Gas turbine black-start system and method based on high-voltage direct-hanging energy storage converter

Abstract

The invention relates to the technical field of power electronic application, and discloses a gas turbine black start system and method based on a high-voltage direct-hanging energy storage converter, and the system comprises the high-voltage direct-hanging energy storage converter, a static start frequency converter, an excitation system, a diesel generator, a gas turbine, a bus, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, an output reactor L1 and a grid-connected reactor L2, the high-voltage direct-hanging energy storage converter is composed of a high-voltage direct-hanging energy storage converter control system, a plurality of energy storage power units and a grid-connected reactor L2, and the static starting frequency converter is composed of a split transformer, a rectification loop, a direct-current loop, an inversion loop, an output reactor L1 and a static starting frequency converter control system. According to the invention, the problem of starting failure caused by unstable power supply of the static starting frequency converter is solved, and the influence of power side harmonic waves, voltage sag, power fluctuation and the like of the static starting frequency converter on the starting process in the black-start process of the gas turbine is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics applications, and in particular to a combustion engine black start system and method based on a high-voltage direct-mounted energy storage converter. Background Art

[0002] Generally speaking, the start-up of a gas turbine requires a stable power supply from the grid, but the black start mode of a gas turbine plays an important role in accelerating the recovery of the power system and reducing the impact in the event of a major power outage or when the grid is unable to supply power.

[0003] The traditional black start scheme of gas turbine mainly uses diesel generator to power the static start inverter to drive the gas turbine. The wear, damage or aging of the internal parts of the diesel generator, such as the flywheel, camshaft and connecting rod, circuit aging, capacitor aging and other problems will cause the output power of the diesel generator to be unstable or interrupted. In addition, problems such as excessive impurities in the fuel, unstable oil quality, and insufficient oil pump pressure will affect the combustion efficiency of the diesel generator, resulting in unstable active power, a decrease in the output power of the diesel generator or intermittent output. Furthermore, the capacity of the diesel generator is small, and the harmonics on the input side of the static start inverter affect the stability of the output voltage of the diesel generator.

[0004] When a diesel generator is used to assist the black start of the gas turbine, the unstable output of the diesel generator can easily cause large fluctuations in the output of the static start inverter or cause a static start inverter failure, thereby causing the gas turbine to fail to start.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes a gas turbine black start system and method based on a high-voltage direct-mounted energy storage converter to overcome the above-mentioned technical problems existing in the existing related art.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] According to one aspect of the present invention, a gas turbine black start system based on a high-voltage direct-mounted energy storage converter is provided, comprising a high-voltage direct-mounted energy storage converter, a static starting frequency converter, an excitation system, a diesel generator, a gas turbine, a busbar, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, an output reactor L1 and a grid-connected reactor L2;

[0009] The busbar is connected to the power grid and the diesel generator output through the circuit breaker QF1 and the circuit breaker QF2 respectively, the gas turbine is connected to the busbar through the circuit breaker QF5, the static start frequency converter and the circuit breaker QF4 in sequence, the high-voltage direct-mounted energy storage converter is connected to the busbar through the circuit breaker QF3, the excitation system receives the excitation instruction of the static start frequency converter control system, and the output end of the excitation system is connected to the gas turbine;

[0010] The high-voltage direct-mounted energy storage converter is composed of a high-voltage direct-mounted energy storage converter control system, a plurality of energy storage power units and a grid-connected reactor L2, and the high-voltage direct-mounted energy storage converter control system is communicatively connected with each energy storage power unit for collecting state information, fault information, mode information and instruction information for interaction, the energy storage power unit is used to store / release electric energy, and the three-phase output of the high-voltage direct-mounted energy storage converter is connected to the power grid through the grid-connected reactor L2;

[0011] The static starting inverter is composed of a split transformer T, a rectifier circuit, a DC circuit, an inverter circuit, an output inductor L1 and a static starting inverter control system. The output end of the split transformer T is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the inverter circuit through the DC circuit, and the output end of the inverter circuit is connected to the output inductor L1.

[0012] Preferably, the AC ports of several energy storage power units are connected in series, the first-stage AC ports not connected to other energy storage power units are connected to each other to form a neutral point, and the N-stage AC ports not connected to other energy storage power units form a three-phase AC interface;

[0013] The DC side of the energy storage power unit is connected to a battery or other energy storage element. The high-voltage direct-mounted energy storage inverter control system controls the energy storage power unit through optical fiber communication, converts the DC power stored in the battery into AC power, and realizes a two-way flow of electric energy.

