Control method, device and equipment of static synchronous compensator

Abstract

The application provides a control method, device and equipment of a static synchronous compensator, and relates to the technical field of electric power. The method comprises the following steps: acquiring a DC side voltage deviation amount of the static synchronous compensator; inputting the DC side voltage deviation amount into an additional compensation controller composed of a preset proportional link and a preset high-pass link to generate an angular frequency compensation amount; superimposing the angular frequency compensation amount on a basic angular frequency generated by an active control loop of a virtual synchronous generator to obtain a corrected angular frequency; and controlling a converter of the static synchronous compensator based on the corrected angular frequency. The application can improve the stable operation capability of the static synchronous compensator.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to a control method, apparatus, and equipment for a static synchronous condenser. Background Technology

[0002] With the increasing proportion of new energy power generation connected to the grid, the inertia and short-circuit capacity of the power system are continuously decreasing, significantly weakening the system's frequency support and voltage stability capabilities. To improve voltage support and system stability under weak grid conditions, static synchronous condensers (SSCs) are gradually becoming one of the important supporting equipment in new power systems. Compared with traditional synchronous condensers, SSCs have advantages such as fast response speed, flexible control, and low operation and maintenance costs, and can provide voltage support, reactive power compensation, and frequency support for the power grid.

[0003] Currently, the Virtual Synchronous Generator (VSG) is one of the important control methods for static synchronous condensers (SSCs). By simulating the inertia and damping characteristics of a synchronous generator, the VSG enables the SSC to achieve autonomous grid connection and frequency support capabilities. To maintain the stability of the DC-side energy storage unit or DC capacitor voltage, existing SSCs typically introduce a DC voltage control loop on top of the VSG control. This loop generates an active power reference value through DC voltage regulation, achieving coordinated control of DC-side voltage regulation and AC-side frequency support functions. However, DC-side dynamic processes significantly affect the operating performance and stability characteristics of the SSC. When the DC voltage participates in frequency regulation, changes in DC-side energy will couple to the frequency generation stage of the control system, thereby altering the system's dynamic response characteristics. Furthermore, under weak grid conditions, the additional dynamic characteristics introduced by the DC voltage control loop further reduce the system stability margin and increase the risk of low-frequency oscillations. Summary of the Invention

[0004] This invention provides a control method, apparatus, and device for a stationary synchronous condenser to improve the stable operation capability of the stationary synchronous condenser.

[0005] In a first aspect, embodiments of the present invention provide a control method for a static synchronous condenser, wherein the static synchronous condenser adopts a virtual synchronous generator control method that introduces a DC voltage control loop; The control method includes: Obtain the DC-side voltage deviation of the stationary synchronous condenser; The DC-side voltage deviation is input into an additional compensation controller consisting of a preset proportional element and a preset high-pass element to generate an angular frequency compensation amount. The angular frequency compensation is superimposed on the base angular frequency generated by the active power control loop of the virtual synchronous generator to obtain the corrected angular frequency; The stationary synchronous condenser converter is controlled based on the corrected angular frequency.

[0006] In one possible implementation, the transfer function of the additional compensation controller includes: ; in, K 1 represents the gain of the proportional element. K 2 represents the gain of the high-pass circuit. The preset high-pass cutoff frequency, s For the Laplace operator.

[0007] In one possible implementation, the gain of the proportional element... K 1. The equivalent capacitance of the DC voltage control loop is determined so that the equivalent capacitance of the proportional element is a first preset multiple of the equivalent capacitance of the DC voltage control loop.

[0008] In one possible implementation, the gain of the proportional element... K The formula for determining 1 is: ; in, α The first preset multiple, k p This is the proportional coefficient of the DC voltage control loop. D is the damping coefficient in the active power control loop.

[0009] In one possible implementation, the gain of the high-pass circuit... K 2. When the static synchronous condenser is at a preset electromechanical oscillation frequency critical value, the magnitude of the negative resistance of the DC voltage control loop is determined so that the positive resistance compensation amount generated by the high-pass circuit is a second preset multiple of the magnitude of the negative resistance; The critical value of the electromechanical oscillation frequency is the electromechanical oscillation frequency value when the impedance difference between the DC voltage control loop and the stationary synchronous condenser is equal to a preset threshold.

