Method and device for starting static synchronous condenser and static synchronous condenser

Abstract

The present application provides a method and device for starting a static synchronous condenser, and a static synchronous condenser, and relates to the technical field of flexible power transmission in power systems. The method for starting a static synchronous condenser provided in the present application includes: based on the acquired starting instruction, controlling the connection of the starting circuit, allowing the power supply to charge the supercapacitor in the power unit, and starting the timing of a preset time period; when the timing of the preset time period ends and the first fault information is not received, based on the charging monitoring information, controlling the power supply to charge the supercapacitor in the power unit with resistance controllable charging, and calculating the first voltage of the supercapacitor; when the first voltage reaches the first preset voltage, based on the generated first discharge instruction, controlling the supercapacitor to discharge. The present application can improve the starting efficiency of the static synchronous condenser.

Description

Technical Field

[0001] The present application relates to the technical field of flexible power transmission in power systems, and in particular to a static synchronous phase condenser starting method and device, and a static synchronous phase condenser. Background Art

[0002] With the continuous development of new energy technology, the construction process of new power systems with new energy as the main body is accelerating. That is, the access scale of new energy with photovoltaic and wind power as the main body in the power system has been greatly increased, while the access ratio of fossil energy with traditional thermal power as the main body has continued to decline. In this case, when new energy is transmitted through ultra-high voltage AC and DC, after a fault occurs in the power grid system, there will be problems such as the interweaving of low voltage and overvoltage problems, and the deterioration of the impedance characteristics of the power grid system causing broadband oscillations, which limits the acceptance capacity of new energy. For this reason, a series of dynamic power loss compensation measures are proposed, such as the use of static reactive power compensation equipment such as SVG and SVC and the configuration of phase shifters.

[0003] Among them, the phase regulator includes the static synchronous phase regulator, which adopts the grid-type control technology. By improving the overcurrent capacity of the device and adopting the supercapacitor short-term energy storage technology, it has the same external characteristics as the traditional phase regulator and has strong flexibility. The supercapacitor is a short-term energy storage device and has the characteristics of wide voltage charging and discharging of capacitors. When the static synchronous phase regulator is started, the supercapacitor needs to be charged by the power converter.

[0004] However, the inventors of the present application have found that the traditional method of charging using a transition resistor is not suitable for supercapacitors; since the capacitance of supercapacitors is very large, the startup charging process takes a lot of time, reducing the efficiency of starting the phase regulator. Summary of the invention

[0005] In order to improve the starting efficiency of a static synchronous condenser, the present application provides a static synchronous condenser starting method, a static synchronous condenser starting device and a static synchronous condenser.

[0006] The present application provides a method for starting a static synchronous condenser, which adopts the following technical solution:

[0007] A method for starting a static synchronous condenser, the static synchronous condenser comprising a power supply, a starting circuit and a power unit, the method comprising:

[0008] Based on the acquired start-up instruction, the start-up circuit is controlled to be connected, so that the power supply charges the supercapacitor in the power unit and starts timing of a preset time period;

[0009] When the preset time period ends and the first fault information is not received, based on the generated charging monitoring information, the power supply is controlled to charge the supercapacitor in the power unit with resistance controllable charging, and a first voltage of the supercapacitor is calculated;

[0010] When the first voltage reaches the first preset voltage, the supercapacitor is controlled to discharge based on the generated first discharge instruction.

[0011] According to some embodiments, the above-mentioned preset time period includes a first preset time period and a second preset time period; based on the acquired startup instruction, the startup circuit is controlled to be connected so that the power supply charges the supercapacitor in the power unit, and the timing of the preset time period is started, including: based on the acquired startup instruction, the main switch in the startup circuit is controlled to be closed, so that the power supply charges the supercapacitor in the power unit with a small current without control, and the timing of the first preset time period is started; when the timing of the first preset time period ends and the second fault information is not received, based on the generated first bypass switch control instruction, the first bypass switch included in the startup loop in the startup circuit is controlled to be closed, so that the power supply charges the supercapacitor in the power unit with a large current without control, and the timing of the second preset time period is started.

