A storage and consumption integrated device based on fully controlled switch device and control method thereof

Abstract

The present application relates to a storage-consumption integrated device based on a fully-controlled switch device and a control method thereof, wherein the storage-consumption integrated device comprises a storage-consumption integrated module, a converter and an AC system, wherein the storage-consumption integrated module comprises N fully-controlled submodules connected in series, wherein the fully-controlled submodules comprise a first fully-controlled switch device, a first semiconductor device, a second fully-controlled switch device, a second semiconductor device, an energy storage element, a bypass switch and an energy consumption element; the first fully-controlled switch device of each fully-controlled submodule is controlled to be turned on, and the second fully-controlled switch device and the bypass switch are both turned off, then the corresponding fully-controlled submodule operates in an energy storage mode; the second fully-controlled switch device of each fully-controlled submodule is controlled to be turned on, and the first fully-controlled switch device and the bypass switch are both turned off, then the corresponding fully-controlled submodule operates in an energy consumption mode. The device can realize the operation of energy storage mode and energy consumption mode through the fully-controlled submodule, so that the device has functions such as reactive power support, voltage stability and energy balance.

Description

Technical Field

[0001] The present application relates to the technical field of converters, and in particular to a storage-consumption integrated device based on a fully-controlled switching device and a control method thereof. Background Art

[0002] With the rapid promotion of the dual-carbon strategy and the construction of new power systems, the power grid has and will continue to undergo profound changes. The proportion of new energy and power electronic equipment on the source-grid-load side has increased, and the power system is gradually transitioning to the "dual high" stage. The composition and characteristics of the power system have also changed. In addition to traditional stability, flow control, voltage control and other issues, it faces many new challenges: for example, with the access of large-scale new energy, energy storage and other power electronic equipment, the proportion of installed capacity of synchronous generators in the power system continues to decrease, and the power system is developing in the direction of low inertia and low damping. The regulation ability of the power system has seriously declined, the anti-disturbance ability is insufficient, and the safe and stable operation faces greater pressure; for example, with the increase in the proportion of new energy power generation and the long-distance transmission of large-scale new energy power generation through high-voltage direct current transmission, the energy balance at multiple time scales also faces new major challenges.

[0003] High-power power electronic devices have become an important means to improve the stability, power flow control and oscillation suppression of power systems. For example, flexible AC transmission technology based on high-power power electronics has played an important role in improving the stability level and transmission capacity of power grids. For the new "double-high" power system, power electronic technology will still be an important means to solve the above problems. However, the above-mentioned various problems of the new power system often occur concurrently or in a chain, and there are complex interactions. Existing power electronic devices are usually limited to a single function or a small number of functions. Conventional solutions face many technical and economic challenges such as a significant increase in system volume, land occupation, and cost, and difficulty in achieving large-scale and fast-changing power / energy balance control. Therefore, power equipment with comprehensive power grid management capabilities has become a new demand to support the construction and operation of new power systems. Existing high-power power electronic devices (STATCOM, SVG) cannot simultaneously achieve multiple functions such as reactive support, voltage stability, and energy balance. Summary of the invention

[0004] The embodiments of the present application provide a storage and consumption integrated device based on a fully-controlled switching device and a control method thereof, which are used to solve the technical problem that existing high-power power electronic devices cannot simultaneously achieve multiple functions such as reactive power support, voltage stability, and energy balance.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] On the one hand, a storage-consumption integrated device based on a fully-controlled switch device is provided, comprising a storage-consumption integrated module and a converter connected in parallel with the storage-consumption integrated module, the converter being connected to an AC system, the storage-consumption integrated module comprising N fully-controlled sub-modules connected in series, each of the fully-controlled sub-modules comprising a first fully-controlled switch device, a first semiconductor device, a second fully-controlled switch device, a second semiconductor device, an energy storage element, a bypass switch and an energy consumption element, the second end of the first fully-controlled switch device being respectively connected to the first end of the energy storage element and the second end of the second fully-controlled switch device, the first fully-controlled switch The third end of the device is connected to the first end of the bypass switch, the third end of the second fully-controlled switch device is connected to the first end of the energy-consuming element, the second end of the energy-consuming element is respectively connected to the second end of the bypass switch and the second end of the energy storage element, the first semiconductor device is connected in parallel to the second end and the third end of the first fully-controlled switch device, the second semiconductor device is connected in parallel to the second end and the third end of the second fully-controlled switch device, the first end of the first fully-controlled switch device and the first end of the second fully-controlled switch device are both connected to the control module; each of the fully-controlled sub-modules works independently.

[0007] Preferably, the first fully-controlled switching device and the second fully-controlled switching device both include MOS tubes, IGBT tubes, GTO tubes or GTR tubes.

[0008] Preferably, the energy storage element is a supercapacitor, the energy consumption element is a resistor, and the first semiconductor device and the second semiconductor device are both diodes.

