Network-oriented power coordination control method for active main support of STATCOM

Abstract

This invention presents a grid-based STATCOM power coordination control method for active power support, addressing the challenge of balancing response speed and system stability in existing STATCOM control methods. It falls within the field of power quality management technology for distribution networks. The invention includes: calculating initial active and reactive current demands; prioritizing the initial reactive current demand within the device capacity limit when the voltage drop at the grid connection point exceeds a set threshold, utilizing the remaining capacity to output the initial active current demand and obtain a first-level reference current command; otherwise, if the total initial current demand exceeds the device capacity limit, proportionally compressing the initial active and reactive current demands to obtain a first-level reference current command; correcting the first-level reference current command based on the supercapacitor's state of charge to obtain a final reference current command, using this command to track the target, select the optimal voltage vector, and generate switching signals to control the STATCOM.

Description

Technical Field

[0001] This invention relates to a grid-type STATCOM power coordination control method for active power support, belonging to the field of power quality management technology for distribution networks. Background Technology

[0002] Currently, the penetration rate of distributed photovoltaic and wind power and other new energy sources in 380V low-voltage distribution networks is continuously increasing. However, due to the high impedance of low-voltage distribution network lines, they exhibit typical "weak grid" characteristics and low grid strength. When the output of new energy sources is random or the load fluctuates significantly, the system is prone to power quality problems such as frequency oscillations and sudden voltage drops on the bus caused by severe imbalances in short-term active power. Existing distribution network management methods are often unable to adapt to the complex operating conditions under such a high proportion of new energy access, posing a serious challenge to the stability of the power supply system.

[0003] To maintain voltage stability in distribution networks, static synchronous compensators (STATCOMs) are typically used for reactive power compensation. Existing STATCOMs only connect supporting capacitors on the DC side, essentially only exchanging reactive power with the grid and lacking active power throughput capabilities. When the distribution network faces frequency fluctuations or voltage drops caused by sudden changes in active load, existing STATCOMs cannot provide the necessary active power support, making it difficult to fundamentally mitigate energy imbalances in the system. To compensate for this deficiency, introducing energy storage units such as supercapacitors on the DC bus side to construct integrated energy storage STATCOMs has become a current research hotspot. These integrated energy storage STATCOMs can utilize the high power density characteristics of supercapacitors to achieve four-quadrant regulation of active and reactive power.

[0004] Despite the availability of hardware topologies, existing control strategies still have significant shortcomings. Firstly, existing STATCOM controls largely employ the existing PI dual-loop control architecture. In weak grid environments, system parameters are highly sensitive to changes, making PI controller parameter tuning difficult and resulting in inherent delays and overshoots, leading to slow dynamic response. This makes it impossible to provide fast and accurate power support during millisecond-level transient processes such as grid faults or load surges, failing to meet the high transient performance requirements of grid-connected equipment. Secondly, with the introduction of supercapacitors, coordinating active and reactive power output under limited capacity becomes crucial. Existing control strategies often decouple active and reactive power control, lacking a unified coordination mechanism and failing to fully consider the coupling relationship between device capacity limitations and the supercapacitor's state of charge (SOC). For example, during emergency voltage restoration, without proper power allocation, excessive active power output may crowd out reactive power capacity, leading to voltage support failure; or, forcibly outputting active power when the SOC is too low may cause equipment shutdown. Summary of the Invention

[0005] To address the problem that existing STATCOM control methods struggle to balance response speed and system stability, this invention provides a grid-based STATCOM power coordination control method for active power support.

[0006] The present invention provides a power coordination control method for a grid-based STATCOM system oriented towards active power support, comprising:

[0007] Obtain the three-phase voltage at the grid connection point, the generator-side current, and the inverter output current, and calculate the electrical components and the state of charge of the supercapacitor in the rotating coordinate system. ;

[0008] Based on the calculated electrical components, calculate the initial active current demand and the initial reactive current demand respectively.

[0009] When the voltage drop at the grid connection point exceeds a set threshold, it is determined to be in emergency voltage support mode, and a reactive power priority strategy is implemented: within the device capacity limit, the initial reactive current demand is prioritized, and the initial active current demand is output using the remaining capacity to obtain the first-level reference current command; otherwise, it is determined to be in power coordination mode: if the total initial current demand exceeds the device capacity limit, the initial active current demand and the initial reactive current demand are compressed proportionally to obtain the first-level reference current command.

