CN117578904A - Control method, device and medium for sagging characteristic of bidirectional converter - Google Patents
Control method, device and medium for sagging characteristic of bidirectional converter Download PDFInfo
- Publication number
- CN117578904A CN117578904A CN202311527235.1A CN202311527235A CN117578904A CN 117578904 A CN117578904 A CN 117578904A CN 202311527235 A CN202311527235 A CN 202311527235A CN 117578904 A CN117578904 A CN 117578904A
- Authority
- CN
- China
- Prior art keywords
- voltage
- output power
- bidirectional converter
- rectifier unit
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000007665 sagging Methods 0.000 title abstract description 28
- 238000004590 computer program Methods 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000013473 artificial intelligence Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The application relates to the technical field of traction power supply, and discloses a control method, a device and a medium for sagging characteristics of a bidirectional converter, comprising the following steps: obtaining output power of a bidirectional converter and a diode rectifier unit, and a voltage given value and a load voltage actual value; calculating a voltage command value through the output power of the bidirectional converter and the diode rectifier unit; sequentially performing voltage loop control and current loop control on a voltage given value, a load voltage actual value and a voltage command value so as to generate PWM waves; the duty cycle of the PWM wave is adjusted so that the output power of the bi-directional converter is equal to the output power of the diode rectifier unit. Therefore, PWM waves are generated based on double-loop control of the voltage loop and the current loop, the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, and current sharing of parallel operation of the bidirectional converter and the diode rectifier unit is further achieved.
Description
Technical Field
The application relates to the technical field of traction power supply, in particular to a control method, a device and a medium for sagging characteristics of a bidirectional converter.
Background
In urban rail transit, the traction power supply mode based on the combination of a bidirectional converter and a diode rectifier unit is generally adopted for the traction power supply of the train. When the train is braked, the bidirectional converter works in a feedback mode, and regenerative braking energy is quickly fed back to the AC power grid side in an inversion mode. When the train is started, the bidirectional converter works in a rectification mode and realizes traction power supply of the train together with the diode rectifier unit.
At present, the bidirectional converter has the output external characteristic of voltage stabilization, but the output characteristic of the diode rectifier unit naturally sags, so that the output power of the bidirectional converter is unequal to the output power of the diode rectifier unit, and the problem that active loads of the bidirectional converter and the diode rectifier unit are unevenly distributed is further caused, namely, the current sharing problem of parallel operation of the bidirectional converter and the diode rectifier unit is caused.
Therefore, how to realize current sharing of parallel operation of the bidirectional converter and the diode rectifier unit is a problem to be solved by the person skilled in the art.
Disclosure of Invention
The utility model aims to provide a control method, a device and a medium for the sagging characteristic of a bidirectional converter, which are used for realizing the current sharing of the parallel operation of the bidirectional converter and a diode rectifier unit, ensuring the cooperative power supply of the bidirectional converter and the diode rectifier unit and improving the redundancy and the reliability of an urban rail transit power supply system.
In order to solve the above technical problems, the present application provides a control method for a droop characteristic of a bidirectional converter, including:
obtaining the output power of a bidirectional converter, the output power of a diode rectifier unit, a voltage given value and a load voltage actual value;
calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit;
sequentially performing voltage loop control and current loop control on the voltage set value, the load voltage actual value and the voltage command value so as to generate PWM waves;
and adjusting the duty ratio of the PWM wave so that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit.
Preferably, the calculating the voltage command value by the output power of the bidirectional converter and the output power of the diode-rectifier unit includes:
calculating the average power of the output power of the bidirectional converter and the output power of the diode rectifier unit;
and performing PI control on the difference value between the average power and the output power of the bidirectional converter to obtain the voltage command value.
Preferably, the current loop control includes active current loop control and reactive current loop control.
