Offshore wind power flexible direct system active energy control and ac energy consumption device coordination method

Abstract

The application discloses a method for coordinating active energy recovery and AC energy consumption device of offshore wind power flexible direct current system, and belongs to the field of power system transmission and distribution. After the AC power grid fails, the DC voltage is first lifted, and after the capacitor energy of the onshore converter station reaches the early warning value, the capacitor energy of the offshore converter station is lifted to the preset maximum value. If the fault is cleared before the AC circuit breaker is opened, the DC voltage, the capacitor energy of the onshore and offshore converter stations are controlled to decrease to the rated value in turn; otherwise, the AC energy consumption device is put into operation, and the onshore converter station is switched to energy-AC voltage control. After the circuit breaker is reclosed, the energy consumption device is withdrawn, the onshore converter station is switched back to the initial control, and the DC voltage, the capacitor energy of the onshore and offshore converter stations are controlled to decrease to the rated value in turn. The application can reduce the waste caused by the dissipation of surplus power in heat; compared with the DC energy consumption device, the application can also greatly reduce the cost and control complexity of the energy consumption device.

Description

Technical Field

[0001] This invention belongs to the field of power system transmission and distribution, and more specifically, relates to a method for coordinating active energy control and AC energy dissipation devices in offshore wind power flexible DC systems. Background Technology

[0002] Flexible DC transmission technology (MMC-HVDC) has become one of the main grid connection solutions for large-scale, long-distance offshore wind power. The offshore wind power MMC-HVDC grid connection system mainly includes: offshore wind farm, offshore converter station, onshore converter station, and onshore AC main grid. After an AC fault occurs in the onshore AC grid, the power transmitted from the onshore converter station to the onshore AC main grid decreases. However, because the offshore wind farm continues to input full power into the MMC-HVDC system, this causes a large amount of surplus power in the DC system, resulting in severe overvoltage and endangering the safe operation of the system.

[0003] To address the surplus power issue in flexible DC systems, a common engineering solution is to install DC power dissipation devices on the DC side of the onshore converter station. After a fault occurs, the DC voltage rises, triggering the DC power dissipation devices to dissipate the power transmitted from the wind farm as heat. Because the DC voltage rises rapidly, the DC power dissipation devices quickly activate to dissipate energy after a fault, resulting in some energy waste. Furthermore, the cost of DC power dissipation devices is high due to the numerous controllable switching devices. Especially for the widely used cascaded DC power dissipation devices with good electromagnetic compatibility and real-time controllable power dissipation, their control logic is complex, involving the sequencing of sub-modules and voltage equalization algorithms. In contrast, AC power dissipation devices have a simpler topology, lower cost, and require no complex switching control, further improving the engineering economy of flexible DC systems. However, the application of AC power dissipation devices in offshore wind power flexible DC grid-connected systems is currently limited, and coordinated control strategies are not yet mature. Summary of the Invention

[0004] To address the issues of surplus power waste and the economic efficiency of DC energy-consuming devices, this invention provides a method for coordinating active energy recovery and AC energy-consuming devices in offshore wind power flexible DC systems. The objectives are: 1) to utilize the energy margin of the flexible DC system to recover surplus power in the DC system during AC faults, reducing energy waste caused by heat dissipation; 2) to replace DC energy-consuming devices with AC energy-consuming devices, reducing the engineering cost of offshore flexible DC grid-connected systems and improving operational economics; and 3) to provide a technical solution for coordinating the operation of AC energy-consuming devices with offshore flexible DC grid-connected systems.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for coordinating active energy control and AC energy dissipation devices in an offshore wind power flexible DC system, comprising:

[0006] i) When a fault is detected in the onshore AC power grid, the onshore converter station uses DC voltage control to actively raise the DC system voltage to the preset voltage value V. dc_set Simultaneously, the reference value for energy control is set equal to the actual value. When the capacitor energy at the onshore converter station is detected to reach the warning value W... C_th Then, a command is sent to the offshore converter station to trigger its active energy recovery mechanism: the offshore converter station uses energy control according to a preset algorithm to raise the capacitor energy to a preset maximum value W. C_max And maintain constant capacitor energy;

[0007] ii) If the fault is cleared before the AC circuit breaker is opened, the onshore converter station uses active energy control to maintain a constant current capacitor energy. Simultaneously, the onshore converter station controls the DC voltage to decrease to its rated value; then, it controls the onshore converter station's capacitor energy to decrease to its rated value; subsequently, the onshore converter station sends a command to the offshore converter station, instructing the offshore converter station to control its capacitor energy to decrease to its rated value, thus ending the active energy recovery process of the flexible DC system.