[0010] Based on the state of charge of the supercapacitor The first-level reference current command is modified to obtain the final reference current command.

[0011] Using the final reference current command as the tracking target, the optimal voltage vector is selected, and a switching signal is generated to control STATCOM.

[0012] As a preferred approach, the reactive power priority strategy is implemented, resulting in the first-level reference current command as follows:

[0013]

[0014] The first-level reference current command includes the first-level reactive reference current. and the first-level active reference current , For the initial active current requirement, For the initial reactive current requirement, For the maximum allowable output current, This refers to the device's residual current capacity. .

[0015] As a preferred option, the power coordination mode is executed to obtain the first-level reference current command:

[0016] like Then output directly: .

[0017] like Then according to the scaling factor Perform proportional compression:

[0018]

[0019] The first-level reference current command includes the first-level reactive reference current. and the first-level active reference current , For the initial active current requirement, For the initial reactive current requirement, Total initial current requirement for maximum allowable output current .

[0020] Preferably, the method for modifying the first-stage reference current command based on the supercapacitor's state of charge (SOC) to obtain the final reference current command includes:

[0021] like and Then force set ;

[0022] like and Then force set ;

[0023] The final reference current command includes the final reactive reference current. and final active reference current .

[0024] Preferably, using the final reference current command as the tracking target, selecting the optimal voltage vector, and generating a switching signal to control STATCOM includes:

[0025] At the current sampling moment, obtain the current sampled values ​​of the grid connection point voltage and the inverter output current;

[0026] A discrete-time prediction model for a grid-connected inverter is established. This model is used to predict the inverter output current at the next moment based on the voltage vector at the current moment and the current sampled value.

[0027] Based on the final reference current command, a value function including current tracking error is constructed.

[0028] Traverse all candidate voltage vectors of the inverter, substitute each voltage vector into the discrete-time prediction model, calculate the corresponding predicted current, and substitute the predicted current into the value function to obtain the value function value corresponding to each voltage vector.

[0029] The voltage vector that minimizes the value function is selected as the optimal voltage vector, and the STATCOM is controlled according to the switching signal corresponding to the optimal voltage vector.

[0030] As a preferred option, the discrete-time prediction model for grid-connected inverters is:

[0031]

[0032] Among them, the predicted current includes active power predicted current. Reactive power prediction current , The equivalent resistance of the line. The system sampling period is This is the total value of the filter inductance. This represents the d-axis component of the sampled value at the current moment in the rotated coordinate system. This represents the q-axis component of the sampled value at the current moment in the rotating coordinate system. The fundamental angular frequency of the power grid. Let d be the d-axis component of the grid connection point voltage in the rotating coordinate system. Let q be the q-axis component of the grid connection point voltage in the rotating coordinate system. Let d be the d-axis component of the voltage vector at the current moment in the rotating coordinate system. The q-axis component of the voltage vector at the current moment in the rotating coordinate system.

[0033] Preferably, the method for calculating the initial active current demand and the initial reactive current demand based on the calculated electrical components includes:

[0034] High-frequency fluctuation components in the generator-side current are extracted using a high-pass filter. and for maintaining the state of charge of supercapacitors constant To obtain the initial active current requirement :

[0035]

[0036] For reference only. This is the outer ring ratio coefficient;

[0037] Obtain the initial reactive current requirement :

[0038]

[0039] This is the reference value for steady-state reactive current. This is the droop control coefficient. This is the reference value for the grid connection point voltage. This is the actual sampled value of the grid connection point voltage.

[0040] The beneficial effects of this invention are that by integrating a supercapacitor into the DC bus and coordinating active and reactive power control strategies, the device can actively suppress active power fluctuations while having reactive power compensation capabilities, significantly improving the frequency stability of weak power grids and solving the defect of traditional STATCOMs that cannot support active power.

[0041] The power coordination strategy proposed in this invention effectively resolves the conflict between the limited capacity of the device and multiple compensation objectives. In emergency situations involving sudden voltage drops in the power grid, it can automatically switch to a reactive power priority mode to prevent voltage collapse to the greatest extent possible; under normal operating conditions, it can also take into account the active power stabilization needs, achieving adaptive dynamic adjustment of the control objectives.

