Power station simulation test system and power station simulation test method

Abstract

The invention relates to the technical field of power station testing, and discloses a power station simulation testing system and a power station simulation testing method. A power station test model of a to-be-tested power station is constructed in a simulation server, wherein the power station test model comprises a power grid model, a network-following type equipment simulation model and a network-constructing type equipment simulation model; different operation condition instructions are sent to the power station test model through a network construction type equipment controller and a coordination controller, and the power station test model is controlled to enter different operation conditions; and under different operation conditions, observing the electric energy quality of a grid-connected point in the power grid model, and determining whether the to-be-tested power station has power grid strength adaptability according to the electric energy quality. Different working condition instructions are sent to the power station test model by using the real networking type equipment controller and the coordination controller, and simulation tests are carried out for different operation working conditions, so that the simulation authenticity and accuracy are improved on the premise of ensuring the overall simulation precision.

Description

Technical Field

[0001] This application relates to the field of power plant testing technology, and in particular to a power plant simulation testing system and a power plant simulation testing method. Background Technology

[0002] Current simulation methods typically use simulation software to model components such as power grid circuits and loads. However, the parameters of these devices are derived from ideal models and cannot fully match the actual conditions.

[0003] Furthermore, since the model is run in software, it cannot accurately reflect the existence of influencing factors such as control signal transmission lag, and the simulation results will deviate from the actual situation to a certain extent, thus affecting the realism and accuracy of the simulation. Summary of the Invention

[0004] The purpose of this application is to provide a power plant simulation testing system and a power plant simulation testing method to improve the realism and accuracy of the simulation.

[0005] To address the aforementioned technical problems, embodiments of this application provide a power plant simulation testing system, comprising: a simulation server, the simulation server including a power plant test model, the power plant test model including a power grid model, a grid-connected equipment simulation model, and a grid-building equipment simulation model, the grid-connected equipment simulation model and the grid-building equipment simulation model being connected to the power grid model via a power plant bus model; a grid-building equipment controller, the grid-building equipment controller being communicatively connected to the grid-building equipment simulation model; and a coordination controller, the coordination controller being communicatively connected to the grid-building equipment controller, the power grid model, and the grid-connected equipment simulation model.

[0006] The embodiments of this application also provide a power plant simulation testing method, the method comprising: constructing a power plant test model of the power plant under test on a simulation server, the power plant test model comprising: a power grid model, a grid-connected equipment simulation model, and a grid-connected equipment simulation model; sending different operating condition commands to the power plant test model through a grid-connected equipment controller and a coordination controller to control the power plant test model to enter different operating conditions; observing the power quality at the grid connection point in the power grid model under different operating conditions, and determining whether the power plant under test has grid strength adaptability based on the power quality.

[0007] Compared with the prior art, this application provides a power plant simulation testing system and method. It constructs a power plant test model comprising a power grid model, a grid-connected equipment simulation model, and a grid-connected equipment simulation model. Each equipment simulation model is connected to a real grid-connected equipment controller and a real coordination controller via interfaces. During simulation, the coordination controller communicates with the real grid-connected equipment controller and the grid-connected equipment virtual controller to regulate the different operating condition command rates sent by each equipment simulation model to the power plant test model. This controls the power plant test model to enter different operating conditions, and under different operating conditions, the power quality at the grid connection point in the power grid model is observed. Based on the power quality, it is determined whether the power plant under test possesses grid strength adaptability. This simulation testing system and method effectively avoid problems such as control signal transmission lag, inaccurate simulation, and deviations between simulation results and actual conditions that may exist when a virtual controller is simulated alone, effectively improving the realism and accuracy of the simulation. Attached Figure Description

[0008] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0009] Figure 1 This is a schematic diagram of the structure of a power plant simulation test system according to an embodiment of this application;

[0010] Figure 2 This is a schematic diagram of the structure of a hardware-in-the-loop simulation system for a grid-connected power plant and a grid-linked power plant according to an embodiment of this application;

[0011] Figure 3 This is a flowchart of a power plant simulation test method provided according to an embodiment of this application. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the various embodiments of the present invention to facilitate a better understanding of this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with and referenced by each other without contradiction.

