A method and system for quickly controlling energy consumption devices based on limit value approximation method

Abstract

The present application proposes a method and system for controlling the rapid commissioning of energy-consuming devices based on the limit approximation method, the method comprising: real-time monitoring of the DC voltage of an offshore wind power flexible direct current transmission system connected to an energy-consuming device; when it is monitored that the DC voltage of the flexible direct current transmission system is greater than the first DC voltage threshold corresponding to the flexible direct current transmission system, the limit approximation method is used to determine the energy-consuming resistor value required for the energy-consuming device; and the energy-consuming device is controlled to be rapidly commissioned based on the energy-consuming resistor value required for the energy-consuming device. The technical solution proposed in the present application can significantly reduce the switching frequency of the energy-consuming device, extend the service life of the energy-consuming device, and realize the dynamic regulation of the power absorption of the energy-consuming device.

Description

Technical Field

[0001] The present application relates to the field of wind power prediction, and in particular to a method and system for quickly controlling the operation of an energy-consuming device based on a limit value approximation method. Background Art

[0002] In the flexible direct current transmission system for offshore wind farms, AC energy consumption devices are installed on the wind farm side to balance the surplus power. The energy consumption devices are mainly divided into centralized energy consumption devices and distributed energy consumption devices. The control strategy of centralized energy consumption devices is simple, but the size of the energy consumption power cannot be actively controlled during the energy consumption process, which may cause large fluctuations in the DC voltage and affect the system operation characteristics; the distributed energy consumption device adopts a modular DC device topology structure, which can effectively dissipate the surplus power in terms of function. The power consumption of the entire device can be controlled by controlling the number of sub-modules put into use during the energy consumption period of the device, but it will cause the DC energy consumption device to be repeatedly switched on and off during the energy consumption period, which is not conducive to the stability of the system and damages the service life of the device. Summary of the invention

[0003] The present application provides a method and system for quickly controlling the energy consumption device based on a limit approximation method, so as to at least solve the technical problem that a DC energy consumption device is repeatedly switched on and off during energy consumption, which is not conducive to the stability of the system and damages the service life of the device.

[0004] The first embodiment of the present application proposes a method for quickly controlling an energy consumption device based on a limit value approximation method, the method comprising:

[0005] Real-time monitoring of the DC voltage of the offshore wind power flexible direct current transmission system connected to energy consumption devices;

[0006] When it is monitored that the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, the energy dissipation resistance value required for the energy dissipation device is determined by using the limit value approximation method;

[0007] The energy consuming device is controlled to be quickly put into operation based on the energy consuming resistance value required to be put into operation by the energy consuming device.

[0008] Preferably, the first DC voltage threshold is the DC voltage upper limit value of the offshore wind power flexible DC transmission system.

[0009] Preferably, when it is monitored that the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, the energy dissipation resistance value required to be invested in the energy dissipation device is determined by the limit value approximation method, including:

[0010] Step F1: when the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, determine that the energy dissipation resistor value required to be invested is an energy dissipation resistor with half the power of the energy dissipation device;

[0011] Step F2: Real-time monitoring of the DC voltage of the flexible DC transmission system after adjustment in step F1. If the DC voltage of the flexible DC transmission system rises and is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, proceed to step F3; if the DC voltage of the flexible DC transmission system drops and the dropped DC voltage is less than the second DC voltage threshold corresponding to the flexible DC transmission system, proceed to step F4;

[0012] Step F3: increasing the energy dissipation resistance value required to be invested and the increased value is one half of the remaining power energy dissipation resistance of the energy dissipation device until the DC voltage is maintained within a preset range;

[0013] Step F4: reducing the energy-consuming resistance value required to be invested and the reduced value is half of the power energy-consuming resistance already invested in the energy-consuming device until the DC voltage is maintained within a preset range.

[0014] Furthermore, the second DC voltage threshold is the lower limit of the DC voltage of the offshore wind power flexible DC transmission system.

[0015] The second embodiment of the present application proposes a fast start-up control system for an energy consumption device based on a limit value approximation method, the system comprising:

[0016] Monitoring module, used to monitor the DC voltage of the offshore wind power flexible direct current transmission system connected to the energy consumption device in real time;

[0017] A determination module, used to determine the energy-consuming resistance value required to be invested in the energy-consuming device by using a limit value approximation method when it is monitored that the DC voltage of the flexible DC transmission system is greater than a first DC voltage threshold corresponding to the flexible DC transmission system;

[0018] The control module is used to control the energy consumption device to be quickly put into use based on the energy consumption resistance value required for the energy consumption device.

