A method and system for multi-device coordinated network construction control of a high-voltage direct-current power transmission system

Abstract

The application provides a kind of high voltage direct current transmission system multi-device coordinated network control method and system, method includes: receiving active power and voltage adjustment signal of dispatch system, detect system operating state and reactive power compensation state;Calculate active adjustment instruction and total reactive power compensation demand;Prior to call SVG dynamic compensation, when insufficient, according to the calculated switching capacitor group, generate active regulation instruction coordinated with reactive power compensation capacity;Step by step action reactive device and synchronous adjustment direct current active, until complete all instructions.The application breaks through the limitation of single device control, improves the control flexibility and voltage stability of new energy gathering area power grid, and reduces the switching frequency of capacitor group through the optimization of SVG and capacitor group coordinated scheduling, provides key technical support for the safe and economic operation of "double high" power system.

Description

Technical Field

[0001] This invention belongs to the field of power network technology, and relates to DC power transmission technology, specifically to a multi-device collaborative network control method and system for high voltage DC power transmission systems. Background Technology

[0002] With the advancement of the global energy transition, the power system is facing unprecedented changes. On the power generation side, the proportion of renewable energy sources with strong randomness and uncertainty is increasing, weakening the grid strength and even leading to a lack of conventional power support, resulting in a clear trend of power generation "hollowing out." On the load side, the proportion of power electronic loads powered by converters is constantly rising. The power system exhibits the "dual high" characteristics of high proportion of renewable energy and high proportion of power electronic power, posing significant threats to the operation of the existing power system in terms of active / reactive power dispatch and frequency / voltage support.

[0003] Power electronic equipment boasts advantages such as flexibility, controllability, and rapid response, enabling fast active and reactive power control. It is a crucial resource for power grid dispatching, operation, and stability control. In LCC-HVDC (Traditional DC Transmission) systems, LCC converter stations can only control active power transmission and lack reactive power control capabilities, requiring reactive power to be absorbed from the AC system. Reactive power and voltage regulation in LCC-HVDC systems primarily involves controlling the switching of capacitors and reactors centrally compensated at the AC bus or the reactive power output of SVG (Static Var Generator) devices. However, the switching time of parallel capacitors and reactors is relatively long, and they can only provide step-like static reactive power compensation, lacking precise continuous adjustment and active reactive power support capabilities. While SVG devices possess rapid dynamic adjustment capabilities, enabling rapid smoothing of reactive power and voltage fluctuations in converter stations and offering fast and flexible dynamic reactive power adjustment, their support capacity is limited.

[0004] While power electronic equipment is flexible and controllable, its active power control or reactive power support capabilities are limited for a single device. Therefore, coordination between multiple types of power electronic equipment or with traditional reactive power compensation equipment is necessary. This involves leveraging the complementary control functions of various devices such as DC converter stations, SVG (Static Var Generator), and capacitor banks in terms of active power, reactive power, and voltage. This collaborative network construction, encompassing active power control and voltage / reactive power support, decouples the central point voltage from the transmitted active power while ensuring the AC bus voltage of the converter station remains within permissible limits, thereby improving the control flexibility and voltage stability of the power grid in areas with abundant renewable energy. Currently, feasible technical solutions are lacking in existing technologies. Summary of the Invention

[0005] To address the challenges of active / reactive power coordination and voltage stability in power systems with high proportions of renewable energy and power electronic equipment, this invention provides a collaborative grid control method for DC transmission systems based on multiple types of reactive power compensation equipment, including Static Var Generators (SVG) and parallel capacitor banks. By integrating the active power control capabilities of LCC converter stations with the reactive power control capabilities of SVG and capacitor banks, a multi-equipment collaborative grid control method is constructed to achieve decoupled control of the central point voltage and transmitted active power, while ensuring that the AC bus voltage of the converter station remains within the allowable range.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A multi-equipment collaborative grid control method for a high-voltage direct current transmission system includes the following steps:

[0008] Step 1: After receiving the active power adjustment signal and voltage adjustment signal issued by the dispatching system, detect the system operating status and reactive power compensation status, and calculate the corresponding active power adjustment command for the DC transmission system;

[0009] Step 2: Calculate the total reactive power compensation requirement of the DC system during the active power and voltage adjustment process, including: the reactive power compensation required to maintain the voltage stability of the high-voltage side bus of the converter transformer during the active power adjustment process, and the reactive power compensation required to adjust the voltage of the central point to the target value.