[0013] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0014] Current simulation methods typically use simulation software to model components such as power grid circuits and loads. However, the parameters of these components are derived from ideal models and cannot fully match the actual conditions. Furthermore, because the models are run in software, they cannot accurately reflect the existence of influencing factors such as control signal transmission lag, resulting in simulation results that deviate from reality and thus affecting the realism and accuracy of the simulation. This application provides a power plant simulation testing system according to one embodiment.

[0015] The power plant simulation testing system provided in this application includes a simulation server running a simulation model, a grid-type equipment controller, and a coordination controller. This power plant simulation testing system uses a real controller and a virtual simulation model to achieve cost-effective and highly realistic simulation of power plant operating scenarios, ultimately serving as a hardware-in-the-loop simulation test for grid strength adaptability. It can improve the realism and accuracy of the simulation while ensuring overall simulation accuracy.

[0016] Figure 1 This is an exemplary structural diagram of a power plant simulation test system provided according to an embodiment of this application; Figure 2 This is an exemplary structural diagram of a hardware-in-the-loop simulation system for a grid-connected power plant and a grid-linked power plant provided according to an embodiment of this application.

[0017] like Figure 1 and Figure 2As shown, the power plant simulation testing system of this application embodiment mainly includes a simulation server, a grid-type equipment controller, and a coordination controller. The simulation server also includes a power plant test model, which comprises a power grid model, a grid-connected equipment simulation model, and a grid-connected equipment simulation model. The grid-connected equipment simulation model and the grid-connected equipment simulation model are connected to the power grid model through a power plant bus model. The grid-connected equipment controller is communicatively connected to the grid-connected equipment simulation model. The coordination controller is communicatively connected to the grid-connected equipment controller, the power grid model, and the grid-connected equipment simulation model. Through the collaboration of the "simulation model + real controller + coordination center," the various devices achieve high-performance, high-fidelity simulation of the operating scenarios of grid-connected and grid-connected power plants, ultimately serving as a semi-physical simulation test for power grid strength adaptability.

[0018] The power grid model simulates the electrical characteristics (voltage, frequency, impedance, etc.) of a real three-phase power grid, as well as power grid environments of varying intensities (e.g., weak and strong grids). The grid-connected equipment simulation model is a CPU-based, large-step, fully digital simulation model. This model directly utilizes encapsulated controller source code and circuit topology parameters, accurately simulating the operating characteristics of grid-connected equipment. The network-building equipment simulation model is an FPGA-based, small-step, semi-physical simulation circuit model. Both the grid-connected and network-building equipment simulation models are interconnected with the real controller via hardware interfaces, achieving "semi-physical" simulation that more closely resembles the physical operating characteristics of field equipment. The power grid model, grid-connected equipment simulation model, and network-building equipment simulation model are connected via a power plant busbar model, simulating the electrical connection relationships of grid-connected and network-building equipment connected to the power grid via the collecting busbar in an actual power plant, thus constructing a highly realistic power plant operation scenario.

[0019] The network-type device controller is a real physical controller that interconnects with the network-type device simulation model in the simulation server via I / O interfaces. It is responsible for real-time control of the network-type device's operating status (such as power output and voltage / frequency response). Its role is to replace the virtual controller, accurately reflecting the control logic and dynamic response characteristics of the network-type device through "semi-physical" interaction ("real controller + simulation model"), avoiding problems such as control signal hysteresis and response deviation in pure digital simulation, and improving the simulation realism.

[0020] The coordinating controller is the "control center" of the system. It is interconnected with the grid-type equipment controller and the grid-following equipment simulation model through communication. Its main functions include: uniformly setting the operating power of the grid-following equipment and the grid-type equipment; coordinating the adjustment of the grid strength; and realizing flexible control of the operating status of the entire power plant simulation system. It provides control support for testing the adaptability of the power plant under different power and grid strength (such as power quality at the PCC point), and is the key to achieving highly flexible testing.