[0014] Preferably, the energy storage power unit transmits unit information to the high-voltage direct-mounted energy storage converter control system, so as to realize real-time monitoring and protection of the energy storage power unit by the high-voltage direct-mounted energy storage converter control system.

[0015] Preferably, the rectifier circuit includes AC-DC converters AC / DC1 and AC / DC2, the DC circuit includes a reactor L3, and the inverter circuit includes a DC-AC converter DC / AC;

[0016] The split transformer T is respectively connected to the AC sides of the AC-DC converter AC / DC1 and the AC-DC converter AC / DC2, and the DC sides of the AC-DC converter AC / DC1 and the AC-DC converter AC / DC2 are connected in series and connected to the DC-AC converter DC / AC through the reactor L3.

[0017] Preferably, it also includes a gas turbine control system, and the gas turbine control system sends voltage and current instructions to the high-voltage direct-mounted energy storage converter control system of the high-voltage direct-mounted energy storage converter and the static starting inverter control system of the static starting inverter.

[0018] Preferably, when the circuit breakers QF1 and QF3 are closed, and the circuit breakers QF2 and QF4 are opened, the high-voltage direct-mounted energy storage converter is connected to the power grid to charge the battery in the energy storage power unit, thereby ensuring that the charge state of the battery in the energy storage power unit is normal before the black start;

[0019] When the circuit breakers QF2 and QF3 are closed, and the circuit breakers QF1 and QF4 are opened, the high-voltage direct-mounted energy storage converter is connected to the diesel generator to charge the battery in the energy storage power unit, thereby ensuring that the charge state of the battery in the energy storage power unit is normal before the black start;

[0020] When the circuit breakers QF2, QF3, QF4 and QF5 are closed, and the circuit breaker QF1 is opened, the diesel generator, the high-voltage direct-mounted energy storage inverter and the input side of the static starting inverter are connected to realize the black start of the gas turbine based on the high-voltage direct-mounted energy storage inverter.

[0021] Preferably, the three-phase voltage signal and current signal on the output side of the high-voltage direct-mounted energy storage inverter and the input side current signal of the static starting inverter are connected to the sampling interface of the high-voltage direct-mounted energy storage inverter through sensors.

[0022] According to another aspect of the present invention, a method for black starting a gas turbine based on a high-voltage direct-mounted energy storage converter is provided. The method for black starting a gas turbine based on a high-voltage direct-mounted energy storage converter comprises the following steps:

[0023] S1, when circuit breakers QF2, QF3, QF4 and QF5 are closed, start the diesel generator to the power frequency, so that the high-voltage direct-mounted energy storage converter completes pre-charging and is in hot standby state;

[0024] S2, start the high-voltage direct-mounted energy storage converter and the static starting inverter, and use the static starting inverter to drive the gas turbine to start; use the high-voltage direct-mounted energy storage converter to detect the three-phase voltage and current on the output side in real time, and detect the input side current of the static starting inverter at the same time;

[0025] S3, obtain the voltage angle through the phase-locked loop module, calculate the active component of the voltage on the input side of the high-voltage direct-mounted energy storage converter and the active component of the current on the input side of the high-voltage direct-mounted energy storage converter according to the voltage and current on the input side of the high-voltage direct-mounted energy storage converter, and calculate the active component and reactive component of the current on the input side of the static starting inverter according to the input side current of the static starting inverter;

[0026] S4. Calculate the active current compensation instruction and reactive current compensation instruction of the high-voltage direct-mounted energy storage converter based on the voltage and current instruction of the gas turbine control system; calculate the three-phase output voltage instruction of the high-voltage direct-mounted energy storage converter based on the coordinate transformation;

[0027] S5. The high-voltage direct-mounted energy storage converter sends the calculation results to the energy storage power unit, and each level of energy storage power unit outputs pulses to achieve reactive and active power compensation on the input side of the static starting inverter.

[0028] Preferably, the high-voltage direct-mounted energy storage inverter has the capability of providing reactive and active power support for a short period of time and a redundant design function. When a preset number of energy storage power units fail, the faulty energy storage power units can be bypassed to continue to complete the reactive and active power compensation function on the input side of the static starting inverter.