[0008] iii) If the fault clearing was caused by the opening of the AC circuit breaker, then activate the AC energy dissipation device, and simultaneously switch the onshore converter station to energy-AC voltage control mode, and control the onshore converter station capacitor energy to maintain it at the preset maximum value W. C_max After the AC circuit breaker is successfully reclosed, the AC energy dissipation device is deactivated, and the onshore converter station switches back to energy control mode. Subsequently, the DC voltage controlled by the flexible DC system, the capacitor energy of the onshore converter station, and the capacitor energy of the offshore converter station are sequentially reduced to their rated values, ending the active energy recovery of the flexible DC system and the switching process of the AC energy dissipation device.

[0009] Furthermore, the active energy control of the converter station includes inner-loop control and outer-loop control. Specifically, for the onshore converter station, there are two control modes: i) in energy control mode, the outer loop of AC current control consists of a capacitor energy controller and a reactive power controller; ii) in energy-AC voltage control mode, the outer loop of AC current control consists of an energy-voltage controller and a reactive power controller; the outer loop of DC current control for the onshore converter station is a DC voltage controller. For the offshore converter station, the outer loop of AC current control is an AC voltage controller, and the outer loop of DC current control is a capacitor energy controller.

[0010] Furthermore, in the preset algorithm for energy recovery at the offshore station, when the offshore converter station receives an early warning command from the onshore converter station, it actively controls its capacitor energy to increase linearly with the rated DC power as the slope, so as to be able to absorb all the power of the wind farm.

[0011] Furthermore, the AC energy dissipation device is installed on the shore AC side, and structurally, each phase consists of a controllable thyristor valve and an energy dissipation resistor. The thyristor valve is used to control the switching of the AC energy dissipation device, and the energy dissipation resistor is used to dissipate excess power.

[0012] Furthermore, the energy-voltage controller is a deadbeat controller designed based on the dynamic equation of capacitor energy and AC side voltage at the onshore converter station. Specifically, the dynamic equation between capacitor energy and voltage is:

[0013]

[0014] In the formula, V S P represents the AC side voltage amplitude. ac and P dc R represents the AC and DC side power, R is the single-phase power consumption resistor of the AC power consumption device, and W is the power of the AC and DC sides. MMC1 This is for the energy of the MMC1 capacitor at the onshore converter station.

[0015] Furthermore, the transmission of signals and commands between the onshore converter station and the offshore converter station is an inter-station communication method, including but not limited to fiber optic communication and harmonic injection communication methods.

[0016] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0017] (1) The active energy recovery and AC energy dissipation device coordination method for offshore wind power flexible DC system constructed in this invention can utilize the energy margin of the flexible DC system to recover the surplus power generated by the wind farm during AC failures on shore, thereby delaying the commissioning of energy dissipation devices to the greatest extent and reducing the waste of electrical energy in the form of heat. At the same time, the use of AC energy dissipation devices can replace the DC energy dissipation devices widely used in current engineering projects. While achieving the same efficiency, it can also greatly reduce the engineering cost of offshore flexible DC grid-connected systems and improve operational economy.

[0018] (2) The energy-voltage control proposed in this invention enables the onshore converter to autonomously generate AC voltage, providing the voltage source required for the operation of AC energy-consuming devices. Simultaneously, this control can also regulate the energy of the onshore converter station capacitors by adjusting the AC voltage amplitude, overcoming the problem of overcharging or undercharging of the onshore converter station capacitors during faults caused by excessively long or short AC circuit breaker opening times, thus making more rational and effective use of the energy margin of the flexible DC system.

