CN104730457A - Power distributary and conflux wind power generation test system simulating full-natural working conditions - Google Patents

Abstract

The invention discloses a power distributary and conflux wind power generation test system simulating full-natural working conditions. The system comprises a simulation motor, a speed reducer, a planet gear row, a constant-speed generator, an adjustable-speed motor, a frequency converter, a control system and an alternating-current variable-frequency adjustable-speed drive cabinet. The planet gear row comprises a gear ring, a sun wheel, a planet carrier and a reduction gear. The simulation motor is connected with the planet carrier of the planet gear row through a first shaft and the reduction gear. A rotor of the adjustable-speed motor is connected with the sun gear of the planet gear row through a second shaft. A rotor of the constant-speed generator is connected with the gear ring of the planet gear row through a third shaft. A three-phase winding is arranged in a stator of the adjustable-speed motor and electrically connected with a power grid through the frequency converter. A three-phase winding is arranged on a stator of the constant-speed generator and electrically connected with the power grid. The frequency converter is electrically connected with the alternating-current variable-frequency adjustable-speed drive cabinet through a circuit. The system has the advantages of being easy to operate, low in cost, reliable in operation, high in efficiency and the like.

Description

Power splitting and confluence wind power generation test system simulating all natural working conditions

technical field

The invention relates to a power generation testing system, which is a power splitting and converging wind power generation testing system simulating all natural working conditions.

Background technique

The increasing shortage of energy is a problem faced by all countries in the world today. Renewable energy, with its inexhaustible, non-polluting, and non-destructive advantages, will surely play a major role in the sustainable development of human society in the future. Wind energy, as a relatively practical renewable energy, will be vigorously developed and utilized. Actively promoting wind power generation technology is to optimize energy structure, ensure energy security, alleviate serious environmental pollution caused by energy utilization, and promote energy and economy, energy An important choice for coordinated development with the environment is energy conservation in construction. Environmentally friendly society and an important way to achieve sustainable development.

As we all know, wind power is an unstable power source, and the wind speed often changes; while wind power generators are connected to the grid, the frequency of wind power is required to remain constant. In order to solve the contradiction between wind speed and wind power frequency, various solutions have been proposed, among which the variable speed and constant frequency power generation method is the most effective, so as to realize the corresponding variable speed operation of wind turbines under different wind speeds and efficiently capture the maximum wind energy.

At present, the wind power generation technologies with variable speed and constant frequency mainly include induction generator type, doubly-fed generator type, permanent magnet direct drive generator type and so on. Although high-efficiency power generation schemes emerge in endlessly, there is no report on a simple, portable and integrated power generation test system, which makes the early development and later performance verification and improvement of wind power technology difficult to carry out efficiently, thus limiting the development of wind power technology. Therefore, it is particularly important to develop a wind power generation test system with the advantages of simple and convenient operation, low cost, reliable operation and high efficiency.

Contents of the invention

Aiming at the problem that the detection system of the wind power generation system based on the power splitting and confluence technology is vacant, the present invention provides a detection system of the wind power generation system.

In order to achieve the purposes of simple and convenient operation, low cost, reliable operation and high efficiency, the specific implementation scheme of the present invention is as follows:

Power split-flow wind power generation test system simulating all natural working conditions, including simulated motor, reduction gear and planetary gear train, fixed-speed generator, speed-regulating motor, frequency converter, control system and AC variable-frequency speed-regulating drive cabinet; planetary gear train Including ring gear, sun gear, planet carrier and reduction gear; the analog motor is connected to the planet carrier of the planetary gear row through the first shaft and the reduction gear; the rotor of the speed-adjusting motor is connected to the sun gear of the planetary gear row through the second shaft, and the speed is fixed The rotor of the motor is connected to the ring gear of the planetary gear row through the third shaft; the three-phase winding in the stator of the speed-regulating motor is electrically connected to the power grid through the frequency converter; the three-phase winding in the stator of the fixed-speed generator is electrically connected to the power grid; The circuit is electrically connected to the AC variable frequency speed regulating drive cabinet; the AC variable frequency speed regulating drive cabinet is electrically connected to the analog motor through the circuit; the AC variable frequency speed regulating drive cabinet is electrically connected to the control system through a data cable; the AC variable frequency speed regulating drive cabinet is externally connected to the power grid.