[0021] In some embodiments, the power grid model includes a three-phase power grid model and a main power station transformer model connected in series; the main power station transformer model is connected to the grid-connected equipment simulation model and the grid-structured equipment simulation model through the power station bus model and the feeder model.

[0022] The three-phase power grid model simulates the electrical environment of a real power grid (voltage, frequency, impedance, etc.), while the main power station transformer model simulates the step-up transformer of an actual power station, connecting the power grid to the internal busbars of the power station and recreating the voltage level conversion process. Both the three-phase power grid model and the main power station transformer model include a PCC (point of common coupling) to observe key indicators (such as total harmonic distortion and voltage fluctuation) to assess the power station's adaptability to power grid strength.

[0023] In this system, the outputs of all grid-connected and network-structured equipment are collected at the busbar via feeders, and then connected to the power grid via the main transformer. Specifically, the grid-connected equipment model and the network-structured equipment model are respectively collected at the power station busbar model via their respective feeders, and then connected to the power grid uniformly via the main transformer. Through this connection, the simulation system can realistically simulate the process of equipment output power, voltage, and other signals being transmitted to the power grid via feeders, busbars, and transformers, providing an electrical signal transmission path that conforms to actual physical laws and ensuring a high degree of consistency between the simulation scenario and the actual on-site operating scenario.

[0024] In some embodiments, there can be multiple simulation models of mesh-type devices, and multiple mesh-type device simulation models are connected to a mesh-type feeder model; there can also be multiple simulation models of network-type devices, and multiple network-type device simulation models are connected to a network-type feeder model.

[0025] Please see Figure 2Each feeder can be connected in parallel to K fully digital simulation models of grid-connected power electronic equipment. For example, the i-th grid-connected feeder can be connected to the i(j)-th fully digital simulation model of grid-connected power electronic equipment based on CPU large-step simulation (j = 1, 2, 3...K). Each feeder can be connected in parallel to H grid-type power electronic equipment circuit models (such as grid-type energy storage, virtual synchronous machines). For example, the a-th grid-type feeder can be connected to the a(b)-th grid-type power electronic equipment circuit model based on FPGA small-step simulation (b = 1, 2, 3...H), where K and H are both positive integers. In other words, a grid-connected feeder model can be connected in parallel to K grid-connected device simulation models, and a grid-connected feeder model can be connected in parallel to H grid-connected device simulation models. This design simulates and recreates the electrical topology of a real power plant where "multiple similar devices converge through the same feeder" (for example, in an actual power plant, multiple photovoltaic inverters may be connected to the collection bus through the same grid-connected feeder, and multiple grid-connected energy storage devices may be connected to the collection bus through the same grid-connected feeder). This design can more realistically simulate actual scenarios such as device power aggregation, feeder impedance effects, and electrical coupling between multiple devices, providing a simulation environment that conforms to the physical laws of the field for subsequent testing, ensuring the authenticity and validity of the test results.

[0026] In some embodiments, there are multiple network device controllers, and each network device controller is connected to a multiple network device simulation model.

[0027] Please see Figure 2This design establishes a one-to-one matching relationship between the grid-type equipment controller and the grid-type equipment simulation model. Each grid-type equipment simulation model (such as the circuit model of a grid-type energy storage device) requires a corresponding real grid-type equipment controller to implement the control logic (such as voltage / frequency support and power regulation). When there are multiple grid-type equipment simulation models in the system (such as multiple grid-type devices connected to multiple grid-type feeders), each model needs to be configured with an independent grid-type equipment controller, forming a one-to-one connection of "one controller corresponding to one simulation model". This design reproduces the control scenario of a real power plant: each grid-type device in the field (such as each energy storage converter) has an independent controller, rather than multiple devices sharing a single controller, ensuring the independence and accuracy of the control signals. In addition, the core characteristic of grid-type equipment is its active participation in grid regulation (such as providing virtual inertia and voltage support), and its control logic is complex and has extremely high real-time requirements. If multiple simulation models share a single controller, it will lead to control signal delays and cross-interference, making it impossible to realistically simulate the dynamic response of multiple devices operating in parallel (such as the coordinated process of multiple network-type devices participating in frequency regulation simultaneously). In general, the essence of this design is to ensure that multiple network-type devices can operate independently and be coordinated in the simulation system as in an actual power plant through "one-to-one hardware-model matching", ultimately improving the realism of the hardware-in-the-loop simulation and the credibility of the test results.

