Construction method and device of pumped storage unit test system and test system

Abstract

The invention relates to the technical field of energy storage power stations, in particular to a construction method and device of a pumped storage unit test system and the test system.The method comprises the steps that pump turbine parameters are obtained, and a pump turbine simulation model is constructed according to the pump turbine parameters; in response to the first modeling instruction, constructing a generator motor simulation model, an excitation power simulation model, a main transformer simulation model and an AC power grid simulation model; in response to the second modeling instruction, establishing connection between the pump turbine simulation model and the generator motor simulation model, establishing connection between the generator motor simulation model and the excitation power simulation model and the main transformer simulation model, and establishing connection between the excitation power simulation model and the main transformer simulation model; and establishing connection between the main transformer simulation model and the alternating-current power grid simulation model to obtain the pumped storage unit test system, thereby solving the problem that an existing test mode is difficult to carry out overall performance test on a power system connected with the pumped storage unit.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage power stations, and in particular to a construction method, device and test system of a pumped storage unit test system. Background Art

[0002] Pumped storage is the most mature, economical and large-scale energy storage method currently. It is green, low-carbon and clean. Therefore, existing technologies often use the principle of pumped storage to build pumped storage power stations. Pumped storage power stations can effectively regulate the peaks, troughs, voltage and frequency of the power system. They are an important support for ensuring the safe and stable operation of the power system, an important guarantee for the large-scale development of renewable energy, and are conducive to the transformation of traditional power systems into new power systems with new energy as the main body. In order to accelerate the transformation of the power system, the power system will gradually connect units of pumped storage power stations of different types and sizes (i.e. pumped storage units).

[0003] Before a pumped-storage unit is put into use, the manufacturer usually conducts a dynamic model test on the pumped-storage unit independently to test and evaluate the performance of the pumped-storage unit itself. However, after the pumped-storage unit is connected to the power system, the overall performance of the power system will change, and the existing testing methods cannot perform an overall performance test on the power system connected to the pumped-storage unit. Connecting a pumped-storage unit solely based on existing test results may cause internal control incoordination problems in the power system connected to the pumped-storage unit. Moreover, if the pumped-storage unit is directly connected to the power system for testing, it may also affect the stable and safe operation of the power system. Therefore, how to build a pumped-storage unit test system has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a construction method, device and test system for a pumped storage unit test system, which solves the technical problem that the existing test method is difficult to perform overall performance test on a power system connected to the pumped storage unit.

[0005] On one hand, the present invention provides a method for constructing a pumped storage unit test system, comprising:

[0006] Acquire pump-turbine parameters, and construct a pump-turbine simulation model according to the pump-turbine parameters;

[0007] In response to the first modeling instruction, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model are constructed;

[0008] In response to the second modeling instruction, the pump-turbine simulation model is connected to the generator motor simulation model, the generator motor simulation model is connected to the excitation power simulation model and the main transformer simulation model respectively, the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model, to obtain the pumped storage unit test system;

[0009] Wherein, the water pump turbine simulation model, the excitation power simulation model and the AC power grid simulation model are respectively used to connect with the pumped storage unit to be tested.

[0010] Optionally, the pump turbine parameters include water guide mechanism parameters and turbine parameters;

[0011] The step of constructing a pump-turbine simulation model according to the pump-turbine parameters comprises:

[0012] constructing a water hammer model according to the water guiding mechanism parameters;

[0013] constructing a turbine model according to the turbine parameters;

[0014] The water hammer model is connected to the turbine model to obtain the pump-turbine simulation model.

[0015] Optionally, the water diversion mechanism parameters include the water diversion pipe length, water flow inertia time constant, relay closing time, and elastic water hammer time constant;

[0016] The constructing of the water hammer model according to the water guiding mechanism parameters comprises:

[0017] Determine whether the length of the water diversion pipeline is less than a preset length threshold. If so, construct a rigid water hammer model according to the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant; if not, construct an elastic water hammer model according to the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant.

[0018] Optionally, the turbine parameters include effective water head, guide vane opening, water flow inertia time constant, proportionality coefficient, flow rate at no load, damping coefficient, and runner angular velocity;

[0019] The step of constructing a turbine model according to the turbine parameters comprises:

[0020] Constructing an initial nonlinear model according to the effective water head, the guide vane opening, the water flow inertia time constant, the proportional coefficient, the flow rate when no load, the damping coefficient, and the runner angular velocity;

[0021] Performing perturbation analysis on the initial nonlinear model to obtain a linear model;

[0022] The linear model is simplified to obtain the turbine model.