[0042] This invention uses model predictive control (MPC) to replace the traditional PI dual closed-loop control, eliminating the phase lag caused by the integral link. This enables the device to respond to power coordination commands in milliseconds, significantly enhancing the anti-disturbance capability of grid-connected equipment under complex operating conditions of weak power grids and improving the transient response speed of the system. Attached Figure Description

[0043] Figure 1 Main circuit topology diagram;

[0044] Figure 2 This is a control block diagram of the present invention;

[0045] Figure 3 This is a flowchart of the power coordination control strategy of the present invention;

[0046] Figure 4 Here is a flowchart of the model predictive control algorithm;

[0047] Figure 5 The voltage waveform at the grid connection point under operating conditions;

[0048] Figure 6 The output voltage and current waveforms of the compensator under the following operating conditions;

[0049] Figure 7 The active power of the new energy generation side and the active power at the grid connection point are under operating condition 2;

[0050] Figure 8 This represents the active and reactive power output of the STATCOM under operating condition two. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0053] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0054] This embodiment of the STATCOM power coordination control method for active power support in a grid-based system is based on... Figure 1 The topology shown is implemented. The system operating environment is set as follows: the system is connected to an AC distribution network with a preset voltage level and power frequency. For the weak grid application scenario addressed by this invention, an equivalent line impedance is connected in series at the point of common coupling (PCC) to simulate grid characteristics, and the system short-circuit ratio is set within a range that conforms to the characteristics of a weak grid (typically SCR < 3) to construct a typical test condition; a supercapacitor energy storage module is connected in parallel on the DC side of the STATCOM device, and this module is connected to the DC bus via a bidirectional DC / DC converter. The DC bus voltage is controlled at the rated value that meets the grid-connected inverter requirements.

[0055] This implementation of the STATCOM power coordination control method for active power support in a grid-based system first obtains the initial active and reactive current demands based on the real-time state decoupling of the distribution network. Taking into account device capacity limitations and supercapacitor SOC constraints, a multi-mode power coordination allocation strategy is established to dynamically determine the output priority of active and reactive currents. Furthermore, model predictive control (MPC) is introduced to replace traditional PI control. A discrete-time predictive model is used to perform rolling optimization of the output current at the next time step, achieving fast, steady-state error-free tracking of power coordination commands, thereby maximizing system stability under weak grid conditions. Specifically, it includes:

[0056] Step 1: Obtain the three-phase voltage at the grid connection point, the generator-side current, and the inverter output current, and calculate the electrical components and the state of charge of the supercapacitor in the rotating coordinate system. ;

[0057] Specifically, Hall effect sensors are used to collect the three-phase voltage at the PCC point in real time. Generator side current and inverter output current Three-phase voltage Real-time tracking of grid voltage phase using a phase-locked loop (PLL) The Park transformation is used to convert the components of the three-phase stationary coordinate system into components of a two-phase rotating coordinate system (dq coordinate system). , , as well as , Simultaneously, the terminal voltage of the supercapacitor is monitored in real time. and charging / discharging current The real-time state of charge is estimated using the ampere-hour integral method. This serves as a constraint variable for subsequent power coordination.

[0058] Step 2: Calculate the initial active current demand and the initial reactive current demand based on the calculated electrical components.

[0059] Initial reactive current demand It consists of two parts. One part is the steady-state reactive current reference value on the generation side. The other part is the compensation component required to maintain the stability of the PCC point voltage. This is achieved through a voltage outer-loop PI controller, which adjusts the grid connection point voltage reference value. Actual sampled value of grid connection point voltage The difference is converted into a voltage support current command. This yields the initial reactive current demand. :

[0060]

[0061] This is the droop control coefficient.

[0062] Initial active current demand It also consists of two parts. A high-pass filter is used to extract the high-frequency fluctuation component from the generator-side current. As a target for mitigation; simultaneously, to maintain the energy balance of the supercapacitor, SOC feedback control is introduced, which controls the SOC when it deviates from the reference value. When (e.g., 50%), a charging or discharging demand is generated. The formula is expressed as:

[0063]

[0064] This is the outer ring proportionality coefficient.

