JPS61102344A - Operating method of regenerative inverter - Google Patents

Abstract

PURPOSE:To aim at the promotion of smoothness in system operation, by installing a voltage distortion detector at the AC side and, when a voltage distortion exceeds the setting value, stopping the regeneration by an inverter, in case of a DC feeding type regenerative substation system. CONSTITUTION:In the case where a regenerative substation system is separated from an AC power source 100 and continues its operation with DC power out of an adjacent substation 75, impedance of AC load is large enough so that a voltage distortion exceeds the setting value, thus a voltage distortion detector 95 operates. A regenerative inverter gate is stopped with this detection output whereby a regenerative inverter fails to do its commutation whereby DC load 90 comes to a power cut. Or otherwise, a DC breaker 42 and an AC breaker 62 are opened by an output signal of the said detector, even so the AC load 90 comes to OFF as well. With this constitution, in times of power receiving and power stoppage, such a phenomenon that the regenerative inverter still continues to feed the AC load with an AC power source large in the voltage distortion is prevented from occurring.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a regenerative substation system using a DC feeding method, and relates to an operating method for detecting an abnormality in an AC power supply system and stopping the operation of a regenerative inverter. be.

[Conventional technology]

Figure 1 is a basic configuration diagram of a conventional regenerative substation system shown in, for example, Japanese Patent Publication No. 55-3180, and Figures 2 and 3 are
The figures show a control pattern and a control block diagram of the regenerative inverter, respectively.

In Fig. 1, 10 diodes 11 to 16 are used as a converter, 20 is an inverter made up of 21 to 26 diodes, 30 is a 1-current reactor for the purpose of suppressing fault current and smoothing the current, and 41.42 is a DC cutoff. 51 and 52 amps, 71 is an overhead line, 72 is a rail, 73 is a chopper car, and 100 is an AC source.

Figure 2 shows the control pattern for the converter and inverter. In the case of steel acid (1) and the control pattern (2), the inverter is set at a control angle (-γG sets the control angle to the Ashikaga side.

FIG. 3 shows an example of a block diagram of a control circuit for realizing the control pattern shown in FIG. 2. In the figure, 10, 20,
The parts indicated by 41, 42 and 71 correspond to the part of the first section number, ``Y'' is a converter, 20 is an inverter, 41 degrees 42 is a DC breaker, and 71 is an overhead wire.

81 is a voltage reference device that can adjust the inverter voltage setting value Vdi, 82 is a minimum phase reference device that can adjust the minimum inverter control angle, 89 is a voltage divider that divides the voltage, and 88 is the output voltage of the voltage divider 89. 85 is a voltage controller that controls the DC voltage of the inverter 20 at a constant voltage so that it becomes the inverter voltage setting value Vd of the voltage reference device 81, and 86 is a thyristor of the inverter 20 according to the output of the voltage controller. By providing the phase shifter 86, which determines the firing angle, with a phase function that prevents the output of a firing angle smaller than the minimum control angle value set by the minimum phase reference device 82, as shown in FIG. In the control pattern, switching between p1 areas (2), (2), (2), (2), and (2) and (2) is performed automatically.

Next, the operation will be explained.

In FIG. 1, if we consider the case where only the chopper car 73 currently exists on the route, when the chopper car 73 goes to ``K'', the power required for going to ``K'' is supplied from the converter to the route shown by the solid arrow -, and vice versa. During regenerative braking, the regenerative power is transferred to the i/verter 2 along the route shown by the dashed arrow (...-).
0. Electric 'II @ 100 via inverter transformer 52
will be regenerated.

In general, the overhead wire 71 is used not only for vehicles, but also for...
+ Connected to T-flow substation.

Further, the AC power source 100 is connected to an AC power source supplied from an electric power company or the like via an AC breaker, and to various AC sources (not shown).

Also, the control pattern shown in FIG. 2 will be explained.

111 The light range converter is operated according to the voltage fluctuation rate of the device.

(2) The inverter voltage at the zero DC current point in the bright area (■) is selected to be slightly lower than the converter voltage at the zero DC current point, so the inverter and converter operate simultaneously in the bright area (■).

Here, the inverter voltage and converter voltage are the same voltage because they are common on the DC side, and when viewed from the substation output side, the voltage and ζ full frame characteristics apparently have the characteristics shown by the broken line (...).

