selected by the software control instruction. By detecting the size of the target trigger angle, when the target trigger angle is adjusted to the first turn-off threshold angle, the hybrid commutation converter is controlled to turn off the running bridge arm, and protection control is realized. In the active turn-off mode, since the first turn-off threshold angle is in the first quadrant, the third quadrant or the fourth quadrant, the hybrid commutation converter cannot output reactive power, that is, the hybrid commutation converter does not support reactive power output in the active turn-off mode.

[0097] In a possible example scenario, Figure 9 is a control block diagram of a hybrid commutation converter dynamic reactive power support operation method provided by an embodiment of the application. According to Figure 9 According to the provided diagram, the working mode of the current running bridge arm is determined by selecting 0 representing the non-lead turn-off mode or 1 representing the lead turn-off mode through the control instruction ctrl. Wherein Qac represents the reactive output power, and the actual reactive power value is output after the delay processing of Qac, and compared with the target reference value Qacref. The comparison result is processed by PI to obtain the trigger angle a in the lead turn-off mode. The trigger angle a is used to control the bridge arm to perform lead turn-off commutation and output reactive power. When the control instruction ctrl selects 0, the minimum turn-off angle g min is compared with the turn-off reference value g ref The comparison result is processed by maximum operation and PI, and the maximum value is selected from the result after the delay processing of the actual output power Udc and the comparison and PI processing of the reference value Udcref. The calculated angle value is removed by PI, that is, the trigger angle is compensated to obtain the trigger angle a in the non-lead turn-off mode. The trigger angle a is used to control the bridge arm to perform natural turn-off or active turn-off.

[0098] Normally, the hybrid commutation converter HCC works in commutation enhancement mode, the mode selection instruction ctrl is 0. At this time, the turn-off angle is close to zero, and the active power is sent while reducing the reactive power consumption. When the hybrid commutation converter HCC needs to provide short-time reactive power support, the hybrid commutation converter HCC works in the over-extended turn-off mode, and the mode selection instruction ctrl is 1. The control system compares the hybrid commutation converter output reactive power with the reference value, and when the output reactive power needs to be increased (decreased), the trigger angle of the next trigger bridge arm is increased (decreased), and the upper bridge arm is actively turned off after the next bridge arm is triggered, to achieve the purpose of dynamically tracking the reactive power reference value.

[0099] Embodiment four

[0100] Figure 10 Figure 1 is a structural schematic diagram of a hybrid commutation converter dynamic reactive power support running equipment provided by an embodiment of the present application. According to the hybrid commutation converter dynamic reactive power support running equipment, the hybrid commutation converter HCC can work in the commutation enhancement mode or the over-extended turn-off mode. Figure 10 The provided diagram shows that the hybrid commutation converter dynamic reactive power support running equipment can include a processor 1001 and a memory 1002 storing computer program instructions.

[0101] Specifically, the processor 1001 can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present application.

[0102] The memory 1002 can include a mass storage for data or instructions. By way of example and not limitation, the memory 1002 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory 1002 can include removable or non-removable (or fixed) media. Where appropriate, the memory 1002 can be internal or external to the integrated gateway disaster recovery device. In certain embodiments, the memory 1002 is non-volatile solid-state memory.

[0103] The memory can include read-only memory (ROM), random access memory (RAM), magnetic disk storage mediums, optical storage mediums, flash memory devices, electrical, optical, or other physical / tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software that, when executed (e.g., by one or more processors), is operable to perform operations described with reference to the methods according to the first aspect of the present application.

[0104] The processor 1001 implements the hybrid crowbar dynamic reactive power support operation method in any of the above embodiments by reading and executing computer program instructions stored in the memory 1002.

[0105] In one example, the hybrid crowbar dynamic reactive power support operation device can further include a communication interface 1003 and a bus 1010. Wherein, as shown in the figure, the processor 1001, the memory 1002, the communication interface 1003 are connected through the bus 1010 and complete the communication between each other. Figure 10

[0106] The communication interface 1003 is mainly used to realize the communication between each module, device, unit and / or equipment in the embodiments of the present application.

[0107] The bus 1010 includes hardware, software or both to couple components of the online data traffic billing device to each other. By way of example, and not limitation, the bus can include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand (IB) interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association local (VLB) bus, or another suitable bus or a combination of two or more of these. Where suitable, the bus 1010 can include one or more buses. Although specific buses are described and illustrated in the embodiments of the present application, the present application contemplates any suitable bus or interconnect.

[0108] The hybrid crowbar dynamic reactive power support operation device can perform the online data traffic billing method in the embodiments of the present application based on the currently intercepted spam messages and the user reported messages, so as to realize the hybrid crowbar dynamic reactive power support operation method described in combination Figures 2-9 with the above embodiments.

[0109] In addition, in combination with the hybrid crowbar dynamic reactive power support operation method in the above embodiments, the embodiments of the present application can provide a computer storage medium to realize. The computer storage medium has computer program instructions stored thereon; the computer program instructions are executed by the processor to realize any of the hybrid crowbar dynamic reactive power support operation methods in the above embodiments.

[0110] ​It is to be understood that the application is not limited to particular configurations and processes described herein and shown in the drawings. The detailed description is not to be taken as limiting the application. In the above embodiments, several specific steps are described and illustrated in order to provide a thorough understanding of the application. However, the application can be practiced with fewer or additional steps, and in a different order. The application is not limited to the described and illustrated embodiments.

[0111] The functions noted in the description of the above-described structural diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, functional cards, and the like. When implemented in software, the elements of the application are program or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. A "machine-readable medium" includes any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network, such as the Internet, an intranet, and the like.