[0029] The beneficial effects of the present invention are as follows: the gas turbine black start system and method based on the high-voltage direct-mounted energy storage inverter proposed in the present invention solves the problem of start failure caused by unstable power supply of the static start inverter, and effectively reduces the influence of harmonics, voltage sag, power fluctuation and other problems on the power supply side of the static start inverter during the gas turbine black start process. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1 This is a structural block diagram of a gas turbine black start system based on a high-voltage direct-mounted energy storage converter according to an embodiment of the present invention;

[0032] Figure 2The present invention is a flowchart of a method for black starting a gas turbine based on a high-voltage direct-mounted energy storage converter according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0034] According to an embodiment of the present invention, a gas turbine black start system and method based on a high-voltage direct-mounted energy storage converter are provided.

[0035] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1 As shown, according to one embodiment of the present invention, a gas turbine black start system based on a high-voltage direct-mounted energy storage converter is provided, including a high-voltage direct-mounted energy storage converter, a static starting frequency converter, an excitation system, a diesel generator, a gas turbine, a busbar, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, an output reactor L1 and a grid-connected reactor L2;

[0036] The busbar is connected to the power grid and the diesel generator output through the circuit breaker QF1 and the circuit breaker QF2 respectively, the gas turbine is connected to the busbar through the circuit breaker QF5, the static start frequency converter and the circuit breaker QF4 in sequence, the high-voltage direct-mounted energy storage converter is connected to the busbar through the circuit breaker QF3, the excitation system receives the excitation instruction of the static start frequency converter control system, and the output end of the excitation system is connected to the gas turbine;

[0037] The high-voltage direct-mounted energy storage converter is composed of a high-voltage direct-mounted energy storage converter control system, 3*N energy storage power units and a grid-connected reactor L2, and the high-voltage direct-mounted energy storage converter control system is communicatively connected with each energy storage power unit for collecting information such as status information, fault information, mode information and instructions, and the energy storage power unit is used to store / release electric energy, and the three-phase output of the high-voltage direct-mounted energy storage converter is connected to the power grid through the grid-connected reactor L2;

[0038] The AC ports of the energy storage power units are connected in series, the first-stage AC ports not connected to other energy storage power units are connected to each other to form a neutral point, and the N-stage AC ports not connected to other energy storage power units form a three-phase AC interface;

[0039] The DC side of the energy storage power unit is connected to a battery or other energy storage element, and the high-voltage direct-mounted energy storage converter control system controls the energy storage power unit through optical fiber communication, converts the DC power stored in the battery into AC power, and realizes the two-way flow of electric energy. The energy storage power unit transmits the unit information to the high-voltage direct-mounted energy storage converter control system, so that the high-voltage direct-mounted energy storage converter control system can monitor and protect the energy storage power unit in real time.

[0040] The static starting inverter is composed of a split transformer T, a rectifier circuit, a DC circuit, an inverter circuit, an output inductor L1 and a static starting inverter control system. The output end of the split transformer T is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the inverter circuit through the DC circuit, and the output end of the inverter circuit is connected to the output inductor L1.

[0041] Specifically, the rectifier circuit includes AC-DC converters AC / DC1 and AC / DC2, the DC circuit includes a reactor L3, and the inverter circuit includes a DC-AC converter DC / AC; wherein the split transformer T is respectively connected to the AC sides of the AC-DC converter AC / DC1 and the AC-DC converter AC / DC2, and the DC sides of the AC-DC converter AC / DC1 and the AC-DC converter AC / DC2 are connected in series and connected to the DC-AC converter DC / AC through the reactor L3.

[0042] In addition, in this embodiment, a TCS engine control system is also included, and the TCS engine control system converts the voltage command Current command The control system of the high-voltage direct-mounted energy storage converter and the static-start converter control system of the static-start converter are sent to the high-voltage direct-mounted energy storage converter.

[0043] In this embodiment, when the circuit breakers QF1 and QF3 are closed, and the circuit breakers QF2 and QF4 are opened, the high-voltage direct-mounted energy storage converter can be connected to the power grid to realize charging of the battery in the energy storage power unit, thereby ensuring that the charge state of the battery in the energy storage power unit is normal before the black start;

[0044] When the circuit breakers QF2 and QF3 are closed, and the circuit breakers QF1 and QF4 are opened, the high-voltage direct-mounted energy storage converter can be connected to the diesel generator to charge the battery in the energy storage power unit, thereby ensuring that the charge state of the battery in the energy storage power unit is normal before the black start;

[0045] When the circuit breakers QF2, QF3, QF4 and QF5 are closed, and the circuit breaker QF1 is opened, the input sides of the diesel generator, the high-voltage direct-mounted energy storage inverter and the static starting inverter are connected together, and the black start of the gas turbine based on the high-voltage direct-mounted energy storage inverter is achieved through the black start method of the gas turbine based on the high-voltage direct-mounted energy storage inverter.