Preferably, said sequentially performing voltage loop control and current loop control on said voltage set point, said actual load voltage value and said voltage command value to generate PWM waves includes:
performing voltage loop control on the voltage set value, the load voltage actual value and the voltage command value to obtain an active current loop set value;
acquiring a reactive current loop given value;
obtaining active voltage according to the active current loop set value, and obtaining reactive voltage according to the reactive current loop set value;
the PWM wave is generated by the active voltage and the reactive voltage.
Preferably, obtaining the active voltage according to the active current loop set point includes:
acquiring load three-phase voltage and load three-phase current;
carrying out phase-locked loop on the load three-phase voltage to obtain a phase angle;
performing dq conversion on the phase angle and the load three-phase current to obtain d-axis current and q-axis current;
and the active voltage is obtained by performing active current loop control on the active current loop given value and the d-axis current.
Preferably, obtaining the reactive voltage from the reactive current loop set point comprises:
and obtaining the reactive voltage by performing the reactive current loop control on the reactive current loop given value and the q-axis current.
Preferably, said generating said PWM wave by said active voltage and said reactive voltage comprises:
performing dq inverse transformation on the active voltage, the reactive voltage and the phase angle to obtain an inverse transformation result;
voltage feed forward control is introduced into the inverse transformation result to generate the PWM.
In order to solve the technical problem, the present application further provides a control device for a sagging feature of a bidirectional converter, including:
the acquisition module is used for acquiring the output power of the bidirectional converter, the output power of the diode rectifier unit, a voltage given value and a load voltage actual value;
the calculation module is used for calculating a voltage instruction value through the output power of the bidirectional converter and the output power of the diode rectifier unit;
the control module is used for sequentially performing voltage loop control and current loop control on the voltage given value, the load voltage actual value and the voltage command value so as to generate PWM waves;
and the adjusting module is used for adjusting the duty ratio of the PWM wave so that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit.
In order to solve the technical problem, the application also provides a control device for the sagging characteristic of the bidirectional converter, which comprises a memory for storing a computer program;
and the processor is used for realizing the control method of the sagging characteristic of the bidirectional converter when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer readable storage medium, where a computer program is stored, where the computer program is executed by a processor, and the steps of the method for controlling the droop characteristic of the bidirectional converter are provided.
The invention provides a control method for sagging characteristics of a bidirectional converter, which comprises the following steps: obtaining the output power of a bidirectional converter, the output power of a diode rectifier unit, a voltage given value and a load voltage actual value; calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit; sequentially performing voltage loop control and current loop control on a voltage given value, a load voltage actual value and a voltage command value so as to generate PWM waves; and the duty cycle of the PWM wave is adjusted so that the output power of the bi-directional converter is equal to the output power of the diode rectifier unit. Therefore, the technical scheme provided by the application generates PWM waves based on the double-loop control of the voltage loop and the current loop, and realizes that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through the adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, so that the current sharing of the parallel operation of the bidirectional converter and the diode rectifier unit is realized, the cooperative power supply of the bidirectional converter and the diode rectifier unit is ensured, and the redundancy and the reliability of the urban rail transit power supply system are improved.
In addition, the application also provides a control device and a medium for the sagging characteristic of the bidirectional converter, which correspond to the control method for the sagging characteristic of the bidirectional converter, and have the same effects.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for controlling droop characteristics of a bidirectional converter according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a traction power supply provided by an embodiment of the present application;
fig. 3 is a control block diagram of a bi-directional converter droop feature according to an embodiment of the present application;
fig. 4 is a graph of a droop coefficient of a bidirectional converter according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a control device for droop characteristics of a bidirectional converter according to an embodiment of the present application;
fig. 6 is a block diagram of a control device for controlling droop characteristics of a bidirectional converter according to another embodiment of the present application;
the reference numerals are as follows: and 1 is a bidirectional converter, and 2 is a diode rectifier unit.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the application is to provide a control method, a device and a medium for the sagging characteristic of the bidirectional converter, which are used for realizing that the output power of the bidirectional converter is equal to the output power of a diode rectifier unit, namely, realizing the current sharing of the parallel operation of the bidirectional converter and the diode rectifier unit.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
In urban rail transit, the traction power supply mode based on the combination of a bidirectional converter and a diode rectifier unit is generally adopted for the traction power supply of the train. When the train is braked, the bidirectional converter works in a feedback mode, and regenerative braking energy is quickly fed back to the AC power grid side in an inversion mode. When the train is started, the bidirectional converter works in a rectification mode and realizes traction power supply of the train together with the diode rectifier unit.