[0010] In one possible implementation, the gain of the high-pass circuit... K The formula for determining 2 is: ; in, β The second preset multiple, k i The integral coefficient of the DC voltage control loop is denoted as . Dis the damping coefficient in the active power control loop. This is the critical value of the electromechanical oscillation frequency.

[0011] In one possible implementation, obtaining the DC-side voltage deviation of the stationary synchronous condenser includes: Obtain the actual DC side voltage of the stationary synchronous condenser; The difference between the actual DC-side voltage and the preset DC-side voltage reference value is calculated to obtain the DC-side voltage deviation.

[0012] In one possible implementation, controlling the stationary synchronous condenser converter based on the corrected angular frequency includes: Obtain the voltage amplitude command output by the reactive power control loop of the virtual synchronous generator; The voltage phase command output by the active power control loop is determined based on the corrected angular frequency. A modulation voltage reference signal is generated based on the voltage phase and the voltage amplitude; A PWM drive pulse is generated based on the modulation voltage reference signal, and the converter of the stationary synchronous condenser is controlled based on the PWM drive pulse.

[0013] Secondly, embodiments of the present invention provide a control device for a static synchronous condenser, wherein the static synchronous condenser adopts a virtual synchronous generator control method that introduces a DC voltage control loop; The control device includes: The acquisition module is used to acquire the DC-side voltage deviation of the stationary synchronous condenser. The accessory control module is used to input the DC side voltage deviation into the additional compensation controller composed of a preset proportional element and a preset high-pass element to generate an angular frequency compensation amount; and to superimpose the angular frequency compensation amount onto the base angular frequency output by the active power control loop of the virtual synchronous generator to obtain the corrected angular frequency. The main control module is used to control the stationary synchronous condenser converter based on the corrected angular frequency.

[0014] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect or any possible implementation thereof.

[0015] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: This invention addresses the control method of a virtual synchronous generator (PSG) incorporating a DC voltage control loop. It uses the DC-side voltage deviation of the static synchronous condenser as input to an additional compensation controller. The additional compensation controller, composed of a proportional converter and a high-pass converter, calculates the angular frequency compensation based on this deviation and adds it to the base angular frequency generated by the active power control loop. The proportional converter generates an equivalent capacitance, which is connected in series with the equivalent capacitance introduced by the DC voltage control loop, effectively reducing the overall capacitive characteristics of the system, decreasing phase lag, and improving phase margin. The high-pass converter introduces an additional positive resistance to the system, offsetting the negative resistance and damping effects of the DC voltage control loop in the low-frequency range, thus suppressing low-frequency oscillations. Furthermore, this additional compensation branch only operates in the low-frequency range and does not alter the original dynamic characteristics of the system in the high-frequency range. It fully preserves the inherent frequency support capability of the virtual synchronous generator, effectively improving the stable operation capability of the static synchronous condenser under weak grid conditions without reducing its frequency support capability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a static synchronous condenser grid connection system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the closed-loop small-signal model of the static synchronous condenser provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the power frequency domain equivalent circuit model provided in the embodiments of the present invention; Figure 4 This is provided by the embodiments of the present invention. Z 1. Z 1+ Z 2 and Z b Bode plot; Figure 5 This is a flowchart illustrating the implementation of the control method for a stationary synchronous condenser provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the additional compensation control provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the equivalent impedance after adding additional control, provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the active power response curve provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the control device for a stationary synchronous condenser provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0017] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0018] To illustrate the technical solution described in this invention, specific embodiments are described below.

[0019] While existing static synchronous condensers can provide voltage support, reactive power compensation, and frequency support, their DC voltage control loop introduces negative resistive-capacitive characteristics, reducing the system's damping level and stability margin. This makes the system more susceptible to low-frequency oscillations or even instability under weak grid conditions. Existing methods lack effective compensation mechanisms for this unfavorable dynamic characteristic, making it difficult to further improve system stability while maintaining frequency support capabilities.