[0046] In this embodiment, the three-phase voltage signal U at the output side of the high-voltage direct-mounted energy storage converter PCS_abc , current signal I PCS_abc and the input side current signal I of the static starting inverter SFC_abc They are all connected to the sampling interface of the high-voltage direct-mounted energy storage converter through sensors.

[0047] According to another aspect of the present invention, Figure 2 As shown, a method for black starting a gas turbine based on a high-voltage direct-mounted energy storage converter is provided, and the method for black starting a gas turbine based on a high-voltage direct-mounted energy storage converter comprises the following steps:

[0048] S1, when circuit breakers QF2, QF3, QF4 and QF5 are closed, start the diesel generator to the power frequency, so that the high-voltage direct-mounted energy storage converter completes pre-charging and is in hot standby state;

[0049] S2, start the high-voltage direct-mounted energy storage converter and the static starting inverter, and use the static starting inverter to drag the gas turbine to start (that is, the static starting inverter drags the gas turbine to start from the gas turbine cranking speed); use the high-voltage direct-mounted energy storage converter to detect the three-phase voltage and current on the output side in real time, and detect the input side current of the static starting inverter at the same time;

[0050] S3, obtain the voltage angle through the phase-locked loop module, calculate the active component of the voltage on the input side of the high-voltage direct-mounted energy storage converter and the active component of the current on the input side of the high-voltage direct-mounted energy storage converter according to the voltage and current on the input side of the high-voltage direct-mounted energy storage converter, and calculate the active component and reactive component of the current on the input side of the static starting inverter according to the input side current of the static starting inverter;

[0051] Among them, the calculation formula for the active component of the input side voltage of the high-voltage direct-mounted energy storage converter is:

[0052]

[0053] The calculation formula for the active component of the input current of the high-voltage direct-mounted energy storage converter is:

[0054]

[0055] The calculation formula for the active component and reactive component of the input current of the static starting inverter is:

[0056]

[0057] Where U PCS_d Indicates the active component of the input voltage of the high-voltage direct-mounted energy storage converter; U PCS_q represents the reactive component of the input voltage of the high-voltage direct-mounted energy storage converter; θ represents the voltage angle; U PCS_a Indicates the input side A phase voltage of the high-voltage direct-mounted energy storage converter; U PCS_b Indicates the input side B phase voltage of the high-voltage direct-mounted energy storage converter; U PCS_c Indicates the input side C phase voltage of the high-voltage direct-mounted energy storage converter;

[0058] I PCS_d It represents the active component of the input current of the high-voltage direct-mounted energy storage converter, I PCS_q Represents the reactive component of the input current of the high-voltage direct-mounted energy storage converter, I PCS_a Indicates the input side A phase current of the high voltage direct-mounted energy storage converter, I PCS_b Indicates the input side B phase current of the high-voltage direct-mounted energy storage converter, I PCS_c Indicates the C-phase current on the input side of the high-voltage direct-mounted energy storage converter;

[0059] S4. Calculate the active current compensation instruction and reactive current compensation instruction of the high-voltage direct-mounted energy storage converter based on the voltage and current instruction of the gas turbine control system; calculate the three-phase output voltage instruction of the high-voltage direct-mounted energy storage converter based on the coordinate transformation;

[0060] Among them, the calculation formula of the high-voltage direct-mounted energy storage converter compensation active current instruction is:

[0061]

[0062] The calculation formula for the reactive current command of the high-voltage direct-mounted energy storage converter is:

[0063]

[0064] In the formula, Indicates the compensation active current instruction of the high-voltage direct-mounted energy storage converter; Indicates the current command of the gas turbine control system; Indicates the reactive current compensation instruction of the high-voltage direct-mounted energy storage converter.