At present, the bidirectional converter has the output external characteristic of voltage stabilization, but the output characteristic of the diode rectifier unit naturally sags, so that the output power of the bidirectional converter is unequal to the output power of the diode rectifier unit, and the problem that active loads of the bidirectional converter and the diode rectifier unit are unevenly distributed is further caused, namely, the current sharing problem of parallel operation of the bidirectional converter and the diode rectifier unit is caused.
In order to solve the technical problem, the current sharing of parallel operation of the bidirectional converter and the diode rectifier unit is realized, the application provides a control method for the sagging characteristic of the bidirectional converter, PWM waves are generated based on double-loop control of a voltage loop and a current loop, the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, and then the current sharing of parallel operation of the bidirectional converter and the diode rectifier unit is realized.
Fig. 1 is a flowchart of a method for controlling droop characteristics of a bidirectional converter according to an embodiment of the present application, as shown in fig. 1, the method includes:
s10: obtaining the output power of a bidirectional converter, the output power of a diode rectifier unit, a voltage given value and a load voltage actual value;
fig. 2 is a circuit diagram of a traction power supply provided in an embodiment of the present application, as shown in fig. 2, a bidirectional converter 1 unit and a diode rectifier unit 2 are operated in parallel, and together provide traction power for a DC1500V locomotive load. In the embodiment, the bi-directional converter 1 has the output characteristics of voltage stabilization, but the output characteristics of the diode rectifier unit 2 naturally droop, so that the output power of the bi-directional converter 1 is different from the output power of the diode rectifier unit 2, so as to realize the automatic control of the droop characteristics of the bi-directional converter 1, that is, the adaptive adjustment of the droop coefficient in the droop control of the bi-directional converter 1. Therefore, in the implementation, the output power P1 of the bidirectional converter 1, the output power P2 of the diode-rectifier unit 2, the voltage setpoint value udc_ref, and the actual load voltage value udc_ fbk are acquired in real time.
The output power P1 of the bidirectional converter 1 and the output power P2 of the diode rectifier unit 2 are collected in real time through a voltage transformer and a current transformer to be supplied to a load, and therefore the voltage value and the current value collected by the voltage transformer and the current transformer are directly obtained and calculated to obtain the output power P1 and the output power P2.
S11: calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit;
in practice, after the output power P1 of the bidirectional converter 1 and the output power P2 of the diode rectifier unit 2 are obtained, an average power is calculated according to pavg= (p1+p2)/2, where Pavg is the average power. At this time, the current sharing coefficient k=p1/p2. Further, the voltage command value u2dc_ref is calculated from the output power P1 and the average power Pavg of the bidirectional converter 1.
S12: sequentially performing voltage loop control and current loop control on a voltage given value, a load voltage actual value and a voltage command value so as to generate PWM waves;
s13: the duty cycle of the PWM wave is adjusted so that the output power of the bi-directional converter is equal to the output power of the diode rectifier unit.
After the voltage set value udc_ref, the load voltage actual value udc_ fbk and the voltage command value u2dc_ref are obtained through the step S10 and the step S11, the voltage loop control and the current loop control are performed on the voltage set value udc_ref, the load voltage actual value udc_ fbk and the voltage command value u2dc_ref, so that the PWM wave for driving the bidirectional converter 1 is generated.