[0028] In the power plant simulation testing system provided in this application embodiment, the grid-connected equipment simulation model is efficiently simulated by the CPU, while the network-connected equipment simulation model relies on FPGA + real controller to enhance realism. The coordination controller performs unified scheduling, ultimately achieving low-cost and highly flexible simulation testing. Through the collaboration of "simulation model + real controller + coordination center", high-performance and high-fidelity simulation of network-connected and grid-connected power plant operation scenarios is achieved, ultimately serving the semi-physical simulation testing of power grid intensity adaptability.

[0029] To avoid the high risks and costs of field testing and to achieve high cost-effectiveness and high flexibility in grid-connected and grid-linked power plant grid strength adaptability testing, another embodiment of this application provides a power plant simulation testing method, specifically used for the simulation testing of power plant grid strength adaptability, in order to overcome the problems of high cost and high risk of field testing. Figure 3 A flowchart of a simulation test method for the power grid intensity adaptability of a power plant is given, such as... Figure 3 As shown, the simulation test method for this power station includes the following steps.

[0030] Step 310: Construct a power plant test model of the power plant under test on the simulation server. The power plant test model includes: a power grid model, a grid-connected equipment simulation model, and a grid-connected equipment simulation model.

[0031] Step 320: Send different operating condition commands to the power plant test model through the network-type equipment controller and the coordination controller to control the power plant test model to enter different operating conditions.

[0032] Step 330: Under different operating conditions, observe the power quality at the grid connection point in the power grid model, and determine whether the power station under test has the ability to adapt to grid intensity based on the power quality.

[0033] By simulating the real operating scenario of a power station connected to the grid, and further simulating different extreme operating conditions and observing power quality, the adaptability of the power station to the grid intensity is determined. In a low-cost and highly flexible way, it is possible to determine whether the power station can operate stably under different grid intensities, thus solving practical testing problems.

[0034] In step 310, the constructed power plant test model includes a power grid model, a grid-connected equipment simulation model, and a grid-connected equipment simulation model. The power grid model simulates the electrical environment (voltage, frequency, impedance, etc.) of a real power grid, representing the "external scenario" to which the power plant connects. For example, by setting equivalent impedance, it can simulate weak grid (low short-circuit ratio) and strong grid (high short-circuit ratio) environments, preparing for subsequent testing of different grid strengths. The grid-connected equipment simulation model is a CPU-based, large-step, fully digital simulation model used to efficiently simulate "grid-following" operations such as photovoltaic and wind power. It can simulate large-scale scenarios with N grid-connected feeders and multiple devices connected in parallel on each feeder, solving the problem of insufficient laboratory testing capacity. The grid-connected equipment simulation model is an FPGA-based, small-step, semi-physical simulation model, paired with a real controller, accurately reproducing the circuit dynamics and control logic of "actively supporting the power grid" equipment such as energy storage, compensating for the shortcomings of pure digital simulation in hardware details (such as signal delay and engineering implementation of control algorithms). The power grid model, the grid-connected equipment simulation model, and the network-building equipment simulation model are connected through the power station bus model to restore the electrical topology of the actual power station, making the simulation scenario closer to reality.

[0035] In step 320, the grid-type equipment controller, as the actual control core of the grid-type equipment, sends commands to directly regulate the operating state of the grid-type equipment simulation model (such as power output and control strategy switching), making the simulation response of the grid-type equipment closer to the physical hardware. The coordination controller, on the one hand, coordinates with the grid-type equipment controller, and on the other hand, directly controls the grid-type equipment simulation model to realize power regulation and grid intensity simulation.

