Portable mobile power supply based on secondary equipment

Abstract

The utility model belongs to the field of direct-current power supplies, particularly relates to a portable mobile power supply based on secondary equipment, and aims to solve the problems of time and labor consumption, easy electric leakage and low temporary cable utilization rate of cable laying in the prior art. A first end of a filtering module is connected with a power grid, a second end of the filtering module is connected with a first end of a rectification module, a second end of the rectification module is connected with a first end of a direct current conversion module, and a second end of the direct current conversion module is connected with secondary equipment; a power grid is connected with the first end of the control module, the second end of the control module is connected with the third end of the rectifier module and the third end of the DC conversion module, and a line connecting the second end of the rectifier module and the first end of the DC conversion module is connected with the first end of the control module. According to the utility model, the workload of cable laying is reduced, manpower and time resources are saved, resource waste caused by disposable use of temporary cables is reduced, and the overall cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of DC power supply, and specifically relates to a portable mobile power supply based on secondary equipment. Background Technology

[0002] Currently, with the gradual expansion of the power grid, the number of new bay expansions and the replacement of aging secondary equipment in substations has increased dramatically. In the aforementioned actual work sites, there is a significant amount of installation and commissioning work involving newly constructed secondary equipment. During commissioning, errors such as incorrect wiring or cross-connections can lead to AC-DC misoperation or DC grounding, causing circuit breakers to malfunction and seriously threatening the safe and stable operation of the substation. According to the relevant acceptance technical documents issued by the State Grid Corporation, during the renovation and expansion acceptance process, the power supply for the secondary equipment to be commissioned should be provided by the test power supply panel, and the secondary equipment must not have any electrical connection with the operating equipment before acceptance is completed.

[0003] The current method of laying cables to draw power from the self-testing power panel involves a large workload during construction, consuming a lot of manpower and time resources. The operation steps are cumbersome, and the temporary cable connection is prone to leakage, which can cause damage to people and equipment. In addition, temporary cables are generally not reusable after use, resulting in great waste.

[0004] Based on this, the present invention proposes a portable mobile power supply based on secondary equipment. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, namely that the existing cable laying process is labor-intensive, consumes a lot of manpower and time resources, has complicated operation steps, and temporary cable access is prone to leakage, causing damage to personnel and equipment, and temporary cables generally cannot be reused after use, resulting in great waste, this utility model proposes a portable mobile power supply based on secondary equipment, including a filtering module, a rectifier module, a DC-DC converter module and a control module.

[0006] The first end of the filter module is connected to the power grid, the second end of the filter module is connected to the first end of the rectifier module, the second end of the rectifier module is connected to the first end of the DC-DC converter module, and the second end of the DC-DC converter module is connected to the secondary equipment.

[0007] The power grid is connected to the first end of the control module, the second end of the control module is connected to the third end of the rectifier module and the third end of the DC-DC converter module, and the line connecting the second end of the rectifier module and the first end of the DC-DC converter module is connected to the first end of the control module.

[0008] In some preferred embodiments, the control module includes a signal conditioning module, a controller, and a drive and isolated power supply module;

[0009] The power grid is also connected to the first terminal of the signal conditioning module, the second terminal of the signal conditioning module is connected to the first terminal of the controller, the second terminal of the controller is connected to the first terminal of the drive and isolation power supply module, and the second terminal of the drive and isolation power supply module is connected to the third terminal of the rectifier module and the third terminal of the DC-DC converter module, respectively.

[0010] The line connecting the second end of the rectifier module to the first end of the DC-DC converter module is connected to the first end of the signal conditioning module.

[0011] In some preferred embodiments, the filtering module includes three branches that are respectively connected to the three phases of the power grid, and each branch has a resistor and an inductor connected in series.

[0012] In some preferred embodiments, the rectifier module is a VIENNA rectifier circuit.

[0013] In some preferred embodiments, the DC-DC converter module is a Buck circuit.

[0014] In some preferred embodiments, the rectifier module and the DC-DC converter module are used to convert the three-phase AC voltage into a DC voltage available for secondary equipment.