[0010] Step 3: Based on the reactive power compensation status and total reactive power compensation demand, determine the type and number of devices participating in the compensation, and obtain the reactive power compensation device action instructions: When the available reactive power capacity of the SVG can meet the system adjustment requirements, calculate the reactive power output of the SVG and perform reactive power compensation through the SVG; if the available reactive power capacity of the SVG is insufficient, calculate the number of capacitor banks that need to be switched, calculate the reactive power output of the SVG, and the SVG will bear the remaining reactive power demand after the capacitor banks are switched.

[0011] Step 4: Calculate the active power regulation command of the DC system that is coordinated with the reactive power compensation capacity of the single reactive power compensation device, so that reactive power compensation and active power regulation are synchronized and coordinated.

[0012] Step 5: Execute the action of the reactive power compensation device step by step, and adjust the DC active power synchronously until all active power and voltage adjustment commands are completed, so as to achieve decoupled control of the central point voltage and active power.

[0013] Furthermore, in step 1, the system operating status includes: the active power, reactive power, AC voltage, DC voltage, DC current, DC converter station trigger angle, turn-off angle, and commutation angle at the central point; the reactive power compensation status includes: the type, quantity, and reactance value of various reactive power compensation devices in the system, including the quantity and reactance value of reactive capacitors, the quantity and reactance value of AC filters, and the current reactive power output and available capacity of the SVG.

[0014] Furthermore, the active power adjustment command corresponding to the DC transmission system in step 1 is calculated as follows:

[0015]

[0016] In the formula, P*1 is the target value for adjusting the active power at the central point, P1 is the current active power value at the central point, and U pcc1 U pcc2 R1 and X2 are the voltage at the central point and the voltage at the high-voltage side of the converter transformer, respectively, and R2 and X2 are the resistance and reactance of the line, respectively.

[0017] Furthermore, in step 2, the total reactive power compensation requirement Q of the system... d Calculate as follows:

[0018]

[0019] In the formula, ΔQ pcc2 The reactive power compensation required to maintain the voltage stability of the high-voltage side bus of the converter transformer, ΔQ v This is the amount of reactive power compensation required to adjust the central point voltage to the target value.

[0020] Where, ΔQ pcc2 Calculate as follows:

[0021]

[0022] In the formula, ΔQ2 is the reactive power change of the AC line, and ΔQ conv P1 represents the reactive power consumption of the LCC converter; P2 and Q2 represent the active and reactive power transmitted by the high-voltage side bus of the converter transformer, respectively; P dc φ represents the active power currently being transmitted by the DC transmission system; φ and φ' are the converter power factor angles before and after power adjustment, respectively.

[0023] ΔQ v Calculate as follows:

[0024]

[0025] In the formula, U*pcc1 and Upcc1 are the adjustment target value and measured value of the central point voltage, respectively; X acThis represents the equivalent reactance value of the AC system.

[0026] Furthermore, step 3 specifically includes the following sub-steps:

[0027] Step 3-1, determine the available reactive power capacity Q of the SVG. svg,可用 Can it meet the system adjustment requirements? Q d If the SVG capacity can meet the reactive power demand, then reactive power compensation is performed through the SVG, and the capacitor bank does not operate. In this case, the reactive power output of the SVG is calculated as follows:

[0028]

[0029] In the formula, Q svg Output reactive power reference value for SVG;

[0030] After the SVG outputs reactive power as required, proceed to step 4; if the SVG capacity cannot meet the reactive power demand, proceed to step 3-2.

[0031] Step 3-2, the number of capacitors to be switched is calculated as follows:

[0032]

[0033] In the formula, n c Q represents the number of capacitors switched on and off. c,k This represents the reactive power compensation for each group of capacitors; ⌊⌋ indicates rounding down.