[0012] According to some embodiments, after calculating the first voltage of the supercapacitor, the above-mentioned method further includes: generating a second bypass switch control instruction when the first voltage reaches a first preset voltage; based on the second bypass switch control instruction, controlling the second bypass switch included in the start-up loop in the start-up loop to close, so that the power supply charges the supercapacitor in the power unit with constant power, and calculating the second voltage of the supercapacitor, and when the second voltage reaches a second preset voltage, generating a second discharge instruction, and controlling the supercapacitor to discharge.

[0013] According to some embodiments, based on the generated charging monitoring information, the power supply is controlled to perform resistance-controlled charging for the supercapacitor in the power unit, including: calculating the impedance angle of the connected inductor and the starting circuit, the first output voltage of the power supply, and the second output voltage of the supercapacitor based on the charging monitoring information; calling a preset modulation rule to control the power unit to output a target voltage; wherein the target impedance angle of the target voltage is the same as the impedance angle, the target amplitude of the target voltage has a preset relationship with the first output voltage, and the target voltage does not exceed the second output voltage.

[0014] The present application provides a starting device for a static synchronous condenser, which adopts the following technical solution:

[0015] A starting device for a static synchronous condenser, the static synchronous condenser comprises a power supply, a starting circuit and a power unit, the starting device comprises: a first control module, a voltage calculation module and a second control module, wherein:

[0016] A first control module is used to control the startup circuit to be connected based on the acquired startup instruction, so that the power supply charges the supercapacitor in the power unit and starts timing of a preset time period;

[0017] A voltage calculation module, configured to control the power supply to charge the supercapacitor in the power unit with controllable resistance based on the generated charging monitoring information when the preset time period ends and the first fault information is not received, and calculate a first voltage of the supercapacitor;

[0018] The second control module is used to control the supercapacitor discharge operation based on the generated first discharge instruction when the first voltage reaches the first preset voltage.

[0019] According to some embodiments, the above-mentioned preset time period includes a first preset time period and a second preset time period; the above-mentioned first control module is specifically used to: based on the acquired startup instruction, control the main switch in the startup circuit to close, so that the power supply performs small current uncontrolled charging for the supercapacitor in the power unit, and starts the timing of the first preset time period; when the timing of the first preset time period ends and the second fault information is not received, based on the generated first bypass switch control instruction, control the first bypass switch included in the startup loop in the startup circuit to close, so that the power supply performs large current uncontrolled charging for the supercapacitor in the power unit, and starts the timing of the second preset time period.

[0020] According to some embodiments, the starting device of the static synchronous condenser further includes: an instruction generation module and a third control module, wherein the instruction generation module is used to generate a second bypass switch control instruction when the first voltage reaches a first preset voltage; the third control module is used to control the second bypass switch included in the starting loop in the starting circuit to close based on the second bypass switch control instruction, so that the power supply charges the supercapacitor in the power unit with constant power, calculates the second voltage of the supercapacitor, and generates a second discharge instruction when the second voltage reaches the second preset voltage, and controls the supercapacitor to discharge.

[0021] According to some embodiments, the above-mentioned voltage calculation module is specifically used to: calculate the impedance angle of the connected inductor and the starting circuit, the first output voltage of the power supply and the second output voltage of the supercapacitor based on the charging monitoring information; call the preset modulation rule to control the power unit to output the target voltage; wherein the target impedance angle of the target voltage is the same as the impedance angle, the target amplitude of the target voltage has a preset relationship with the first output voltage, and the target voltage does not exceed the second output voltage.

[0022] The present application provides a static synchronous condenser, which adopts the following technical solution:

[0023] A static synchronous condenser, capable of implementing the above-mentioned static synchronous condenser startup method, the static synchronous condenser comprises: a power supply, for providing a charging voltage;

[0024] A power unit, used for receiving a charging voltage provided by a power source;

[0025] The starting circuit is connected to the power supply and is used to respond to the starting instruction and connect to enable the power supply to charge the supercapacitor in the power unit.

[0026] According to some embodiments, the above-mentioned starting circuit includes: a main switch connected to the power supply and used to control the output of the charging voltage of the power supply; a starting loop connected to the main switch and the power unit and used to provide a band-blocking voltage.

[0027] According to some embodiments, the above-mentioned startup circuit includes at least one first bypass switch, at least one second bypass switch, at least one high-resistance resistor and at least one low-resistance resistor; at least one first bypass switch is connected in parallel with at least one high-resistance resistor; at least one second bypass switch is connected in parallel with at least one low-resistance resistor.