[0065] Step 3: When the voltage drop at the grid connection point exceeds a set threshold, it is determined to be in emergency voltage support mode, and a reactive power priority strategy is implemented: within the device capacity limit, the initial reactive current demand is prioritized, and the initial active current demand utilizes the remaining capacity output to obtain the first-level reference current command; otherwise, it is determined to be in power coordination mode: if the total initial current demand exceeds the device capacity limit, the initial active current demand and the initial reactive current demand are proportionally compressed to obtain the first-level reference current command; specifically including:

[0066] Implement multi-mode power coordination control strategies such as Figure 3 As shown, in order to resolve the conflict between limited device capacity and multi-objective control under weak power grid conditions, this embodiment designs a priority-based judgment mechanism.

[0067] Set voltage drop threshold It is 5% of the rated voltage (i.e., 19V). Calculate the voltage deviation at the PCC point. .

[0068] Operating Condition 1: Emergency Voltage Support Mode At this time, the power grid is in an extremely unstable state, and the control strategy automatically assigns the highest priority to reactive power.

[0069] First, reactive power demand is met, but truncation is performed within physical limits to obtain the first-level reference current command. The first-level reference current command includes the first-level reactive power reference current. and the first-level active reference current First-level reactive reference current :

[0070]

[0071] According to the capacity constraint equation Calculate the remaining active current capacity.

[0072]

[0073] First-level reactive reference current Output can only be made within the remaining capacity:

[0074]

[0075] Operating Condition 2: Power Co-operation Smoothing Mode ( At this point, the grid voltage is within the normal range, and the control objective shifts to power quality management (power factor correction + active power stabilization).

[0076] Calculate the total initial current requirement:

[0077]

[0078] like Then output directly: .

[0079] like Then according to the scaling factor Compress both proportionally:

[0080]

[0081] Step 4: Based on the state of charge of the supercapacitor The first-level reference current command is modified to obtain the final reference current command.

[0082] Regardless of the results of the above calculations, the final instruction must pass the SOC security check:

[0083] like (Over-release warning) and (Request discharge), then force reset:

[0084]

[0085] like (Overcharge warning) and (Request charging), then force setting:

[0086]

[0087] After the above logical processing, the final reference current command is obtained, including the final active reference current. and final reactive reference current .

[0088] Step 5: Using the final reference current command as the tracking target, select the optimal voltage vector and generate a switching signal to control the STATCOM. Specifically, using the final reference current command as the tracking target, selecting the optimal voltage vector, and generating a switching signal to control the STATCOM includes:

[0089] At the current sampling moment, obtain the current sampled values ​​of the grid connection point voltage and the inverter output current;

[0090] A discrete-time prediction model for a grid-connected inverter is established. This model is used to predict the inverter output current at the next moment based on the voltage vector at the current moment and the current sampled value.

[0091] Based on the final reference current command, a value function including current tracking error is constructed.

[0092] Traverse all candidate voltage vectors of the inverter, substitute each voltage vector into the discrete-time prediction model, calculate the corresponding predicted current, and substitute the predicted current into the value function to obtain the value function value corresponding to each voltage vector.

[0093] The voltage vector that minimizes the value function is selected as the optimal voltage vector, and the STATCOM is controlled according to the switching signal corresponding to the optimal voltage vector.

[0094] based on Figure 1 According to Kirchhoff's voltage law, the main circuit topology shown can be represented by the following loop equation in a three-phase stationary coordinate system:

[0095]

[0096] in, This is the total value of the filter inductance (which can be approximated as the sum of the inverter-side inductance and the grid-side inductance under LCL filtering, or as the equivalent inductance ignoring the influence of the high-frequency capacitor branch). The equivalent resistance of the line. The inverter output voltage vector. This represents the grid voltage vector.

[0097] To achieve decoupled control of active and reactive power, the Park transformation matrix is ​​used. Transform the above equations into a synchronously rotating coordinate system (dq). Considering the rotational coupling terms introduced by the coordinate transformation, the continuous state-space equations under the dq axis are derived as follows:

[0098]

[0099] in, The fundamental angular frequency of the power grid. and This is the coupling voltage term generated by coordinate rotation.