[0034] Step 3-3: After the capacitor bank switching reaches its maximum capacity, the remaining reactive power compensation requirement is borne by the SVG. The reactive power output of the SVG is calculated using the following formula:

[0035]

[0036] Wherein, ΔQ' pcc2 is the residual reactive power demand at point PCC on the high-voltage side of the converter transformer, calculated by the following formula:

[0037]

[0038] In the formula, ΔP dc For active power adjustment commands in DC transmission systems, U dc0 U is the ideal no-load DC voltage for the converter station. dc ΔP2 represents the DC voltage of the converter station, and ΔP2 represents the active power adjustment of the AC line.

[0039] Furthermore, if the remaining reactive power compensation demand exceeds the reactive power output limit of the SVG, the reactive power output of the SVG is calculated using the following formula:

[0040]

[0041] In the formula, Q svgA+ Output reactive power limit values ​​for SVG.

[0042] Furthermore, the active power regulation command of the DC system that is coordinated with the reactive power compensation capacity of the single reactive power compensation device in step 4 is calculated by solving the following equations:

[0043]

[0044] In the formula, ΔP is the active power of a single adjustment.

[0045] Further, step 5 specifically involves: each time the reactive power device action obtained in step 3 is executed, the DC active power is immediately adjusted according to the instruction calculated in step 4, and it is determined whether the system active power and voltage have reached the target value. If the target value is reached, a corresponding reactive power compensation scheme is generated; if the target value is not reached: if the reactive power compensation device has an adjustment margin, steps 1-5 are repeated; if the reactive power compensation device does not have an adjustment margin, the process is terminated.

[0046] Furthermore, the reactive power device operation includes: SVG adjustment or single-group capacitor switching.

[0047] The present invention also provides a computer system, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the multi-device collaborative network control method for high-voltage direct current transmission systems provided by the present invention.

[0048] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0049] This invention integrates the active power control capabilities of LCC converter stations with the reactive power control capabilities of SVG and capacitor banks, breaking through the limitations of single-device control. It achieves decoupled control of central point voltage and transmitted active power, and maintains the AC bus voltage of the converter station within the allowable range, improving the control flexibility and voltage stability of the power system. In addition, by optimizing the coordinated scheduling of SVG and capacitor banks, the frequency of capacitor switching can be reduced, thereby reducing costs. This provides key technical support for the safe and economical operation of "high-voltage and high-efficiency" power systems, and is especially suitable for areas with abundant new energy sources. Attached Figure Description

[0050] Figure 1 This is an implementation architecture diagram of the multi-device collaborative network control method for high-voltage direct current transmission systems provided by the present invention.

[0051] Figure 2 A schematic diagram of the multi-device collaborative network control method for high-voltage direct current transmission systems provided by the present invention.

[0052] Figure 3In the example, (a), (b), and (c) represent the active power transmitted by the hub node, the hub node voltage, and the voltage at point PCC2, respectively. Detailed Implementation

[0053] The technical solutions provided by the present invention will be described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0054] This invention discloses a multi-device collaborative grid control method for a high-voltage direct current transmission system, the implementation architecture of which is as follows: Figure 1 As shown, the process is as follows: Figure 2 As shown, the specific steps include:

[0055] Step 1: Upon receiving the active power adjustment signal and voltage adjustment signal from the dispatch system, check the system operating status and reactive power compensation status. The system operating status includes the current electrical quantities, such as active power, reactive power, AC voltage at the central point, and DC voltage, DC current, DC converter station firing angle, shutdown angle, and commutation angle. The reactive power compensation status includes the type, quantity, and reactance values ​​of various reactive power compensation devices within the system, including the number and reactance values ​​of reactive capacitors, the number and reactance values ​​of AC filters, and the current reactive power output and available capacity of the SVG. Then, calculate the corresponding active power adjustment command for the DC transmission system using the following method:

[0056]

[0057] In the formula, P*1 is the target value for adjusting the active power at the central point, P1 is the current active power value at the central point, and U pcc1 U pcc2 R1 and X2 are the voltage at the central point and the voltage at the high-voltage side of the converter transformer, respectively, and R2 and X2 are the resistance and reactance of the line, respectively.