[0019] (3) The energy-voltage controller proposed in this invention is a deadbeat controller with relatively high controller PI parameters and simple and easy-to-implement control logic. Attached Figure Description

[0020] Figure 1This is a schematic diagram of a typical offshore wind power flexible DC grid-connected system containing AC energy dissipation devices;

[0021] Figure 2 A flowchart illustrating a method for coordinating active energy recovery and AC energy dissipation devices in an offshore wind power flexible DC system, as provided in an embodiment of the present invention.

[0022] Figure 3 Control block diagram of the onshore converter station for the offshore wind power flexible DC system provided by the present invention;

[0023] Figure 4 A control block diagram of the energy-voltage controller under the energy-voltage control mode of the onshore converter station provided by the present invention;

[0024] Figure 5 The control block diagram of the offshore wind power flexible DC system offshore converter station provided by the present invention;

[0025] Figure 6 The simulation results of the offshore wind power flexible DC system provided by the present invention under a two-phase (BC phase) metallic grounding fault on the AC side of the shore are shown in the figure. (a) is the capacitor energy and reference value of the shore converter station, (b) is the capacitor energy and reference value of the offshore converter station, (c) is the DC voltage of the system, and (d) is the power of the shore converter station.

[0026] Figure 7 The simulation results of the offshore wind power flexible DC system provided by this invention under a three-phase metallic grounding fault on the onshore AC side are shown in the figure. (a) is the capacitor energy and reference value of the onshore converter station, (b) is the capacitor energy and reference value of the offshore converter station, (c) is the DC voltage of the system, and (d) is the power on the onshore converter station side. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Figure 1 This is a typical offshore wind power grid-connected system structure with AC energy dissipation devices, mainly including an offshore wind farm, an onshore converter station MMC1, an offshore converter station MMC2, and a current-limiting reactor L. dc The system comprises AC energy dissipation devices, AC circuit breakers, and the AC main grid. Each phase of the AC energy dissipation device consists of a controllable thyristor valve and an energy-dissipating resistor. The controllable thyristor valve is composed of bidirectional, reverse-parallel thyristors.

[0029] Figure 2A flowchart illustrating a method for coordinating active energy recovery and AC energy dissipation devices in an offshore wind power flexible DC system, provided as an embodiment of the present invention. The process specifically includes:

[0030] i) When a fault is detected in the onshore AC power grid, the onshore converter station uses DC voltage control to actively raise the DC system voltage to the preset voltage value V. dc_set Simultaneously, the reference value for energy control is set equal to the actual value. When the capacitor energy at the onshore converter station is detected to reach the warning value W... C_th Then, a command is sent to the offshore converter station to trigger its active energy recovery mechanism: the offshore converter station uses energy control according to a preset algorithm to raise the capacitor energy to a preset maximum value W. C_max And maintain constant capacitor energy.

[0031] ii) If the fault is cleared before the AC circuit breaker is opened, the onshore converter station uses active energy control to maintain a constant current capacitor energy. Simultaneously, the onshore converter station controls the DC voltage to decrease to its rated value; then, it controls the onshore converter station's capacitor energy to decrease to its rated value; subsequently, the onshore converter station sends a command to the offshore converter station, instructing the offshore converter station to control its capacitor energy to decrease to its rated value, thus ending the active energy recovery process of the flexible DC system.

[0032] iii) If the fault clearing was caused by the opening of the AC circuit breaker, then activate the AC energy dissipation device, and simultaneously switch the onshore converter station to energy-AC voltage control mode, and control the onshore converter station capacitor energy to maintain it at the preset maximum value W. C_max After the AC circuit breaker is successfully reclosed, the AC energy dissipation device is deactivated, and the onshore converter station switches back to energy control mode. Subsequently, the DC voltage controlled by the flexible DC system, the capacitor energy of the onshore converter station, and the capacitor energy of the offshore converter station are sequentially reduced to their rated values, ending the active energy recovery of the flexible DC system and the switching process of the AC energy dissipation device.

[0033] Figure 3 This invention provides a control block diagram for an onshore converter station of an offshore wind power flexible DC system. The control loop includes an AC control loop and a DC control loop. For the DC control loop, the outer loop is a DC voltage controller used to control the DC voltage of the flexible DC system; the inner loop is a DC current controller. For the AC control loop, when the converter station operates in energy control mode, the outer loop consists of an energy controller and a reactive power controller; if the converter station operates in energy-AC voltage control mode, the outer loop control is an energy-voltage controller; in both modes, the inner loop control is an AC current controller.