[0036] In some embodiments, the operating condition command includes equipment power command and grid impedance command. The equipment power command is used to set the operating power of the grid-connected equipment simulation model and the grid-following equipment simulation model to simulate the operation process of the power plant from low load to full power generation. The grid impedance command is used to change the equivalent impedance of the grid model, so that the short-circuit ratio Kscr changes stepwise (e.g., from Kscr=i to Kscr=j), to reproduce the extreme scenario of sudden change in grid strength (weak grid → strong grid or vice versa), which is difficult to achieve in field tests at low cost.

[0037] In some embodiments, the power plant test model is controlled to enter different operating conditions by sending different operating condition commands to the power plant test model through the network-type equipment controller and the coordination controller. This can be achieved in the following way: the coordination controller sends different equipment power commands to the grid-connected equipment simulation model; the network-type equipment controller obtains the different equipment power commands sent by the coordination controller and forwards the equipment power commands to the network-connected equipment simulation model; wherein the grid-connected equipment simulation model and the network-type equipment simulation model respond to the equipment power commands and adjust their own operating power.

[0038] Specifically, the coordination controller generates unified device power commands based on test requirements, avoiding conflicts between multiple controller commands. The coordination controller then uses a simulation model specific to each network-connected device (i.e.,...) Figure 2 The "simulation model of grid-connected power electronic equipment" in the text, and the simulation model for each grid-connected device (i.e. Figure 2 The "grid-type power electronic equipment controller" in the system is set with a corresponding operating power P(c), which is set as follows: P(c) = c * 10% of rated equipment power, where c is the power gradient coefficient, with an initial value of 1 and a value ranging from 1 to 11. The grid-type equipment simulation model directly receives instructions and adjusts the operating power (e.g., the power generation power of photovoltaic / wind turbines) based on large-step simulation using the CPU. The grid-type equipment controller acts as a "relay station," first receiving instructions from the coordination controller and then forwarding them to the grid-type equipment simulation model, using "real hardware + FPGA circuit model" to adjust the power (e.g., the charging and discharging power of energy storage). In summary, this process, through the unified scheduling and hierarchical instruction forwarding design of the coordination controller, utilizes both the efficient cluster simulation of fully digital simulation and the hardware closed-loop authenticity of semi-physical simulation, ultimately achieving the testing objective of accurately reproducing the full power operating conditions of the power station and observing the grid strength adaptability.

[0039] In some embodiments, different operating condition commands are sent to the power plant test model through the grid-type device controller and the coordination controller to control the power plant test model to enter different operating conditions. The method also includes the following specific implementation: different grid impedance commands are sent to the three-phase grid model through the coordination controller, and the three-phase grid model responds to the grid impedance commands and changes its own equivalent impedance amplitude.

[0040] Specifically, the coordinating controller sets the magnitude of the equivalent impedance Z of the three-phase power grid, |Z(i)|, to a step value of |Z(j)|, (j = 1, 2, 3...10, and j ≠ i) via a power grid impedance command; where |Z(i)| = Un 2 / (Kscr(i)×Pn), where Un is the rated voltage (line voltage) of the three-phase power grid, Pn is the rated active power of the tested power station, and Kscr(i) is the short-circuit ratio. Here, Kscr(i) is arbitrarily set to i, where i is an integer between 1 and 10. Therefore, the larger i is, the larger Kscr is, and the smaller |Z(i)| is, the stronger the power grid is.

[0041] In actual power plant operation, the grid strength may change drastically due to sudden events such as line faults and load surges (e.g., a sudden shift from a strong to a weak grid), posing a significant challenge to the adaptability of grid-based equipment. The power plant simulation testing method in this application simulates sudden changes in grid strength (short-circuit ratio) by "setting |Z(i)| to |Z(j)|," which essentially means "instantly switching the equivalent impedance of the grid from the corresponding Kscr=i value to the corresponding Kscr=j value in the simulation." This design ensures the uniformity and accuracy of grid operating condition regulation, consistent with the logic of "unified control of grid parameters by the dispatch center" in actual power plants.