The simulated motor is used as a prime mover, and the prime mover is an electric motor, an internal combustion engine, a steam turbine or a water turbine, and its power comes from an AC variable frequency speed regulation drive cabinet.

The simulated motor is a wound three-phase asynchronous motor or a squirrel-cage three-phase asynchronous motor, and the fixed-speed generator and speed-regulating motor are a synchronous motor, a squirrel-cage three-phase asynchronous motor, a wound three-phase asynchronous motor or a single-phase AC motor.

The frequency converter is an AC-AC converter, an AC-DC-AC converter or a DC-AC converter.

The fixed-speed generator and the frequency converter are electrically connected to the AC variable-frequency speed-regulating drive cabinet and they are the same interface.

The inverter and the stator of the speed-regulating motor are electrically connected through a slip ring, and the connection method is a contact brush-slip ring method. There is a power interface on the inverter and it needs to be connected to a DC power supply. group or DC generator.

The transmission types of shaft one connecting the analog motor to the reduction gear and shaft two connecting the rotor of the speed-regulating motor to the rotor of the speed-regulating motor are gear transmission, stepless mechanical transmission, hydraulic transmission, hydraulic transmission or electric transmission. The AC variable frequency speed regulation drive cabinet is connected to the power grid, and the power grid is connected to the non-adjustable power module that can convert the grid voltage into DC voltage through the power reactor.

The non-adjustable power module of the AC variable frequency speed control drive cabinet is connected to the motor module through the DC bus. The motor module acts as a reversible inverter to convert the DC voltage back to the AC voltage or convert the AC voltage into a DC voltage; each motor module is connected to the DC bus in parallel. above; connect a sinusoidal filter at the output of the Motor Module and a motor reactor at the output of the Smart Line Module.

Each motor module in the AC variable frequency speed regulation drive cabinet is respectively connected with the analog motor and generator through circuit connection.

The present invention has the following beneficial effects: the system has the advantages of simple and convenient operation, low cost, reliable operation, and high efficiency. The new test method derived from the invention can face other wind power generation systems.

Description of drawings

Fig. 1 is the scheme schematic diagram of the power split confluence wind power generation test system of the simulation full natural working condition of the present invention;

1-analog motor, 2-reduction device and planetary gear row, 20-reduction gear, 21-sun gear, 22-planet carrier, 23-ring gear, 3-fixed speed generator, 31-fixed speed generator stator, 32 -fixed speed motor rotor, 4-speed regulating motor, 41-speed regulating motor stator, 42-speed regulating motor rotor, 5-frequency converter, 6-first shaft, 7-second shaft, 8-third shaft, 9 -Power grid, 10-control system, 11-AC frequency conversion speed regulation drive cabinet;

Fig. 2 is the working principle diagram of the power splitting and converging wind power generation testing system of the simulation full natural working condition of the present invention;

The codes of each part in the figure are the same as those in Figure 1;

Fig. 3 is a schematic diagram of the structure of the AC variable frequency speed regulating drive cabinet in the power splitting and converging wind power generation test system simulating all natural working conditions;

1, 18 is a DC power supply, 19 is a data cable, 20 is an analog motor connection, 21 is a generator and a frequency converter feedback connection, 22 is a control unit, and 23 is an external power supply connection.

Among them, the same codes as those in Figure 1 and Figure 3 are the same as those in Figure 1 or Figure 3; 12 is the power reactor, 13 is the non-regulated power module, 14 is the motor reactor, 15 is the DC bus, 16 is the sinusoidal filter, 17 is motor module.