[0100] Since the controller is digitally sampled, the continuous differential equation needs to be transformed into a discrete difference equation. Using the first-order forward Euler method, let... ,in For the system sampling period (e.g.) (The result is that) after sorting through the information, we obtain the [number]. The discrete-time prediction model for the grid-connected inverter at time t is:

[0101]

[0102] Among them, the predicted current includes active power predicted current. Reactive power prediction current , The equivalent resistance of the line. The system sampling period is This is the total value of the filter inductance. This represents the d-axis component of the sampled value at the current moment in the rotated coordinate system. This represents the q-axis component of the sampled value at the current moment in the rotating coordinate system. The fundamental angular frequency of the power grid. Let d be the d-axis component of the grid connection point voltage in the rotating coordinate system. Let q be the q-axis component of the grid connection point voltage in the rotating coordinate system. Let d be the d-axis component of the voltage vector at the current moment in the rotating coordinate system. The q-axis component of the voltage vector at the current moment in the rotating coordinate system.

[0103] For a two-level three-phase voltage source inverter, its power switches (S1-S6) have eight legal switching combinations. These eight states correspond to eight basic space voltage vectors. : Valid vectors (6): Its module length is Their directions differ by 60 degrees. Zero vectors (2): and Its modulus is 0 and it is located at the origin of the coordinate system.

[0104] To evaluate which voltage vector is "best", a value function incorporating current tracking error is constructed. This embodiment uses absolute value error to reduce the amount of computation.

[0105]

[0106] in, Representing the voltage vectors ( ), This is the final reference command from the output of step 3, after power coordination and SOC correction. To make the first Substitute the voltage vector into the predicted value calculated by the model in step 4.

[0107] The flowchart of the model predictive control algorithm is as follows: Figure 4 As shown, the controller operates in each sampling period. The following loop is executed internally:

[0108] (1) Sampling and reading: Reading the current time grid voltage Inductor current and DC bus voltage .

[0109] (2) Obtain the target: Obtain reference instructions from the upper-level coordination controller. .

[0110] (3) Looping through: Let Determine based on the inverter switching state For example, when At that time, the corresponding three-phase voltage is Transform it into And Substitute the values ​​into the prediction formula from step 4 to calculate the predicted current. Substitute the predicted current into the value function of step 5 to calculate... ,at last Increment, repeat until... .

[0111] (4) Optimal decision: Compare the calculated values ​​of the 8 value functions. Find the minimum value Corresponding voltage vector .

[0112] (5) Signal output: The corresponding switching signal acts directly on the IGBT drive circuit.

[0113] To verify the effectiveness of the invention, a simulation model was built on a simulation platform, and simulation experiments were conducted under two working conditions.

[0114] Experimental Condition 1: In At that time, a transient fault occurred on the grid side, causing the PCC voltage to drop by 20%. In the method of this invention, the voltage deviation is detected. The system immediately enters "emergency voltage support mode." Within 5ms, the reactive current is pushed back to full load. Simulation waveform Figure 5 The results show that the PCC voltage recovers to above 0.9 pu within 20 ms, significantly enhancing voltage stability.

[0115] Experimental Condition 2: Sudden Changes in Active Power on the New Energy Generation Side At this time, the active power output from the generator side suddenly drops within the capacity range. Traditional STATCOMs can only compensate for reactive power and cannot smooth out active power surges, leading to grid frequency fluctuations. In this invention, however, the supercapacitor responds rapidly through the DC / DC side, and the MPC controller controls the inverter to output active current. Simulation waveforms are shown below. Figure 7 , Figure 8 The invention demonstrates that it can quickly compensate for active power surges, and the transient response time of current tracking is less than 20ms, which is far superior to traditional PI control.

[0116] In summary, this implementation method effectively solves the capacity constraints and multi-objective conflicts faced by grid-type equipment in weak grid environments by combining multi-layer power coordination strategies with model predictive control, and achieves comprehensive power quality management.

[0117] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A power coordination control method for a grid-based STATCOM system oriented towards active power support, characterized in that, include: Obtain the three-phase voltage at the grid connection point, the generator-side current, and the inverter output current, and calculate the electrical components and the state of charge of the supercapacitor in the rotating coordinate system. ; Based on the calculated electrical components, calculate the initial active current demand and the initial reactive current demand respectively. When the voltage drop at the grid connection point exceeds the set threshold, it is determined to be in emergency voltage support mode and a reactive power priority strategy is executed: within the device capacity limit, the initial reactive current demand is prioritized, and the initial active current demand is output using the remaining capacity to obtain the first-level reference current command. Otherwise, it is determined to be in power coordination mode: if the total initial current demand exceeds the device capacity limit, the initial active current demand and the initial reactive current demand are compressed proportionally to obtain the first-level reference current command. Based on the state of charge of the supercapacitor The first-level reference current command is modified to obtain the final reference current command. Using the final reference current command as the tracking target, the optimal voltage vector is selected, and a switching signal is generated to control STATCOM.