[0042] In step 330, the grid connection point (PCC point) is the common node connecting the power plant to the power grid. Its power quality (total harmonic distortion, voltage fluctuations, and flicker, etc.) directly reflects the power plant's impact on and adaptability to the power grid. For example, if the total harmonic distortion exceeds 5%, it indicates that the power plant will pollute the power grid under that operating condition and lacks adaptability. Under different operating conditions (different power, different grid strength), if the power quality of all operating conditions meets the standards (e.g., total harmonic distortion ≤ 5%), and the power and grid strength stepped tests can be completed, then it is determined to have adaptability; if any operating condition does not meet the standards, it is determined to lack adaptability, ensuring that the test results can guide the actual application of the power plant.

[0043] In some embodiments, different operating conditions include multiple operating power levels and multiple equivalent impedance amplitudes. Under different operating conditions, the power quality at the grid connection point in the power grid model is observed, and the power quality is used to determine whether the power station under test has grid strength adaptability. This includes: for each operating power level, performing a step adjustment on the equivalent impedance amplitude of the three-phase power grid model, wherein the step adjustment traverses multiple equivalent impedance amplitudes; after each step adjustment, the power quality at the grid connection point in the power grid model is observed, and the power quality is used to determine whether the power station under test has grid strength adaptability. If the power quality meets preset conditions under all operating power levels and during all step adjustments of equivalent impedance amplitudes, then the power station under test is determined to have grid strength adaptability.

[0044] Multiple operating power settings are configured as c × 10% of the rated power (where c is an integer from 1 to 11), covering the full power range of the power station from 10% underload to 110% overload (e.g., c = 1 corresponds to 10% rated power, c = 10 corresponds to 100% rated power). Multiple equivalent impedance values ​​correspond to different short-circuit ratios Kscr(i) = i (where i is an integer from 1 to 10). Impedance is inversely proportional to the short-circuit ratio (the smaller Kscr is, the larger the impedance, and the weaker the grid), covering the full strength range from "extremely weak grid" (Kscr = 1) to "strong grid" (Kscr = 10). The essence of this design is to simulate real-world scenarios where the power station encounters different grid strengths under various load conditions (e.g., connecting to a weak grid under low load and a strong grid under full power generation), ensuring that the test covers all possible extreme operating conditions.

[0045] The specific process for performing step adjustments on the equivalent impedance of the power grid for each operating power is as follows: First, set an operating power (e.g., c=1, i.e., 10% of rated power); then perform a "step adjustment" on the equivalent impedance of the power grid (i.e., adjust from Kscr=1 to Kscr=10, simulating a sudden change in power grid strength). After each "step adjustment," observe the power quality (e.g., total harmonic distortion rate, voltage fluctuation) at the grid connection point (PCC point). When the equivalent impedance of the power grid is adjusted to its maximum value, adjust the operating power again. Under the adjusted operating power, perform a "step adjustment" on the equivalent impedance of the power grid (i.e., adjust from Kscr=1 to Kscr=10, simulating a sudden change in power grid strength). In other words, the test of "traversing all Kscr steps" is repeated for each power, forming a full-scenario coverage. This "step adjustment" simulates extreme situations of sudden changes in power grid strength (e.g., a sudden weakening of the power grid due to a line fault), and is a key means of testing the dynamic adaptability of the power station.

[0046] If, after a certain step change, all power quality indicators at the PCC point (such as total harmonic distortion ≤ 5% and voltage deviation within the allowable range) meet the standards, it indicates that the power station can adapt to changes in grid strength under that operating condition. If the power quality fails to meet the standards under any operating condition (a certain power + a certain Kscr step change), the power station is deemed to lack the corresponding grid strength adaptability. Only when the power quality meets the standards under all operating conditions, and the power can increase from c = 1 to c > 10 (i.e., completing the 100% rated power test), is the power station deemed to have comprehensive grid strength adaptability. In this way, through the "variable controllability" of the simulation system, all scenarios can be traversed at low cost, and the authenticity of the test can be guaranteed through "semi-physical closed loop," ultimately providing a standardized and reproducible verification basis for the grid adaptability of grid-connected and grid-linked power stations.

[0047] The above steps provide a method to simulate the real operating scenario of a power station connected to the power grid, further simulate different extreme operating conditions and observe power quality, and determine the power station's adaptability to the power grid intensity. This method provides a low-cost and highly flexible way to determine whether a power station can operate stably under different power grid intensities, thus solving practical testing challenges.