[0023] Optionally, the excitation power simulation model includes: a pulse valve group, an excitation transformer, a starting circuit and a crowbar circuit;

[0024] The excitation transformer is respectively connected to the pulse valve group and the main transformer simulation model;

[0025] The pulse valve group is connected to the generator motor simulation model;

[0026] The starting circuit is connected to the pulse valve group;

[0027] The crowbar circuit is connected to the pulse valve group.

[0028] Another aspect of the present invention provides a device for constructing a pumped storage unit test system, the device comprising:

[0029] An acquisition module, used for acquiring pump-turbine parameters, and constructing a pump-turbine simulation model according to the pump-turbine parameters;

[0030] A first response module, used to respond to the first modeling instruction, to construct a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model;

[0031] A second response module is used to respond to the second modeling instruction, connect the water pump turbine simulation model with the generator motor simulation model, connect the generator motor simulation model with the excitation power simulation model and the main transformer simulation model respectively, connect the excitation power simulation model with the main transformer simulation model, and connect the main transformer simulation model with the AC power grid simulation model to obtain the pumped storage unit test system;

[0032] Wherein, the water pump turbine simulation model and the excitation power simulation model are respectively used to be connected to the pumped storage unit to be tested.

[0033] Another aspect of the present invention provides a pumped storage unit test system, which is applied to the method as described above, and the system comprises: a pump turbine simulation model, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, an AC power grid simulation model, and an analog-to-digital transmission component;

[0034] The water pump turbine simulation model is connected to the generator motor simulation model;

[0035] The generator motor simulation model is connected to the excitation power simulation model and the main transformer simulation model;

[0036] The main transformer simulation model is connected to the AC power grid simulation model and the excitation power simulation model respectively;

[0037] The AC power grid simulation model is connected to the pumped storage unit to be tested;

[0038] The excitation power simulation model and the pump-turbine simulation model are respectively connected to the analog-to-digital transmission component, and are connected to the pumped-storage unit to be tested through the analog-to-digital transmission component.

[0039] Optionally, the pumped storage unit to be tested includes a speed regulator and an excitation regulator;

[0040] The speed regulator is connected to the AC power grid simulation model, and is connected to the analog-to-digital transmission component, and is connected to the generator motor simulation model through the analog-to-digital transmission component;

[0041] The excitation regulator is connected to the analog-to-digital transmission component, and is connected to the excitation power simulation model through the analog-to-digital transmission component.

[0042] Optionally, the analog-to-digital transmission component includes a digital quantity output board, a digital quantity input board, an analog quantity input board, and an analog quantity output board.

[0043] Optionally, it also includes a cooperative controller;

[0044] The cooperative controller is connected with the speed regulator.

[0045] It can be seen from the above technical solutions that the present invention has the following advantages:

[0046] The present invention provides a method for constructing a pump-storage unit test system, comprising: obtaining pump-turbine parameters, and constructing a pump-turbine simulation model according to the pump-turbine parameters; responding to a first modeling instruction, constructing a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model; responding to a second modeling instruction, connecting the pump-turbine simulation model with the generator motor simulation model, connecting the generator motor simulation model with the excitation power simulation model and the main transformer simulation model respectively, and connecting the excitation power simulation model with the main transformer simulation model, and connecting the main transformer simulation model with the AC power grid simulation model, to obtain the pump-storage unit test system; wherein the pump-turbine simulation model, the excitation power simulation model, and the AC power grid simulation model are respectively used to connect to the pumped-storage unit to be tested.

[0047] In the present invention, by acquiring the pump-turbine parameters and constructing a pump-turbine simulation model according to the pump-turbine parameters, the construction of the pump-turbine simulation model is realized, and by responding to the first modeling instruction, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model are constructed, thus completing the construction of the generator motor simulation model, the construction of the primary excitation system simulation model, the construction of the main transformer simulation model, and the construction of the AC power grid simulation model; and by responding to the second modeling instruction, the pump-turbine simulation model is connected to the generator motor simulation model, and the generator motor simulation model is respectively connected to the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model. The pump-turbine simulation model is connected, and the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model, completing the construction of the connection relationship between the pump-turbine simulation model, the generator motor simulation model, the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model, thereby completing the construction of the simulation model of the power system. In practical applications, by connecting the pump-storage unit to be tested with the pump-turbine simulation model and the excitation power simulation model, and then performing a performance evaluation test on the pump-storage unit to be tested and the power system as a whole, it is possible to more accurately evaluate whether the pump-storage unit to be tested is suitable for the power system. Therefore, the pump-storage unit test system obtained by the construction method provided in this embodiment can realize the overall performance test of the power system connected to the pump-storage unit, solves the technical problem that the existing test method is difficult to perform the overall performance test on the power system connected to the pump-storage unit, and can perform more effective performance testing on the pump-storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 A flowchart of the steps of a method for constructing a pumped storage unit test system provided by an embodiment of the present invention;