[0058] Step 2: Calculate the total reactive power compensation requirement of the DC system during active power and voltage regulation. The total reactive power compensation requirement includes two parts: first, the reactive power compensation required to maintain the voltage stability of the high-voltage bus of the converter transformer during active power regulation; and second, the reactive power compensation required to adjust the central point voltage to the target value. The specific calculation method is as follows:

[0059]

[0060] In the formula, Q d ΔQ pcc2 ΔQ v These are the total reactive power compensation requirement of the system, the reactive power compensation required to maintain the stability of the high-voltage bus voltage of the converter transformer during the active power adjustment process, and the reactive power compensation required to adjust the central point voltage to the target value.

[0061] The reactive power compensation required to keep the high-voltage busbar of the converter transformer constant during active power adjustment is calculated as follows:

[0062]

[0063] In the formula, ΔQ pcc2 , ΔQ2, ΔQ conv These represent the reactive power compensation required to keep the high-voltage busbar of the converter transformer constant during active power adjustment, the reactive power change of the AC line, and the reactive power consumption of the LCC converter; P2 and Q2 represent the active power and reactive power transmitted by the high-voltage busbar of the converter transformer, respectively; P dc φ represents the active power currently being transmitted by the DC transmission system; φ and φ' represent the converter power factor angles before and after power adjustment, respectively.

[0064] The reactive power compensation required for central point voltage adjustment is calculated as follows:

[0065]

[0066] In the formula, U*pcc1 and Upcc1 are the adjustment target value and measured value of the central point voltage, respectively; X ac This represents the equivalent reactance value of the AC system.

[0067] Step 3: Based on the reactive power compensation status and total reactive power compensation demand, determine the type and quantity of devices participating in the compensation: Prioritize utilizing the dynamic reactive power capacity of the SVG (Static Var Generator). If the available capacity of the SVG is insufficient, calculate the number of capacitor banks that need to be switched on, and the remaining reactive power demand after the capacitor banks are switched on will still be borne by the SVG. This includes the following sub-steps:

[0068] Step 3-1: Determine whether the available reactive power capacity of the SVG can meet the system regulation requirements. If the SVG capacity can meet the reactive power demand, i.e., Q... svg,可用 ≥Q d In this case, reactive power compensation is preferentially performed through SVG, and the capacitor bank does not operate. The reactive power output of SVG is calculated as follows:

[0069]

[0070] In the formula, Q svg Output reactive power reference values ​​for SVG.

[0071] After the SVG outputs reactive power as required, proceed to step 4; if the reactive power requirement cannot be met, i.e., Q... svg,可用 <Q d Then proceed to step 3-2.

[0072] Step 3-2, the number of capacitors to be switched is calculated as follows:

[0073]

[0074] In the formula, n c Q represents the number of capacitors switched on and off. c,k This represents the reactive power compensation for each capacitor bank, where ⌊⌋ indicates rounding down.

[0075] Step 3-3: After the capacitor bank switching reaches its maximum capacity, the remaining reactive power compensation requirement is borne by the SVG. The reactive power output of the SVG is calculated using the following formula:

[0076]

[0077] Wherein, ΔQ' pcc2 is the residual reactive power demand at point PCC on the high-voltage side of the converter transformer, calculated according to the following formula:

[0078]

[0079] In the formula, ΔP dc For active power adjustment commands in DC transmission systems, U dc0 U is the ideal no-load DC voltage for the converter station. dc ΔP2 represents the DC voltage of the converter station, and ΔP2 represents the active power adjustment of the AC line.

[0080] If the remaining reactive power compensation demand exceeds the reactive power output limit of the SVG, the reactive power output of the SVG is calculated using the following formula:

[0081]

[0082] In the formula, Q svgA+ Output reactive power limit values ​​for SVG.

[0083] Step 4: Calculate the active power regulation command of the DC system that is coordinated with the reactive power compensation capacity of the single reactive power compensation device, so that reactive power compensation and active power regulation are synchronized and coordinated. Specifically, this is calculated by solving the following equations:

[0084]

[0085] In the formula, ΔP is the active power of a single adjustment.