It can be understood that the change of the duty ratio of the PWM wave may cause the change of the load voltage and current, and the load voltage and current may adjust the duty ratio of the PWM wave through the droop coefficient adaptive adjustment strategy provided in the present application, that is, by adjusting the duty ratio of the PWM wave, the output power of the bidirectional converter 1 is equal to the output power of the diode rectifier unit 2, so as to achieve automatic current sharing.
The control method for the sagging characteristic of the bidirectional converter provided by the embodiment of the application comprises the following steps: obtaining the output power of a bidirectional converter, the output power of a diode rectifier unit, a voltage given value and a load voltage actual value; calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit; sequentially performing voltage loop control and current loop control on a voltage given value, a load voltage actual value and a voltage command value so as to generate PWM waves; and the duty cycle of the PWM wave is adjusted so that the output power of the bi-directional converter is equal to the output power of the diode rectifier unit. Therefore, the technical scheme provided by the application generates PWM waves based on the double-loop control of the voltage loop and the current loop, and realizes that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through the adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, so that the current sharing of the parallel operation of the bidirectional converter and the diode rectifier unit is realized, the cooperative power supply of the bidirectional converter and the diode rectifier unit is ensured, and the redundancy and the reliability of the urban rail transit power supply system are improved.
As a preferred embodiment, calculating the voltage command value by the output power of the bidirectional converter and the output power of the diode-rectifier unit includes:
calculating the average power of the output power of the bidirectional converter and the output power of the diode rectifier unit;
and performing PI control on the difference value between the average power and the output power of the bidirectional converter to obtain a voltage command value.
Fig. 3 is a control block diagram of a droop characteristic of a bi-directional converter according to an embodiment of the present application, where in implementation, average power Pavg is calculated according to pavg= (p1+p2)/2, where P1 is output power of the bi-directional converter and P2 is output power of a diode rectifier unit. Further, as shown in fig. 3, the voltage command value u2dc_ref is obtained by PI control of the average power Pavg and the output power P1 of the bidirectional converter. The calculation formula of the voltage command value U2dc_ref is as follows:
U2dc_ref＝[Kp1-(Pavg-P2)*(Dp+Di/S)]*Pavg
wherein Kp1 is the droop coefficient of the bidirectional converter, dp and Di are the proportional coefficient and the integral coefficient of the PI regulator respectively, and S is a differential operator.
According to the control method for the sagging characteristic of the bidirectional converter, after the output power of the bidirectional converter, the output power of the diode rectifier unit, the voltage given value and the actual load voltage value are obtained, the voltage command value is calculated through the output power of the bidirectional converter and the output power of the diode rectifier unit. Therefore, the method and the device can realize the subsequent voltage loop control and current loop control according to the voltage command value to generate PWM waves, namely, the current sharing of the parallel operation of the bidirectional converter and the diode rectifier unit is realized, and the redundancy and the reliability of the urban rail transit power supply system are improved.
Further, sequentially performing voltage loop control and current loop control on the voltage set point, the load voltage actual value and the voltage command value to generate the PWM wave includes:
carrying out voltage loop control on a voltage given value, a load voltage actual value and a voltage command value to obtain an active current loop given value;
acquiring a reactive current loop given value;
obtaining active voltage according to the active current loop set value, and obtaining reactive voltage according to the reactive current loop set value;
the PWM wave is generated by an active voltage and a reactive voltage.
In a specific embodiment, as shown in fig. 3, the current loop control includes active current loop control and reactive current loop control, and the bidirectional converter set obtains the active current loop set value id_ref by performing voltage loop control on the voltage set value udc_ref, the load voltage actual value udc_ fbk, and the voltage command value u2dc_ref.
After the reactive current loop given value Iq_ref is obtained, the active voltage Ud is obtained according to the active current loop given value Id_ref, and the reactive voltage Uq is obtained according to the reactive current loop given value Iq_ref. Specifically, as shown in fig. 3, load three-phase voltage and load three-phase current are obtained first, the obtained load three-phase voltage is subjected to phase-locked loop to obtain a phase angle Wt, and the phase angle Wt and the load three-phase current are subjected to dq conversion to obtain d-axis current id_ fbk and q-axis current iq_ fbk respectively.