[0020] This invention proposes a control method for a stationary synchronous condenser. This method analyzes the influence mechanism of the DC voltage control loop on the system's dynamic characteristics and constructs an additional compensation branch in the frequency generation stage to specifically compensate for the unfavorable dynamic characteristics introduced. Specifically, a proportional circuit is used to weaken the system's capacitive characteristics, and a high-pass circuit is used to provide positive resistance, thereby improving the system's stability margin and suppressing low-frequency oscillations. This invention effectively improves system stability without reducing frequency support capability.

[0021] Figure 1 This is a schematic diagram of a static synchronous condenser grid-connected system provided as an embodiment of the present invention. See also... Figure 1 As shown: In the main circuit section, the converter of the stationary synchronous condenser is connected to the power grid via transmission lines. Among them, X g and R g These represent the reactance and resistance of the transmission line, respectively. The AC port voltage of the static synchronous condenser is denoted as... V The output active power and reactive power are denoted as follows: P and Q Its DC side is connected to a DC capacitor. C dc Its voltage is denoted as V dc Depending on the specific application scenario, different types of energy sources or energy storage devices can be connected to the downstream end of the DC capacitor. The DC capacitor is used to maintain DC-side voltage stability and provide transient energy support for the dynamic processes of the system.

[0022] The control section mainly consists of an active power control loop, a reactive power control loop, and a DC voltage control loop. Among them, J and D These represent the virtual inertia and damping coefficient in the active control loop, respectively. k q This represents the droop coefficient of the reactive power control loop. k p and k i These represent the proportional coefficient and integral coefficient of the DC voltage control loop, respectively. ω B Represents the reference value of angular frequency. s This represents the Laplace operator. V dcref , P ref , Q ref and V ref These represent reference values ​​for DC voltage, active power, reactive power, and converter port voltage amplitude, respectively. ω B This is the reference value for angular frequency. V g The voltage amplitude of the power grid. S 1 ~S 6 represents the drive signals for the 6 power switching devices of the converter. ω Adjusting the camera voltage for static synchronization V angular frequency ω n The system's rated angular frequency, V n The rated AC voltage amplitude at the grid connection point is the reference value. θ For the phase of the modulated wave, V abc This is the reference signal for the three-phase AC modulated voltage.

[0023] This embodiment first analyzes the mechanism of the negative resistance introduced by the DC voltage control loop: Neglecting line resistance, the active power transmitted by the transmission line can be expressed as: ; in, V Indicates the voltage amplitude at the port of the stationary synchronous camera. Grid voltage amplitude δ Indicates the converter port voltage V With grid voltage The phase angle difference between them is expressed as: ; in, ω and These represent the voltages of the stationary synchronous condenser. V and grid voltage angular frequency.

[0024] Applying small-signal linearization to the above equation near the steady-state operating point, we obtain: ; in, and These represent the steady-state values ​​of the stationary synchronous condenser port voltage and the mains voltage, respectively. This represents the steady-state value of the phase angle difference δ; Δ P Δ ω and These represent the small disturbances of active power, the angular frequency of the stationary synchronous condenser port voltage, and the angular frequency of the grid voltage relative to the steady-state operating point, respectively.

[0025] The dynamic equation for the DC-side capacitor of a stationary synchronous condenser can be expressed as: ; Linearizing the above equation, we get: ; in, This represents the steady-state value of the DC voltage. It represents the small disturbance of DC voltage relative to the steady-state operating point.

[0026] Combining the above formula and Figure 1 The DC voltage control loop and active power control loop shown can be used to obtain the closed-loop small-signal model of the static synchronous condenser, as follows: Figure 2 As shown.

[0027] according to Figure 2 The model shown can represent the dynamic relationship of the stationary synchronous condenser as follows: ; To facilitate the analysis of system stability, we can analogize angular frequency to voltage and active power to current. The above equation can then be further transformed into the corresponding power-frequency domain equivalent circuit model, such as... Figure 3 As shown. Among them, This represents the equivalent impedance of a stationary synchronous camera. This represents the equivalent impedance on the grid side.