[0028] According to some embodiments, the static synchronous condenser further comprises: a connection reactor connected between the starting circuit and the power unit for limiting the short-circuit current.

[0029] According to some embodiments, the above-mentioned power unit is a plurality of power units, and the plurality of power units are connected in series, and each power unit includes: a third bypass switch, connected between the starting circuit and the power supply, and used to close in the event of a power unit failure to achieve power unit bypass; an AC / DC conversion unit, connected to the starting circuit, and used for AC / DC voltage conversion; and a supercapacitor, connected to the AC / DC conversion unit, and used to receive the voltage after the AC / DC voltage conversion.

[0030] According to the above-mentioned embodiment provided by the present application, when a start-up instruction is obtained, the start-up circuit is controlled to be connected, so that the power supply charges the supercapacitor in the power unit and starts timing the preset time period; when the preset time period timing ends and the first fault information is not received, the power supply is controlled to charge the supercapacitor in the power unit with controllable resistance through the charging monitoring information, and the first voltage information of the supercapacitor is calculated. When the first voltage information reaches the first preset voltage information, it indicates that the charging is completed at this time, and then based on the generation of the first discharge instruction, the supercapacitor is controlled to discharge, thereby ensuring the charging speed of the supercapacitor and improving the starting efficiency of the phase regulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a connection diagram of a static synchronous condenser according to an embodiment of the present application;

[0032] Figure 2 is a block diagram of a method for starting a static synchronous condenser according to an embodiment of the present application;

[0033] Figure 3 It is a block diagram of a starting device for a static synchronous condenser according to an embodiment of the present application.

[0034] Figure 4 It is a block diagram of an electronic device according to an embodiment of the present application.

[0035] Explanation of reference numerals: 301: first control module; 302: voltage calculation module; 303: file sending module; 40: electronic device; 401: processor; 402: bus; 403: memory; 404: transceiver. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-Figure 4 This application is described in further detail.

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the drawings in the embodiments of the present application are collected below to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Reference Figure 1 An embodiment of the present application provides a static synchronous phase condenser, including: a power supply for providing a charging voltage; a power unit for receiving the charging voltage provided by the power supply; a starting circuit connected to the power supply and used to respond to a starting instruction and connect so that the power supply charges a supercapacitor in the power unit; and a connecting inductor connected between the starting circuit and the power unit to limit short-circuit current.

[0039] The starting circuit includes: a main switch QF connected to the power supply and used to control the output of the charging voltage of the power supply; a starting loop connected to the main switch and the power unit and used to provide a resistance voltage.

[0040] In some embodiments, the main switch QF in the starting circuit is controlled by the main control platform; when the supercapacitor does not need to be charged, the main control platform does not generate a starting instruction, and at this time, the main switch QF is in a disconnected state; when the supercapacitor needs to be charged, the main control platform generates a starting instruction based on manual operation, and the main switch QF is closed in response to the starting instruction. At this time, the power supply and the starting circuit are turned on, and the voltage output by the power supply flows to the starting circuit and the connecting inductor to the power unit through the main switch QF in turn. The power unit converts the input voltage into AC / DC and inputs the converted voltage into the supercapacitor, thereby starting to charge the supercapacitor.

[0041] In some embodiments, reference Figure 1 The startup circuit may include at least one first bypass switch KM1, at least one second bypass switch KM2, at least one high-resistance resistor RH and at least one low-resistance resistor RL; at least one first bypass switch KM1 is connected in parallel with at least one high-resistance resistor RH; at least one second bypass switch KM2 is connected in parallel with at least one low-resistance resistor RL.

[0042] In some embodiments, the startup loop is intended to control the output power and output voltage of the power supply, that is, by controlling the opening and closing of the first bypass switch KM1 and the second bypass switch KM2 in the startup loop, the size of the resistor through which the output voltage of the power supply flows is controlled; because the output voltage of the power supply consumes a certain amount of power when flowing through the resistor, therefore, with the help of the high-resistance resistor RH and the low-resistance resistor RL in the startup loop, the output end of the startup loop can output a voltage of a specific power.