[0086] Step 5: Execute the reactive power compensation device's actions step by step, and simultaneously adjust the DC active power until all active power and voltage adjustment commands are completed, achieving decoupled control of the central point voltage and active power. Specifically: Each time the reactive power device action (SVG adjustment or single capacitor switching and SVG undertaking the remaining reactive power compensation demand) is executed based on the results obtained in Step 3, the DC active power is immediately adjusted according to the commands calculated in Step 4. It is then determined whether the system's active power and voltage have reached the target values. If the active power and voltage meet the requirements, a corresponding reactive power compensation scheme is generated; if the active power and voltage do not meet the requirements, and the reactive power compensation device has adjustment margin, steps 1-5 are repeated; if the reactive power compensation device has no adjustment margin, the program is terminated.

[0087] The present invention also provides a computer system, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the multi-device collaborative network control method for high-voltage direct current transmission systems provided by the present invention.

[0088] Example:

[0089] A system was built in the PSCAD / EMTDC environment, such as... Figure 1 The LCC-HVDC simulation system is shown. The LCC rectifier side employs constant DC current control and minimum firing angle control, while the inverter side employs constant extinction angle control, constant inverter side current control, and current deviation control. Both the rectifier and inverter sides are equipped with low-voltage current limiting control circuits. The high-voltage side of the converter transformer is equipped with a capacitor compensator, and dynamic reactive power compensation equipment (SVG) is configured in the vicinity of the hub node. Relevant system parameters are shown in Table 1.

[0090] parameter value Rated AC voltage 220kV Rated DC voltage ±200kV Rated DC current 1kA rated reactive power compensation capacity of a single capacitor bank 50Mvar SVG capacity ±60MVA

[0091] Table 1

[0092] The target for adjusting the voltage at the hub node is to increase it from 225kV to 230kV, and the target for adjusting the active power is to increase it from 200MW to 500MW. According to the coordinated grid control method provided by this invention, the reactive power compensation demand is first predicted, and the total reactive power compensation amount is calculated. In the simulation example, the total reactive power compensation amount calculation shows that three sets of capacitor compensators need to be put into operation at the LCC converter station to participate in reactive power support, and the remaining reactive power compensation demand is borne by the SVG in the near-zone of the hub node. Subsequently, the corresponding active power adjustment command is calculated and adjusted. The hub node voltage and active power waveforms are shown below. Figure 3 .

[0093] Simulation results show that, compared with traditional dead-zone control and no control strategies, the cooperative control strategy proposed in this invention has good control effect. It can independently control the voltage and active power of the hub node at the same time, realize the active / reactive power cooperative grid construction function, and at the same time ensure that the DC system grid-side voltage operates within the operating range.

[0094] It should be noted that the above content merely illustrates the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, various improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-equipment collaborative grid control method for a high-voltage direct current transmission system, characterized in that, Includes the following steps: Step 1: After receiving the active power adjustment signal and voltage adjustment signal issued by the dispatching system, detect the system operating status and reactive power compensation status, and calculate the corresponding active power adjustment command for the DC transmission system; Step 2: Calculate the total reactive power compensation requirement of the DC system during the active power and voltage adjustment process, including: the reactive power compensation required to maintain the voltage stability of the high-voltage side bus of the converter transformer during the active power adjustment process, and the reactive power compensation required to adjust the voltage of the central point to the target value. Step 3: Based on the reactive power compensation status and total reactive power compensation demand, determine the type and number of devices participating in the compensation, and obtain the reactive power compensation device action instructions: When the available reactive power capacity of the SVG can meet the system adjustment requirements, calculate the reactive power output of the SVG and perform reactive power compensation through the SVG; if the available reactive power capacity of the SVG is insufficient, calculate the number of capacitor banks that need to be switched, calculate the reactive power output of the SVG, and the SVG will bear the remaining reactive power demand after the capacitor banks are switched. Step 4: Calculate the active power regulation command of the DC system that is coordinated with the reactive power compensation capacity of the single reactive power compensation device, so that reactive power compensation and active power regulation are synchronized and coordinated. Step 5: Execute the action of the reactive power compensation device step by step, and adjust the DC active power synchronously until all active power and voltage adjustment commands are completed, so as to achieve decoupled control of the central point voltage and active power.

2. The multi-equipment collaborative network control method for high-voltage direct current transmission systems according to claim 1, characterized in that, In step 1, the system operating status includes: active power, reactive power, AC voltage, DC voltage, DC current, DC converter station firing angle, shutdown angle and commutation angle; the reactive power compensation status includes: the type, quantity and reactance value of various reactive power compensation devices in the system, including the quantity and reactance value of reactive capacitors, the quantity and reactance value of AC filters, and the current reactive power output and available capacity of SVG.

3. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 1, characterized in that, The active power adjustment command corresponding to the DC transmission system in step 1 is calculated as follows: In the formula, P*1 is the target value for adjusting the active power at the central point, P1 is the current active power value at the central point, and U pcc1 U pcc2 R1 and X2 are the voltage at the central point and the voltage at the high-voltage side of the converter transformer, respectively, and R2 and X2 are the resistance and reactance of the line, respectively.

4. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 1, characterized in that, The total reactive power compensation requirement Q of the system in step 2 is... d Calculate as follows: In the formula, ΔQ pcc2 The reactive power compensation required to maintain the voltage stability of the high-voltage side bus of the converter transformer, ΔQ v This is the amount of reactive power compensation required to adjust the central point voltage to the target value. Where, ΔQ pcc2 Calculate as follows: In the formula, ΔQ2 is the reactive power change of the AC line, and ΔQ conv P1 represents the reactive power consumption of the LCC converter; P2 and Q2 represent the active and reactive power transmitted by the high-voltage side bus of the converter transformer, respectively; P dc φ represents the active power currently being transmitted by the DC transmission system; φ and φ' are the converter power factor angles before and after power adjustment, respectively. ΔQ v Calculate as follows: In the formula, U*pcc1 and Upcc1 are the adjustment target value and measured value of the central point voltage, respectively; X ac This represents the equivalent reactance value of the AC system.

5. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 1, characterized in that, Step 3 specifically includes the following sub-steps: Step 3-1, determine the available reactive power capacity Q of the SVG. svg,可用 Can it meet the system adjustment requirements? Q d : If the SVG capacity can meet the reactive power demand, then reactive power compensation is performed through the SVG, and the capacitor bank does not operate. In this case, the reactive power output of the SVG is calculated as follows: In the formula, Q svg Output reactive power reference value for SVG; After the SVG outputs reactive power as required, proceed to step 4; If the SVG capacity cannot meet the reactive power demand, proceed to step 3-2; Step 3-2, the number of capacitors to be switched is calculated as follows: In the formula, n c Q represents the number of capacitors switched on and off. c,k This represents the reactive power compensation for each group of capacitors; ⌊⌋ indicates rounding down. Step 3-3: After the capacitor bank switching reaches its maximum capacity, the remaining reactive power compensation requirement is borne by the SVG. The reactive power output of the SVG is calculated using the following formula: Wherein, ΔQ' pcc2 is the residual reactive power demand at point PCC on the high-voltage side of the converter transformer, calculated by the following formula: In the formula, ΔP dc For active power adjustment commands in DC transmission systems, U dc0 U is the ideal no-load DC voltage for the converter station. dc ΔP2 represents the DC voltage of the converter station, and ΔP2 represents the active power adjustment of the AC line.

6. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 5, characterized in that, In step 3-3, if the remaining reactive power compensation demand exceeds the reactive power output limit of the SVG, the reactive power output of the SVG is calculated using the following formula: In the formula, Q svgA+ Output reactive power limit values ​​for SVG.

7. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 1, characterized in that, In step 4, the active power regulation command of the DC system that is coordinated with the reactive power compensation capacity of the single reactive power compensation device is calculated by solving the following equations: In the formula, ΔP is the active power of a single adjustment.

8. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 1, characterized in that, Step 5 specifically involves: each time the reactive power device action obtained in step 3 is executed, the DC active power is immediately adjusted according to the instruction calculated in step 4, and it is determined whether the system active power and voltage have reached the target value. If the target value is reached, a corresponding reactive power compensation scheme is generated; if the target value is not reached: if the reactive power compensation device has an adjustment margin, steps 1-5 are repeated; if the reactive power compensation device does not have an adjustment margin, the process is terminated.

9. The multi-equipment collaborative grid control method for high-voltage direct current transmission systems according to claim 8, characterized in that, The actions of the reactive power device include: SVG adjustment or switching of a single capacitor group.

10. A computer system comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the multi-device collaborative grid control method for a high-voltage direct current transmission system provided in any one of claims 1-9.

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