[0028] We can obtain: ; It can be seen that the grid-side impedance It exhibits inductive characteristics; while the impedance of a stationary synchronous modulator is... It consists of two parts connected in series. Among them, The impedance introduced by the active power control loop, The impedance introduced by the corresponding DC voltage control loop. For analysis... The impact on the system's dynamic characteristics is analyzed asymptotically. When the frequency is low, an approximate relationship is used. a + bs ≈ a When the frequency is high, an approximate relationship is used. a + bs ≈ bs From this, we can obtain asymptotic expressions for different frequency bands: It can be seen that in the high-frequency band, The DC voltage approaches zero, therefore the DC voltage control loop has a relatively small impact on the system's high-frequency dynamic characteristics; while in the low-frequency range, This manifests as an impedance formed by a second-order element, the real part of which is negative and gradually increases as the frequency decreases, approaching infinity near zero frequency. Therefore, the DC voltage control loop introduces significant negative resistance characteristics into the system at low frequencies, thereby reducing the system's damping level. To further verify the above analysis results, a plot was drawn... , + as well as Bode plot, such as Figure 4 As shown. By Figure 4 It can be seen that in the high-frequency band, + and The near-overlapping impedance indicates that the impedance introduced by the DC voltage control loop primarily affects the low-frequency range. In the low-frequency range, + It exhibits obvious negative resistance and capacitive characteristics, and its phase is relative to Further lag leads to a decrease in system stability margin. When grid strength decreases, the equivalent impedance on the grid side... Equivalent impedance of converter side The intersection of the amplitude-frequency curves shifts to lower frequencies, encroaching on the frequency band dominated by negative resistance, leading to insufficient phase margin or even negative damping in the system, inducing low-frequency oscillations. In other words, the main reason for the decreased stability of the stationary synchronous condenser is the impedance introduced by the DC voltage control loop. It exhibits negative resistivity and capacitive characteristics. The capacitive characteristic increases system phase lag and reduces system phase margin; the negative resistivity weakens system damping and increases the risk of system instability.

[0029] To address the aforementioned problems, embodiments of the present invention introduce an additional control loop based on the original control structure, by constructing a new additional impedance. ,right The introduced unfavorable dynamic characteristics are compensated for in a targeted manner. This is achieved through the construction of a control system that allows... It exhibits positive resistivity and capacitance. Since capacitors connected in series will decrease the capacitance, therefore... The capacitive part is used to weaken The introduced capacitive characteristics reduce system phase lag; and The positive resistance part is used for compensation. The introduced negative resistance characteristic improves the system's damping level and reduces the risk of instability. Based on this design concept, please refer to [further details omitted]. Figures 5-7 The control method for a stationary synchronous condenser provided in an embodiment of the present invention will be described below: Step S101: Obtain the DC side voltage deviation of the stationary synchronous condenser.

[0030] This embodiment acquires the actual DC side voltage of a stationary synchronous condenser. V dc Then calculate the actual DC side voltage. V dc Compared with the preset DC side voltage reference value V dcref The difference is used to obtain the DC side voltage deviation: V dc -V dcref .

[0031] Step S102: Input the DC side voltage deviation into the additional compensation controller composed of a preset proportional element and a preset high-pass element to generate the angular frequency compensation.

[0032] In this embodiment, the transfer function of the additional compensation controller is: ; in, K 1 represents the gain of the proportional element. K 2 represents the gain of the high-pass filter. The preset high-pass cutoff frequency, s For the Laplace operator.

[0033] like Figure 6 As shown, in this embodiment, the additional compensation controller... G x ( V dc -V dcref Generate angular frequency correction amount And superimposed on the frequency generation stage.

[0034] The closed-loop small-signal model after adding additional control, such as Figure 7 As shown. According to Figure 7The equivalent impedance of the stationary synchronous condenser after adding additional control can be further obtained. Za for: ; As can be seen from the above equation, the additional control loop introduces a new additional impedance. Further analysis reveals that due to impedance for Gx Multiply by DC capacitor impedance ,therefore It will consist of two parts, in which the proportioning process will become... It exhibits capacitive characteristics; the Qualcomm cascade stage will become... It exhibits as a positive resistance. With cutoff frequency ωL The structure of the low-pass circuit combination.