2. The STATCOM power coordination control method for active power support in a grid-based system as described in claim 1, characterized in that, Executing the reactive power priority strategy, the first-level reference current command is as follows: The first-level reference current command includes the first-level reactive reference current. and the first-level active reference current , For the initial active current requirement, For the initial reactive current requirement, For the maximum allowable output current, This refers to the device's residual current capacity. .

3. The STATCOM power coordination control method for active power support in a grid-based system as described in claim 1, characterized in that, Execute the power co-operation mode and obtain the first-stage reference current command: like Then output directly: ; like Then according to the scaling factor Perform proportional compression: The first-level reference current command includes the first-level reactive reference current. and the first-level active reference current , For the initial active current requirement, For the initial reactive current requirement, Total initial current requirement for maximum allowable output current .

4. The STATCOM power coordination control method for active power support in a grid-based system as described in claim 1, characterized in that, The methods for correcting the first-stage reference current command based on the supercapacitor's state of charge (SOC) to obtain the final reference current command include: like and Then force set ; like and Then force set ; The final reference current command includes the final reactive reference current. and final active reference current .

5. The STATCOM power coordination control method for active power support in a grid-based system as described in claim 1, characterized in that, Using the final reference current command as the tracking target, the optimal voltage vector is selected, and a switching signal is generated to control STATCOM, including: At the current sampling moment, obtain the current sampled values ​​of the grid connection point voltage and the inverter output current; A discrete-time prediction model for a grid-connected inverter is established. This model is used to predict the inverter output current at the next moment based on the voltage vector at the current moment and the current sampled value. Based on the final reference current command, a value function including current tracking error is constructed. Traverse all candidate voltage vectors of the inverter, substitute each voltage vector into the discrete-time prediction model, calculate the corresponding predicted current, and substitute the predicted current into the value function to obtain the value function value corresponding to each voltage vector. The voltage vector that minimizes the value function is selected as the optimal voltage vector, and the STATCOM is controlled according to the switching signal corresponding to the optimal voltage vector.

6. The STATCOM power coordination control method for active power support in a grid-based system according to claim 1, characterized in that, The discrete-time prediction model for grid-connected inverters is as follows: Among them, the predicted current includes active power predicted current. Reactive power prediction current , The equivalent resistance of the line. The system sampling period is This is the total value of the filter inductance. This represents the d-axis component of the sampled value at the current moment in the rotated coordinate system. This represents the q-axis component of the sampled value at the current moment in the rotating coordinate system. The fundamental angular frequency of the power grid. Let d be the d-axis component of the grid connection point voltage in the rotating coordinate system. Let q be the q-axis component of the grid connection point voltage in the rotating coordinate system. Let d be the d-axis component of the voltage vector at the current moment in the rotating coordinate system. The q-axis component of the voltage vector at the current moment in the rotating coordinate system.

7. The STATCOM power coordination control method for active power support in a grid-based system according to claim 1, characterized in that, The methods for calculating the initial active current demand and the initial reactive current demand based on the calculated electrical components include: High-frequency fluctuation components in the generator-side current are extracted using a high-pass filter. and for maintaining the state of charge of supercapacitors constant To obtain the initial active current requirement : For reference only. This is the outer ring ratio coefficient; Obtain the initial reactive current requirement : This is the reference value for steady-state reactive current. This is the droop control coefficient. This is the reference value for the grid connection point voltage. This is the actual sampled value of the grid connection point voltage.

8. A computer-readable storage device storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the STATCOM power coordination control method for active power support in a grid-based configuration as described in any one of claims 1 to 7.

9. A grid-based STATCOM power coordination control device for active power support, comprising a storage device, a processor, and a computer program stored in the storage device and executable on the processor, characterized in that, The processor executes the computer program to implement the steps of the STATCOM power coordination control method for active power support in a grid-based system as described in any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the STATCOM power coordination control method for active power support as described in any one of claims 1 to 7.

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