[0009] On the other hand, a control method for a storage-consumption integrated device based on a fully-controlled switching device is provided, which is applied to the storage-consumption integrated device based on the fully-controlled switching device described above, and the control method comprises the following steps:

[0010] Obtain the power deficit and surplus power when an AC system fails;

[0011] If the power shortage is higher than the first power threshold value, the storage-consumption integrated module is controlled to operate in the energy storage mode;

[0012] If the surplus power is higher than the second power threshold value, the integrated storage and consumption module is controlled to operate in an energy consumption mode.

[0013] Preferably, controlling the integrated storage and consumption module to operate in the energy storage mode includes:

[0014] Obtaining the slope coefficient of the converter voltage drop, the converter steady-state DC voltage and capacitance data of the energy storage element, and obtaining the fault time when the AC system fails;

[0015] Obtaining a DC voltage reference value by calculation according to the shortfall power, the fault time, the steady-state DC voltage and the capacitance data;

[0016] Controlling the DC voltage output by the converter to drop according to the DC voltage reference value and the slope coefficient, and simultaneously controlling all first fully-controlled switch devices in the storage-consumption integrated module to turn on, second fully-controlled switch devices to turn off, and the energy storage element to discharge to the AC system, so as to provide active power;

[0017] After the AC system recovers to be stable, all the first fully-controlled switching devices and the second fully-controlled switching devices in the integrated storage and consumption module are controlled to be turned off, so that the integrated storage and consumption module exits the energy storage mode.

[0018] Preferably, after the integrated storage and consumption module exits the energy storage mode, the control method includes: if the DC voltage output by the converter recovers to a steady-state DC voltage, controlling all first semiconductor devices in the integrated storage and consumption module to charge the corresponding energy storage element so that the voltage of the energy storage element increases to a balanced voltage.

[0019] Preferably, the control method of the storage and consumption integrated device based on the fully controlled switch device includes: according to the shortfall power, the fault time, the steady-state DC voltage and the capacitance data, a DC voltage reference value is calculated using a voltage reference value formula, and the voltage reference value formula is: U dcref 2 =[0.5U dc 2 C*NP ref *t] / (0.5C*N), where t is the fault time in seconds; U dc is the steady-state DC voltage of the converter, C is the capacitance data of the energy storage element, N is the total number of fully controlled submodules in the energy storage and consumption integrated module, P ref The power shortage.

[0020] Preferably, controlling the integrated storage and consumption module to operate in an energy consumption mode comprises:

[0021] Obtaining the maximum transmission power of the integrated storage and consumption module; calculating the number of submodules to be put into use according to the total number of full-control submodules in the integrated storage and consumption module, the surplus power and the maximum transmission power;

[0022] Obtain the capacitor voltage of the energy storage element in each of the fully controlled submodules, and divide all the fully controlled submodules in the storage-consumption integrated module into energy-consuming submodules and non-energy-consuming submodules according to the capacitor voltage from high to low and the number of the input submodules;

[0023] Controlling all first fully-controlled switch devices in the energy-consuming input submodule to be turned off and all second fully-controlled switch devices to be turned on, and controlling all first fully-controlled switch devices and second fully-controlled switch devices in the non-energy-consuming input submodule to be turned off;

[0024] After the AC system recovers to be stable, all the first fully-controlled switching devices and the second fully-controlled switching devices in the integrated storage and consumption module are controlled to be turned off, so that the integrated storage and consumption module exits the energy consumption mode.

[0025] Preferably, the control method of the integrated storage and consumption device based on the fully controlled switch device comprises: using the module calculation formula to calculate the total number of fully controlled submodules in the integrated storage and consumption module, the surplus power and the maximum transmission power to obtain submodule data; using a further method to process the submodule data to obtain the number of submodules put into operation; the module calculation formula is N SM =(P surplus / P N )×N, where N SM is the submodule data, P surplus is the surplus power of the AC system when a fault occurs, P N is the maximum transmission power of the integrated storage and consumption module, and N is the total number of fully controlled submodules in the integrated storage and consumption module.

[0026] In another aspect, a terminal device is provided, comprising a processor and a memory;

[0027] The memory is used to store program codes and transmit the program codes to the processor;

[0028] The processor is used to execute the control method of the above-mentioned storage and consumption integrated device based on the fully-controlled switching device according to the instructions in the program code.