[0050] Figure 2 A flowchart of a method for constructing a pumped storage unit test system provided by another embodiment of the present invention;

[0051] Figure 3 A schematic diagram of the structure of an initial nonlinear model provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the structure of a construction device for a pumped storage unit test system provided by an embodiment of the present invention;

[0053] Figure 5 A schematic diagram of the structure of a pumped storage unit test system provided by an embodiment of the present invention;

[0054] Figure 6 A schematic diagram of the structure of an analog-to-digital transmission component provided in an embodiment of the present invention;

[0055] Figure 7 Another structural schematic diagram of a pumped storage unit testing system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The embodiments of the present invention provide a construction method, device and test system of a pumped storage unit test system, which solves the technical problem that the existing test method is difficult to perform overall performance testing on a power system connected to a pumped storage unit.

[0057] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] See also Figure 1 The present invention provides a method for constructing a pumped storage unit test system, comprising:

[0059] 101. Obtain the pump-turbine parameters and build a pump-turbine simulation model based on the pump-turbine parameters.

[0060] It should be noted that a pump-turbine is a hydraulic machine that can operate as both a turbine and a pump. When operating as a turbine, water from the upstream reservoir can enter the runner through the water guide mechanism of the pump-turbine and drive the runner to rotate, and the runner drives the main shaft to rotate, which in turn drives the generator to generate electricity, realizing the conversion of water energy into electrical energy. When operating as a water pump, the main shaft is driven by an electric motor or other power device to rotate, driving the runner to rotate, and the water from the downstream reservoir is pumped to the upstream reservoir through the runner, consuming electrical energy, increasing the potential energy of the water, and realizing the conversion of electrical energy into water energy.

[0061] The pump-turbine parameters include water guide mechanism parameters and turbine parameters. In this embodiment, a pump-turbine simulation model is constructed in the simulation software based on the pump-turbine parameters.

[0062] 102. In response to the first modeling instruction, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model are constructed.

[0063] It should be noted that the first modeling instruction includes modeling information required for constructing a simulation model of a generator motor, modeling information required for constructing a simulation model of an excitation power unit, modeling information required for constructing a simulation model of a main transformer, and modeling information required for constructing a simulation model of an AC power grid. Among them, the water pump turbine, generator motor, excitation power unit, main transformer, and AC power grid are components of a pumped storage power station.

[0064] A generator motor is a motor device that can operate as both a generator and a motor. When operating as a generator, the pump turbine drives its rotor to operate and output electrical energy; when operating as a motor, its stator winding uses an external power supply to generate a magnetic field. Under the action of the magnetic field, its rotor rotates due to electromagnetic force, thereby driving the load to rotate and converting electrical energy into mechanical energy. Therefore, the generator motor can flexibly adapt to the different operating requirements of the pumped storage power station. The excitation power unit refers to the primary part of the excitation system, which refers to the main circuit related equipment and components that directly participate in the conversion and transmission of electrical energy. The main transformer is used to boost the voltage generated by the pumped storage unit and transmit the boosted voltage to the AC power grid.

[0065] This embodiment completes the construction of the simulation model of each component of the pumped-storage power station based on various types of modeling information contained in the first modeling instruction.

[0066] It is understandable that there is no sequential order relationship between step 101 and step 102. For example, in actual applications, step 102 may be performed first and then step 101, or step 101 and step 102 may be performed simultaneously.

[0067] 103. In response to the second modeling instruction, the water pump-turbine simulation model is connected to the generator motor simulation model, the generator motor simulation model is connected to the excitation power simulation model and the main transformer simulation model respectively, the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model to obtain a pumped-storage unit test system; wherein the water pump-turbine simulation model, the excitation power simulation model, and the AC power grid simulation model are respectively used to connect to the pumped-storage unit to be tested.

[0068] It should be noted that the second modeling instruction includes connection relationship information between the pump turbine, the generator motor, the excitation power unit, the main transformer, and the AC power grid. The connection relationship information includes that the pump turbine is connected to the generator motor, the generator motor is connected to the excitation power unit and the main transformer, the excitation power unit is connected to the main transformer, and the main transformer is connected to the AC power grid. The pumped storage unit to be tested refers to the pumped storage unit that needs to be tested.