[0019] Preferably, the first DC voltage threshold is the DC voltage upper limit value of the offshore wind power flexible DC transmission system.

[0020] Furthermore, the determination module is specifically used for:

[0021] Step E1: when the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, determine that the energy dissipation resistor value required to be invested is an energy dissipation resistor with half the power of the energy dissipation device;

[0022] Step E2: Real-time monitoring of the DC voltage of the flexible DC transmission system after adjustment in step E1. If the DC voltage of the flexible DC transmission system rises and is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, proceed to step E3; if the DC voltage of the flexible DC transmission system drops and the dropped DC voltage is less than the second DC voltage threshold corresponding to the flexible DC transmission system, proceed to step E4;

[0023] Step E3: increasing the energy dissipation resistance value required to be invested and the increased value is one half of the remaining power energy dissipation resistance of the energy dissipation device until the DC voltage is maintained within a preset range;

[0024] Step E4: reducing the energy-consuming resistance value required to be invested and the reduced value is one half of the power energy-consuming resistance already invested in the energy-consuming device until the DC voltage is maintained within a preset range.

[0025] Furthermore, the second DC voltage threshold is the lower limit of the DC voltage of the offshore wind power flexible DC transmission system.

[0026] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in the first aspect is implemented.

[0027] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect of the present application.

[0028] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0029] The present application proposes a method and system for controlling the rapid commissioning of energy-consuming devices based on the limit approximation method, the method comprising: real-time monitoring of the DC voltage of an offshore wind power flexible direct current transmission system connected to an energy-consuming device; when it is monitored that the DC voltage of the flexible direct current transmission system is greater than the first DC voltage threshold corresponding to the flexible direct current transmission system, the limit approximation method is used to determine the energy-consuming resistor value required for the energy-consuming device; and the energy-consuming device is controlled to be rapidly commissioned based on the energy-consuming resistor value required for the energy-consuming device. The technical solution proposed in the present application can significantly reduce the switching frequency of the energy-consuming device, extend the service life of the energy-consuming device, and realize the dynamic regulation of the power absorption of the energy-consuming device.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 A flowchart of a method for quickly starting up an energy-consuming device based on a limit value approximation method according to an embodiment of the present application;

[0033] Figure 2 A schematic diagram of an offshore wind power flexible direct current transmission system connected to an energy consumption device provided according to an embodiment of the present application;

[0034] Figure 3 A structural diagram of an energy consumption device provided according to an embodiment of the present application;

[0035] Figure 4 A structural diagram of a control system for rapidly starting up an energy-consuming device based on a limit value approximation method according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] The present application proposes a method and system for controlling the rapid commissioning of energy-consuming devices based on the limit approximation method, the method comprising: real-time monitoring of the DC voltage of an offshore wind power flexible direct current transmission system connected to an energy-consuming device; when it is monitored that the DC voltage of the flexible direct current transmission system is greater than the first DC voltage threshold corresponding to the flexible direct current transmission system, the limit approximation method is used to determine the energy-consuming resistor value required for the energy-consuming device; and the energy-consuming device is controlled to be rapidly commissioned based on the energy-consuming resistor value required for the energy-consuming device. The technical solution proposed in the present application can significantly reduce the switching frequency of energy-consuming devices, extend the service life of energy-consuming devices, and realize dynamic regulation of the power absorption of energy-consuming devices.

[0038] The following describes a method and system for quickly controlling an energy-consuming device based on a limit value approximation method according to an embodiment of the present application with reference to the accompanying drawings.

[0039] Embodiment 1

[0040] Figure 1 A flowchart of a method for quickly starting up an energy-consuming device based on a limit value approximation method according to an embodiment of the present application is shown in FIG. Figure 1 As shown, the method includes:

[0041] Step 1: Real-time monitoring of the DC voltage of the offshore wind power flexible direct current transmission system connected to the energy consumption device; the schematic diagram of the offshore wind power flexible direct current transmission system connected to the energy consumption device is as follows Figure 2 As shown;

[0042] Step 2: When it is monitored that the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, the energy dissipation resistance value required for the energy dissipation device is determined by using the limit value approximation method;

[0043] Among them, the first DC voltage threshold is the DC voltage upper limit value of the offshore wind power flexible DC transmission system.