[0029] The storage-consumption integrated device based on a fully-controlled switch device and a control method thereof, the storage-consumption integrated device based on a fully-controlled switch device comprises a storage-consumption integrated module and a converter connected in parallel with the storage-consumption integrated module, the converter is connected to an AC system, the storage-consumption integrated module comprises N fully-controlled submodules connected in series, each fully-controlled submodule comprises a first fully-controlled switch device, a first semiconductor device, a second fully-controlled switch device, a second semiconductor device, an energy storage element, a bypass switch and an energy consumption element, the second end of the first fully-controlled switch device is respectively connected to the first end of the energy storage element and the second end of the second fully-controlled switch device, the third end of the first fully-controlled switch device is connected to the first end of the bypass switch, the third end of the second fully-controlled switch device is connected to the first end of the energy consumption element, the second end of the energy consumption element is respectively connected to the second end of the bypass switch and the second end of the energy storage element, the first semiconductor device is connected in parallel to the second end and the third end of the first fully-controlled switch device, and the second semiconductor device is connected in parallel to the second end and the third end of the second fully-controlled switch device. It can be seen from the above technical scheme that the embodiments of the present application have the following advantages: the integrated storage and consumption device based on the fully-controlled switching device can realize the operation of the energy storage mode and the energy consumption mode through the N fully-controlled sub-modules connected in series in the integrated storage and consumption module, so that the integrated storage and consumption device based on the fully-controlled switching device has the functions of reactive power support, voltage stability, energy balance and the like; it solves the technical problem that the existing high-power power electronic devices cannot realize multiple functions such as reactive power support, voltage stability, energy balance and the like at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 This is a circuit diagram of a storage-consumption integrated device based on a fully-controlled switch device according to an embodiment of the present application;

[0032] Figure 2 A flowchart of the steps of the control method of the storage and consumption integrated device based on the fully controlled switching device according to the embodiment of the present application;

[0033] Figure 3 A framework flow chart of the energy storage mode in the control method of the storage-consumption integrated device based on the fully-controlled switching device described in the embodiment of the present application;

[0034] Figure 4 A framework flow chart of the energy consumption mode in the control method of the storage and consumption integrated device based on the fully controlled switching device according to the embodiment of the present application;

[0035] Figure 5 A schematic diagram of a terminal device described in an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] The embodiment of the present application provides an integrated storage and consumption device based on a fully-controlled switching device and a control method thereof, which solves the technical problem that existing high-power power electronic devices cannot simultaneously achieve multiple functions such as reactive power support, voltage stability, and energy balance.

[0040] Embodiment 1:

[0041] Figure 1 This is a circuit diagram of the integrated storage and consumption device based on the fully-controlled switching device described in an embodiment of the present application.

[0042] like Figure 1As shown, the embodiment of the present application provides a storage-consumption integrated device based on a fully-controlled switch device, including a storage-consumption integrated module 10 and a converter 20 connected in parallel with the storage-consumption integrated module 10, the converter 20 is connected to an AC system 30, the storage-consumption integrated module 10 includes N fully-controlled sub-modules connected in series, each fully-controlled sub-module includes a first fully-controlled switch device S1, a first semiconductor device D1, a second fully-controlled switch device S2, a second semiconductor device D2, an energy storage element C, a bypass switch S and an energy consumption element R, the second end of the first fully-controlled switch device S1 is respectively connected to the first end of the energy storage element C and the second fully-controlled switch device S2. The second end of the first fully-controlled switching device S1 is connected to the first end of the bypass switch S, the third end of the second fully-controlled switching device S2 is connected to the first end of the energy-consuming element R, the second end of the energy-consuming element R is respectively connected to the second end of the bypass switch S and the second end of the energy storage element C, the first semiconductor device D1 is connected in parallel to the second end and the third end of the first fully-controlled switching device S1, the second semiconductor device D2 is connected in parallel to the second end and the third end of the second fully-controlled switching device S2, the first end of the first fully-controlled switching device and the first end of the second fully-controlled switching device are both connected to the control module; each fully-controlled sub-module works independently.

[0043] It should be noted that the control module is used to control the full-control switch device to turn on or off. The N full-control sub-modules are respectively recorded as SM1, SM2, . . ., SM N . The converter 20 is used to provide a stable DC voltage to the AC system 30. The converter 20 can be a static synchronous compensator STATCOM, a reactive power compensation device SVG, a flexible DC, a new energy converter, etc. The structure and parameters of each fully controlled submodule are completely consistent. The storage and consumption integrated module 10 of the storage and consumption integrated device based on the fully controlled switching device is composed of N completely identical fully controlled submodules in series, so that the storage and consumption integrated module 10 is easy to use standard devices and has good expansibility, which is conducive to shortening the engineering establishment cycle of the storage and consumption integrated device based on the fully controlled switching device, and facilitating the improvement of the voltage level and the transmission power in the storage and consumption integrated device based on the fully controlled switching device. In this embodiment, the working states of each fully controlled submodule do not affect each other. The energy storage element C can be a supercapacitor, the energy consumption element R can be a resistor, and the first semiconductor device D1 and the second semiconductor device D2 can both be diodes. The anode of the first semiconductor device D1 is connected to the third end of the first fully controlled switching device S1, and the cathode of the first semiconductor device D1 is connected to the second end of the first fully controlled switching device S1. The anode of the second semiconductor device D2 is connected to the third end of the second fully-controlled switching device S2, and the cathode of the second semiconductor device D2 is connected to the second end of the second fully-controlled switching device S2.