[0043] When the first bypass switch KM1 is closed and the second bypass switch KM2 is opened, the output voltage of the power supply only passes through the low-resistance resistor RL; when the first bypass switch KM1 is opened and the second bypass switch KM2 is opened, the output voltage of the power supply flows through the high-resistance resistor RH and the low-resistance resistor RL in sequence; when the first bypass switch KM1 is opened and the second bypass switch KM2 is closed, the output voltage of the power supply only flows through the high-resistance resistor RH; when the first bypass switch KM1 is opened and the second bypass switch KM2 is opened, the output voltage of the power supply directly flows through the loop in which the first bypass switch KM1 and the second bypass switch KM2 are turned on, and is output to the connected inductor, that is, it does not pass through the high-resistance resistor RH and the low-resistance resistor RL.

[0044] In some embodiments, reference Figure 1The power unit is a plurality of power units, and the plurality of power units are connected in series. Each power unit includes: a third bypass switch KM, connected between the starting circuit and the power supply, and used for closing in case of a power unit failure to realize power unit bypass; an AC / DC conversion unit (AC / DC unit), connected to the starting circuit, and used for AC / DC voltage conversion; a super capacitor, connected to the AC / DC conversion unit (AC / DC unit), and used for receiving the voltage after the AC / DC voltage conversion.

[0045] In some embodiments, multiple power units are connected in series, and each power unit is connected in parallel with a third bypass switch KM, so that when a power unit among the multiple power units fails and the static synchronous condenser cannot operate normally, the third bypass switch KM is controlled to close. At this time, the circuit of the third bypass switch KM forms a loop to bypass a power unit, that is, to remove the power unit from the static synchronous condenser to ensure that the static synchronous condenser can still operate normally.

[0046] The embodiment of the present application provides a programmable controller program processing method, which can be executed by an electronic device, wherein the electronic device can be a server or a terminal device, wherein the server can be an independent physical server, or a server cluster or distributed device composed of multiple physical servers, or a cloud server providing cloud computing services, and the electronic device is installed with programmable controller program development software. The terminal device can be a tablet computer, a laptop computer, a desktop computer, etc. including a main control platform, but is not limited thereto, and the terminal device and the server can be directly or indirectly connected via wired or wireless communication, and the embodiment of the present application is not limited here.

[0047] Reference Figure 2 A method for starting a static synchronous condenser is used to control the static synchronous condenser so that the supercapacitor in the static synchronous condenser is charged and started; the static synchronous condenser includes a power supply, a starting circuit and a power unit; the method includes: step S201, step S202 and step S203, wherein,

[0048] S201, based on the acquired start-up instruction, control the start-up circuit to be connected, so that the power supply charges the supercapacitor in the power unit, and starts timing of a preset time period.

[0049] In some embodiments, when the supercapacitor needs to be charged and started, the technician subjectively controls the electronic device to generate a start-up instruction, and sends the start-up instruction to the main switch in the start-up circuit to close the main switch. At this time, the power supply and the start-up circuit are connected, and the voltage output by the power supply flows to the power unit through the start-up circuit, thereby charging the supercapacitor in the power unit.

[0050] In addition, when the main switch is closed and the power supply is connected to the starting circuit, the preset time period set in advance by the electronic device starts timing. The preset time period is the duration of the first stage of uncontrolled charging provided by the power supply to the supercapacitor, and during the timing of the preset time period, the electronic device monitors the operating status of the static synchronous phase condenser in real time to determine whether there is a fault within the preset time period; in the event of a fault in the static synchronous phase condenser, the electronic device generates a termination instruction and sends the termination instruction to the main switch in the starting circuit, so that the main switch is disconnected, and then stops charging the supercapacitor.

[0051] S202, when the preset time period ends and the first fault information is not received, based on the generated charging monitoring information, the power supply is controlled to perform controllable resistance charging on the supercapacitor in the power unit, and a first voltage of the supercapacitor is calculated.