[0034] Figure 4 The energy-voltage controller provided by this invention includes: energy-voltage control and AC voltage control. This controller is a deadbeat controller designed based on the dynamic equation of energy-AC voltage. The design principle is as follows:

[0035] After the AC circuit breaker is tripped, the onshore AC power dissipation device is activated. The AC side power of the onshore converter station MMC1 depends on the effective value of the AC side line voltage V. S The single-phase energy-consuming resistance value R of the energy-consuming device, i.e., the AC side power P. ac It can be represented as:

[0036]

[0037] Neglecting MMC arm losses, based on the dynamic characteristic equations of the MMC AC / DC sides, the capacitor energy W of MMC1 in the onshore converter station is... MMC1 Ultimately, it can be determined by the AC side power P ac DC-side power representation P dc :

[0038]

[0039] Therefore, the capacitor energy W of the onshore converter station can be obtained. MMC1 With the effective value of AC line voltage V S The mathematical relationship is:

[0040]

[0041] Where R is the single-phase energy-consuming resistance value of the AC energy-consuming device. Assume one control cycle of the controller is T. s Discretizing the above equation in the k-th control cycle yields:

[0042]

[0043] Among them, W MMC1 (k) represents the capacitor energy of the converter station in the k-th control cycle, P dc (k) represents the AC output power of the converter station in the k-th control cycle, in W. MMC1 (k+1) represents the expected capacitor energy of the converter station at the start of the (k+1)th control cycle. Further, the effective value of the line voltage V that should be generated on the AC side of the converter in the kth control cycle is obtained. s (k):

[0044]

[0045] Based on the above formula, design a deadbeat controller, and W MMC1 (k+1) using W MMC1 Instead, V s (k) Using V sref A substitute can be used to... Figure 4 The energy-voltage control shown is described. AC voltage control is well-known and will not be described in detail here.

[0046] Figure 5 This invention provides a control block diagram for an offshore wind power flexible DC transmission system's offshore converter station. The control loop includes an AC control loop and a DC control loop. For the DC control loop, the outer loop is an energy controller, and the inner loop is a DC current controller. For the AC control loop, the outer loop is an AC voltage controller, and the inner loop controls both AC current controllers.

[0047] This invention relates to a method for coordinating active energy recovery and AC energy dissipation devices in an offshore wind power flexible DC system. This method can recover surplus power from the DC system after a fault occurs in the onshore AC power grid, reducing waste caused by the dissipation of surplus power as heat. The proposed energy-voltage controller can solve the problems of instability and insufficient energy margin utilization caused by overcharging and undercharging of converter station capacitors after circuit breaker interruption; at the same time, the controller has few PI control parameters and is simple to operate.

[0048] To verify the effectiveness of the method of the present invention, a system was built in PSCAD / EMTDC as follows. Figure 1 The simulation model shown is of an offshore wind power flexible DC grid-connected system. Both the onshore and offshore control stations are designed according to... Figure 3 , Figure 4 , Figure 5 The design is complete. Among them, Figure 2 The main preset parameter values ​​involved in the control flow are shown in Table 1.

[0049] Table 1

[0050] Parameter name symbol Parameter value (per unit) System DC voltage preset value <![CDATA[V dc_set ]]> 1.2pu Converter station capacitor energy warning value <![CDATA[W C_th ]]> 1.96 pu Converter station capacitor energy preset maximum value <![CDATA[W C_max ]]> 2.25 PU

[0051] Figure 6 This figure shows the simulation results of the offshore wind power flexible DC grid-connected system provided by this invention under a two-phase (BC phase) metallic ground fault on the onshore AC side. The onshore AC fault occurs at 2.0s and lasts for 150ms. It is assumed that the AC circuit breaker opens 100ms after the fault and recloses successfully 600ms after opening. Figure 6 It can be seen that after the fault occurred, in order to prevent the onshore station energy controller from saturating, the reference value of the onshore station capacitor energy followed the actual value; at the same time, the DC voltage rapidly rose to the preset voltage value V. dc_s =1.2pu.