Further, the active current loop set value Id_ref and the d-axis current id_ fbk pass through the active current loop to obtain an active voltage Ud, and the reactive current loop set value Iq_ref and the q-axis current iq_ fbk pass through the reactive current loop to obtain a reactive voltage Uq.
In a specific embodiment, generating the PWM wave from the active voltage and the reactive voltage comprises:
the dq inverse transformation is carried out on the active voltage, the reactive voltage and the phase angle to obtain an inverse transformation result;
voltage feed forward control is introduced into the inverse transform result to generate PWM.
As shown in fig. 3, the active voltage Ud, the reactive voltage Uq and the phase angle Wt obtained in the above steps are subjected to dq inverse transformation, and voltage feedforward control is introduced at the output result of the inverse transformation, so as to generate PWM waves for driving the bidirectional converter, in the implementation, the output power P1 of the bidirectional converter and the output power P2 of the diode rectifier unit are both equal to the average power Pavg by adjusting the duty ratio of the PWM waves, so that automatic current sharing is realized.
Fig. 4 is a graph of droop coefficients of a bidirectional converter according to an embodiment of the present application, and in order to facilitate a better understanding of the technical solutions provided by the present application, the following detailed description is intended with reference to fig. 4. As shown in fig. 4, U1k is the no-load dc side voltage of the bi-directional converter, NP1 is the line impedance of the bi-directional converter, P1 is the output power of the bi-directional converter, and KP1 is the operational droop characteristic of the bi-directional converter. U2k is the no-load direct current side voltage of the diode rectifier unit, np2 is the line impedance of the diode rectifier unit, P2 is the output power of the diode rectifier unit, and KP2 is the working droop characteristic curve of the diode rectifier unit. Pavg is the average power of the bidirectional converter and the diode rectifier unit, P0 is the corresponding power when the diode rectifier unit turns over voltage, udn is the rated voltage of the diode rectifier unit, and KP' is the sagging characteristic curve of the bidirectional converter after adjustment.
Udn is the rated voltage of the diode rectifier unit, NP1 is the line impedance of the bidirectional converter, and Np2 is the line impedance of the diode rectifier unit. P0 is the corresponding power when the diode rectifier unit turns over voltage. The points (U1, P1) are initial working points before the bi-directional converter does not adjust the droop coefficient, the points (U1', pavg) are working points after the droop coefficient is adjusted, and the points (U2, P2) are initial working points of the diode rectifier unit.
Initially, the operating point of the bidirectional converter is at the point (U1, P1), the operating point of the diode rectifier unit is at the point (U2, P2), KP1 is the operating droop characteristic of the bidirectional converter, KP2 is the operating droop characteristic of the diode rectifier unit, and since the line impedances of the bidirectional converter and the diode rectifier unit are not equal (i.e., np1+.np2), and the no-load voltages are also not equal (i.e., uk1+.uk2), the output power P1 of the bidirectional converter and the output power P2 of the diode rectifier unit are also not equal, and in general, P1> P2, no current sharing is achieved. The average power Pavg (wherein pavg= (p1+p2)/2) is taken as a given value, and is differenced from P1 to obtain a difference value, so as to adjust the droop coefficient of the bidirectional converter.
When P1> Pavg, the output value after PI adjustment is a negative value, and since Kp1 is a positive value, the droop coefficient of the bidirectional converter performs PI adjustment, kp1 increases to Kp ', that is, the curve Kp1 becomes the curve Kp' through control of the adaptive droop coefficient. When p1=pavg, the output power of the bidirectional converter is gradually stabilized, so that the output power P1 of the bidirectional converter and the output power P2 of the diode rectifier unit are equal to the average power Pavg, and at the moment, the current sharing coefficient k=p1/p2=1, thereby realizing power sharing.