[0052] In some embodiments, when the preset time period ends, it indicates that the first stage of uncontrolled charging of the supercapacitor is completed; when the preset time period ends and the first fault information is not received, it indicates that the first stage of uncontrolled charging of the supercapacitor is completed, and the static synchronous phase regulator operates normally during the first stage of uncontrolled charging. At this time, the electronic device generates charging monitoring information and controls the power supply to charge the supercapacitor in the power supply unit with controllable resistance, that is, the impedance angle and amplitude of the AC / DC synchronous voltage source output by the power unit are controlled to ensure the optimal charging power, so that the power consumed by the resistor in the starting circuit is minimized and the charging power of the supercapacitor is maximized. At the same time, the electronic device calculates the first voltage of the supercapacitor in the current charging process in real time.

[0053] S203, when the first voltage reaches the first preset voltage, control the supercapacitor to discharge based on the generated first discharge instruction.

[0054] In some implementations, the electronic device presets a first voltage in advance. After the first stage charging and the second stage charging of the supercapacitor, when the first voltage of the supercapacitor calculated by the electronic device reaches the first preset voltage, it indicates that the supercapacitor is now fully charged and has the startup conditions. The electronic device then generates a first discharge instruction, and controls the supercapacitor discharge operation based on the first discharge instruction to complete the startup of the static synchronous phase condenser. Then, by adaptively controlling the supercapacitor charging process, it is ensured that the supercapacitor can be quickly charged during the charging process at different stages, thereby improving the startup efficiency of the static synchronous phase condenser.

[0055] In addition, the traditional static synchronous condenser startup process, that is, the use of uncontrolled charging, the current is intermittent during the charging process, and the large harmonics cause serious pollution to the system. Compared with the traditional static synchronous condenser startup method, the present application adopts a controlled charging method during the charging process. The current on the AC side is a complete sine wave, and the amount of harmonics generated is very small, which can avoid current discontinuity and reduce the impact of large harmonics on the static synchronous condenser. Pollution; and, when the charge amount of the supercapacitor reaches a small value, the present application can unlock and start the balancing strategy of each level of the static synchronous condenser module, which can keep the voltage of the supercapacitor balanced during the entire startup process, so that the static synchronous condenser remains in the optimal state.

[0056] In some embodiments, the preset time period includes a first preset time period and a second preset time period; in step S201, based on the acquired startup instruction, the startup circuit is controlled to be connected so that the power supply charges the supercapacitor in the power unit, and the timing of the preset time period is started, including: based on the acquired startup instruction, the main switch in the startup circuit is controlled to be closed, so that the power supply charges the supercapacitor in the power unit with a small current without control, and the timing of the first preset time period is started; when the timing of the first preset time period ends and the second fault information is not received, based on the generated first bypass switch control instruction, the first bypass switch included in the startup loop in the startup circuit is controlled to be closed, so that the power supply charges the supercapacitor in the power unit with a large current without control, and the timing of the second preset time period is started.

[0057] In some embodiments, the electronic device generates a startup instruction and sends the startup instruction to a main switch in the startup circuit to close the main switch. At this time, the power supply is connected to the startup circuit, and the output voltage of the power supply enters the startup circuit and flows to the supercapacitor in the power unit to charge the supercapacitor, and the timing of the first preset time period begins. During the timing of the first preset time period, the electronic device monitors the operation of the static synchronous condenser in real time and determines whether there is a fault within the first preset time period. When the timing of the first preset time period ends and no second fault information is received, it indicates that the first stage of small current uncontrolled charging of the supercapacitor is completed at this time. Subsequently, the electronic device generates a first bypass switch control instruction, and based on the first bypass switch control instruction, controls the first bypass switch included in the startup loop in the startup circuit to close, so as to realize the high-resistance resistor bypass connected in parallel with the first bypass switch, that is, the first stage of large current uncontrolled charging of the supercapacitor begins. In addition, during the first stage of large current uncontrolled charging of the supercapacitor, the electronic device starts timing the second preset time period preset in advance, and during the timing of the second preset time period, monitors the operation of the static synchronous condenser in real time.

[0058] In step S202, after calculating the first voltage of the supercapacitor, it also includes: when the first voltage reaches the first preset voltage, generating a second bypass switch control instruction; based on the second bypass switch control instruction, controlling the second bypass switch included in the start-up loop in the start-up loop to close, so that the power supply charges the supercapacitor in the power unit with constant power, and calculating the second voltage of the supercapacitor, and when the second voltage reaches the second preset voltage, generating a second discharge instruction, and controlling the supercapacitor to discharge.