[0052] Between 2.0s and 2.059s, the AC power of the onshore converter station decreases, while the DC power remains at its rated value. Therefore, the converter station is passively charged, and its capacitor energy increases. At 2.059s, the onshore converter station's capacitor energy rises to the warning value of 1.96 pu. The onshore converter station sends a command to the offshore converter station, triggering the offshore converter station's active energy recovery mechanism: the offshore converter station controls its capacitor energy to rise to the preset maximum value of 2.25 pu according to a preset slope and then maintains it. Since the preset slope is the wind farm's rated power, the DC power is zero during the period when the offshore converter station's capacitor energy increases. Because the onshore converter station continues to transmit power to the AC grid, its capacitor energy decreases. After the offshore converter station completes energy recovery, the onshore converter station's capacitor energy continues to rise due to the power imbalance between the AC and DC sides.

[0053] At 2.1 seconds, the AC circuit breaker opens, and the AC energy dissipation device engages. Because fault clearing is caused by the circuit breaker opening, the onshore converter control mode switches to energy-AC voltage control mode. Simultaneously, due to the presence of AC voltage, the AC energy dissipation device begins energy dissipation. Figure 6 It can be seen that after the AC energy dissipation device is put into operation, the energy-voltage controller of the onshore converter station can control the rise of capacitor energy and maintain it at the preset maximum value of 2.25pu, making the maximum use of the capacitor energy of the onshore converter station and avoiding the waste of the capacitor energy margin of the onshore converter station.

[0054] At 2.7 seconds, the circuit breaker successfully reclosed, the energy-consuming device was deactivated, and the power of the AC energy-consuming device dropped to 0. Afterwards, the onshore converter station switched from energy-voltage control mode back to energy control mode, and controlled the DC voltage to drop to the rated value of 1.0 pu via the DC voltage controller. Once the DC voltage dropped to the rated value, the onshore converter station used energy control to maintain the capacitor energy at 1.0 pu. Subsequently, the offshore converter station used its energy controller to control its capacitor energy to drop to 1.0 pu. This completed the entire process of active energy recovery and AC energy-consuming device switching in a flexible DC system under an AC fault.

[0055] based on Figure 6 The results show that after an AC grid fault occurs, storing surplus power in the submodule capacitors of the converter station using energy control can cope with AC faults for a certain period of time and postpone the commissioning of AC energy-consuming devices. Furthermore, the energy-voltage controller proposed in this invention can quickly and accurately control the energy of the onshore converter station capacitors to a preset maximum value after the AC energy-consuming devices are commissioned, verifying the effectiveness of the energy-voltage controller. Simultaneously, after successful circuit breaker reclosing, the energy stored in the flexible DC system can be released to the AC grid using DC voltage control and energy control, avoiding the waste caused by directly dissipating surplus power as heat through energy-consuming devices after an AC fault.

[0056] Figure 7 The simulation results of the offshore wind power flexible DC grid-connected system provided by this invention under a three-phase metallic ground fault on the onshore AC side are shown in the figure. The onshore AC fault occurs at 2.0s and lasts for 80ms. It is also assumed that the AC circuit breaker's full breaking time is 100ms, so the AC circuit breaker will not break in this case. Figure 7 As can be seen, after the fault occurred, the reference value of the onshore station's capacitor energy followed the actual value; at the same time, the DC voltage rapidly rose to the preset voltage value V. dc_s =1.2pu.

[0057] During an AC fault, the onshore converter station passively charges due to power imbalance on both the AC and DC sides, causing its capacitor energy to rise. When the onshore converter station's capacitor energy reaches the warning value of 1.96 pu, it sends a command to the offshore converter station, triggering the offshore converter station's active energy recovery mechanism: the offshore converter station controls its capacitor energy to increase. Once the fault is cleared, because the circuit breaker remains open, AC energy-consuming devices will not be activated, and the onshore converter station will not switch control modes. Simultaneously, the onshore converter station uses energy control to maintain its current capacitor energy. Subsequently, the DC voltage, the onshore converter station's capacitor energy, and the offshore converter station's capacitor energy are sequentially controlled to decrease to their rated values.

[0058] based on Figure 7 The results show that after a short-duration AC grid fault, storing the surplus power in the submodule capacitors of the converter station by using energy control can completely avoid the need to put AC energy-consuming devices into operation, and also avoid the waste caused by directly using energy-consuming devices to dissipate the surplus power as heat after an AC fault.