[0069] This embodiment establishes connections between the constructed pump-turbine simulation model, the generator motor simulation model, the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model according to the connection relationship information in the second modeling instruction, thereby completing the overall simulation of the pumped-storage power station. When it is necessary to test the pumped-storage unit to be tested, the pumped-storage unit to be tested is connected to the pump-turbine simulation model and the excitation power simulation model respectively, so that the pumped-storage unit to be tested is connected to the pumped-storage power station, and the overall performance test of the pumped-storage power station connected to the pumped-storage unit is achieved by running the pumped-storage power station simulation model, thereby providing more effective test data for the performance evaluation test of the hardware function of the pumped-storage unit to be tested.

[0070] Therefore, in this embodiment, by acquiring the pump-turbine parameters and constructing a pump-turbine simulation model according to the pump-turbine parameters, the construction of the simulation model of the turbine pump is realized, and by responding to the first modeling instruction, the generator motor simulation model, the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model are constructed, thereby completing the construction of the simulation model of the generator motor, the simulation model of the primary excitation system, the simulation model of the main transformer, and the simulation model of the AC power grid; and by responding to the second modeling instruction, the pump-turbine simulation model is connected to the generator motor simulation model, and the generator motor simulation model is connected to the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model. The pump-turbine simulation model is connected, and the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model, completing the construction of the connection relationship between the pump-turbine simulation model, the generator motor simulation model, the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model, thereby completing the construction of the simulation model of the power system. In practical applications, by connecting the pump-storage unit to be tested with the pump-turbine simulation model and the excitation power simulation model, and then performing a performance evaluation test on the pump-storage unit to be tested and the power system as a whole, it is possible to more accurately evaluate whether the pump-storage unit to be tested is suitable for the power system. Therefore, the pump-storage unit test system constructed based on the construction method provided in this embodiment can realize the overall performance test of the power system connected to the pump-storage unit, solve the technical problem that the existing test method is difficult to perform the overall performance test on the power system connected to the pump-storage unit, and can perform more effective performance testing on the pump-storage unit, and provide more effective test data for the performance evaluation of the hardware function of the pump-storage unit to be tested.

[0071] See also Figure 2 Another embodiment of the present invention provides a method for constructing a pumped storage unit test system, comprising:

[0072] 201. Obtaining water guide mechanism parameters and water turbine parameters;

[0073] It should be noted that the water diversion mechanism parameters include the length of the water diversion pipe, the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant. The turbine parameters include the effective water head, the guide vane opening, the water flow inertia time constant, the proportional coefficient, the flow rate at no load, the damping coefficient, and the runner angular velocity. Among them, the elastic water hammer time constant is used to feedback the elastic water hammer strength of the system. The water flow inertia time constant is specifically the water flow inertia time constant in the water diversion system. The water head refers to the water level difference between the upstream and downstream of the hydropower station.

[0074] The pump turbine simulation model includes a water hammer model and a turbine model, wherein the water guide mechanism parameters are used to construct the water hammer model, and the turbine parameters are used to construct the turbine model.

[0075] It can be understood that the construction of the water hammer model in the following step 202 and the turbine model in step 203 both require the use of the water flow inertia time constant. Therefore, the water flow inertia time constant in the water guiding mechanism parameters in step 201 and the water flow inertia time constant in the turbine parameters are the same parameter.

[0076] 202. Construct a water hammer model based on the parameters of the water guiding mechanism.

[0077] It should be noted that the length of the water diversion pipe affects the head loss, thereby affecting the power generation efficiency or pumping efficiency of the pump-turbine. Therefore, this embodiment determines the most suitable water hammer model based on the comparison result of the obtained length of the water diversion pipe and the preset length threshold, and constructs the water hammer model based on the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant, thereby further improving the effectiveness and accuracy of the test.

[0078] In one example, the specific steps of step 202 include:

[0079] Determine whether the length of the water diversion pipeline is less than the preset length threshold. If so, construct a rigid water hammer model based on the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant; if not, construct an elastic water hammer model based on the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant.

[0080] It should be noted that when the length of the water diversion pipe is less than the preset length threshold, the water and the pipe wall can be regarded as incompressible rigid bodies. Therefore, the water hammer model in the pipe can be a rigid water hammer model. Based on this, the rigid water hammer model is constructed using the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant.

[0081] Among them, the mathematical representation of the rigid water hammer model is as follows:

[0082]

[0083] The constraints of this rigid model are:

[0084] Tf\Tr>6

[0085] T w \Tr>2

[0086]

[0087] in, is the ratio function of head and flow rate; is the water head, i.e. the difference in water level between upstream and downstream; For flow; T is the water flow inertia time constant in the water diversion system. f is the relay closing time, T r is the elastic water hammer time constant; L i represents the length of the i-th water diversion pipeline, a i is the propagation speed of water hammer pressure wave in the pipeline, a is generally taken as 1000m / s. i is used to represent the number of water diversion pipelines. For example, in the case of one machine with multiple pipelines, i is a positive integer and greater than 1.