[0059] In some embodiments, when the first voltage reaches the first preset voltage, it indicates that the second stage of resistance-controlled charging of the supercapacitor is completed, and the first voltage at this time reaches a state that can control the supercapacitor to discharge. However, the first voltage does not mean that the storage capacity of the supercapacitor is full, and it is also possible to consider continuing to charge the supercapacitor at this time; during the charging process, considering that a certain amount of power is consumed when the voltage flows through the high-resistance resistor and the low-resistance resistor in the starting circuit, therefore, when the second stage of resistance-controlled charging of the supercapacitor is completed, when the supercapacitor continues to be charged subsequently, large-current constant-power charging can be considered, that is, the current does not flow through the high-resistance resistor and the low-resistance resistor in the starting circuit, and the power supply directly charges the supercapacitor in the power unit.

[0060] Therefore, the electronic device can generate a second bypass switch control instruction when the first voltage reaches the first preset voltage, and send the second bypass switch control instruction to the second bypass switch included in the start-up loop in the start-up circuit, so that the second bypass switch is closed, and the high-resistance resistor and the low-resistance resistor in the start-up loop form a bypass, and the power supply directly charges the supercapacitor in the power unit; thereafter, when the calculated second voltage of the supercapacitor reaches the second preset voltage, it indicates that the overall charging process of the supercapacitor has been completed and can have a discharge function. At this time, the electronic device generates a second discharge instruction and controls the discharge operation of the supercapacitor based on the second discharge quality.

[0061] In step S202, based on the generated charging monitoring information, the power supply is controlled to perform resistance-controlled charging for the supercapacitor in the power unit, including: calculating the impedance angle of the connected inductor and the starting circuit, the first output voltage of the power supply, and the second output voltage of the supercapacitor based on the charging monitoring information; calling a preset modulation rule to control the power unit to output a target voltage; wherein the target impedance angle of the target voltage is the same as the impedance angle, the target amplitude of the target voltage has a preset relationship with the first output voltage, and the target voltage does not exceed the second output voltage.

[0062] In some embodiments, the target voltage is a three-phase AC voltage, and the preset modulation rule can be a PWM (pulse width modulation) or a NLM (nearest level approach modulation) modulation rule. The electronic device first calculates the impedance angle of the connection reactor and the start-up circuit, the first output voltage of the power supply, and the second output voltage of the supercapacitor based on the charging monitoring information, and uses the above impedance angle, the first output voltage, and the second output voltage as reference parameters. Based on the preset modulation rule, the power unit is controlled to output the target voltage, and the target impedance angle of the target voltage is the same as the impedance angle, the target amplitude of the target voltage is equal to the first output voltage of the preset multiple, and the target voltage does not exceed the second output voltage. For example, the first output voltage is Us, the second output voltage is Ucm, and the target amplitude of the target voltage output by the power unit is kUs, where k can be 0.5≤k≤1.0.

[0063] In some embodiments, the output target voltage is output as follows:

[0064]

[0065] Among them, U M =max(kUs,U CM ), k can be in the range of 0.5≤k≤1.0, U refa is the target voltage of phase A, u refb is the target voltage of phase B, U refc is the C-phase voltage of the target voltage, and θ is the impedance angle.

[0066] The present application provides a starting device for a static synchronous condenser, which adopts the following technical solution:

[0067] Reference Figure 3 A starting device 30 of a static synchronous condenser, the static synchronous condenser comprises a power supply, a starting circuit and a power unit, the starting device comprises: a first control module, a voltage calculation module and a second control module, wherein:

[0068] The first control module 301 is used to control the startup circuit to be connected based on the acquired startup instruction, so that the power supply charges the supercapacitor in the power unit and starts timing of a preset time period;

[0069] The voltage calculation module 302 is used to control the power supply to charge the supercapacitor in the power unit with resistance controllable charging and calculate the first voltage of the supercapacitor based on the generated charging monitoring information when the preset time period ends and the first fault information is not received;

[0070] The second control module 303 is configured to control the supercapacitor to discharge based on the generated first discharge instruction when the first voltage reaches the first preset voltage.