[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for coordinating active energy control and AC energy dissipation devices in an offshore wind power flexible DC system, the offshore wind power flexible DC system comprising an offshore converter station, an onshore converter station, and onshore AC energy dissipation devices, characterized in that, The method includes the following steps: i) When a fault is detected in the onshore AC power grid, the onshore converter station uses DC voltage control to actively raise the DC voltage to the preset value. V dc_set Simultaneously, the reference value for energy control is set equal to the actual value; when the capacitor energy of the onshore converter station is detected to reach the warning value... W C_th Then, a command is sent to the offshore converter station to trigger its active energy recovery mechanism: the offshore converter station uses energy control to raise the capacitor energy to a preset maximum value according to a preset algorithm. W C_max And maintain constant capacitor energy; the active energy recovery mechanism of the offshore converter station is as follows: after receiving the early warning command from the onshore converter station, the offshore converter station actively controls its capacitor energy to increase linearly with the rated power of the wind farm as the slope. ii) If the fault is cleared before the AC circuit breaker is opened, the shore converter station uses active energy control to maintain the current capacitor energy constant; at the same time, the shore converter station controls the DC voltage to drop to the rated value and the capacitor energy to drop to the rated value; the shore converter station sends a command to the offshore converter station to control its capacitor energy to drop to the rated value, thus ending the active energy recovery process of the flexible DC system. iii) If the fault clearing is caused by the opening of the AC circuit breaker, then activate the onshore AC energy dissipation device, and simultaneously switch the onshore converter station to energy-AC voltage control mode, and control the onshore converter station capacitor energy to maintain at the preset maximum value. W C_max After the AC circuit breaker is successfully reclosed, the onshore AC energy dissipation device is deactivated, and the onshore converter station switches back to energy control mode. The DC voltage controlled by the flexible DC system, the capacitor energy of the onshore converter station, and the capacitor energy of the offshore converter station are sequentially reduced to their rated values, thus ending the active energy recovery of the flexible DC system and the switching process of the AC energy dissipation device.

2. The method for coordinating active energy control and AC energy dissipation devices in an offshore wind power flexible DC system according to claim 1, characterized in that, The energy control includes inner-loop control and outer-loop control. The inner-loop control includes AC current control and DC current control. Specifically, for the onshore converter station, in energy control mode, the AC current control outer loop consists of an energy controller and a reactive power controller; in energy-AC voltage control mode, the AC current control outer loop consists of an energy-voltage controller and a reactive power controller; and the DC current control outer loop consists of a DC voltage controller. For the offshore converter station, the AC current control outer loop consists of an AC voltage controller, and the DC current control outer loop consists of an energy controller.

3. The method for coordinating active energy control and AC energy dissipation devices in an offshore wind power flexible DC system according to claim 1, characterized in that, The AC energy dissipation device is installed on the AC side on shore and consists of controllable thyristor valves for controlling switching and energy dissipation resistors, among other equipment.

4. The method for coordinating active energy control and AC energy dissipation devices in an offshore wind power flexible DC system according to claim 2, characterized in that, The energy-AC voltage controller is a deadbeat controller that characterizes the dynamic equation between the capacitor energy and the AC side voltage of the onshore converter station. The specific dynamic equation between capacitor energy and voltage is as follows: in, V S This refers to the AC side voltage amplitude. P ac and P dc For AC and DC side power, R For single-phase energy-consuming resistors in AC energy-consuming devices, W MMC1 This is for the energy of the MMC1 capacitor at the onshore converter station.

5. The method for coordinating active energy control and AC energy dissipation devices in an offshore wind power flexible DC system according to claim 1, characterized in that, The transmission of commands and signals between the offshore converter station and the onshore converter station is conducted via inter-station communication.

6. A coordination system for active energy control and AC energy dissipation devices in an offshore wind power flexible DC system, characterized in that, include: Computer-readable storage media and processors; The computer-readable storage medium is used to store executable instructions; The processor is used to read executable instructions stored in the computer-readable storage medium and execute the active energy control and AC energy consumption device coordination method for offshore wind power flexible DC system according to any one of claims 1 to 5.

Images