[0044] In the embodiment of the present disclosure, step 2 specifically includes:

[0045] Step F1: when the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, determine that the energy dissipation resistor value required to be invested is an energy dissipation resistor with half the power of the energy dissipation device;

[0046] Step F2: Real-time monitoring of the DC voltage of the flexible direct current transmission system after adjustment in step F1. If the DC voltage of the flexible direct current transmission system rises and is greater than the first DC voltage threshold corresponding to the flexible direct current transmission system, proceed to step F3; if the DC voltage of the flexible direct current transmission system drops and the dropped DC voltage is less than the second DC voltage threshold corresponding to the flexible direct current transmission system, proceed to step F4; wherein the second DC voltage threshold is the lower limit of the DC voltage of the offshore wind power flexible direct current transmission system;

[0047] Step F3: increasing the energy dissipation resistance value required to be invested and the increased value is one half of the remaining power energy dissipation resistance of the energy dissipation device until the DC voltage is maintained within a preset range;

[0048] Step F4: reducing the energy-consuming resistance value required to be invested and the reduced value is half of the power energy-consuming resistance already invested in the energy-consuming device until the DC voltage is maintained within a preset range.

[0049] Step 3: Controlling the energy consuming device to be quickly put into operation based on the energy consuming resistance value required for the energy consuming device.

[0050] It should be noted that the structure of the energy dissipation device can be as follows: Figure 3As shown, T1-T4 are fully controlled power electronic devices that can be turned on and off autonomously; L is a reactor; D1-D2 are diodes; and R is a concentrated resistor. When the system is operating normally, all energy-consuming devices are in the off state. When it is monitored that the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, the energy-consuming device is started, T1 and T4 are a group, and T2 and T3 are a group. The two groups are triggered to conduct at a certain frequency f. Since the inductor conducts DC and blocks AC, the switching frequency is set under different fault severity to achieve power absorption of the energy-consuming device.

[0051] In summary, the energy-consuming device rapid startup control method based on the limit approximation method proposed in this embodiment can significantly reduce the switching frequency of the energy-consuming device, extend the service life of the energy-consuming device, and realize dynamic adjustment of the power absorption of the energy-consuming device.

[0052] Embodiment 2

[0053] Figure 4 A structural diagram of a control system for rapidly launching an energy-consuming device based on a limit value approximation method according to an embodiment of the present application is shown in FIG. Figure 4 As shown, the system comprises:

[0054] The monitoring module 100 is used to monitor the DC voltage of the offshore wind power flexible direct current transmission system connected to the energy consumption device in real time;

[0055] The determination module 200 is used to determine the energy dissipation resistance value required to be invested in the energy dissipation device by using the limit value approximation method when it is monitored that the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system;

[0056] The control module 300 is used to control the energy consumption device to be quickly put into operation based on the energy consumption resistance value required for the energy consumption device.

[0057] In the disclosed embodiment of the present invention, the first DC voltage threshold is the DC voltage upper limit value of the offshore wind power flexible direct current transmission system.

[0058] In the embodiment of the present disclosure, the determination module 200 is specifically used to:

[0059] Step E1: when the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, determine that the energy dissipation resistor value required to be invested is an energy dissipation resistor with half the power of the energy dissipation device;

[0060] Step E2: Real-time monitoring of the DC voltage of the flexible DC transmission system after adjustment in step E1. If the DC voltage of the flexible DC transmission system rises and is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, proceed to step E3; if the DC voltage of the flexible DC transmission system drops and the dropped DC voltage is less than the second DC voltage threshold corresponding to the flexible DC transmission system, proceed to step E4;

[0061] Step E3: increasing the energy dissipation resistance value required to be invested and the increased value is one half of the remaining power energy dissipation resistance of the energy dissipation device until the DC voltage is maintained within a preset range;

[0062] Step E4: reducing the energy-consuming resistance value required to be invested and the reduced value is one half of the power energy-consuming resistance already invested in the energy-consuming device until the DC voltage is maintained within a preset range.

[0063] It should be noted that the second DC voltage threshold is the lower limit of the DC voltage of the offshore wind power flexible DC transmission system.

[0064] For example, when it is detected that the DC voltage of the offshore wind power flexible direct current transmission system is greater than the first DC voltage threshold, the power calculation link is cancelled, and the limit approximation method is used to directly put into use half the power energy-consuming resistance; when it is detected that the DC voltage drops rapidly and is less than the lower limit, the energy-consuming resistance value required to be put into use is reduced, and the reduction value is half of the power energy-consuming resistance already put into use by the energy-consuming device, and the DC voltage change value is observed. When the voltage is maintained within the allowable range and no longer fluctuates greatly, that is, the DC voltage fluctuates between the allowable upper and lower limits, the energy-consuming device is no longer adjusted; when it is detected that the DC voltage is still rising and exceeds the upper limit, the energy-consuming resistance value required to be put into use is increased, and the increase value is half of the remaining power energy-consuming resistance of the energy-consuming device, and the DC voltage change value is observed. When the voltage is maintained within the allowable range and no longer fluctuates greatly, the energy-consuming device is no longer adjusted; and so on, gradually approaching a reasonable energy consumption value.

