CN110829898A - Starting control method for grid connection of new energy synchronous motor - Google Patents
Starting control method for grid connection of new energy synchronous motor Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/30—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive increase of frequency of supply to primary circuit of motor
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Abstract
The invention discloses a starting control method for a new energy synchronous motor to grid connection, which is characterized by comprising the following steps of: the starting control method is based on a variable frequency starting technology, adopts an independent excitation system as an excitation power supply, utilizes an inverter as a synchronous machine motor pair to drive a frequency converter, and controls the output frequency of the frequency converter to reach 50Hz within a half minute from 0Hz in a constant voltage or frequency ratio mode; the technical problem that the power grid stability is reduced due to the fact that inertia of a high-proportion new energy power grid is reduced in the prior art is solved.
Description
Technical Field
The invention belongs to the field of operation and stability of a new energy power system, and particularly relates to a starting control method for grid connection of a new energy synchronous motor.
Background
Energy sources play an important driving role in social development. The electric power is a clean and efficient energy form and is related to the national civilization. The process of power generation is mainly a process of converting various types of primary energy into electric energy which is easy and convenient to transport and convert, and transporting and distributing the electric energy. Due to the increasingly serious environmental problems brought by the traditional fossil energy and the problem of future exhaustion of the traditional fossil energy, new energy electric power such as wind power generation, solar power generation and the like becomes an economically gradually feasible alternative energy source with unique advantages and development in recent years, and becomes a development direction of the energy electric power field which is generally accepted at present. In 2016, the newly increased installed capacity of 1930 ten thousand kilowatts of wind power in China all the year around, the accumulated grid-connected installed capacity reaches 1.49 hundred million kilowatts and accounts for 9 percent of the installed capacity of all the power generation, the generated energy of the wind power accounts for 2410 hundred million kilowatt hours and 4 percent of all the generated energy, the average utilization hours of the wind power in China are 1742 hours, the year-on-year increase is 14 hours, and the wind power abandoned amount in all the year around is 497 hundred million kilowatt hours. In 2017, 1503 ten thousand kilowatts of grid-connected wind power installed capacity are newly added, the cumulative grid-connected installed capacity reaches 1.64 hundred million kilowatts and accounts for 9.2 percent of the total power generation installed capacity. The annual wind power generation amount is 3057 hundred million kilowatt hours, which accounts for 4.8 percent of the total power generation amount, and the specific gravity is improved by 0.7 percent compared with 2016.
The new energy resource friendly to the power grid is required to have high power generation efficiency, can resist certain faults, actively participates in active power-frequency regulation of the power grid, and improves the stability of the system. When the permeability of the fan reaches 10%, the rotational inertia of the system is obviously reduced. The inertia reflects the buffer capacity of the new energy to the frequency change, and guarantees that the new energy unit has enough time to realize the adjustment of active power when the load disturbance amount is large. For new energy power generation equipment represented by photovoltaic power generation and not containing rotating motor components, a power electronic converter is connected with a power grid, and almost no inertial response exists under the current cognitive level. As shown in a certain power grid frequency response diagram in fig. 1, it can be known that as the permeability of new energy increases, the fluctuation range of the power grid frequency increases, which may threaten frequency-sensitive loads in the power grid, and also may cause a lot of grid-connected new energy to start frequency protection and then disconnect from the grid, resulting in more serious consequences.
In order to solve the above problems, many improvements have been proposed by scholars at home and abroad. Active standby control of the variable-speed wind turbine unit means that a wind power plant gives up maximum power tracking, and a part of adjustable power is reserved in the wind power plant during steady-state operation so as to participate in frequency adjustment when the frequency changes. The reserve power control strategy includes direct pitch angle reserve control and modified maximum power tracking curve control. The active output size of the variable speed wind turbine is determined by the current wind speed, the corresponding power value on the maximum power tracking curve is calculated to serve as a reference instruction for control of the converter, an active power decoupling control strategy and a reactive power decoupling control strategy are adopted, so that the rotational inertia of the wind turbine is hidden, and after a large number of wind turbines are connected into a power grid, the effective inertia of the power grid is reduced along with the increase of permeability. And researching a frequency control method of the fan, feeding the rotating speed signal back to a fan control system, and calculating to obtain a corresponding active power instruction. The instruction is added with the original power instruction to obtain a converter power reference instruction, so that the inertial support capability of the wind turbine generator set on the system frequency change is realized. The negative impact of the lack of new energy inertia on the system frequency is undoubted. In recent years, researchers have proposed a "virtual inertia" control technology, or a virtual synchronous generator technology and a synchronous converter technology, and the method simulates the rotor inertia and the system frequency modulation characteristic of synchronous power generation on the basis of an electromechanical transient model of a synchronous generator in frequency control.