[0088] When the length of the water diversion pipeline is greater than the preset length threshold, the water hammer model in the pipe can adopt the elastic water hammer model, wherein the mathematical expression of the elastic water hammer model is as follows:

[0089]

[0090] Among them, the constraints of the elastic water hammer model are:

[0091] 3 <Tf\T r <6

[0092] 0.5 <T w \T r <2

[0093] in, is the ratio function of head and flow rate; is the water head, i.e. the difference in water level between upstream and downstream; For flow; is the water flow inertia time constant in the water diversion system. Tf is the relay closing time, and Tr is the elastic water hammer time constant.

[0094] In one example, the preset length threshold may be set to 800 m.

[0095] 203. Construct a turbine model based on turbine parameters.

[0096] It should be noted that the steps of constructing a turbine model according to turbine parameters include:

[0097] S31. Construct an initial nonlinear model based on the effective water head, guide vane opening, water flow inertia time constant, proportional coefficient, no-load flow, damping coefficient, and impeller angular velocity.

[0098] It should be noted that this embodiment considers the turbine as an ideal valve, and takes into account factors such as the head loss of the water diversion pipeline, the mechanical power loss of the unit, and the flow loss of the turbine to construct the IEEE nonlinear mathematical model of the turbine (i.e., the initial nonlinear model). The structure of the initial nonlinear model is as follows: Figure 3 shown.

[0099] According to the structure of the initial nonlinear model, the mathematical expression of the initial nonlinear model is as follows:

[0100]

[0101] in, is the output power of the turbine, q tt is the flow rate through the turbine, is the flow rate when no load is applied, is the proportionality coefficient, is the guide vane opening, is the effective water head, D is the damping coefficient, f is the friction coefficient, and ω is the angular velocity of the runner.

[0102] S32. Perform perturbation analysis on the initial nonlinear model to obtain a linear model.

[0103] It should be noted that in this embodiment, the hydraulic friction loss is ignored, and the above initial nonlinear model is subjected to perturbation analysis, and the linear model can be obtained as follows:

[0104]

[0105]

[0106]

[0107] in, It is a micro increment of turbine output power; It is the slight increment of turbine water gate opening.

[0108] S33. Simplify the linear model to obtain a turbine model.

[0109] It should be noted that since the initial state of the turbine is a standard per unit value, based on this, the linear model is simplified to obtain the turbine model, where the mathematical expression of the turbine model is as follows:

[0110]

[0111] The turbine model constructed based on steps S31 to S33 of this embodiment requires fewer parameters to be input during actual use, and the parameters are easy to obtain, thereby improving the convenience of use.

[0112] 204. Connect the water hammer model with the turbine model to obtain a pump turbine simulation model.

[0113] It should be noted that, based on the construction principle of step 202 to step 203, a water hammer model and a turbine model are constructed in the simulation software, and the output end of the water hammer model is connected to the input end of the turbine model to obtain a pump turbine simulation model.

[0114] 205. In response to the first modeling instruction, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model are constructed.

[0115] 206. In response to the second modeling instruction, the water pump-turbine simulation model is connected to the generator motor simulation model, the generator motor simulation model is connected to the excitation power simulation model and the main transformer simulation model respectively, the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model to obtain a pumped-storage unit test system; wherein the water pump-turbine simulation model, the excitation power simulation model, and the AC power grid simulation model are respectively used to connect to the pumped-storage unit to be tested.

[0116] It should be noted that step 205 and step 206 may refer to step 102 to step 103, which will not be described in detail here.

[0117] In a specific embodiment, the excitation power simulation model includes: a pulse valve group, an excitation transformer, a starting circuit and a crowbar circuit;

[0118] The excitation transformer is connected to the pulse valve group and the main transformer simulation model respectively;

[0119] The pulse valve group is connected to the generator motor simulation model;

[0120] The starting circuit is connected to the pulse valve group;

[0121] The crowbar circuit is connected to the pulse valve group.

[0122] It should be noted that the excitation transformer is used to transform the received voltage to provide a suitable AC power supply for the primary part of the excitation system. The pulse valve group is used to convert the AC voltage output by the excitation transformer into a DC voltage to provide a DC excitation current for the generator motor simulation model. The crowbar circuit includes a trigger circuit and a protection element. When a fault or abnormality is detected, the trigger circuit acts quickly to connect the protection element to the circuit to protect the system. The starting circuit is used to provide an initial power supply to the pulse valve group to control the timing of opening or closing the pulse valve group. Among them, the pulse valve group is connected to the machine end of the generator motor simulation model, and is specifically input into the generator rotor winding end in the form of positive and negative terminals. The pulse valve group is connected in parallel with the starting circuit and the crowbar circuit respectively.