According to the control method for the sagging characteristic of the bidirectional converter, PWM waves are generated based on double-loop control of the voltage loop and the current loop, the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, so that current sharing of parallel operation of the bidirectional converter and the diode rectifier unit is achieved, cooperative power supply of the bidirectional converter and the diode rectifier unit is guaranteed, and redundancy and reliability of an urban rail transit power supply system are improved.
In the above embodiments, the detailed description is given of the control method of the droop characteristic of the bidirectional converter, and the application further provides a corresponding embodiment of the control device of the droop characteristic of the bidirectional converter. It should be noted that the present application describes an embodiment of the device portion from two angles, one based on the angle of the functional module and the other based on the angle of the hardware structure.
Fig. 5 is a structural diagram of a control device for droop characteristics of a bidirectional converter according to an embodiment of the present application, as shown in fig. 5, the system includes:
the acquisition module 10 is used for acquiring the output power of the bidirectional converter, the output power of the diode rectifier unit, a voltage given value and a load voltage actual value;
the calculating module 11 is used for calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit;
a control module 12 for sequentially performing voltage loop control and current loop control on a voltage given value, a load voltage actual value, and a voltage command value so as to generate a PWM wave;
the adjusting module 13 is configured to adjust the duty ratio of the PWM wave so that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit.
Since the embodiments of the system portion and the embodiments of the method portion correspond to each other, the embodiments of the system portion refer to the description of the embodiments of the method portion, which is not repeated herein.
The control device for the sagging characteristic of the bidirectional converter provided by the embodiment of the application comprises: obtaining the output power of a bidirectional converter, the output power of a diode rectifier unit, a voltage given value and a load voltage actual value; calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit; sequentially performing voltage loop control and current loop control on a voltage given value, a load voltage actual value and a voltage command value so as to generate PWM waves; and the duty cycle of the PWM wave is adjusted so that the output power of the bi-directional converter is equal to the output power of the diode rectifier unit. Therefore, the technical scheme provided by the application generates PWM waves based on the double-loop control of the voltage loop and the current loop, and realizes that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through the adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, so that the current sharing of the parallel operation of the bidirectional converter and the diode rectifier unit is realized, the cooperative power supply of the bidirectional converter and the diode rectifier unit is ensured, and the redundancy and the reliability of the urban rail transit power supply system are improved.
Fig. 6 is a structural diagram of a control device for a droop characteristic of a bidirectional converter according to another embodiment of the present application, where, as shown in fig. 6, the control device for a droop characteristic of a bidirectional converter includes: a memory 20 for storing a computer program;
a processor 21 for implementing the steps of the control method of the bi-directional converter droop characteristics as mentioned in the above embodiments when executing a computer program.
The control device for the droop characteristic of the bidirectional converter provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.
Processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in hardware in at least one of a digital signal processor (Digital Signal Processor, abbreviated as DSP), a Field programmable gate array (Field-Programmable Gate Array, abbreviated as FPGA), and a programmable logic array (Programmable Logic Array, abbreviated as PLA). The processor 21 may also include a main processor and a coprocessor, the main processor being a processor for processing data in an awake state, also referred to as a central processor (Central Processing Unit, CPU for short); a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 may be integrated with an image processor (Graphics Processing Unit, GPU for short) for rendering and drawing of content required to be displayed by the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 20 may include one or more computer-readable storage media, which may be non-transitory. Memory 20 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used for storing a computer program 201, where the computer program, when loaded and executed by the processor 21, can implement the relevant steps of the control method for the droop characteristic of the bidirectional converter disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may further include an operating system 202, data 203, and the like, where the storage manner may be transient storage or permanent storage. The operating system 202 may include Windows, unix, linux, among others. The data 203 may include, but is not limited to, related data involved in a control method of the bi-directional current transformer droop characteristics, etc.
