JPH0197184A - Starting method - Google Patents

Abstract

PURPOSE:To reduce capacity of a starting device, by accelerating an AC excited synchronous machine upto 80% of rated speed through the starting device then throwing the synchronous machine into a system thereafter accelerating the synchronous machine upto the rated speed through a cyclo-converter. CONSTITUTION:At first, a disconnecting switch and a, starting disconnecting switch 19 at M side of a phase inverting disconnecting switch 10 are closed, then a circuit breaker 12 is thrown-in based on a starting command to accelerate a reversible pump turbine 3 in the water. Then a cyclo-converter 6 is controlled to accelerate an AC excited synchronous machine up to 80% of rated speed. Upon reaching to 80% of rated speed, the cyclo-converter 6 is restricted temporarily to open the starting disconnecting switch 19. Thereafter, the cyclo- converter 6 is operated again and arranged speed control is made, then a circuit breaker 9 is thrown in synchronously. Furthermore, the AC excited synchronous machine is accelerated upto the rated speed through a rotation controller 20.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides automatic frequency control (hereinafter referred to as AFC) during pumping operation.
[abbreviated as]] relates to a pumped storage power generation device with an increased adjustment range, and particularly to a method for starting the same.

[Conventional technology]

In general, recent electric power systems are experiencing a shortage of AFC# adjustment capacity during late night hours due to the increase in the ratio of rjkf power and the increase in the number of die-starts and stops of thermal power.As a response to this, input adjustment of pumped storage power plants has become essential. here,
Figure 2 shows a simple principle diagram of KcIT variable speed pumping. In the figure, (1) is the electric current of the AC excited synchronous machine (hereinafter abbreviated as Al5M), and (2) is the rotor (secondary coil/
L/ ), (3) is a reversible pump turbine, (4) is a shaft, (5) is a cycloconverter transformer, (6)
is a cycloconverter (hereinafter abbreviated as C70).
, (7) is a rotation speed detector, and (8) is a rotation speed controller. Here, in order to operate the reversible pump water turbine (3) at variable speed, a method of secondary excitation of the above-mentioned 9AESM is normally adopted. Therefore, even if the rotation speed changes, parallel operation with the grid is possible by adjusting the frequency of secondary excitation to match the grid frequency.As a single frequency converter, a cycloconverter that directly converts alternating current to alternating current is possible. method is usually used.

Next, an example of a conventional starting method will be explained with reference to FIG.

In the figure, (1) is the fixed position of the AESM, and (2) is the fixed position of the AESM.
SM (1) rotation chi, (6) is C70, (5) is C/
C ash pressure generator, (9) is a generator breaker, (1O) is a phase inverter for switching the operation mode of the AESM, which is a reversible generator motor, (11) is a live transformer, (12) is a C/
breaker for C, (13) is a new circuit for starting, (14) is a starting transformer, (15) is a breaker for starting, (16) is for C
A new circuit for /C, (17) was released in April as a liquid resistance disconnector, (1
8) is a starting liquid resistor.

Next, the operation will be explained.

The pumping direction new route unit (M side) of the phase reversing new route unit (10) is turned on, and the new route units (13), (16) + (17) are turned on, and the reversible pump turbine is first activated by the start command. (3
), press down the water level, throw in the mustard cutter (15), and start the engine. Accelerate by operating the starting liquid resistor (18), and when it accelerates to near the synchronous speed, the circuit breaker (15),
Open the new circuit (17), turn on the breaker (12), control C70 (6) to perform uniform speed control, and control the breaker (12).
9) to synchronize. Next, after exhausting the air for pushing down the water surface, the pumping pressure is established, the guide vanes are opened, and pumping operation begins.

[Problem that the invention seeks to solve]

Conventional OL''L speed generators were configured as described above, and controls related to starting were performed, so a compressed air compressor was required to push down the water surface when starting pumped water, and the secondary side of A11m5M was required at the time of starting. The problem was that a liquid resistor had to be installed in the engine, the capacity of the starting device had to be increased, and the operation was complicated and uneconomical.

This invention has been made to solve the above-mentioned problems, and aims to provide economical AP'C adjustment during pumping operation by devising a starting method and making it possible to perform CLT function.

[Means for Solving the Problems] The starting method according to the present invention includes rounding to prevent the acceleration torque from increasing and the capacity of the starting device to increase when the starting device accelerates to near the synchronous speed. Adjust the KAESM of low speed rotation from C70K and connect it in parallel to the system,
The AKSM accelerates the engine to the rated speed and controls the engine to establish buffing water pressure, reducing the burden on the starting device.

[Function J] The starting method in this invention is such that the acceleration at the time of starting is controlled by, for example, C
If the normal variable speed range of 70 is ±2096 of the rated speed, accelerate with the starter until 80% of the rated speed. The acceleration of the reversible pump-turbine using the starter requires only a capacity corresponding to the loss torque at 80% rotation. Also, since the loss)/L/r is proportional to about the third power of the rotational speed, the capacity of the starting device is about half that of the conventional method of accelerating to near the rated speed, making it possible to start underwater.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG.

In FIG. 1, the same reference numerals as in FIG. 3 indicate the same or equivalent parts.

In the figure, (19) is a starting disconnector, and (2o) is a rotation speed controller.

In Fig. 1, first close the M side disconnector of the phase inversion new circuit switch (10) and the starting new circuit switch (19), then turn on the breaker (12) with a starting command and press down the water surface. Instead, the reversible pump turbine (3) is accelerated underwater. Then c/c (
6) to control the AEEIM, for example 8096 at the rated speed.
accelerate to. When accelerated by so*1, c/c (6
), then set the AESM to no voltage and open the new starting device (19). Operate C70 (6) again to perform uniform speed control and turn on synchronization from cutoff (9)K. Furthermore, the rotation speed controller (20) accelerates the AESM to the rated speed to establish pumping water pressure, and the guide vanes are opened to begin pumping operation.

In addition, in the above embodiment, the case where the beam reverse type Bonde turbine (3) is started in water has been explained, but it may also be started in the air as in the conventional case, and furthermore, the case where it is accelerated at C70 (6) will be explained. However, even when accelerating with a liquid resistor, the capacity of the liquid resistor can be reduced, so that the same effect as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, the starting device accelerates in parallel with system M at a speed lower than the rated speed, and then accelerates to the rated speed with the AESM to establish the pumping water pressure. Yong Jl: It has the effect of being economical and simple.

[Brief explanation of the drawing]

Fig. 1 is a single line diagram showing an embodiment of the starting circuit of the town speed pump according to the present invention; Fig. 2 is a logic diagram of the variable speed pump;
The figure is a single line diagram showing an example of a starting circuit of a conventional variable speed pumped storage power plant. In the figure, (1) is the fixed chain of the AC excited synchronous machine, (2)
is its rotor, (3) is a reversible pump turbine, (6) is a cycloconverter, (19) is a new starting device, (20)
is the rotation speed controller. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a method for starting a pumped storage power generation system configured to perform variable speed operation by controlling the secondary side of an AC-excited synchronous machine directly connected to a reversible pump-turbine using a cycloconverter, the cycloconverter can be controlled at the time of pumped storage startup. The AC-excited synchronous machine is connected to the system by accelerating to a speed lower than the lower limit synchronous speed, and then the rotation speed is gradually increased to the synchronous speed by the AC-excited synchronous machine, and priming is performed. A starting method characterized by establishing pressure, opening the guide vanes and entering pumping operation.