[0035] The above structure is adopted mainly based on the following two considerations: First, the high-frequency dynamic characteristics of the system remain essentially unchanged. Since stability issues are mainly concentrated in the low-frequency range, the additional control only applies to the low-frequency range, thus avoiding significant impact on the original high-frequency dynamic characteristics of the stationary synchronous condenser.

[0036] Secondly, it improves the engineering feasibility of the controller. Directly constructing an ideal differential element to achieve positive resistance compensation can easily amplify high-frequency noise and reduce the robustness of the control system. Using a high-pass structure, the desired compensation effect can be achieved while suppressing high-frequency noise, thus improving the feasibility of engineering applications.

[0037] Step S103: The angular frequency compensation is superimposed on the base angular frequency generated by the active power control loop of the virtual synchronous generator to obtain the corrected angular frequency.

[0038] like Figure 6 As shown, the angular frequency compensation amount is After being superimposed on the fundamental angular frequency generated by the active power control loop of the virtual synchronous generator, the corrected angular frequency is obtained as follows: .

[0039] Step S104: Control the stationary synchronous condenser converter based on the corrected angular frequency.

[0040] Combination Figure 1 and Figure 6 As shown, the voltage amplitude command output by the reactive power control loop of the virtual synchronous generator is... V ref According to the corrected angular frequency The voltage phase command output by the active power control loop is obtained through integration. θ A modulated voltage reference signal is generated based on voltage phase and voltage amplitude. Vabc ;according to V abc PWM drive pulses are generated to control the converter of the stationary synchronous condenser.

[0041] In the above embodiments, an additional control loop for enhancing the stability of the stationary synchronous condenser has been constructed. This control loop includes three parameters to be designed, namely the gain of the proportional element. K 1. High-pass filter gain K 2 and Qualcomm cutoff frequency ω L The design methods for each parameter are given below.

[0042] In one embodiment, the cutoff frequency of the high-pass circuit is first... ω L The design is then carried out. The high-pass circuit is essentially used to construct low-frequency positive resistance compensation, ensuring that the additional control primarily operates within the system's low-frequency dynamic range. For a stationary synchronous condenser, the oscillations caused by the outer loop dynamics are typically concentrated below 10Hz. ω L It should be higher than the target oscillation frequency band, while avoiding affecting the high-frequency dynamic characteristics of the system. Taking into account both control effectiveness and engineering implementation requirements, it can be... ω L Set to 20π rad / s.

[0043] In one embodiment, for the gain of the proportional element K 1. Its function is to weaken the capacitive characteristics introduced by the DC voltage control loop. The equivalent capacitance corresponding to the DC voltage control loop is... To reduce the overall capacitive characteristics of the system and improve the system phase margin, the equivalent capacitance introduced by the additional control is set to be a fraction of the equivalent capacitance. α The effective capacitance of the two capacitors connected in series decreases, thus reducing the overall capacitive capacitance of the system by approximately [number missing]. α / ( α +1) times. Therefore: ; Further, the gain of the proportional element can be obtained. K 1 is: ; For example α When =1, the capacitive capacitance introduced by the DC loop decreases by 50%, which can reach K 1 = 0.004.

[0044] In one embodiment, for the high-pass gain K 2. Its function is to compensate for the negative resistance introduced by the DC voltage control loop. At the oscillation frequency... ωAt position 0, the magnitude of the negative resistance introduced by the DC voltage control loop is: .Depend on Figure 4 It can be seen that when the frequency is below 0.5Hz, the negative resistance characteristic begins to gradually appear and increases continuously as the frequency decreases. Therefore, the following can be selected: ω 0 = π rad / s is used as the design frequency point. This frequency corresponds to the low-frequency oscillation region around 0.5 Hz, which can reflect the dynamic characteristics when the negative resistance begins to appear significantly. To weaken the negative resistance effect and improve the system damping level, the positive resistance compensation generated by the additional control is set to be a fraction of the negative resistance. β times, that is: ; Therefore, the gain of the high-pass circuit can be obtained. K 2 is: ; For example β When the resistance is 0.5, the negative resistance introduced by the DC loop decreases by 50%, which yields... K 2 = 0.057.