[0044] In the embodiment of the present application, the first fully-controlled switch device S1 and the second fully-controlled switch device S2 can be fully-controlled switch devices that can be controlled on and off by signals, such as MOS tubes, IGBT tubes, turn-off thyristors GTO or power transistors GTR. Among them, the emitter of the IGBT tube serves as the third end of the first fully-controlled switch device S1 and the second fully-controlled switch device S2, and the collector of the IGBT tube serves as the second end of the first fully-controlled switch device S1 and the second fully-controlled switch device S2.

[0045] It should be noted that when the integrated storage and consumption device based on the fully-controlled switching device operates normally, the switching states of the first fully-controlled switching device S1 and the second fully-controlled switching device S2 should be in a complementary state.

[0046] In the embodiment of the present application, the bypass switch S is activated when an internal fault occurs in the fully controlled submodule, and is quickly closed to bypass it for timely replacement, and remains in an open state during normal operation. The first fully controlled switch device S1 is used to provide a path for the energy storage element C to discharge externally, ensuring the smooth discharge process of the energy storage element C; the first semiconductor device D1 anti-parallel to the first fully controlled switch device S1 provides a path for charging the energy storage element C, ensuring the smooth charging process of the energy storage element C, so as to balance the capacitor voltage of the energy storage element C. The second fully controlled switch device S2 is used to provide a path for the energy consumption element R to be put into operation, ensuring that the energy consumption element R consumes active power normally, and the second semiconductor device D2 anti-parallel to the second fully controlled switch device S2 will not flow current under any circumstances.

[0047] It should be noted that the integrated storage and consumption device based on fully controlled switching devices combines the advantages of reactive power support and voltage stability in existing high-power power electronic devices (STATCOM, SVG), integrates fully controlled switching devices and supercapacitors, and realizes the integration of multiple functions such as reactive power support, voltage stability, and energy balance, providing a new and effective integrated storage and consumption device for the many challenges faced by the new double-high power system. Compared with the existing converter with single-function management capability, the integrated storage and consumption device based on fully controlled switching devices has no less than 2 new functions, such as energy balance capabilities such as energy storage and energy consumption. Through the improvement of the control method, it can also realize functions such as inertial support and harmonic management. Compared with multiple management equipment, the integrated storage and consumption device based on fully controlled switching devices has great advantages in saving space and cost. The integrated energy storage and consumption device based on the fully controlled switching device adopts a modular design. Compared with the centralized energy consumption device based on IGBT or IGCT series valve, the integrated energy storage and consumption device based on the fully controlled switching device does not require the DC equivalent capacitor to directly provide power to the resistor due to the presence of energy storage elements in each full-bridge submodule. It will not cause large DC voltage fluctuations when it is put into operation, and there is no need to limit the control cycle. At the same time, unlike the centralized resistance energy consumption device based on IGBT or IGCT series valve, when it is put into operation, the resistor voltage is at the steady-state DC voltage U dc The energy consumption and power regulation characteristics of the integrated storage and consumption device based on the fully-controlled switching device frequently jump between 0 and 1.

[0048] The present application provides an integrated storage and consumption device based on a fully-controlled switch device, comprising an integrated storage and consumption module and a converter connected in parallel with the integrated storage and consumption module, the converter being connected to an AC system, the integrated storage and consumption module comprising N fully-controlled sub-modules connected in series, each fully-controlled sub-module comprising a first fully-controlled switch device, a first semiconductor device, a second fully-controlled switch device, a second semiconductor device, an energy storage element, a bypass switch and an energy consumption element, the second end of the first fully-controlled switch device being respectively connected to the first end of the energy storage element and the second end of the second fully-controlled switch device, the third end of the first fully-controlled switch device being connected to the first end of the bypass switch, the third end of the second fully-controlled switch device being connected to the first end of the energy consumption element, the second end of the energy consumption element being respectively connected to the second end of the bypass switch and the second end of the energy storage element, the first semiconductor device being connected in parallel to the second end and the third end of the first fully-controlled switch device, the second semiconductor device being connected in parallel to the second end and the third end of the second fully-controlled switch device; each fully-controlled sub-module operates independently. The integrated energy storage and consumption device based on fully-controlled switching devices can realize the operation in energy storage mode and energy consumption mode through N fully-controlled sub-modules connected in series in the integrated energy storage and consumption module, so that the integrated energy storage and consumption device based on fully-controlled switching devices has functions such as reactive power support, voltage stability, and energy balance; and solves the technical problem that existing high-power power electronic devices cannot realize multiple functions such as reactive power support, voltage stability, and energy balance at the same time.