The above process is also not perfect and is questionable in the following main areas: (1) whether there is a sufficient source of energy. The virtual inertia control aims at releasing energy in a fan rotor or a converter direct-current side capacitor to provide inertia, the dependence of the released energy and the frequency modulation effect on the rotating speed of the fan or the energy storage of the capacitor before disturbance occurs is high, and whether enough energy sources exist is a problem to be solved by the method; (2) reliability of frequency adjustment. In order to ensure that the rotor can recover the optimal rotating speed again after the disturbance is recovered, temporarily "borrowed" kinetic energy needs to be "returned" to the rotor, so that active power needs to be absorbed from the power grid, on one hand, the frequency recovery process of the system is lengthened, on the other hand, the power shortage of the power grid can be aggravated, and the potential risk of further reduction of the frequency exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the starting control method for the new energy synchronous motor to the grid connection is provided, and the technical problems that the stability of a power grid is reduced due to the fact that the inertia of a high-proportion new energy power grid is reduced in the prior art are solved.
The technical scheme of the invention is as follows:
a starting control method for grid connection of a new energy synchronous motor is based on a variable frequency starting technology, an independent excitation system is adopted as an excitation power supply, an inverter is used as a synchronous motor pair driving frequency converter, and the output frequency of the frequency converter is controlled to reach 50Hz within a half minute from 0Hz in a constant voltage or frequency ratio mode.
The grid-connected starting control method is applied to a new energy grid-connected system through a synchronous motor pair, wherein the grid-connected system comprises a power grid, the synchronous motor pair, an excitation power supply, new energy, a voltage source type inverter, an electrical measuring instrument and a starting switch; the pair of synchronous motors is coaxially connected by the rotors of a synchronous motor and a synchronous generator.
The starting process of the synchronous motor pair is as follows: the voltage source type inverter sends out a starting signal to switch a starting switch to K0S, the voltage source type inverter sends out a starting signal to an excitation power supply to enable the excitation power supply to be automatically started, the excitation power supply provides no-load excitation current for the synchronous motor, the voltage source type inverter detects that the excitation power supply is stable and continuously supplied with power, the given value of the output frequency of the voltage source type inverter is continuously increased from zero, the synchronous motor drives the synchronous generator to start and rotate, then the voltage source type inverter enables the synchronous motor to accelerate to a synchronous speed of 3000r/min under the condition that the output voltage and frequency ratio is kept unchanged, and when the voltage source type inverter detects that the synchronous motor stably operates at the synchronous speed, the voltage source type inverter sends out a signal to switch the starting switch to K1S, and.
The synchronous electromechanical machine satisfies the following relations for the mathematical model and the mechanical model:
in the formula: u. ofa、ub、ucRespectively three-phase stator voltage ufIs an excitation voltage, ia、ib、icRespectively three-phase stator currents ifdFor exciting current, ikdDamping the winding current, ikqFor q damping the winding current, psia,ψb,ψcFor stator winding flux,. psifTheta is the rotor position, delta is the power angle of the synchronous machine, H, K for the field winding fluxDAre respectively the inertia constant, omega, of the pair of synchronous motorsm、ΔωmRespectively the mechanical angular velocity and the difference between the mechanical and electrical angular velocity, omega, of the pair of synchronous motors0Is the electrical angular velocity, T, of the pair of synchronous machinesm、TeRespectively the mechanical torque and the electromagnetic torque of the synchronous machine.