Detailed ways

In order to make the purpose and technical solution of the present invention more intuitive and clear, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The schematic diagram of the general structure of the wind power generation test system based on dual-rotor motors is shown in Figure 1, which mainly consists of a simulated motor 1, a reduction device and a planetary gear row 2, a fixed-speed generator 3, a speed-adjustable motor 4, a frequency converter 5, and a control system 10 and AC variable frequency speed regulation drive cabinet 11; planetary gear row 2 includes ring gear 23, sun gear 21, planetary carrier 22, reduction gear 20; analog motor 1 passes first shaft 6 and reduction gear 20 and planetary carrier 22 of planetary gear row Connection; the speed-regulating motor rotor 42 is connected with the sun gear 21 of the planetary gear row through the second shaft 7, and the fixed-speed motor rotor 32 is connected with the ring gear 23 of the planetary gear row through the third shaft 8; The phase windings are connected to the power grid 9 through the frequency converter 5; the three-phase windings on the stator 31 of the fixed-speed generator are directly connected to the power grid 9; It is connected with the analog motor 1 through a circuit; the AC variable frequency speed regulation drive cabinet 11 is connected with the control system 10 through a data cable; When the whole system starts to run, a wind power simulation system is randomly selected through the control system 10, and the control system 10 transmits the simulation signal in this system to the control unit 22 of the AC variable frequency speed regulation drive cabinet 11 through the data cable 22, and the 22, the analog signal is transmitted to the corresponding motor module 17 to control the operation of the corresponding motor. After the AC variable frequency speed regulation drive cabinet 11 is started, the 24V DC power supply 18 supplies power to the control unit 22, and the control unit 22 controls the connection of the non-regulated power supply module 13, and the AC variable frequency speed regulation drive cabinet 11 receives from the grid 9 Electric energy, the input electric energy reaches the unregulated power supply module 13 after being processed by the power reactor 12 , wherein the power reactor 12 plays a role of limiting the low-frequency power supply and lightening the semiconductor load in the power module 13 . The non-regulated power module 13 converts the input AC voltage into a DC voltage, and the output DC current of the non-regulated power module 13 is processed by the motor reactor 14 and then sent to the DC bus 15 . The motor module 17 receiving the instruction from the control unit 22 receives corresponding electric power from the DC bus 15 according to the analog signal, and at the same time, the motor module 17 acts as an inverter to reconvert the DC voltage into an AC voltage, and the electric power output by the motor module 17 passes through the sinusoidal filter 16 After processing, it is sent to the simulation motor 1, so that the simulation motor 1 rotates at a corresponding speed according to the signal of the wind simulation system, so as to achieve the purpose of truly simulating natural wind. Due to the function of the non-regulated power supply module 13 to convert AC power into DC power, and at the same time, the motor module 17 can realize the mutual conversion of DC and AC, the analog motor 1 and the generator 3 are connected in parallel to the DC bus 15 through the motor module 17, so that the The analog motor 1 used as a motor and the generator 3 driven by the analog motor 1 can circulate energy through the DC bus 15, so as to achieve the purpose of energy saving and environmental protection. At the same time, the energy between each part is transformed into a DC current In the form of recycling, the purpose of frequency conversion speed regulation can be easily and efficiently realized.

The core of the power splitting and converging device is a planetary gear row composed of a sun gear, a ring gear, and several planetary gears installed on the planet carrier. For a two-degree-of-freedom single planetary row, the rotational speed characteristic equation between each element is as follows:

n _t +Kn _q -(1+K)n _j ＝0

n _t is the speed of the sun gear, n _q is the speed of the ring gear, n _j is the speed of the planet carrier, K is the ratio of the number of teeth of the single planetary ring gear to the number of teeth of the sun gear, which is called the characteristic parameter of the planetary row.

The rotational speed relation of single planetary row is a ternary linear homogeneous equation, one equation, and three unknowns, which reflects that the single planetary row is a two-degree-of-freedom mechanism.

When the speed of the prime mover increases, the speed of the planetary carrier n _j increases by Δn; if the speed of the speed-regulating motor is adjusted accordingly, the speed of the sun gear n _t decreases by (1+K) Δn, the speed of the ring gear n _q can still be maintained constant. When the speed of the prime mover decreases, on the contrary, the speed of the servo motor is increased to keep the speed of the generator constant. This enables the generator to run stably at the synchronous speed point under different prime mover speed conditions.

Because the speed of each shaft of the planetary gear set can be adjusted arbitrarily, the speeds of the power machine, the fixed-speed generator and the speed-regulating motor can be coordinated with each other. The velocity of either can be expressed in terms of the other two. In this way, according to the design requirements, the speed of the power runner is time-varying, and the speed of the constant-speed motor remains constant. Correspondingly, variable-speed constant-frequency grid-connected power generation can be realized only by adjusting the speed of the motor. In the case of optimal combination, 85% of the input power of the system acts directly on the generator, while 15% flows through the servo speed-adjusting motor.

The power splitting and converging wind power generation test system simulating all natural working conditions provided by this patent has the advantages of simple operation, low cost, reliable operation and high efficiency.