[0049] It should be noted that the integrated storage and consumption device based on the fully controlled switching device has two functions of energy storage and energy consumption in addition to the existing functions of the converter itself through the integrated storage and consumption module. When the AC system 30 fails and causes the instantaneous power shortage in the AC system, the integrated storage and consumption device based on the fully controlled switching device enters the energy storage mode, and provides different power supports to the AC system 30 by adjusting the DC voltage reference value of the converter 20 according to the pre-set settings. When the AC system 30 fails and causes the AC system 30 to have a power surplus, the integrated storage and consumption device based on the fully controlled switching device enters the energy consumption mode, and according to the pre-set settings, different numbers of full-bridge sub-modules are put into use to dissipate different powers, thereby reducing the surplus power of the AC system 30. The integrated storage and consumption device based on the fully controlled switching device integrates multiple governance functions in the same device with the converter as the core, providing a new and effective technical means for the many challenges faced by the new power system, and has obvious advantages in terms of investment, land occupation and efficiency.

[0050] Embodiment 2:

[0051] Figure 2 This is a flowchart of the steps of a control method for an integrated storage and consumption device based on a fully-controlled switching device as described in an embodiment of the present application.

[0052] like Figure 2As shown, the embodiment of the present application provides a control method for a storage-consumption integrated device based on a fully-controlled switching device, which is applied to the above-mentioned storage-consumption integrated device based on a fully-controlled switching device. The control method includes the following steps:

[0053] S1. Obtain the power deficit and surplus power of the AC system when a fault occurs;

[0054] S2. If the power shortage is higher than the first power threshold, the storage and consumption module is controlled to operate in energy storage mode;

[0055] S3. If the surplus power is higher than the second power threshold value, the energy storage and consumption integrated module is controlled to operate in the energy consumption mode.

[0056] It should be noted that the content of the integrated storage and consumption device based on the fully-controlled switching device has been described in Example 1, and the content of the integrated storage and consumption device based on the fully-controlled switching device will not be described in detail in this embodiment. The control method of the integrated storage and consumption device based on the fully-controlled switching device is to determine whether the integrated storage and consumption module of the integrated storage and consumption device based on the fully-controlled switching device is to operate in an energy storage mode or an energy consumption mode according to the power deficit and surplus power of the AC system failure. In this embodiment, the first power threshold value and the second power threshold value can be set according to actual needs, and no specific limitation is made here.

[0057] In an embodiment of the present application, when the shortage power is higher than the first power threshold value, it indicates that a fault has occurred in the AC system resulting in an instantaneous power shortage in the AC system. In order to prevent the continuous drop in frequency from affecting the normal operation of the AC system, it is necessary to control the integrated storage and consumption module in the integrated storage and consumption device based on the fully-controlled switching device to operate in the energy storage mode.

[0058] Figure 3 This is a framework flow chart of the energy storage mode in the control method of the integrated storage and consumption device based on the fully controlled switching device described in the embodiment of the present application.

[0059] like Figure 3 As shown, in one embodiment of the present application, controlling the integrated storage and consumption module to operate in the energy storage mode includes:

[0060] Obtaining the slope coefficient of the converter voltage drop, the converter steady-state DC voltage and capacitance data of the energy storage element, and obtaining the fault time when the AC system fails;

[0061] The DC voltage reference value is obtained by calculating the missing power, fault time, steady-state DC voltage and capacitance data;

[0062] According to the DC voltage reference value and the slope coefficient, the DC voltage output by the converter is controlled to drop, and at the same time, all the first fully-controlled switching devices in the storage-consumption integrated module are controlled to be turned on, the second fully-controlled switching devices are controlled to be turned off, and the energy storage elements are controlled to discharge to the AC system to provide active power;

[0063] After the AC system is restored to stability, all first fully-controlled switch devices and second fully-controlled switch devices in the energy storage and consumption integrated module are controlled to be turned off, so that the energy storage and consumption integrated module exits the energy storage mode;

[0064] Among them, according to the missing power, fault time, steady-state DC voltage and capacitance data, the DC voltage reference value is calculated using the voltage reference value formula. The voltage reference value formula is: U dcref 2 =[0.5U dc 2 C*NP ref *t] / (0.5C*N), where t is the fault time in seconds; U dc is the steady-state DC voltage of the converter, C is the capacitance data of the energy storage element, N is the total number of fully controlled submodules in the energy storage and consumption integrated module, P ref The power shortage.