[0112] It is also to be understood that the example embodiments described herein are based on a series of steps or apparatuses to describe some methods or systems. However, the application is not limited to the order of the steps described above, that is, the steps can be performed in the order mentioned in the embodiments, or in an order different from the embodiments, or several steps can be performed simultaneously.

[0113] The above-described aspects of the application are described above with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / acts specified in the flowcharts and / or block diagrams. Such a processor can be, but is not limited to, a general purpose processor, a special purpose processor, a special purpose application specific processor, or a field programmable logic array. It should also be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by dedicated hardware-based systems that perform the specified functions or acts, or combinations of hardware and software.

[0114] The above merely describes a specific implementation of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description, and the corresponding processes in the foregoing method embodiments can be referred to, which will not be described herein again. It should be understood that the protection scope of the present application is not limited in this way, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered in the protection scope of the present application.

Claims

1. A method for dynamic reactive power support operation of a hybrid commutation converter, characterized in that, The method comprises the following steps: detecting whether there is a reactive power demand for the hybrid commutation converter; starting an advance turn-off mode when there is a reactive power demand for the hybrid commutation converter; determining an initial trigger angle according to a preset target reference value and an output value of the hybrid commutation converter in the advance turn-off mode; adjusting the initial trigger angle in a preset second quadrant angle range to obtain a target trigger angle; triggering a next trigger bridge arm to be turned on based on the target trigger angle, so that the hybrid commutation converter outputs reactive power, and the second quadrant angle range is 180°-270°.

2. The method of claim 1, wherein the dynamic reactive support operation of the hybrid commutation converter is performed in a manner that, The step of determining the initial trigger angle according to the preset target reference value and the output value of the hybrid commutation converter comprises the following steps: obtaining an initial power output value of the hybrid commutation converter; detecting and delaying the initial power output value to obtain an actual reactive power output value of the hybrid commutation converter in the advance turn-off mode; performing a subtraction operation on the target reference value and the actual reactive power output value to obtain a reactive power difference value; performing proportional-integral control on the reactive power difference value to obtain the initial trigger angle.

3. The method of claim 1, wherein the dynamic reactive support operation of the hybrid commutation converter is performed by: The step of adjusting the initial trigger angle in the preset second quadrant angle range to obtain the target trigger angle comprises the following steps: determining a range of the initial trigger angle; when it is determined that the initial trigger angle is in the second quadrant angle range, taking the initial trigger angle as the target trigger angle of the next trigger bridge arm; or, when it is determined that the initial trigger angle is in a third quadrant angle range, adjusting the initial trigger angle to be in the second quadrant angle range by increasing the initial trigger angle, and the third quadrant angle range is 90°-180°; taking the initial trigger angle in the adjusted second quadrant angle range as the target trigger angle of the next trigger bridge arm.

4. The method of claim 1, wherein the dynamic reactive support operation of the hybrid commutation converter is performed by: After the step of detecting whether there is a reactive power demand for the hybrid commutation converter, the method further comprises the following steps: starting a natural turn-off mode when there is no reactive power demand for the hybrid commutation converter and when the hybrid commutation converter normally commutates, and a trigger angle corresponding to the hybrid commutation converter in the natural turn-off mode is a natural turn-off trigger angle, and the natural turn-off trigger angle range is 0-180°.

5. The method of claim 4, wherein, The step of starting the natural turn-off mode comprises the following steps: obtaining an end voltage of a currently running bridge arm in the hybrid commutation converter, and the end voltage is an output voltage of a power grid where the hybrid commutation converter is located; when the end voltage is zero, controlling the currently running bridge arm corresponding to the natural turn-off trigger angle to be turned off.

6. The method of claim 1, wherein the dynamic reactive support operation of the hybrid commutation converter is performed by: After the step of detecting whether there is a reactive power demand for the hybrid commutation converter, the method further comprises the following steps: starting an active turn-off mode when there is no reactive power demand for the hybrid commutation converter and when the hybrid commutation converter abnormally commutates, and a trigger angle corresponding to the hybrid commutation converter in the active turn-off mode is an active turn-off trigger angle, and the active turn-off trigger angle range is 0-180°.

7. The method of claim 6, wherein the dynamic var support operation of the hybrid commutation converter is performed in a manner that is further characterized by: The step of starting the active turn-off mode comprises the following steps: A first turn-off threshold angle is set, and the first turn-off threshold angle ranges from 0 to 180 degrees; In the case that the active turn-off trigger angle reaches the first turn-off threshold angle, the current operating bridge arm in the hybrid commutation converter is controlled to perform active turn-off. 8.A hybrid commutation converter, comprising a transformer and a bridge arm, the transformer being connected in series with the bridge arm, characterized in that, the bridge arm comprises a first water-cooled arrester and a plurality of switch modules, and the plurality of switch modules are connected in series and then connected in parallel with the first water-cooled arrester; the switch module comprises a damping unit, an integrated gate commutated thyristor, and a second water-cooled arrester; the damping unit, the integrated gate commutated thyristor, and the second water-cooled arrester are connected in parallel.

9. The hybrid commutation inverter of claim 8, wherein, the bridge arm further comprises a saturated reactor; one end of the saturated reactor is connected with one end of the integrated gate commutated thyristor, one end of the damping unit, and one end of the second water-cooled arrester, and the other end of the saturated reactor is connected with one end of the first water-cooled arrester.

10. A hybrid commutation inverter dynamic reactive support operating device, characterized by, The device comprises a processor and a memory storing computer program instructions; the processor executes the computer program instructions to realize the hybrid commutation converter dynamic reactive power support operation method according to any one of claims 1-7.

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