[0071] According to some embodiments, the above-mentioned preset time period includes a first preset time period and a second preset time period; the above-mentioned first control module 301 is specifically used to: based on the acquired startup instruction, control the main switch in the startup circuit to close, so that the power supply performs small current uncontrolled charging for the supercapacitor in the power unit, and starts the timing of the first preset time period; when the timing of the first preset time period ends and the second fault information is not received, based on the generated first bypass switch control instruction, control the first bypass switch included in the startup loop in the startup circuit to close, so that the power supply performs large current uncontrolled charging for the supercapacitor in the power unit, and starts the timing of the second preset time period.

[0072] According to some embodiments, the starting device 30 of the static synchronous condenser further includes: an instruction generation module and a third control module, wherein the instruction generation module is used to generate a second bypass switch control instruction when the first voltage reaches a first preset voltage; the third control module is used to control the second bypass switch included in the starting loop in the starting loop to close based on the second bypass switch control instruction, so that the power supply charges the supercapacitor in the power unit with constant power, calculates the second voltage of the supercapacitor, and generates a second discharge instruction when the second voltage reaches a second preset voltage, and controls the supercapacitor to discharge.

[0073] According to some embodiments, the voltage calculation module 302 is specifically used to: calculate the impedance angle of the connected reactor and the starting circuit, the first output voltage of the power supply, and the second output voltage of the supercapacitor based on the charging monitoring information; call the preset modulation rule to control the power unit to output the target voltage; wherein the target impedance angle of the target voltage is the same as the impedance angle, the target amplitude of the target voltage has a preset relationship with the first output voltage, and the target voltage does not exceed the second output voltage.

[0074] In some embodiments, the first control module 301 may include a logic circuit, or may be implemented by a central processing unit, a digital signal processor, or a field programmable gate array, etc. included in the electronic device; the voltage calculation module 302 may include a logic circuit, or may be implemented by a central processing unit, a digital signal processor, or a field programmable gate array, etc. included in the electronic device; the second control module 303 may include a logic circuit, or may be implemented by a central processing unit, a digital signal processor, or a field programmable gate array, etc. included in the electronic device; the instruction generation module may include a logic circuit, or may be implemented by a central processing unit, a digital signal processor, or a field programmable gate array, etc. included in the electronic device; the third control module may include a logic circuit, or may be implemented by a central processing unit, a digital signal processor, or a field programmable gate array, etc. included in the electronic device.

[0075] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0076] The embodiment of the present invention also introduces an electronic device from the perspective of a physical device, such as Figure 4 As shown, Figure 4 The electronic device 40 shown includes: a processor 401 and a memory 403. The processor 401 and the memory 403 are connected, such as through a bus 402. Optionally, the electronic device 40 may also include a transceiver 404. It should be noted that in actual applications, the transceiver 404 is not limited to one, and the structure of the electronic device 40 does not constitute a limitation on the embodiments of the present invention.

[0077] Processor 401 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in the disclosure of the present invention. Processor 401 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0078] The bus 402 may include a path to transmit information between the above components. The bus 402 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 402 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0079] The memory 403 can be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other storage medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited to these.

[0080] The memory 403 is used to store application code for executing the solution of the present invention, and the execution is controlled by the processor 401. The processor 401 is used to execute the application code stored in the memory 403 to implement the content shown in the above method embodiment.

[0081] Figure 4 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0082] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0083] The above are only some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for starting a static synchronous condenser, characterized in that: The static synchronous condenser comprises a power supply, a starting circuit and a power unit, and the method comprises: Based on the acquired start-up instruction, control the start-up circuit to be connected, so that the power supply charges the supercapacitor in the power unit, and starts timing of a preset time period; When the preset time period ends and the first fault information is not received, based on the generated charging monitoring information, the power supply is controlled to charge the supercapacitor in the power unit with resistance control, and a first voltage of the supercapacitor is calculated; When the first voltage reaches a first preset voltage, based on the generated first discharge instruction, controlling the supercapacitor to discharge; Wherein, after calculating the first voltage of the supercapacitor, the method further includes: When the first voltage reaches the first preset voltage, generating a second bypass switch control instruction; Based on the second bypass switch control instruction, the second bypass switch included in the startup loop in the startup circuit is controlled to close, so that the power supply charges the supercapacitor in the power unit with constant power, and calculates the second voltage of the supercapacitor. When the second voltage reaches a second preset voltage, a second discharge instruction is generated, and the supercapacitor is controlled to discharge.