[0015] In some preferred embodiments, the signal conditioning module is used to convert the AC side voltage of the power grid into a DC voltage for use by the controller.

[0016] In some preferred embodiments, the DC-DC converter module is used to reduce the output voltage of the rectifier module, so that the output voltage is converted to a DC voltage suitable for the secondary equipment by controlling the duty cycle.

[0017] The beneficial effects of this utility model are:

[0018] Simplified construction process: Compared with traditional cable laying methods, this utility model can significantly reduce the workload of cable laying, simplify the preparation work at the commissioning site, and save a lot of manpower and time resources.

[0019] Improved safety: It avoids leakage accidents caused by improper temporary cable connection and reduces the safety risks to personnel and equipment during commissioning.

[0020] Improved economic efficiency: Due to its portable design, this power bank can be reused, reducing the resource waste caused by the one-time use of traditional temporary cables and lowering the overall cost.

[0021] Easy to carry and deploy: The portable design allows the power supply to be quickly moved between different commissioning sites, improving work efficiency.

[0022] Precise voltage control: Through a feedforward decoupling control strategy, the stability and accuracy of the output voltage are ensured to meet the specific requirements of secondary equipment.

[0023] Enhanced adaptability: Applicable to various types of secondary equipment, improving the flexibility of on-site commissioning.

[0024] Optimized system architecture: By adopting VIENNA rectifier circuits and Buck circuits, combined with signal conditioning modules and controllers, a highly efficient energy conversion and control system is formed, ensuring the quality of the output voltage. Attached Figure Description

[0025] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of a portable mobile power supply based on secondary equipment according to this utility model;

[0027] Figure 2 This is a feedforward decoupling control block diagram of the control module in a portable power bank based on secondary equipment according to this utility model;

[0028] Figure 3 This is a control block diagram of a portable mobile power supply based on secondary equipment according to this utility model;

[0029] Figure 4 This is a structural diagram of a signal conditioning module in a portable power bank based on secondary equipment according to this utility model;

[0030] Figure 5 This is a structural diagram of the drive and isolation power module in a portable mobile power supply based on secondary equipment according to this utility model;

[0031] Figure 6 This is a block diagram of the feedforward decoupling control software control algorithm in a portable power supply based on secondary equipment according to this utility model. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 As shown, this utility model provides a portable mobile power supply based on secondary equipment, including a filtering module 1, a rectifier module 2, a DC-DC converter module 3, and a control module 4;

[0035] The first end of the filter module 1 is connected to the power grid 5, the second end of the filter module 1 is connected to the first end of the rectifier module 2, the second end of the rectifier module 2 is connected to the first end of the DC-DC converter module 3, and the second end of the DC-DC converter module 3 is connected to the secondary equipment 6.

[0036] The power grid 5 is connected to the first end of the control module 4. The second end of the control module 4 is connected to the third end of the rectifier module 2 and the third end of the DC-DC converter module 3, respectively. The line connecting the second end of the rectifier module 2 and the first end of the DC-DC converter module 3 is connected to the first end of the control module 4.

[0037] In this utility model, the control module 4 includes a signal conditioning module 41, a controller 42, and a drive and isolation power supply module 43;

[0038] The power grid 5 is also connected to the first end of the signal conditioning module 41, the second end of the signal conditioning module 41 is connected to the first end of the controller 42, the second end of the controller 42 is connected to the first end of the drive and isolation power supply module 43, and the second end of the drive and isolation power supply module 43 is connected to the third end of the rectifier module 2 and the third end of the DC-DC converter module 3, respectively.

[0039] The line connecting the second end of the rectifier module 2 to the first end of the DC-DC converter module 3 is connected to the first end of the signal conditioning module 41.

[0040] The filter module 1 includes three branches connected to the three-phase power supply of the power grid 5, each branch containing a resistor and an inductor connected in series. The resistor is... Figure 1 R in S The inductance is Figure 1 L in S .

[0041] The rectifier module 2 is a VIENNA rectifier circuit; the DC-DC converter module 3 is a Buck circuit.

[0042] The VIENNA rectifier circuit is controlled using closed-loop PWM control technology, and the control algorithm incorporates a closed-loop control algorithm based on feedforward decoupling.