The invention has the beneficial effects that:
the invention can not only meet the starting requirement of the synchronous motor pair, but also improve the starting stability, reduce the damage to the two synchronous motors and the shared rotating shaft and provide important technical support for the synchronous motors to the system in actual power grid engineering landing and practice. Meanwhile, the invention conforms to the physical structure characteristics of the synchronous motor pair, utilizes the inverter at the side of the synchronous motor as a starting control device, does not need to additionally increase starting auxiliary equipment, and can adjust the starting speed according to the requirements of users; the technical problems that the power grid stability is reduced due to the fact that inertia of a high-proportion new energy power grid is reduced in the prior art are solved.
Drawings
FIG. 1 is a schematic diagram of a frequency response of a power grid under different new energy permeabilities;
FIG. 2 is a schematic diagram of a main grid-connected structure of the new energy source through a synchronous motor pair according to the present invention;
fig. 3 is a schematic diagram of a starting process of the synchronous motor pair according to the present invention.
Detailed Description
The method for starting the synchronous machine motor pair of the new energy source grid-connected structure through the synchronous machine pair is different from the method for starting the auxiliary machine dragging in a variable frequency mode. The main reason for adopting this mode is determined by the mechanical structure of the synchronous motor pair, the motor side of the synchronous motor pair is connected with the inverter, and the stator side of the generator side is connected with the power grid, so that the auxiliary engine dragging motor can not be added for starting, but the starting process is similar to the auxiliary engine dragging starting mode, firstly, the output frequency of the inverter is increased from 0, and after half a minute, the output frequency reaches 50Hz, and the rotating speed of the synchronous motor is increased from 0 to 1500r/min under the driving of the frequency converter, and because the synchronous motor and the synchronous generator are coaxially connected, the rotating speed of the synchronous generator can also be increased from 0 to 1500 r/min. Different from the existing self-excitation synchronous generator, the synchronous motor adopts other excitation modes, so that the reactive power at two sides of the synchronous motor is convenient to adjust, the excitation voltage of the two synchronous motors is kept constant in the starting process of the synchronous generator, and the stable starting of the motor is facilitated.
The synchronous machine motor pair for the new energy grid-connected structure through the synchronous machine pair is characterized in that a mathematical model and a mechanical model of the synchronous machine motor pair meet the following relations:
wherein u isa、ub、ucRespectively three-phase stator voltage ufIs an excitation voltage, ia、ib、icRespectively three-phase stator currents ifdFor exciting current, ikdDamping the winding current, ikqFor q damping the winding current, psia,ψb,ψcFor stator winding flux,. psifTheta is the rotor position, delta is the power angle of the synchronous machine, H, K for the field winding fluxDAre respectively the inertia constant, omega, of the pair of synchronous motorsm、ΔωmRespectively the mechanical angular velocity and the difference between the mechanical and electrical angular velocity, omega, of the pair of synchronous motors0Is the electrical angular velocity, T, of the pair of synchronous machinesm、TeRespectively the mechanical torque and the electromagnetic torque of the synchronous machine.
As can be known from formulas (1) and (2), the mathematical models of the two motors are consistent, the stator winding and the rotor winding have strong electrical coupling relation, the excitation winding plays a role in excitation, and when the electrical parameters and the mechanical parameters of the two motors are the same, the electromagnetic change processes of the two motors are the same, so that the synchronous motor drags the synchronous generator to stably achieve synchronous speed, and the beneficial guarantee is provided.
From the formulas (3) and (4), the power angle change rate and the rotation speed difference Δ ω of the synchronous motor can be knownmProportional ratio, when the output frequency of the inverter slowly and stably increases according to a certain proportion, the rotating speed difference delta omegamIncrease according to equal proportionAs can be seen from the formula (3), the power angle change rate of the synchronous motor is basically kept unchanged, so that the torque change of the synchronous motor is relatively gentle, and the synchronous motor pair can be started stably.