2. The method according to claim 1, characterized in that The preset time period includes a first preset time period and a second preset time period; The controlling the startup circuit to be connected based on the acquired startup instruction, so that the power supply charges the supercapacitor in the power unit, and starts timing of a preset time period, includes: Based on the acquired start-up instruction, controlling the main switch in the start-up circuit to close, so that the power supply performs small current uncontrolled charging for the supercapacitor in the power unit, and starting the timing of the first preset time period; When the first preset time period ends and no second fault information is received, based on the generated first bypass switch control instruction, the first bypass switch included in the start-up circuit in the start-up circuit is controlled to close, so that the power supply performs large-current uncontrolled charging for the supercapacitor in the power unit, and starts timing the second preset time period.

3. The method according to any one of claims 1 or 2, characterized in that: The method of controlling the power supply to charge the supercapacitor in the power unit with controllable resistance based on the generated charging monitoring information includes: Based on the charging monitoring information, calculating the impedance angle connecting the reactor and the starting circuit, the first output voltage of the power supply, and the second output voltage of the supercapacitor; Calling a preset modulation rule to control the power unit to output a target voltage; wherein, the target impedance angle of the target voltage is the same as the impedance angle, there is a preset relationship between the target amplitude of the target voltage and the first output voltage, and the target voltage does not exceed the second output voltage.

4. A starting device for a static synchronous condenser, characterized in that: The static synchronous condenser comprises a power supply, a starting circuit and a power unit, and the starting device comprises: A first control module, configured to control the startup circuit to be connected based on the acquired startup instruction, so that the power supply charges the supercapacitor in the power unit, and starts timing of a preset time period; a voltage calculation module, configured to control the power supply to charge the supercapacitor in the power unit with resistance controllable charging and calculate a first voltage of the supercapacitor based on the generated charging monitoring information when the preset time period ends and the first fault information is not received; A second control module, configured to control the supercapacitor to discharge based on a generated first discharge instruction when the first voltage reaches a first preset voltage; An execution generation module, configured to generate a second bypass switch control instruction when the first voltage reaches the first preset voltage; The third control module is used to control the closure of the second bypass switch included in the start-up circuit in the start-up circuit based on the second bypass switch control instruction, so that the power supply charges the supercapacitor in the power unit with constant power, calculates the second voltage of the supercapacitor, and generates a second discharge instruction when the second voltage reaches a second preset voltage, and controls the discharge operation of the supercapacitor.

5. A static synchronous condenser, characterized in that: The method according to any one of claims 1 to 3 can be implemented, wherein the static synchronous condenser comprises: A power supply for providing a charging voltage; The power unit is used to receive the charging voltage provided by the power source. A starting circuit is connected to the power supply and is used to respond to the starting instruction and connect to enable the power supply to charge the supercapacitor in the power unit.

6. The static synchronous condenser according to claim 5, characterized in that: The startup circuit comprises: A main switch, connected to the power supply, and used to control the output of the charging voltage of the power supply; A start-up circuit is connected to the main switch and the power unit and is used to provide a band-resistance voltage.

7. The static synchronous condenser according to claim 6, characterized in that: The startup loop includes at least one first bypass switch, at least one second bypass switch, at least one high-resistance resistor and at least one low-resistance resistor; The at least one first bypass switch is connected in parallel with the at least one high-resistance resistor; The at least one second bypass switch is connected in parallel with the at least one low-resistance resistor.

8. The static synchronous condenser according to claim 5, characterized in that: Also includes: A connecting reactor is connected between the starting circuit and the power unit to limit the short-circuit current.

9. The static synchronous condenser according to any one of claims 5 to 8, characterized in that: The power unit is a plurality of power units, the plurality of power units are connected in series, and each of the power units comprises: A third bypass switch, connected between the start-up circuit and the power supply, and configured to close in the event of a failure of the power unit to bypass the power unit; An AC / DC conversion unit, connected to the start-up circuit, for AC / DC voltage conversion; The super capacitor is connected to the AC / DC conversion unit and is used to receive the voltage after the AC / DC voltage is converted.

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