[0065] The calculation formula of the dq axis voltage command of the high-voltage direct-mounted energy storage converter is:

[0066]

[0067] In the formula, Indicates the d-axis output voltage command of the high-voltage direct-mounted energy storage converter; Indicates the q-axis output voltage command of the high-voltage direct-mounted energy storage converter; K PCS_P Indicates the closed-loop proportional parameter of the high-voltage direct-mounted energy storage converter; K PCS_I represents the closed-loop integral parameter of the high-voltage direct-mounted energy storage converter; S represents the complex frequency variable; ω represents the angular velocity; L2 represents the inductance of the grid-connected reactor.

[0068] The calculation formula for the three-phase output voltage command of the high-voltage direct-mounted energy storage converter is:

[0069]

[0070] In the formula, Indicates the A-phase output voltage instruction of the high-voltage direct-mounted energy storage converter; Indicates the B-phase output voltage instruction of the high-voltage direct-mounted energy storage converter; Indicates the C-phase output voltage command of the high-voltage direct-mounted energy storage converter.

[0071] S5. The high-voltage direct-mounted energy storage converter sends the calculation results to the energy storage power unit, and each level of energy storage power unit outputs pulses to achieve reactive and active power compensation on the input side of the static starting inverter.

[0072] In this embodiment, the output voltage of the diesel generator drops during the black start of the gas turbine, and the high-voltage direct-mounted energy storage converter (PCS) has the ability to provide reactive and active power support for a short time;

[0073] In this embodiment, the black start process of the gas turbine in the case of no power supply from the power grid is realized, and the starting process of the gas turbine in the case of abnormal power supply from the power grid is also guaranteed.

[0074] The high-voltage direct-mounted energy storage converter (PCS) has a redundant design function. Under the condition that a reasonably designed number of energy storage power units fail, it can bypass the failed energy storage power unit and continue to complete the input side reactive and active power compensation function of the static starting converter (SFC).

[0075] To sum up, with the help of the above-mentioned technical scheme of the present invention, the gas turbine black start system and method based on high-voltage direct-mounted energy storage inverter proposed in the present invention solves the problem of starting failure caused by unstable power supply of the static starting inverter, and effectively reduces the influence of harmonics, voltage sag, power fluctuation and other problems on the power supply side of the static starting inverter during the black start of the gas turbine on the starting process.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas turbine black start system based on a high voltage direct mounted energy storage converter, characterized in that: The gas turbine black start system based on high-voltage direct-mounted energy storage converter includes a high-voltage direct-mounted energy storage converter, a static starting frequency converter, an excitation system, a diesel generator, a gas turbine, a busbar, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, an output reactor L1 and a grid-connected reactor L2; The busbar is connected to the power grid and the diesel generator output through the circuit breaker QF1 and the circuit breaker QF2 respectively, the gas turbine is connected to the busbar through the circuit breaker QF5, the static start frequency converter and the circuit breaker QF4 in sequence, the high-voltage direct-mounted energy storage converter is connected to the busbar through the circuit breaker QF3, the excitation system receives the excitation instruction of the static start frequency converter control system, and the output end of the excitation system is connected to the gas turbine; The high-voltage direct-mounted energy storage converter is composed of a high-voltage direct-mounted energy storage converter control system, a plurality of energy storage power units and a grid-connected reactor L2, and the high-voltage direct-mounted energy storage converter control system is communicatively connected with each energy storage power unit for collecting state information, fault information, mode information and instruction information for interaction, the energy storage power unit is used to store / release electric energy, and the three-phase output of the high-voltage direct-mounted energy storage converter is connected to the power grid through the grid-connected reactor L2; The static starting inverter is composed of a split transformer T, a rectifier circuit, a DC circuit, an inverter circuit, an output inductor L1 and a static starting inverter control system. The output end of the split transformer T is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the inverter circuit through the DC circuit, and the output end of the inverter circuit is connected to the output inductor L1.

2. A gas turbine black start system based on a high voltage direct mounted energy storage converter according to claim 1, characterized in that: The AC ports of the energy storage power units are connected in series, the first-stage AC ports not connected to other energy storage power units are connected to each other to form a neutral point, and the N-stage AC ports not connected to other energy storage power units form a three-phase AC interface; The DC side of the energy storage power unit is connected to a battery or other energy storage element. The high-voltage direct-mounted energy storage inverter control system controls the energy storage power unit through optical fiber communication, converts the DC power stored in the battery into AC power, and realizes a two-way flow of electric energy.

3. A gas turbine black start system based on a high voltage direct mounted energy storage converter according to claim 1, characterized in that: The energy storage power unit transmits unit information to the high-voltage direct-mounted energy storage converter control system, thereby enabling the high-voltage direct-mounted energy storage converter control system to monitor and protect the energy storage power unit in real time.