[0043] The rectifier module 2 and the DC-DC converter module 3 are used to convert the three-phase AC voltage into DC voltage that can be used by the secondary equipment 6.

[0044] Specifically, the Buck circuit is used to reduce the high voltage output of the VIENNA rectifier circuit, so that the high voltage output is converted into a DC voltage suitable for secondary equipment through duty cycle control.

[0045] The signal conditioning module 41 in this invention is used to convert the AC side voltage of the power grid 5 into DC voltage for use by the controller 42.

[0046] The DC-DC converter module 3 in this invention is used to reduce the output voltage of the rectifier module 2, so that the output voltage is converted into a DC voltage suitable for the secondary equipment through duty cycle control.

[0047] like Figure 2 As shown, the VIENNA rectifier circuit converts AC to DC, requiring closed-loop control to ensure unity power factor and sinusoidal input current at all times. Voltage-oriented current decoupling control is widely used in rectifiers. For three-phase systems, controlling the AC to DC conversion via rotary converters greatly simplifies the algorithm complexity. Introducing a PI controller allows for the separate control of the dq-axis components of the three-phase voltage and current on the grid side of the VIENNA rectifier circuit, thereby achieving unity power factor operation of the converter.

[0048] In the dq coordinate system, the AC side voltage balance equation of the front-end VIENNA rectifier is:

[0049]

[0050] In the above equation, there is a coupling term between the d-axis current and the q-axis current, where L is the inductance, R is the resistance, ω is the frequency of the AC power supply, and i d and i q V represents the current on the d-axis and q-axis, respectively. d and v q U represents the voltage on the d-axis and q-axis, respectively. sd and u sq These represent the control signals on the d-axis and q-axis, respectively.

[0051] By introducing feedforward decoupling control of id and iq, and using a PI regulator as the current controller, the following relationship exists:

[0052]

[0053] Among them, K ip K is the proportionality coefficient. iI S is the integral coefficient, and S is the value of v under zero-state conditions. d and v q Laplace transform and i d and i q Functional relationships between Laplace transforms; The given value for the active current on the d-axis, This is the given value for the reactive current on the q-axis.

[0054] Depend on Figure 2 We can obtain:

[0055]

[0056] in, The target voltage value on the d-axis. This represents the target voltage value on the q-axis.

[0057] From the above formula, we can obtain:

[0058]

[0059] As can be seen from the above equation, the decoupling algorithm completely decouples the currents id and iq, eliminating mutual coupling terms. The VIENNA rectifier circuit's control objective is to output a constant DC voltage; therefore, the deviation of the DC voltage is used as the given value for id, as shown in the following expression:

[0060]

[0061] in, For the desired DC voltage, U dc This is the actual measured DC voltage.

[0062] like Figure 3 As shown, the portable power supply for substation secondary equipment samples the DC side voltage as the voltage outer loop feedback value. The difference between the given voltage and the feedback voltage is passed through a PI regulator to serve as the active current setpoint i for the current inner loop. d * reactive current given value i q * Setting it to zero means that the reactive component of the control input current is set to zero, so that the entire power supply operates at unity power factor, minimizing the reactive power loss of the DC power supply. The output of the VIENNA rectifier circuit serves as the input of the Buck circuit. By adjusting the duty cycle of the Buck circuit's switching transistors, a step-down voltage is achieved to provide a suitable DC voltage to the secondary equipment.

[0063] like Figure 4 As shown, the main function of the signal conditioning circuit is to convert the voltage signal (±5V) output by the Hall sampling into a level signal (0-3.3V) acceptable to the DSP and complete linear operations. Its structure is existing technology and will not be described in detail here.