[0123] In one example, the pulse valve group may be a six-pulse valve group.

[0124] In one example, the excitation transformer may be a star-delta transformer.

[0125] In one example, the simulation software may employ RTDS.

[0126] In one example, when RTDS is used to construct a simulation model, the generator motor simulation model can use the traditional motor model of RTDS, which is specifically "Phase-domain Synchronous Machine", that is, rtds_PDSM_FLT_light, a new generation of phase domain control model. This model has a high degree of accuracy and reliability. Among them, the specifications of the generator motor can be selected according to the actual situation. For example, a 400MW pumped storage unit motor model can be built on RTDS.

[0127] In one example, when RTDS is used to construct a simulation model, the main transformer may adopt a two-winding transformer model in RTDS, or may be selected according to actual needs, for example, a three-winding transformer model may be adopted according to actual needs of the on-site project.

[0128] In one example, when RTDS is used to construct a simulation model, the AC power grid simulation model may use an infinite power source model.

[0129] Therefore, in this embodiment, by acquiring the pump-turbine parameters and constructing a pump-turbine simulation model according to the pump-turbine parameters, the construction of the simulation model of the turbine pump is realized, and by responding to the first modeling instruction, the generator motor simulation model, the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model are constructed, thereby completing the construction of the simulation model of the generator motor, the simulation model of the primary excitation system, the simulation model of the main transformer, and the simulation model of the AC power grid; and by responding to the second modeling instruction, the pump-turbine simulation model is connected to the generator motor simulation model, and the generator motor simulation model is connected to the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model. The pump-turbine simulation model is connected, and the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model, completing the construction of the connection relationship between the pump-turbine simulation model, the generator motor simulation model, the excitation power simulation model, the main transformer simulation model, and the AC power grid simulation model, thereby completing the construction of the simulation model of the power system. In practical applications, by connecting the pump-storage unit to be tested with the pump-turbine simulation model and the excitation power simulation model, and then performing a performance evaluation test on the pump-storage unit to be tested and the power system as a whole, it is possible to more accurately evaluate whether the pump-storage unit to be tested is suitable for the power system. Therefore, the pump-storage unit test system obtained by the construction method provided in this embodiment can realize the overall performance test of the power system connected to the pump-storage unit, solve the technical problem that the existing test method is difficult to perform the overall performance test on the power system connected to the pump-storage unit, and can perform more effective performance testing on the pump-storage unit, and provide more effective test data for the performance evaluation test of the hardware function of the pump-storage unit to be tested.

[0130] See also Figure 4 , a construction device of a pumped storage unit test system provided by an embodiment of the present invention comprises:

[0131] An acquisition module 301 is used to acquire pump-turbine parameters and construct a pump-turbine simulation model according to the pump-turbine parameters;

[0132] The first response module 302 is used to respond to the first modeling instruction and build a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model;

[0133] The second response module 303 is used to respond to the second modeling instruction, connect the water pump turbine simulation model with the generator motor simulation model, connect the generator motor simulation model with the excitation power simulation model and the main transformer simulation model respectively, connect the excitation power simulation model with the main transformer simulation model, and connect the main transformer simulation model with the AC power grid simulation model to obtain a pumped storage unit test system;

[0134] Among them, the pump-turbine simulation model and the excitation power simulation model are respectively used to connect with the pumped storage unit to be tested.

[0135] In a specific embodiment, the pump turbine parameters include water diversion mechanism parameters and turbine parameters; the acquisition module 301 includes

[0136] A first construction unit is used to construct a water hammer model according to the water guiding mechanism parameters;

[0137] A second construction unit is used to construct a turbine model according to turbine parameters;

[0138] The connection unit is used to connect the water hammer model with the turbine model to obtain a pump turbine simulation model.

[0139] In a specific embodiment, the first construction unit is specifically used to determine whether the length of the water diversion pipeline is less than a preset length threshold. If so, a rigid water hammer model is constructed based on the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant; if not, an elastic water hammer model is constructed based on the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant.

[0140] In a specific embodiment, the second construction unit is specifically used to construct an initial nonlinear model based on the effective water head, guide vane opening, water flow inertia time constant, proportional coefficient, no-load flow, damping coefficient, and impeller angular velocity; perform disturbance analysis on the initial nonlinear model to obtain a linear model; and simplify the linear model to obtain a turbine model.

[0141] See also Figure 5 , a pumped storage unit test system provided by an embodiment of the present invention comprises: a water pump turbine simulation model 1, a generator motor simulation model 2, an excitation power simulation model 3, a main transformer simulation model 4, an AC power grid simulation model 5, and an analog-to-digital transmission component 6;

[0142] The water pump turbine simulation model 1 is connected to the generator motor simulation model 2;

[0143] The generator motor simulation model 2 is connected to the excitation power simulation model 3 and the main transformer simulation model 4;

[0144] The main transformer simulation model 4 is connected to the AC power grid simulation model 5 and the excitation power simulation model 3 respectively;

[0145] The AC power grid simulation model 5 is connected to the pumped storage unit 7 to be tested;

[0146] The excitation power simulation model 3 and the pump-turbine simulation model 1 are respectively connected to the analog-to-digital transmission component 6 , and are connected to the pumped-storage unit 7 to be tested through the analog-to-digital transmission component 6 .

[0147] It should be noted that the analog-to-digital transmission component 6 is used to transmit analog data and digital data. The pumped-storage unit 7 to be tested is connected to the analog-to-digital transmission component 6, and data is exchanged with the pump-turbine simulation model 1 and the excitation power simulation model 3 through the analog-to-digital transmission component 6, so that the pumped-storage unit 7 to be tested is connected to the constructed simulation model of the pumped-storage power station.

[0148] Therefore, this embodiment completes the construction of the simulation model of the pumped-storage power station through the water pump turbine simulation model 1, the generator motor simulation model 2, the excitation power simulation model 3, the main transformer simulation model 4, and the AC power grid simulation model 5, and connects the pumped-storage unit 7 to be tested by constructing an analog-to-digital transmission component 6, thereby connecting the pumped-storage unit 7 to be tested through a hardware-in-the-loop method, thereby forming a complete test system, which provides technical support for more comprehensive and effective testing of the pumped-storage unit 7 to be tested.

[0149] In a specific embodiment, Figure 5 As shown, the pumped storage unit 7 to be tested includes a speed regulator and an excitation regulator;

[0150] The speed regulator is connected to the AC power grid simulation model 5, and is connected to the analog-to-digital transmission component 6, and is connected to the generator motor simulation model 2 through the analog-to-digital transmission component 6;

[0151] The excitation regulator is connected to the analog-to-digital transmission component 6 , and is connected to the excitation power simulation model 3 through the analog-to-digital transmission component 6 .

[0152] It should be noted that the speed governor is used to control the rotor speed of the generator, and the excitation regulator is used to control the terminal voltage of the unit.

[0153] In a specific embodiment, the analog-to-digital transmission component 6 includes a digital output board GTDO, a digital input board GTDI, an analog input board GTAI, and an analog output board GTAO.

[0154] It should be noted that if Figure 6As shown, the digital output board GTDO, the digital input board GTDI, the analog input board GTAI, and the analog output board GTAO are connected to the excitation regulator 72, the speed regulator 71, and the simulation model, respectively. The simulation model refers to a simulation model of a pump-storage power station composed of a water pump turbine simulation model 1, a generator motor simulation model 2, an excitation power simulation model 3, a main transformer simulation model 4, and an AC power grid simulation model 5.

[0155] In this embodiment, high-speed data transmission is achieved by connecting the digital output board GTDO, the digital input board GTDI, the analog input board GTAI, and the analog output board GTAO to the excitation regulator, the speed regulator, and the real-time simulator respectively.

[0156] In a specific embodiment, see Figure 7 , the system also includes a cooperative controller;

[0157] The cooperative controller is connected to the speed regulator.

[0158] It should be noted that Figure 7 Another structure of the pumped storage unit test system is shown. Figure 7 In the process, the cooperative controller is connected with the speed governor to coordinate and control the rotor speed of the generator under different water heads.

[0159] In a specific embodiment, see Figure 7 , and also includes a pulse distribution module, which is respectively connected between the excitation regulator and the pulse valve group, and is used to control the on and off of each thyristor in the pulse valve group according to the signal output by the excitation regulator.

[0160] Understandably, Figure 7 The water-guiding mechanism is configured with a water hammer model, and the runner is configured with a turbine model.

[0161] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0162] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0163] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0164] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each functional unit may be physically separate, or two or more functional units may be integrated into one processing unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0165] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0166] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0167] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for constructing a pumped storage unit test system, characterized in that: The method comprises: Acquire pump-turbine parameters, and construct a pump-turbine simulation model according to the pump-turbine parameters; In response to the first modeling instruction, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model are constructed; In response to the second modeling instruction, the pump-turbine simulation model is connected to the generator motor simulation model, the generator motor simulation model is connected to the excitation power simulation model and the main transformer simulation model respectively, the excitation power simulation model is connected to the main transformer simulation model, and the main transformer simulation model is connected to the AC power grid simulation model, to obtain the pumped storage unit test system; Wherein, the water pump turbine simulation model, the excitation power simulation model and the AC power grid simulation model are respectively used to connect with the pumped storage unit to be tested.

2. The method according to claim 1, characterized in that: The pump turbine parameters include water guide mechanism parameters and water turbine parameters; The step of constructing a pump-turbine simulation model according to the pump-turbine parameters comprises: constructing a water hammer model according to the water guiding mechanism parameters; constructing a turbine model according to the turbine parameters; The water hammer model is connected to the turbine model to obtain the pump-turbine simulation model.

3. The method according to claim 2, characterized in that The water diversion mechanism parameters include the water diversion pipe length, water flow inertia time constant, relay closing time, and elastic water hammer time constant; The constructing of the water hammer model according to the water guiding mechanism parameters comprises: Determine whether the length of the water diversion pipeline is less than a preset length threshold. If so, construct a rigid water hammer model according to the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant; if not, construct an elastic water hammer model according to the water flow inertia time constant, the relay closing time, and the elastic water hammer time constant.

4. The method according to claim 2, characterized in that: The turbine parameters include effective water head, guide vane opening, water flow inertia time constant, proportionality coefficient, flow rate when no-load, damping coefficient, and runner angular velocity; The step of constructing a turbine model according to the turbine parameters comprises: Constructing an initial nonlinear model according to the effective water head, the guide vane opening, the water flow inertia time constant, the proportional coefficient, the flow rate when no load, the damping coefficient, and the runner angular velocity; Performing perturbation analysis on the initial nonlinear model to obtain a linear model; The linear model is simplified to obtain the turbine model.

5. The method according to claim 1, characterized in that The excitation power simulation model includes: a pulse valve group, an excitation transformer, a starting circuit and a crowbar circuit; The excitation transformer is respectively connected to the pulse valve group and the main transformer simulation model; The pulse valve group is connected to the generator motor simulation model; The starting circuit is connected to the pulse valve group; The crowbar circuit is connected to the pulse valve group.

6. A construction device for a pumped storage unit test system, characterized in that: The device comprises: An acquisition module, used for acquiring pump-turbine parameters, and constructing a pump-turbine simulation model according to the pump-turbine parameters; A first response module, used to respond to the first modeling instruction, to construct a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, and an AC power grid simulation model; A second response module is used to respond to the second modeling instruction, connect the water pump turbine simulation model with the generator motor simulation model, connect the generator motor simulation model with the excitation power simulation model and the main transformer simulation model respectively, connect the excitation power simulation model with the main transformer simulation model, and connect the main transformer simulation model with the AC power grid simulation model to obtain the pumped storage unit test system; Wherein, the water pump turbine simulation model and the excitation power simulation model are respectively used to be connected to the pumped storage unit to be tested.

7. A pumped storage unit testing system, applied to the method according to any one of claims 1 to 5, characterized in that: The system comprises: a water pump turbine simulation model, a generator motor simulation model, an excitation power simulation model, a main transformer simulation model, an AC power grid simulation model, and an analog-to-digital transmission component; The water pump turbine simulation model is connected to the generator motor simulation model; The generator motor simulation model is connected to the excitation power simulation model and the main transformer simulation model; The main transformer simulation model is connected to the AC power grid simulation model and the excitation power simulation model respectively; The AC power grid simulation model is connected to the pumped storage unit to be tested; The excitation power simulation model and the pump-turbine simulation model are respectively connected to the analog-to-digital transmission component, and are connected to the pumped-storage unit to be tested through the analog-to-digital transmission component.

8. The system according to claim 7, characterized in that The pumped storage unit to be tested includes a speed regulator and an excitation regulator; The speed regulator is connected to the AC power grid simulation model, and is connected to the analog-to-digital transmission component, and is connected to the generator motor simulation model through the analog-to-digital transmission component; The excitation regulator is connected to the analog-to-digital transmission component, and is connected to the excitation power simulation model through the analog-to-digital transmission component.

9. The system according to claim 8, characterized in that The analog-to-digital transmission component includes a digital quantity output board, a digital quantity input board, an analog quantity input board, and an analog quantity output board.

10. The system according to claim 9, characterized in that Also includes a cooperative controller; The cooperative controller is connected with the speed regulator.

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