4. A gas turbine black start system based on a high voltage direct mounted energy storage converter according to claim 1, characterized in that: The rectifier circuit includes AC-DC converters AC / DC1 and AC / DC2, the DC circuit includes a reactor L3, and the inverter circuit includes a DC-AC converter DC / AC; The split transformer T is respectively connected to the AC sides of the AC-DC converter AC / DC1 and the AC-DC converter AC / DC2, and the DC sides of the AC-DC converter AC / DC1 and the AC-DC converter AC / DC2 are connected in series and connected to the DC-AC converter DC / AC through the reactor L3.

5. A gas turbine black start system based on a high voltage direct mounted energy storage converter according to claim 1, characterized in that: It also includes a gas turbine control system, and the gas turbine control system sends voltage and current instructions to the high-voltage direct-mounted energy storage converter control system of the high-voltage direct-mounted energy storage converter and the static starting inverter control system of the static starting inverter.

6. A gas turbine black start system based on a high voltage direct mounted energy storage converter according to claim 1, characterized in that: When the circuit breakers QF1 and QF3 are closed, and the circuit breakers QF2 and QF4 are opened, the high-voltage direct-mounted energy storage converter is connected to the power grid to charge the battery in the energy storage power unit, thereby ensuring that the charge state of the battery in the energy storage power unit is normal before the black start; When the circuit breakers QF2 and QF3 are closed, and the circuit breakers QF1 and QF4 are opened, the high-voltage direct-mounted energy storage converter is connected to the diesel generator to charge the battery in the energy storage power unit, thereby ensuring that the charge state of the battery in the energy storage power unit is normal before the black start; When the circuit breakers QF2, QF3, QF4 and QF5 are closed, and the circuit breaker QF1 is opened, the diesel generator, the high-voltage direct-mounted energy storage inverter and the input side of the static starting inverter are connected to realize the black start of the gas turbine based on the high-voltage direct-mounted energy storage inverter.

7. A gas turbine black start system based on a high voltage direct mounted energy storage converter according to claim 1, characterized in that: The three-phase voltage signal and current signal on the output side of the high-voltage direct-mounted energy storage converter and the input side current signal of the static starting converter are connected to the sampling interface of the high-voltage direct-mounted energy storage converter through sensors.

8. A gas turbine black start method based on a high voltage direct mounted energy storage converter, implemented based on a gas turbine black start system based on a high voltage direct mounted energy storage converter as claimed in any one of claims 1 to 7, characterized in that: The black start method of a gas turbine based on a high-voltage direct-mounted energy storage converter comprises the following steps: S1, when circuit breakers QF2, QF3, QF4 and QF5 are closed, start the diesel generator to the power frequency, so that the high-voltage direct-mounted energy storage converter completes pre-charging and is in hot standby state; S2, start the high-voltage direct-mounted energy storage converter and the static starting inverter, and use the static starting inverter to drive the gas turbine to start; use the high-voltage direct-mounted energy storage converter to detect the three-phase voltage and current on the output side in real time, and detect the input side current of the static starting inverter at the same time; S3, obtain the voltage angle through the phase-locked loop module, calculate the active component of the voltage on the input side of the high-voltage direct-mounted energy storage converter and the active component of the current on the input side of the high-voltage direct-mounted energy storage converter according to the voltage and current on the input side of the high-voltage direct-mounted energy storage converter, and calculate the active component and reactive component of the current on the input side of the static starting inverter according to the input side current of the static starting inverter; S4. Calculate the active current compensation instruction and reactive current compensation instruction of the high-voltage direct-mounted energy storage converter based on the voltage and current instruction of the gas turbine control system; calculate the three-phase output voltage instruction of the high-voltage direct-mounted energy storage converter based on the coordinate transformation; S5. The high-voltage direct-mounted energy storage converter sends the calculation results to the energy storage power unit, and each level of energy storage power unit outputs pulses to achieve reactive and active power compensation on the input side of the static starting inverter.

9. A gas turbine black start method based on a high voltage direct mounted energy storage converter according to claim 8, characterized in that: The high-voltage direct-mounted energy storage converter has the capability of providing reactive and active power support in a short time and a redundant design function. When a preset number of energy storage power units fail, the faulty energy storage power units can be bypassed to continue to complete the reactive and active power compensation function on the input side of the static starting inverter.

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