In some embodiments, the control device of the bi-directional converter droop characteristic may further include a display 22, an input/output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.
It will be appreciated by those skilled in the art that the configuration shown in fig. 6 is not limiting of the control means for the droop characteristics of the bi-directional current transformer and may include more or less components than those shown.
The control device for the sagging characteristic of the bidirectional converter provided by the embodiment of the application comprises a memory and a processor, wherein the processor can realize the following method when executing a program stored in the memory: a control method for droop characteristics of a bidirectional converter.
According to the control device for the sagging characteristic of the bidirectional converter, PWM waves are generated based on double-loop control of the voltage loop and the current loop, the output power of the bidirectional converter is equal to the output power of the diode rectifier unit through adjustment of the duty ratio of the PWM waves, namely, the sagging characteristic of the bidirectional converter is controlled, and then current sharing of parallel operation of the bidirectional converter and the diode rectifier unit is achieved, cooperative power supply of the bidirectional converter and the diode rectifier unit is guaranteed, and redundancy and reliability of an urban rail transit power supply system are improved.
Finally, the present application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps as described in the method embodiments above.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. With such understanding, the technical solution of the present application, or a part contributing to the prior art or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, performing all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The method, the device and the medium for controlling the sagging characteristic of the bidirectional converter are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are 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 variation 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method for controlling droop characteristics of a bi-directional converter, comprising:
obtaining the output power of a bidirectional converter, the output power of a diode rectifier unit, a voltage given value and a load voltage actual value;
calculating a voltage command value through the output power of the bidirectional converter and the output power of the diode rectifier unit;
sequentially performing voltage loop control and current loop control on the voltage set value, the load voltage actual value and the voltage command value so as to generate PWM waves;
and adjusting the duty ratio of the PWM wave so that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit.
2. The method of controlling droop characteristics of a bi-directional converter according to claim 1, wherein calculating a voltage command value from the output power of the bi-directional converter and the output power of the diode-rectifier unit comprises:
calculating the average power of the output power of the bidirectional converter and the output power of the diode rectifier unit;
and performing PI control on the difference value between the average power and the output power of the bidirectional converter to obtain the voltage command value.
3. The method of controlling droop characteristics of a bi-directional converter according to claim 1, wherein the current loop control includes active current loop control and reactive current loop control.
4. A control method of a droop characteristic of a bidirectional converter according to claim 3, wherein said sequentially performing voltage loop control and current loop control on the voltage set point, the actual load voltage value and the voltage command value to generate a PWM wave comprises:
performing voltage loop control on the voltage set value, the load voltage actual value and the voltage command value to obtain an active current loop set value;
acquiring a reactive current loop given value;
obtaining active voltage according to the active current loop set value, and obtaining reactive voltage according to the reactive current loop set value;
the PWM wave is generated by the active voltage and the reactive voltage.
5. The method of controlling droop characteristics of a bi-directional current transformer according to claim 4, wherein deriving an active voltage from the active current loop setpoint comprises:
acquiring load three-phase voltage and load three-phase current;
carrying out phase-locked loop on the load three-phase voltage to obtain a phase angle;
performing dq conversion on the phase angle and the load three-phase current to obtain d-axis current and q-axis current;
and the active voltage is obtained by performing active current loop control on the active current loop given value and the d-axis current.
6. The method of controlling droop characteristics of a bi-directional converter according to claim 5, wherein obtaining a reactive voltage based on the reactive current loop setpoint comprises:
and obtaining the reactive voltage by performing the reactive current loop control on the reactive current loop given value and the q-axis current.
7. The method of controlling a droop characteristic of a bi-directional converter according to claim 6, wherein said generating said PWM wave from said active voltage and said reactive voltage comprises:
performing dq inverse transformation on the active voltage, the reactive voltage and the phase angle to obtain an inverse transformation result;
voltage feed forward control is introduced into the inverse transformation result to generate the PWM.