As the popularization and use of the present invention, the application of the present invention is not limited to the above-mentioned narration example, for those of ordinary skill in the field of wind power generation, according to different use requirements and characteristics, the specific implementation scheme of the use of the new model can be complicated according to the actual situation. simplification or simplification, the present invention can be applied to any wind power generation test system similar to this scheme, or in various derivative schemes derived from the basic type of this scheme, all these improvements and transformations should belong to the appended rights of the present invention within the scope of protection required.

Claims (10)

1. simulate the power split wind-power electricity generation test macro of complete natural operating mode, it is characterized in that, comprise simulated machine (1), reduction gear and epicyclic gear train (2), constant speed generator (3), buncher (4), frequency converter (5), control system (10) and ac variable frequency speed regulation and drive cabinet (11); Epicyclic gear train (2) comprises gear ring (23), sun gear (21), planet carrier (22) and reduction gearing (20); Simulated machine (1) is connected with the planet carrier (22) of epicyclic gear train by the first axle (6) and reduction gearing (20); Buncher rotor (42) is connected with the sun gear (21) of epicyclic gear train by the second axle (7), and constant-seed motor rotor (32) is connected with the gear ring (23) of epicyclic gear train by the 3rd axle (8); Arrange three-phase windings in buncher stator (41) to be electrically connected with electrical network (9) by frequency converter (5); Constant speed generator unit stator (31) is arranged three-phase windings to be electrically connected with electrical network (9); Frequency converter (5) drives cabinet (11) to be electrically connected by circuit and ac variable frequency speed regulation; Ac variable frequency speed regulation drives cabinet (11) to be electrically connected with simulated machine (1) by circuit; Ac variable frequency speed regulation drives cabinet (11) to be electrically connected with control system (10) by data cable; Ac variable frequency speed regulation drives cabinet (11) outside electric power network (9).

2. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 1, it is characterized in that, simulated machine (1) is as prime mover, described prime mover is motor, internal combustion engine, steam turbine or the hydraulic turbine, and its power resources drive cabinet (11) in ac variable frequency speed regulation.

3. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 1, it is characterized in that, simulated machine (1) is Wound-rotor type threephase asynchronous machine or squirrel-cage threephase asynchronous machine, and constant speed generator (3) and buncher (4) are synchronous motor, squirrel-cage threephase asynchronous machine, Wound-rotor type threephase asynchronous machine or load motor.

4. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 1, it is characterized in that, described frequency converter (5) is A-A transducer, ac-dc-ac transform device or straight-AC-AC converter.

5. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 1, it is characterized in that, constant speed generator (3) and frequency converter (5) drive cabinet (11) to be electrically connected with ac variable frequency speed regulation and it is same interface.

6. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 1, it is characterized in that, frequency converter (5) and buncher stator (41) are electrically connected by slip ring, its connected mode is contact brush-slip ring mode, frequency converter (5) has power interface and needs to access direct supply, described direct supply is accumulator, electric battery or Dyn..

7. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 1, it is characterized in that, the actuation types of the axle one (6) that simulated machine (1) is connected with reduction gearing (20) and the axle two (7) that buncher rotor (42) is connected with buncher rotor (42) is gear drive, stepless mechanical transmission, hydrostatic transmission, hydrodynamic drive or Electrified Transmission.

8. according to any claim of claim 1-7, simulate the power split wind-power electricity generation test macro of complete natural operating mode, it is characterized in that, ac variable frequency speed regulation drives cabinet (6) outside electric power network (9), and electrical network (9) is connected with the non-modulated type power module (16) that line voltage can be converted to DC voltage through source reactance device (15).

9. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 8, it is characterized in that, ac variable frequency speed regulation drives the non-modulated type power module (16) of cabinet (13) to be connected with motor module (20) by DC bus (18), and DC voltage to be gone back to alternating voltage as possibility of reversal device or alternating voltage is changed into DC voltage by motor module (20); Each motor module (20) is parallel on DC bus (18); Connect sinusoidal filter (19) at the output terminal of motor module (20), connect motor impedance device (17) at non-modulated type power module (16) output terminal.

10. simulate the power split wind-power electricity generation test macro of complete natural operating mode according to claim 9, it is characterized in that, each motor module (20) in ac variable frequency speed regulation driving cabinet (13) is connected by circuit and is connected with simulated machine (1) and generator (10) respectively.