[0065] It should be noted that the slope coefficient can be set as required. In this embodiment, the control of the integrated storage and consumption module to operate in the energy storage mode is to control the DC voltage drop of the converter according to the slope coefficient based on the calculated DC voltage reference value, and turn on all the first fully controlled switch devices S1 and turn off all the second fully controlled switch devices S2 at the same time, and the energy storage element C provides active power to the outside through discharge. When the AC system 30 recovers stability, the integrated storage and consumption module 10 exits the energy storage mode by controlling the shutdown of all the first fully controlled switch devices S1 and the second fully controlled switch devices S2 in the integrated storage and consumption module 10.

[0066] In one embodiment of the present application, after the integrated storage and consumption module exits the energy storage mode, the control method of the integrated storage and consumption device based on the fully-controlled switching device includes: if the DC voltage output by the converter is restored to a steady-state DC voltage, all the first semiconductor devices in the integrated storage and consumption module are controlled to charge the corresponding energy storage elements so that the voltage of the energy storage elements is increased to a balance voltage.

[0067] The DC voltage of the converter gradually recovers to a steady-state DC voltage, and the energy storage element C is charged through the first semiconductor device D1, and the capacitor voltage of the energy storage element C increases to a balanced voltage. The balanced voltage is set according to the actual situation of the energy storage element C, and is not specifically limited here.

[0068] Figure 4It is a framework flow chart of the energy consumption mode in the control method of the integrated storage and consumption device based on the fully controlled switching device described in the embodiment of the present application.

[0069] like Figure 4 As shown, in one embodiment of the present application, controlling the integrated storage and consumption module to operate in the energy consumption mode includes:

[0070] Obtain the maximum transmission power of the integrated storage and consumption module; calculate the number of sub-modules to be put into use according to the total number of fully controlled sub-modules in the integrated storage and consumption module, surplus power and maximum transmission power;

[0071] Obtain the capacitor voltage of the energy storage element in each fully controlled submodule, and divide all fully controlled submodules in the storage-consumption integrated module into energy-consuming submodules and non-energy-consuming submodules according to the capacitor voltage from high to low and the number of submodules put into operation;

[0072] Controlling all first fully-controlled switch devices in the energy-consuming input submodule to be turned off and all second fully-controlled switch devices to be turned on, and controlling all first fully-controlled switch devices and second fully-controlled switch devices in the non-energy-consuming input submodule to be turned off;

[0073] After the AC system is restored to stability, all first fully-controlled switch devices and second fully-controlled switch devices in the energy storage and consumption integrated module are controlled to be turned off, so that the energy storage and consumption integrated module exits the operation of the energy consumption mode;

[0074] Among them, according to the total number of fully controlled submodules in the storage and consumption integrated module, the surplus power and the maximum transmission power are calculated using the module calculation formula to obtain the submodule data; the submodule data is processed using the further method to obtain the number of submodules put into use; the module calculation formula is N SM =(P surplus / P N )×N, where N SM is the submodule data, P surplus is the surplus power of the AC system when a fault occurs, P N is the maximum transmission power of the integrated storage and consumption module, and N is the total number of fully controlled submodules in the integrated storage and consumption module.

[0075] It should be noted that, when a fault occurs in the AC system 30 and a power surplus occurs in the AC system, the control method of the storage and consumption integrated device based on the fully controlled switch device controls the storage and consumption integrated module in the storage and consumption integrated device based on the fully controlled switch device to operate in the energy consumption mode in order to prevent energy accumulation from affecting the normal operation of the AC system 30. SM It should be no less than 1 and no greater than N. If the number of sub-modules is N tr , then the capacitor voltages in the storage and consumption integrated module 10 are screened from high to low according to N trThe full-control submodules constitute the energy-consuming input submodule, and the non-energy-consuming input submodule consists of the remaining (NN tr ) full control submodules. Among them, select N tr (1≤N tr ≤N) fully controlled submodules with capacitor voltages from high to low simultaneously turn on their corresponding second fully controlled switch devices S2 and first fully controlled switch devices S1, and the remaining (NN tr ) fully-controlled submodules turn on their corresponding first fully-controlled switch devices S1 and turn off their corresponding second fully-controlled switch devices S2 to achieve control of different dissipated powers and reduce the surplus power of the AC system 30. When the AC system 30 recovers stability, the second fully-controlled switch devices S2 and the first fully-controlled switch devices S1 of all fully-controlled submodules in the energy-storage-consumption integrated module 10 are controlled to be turned off simultaneously, and the energy-storage-consumption integrated module 10 exits the operation of the energy-storage-consumption mode.

[0076] In the embodiment of the present application, when the storage and consumption integrated module is running in the energy consumption mode, after determining the number of sub-modules, the energy consumption sub-modules and non-energy consumption sub-modules can be determined through the capacitor voltage balancing control link. tr The full-control submodules constitute the energy-consuming input submodule, and the non-energy-consuming input submodule consists of the remaining (NN tr ) full-control sub-modules.