8. A control device for a bi-directional converter droop characteristic, comprising:
the acquisition module is used for acquiring the output power of the bidirectional converter, the output power of the diode rectifier unit, a voltage given value and a load voltage actual value;
the calculation module is used for calculating a voltage instruction value through the output power of the bidirectional converter and the output power of the diode rectifier unit;
the control module is used for sequentially performing voltage loop control and current loop control on the voltage given value, the load voltage actual value and the voltage command value so as to generate PWM waves;
and the adjusting module is used for adjusting the duty ratio of the PWM wave so that the output power of the bidirectional converter is equal to the output power of the diode rectifier unit.
9. A control device for the droop characteristics of a bidirectional converter, comprising a memory for storing a computer program;
a processor for implementing the steps of the method for controlling the droop characteristics of a bi-directional converter according to any one of claims 1 to 7 when executing said computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method of controlling the droop characteristics of a bi-directional current transformer according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311527235.1A CN117578904A (en) | 2023-11-16 | 2023-11-16 | Control method, device and medium for sagging characteristic of bidirectional converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311527235.1A CN117578904A (en) | 2023-11-16 | 2023-11-16 | Control method, device and medium for sagging characteristic of bidirectional converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117578904A true CN117578904A (en) | 2024-02-20 |
Family
ID=89892901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311527235.1A Pending CN117578904A (en) | 2023-11-16 | 2023-11-16 | Control method, device and medium for sagging characteristic of bidirectional converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117578904A (en) |
-
2023
- 2023-11-16 CN CN202311527235.1A patent/CN117578904A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3217507B1 (en) | Secondary control method and apparatus of parallel inverters in micro grid | |
| CN107994825B (en) | Oscillation suppression method, system, device and readable storage medium | |
| US20040135538A1 (en) | Method and controller for field weakening operation of AC machines | |
| CN117578904A (en) | Control method, device and medium for sagging characteristic of bidirectional converter | |
| CN102751933A (en) | Motor torque boosting device | |
| US11799289B2 (en) | Grid-tied power generation system and grid-tied power fluctuation suppression device and method thereof | |
| CN104901598A (en) | Motor drive device, motor drive method and motor | |
| CN111416377B (en) | Flexible direct current control method and device for improving transient stability of power grid | |
| CN111555353B (en) | Distributed control method and device for micro-grid system and storage medium | |
| CN110148951B (en) | Double-target voltage coordination control method and control device for dynamic reactive power compensation device | |
| CN113224793A (en) | Micro-grid multi-inverter parallel connection self-adaptive harmonic impedance remodeling control method and system | |
| CN111864784A (en) | MMC-HVDC island power supply fault ride-through coordination control method and device | |
| CN116388283B (en) | Off-grid parallel operation control method and device for multi-mobile energy storage system | |
| CN113437916B (en) | Starting method and device of double-fed asynchronous motor control system | |
| CN112821417B (en) | Generator output power control method, device, storage medium and equipment | |
| CN117118255A (en) | Photovoltaic inverter control method, device and medium | |
| CN111786402B (en) | Method and device for switching reactive voltage control modes of flexible direct current transmission system | |
| CN116231724B (en) | Virtual inertia self-adaptive adjusting method of grid-structured inverter | |
| CN117977720A (en) | Net-structured wind generating set and control method thereof | |
| CN117638981A (en) | Control method and device for power grid frequency adjustment, electronic equipment and medium | |
| CN112186798A (en) | Distributed energy storage grid-connected inverter control system | |
| CN117728645A (en) | Converter control method and device, controller and storage medium | |
| CN115632442A (en) | Self-adaptive control method, device, equipment and medium | |
| CN115995947A (en) | Method, device and medium for inhibiting zero order harmonic current | |
| CN116260147A (en) | Negative sequence voltage steady-state control method and device for grid-structured flexible direct current system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |