Current limiter generation method and device of variable-speed pumped storage unit and current limiter
By building a flexible current limiter in a variable speed pumped storage unit, using factors such as the limiting value of the PI controller and the stator current operation limit, the output exceeding problem caused by the hard limiting method is solved, achieving higher flexibility and safety.
Patent Information
- Application Number
- CN202411838543.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-04-11
AI Technical Summary
The AC excitation reactive power control output limiter of existing variable speed pumping storage units adopts a hard limiting method, which lacks flexibility, resulting in the output current easily exceeding the adjustment capacity of the excitation system under certain operating conditions, which poses safety risks.
By calculating the limit value of the PI controller based on the parameter information of the variable speed pumping storage unit and obtaining the current operating status, and combining the stator current operation limit, reactive power limit and PQ curve limit, a reactive control current limiter and voltage control current limiter of the variable speed pumping storage unit are built so that its output limit changes with the system operating conditions.
The flexibility and reliability of reactive current output limit is achieved, the safety risk of output exceeding the adjustment capability of the excitation system is avoided, and the grid operation needs and equipment safety are taken into account.
Smart Images
Figure CN119813847A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of AC excitation reactive power control output management of variable speed units, and in particular to a current limiter generation method, device and current limiter for variable speed pumped storage units. Background Art
[0002] Doubly-fed variable-speed pumped-storage units have flexibility and reliability that surpass traditional synchronous generators. In addition to the fact that their electrical structure has multi-phase rotor symmetrical AC excitation compared to traditional synchronous generators, the key lies in the need for an excitation control system that can fully utilize the operating characteristics of the motor. The AC excitation control of variable-speed pumped-storage units can achieve decoupling control of active and reactive power on the stator side by adopting a stator voltage-oriented or stator flux-oriented vector control strategy. The control links of active and reactive power of existing variable-speed pumped-storage units mostly use hard limiting to limit the output current of the power outer loop to a certain range. The output current limit value of the power loop is generally selected as the maximum value of the rotor current, and the active power control and reactive power control use the same current limit value. Under certain operating conditions, the current output of the power control may exceed the regulation capacity of the AC excitation system.
[0003] The AC excitation outer loop control of the doubly fed unit is the power control loop, and its control structure is as follows: Figure 1 Indicates that Q ref and P ref The actual operating data of active power and reactive power are Qs and Ps are standard operating data of active power and reactive power respectively. The errors of active and reactive power on the stator side are obtained by subtracting them respectively. The errors of active and reactive power on the stator side are converted into After that, the reference values of the q-axis and d-axis components of the rotor current are output respectively and transmitted as input to the inner loop of the AC excitation current control, where Q max and Q min are the upper and lower limits of the PI controller on the reactive power control side, P max and P min They are the upper and lower limits of the PI controller on the active power control side respectively.
[0004] The existing variable-speed pumped-storage unit AC excitation outer loop control mostly adopts the controller design of the PI link, and its control output mostly adopts the hard limit method, that is, the maximum and minimum limit values are fixed values, which do not change with time, and the output limits of the voltage loop and the reactive loop generally adopt the same limit value. This design does not fully consider the impact of current changes under different operating conditions of the variable-speed pumped-storage unit, especially when the current output of the active power control of the AC excitation system is close to the limit value, under certain conditions, it may cause the output current of the reactive power control to exceed the regulation capacity of the AC excitation system. Therefore, it is necessary to design a new type of variable-speed pumped-storage unit reactive power and voltage loop output current limiter according to the real-time operating status of the unit to avoid the safety risk caused by the hard limiter of the output limiter. Summary of the invention
[0005] The purpose of the present application is to provide a current limiter generation method, device and current limiter for a variable speed pumped storage unit, so as to overcome the problem that the existing variable speed unit AC excitation reactive control output limiter adopts the form of hard limiting, lacks flexibility, and the limiter output is prone to exceed the adjustment capacity of the excitation system under certain working conditions.
[0006] To achieve the above-mentioned purpose, the current limiter generation method of the variable speed pumped storage unit provided in the present application specifically includes: according to the parameter information of the variable speed pumped storage unit, through the rotor current operating limit of the variable speed pumped storage unit and the current operating state of the variable speed pumped storage unit, the limiting value of the PI controller is calculated; according to the stator current operating limit of the variable speed pumped storage unit, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit, the input limiting data of the current limiter is calculated; and the reactive control current limiter of the variable speed pumped storage unit and / or the voltage control current limiter of the variable speed pumped storage unit are constructed through the limiting value of the PI controller and the input limiting data.
[0007] In the above-mentioned current limiter generation method of the variable speed pumped-storage unit, optionally, obtaining the limiting value of the PI controller by calculating the unit rotor current operating limit and the current operating state of the variable speed pumped-storage unit according to the parameter information of the variable speed pumped-storage unit includes: obtaining the limiting value of the PI controller by calculating the unit rotor maximum operating current and the rotor d-axis current control target value under the current operating state of the variable speed pumped-storage unit according to the parameter information of the variable speed pumped-storage unit.
[0008] In the above-mentioned current limiter generation method of the variable speed pumped storage unit, optionally, the input limiting data of the current limiter calculated based on the stator current operation limit of the variable speed pumped storage unit, the operation reactive power limit of the variable speed pumped storage unit, and the reactive power operation range of the variable speed pumped storage unit includes: the input limiting data of the current limiter includes the input limiting data of the reactive control current limiter; wherein, the maximum and minimum values of the stator q-axis current are obtained according to the stator current operation limit analysis of the variable speed pumped storage unit; the input limiting information of the reactive control current limiter of the variable speed pumped storage unit is obtained according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit under the current operation state, and the PQ curve of the variable speed pumped storage unit; the input limiting data of the current limiter is obtained according to the input limiting information, the operation reactive power limit of the variable speed pumped storage unit, and the reactive power operation range of the variable speed pumped storage unit.
[0009] In the above-mentioned current limiter generation method of the variable speed pumped storage unit, optionally, obtaining the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis includes: obtaining the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis of the doubly fed induction motor steady-state equivalent circuit.
[0010] In the above-mentioned current limiter generation method of the variable speed pumped-storage unit, optionally, the input limiting information of the reactive control current limiter of the variable speed pumped-storage unit is obtained according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped-storage unit in the current operating state and the PQ curve of the variable speed pumped-storage unit, including: obtaining a first reactive power limiting value according to the maximum and minimum values of the stator q-axis current and the terminal voltage of the variable speed pumped-storage unit in the current operating state; obtaining a second reactive power limiting value according to the limitation analysis of the PQ curve of the variable speed pumped-storage unit; and obtaining the input limiting information of the reactive control current limiter of the variable speed pumped-storage unit through the first reactive power limiting value and the second reactive power limiting value.
[0011] The present application also provides a current limiter generating device for a variable speed pumped storage unit, the device comprising a controller analysis module, an input analysis module and a construction module; the controller analysis module is used to calculate the limiting value of the PI controller according to the parameter information of the variable speed pumped storage unit, through the rotor current operating limit of the variable speed pumped storage unit and the current operating state of the variable speed pumped storage unit; the input analysis module is used to calculate the input limiting data of the current limiter according to the stator current operating limit of the variable speed pumped storage unit, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit; the construction module is used to construct a variable speed pumped storage unit reactive control current limiter and / or a variable speed pumped storage unit voltage control current limiter through the limiting value of the PI controller and the input limiting data.
[0012] In the current limiter generating device of the above-mentioned variable speed pumped storage unit, optionally, the controller analysis module includes: obtaining the limiting value of the PI controller by calculating the maximum operating current of the unit rotor and the rotor d-axis current control target value under the current operating state of the variable speed pumped storage unit according to the parameter information of the variable speed pumped storage unit.
[0013] In the above-mentioned current limiter generating device of the variable speed pumped-storage unit, optionally, the input analysis module includes a stator analysis unit and a power analysis unit; the input limiting data of the current limiter includes the input limiting data of the reactive control current limiter; the stator analysis unit is used to obtain the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis of the variable speed pumped-storage unit; the power analysis unit is used to obtain the input limiting information of the reactive control current limiter of the variable speed pumped-storage unit according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped-storage unit under the current operating state and the PQ curve of the variable speed pumped-storage unit; the input limiting data of the current limiter is obtained according to the input limiting information, the operating reactive power limit of the variable speed pumped-storage unit and the reactive power operating range of the variable speed pumped-storage unit.
[0014] In the above-mentioned current limiter generating device of the variable speed pumped-storage unit, optionally, the power analysis unit includes: obtaining a first reactive power limit value based on the maximum and minimum values of the stator q-axis current and the terminal voltage of the variable speed pumped-storage unit under the current operating state; obtaining a second reactive power limit value based on the limitation analysis of the PQ curve of the variable speed pumped-storage unit; and obtaining the input limiting information of the reactive control current limiter of the variable speed pumped-storage unit through the first reactive power limit value and the second reactive power limit value.
[0015] The present application also provides a current limiter generated by the current limiter generation method of the variable speed pumped storage unit, the current limiter comprising a reactive control loop module and a voltage control loop module; the reactive control loop module comprising an upper power limiter and a lower power limiter; the upper power limiter is used to provide the error between the reactive power of the unit and the upper reactive power operating limit under the current working condition to the PI controller for processing, so as to obtain the upper current limit of the reactive control loop; the lower power limiter is used to provide the error between the reactive power of the unit and the lower reactive power operating limit under the current working condition to the PI controller for processing, so as to obtain the lower current limit of the reactive control loop; the voltage control loop module comprises an upper voltage limiter and a lower voltage limiter; the upper voltage limiter is used to provide the error between the operating voltage of the unit and the upper voltage operating limit during steady-state operation to the PI controller for processing, so as to obtain the upper current limit of the voltage control loop; the lower voltage limiter is used to provide the error between the operating voltage of the unit and the lower voltage operating limit during steady-state operation to the PI controller for processing, so as to obtain the lower current limit of the voltage control loop.
[0016] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.
[0017] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.
[0018] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.
[0019] The beneficial technical effect of the present application is that the current limiter comprehensively considers factors such as the stator current operating limit of the variable speed unit, the rotor current operating limit, the unit operating reactive power limit, the reactive power operating range (PQ power circle), etc., to achieve the output limit of reactive current that changes with the system operating conditions, has greater flexibility and reliability, and while taking into account the grid operation requirements and equipment safety, can fully tap the equipment capabilities of the AC excitation controller itself, and achieve flexible control of the AC excitation of the variable speed pumped storage unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings described herein are used to provide a further understanding of the present application, constitute a part of the present application, and do not constitute a limitation of the present application. In the drawings:
[0021] Figure 1 A schematic diagram of an outer loop model of AC excitation control of a doubly-fed generator set provided in one embodiment of the present application;
[0022] Figure 2 A schematic diagram of a reactive outer loop model of AC excitation control of a variable speed pumped storage unit provided in one embodiment of the present application;
[0023] Figure 3A A schematic flow chart of a method for generating a current limiter of a variable speed pumped storage unit provided in an embodiment of the present application;
[0024] Figure 3B A schematic diagram of a reactive voltage loop structure of an AC excitation control of a variable speed pumped storage unit provided in an embodiment of the present application;
[0025] Figure 4 A schematic diagram of the structure of a voltage-controlled current limiter for a variable-speed pumped storage unit provided in one embodiment of the present application;
[0026] Figure 5 A schematic diagram of the structure of a reactive power control current limiter for a variable speed pumped storage unit provided in one embodiment of the present application;
[0027] Figure 6 A schematic diagram of a steady-state equivalent circuit structure of a doubly-fed induction motor provided in one embodiment of the present application;
[0028] Fig. 7A and Figure 7B A schematic diagram of the principle of an AC excitation reactive control current limiter provided in one embodiment of the present application;
[0029] Fig. 8A and Figure 8B A schematic diagram of the principle of an AC excitation voltage controlled current limiter provided in one embodiment of the present application;
[0030] Fig. 9 A schematic diagram of a reactive voltage control loop structure using a conventional current limiter provided in one embodiment of the present application;
[0031] Fig.10 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION
[0032] The following will describe the implementation methods of the present application in detail in conjunction with the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present application and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present application.
[0033] In addition, the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order different from that shown here.
[0034] Please refer to Figure 3A As shown, the current limiter generation method of the variable speed pumped storage unit provided in the present application specifically includes:
[0035] S301 calculates and obtains the limit value of the PI controller according to the parameter information of the variable speed pumped storage unit, the rotor current operation limit of the variable speed pumped storage unit and the current operation state of the variable speed pumped storage unit;
[0036] S302 calculates input amplitude limiting data of the current limiter according to the stator current operation limit of the variable speed pumped storage unit, the operation reactive power limit of the variable speed pumped storage unit, and the reactive power operation range of the variable speed pumped storage unit;
[0037] S303 constructs a variable speed pumped storage unit reactive power control current limiter and / or a variable speed pumped storage unit voltage control current limiter through the limit value of the PI controller and the input limit data.
[0038] At present, the reactive power control logic of variable speed pumped storage units is mostly adopted Figure 2 The structure diagram shown. According to different unit operation modes, reactive power control can include two modes: constant reactive power control and constant voltage control. In the figure, QF is the reactive power control mode judgment flag. When QF is set to 1, it is the constant reactive power control mode, and when MF is set to 0, it is the constant voltage control mode. Among them, T Qmeas Reactive power measurement time constant; K pQ and T iQ is the reactive loop proportional gain and time constant; dQ max and dQ min K is the upper and lower limits of reactive power command change; pV and T iV is the voltage loop proportional gain and time constant; dU max and dU min is the upper and lower limits of voltage command change; i qmax and i qmin The upper and lower limits of reactive current. Among them, the PI controller The output limit i qmax 、i qmin Generally, it is set to a fixed limit value that does not change over time. For details, please refer to the structure of the variable speed pumped storage unit AC excitation reactive power and voltage control output limiter in this application. Figure 3B As shown, the maximum and minimum limits of the reactive power control loop output are q max_limand q min_lim ; The maximum and minimum limits of the voltage control loop output are u max_lim and u min_lim The time-varying limiter provided in this application corresponds to Figure 3B The upper and lower limits q max_lim and q min_lim 、u max_lim and u min_lim These are quantities that change with the system's operating status. Figure 3B Based on PI controller The voltage control structure, the voltage control limiter is as follows Figure 4 As shown. The upper limiter is to set the unit operating voltage U t The voltage upper limit U during steady-state operation max After the error passes through the PI controller, the current upper limit of the output voltage control loop; the lower limit limiter is to set the unit operating voltage U t The voltage lower limit U during steady-state operation min After the error is passed through the PI controller, the current lower limit of the output voltage control loop is output. The input of the limiter is the terminal voltage u t 、Maximum voltage u max and the minimum value u min The output is the upper and lower limits of the output current of the voltage control loop u max_lim and u min_lim , K pVlim and T iVlim are the gain and time constant of the PI controller.
[0039] in, Figures 2 to 9 Middle, Q gen With Q ref is the reactive power input value, and then compared with Q ref The power error value is determined by subtraction, where Q gen is the reactive power of the unit, Q ref is the reactive power of the unit during operation; similarly, U t and U ref The corresponding voltage error is determined by subtraction, U t is the unit operating voltage, U ref This is the voltage during steady-state operation, which is uniformly defined here and will not be explained one by one later.
[0040] Similarly, refer to the reactive power control structure based on PI controller ( Figure 3B ), design the current limiter for reactive power control such as Figure 5 The upper limit limiter is to calculate the error between the reactive power of the unit and the upper limit of the reactive power operation under the current working conditions through the PI controller. After that, the current upper limit of the reactive power control loop is output; the lower limit limiter is the error between the reactive power of the unit and the lower limit of the reactive power operation under the current working conditions, after passing through the PI controller, the current lower limit of the reactive power control loop is output. The input of the limiter is the reactive power Q of the unit. max , the maximum reactive power value of the unit in the current operating state q max and the minimum value q min ; The output quantity is the upper and lower limits of the output current of the reactive control loop q max_lim and q min_lim ; The gain and time constant of the PI controller are K pQlim and T iQlim .
[0041] In order to more clearly illustrate the specific construction process of the above structure, this application will illustrate the generation logic of the example one by one in the subsequent embodiments. Relevant technical personnel in the field should know that this example only provides an implementation method for constructing the above structure and does not impose any limitation on it.
[0042] The input design of the reactive power and voltage controlled current limiter of the variable speed pumped storage unit mainly considers the following factors: rotor current operation limit, stator current operation limit, reactive power limit and PQ curve limit; in one embodiment of the present application, the limiting value of the PI controller is obtained by calculating the rotor current operation limit of the unit and the current operating state of the variable speed pumped storage unit according to the parameter information of the variable speed pumped storage unit, including: the limiting value of the PI controller is obtained by calculating the maximum rotor operating current of the unit and the rotor d-axis current control target value of the variable speed pumped storage unit under the current operating state of the variable speed pumped storage unit according to the parameter information of the variable speed pumped storage unit.
[0043] Specifically, in actual work, the rotor current operation limitation mainly includes the following logic:
[0044] According to the maximum operating current i of the unit rotor provided by the variable speed pumped storage unit manufacturer rmax , and the rotor d-axis current control target value i under the current operating condition rdref , that is, the output current of the active power control outer loop, the maximum value of the reactive current i can be derived rqmax for:
[0045]
[0046] Among them, i rqmax This is the limit value of the PI controller.
[0047] In one embodiment of the present application, the input limiting data of the current limiter obtained by calculation according to the stator current operating limit of the variable speed pumped storage unit, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit includes: the input limiting data of the current limiter includes the input limiting data of the reactive control current limiter; wherein, the maximum and minimum values of the stator q-axis current are obtained according to the stator current operating limit analysis of the variable speed pumped storage unit; the input limiting information of the reactive control current limiter of the variable speed pumped storage unit is obtained according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit under the current operating state, and the PQ curve of the variable speed pumped storage unit; the input limiting data of the current limiter is obtained according to the input limiting information, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit.
[0048] Wherein, obtaining the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis includes: obtaining the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis of the doubly-fed induction motor steady-state equivalent circuit.
[0049] Specifically, in actual work, the stator current operating limit can refer to the steady-state equivalent circuit diagram of the doubly fed induction motor ( Figure 6 , because the equivalent circuit diagram is a prior art, it will not be described in detail here), the corresponding maximum reactive current i can be derived rqmax The maximum and minimum values of the stator q-axis current i sq1max 、i sq1min .
[0050]
[0051] When the stator current limit of the variable speed pumped storage unit provided by the manufacturer is considered, the stator q-axis current operating limit amplitude is obtained as shown in formula (3).
[0052]
[0053] Among them, i sqmax 、i sqmin is the maximum and minimum value of the stator q-axis current considering the stator operating current limit, i max_sq is the maximum value of the q-axis current of the unit stator, i min_sq =-i max_sq is the minimum value of the stator q-axis current.
[0054] In one embodiment of the present application, the input limiting information of the reactive control current limiter of the variable speed pumped storage unit is obtained by calculating according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit in the current operating state and the PQ curve of the variable speed pumped storage unit, including: obtaining a first reactive power limiting value according to the maximum and minimum values of the stator q-axis current and the terminal voltage of the variable speed pumped storage unit in the current operating state; obtaining a second reactive power limiting value according to the limiting analysis of the PQ curve of the variable speed pumped storage unit; and obtaining the input limiting information of the reactive control current limiter of the variable speed pumped storage unit through the first reactive power limiting value and the second reactive power limiting value.
[0055] Specifically, the reactive power limit can be calculated based on the terminal voltage u of the unit under the current operating state. t And stator reactive current, calculate reactive power as shown in formula (4)
[0056]
[0057] For the PQ curve limitation, the limitation of the PQ curve of the variable speed pumped storage unit can be considered to obtain the corresponding current active output P s The reactive power limit is shown in formula (4):
[0058]
[0059] The reactive power limit considering reactive power limit and PQ curve limit is shown in formula (6):
[0060]
[0061] For a clearer description, the implementation logic of the current limiter generation method of the variable speed pumped storage unit provided in the present application is shown in Table 1 below. The present application hereby makes a specific application description of the above embodiment:
[0062] Table 1
[0063] Parameter name Parameter Value Parameter name Parameter Value Rated capacity 336MVA Stator resistance 0.002pu Speed range ±7％ Stator leakage reactance 0.14pu Rated stator voltage 15.75kV Stator and rotor mutual inductance 2.7pu Rated stator current 12.32kA Rotor resistance 0.003pu Stator-rotor ratio 0.41 Rotor leakage reactance 0.18pu
[0064] Taking the parameters of a large-capacity variable-speed pumped storage unit (Table 1) as an example, the reactive voltage control current limiter of the variable-speed pumped storage unit is designed. The working conditions considered are: the unit active output is P s =0.9pu, the terminal voltage is u t =1.0pu, maximum rotor current i rmax =1.2pu, stator q-axis maximum current i max_sq =1.1pu.
[0065] First, calculate the input quantity q of the reactive power control current limiter of the variable speed pumped storage unit max and qmin , and the limit value of the PI controller. 1. Rotor current operation limit
[0066] Considering the rotor current operating limit, the maximum value of reactive current is obtained by using formula (1):
[0067] i rqmax =0.737pu,i rqmin =-0.737pu,2. Stator current operation limit
[0068] Considering the stator current operating limit, the maximum and minimum values of the stator q-axis current are obtained using equations (2) and (3):
[0069] i sqmax =0.367pu,i sqmin =-1.1pu3, reactive power limit
[0070] Considering the reactive power limitation, the reactive power limit value is obtained by using formula (4):
[0071] q 1qmax =0.366pu,q 1qmin =-1.1pu4, PQ curve limit
[0072] Considering the PQ curve limitation, the reactive power limit value is obtained by using formula (5):
[0073] q maxPQ =0.436pu,q minPQ =-0.436pu
[0074] Therefore, considering the reactive power limitation and PQ curve limitation comprehensively, the reactive power limit is obtained according to formula (6):
[0075] q max =0.366pu,q min =-0.436pu
[0076] Based on the above calculation results, Figure 3B The structure logic can obtain the reactive power control current limiter structure of the variable speed pumped storage unit under the current working condition as follows Fig. 7A and Figure 7B shown.
[0077] If the voltage limit of the generator terminal is u when the unit is running in steady state max =1.1pu,u min =0.9pu, then based on Figure 3B The structure logic corresponds to the AC excitation voltage control current limiter structure under the current working condition as follows Fig. 8A and Figure 8B shown.
[0078] Fig. 9 This is the structure diagram of the reactive voltage control of the variable speed pumped storage unit built with a conventional current limiter. Figure 2 The structural logic can be seen in Fig. 9 The output current amplitude limit of the reactive voltage control is 1.2 pu, which, compared with the time-varying amplitude-limited current limiter designed in the present invention, has actually exceeded the regulating capability range of the AC excitation system under the current operating conditions.
[0079] The present application also provides a current limiter generating device for a variable speed pumped storage unit, the device comprising a controller analysis module, an input analysis module and a construction module; the controller analysis module is used to calculate the limiting value of the PI controller according to the parameter information of the variable speed pumped storage unit, through the rotor current operating limit of the variable speed pumped storage unit and the current operating state of the variable speed pumped storage unit; the input analysis module is used to calculate the input limiting data of the current limiter according to the stator current operating limit of the variable speed pumped storage unit, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit; the construction module is used to construct a variable speed pumped storage unit reactive control current limiter and / or a variable speed pumped storage unit voltage control current limiter through the limiting value of the PI controller and the input limiting data.
[0080] In the above embodiment, the controller analysis module includes: according to the parameter information of the variable speed pumped storage unit, the maximum operating current of the unit rotor and the rotor d-axis current control target value of the variable speed pumped storage unit are used to calculate the limit value of the PI controller. The input analysis module includes a stator analysis unit and a power analysis unit; the stator analysis unit is used to obtain the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis of the variable speed pumped storage unit; the power analysis unit is used to calculate the input limit information of the reactive control current limiter of the variable speed pumped storage unit according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit in the current operation state and the PQ curve of the variable speed pumped storage unit; the input limit data of the current limiter are calculated according to the input limit information, the reactive power limit of the variable speed pumped storage unit and the reactive power operation range of the variable speed pumped storage unit.
[0081] In one embodiment of the present application, the power analysis unit includes: obtaining a first reactive power limit value based on the maximum and minimum values of the stator q-axis current and the terminal voltage of the variable speed pumped-storage unit under the current operating state; obtaining a second reactive power limit value based on the limitation analysis of the PQ curve of the variable speed pumped-storage unit; and obtaining input limiting information of the reactive control current limiter of the variable speed pumped-storage unit through the first reactive power limit value and the second reactive power limit value.
[0082] Since the principle of solving the problem by the device is similar to the current limiter generation method of the variable speed pumped storage unit, the implementation of the device can refer to the implementation of the current limiter generation method of the variable speed pumped storage unit, and the repeated parts will not be repeated.
[0083] The present application also provides a current limiter generated by the current limiter generation method of the variable speed pumped storage unit mentioned above, the current limiter includes a reactive control loop module and a voltage control loop module; the reactive control loop module includes an upper power limiter and a lower power limiter; the upper power limiter is used to provide the error between the reactive power of the unit and the upper reactive power operating limit under the current working condition to the PI controller for processing, so as to obtain the upper current limit of the reactive control loop; the lower power limiter is used to provide the error between the reactive power of the unit and the lower reactive power operating limit under the current working condition to the PI controller for processing, so as to obtain the lower current limit of the reactive control loop; the voltage control loop module includes an upper voltage limiter and a lower voltage limiter; the upper voltage limiter is used to provide the error between the operating voltage of the unit and the upper voltage operating limit during steady-state operation to the PI controller for processing, so as to obtain the upper current limit of the voltage control loop; the lower voltage limiter is used to provide the error between the operating voltage of the unit and the lower voltage operating limit during steady-state operation to the PI controller for processing, so as to obtain the lower current limit of the voltage control loop. Based on the current limiter implementation logic already mentioned above Figure 3B and Figure 4 The embodiments are described in detail and will not be repeated here.
[0084] The beneficial technical effect of the present application is that the current limiter comprehensively considers factors such as the stator current operating limit of the variable speed unit, the rotor current operating limit, the unit operating reactive power limit, the reactive power operating range (PQ power circle), etc., to achieve the output limit of reactive current that changes with the system operating conditions, has greater flexibility and reliability, and while taking into account the grid operation requirements and equipment safety, can fully tap the equipment capabilities of the AC excitation controller itself, and achieve flexible control of the AC excitation of the variable speed pumped storage unit.
[0085] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.
[0086] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.
[0087] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.
[0088] like Fig.10 As shown, the electronic device 600 may further include: a communication module 110, an input unit 120, an audio processor 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily have to include Fig.10 In addition, the electronic device 600 may also include Fig.10 For components not shown, reference may be made to the prior art.
[0089] like Fig.10 As shown, the central processor 100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processor 100 receives inputs and controls the operations of various components of the electronic device 600.
[0090] The memory 140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 100 may execute the program stored in the memory 140 to implement information storage or processing.
[0091] The input unit 120 provides input to the CPU 100. The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.
[0092] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 140 may also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 600 through the central processor 100.
[0093] The memory 140 may also include a data storage unit (data 143) for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit (driver 144) of the memory 140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).
[0094] The communication module 110 is a transmitter / receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter / receiver) 110 is coupled to the central processor 100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.
[0095] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module. The communication module (transmitter / receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide an audio output via the speaker 131 and receive an audio input from the microphone 132, thereby realizing a common telecommunication function. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 130 is also coupled to the central processor 100, so that the sound can be recorded on the local machine through the microphone 132, and the sound stored on the local machine can be played through the speaker 131.
[0096] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.
[0097] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0098] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.
[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.
[0100] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A method for generating a current limiter of a variable speed pumped storage unit, characterized in that: The method comprises: According to the parameter information of the variable speed pumped storage unit, the limit value of the PI controller is calculated through the rotor current operation limit of the variable speed pumped storage unit and the current operation state of the variable speed pumped storage unit; The input amplitude limiting data of the current limiter is obtained by calculating the stator current operating limit of the variable speed pumped storage unit, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit; A variable speed pumped storage unit reactive power control current limiter and / or a variable speed pumped storage unit voltage control current limiter are constructed by using the limit value of the PI controller and the input limit data.
2. The method for generating a current limiter of a variable speed pumped storage unit according to claim 1, characterized in that: According to the parameter information of the variable speed pumped storage unit, the limit value of the PI controller is calculated by the unit rotor current operation limit and the current operation state of the variable speed pumped storage unit, including: According to the parameter information of the variable speed pumped storage unit, the limit value of the PI controller is calculated by the maximum operating current of the unit rotor and the rotor d-axis current control target value under the current operating state of the variable speed pumped storage unit.
3. The current limiter generation method of the variable speed pumped storage unit according to claim 1, characterized in that: The input amplitude limit data of the current limiter calculated based on the stator current operating limit of the variable speed pumped storage unit, the operating reactive power limit of the variable speed pumped storage unit, and the reactive power operating range of the variable speed pumped storage unit include: The input amplitude limiting data of the current limiter includes input amplitude limiting data of the reactive power control current limiter; Among them, the maximum and minimum values of the stator q-axis current are obtained according to the stator current operation limit analysis of the variable speed pumped storage unit; The input amplitude limiting information of the reactive control current limiter of the variable speed pumped storage unit is obtained according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit in the current operating state and the PQ curve of the variable speed pumped storage unit; The input amplitude limiting data of the current limiter is obtained by calculation according to the input amplitude limiting information, the operating reactive power limit of the variable speed pumped storage unit and the reactive power operating range of the variable speed pumped storage unit.
4. The method for generating a current limiter of a variable speed pumped storage unit according to claim 3, characterized in that: The maximum and minimum values of the stator q-axis current obtained according to the stator current operation limit analysis include: The maximum and minimum values of the stator q-axis current are obtained by analyzing the stator current operating limit according to the steady-state equivalent circuit of the doubly-fed induction motor.
5. The method for generating a current limiter of a variable speed pumped storage unit according to claim 3, characterized in that: The input amplitude limiting information of the reactive control current limiter of the variable speed pumped storage unit is obtained by calculating the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit in the current operating state, and the PQ curve of the variable speed pumped storage unit, including: The first reactive power limit value is obtained by calculating the maximum and minimum values of the stator q-axis current and the terminal voltage of the variable-speed pumped-storage unit in the current operating state; The second reactive power limit value is obtained according to the limitation analysis of the PQ curve of the variable speed pumped storage unit; The input limiting information of the reactive control current limiter of the variable speed pumped storage unit is obtained through the first reactive power limiting value and the second reactive power limiting value.
6. A current limiter generating device for a variable speed pumped storage unit, characterized in that: The device comprises a controller analysis module, an input analysis module and a construction module; The controller analysis module is used to calculate the limit value of the PI controller according to the parameter information of the variable speed pumped storage unit, the rotor current operation limit of the variable speed pumped storage unit and the current operation state of the variable speed pumped storage unit; The input analysis module is used to calculate the input limit data of the current limiter according to the stator current operation limit of the variable speed pumped storage unit, the reactive power limit of the variable speed pumped storage unit, and the reactive power operation range of the variable speed pumped storage unit; The construction module is used to construct a variable speed pumped storage unit reactive power control current limiter and / or a variable speed pumped storage unit voltage control current limiter through the limit value of the PI controller and the input limit data.
7. The current limiter generating device of the variable speed pumped storage unit according to claim 6, characterized in that: The controller analysis module comprises: obtaining the limiting value of the PI controller by calculating the maximum operating current of the unit rotor and the rotor d-axis current control target value under the current operating state of the variable speed pumped storage unit according to the parameter information of the variable speed pumped storage unit.
8. The current limiter generating device of the variable speed pumped storage unit according to claim 6, characterized in that: The input analysis module includes a stator analysis unit and a power analysis unit; The input amplitude limiting data of the current limiter includes input amplitude limiting data of the reactive power control current limiter; The stator analysis unit is used to obtain the maximum and minimum values of the stator q-axis current according to the stator current operation limit analysis of the variable speed pumped storage unit; The power analysis unit is used to calculate the input limiting information of the reactive control current limiter of the variable speed pumped storage unit according to the maximum and minimum values of the stator q-axis current, the terminal voltage of the variable speed pumped storage unit in the current operating state and the PQ curve of the variable speed pumped storage unit; and calculate the input limiting data of the current limiter according to the input limiting information, the operating reactive power limit of the variable speed pumped storage unit and the reactive power operating range of the variable speed pumped storage unit.
9. The current limiter generating device of the variable speed pumped storage unit according to claim 8, characterized in that: The power analysis unit includes: obtaining a first reactive power limit value according to the maximum and minimum values of the stator q-axis current and the terminal voltage of the variable speed pumped storage unit in the current operating state; obtaining a second reactive power limit value according to the limitation analysis of the PQ curve of the variable speed pumped storage unit; and obtaining input limiting information of the reactive control current limiter of the variable speed pumped storage unit through the first reactive power limit value and the second reactive power limit value.
10. A current limiter generated by the current limiter generation method of a variable speed pumped storage unit according to any one of claims 1 to 5, characterized in that: The current limiter comprises a reactive power control loop module and a voltage control loop module; The reactive power control loop module comprises an upper power limiter and a lower power limiter; The power upper limit limiter is used to provide the error between the reactive power of the unit and the reactive power operating upper limit under the current working condition to the PI controller for processing, so as to obtain the current upper limit of the reactive control loop; The power lower limit limiter is used to provide the error between the reactive power of the unit and the reactive power operation lower limit under the current working condition to the PI controller for processing, so as to obtain the current lower limit of the reactive control loop; The voltage control loop module includes an upper voltage limiter and a lower voltage limiter; The voltage upper limit limiter is used to provide the error between the unit operating voltage and the voltage operating upper limit during steady-state operation to the PI controller for processing, so as to obtain the current upper limit of the voltage control loop; The voltage lower amplitude limiter is used to provide the error between the unit operating voltage and the voltage operating lower limit during steady-state operation to the PI controller for processing, so as to obtain the current lower limit of the voltage control loop.
11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 5 is implemented.
12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.
13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.