[0048] The steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this patent.

[0049] Those skilled in the art will understand that the above embodiments are specific implementations of this application, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this application.

Claims

1. A power plant simulation test system, characterized by, The method comprises: An emulation server, comprising a power station test model, the power station test model comprising a power grid model, a grid-following device simulation model, and a grid-forming device simulation model, the grid-following device simulation model and the grid-forming device simulation model being connected to the power grid model through a power station bus model; A grid-forming device controller, which is communicatively connected to the grid-forming device simulation model; A coordination controller, which is communicatively connected to the grid-forming device controller, the power grid model, and the grid-following device simulation model.

2. The power plant simulation test system of claim 1, wherein The grid-following device simulation model is a CPU-based large-step simulation model; and the grid-forming device simulation model is an FPGA-based small-step simulation model.

3. The power plant simulation test system of claim 1, wherein, The power grid model comprises a three-phase power grid model and a main power station transformer model connected in series; wherein The main power station transformer model is connected to the grid-following device simulation model and the grid-forming device simulation model through a power station bus model and a feeder model.

4. The power plant simulation test system of claim 3, wherein, The feeder model comprises a grid-following feeder model and a grid-forming feeder model; wherein The number of the grid-following device simulation models is multiple, and the multiple grid-following device simulation models are connected to one grid-following feeder model; The number of the grid-forming device simulation models is multiple, and the multiple grid-forming device simulation models are connected to one grid-forming feeder model.

5. The power plant simulation test system of claim 4, wherein The number of the grid-forming device controllers is multiple, and the multiple grid-forming device controllers are respectively connected to the multiple grid-forming device simulation models.

6. A method of power station simulation testing, characterized by, The method comprises: constructing, on an emulation server, a power station test model of a power station to be tested, the power station test model comprising a power grid model, a grid-following device simulation model, and a grid-forming device simulation model; sending, by a grid-forming device controller and a coordination controller, different operating condition instructions to the power station test model to control the power station test model to enter different operating conditions; under different operating conditions, observing the power quality of a grid-connected point in the power grid model, and determining whether the power station to be tested has a power grid strength adaptability according to the power quality.

7. The power station simulation test method according to claim 6, characterized in that, The operating condition instructions comprise device power instructions. The sending, by the grid-forming device controller and the coordination controller, of different operating condition instructions to the power station test model to control the power station test model to enter different operating conditions comprises: sending, by the coordination controller, different device power instructions to the grid-following device simulation model; obtaining, by the grid-forming device controller, the different device power instructions sent by the coordination controller, and forwarding the device power instructions to the grid-forming device simulation model; The power grid model comprises a three-phase power grid model; and the operating condition instructions further comprise power grid impedance instructions.

8. The power station simulation test method according to claim 7, characterized in that, The sending, by the grid-forming device controller and the coordination controller, of different operating condition instructions to the power station test model to control the power station test model to enter different operating conditions further comprises: ​ The coordination controller sends different grid impedance instructions to the three-phase grid model, and the three-phase grid model changes its equivalent impedance amplitude in response to the grid impedance instructions.

9. The power station simulation test method according to claim 8, characterized in that, The different operating conditions include multiple operating powers and multiple equivalent impedance amplitudes. The observation of the power quality of the grid connection point in the grid model under different operating conditions and the determination of whether the power plant to be tested has the grid strength adaptability according to the power quality include: For each operating power, the equivalent impedance amplitude of the three-phase grid model is respectively subjected to step adjustment, wherein the step adjustment traverses the multiple equivalent impedance amplitudes. After each step adjustment, the power quality of the grid connection point in the grid model is observed, and whether the power plant to be tested has the grid strength adaptability is determined according to the power quality.

10. The power station simulation test method according to claim 8, characterized in that, The method further includes: When the power quality meets the preset condition under all the operating powers and in the step adjustment process of all the equivalent impedance amplitudes, it is determined that the power plant to be tested has the grid strength adaptability.

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