The grid-connected starting control method is applied to a new energy grid-connected system through a synchronous motor pair, as shown in figure 2, the grid-connected system is composed of a power grid 10, a synchronous motor pair 11, an excitation power supply 141, new energy (20), a voltage source type inverter 211, an electrical measuring instrument 216 and a starting switch 118, the synchronous motor pair 11 is coaxially connected through a synchronous motor 120 and a rotor of a synchronous generator 130, and the starting control method is suitable for new energy
The starting process of the synchronous motor pair 11 is as follows: the voltage source type inverter 211 sends out a starting signal to switch the starting switch 118 to K0, S, the voltage source type inverter 211 sends out a starting signal to the excitation power supply 141 to enable the excitation power supply 141 to be automatically started, the excitation power supply 141 provides no-load excitation current for the synchronous motor 120, the voltage source type inverter 211 detects that the excitation power supply 141 stably and continuously supplies power, the given value of the output frequency of the voltage source type inverter 211 is slowly and continuously increased from zero, the synchronous motor 120 drives the synchronous generator 130 to start and rotate, then the voltage source type inverter 211 enables the synchronous motor 120 to accelerate to a synchronous speed of 3000r/min under the condition that the output voltage and frequency ratio is kept unchanged, when the voltage source type inverter 211 detects that the synchronous motor 120 stably operates at the synchronous speed, the starting switch 118 is switched to K1, S, and starting is completed.
Claims (4)
1. A starting control method for grid connection of a new energy synchronous motor is characterized by comprising the following steps: the starting control method is based on a variable frequency starting technology, adopts an independent excitation system as an excitation power supply, utilizes an inverter as a synchronous machine motor pair to drive a frequency converter, and controls the output frequency of the frequency converter to reach 50Hz within a half minute from 0Hz in a constant voltage or frequency ratio mode.
2. The starting control method for the grid-connected mode of the new energy synchronous motor according to claim 1, characterized in that: the grid-connected starting control method is applied to a new energy grid-connected system through a synchronous motor pair, and the grid-connected system comprises a power grid (10), the synchronous motor pair (11), an excitation power supply (141), new energy (20), a voltage source type inverter (211), an electrical measuring instrument (216) and a starting switch (118); the synchronous motor pair (11) is coaxially connected by a synchronous motor (120) and the rotor of a synchronous generator (130).
3. The starting control method for the grid-connected mode of the new energy synchronous motor according to claim 2, characterized in that: the starting process of the synchronous motor pair (11) is as follows: the voltage source type inverter (211) sends a starting signal to switch a starting switch (118) to (K0, S), the voltage source type inverter (211) sends a turn-on signal to an excitation power supply (141) to automatically turn on the excitation power supply, the excitation power supply (141) provides no-load excitation current for the synchronous motor (120), the voltage source type inverter (211) detects that the excitation power supply (141) is stable and continuously supplied, the given value of the output frequency of the voltage source type inverter (211) is continuously increased from zero, the synchronous motor (120) drives the synchronous generator (130) to start and rotate, then the voltage source type inverter (211) accelerates the synchronous motor (120) to a synchronous speed of 3000r/min under the condition that the output voltage and frequency ratio is kept unchanged, and when the voltage source type inverter (211) detects that the synchronous motor (120) stably operates at the synchronous speed, the voltage source type inverter (211) sends a signal to switch the starting switch (118) to (K1), s), the starting is completed.
4. The starting control method for the grid-connected mode of the new energy synchronous motor according to claim 1, characterized in that: the synchronous electromechanical machine satisfies the following relations for the mathematical model and the mechanical model:
in the formula: u. ofa、ub、ucRespectively three-phase stator voltage ufIs an excitation voltage, ia、ib、icRespectively three-phase stator currents ifdFor exciting current, ikdDamping the winding current, ikqFor q damping the winding current, psia,ψb,ψcFor stator winding flux,. psifTheta is the rotor position, delta is the power angle of the synchronous machine, H, K for the field winding fluxDAre respectively the inertia constant, omega, of the pair of synchronous motorsm、ΔωmRespectively the mechanical angular velocity and the difference between the mechanical and electrical angular velocity, omega, of the pair of synchronous motors0Is the electrical angular velocity, T, of the pair of synchronous machinesm、TeRespectively the mechanical torque and the electromagnetic torque of the synchronous machine.
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| CN112271757A (en) * | 2020-11-18 | 2021-01-26 | 华北电力大学 | Method for improving operation stability of new energy synchronous motor to grid-connected system |
| CN112886631A (en) * | 2020-02-29 | 2021-06-01 | 贵州电网有限责任公司 | MGP new energy grid-connected control method and system |
| CN113328446A (en) * | 2020-02-28 | 2021-08-31 | 贵州电网有限责任公司 | Method and system for improving operation stability of new energy synchronous motor pair |
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