[0045] Using the design methods described above, we can determine the following respectively: ω L , K 1 and K The possible values ​​of 2. Among them, K 1. Primarily used to reduce the capacitive characteristics of the system and improve the phase margin; K 2. Primarily used to compensate for negative resistance characteristics and improve the system damping level; ω L This is used to limit the scope of the compensation, so that the proposed control strategy only applies to the low-frequency band, thereby avoiding a significant impact on the original high-frequency dynamic characteristics of the system.

[0046] To verify the effectiveness of this method in improving the stability of static synchronous condensers and its ability to suppress instability risks, this embodiment constructs a static synchronous condenser grid-connected system for simulation verification.

[0047] In this embodiment, a 0.01Hz frequency drop disturbance is applied when the system has been running for 6 seconds. The results show that after introducing additional control, the system oscillation amplitude is significantly reduced, and the dynamic recovery time is significantly shortened. Only when... K With a 1:1 ratio compensation, the system's capacitive characteristics are weakened, thus improving system stability to some extent; only when the ratio is 1:1... K 2. With high-pass compensation, the system damping level is improved due to the compensation of negative resistance characteristics. When K 1 and K When both compensations are applied simultaneously, the two compensation effects work together, further improving the dynamic performance of the system and demonstrating the best stability enhancement effect.

[0048] To verify the ability of the proposed control strategy to reduce the risk of system instability, this embodiment increases the line inductance to 1.5 pu, thereby constructing extremely weak power grid operating conditions.

[0049] The additional control is engaged at the start of the simulation, deactivated after 5 seconds, and re-engaged after 15 seconds. Figure 8 The corresponding active power response curves are given.

[0050] Depend on Figure 8 It can be seen that under extremely weak power grid conditions, when the additional control is removed, the system oscillation amplitude continues to increase and gradually tends to become unstable; when the additional control is reinstated, the system oscillation rapidly decays and returns to a stable operating state. This result shows that the proposed additional control can effectively compensate for the adverse dynamic characteristics introduced by the DC voltage control loop, significantly improve the system stability margin, reduce the risk of system instability, and extend the stable operating range of the static synchronous condenser under weak power grid conditions.

[0051] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0052] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0053] Figure 9 A schematic diagram of the control device for a stationary synchronous condenser provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below: like Figure 9 As shown, the control device 9 for the stationary synchronous condenser includes: The acquisition module 91 is used to acquire the DC side voltage deviation of the stationary synchronous condenser; The accessory control module 92 is used to input the DC side voltage deviation into the additional compensation controller composed of a preset proportional element and a preset high-pass element to generate the angular frequency compensation amount; and to superimpose the angular frequency compensation amount onto the basic angular frequency output by the active power control loop of the virtual synchronous generator to obtain the corrected angular frequency. The main control module 93 is used to control the stationary synchronous condenser converter based on the corrected angular frequency.

[0054] Figure 10 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. For example... Figure 10As shown, the electronic device 10 of this embodiment includes a processor 100 and a memory 101. The memory 101 stores a computer program 102. When the processor 100 executes the computer program 102, it implements the steps in the various method embodiments described above. Alternatively, when the processor 100 executes the computer program 102, it implements the functions of each module / unit in the various device embodiments described above.

[0055] For example, computer program 102 may be divided into one or more modules / units, which are stored in memory 101 and executed by processor 100 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 102 in electronic device 10.

[0056] Electronic device 10 may include, but is not limited to, processor 100 and memory 101. Those skilled in the art will understand that... Figure 10 This is merely an example of electronic device 10 and does not constitute a limitation on electronic device 10. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 10 may also include input / output devices, network access devices, buses, etc.