[0077] In the embodiment of the present application, when the storage and consumption integrated device based on the fully controlled switch device is in normal standby, all fully controlled submodules should be in an inactive state, all first fully controlled switch devices S1 and all second fully controlled switch devices S2 are turned off, and the power of the energy consumption element R is 0 to prevent interference with the normal operation of the AC system 30. N fully controlled submodules are equivalent to N equivalent capacitors connected to the DC side of the AC system 30, and the voltage of each equivalent capacitor is U dc / N. When the integrated energy storage and consumption device based on the fully controlled switch device enters the energy consumption mode, N tr Each fully-controlled submodule will turn on its corresponding second fully-controlled switch device S2, turn on the second fully-controlled switch device S2 to discharge the energy storage element in the fully-controlled submodule corresponding to the fully-controlled submodule, and turn on the second fully-controlled switch device S2 to make the energy-consuming element in the fully-controlled submodule bear the corresponding capacitor voltage and consume active power. The first semiconductor device D1 in the fully-controlled submodule that does not turn on the second fully-controlled switch device S2 is in a charging state; in this case, the capacitor voltages of the energy storage elements in each fully-controlled submodule will no longer be equal, resulting in an unbalanced amount. Therefore, the capacitor voltage balancing control link is used to determine the fully-controlled submodule of the energy-consuming input submodule, and the content of the capacitor voltage balancing control link includes: first, the capacitor voltage U of the energy storage element in each fully-controlled submodule is regulated. CiSort them from high to low; then, when it is necessary to put the full-control submodule into energy consumption, select the full-control submodule with high capacitor voltage in order from high to low. Since the energy storage element of the full-control submodule is charged by the integrated storage and consumption device based on the full-control switch device when the full-control submodule is not put into energy consumption, the capacitor voltage of the energy storage element in the full-control submodule increases; during the period of putting the full-control submodule into energy consumption, the energy consumption element consumes the energy stored in the energy storage element, causing the capacitor voltage of the energy storage element to drop, so that the integrated storage and consumption device based on the full-control switch device can maintain the balance of the capacitor voltage of the energy storage element between different full-control submodules.

[0078] In an embodiment of the present application, when the integrated storage and consumption module operates in an energy consumption mode, a corresponding dissipated power reference value can be calculated based on the surplus power, and the dissipated power reference value can be limited to the rated power range of the DC energy consumption device through a limiting link.

[0079] It should be noted that the reference value of energy consumption power is equal to the surplus power P when the AC system fails. surplus ,The energy consumption power reference value is mainly used to determine whether the surplus power value exceeds the rated power of the energy consuming device.

[0080] Embodiment three:

[0081] Figure 5 A schematic diagram of a terminal device described in an embodiment of the present application.

[0082] like Figure 5 As shown, an embodiment of the present application provides a terminal device, including a processor and a memory;

[0083] A memory, used for storing program codes and transmitting the program codes to a processor;

[0084] The processor is used to execute the control method of the above-mentioned storage and consumption integrated device based on the fully controlled switching device according to the instructions in the program code.

[0085] It should be noted that the processor is used to execute the steps in the above-mentioned control method embodiment of a storage and consumption integrated device based on a fully controlled switching device according to the instructions in the program code. Alternatively, the processor implements the functions of each module / unit in the above-mentioned system / device embodiments when executing the computer program.

[0086] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of completing a specific function, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0087] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that this does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0088] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits, off-the-shelf programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0089] The memory may be an internal storage unit of the terminal device, such as a hard disk or memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card, a secure digital card, a flash memory card, etc. equipped on the terminal device. Furthermore, the memory may include both an internal storage unit of the terminal device and an external storage device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.

[0090] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0091] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0092] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0093] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0094] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