[0064] like Figure 5As shown, the drive and isolation power supply circuit is used for the switching drive signals of the VIENNA rectifier circuit and Buck circuit. Its working principle is as follows: A PWM drive signal that needs amplification (taking TP as an example) is connected to pin 3 of the driver chip HCPL-3120. The driver DRV is connected to pin 2 of the 3120 via a resistor, and is active low. When the drive is working, A is low, turning on the PNP transistor, and DRV is pulled to +5V. At this time, the IGBT's on / off state is controlled by controlling the PWM drive signal: ① When PWM is high, the LED is off, the voltage at pins 6 and 7 is clamped to VEE, the output is 0V, the Zener diode's reverse voltage is -10V applied across the IGBT's g and e terminals, and the IGBT is off; ② When PWM is low, the LED is on, the voltage at pins 6 and 7 is clamped to VCC, the voltage across the IGBT's g and e terminals is +15V, and the IGBT is on. The drive circuit shares a common optocoupler primary winding.

[0065] like Figure 6 As shown, the VIENNA rectifier control algorithm is implemented in an interrupt subroutine, using the periodic interrupt of timer TxPR to implement the voltage-oriented current decoupling control algorithm for the VIENNA rectifier circuit. First, the three-phase input voltage, current, and output voltage on the grid side are sampled. Active and reactive currents are obtained through coordinate transformation. Then, the output value of the voltage loop is used as the active current reference, while the reactive current reference is set to zero. After current decoupling control, the reference signal is obtained, and the three-phase reference is obtained through inverse coordinate transformation. Finally, the six comparison registers CMPR are updated in real time, the context is restored, and the program returns to the main program.

[0066] To verify the power supply reliability of portable mobile power supplies for substation secondary equipment, 40 secondary devices were selected at the maintenance site for power supply testing, as shown in Table 1:

[0067] Table 1:

[0068]

[0069]

[0070] The test results show that the portable mobile power supply for substation secondary equipment can achieve 100% successful power supply for different manufacturers and devices.

[0071] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0072] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0073] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0074] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A portable power bank based on a secondary device, characterized in that, It includes a filter module (1), a rectifier module (2), a DC-DC converter module (3), and a control module (4); The first end of the filter module (1) is connected to the power grid (5), the second end of the filter module (1) is connected to the first end of the rectifier module (2), the second end of the rectifier module (2) is connected to the first end of the DC-DC converter module (3), and the second end of the DC-DC converter module (3) is connected to the secondary equipment (6). The power grid (5) is connected to the first end of the control module (4), the second end of the control module (4) is connected to the third end of the rectifier module (2) and the third end of the DC-DC converter module (3), and the line connecting the second end of the rectifier module (2) and the first end of the DC-DC converter module (3) is connected to the first end of the control module (4).

2. A portable power bank based on a secondary device according to claim 1, characterized in that, The control module (4) includes a signal conditioning module (41), a controller (42), and a drive and isolation power supply module (43); The power grid (5) is also connected to the first end of the signal conditioning module (41), the second end of the signal conditioning module (41) is connected to the first end of the controller (42), the second end of the controller (42) is connected to the first end of the drive and isolation power supply module (43), and the second end of the drive and isolation power supply module (43) is connected to the third end of the rectifier module (2) and the third end of the DC-DC converter module (3), respectively. The line connecting the second end of the rectifier module (2) to the first end of the DC-DC converter module (3) is connected to the first end of the signal conditioning module (41).

3. A portable power bank based on a secondary device according to claim 1, characterized in that, The filtering module (1) includes three branches that are respectively connected to the three-phase power grid (5), and each branch has a resistor and an inductor connected in series.

4. A portable power bank based on a secondary device according to claim 1, characterized in that, The rectifier module (2) is a VIENNA rectifier circuit.

5. A portable power bank based on a secondary device according to claim 1, characterized in that, The DC-DC converter module (3) is a Buck circuit.

6. A portable power bank based on a secondary device according to claim 1, characterized in that, The rectifier module (2) and the DC-DC converter module (3) are used to convert the three-phase AC voltage into a DC voltage available for the secondary equipment (6).

7. A portable power bank based on a secondary device according to claim 2, characterized in that, The signal conditioning module (41) is used to convert the AC side voltage of the power grid (5) into DC voltage for use by the controller (42).

8. A portable power bank based on a secondary device according to claim 2, characterized in that, The DC-DC converter module (3) is used to reduce the output voltage of the rectifier module (2) so that the output voltage is converted into DC voltage for the secondary equipment by the duty cycle control.

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