[0065] In summary, the energy-consuming device rapid startup control system based on the limit approximation method proposed in this embodiment can significantly reduce the switching frequency of the energy-consuming device, extend the service life of the energy-consuming device, and realize dynamic adjustment of the power absorption of the energy-consuming device.

[0066] Embodiment 3

[0067] In order to implement the above embodiments, the present disclosure further proposes an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in Embodiment 1 is implemented.

[0068] Embodiment 4

[0069] In order to implement the above embodiments, the present disclosure further proposes a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in the first embodiment is implemented.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for quickly controlling energy consumption devices based on limit value approximation method, characterized in that: The method comprises: Real-time monitoring of the DC voltage of the offshore wind power flexible direct current transmission system connected to energy consumption devices; When it is monitored that the DC voltage of the flexible direct current transmission system is greater than the first DC voltage threshold corresponding to the flexible direct current transmission system, the energy dissipation resistance value required for the energy dissipation device is determined by the limit approximation method, and the first DC voltage threshold is the upper limit value of the DC voltage of the offshore wind power flexible direct current transmission system; Controlling the energy consuming device to be quickly put into operation based on the energy consuming resistance value required for the energy consuming device; When it is monitored that the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, the energy dissipation resistance value required to be invested in the energy dissipation device is determined by the limit value approximation method, including: Step F1: when the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, determine that the energy dissipation resistor value required to be invested is an energy dissipation resistor with half the power of the energy dissipation device; Step F2: Real-time monitoring of the DC voltage of the flexible DC transmission system after adjustment in step F1. If the DC voltage of the flexible DC transmission system rises and is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, proceed to step F3; if the DC voltage of the flexible DC transmission system drops and the dropped DC voltage is less than the second DC voltage threshold corresponding to the flexible DC transmission system, proceed to step F4; Step F3: increasing the energy dissipation resistance value required to be invested and the increased value is one half of the remaining power energy dissipation resistance of the energy dissipation device until the DC voltage is maintained within a preset range; Step F4: reducing the energy-consuming resistance value required to be invested and the reduction value is one-half of the power energy-consuming resistance already invested in the energy-consuming device until the DC voltage is maintained within a preset range; The second DC voltage threshold is the lower limit of the DC voltage of the offshore wind power flexible DC transmission system.

2. A fast-start control system for energy-consuming devices based on limit value approximation method, characterized in that: The system comprises: Monitoring module, used to monitor the DC voltage of the offshore wind power flexible direct current transmission system connected to the energy consumption device in real time; A determination module, for determining the energy dissipation resistance value required for the energy dissipation device by using a limit value approximation method when it is monitored that the DC voltage of the flexible DC transmission system is greater than a first DC voltage threshold corresponding to the flexible DC transmission system, wherein the first DC voltage threshold is an upper limit value of the DC voltage of the offshore wind power flexible DC transmission system; A control module, used for controlling the energy consuming device to be quickly put into operation based on the energy consuming resistance value required to be put into operation by the energy consuming device; The determination module is specifically used for: Step E1: when the DC voltage of the flexible DC transmission system is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, determine that the energy dissipation resistor value required to be invested is an energy dissipation resistor with half the power of the energy dissipation device; Step E2: Real-time monitoring of the DC voltage of the flexible DC transmission system after adjustment in step E1. If the DC voltage of the flexible DC transmission system rises and is greater than the first DC voltage threshold corresponding to the flexible DC transmission system, proceed to step E3; if the DC voltage of the flexible DC transmission system drops and the dropped DC voltage is less than the second DC voltage threshold corresponding to the flexible DC transmission system, proceed to step E4; Step E3: increasing the energy dissipation resistance value required to be invested and the increased value is one half of the remaining power energy dissipation resistance of the energy dissipation device until the DC voltage is maintained within a preset range; Step E4: Reduce the required energy-consuming resistance value and the reduction value is one-half of the power energy-consuming resistance already invested in the energy-consuming device until the DC voltage is maintained within a preset range. The second DC voltage threshold is the lower limit of the DC voltage of the offshore wind power flexible direct current transmission system.

3. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method according to claim 1 is implemented.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to claim 1 is implemented.

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