[0095] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for a storage-consumption integrated device based on a fully controlled switching device, characterized in that: Applied to a storage-consumption integrated device based on a fully controlled switching device, the control method comprises the following steps: Obtain the power deficit and surplus power when an AC system fails; If the power shortage is higher than the first power threshold value, the storage-consumption integrated module is controlled to operate in the energy storage mode; If the surplus power is higher than the second power threshold value, controlling the integrated storage and consumption module to operate in an energy consumption mode; The storage-consumption integrated device based on the fully-controlled switch device comprises a storage-consumption integrated module and a converter connected in parallel with the storage-consumption integrated module, the converter is connected to the AC system, the storage-consumption integrated module comprises N series-connected fully-controlled submodules, each of the fully-controlled submodules comprises a first fully-controlled switch device, a first semiconductor device, a second fully-controlled switch device, a second semiconductor device, an energy storage element, a bypass switch and an energy consumption element, the second end of the first fully-controlled switch device is respectively connected to the first end of the energy storage element and the second end of the second fully-controlled switch device, the first fully-controlled switch device is connected to the second end of the energy storage element, and the second end of the first fully-controlled switch device is connected to the second end of the energy storage element. The three terminals are connected to the first terminal of the bypass switch, the third terminal of the second fully-controlled switch device is connected to the first terminal of the energy-consuming element, the second terminal of the energy-consuming element is connected to the second terminal of the bypass switch and the second terminal of the energy storage element respectively, the first semiconductor device is connected in parallel to the second terminal and the third terminal of the first fully-controlled switch device, the second semiconductor device is connected in parallel to the second terminal and the third terminal of the second fully-controlled switch device, the first terminal of the first fully-controlled switch device and the first terminal of the second fully-controlled switch device are both connected to the control module; each of the fully-controlled sub-modules works independently; Controlling the integrated storage and consumption module to operate in energy storage mode includes: Obtaining the slope coefficient of the converter voltage drop, the converter steady-state DC voltage and capacitance data of the energy storage element, and obtaining the fault time when the AC system fails; Obtaining a DC voltage reference value by calculation according to the shortfall power, the fault time, the steady-state DC voltage and the capacitance data; Controlling the DC voltage output by the converter to drop according to the DC voltage reference value and the slope coefficient, and simultaneously controlling all first fully-controlled switch devices in the storage-consumption integrated module to turn on, second fully-controlled switch devices to turn off, and the energy storage element to discharge to the AC system, so as to provide active power; After the AC system recovers to be stable, all the first fully-controlled switching devices and the second fully-controlled switching devices in the integrated storage and consumption module are controlled to be turned off, so that the integrated storage and consumption module exits the energy storage mode.

2. The control method of the storage and consumption integrated device based on the fully controlled switch device according to claim 1, characterized in that: After the integrated storage and consumption module exits the energy storage mode, the control method includes: if the DC voltage output by the converter returns to a steady-state DC voltage, controlling all first semiconductor devices in the integrated storage and consumption module to charge the corresponding energy storage element so that the voltage of the energy storage element increases to a balanced voltage.

3. The control method of the storage and consumption integrated device based on the fully controlled switch device according to claim 1, characterized in that: include: According to the shortfall power, the fault time, the steady-state DC voltage and the capacitance data, a DC voltage reference value is calculated using a voltage reference value formula, and the voltage reference value formula is: dcref 2 =[0.5U dc 2 C*NP ref *t] / (0.5C*N), where t is the fault time in seconds; U dc is the steady-state DC voltage of the converter, C is the capacitance data of the energy storage element, N is the total number of fully controlled submodules in the energy storage and consumption integrated module, P ref The power shortage.

4. The control method of the storage and consumption integrated device based on the fully controlled switch device according to claim 1, characterized in that: Controlling the integrated storage and consumption module to operate in an energy consumption mode includes: Obtaining the maximum transmission power of the integrated storage and consumption module; calculating the number of submodules to be put into use according to the total number of full-control submodules in the integrated storage and consumption module, the surplus power and the maximum transmission power; Obtain the capacitor voltage of the energy storage element in each of the fully controlled submodules, and divide all the fully controlled submodules in the storage-consumption integrated module into energy-consuming submodules and non-energy-consuming submodules according to the capacitor voltage from high to low and the number of the input submodules; Controlling all first fully-controlled switch devices in the energy-consuming input submodule to be turned off and all second fully-controlled switch devices to be turned on, and controlling all first fully-controlled switch devices and second fully-controlled switch devices in the non-energy-consuming input submodule to be turned off; After the AC system recovers to be stable, all the first fully-controlled switching devices and the second fully-controlled switching devices in the integrated storage and consumption module are controlled to be turned off, so that the integrated storage and consumption module exits the energy consumption mode.

5. The control method of the storage and consumption integrated device based on the fully controlled switch device according to claim 4 is characterized in that: include: The submodule data is obtained by calculating the total number of all-control submodules in the storage-consumption integrated module, the surplus power and the maximum transmission power using a module calculation formula; Using a further method to process the submodule data to obtain the number of input submodules; The module calculation formula is N SM =(P surplus / P N )×N, where N SM is the submodule data, P surplus is the surplus power of the AC system when a fault occurs, P N is the maximum transmission power of the integrated storage and consumption module, and N is the total number of fully controlled submodules in the integrated storage and consumption module.

6. The control method of the storage and consumption integrated device based on the fully controlled switch device according to claim 1, characterized in that: include: The first fully-controlled switch device and the second fully-controlled switch device both include MOS tubes, IGBT tubes, GTO tubes or GTR tubes.

7. The control method of the storage and consumption integrated device based on the fully controlled switch device according to claim 1, characterized in that: The energy storage element is a supercapacitor, the energy consumption element is a resistor, and the first semiconductor device and the second semiconductor device are both diodes.

8. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the control method of the storage and consumption integrated device based on the fully controlled switching device as described in any one of claims 1 to 7 according to the instructions in the program code.

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