[0057] For the sake of simplicity and clarity, only the above-described functional modules / units are used as examples. In practical applications, the functions described above can be assigned to different functional modules / units as needed. These modules / units can be implemented in hardware, software, or a combination of both.

[0058] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method for a stationary synchronous camera, characterized in that, The stationary synchronous condenser adopts a virtual synchronous generator control method that introduces a DC voltage control loop; The control method includes: Obtain the DC-side voltage deviation of the stationary synchronous condenser; The DC-side voltage deviation is input into an additional compensation controller consisting of a preset proportional element and a preset high-pass element to generate an angular frequency compensation amount. The angular frequency compensation is superimposed on the base angular frequency generated by the active power control loop of the virtual synchronous generator to obtain the corrected angular frequency; The stationary synchronous condenser converter is controlled based on the corrected angular frequency.

2. The control method for a stationary synchronous condenser according to claim 1, characterized in that, The transfer function of the additional compensation controller includes: ； in, K 1 represents the gain of the proportional element. K 2 represents the gain of the high-pass circuit. The preset high-pass cutoff frequency, s For the Laplace operator.

3. The control method for a stationary synchronous camera according to claim 2, characterized in that, The gain of the proportional element K 1. The equivalent capacitance of the DC voltage control loop is determined so that the equivalent capacitance of the proportional element is a first preset multiple of the equivalent capacitance of the DC voltage control loop.

4. The control method for a stationary synchronous camera according to claim 3, characterized in that, The gain of the proportional element K The formula for determining 1 is: ； in, α The first preset multiple, k p This is the proportional coefficient of the DC voltage control loop. D is the damping coefficient in the active power control loop.

5. The control method for a stationary synchronous camera according to claim 2, characterized in that, The gain of the high-pass circuit K 2. When the static synchronous condenser is at a preset electromechanical oscillation frequency critical value, the magnitude of the negative resistance of the DC voltage control loop is determined so that the positive resistance compensation amount generated by the high-pass circuit is a second preset multiple of the magnitude of the negative resistance; The critical value of the electromechanical oscillation frequency is the electromechanical oscillation frequency value when the impedance difference between the DC voltage control loop and the stationary synchronous condenser is equal to a preset threshold.

6. The control method for a stationary synchronous camera according to claim 5, characterized in that, The gain of the high-pass circuit K The formula for determining 2 is: ； in, β The second preset multiple, k i The integral coefficient of the DC voltage control loop is denoted as . D is the damping coefficient in the active power control loop. This is the critical value of the electromechanical oscillation frequency.

7. The control method for a stationary synchronous condenser according to any one of claims 1-6, characterized in that, The process of obtaining the DC-side voltage deviation of the stationary synchronous condenser includes: Obtain the actual DC side voltage of the stationary synchronous condenser; The difference between the actual DC-side voltage and the preset DC-side voltage reference value is calculated to obtain the DC-side voltage deviation.

8. The control method for a stationary synchronous condenser according to any one of claims 1-6, characterized in that, The control of the stationary synchronous condenser converter based on the corrected angular frequency includes: Obtain the voltage amplitude command output by the reactive power control loop of the virtual synchronous generator; The voltage phase command output by the active power control loop is determined based on the corrected angular frequency. A modulation voltage reference signal is generated based on the voltage phase and the voltage amplitude; A PWM drive pulse is generated based on the modulation voltage reference signal, and the converter of the stationary synchronous condenser is controlled based on the PWM drive pulse.

9. A control device for a stationary synchronous camera, characterized in that, The stationary synchronous condenser adopts a virtual synchronous generator control method that introduces a DC voltage control loop; The control device includes: The acquisition module is used to acquire the DC-side voltage deviation of the stationary synchronous condenser. The accessory control module is used to input the DC side voltage deviation into the additional compensation controller composed of a preset proportional element and a preset high-pass element to generate an angular frequency compensation amount; and to superimpose the angular frequency compensation amount onto the base angular frequency output by the active power control loop of the virtual synchronous generator to obtain the corrected angular frequency. The main control module is used to control the stationary synchronous condenser converter based on the corrected angular frequency.

10. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1 to 8.

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