For example, considering the output voltage Ed in Fig. 2, the inverter current is E, the converter magnetic current is IC, and f, when viewed from the electrodeposition output side, the difference between the converter voltage IC and the inverter commercial current d, = IC-h is being supplied to the overhead lines.As explained above, from the perspective of the substation output side, the converter system is stable both in the case of "supplying first-rate to the overhead lines" and in the case of fully regenerating the first-rate from the overhead lines. Furthermore, the regeneration operation from F to F or the pick-up operation from regeneration to F is performed continuously and stably. In this bright area ■, the inverter is at the preset inverter control angle setting end γ. The control angle -° is controlled in accordance with the voltage fluctuation rate of the device. In other words, the inverter current flows from the curved side to the alternating current side, so as the inverter current increases, the inverter [
The inverter DC voltage increases at a rate of one-stream pressure fluctuation.

+3+ In the bright region ■, only the inverter operates without circulating current flowing between the converter and the inverter. The inverter is controlled by the control angle - Ashikaga with the control angle setting value γ0, as in the bright area (3).

141 In the bright region (■), the inverter is controlled at a constant voltage so that the DC voltage setting becomes 1 DC Va overnight.

f51 Switching from If area ■ to S area Q was originally done by inverter control angle rf setting ■cγ. Place the inverter so that it does not become smaller, and set the inverter to the inverter DC' turtle pressure! By performing constant voltage control so that Kj V d, self #JfFJ can be switched continuously. The inverter is operated at the minimum value γ0 of the control angle in the bright region (2) and (in the latter case), and outputs the maximum voltage for the inverter current at that time.

(6) Similarly, the switching between the song ranges (1), ('), chain acid (2), and (3) is also performed automatically and intermittently.

Conventional regenerative inverter devices are controlled to have a constant shearing angle with the minimum control angle value γ0, and the DC side receives daily current power from the l'4 contact substation through overhead wires71, so it varies depending on the load condition on the AC side. l/'i When the AC power supply is fully open, a phenomenon can be considered in which the regenerative inverter converts the DC power from the adjacent substation back into AC power and continues to supply power to the AC side load. Voltage is supplied to the load, and there are drawbacks such as commutation failure when the AC power is turned on again. This was done to completely remove the condition.
Focusing on the fact that AC control detection is large in operating conditions where the DC power from the adjacent f-electrode is inversely converted at a constant control angle to supply power to an AC load, we added a voltage distortion detection device to all conventional regenerative inverters. However, a regenerative inverter operating method is provided in which the regenerative inverter operation is completely stopped when a 1u pressure strain is detected in one or more fixed planes.

[Embodiments of the invention]

Hereinafter, a 1M example of this invention will be explained with reference to the drawings.

In Figure 4, 75 is the adjacent substation, 61, 62゜63
1 is an AC breaker, and 90 is an AC load, which is completely omitted from illustration in FIG.

95 is a voltage distortion detection device according to the present invention, which detects all cases where the voltage distortion in the AC power supply is constant (11 or more VC) and outputs a signal.

FIG. 5 shows a concrete example of the voltage distortion detection device. 95-1 is a PT connected to an AC power supply 100V, and an inverter phase control signal can be used. 95-2 is a fundamental wave suppression filter, 95-31'j band pass filter, 95-4 is a peak value comparison and holding circuit, 95-5H timer circuit,
Is the harmonic voltage distortion higher than the setting 1 as a whole, or is there a device that detects that the voltage has been distorted for more than 1 time? 7J completed.

Well, 95-3 can be just an amplifier, and 95-4
It is clear that the smoothing filter and comparator circuit work similarly.

This voltage distortion detector first operates under the stable control pattern shown in Figure 2 as before, because under normal power receiving conditions, the voltage distortion of the AC power supply is small and does not reach the set value after passing through the fundamental wave removal filter. Ru.

However, the regenerative substation system disconnects from the AC power supply.
If the operation is continued using DC power from an adjacent substation, the impedance of the AC load is large, so the voltage distortion is set to IiI! , the detector is activated.

By stopping the regenerative inverter gate based on this detector output, the regenerative inverter fails to conduct current, and the AC load 90 is interrupted.

Alternatively, by opening the DC breaker 42 and the AC breaker 62 according to the detector output signal, the AC load 9 is also opened.
0 means power outage.

〔Effect of the invention〕

As described above, according to the present invention, a voltage distortion detector is provided on the AC side, and regeneration by the inverter is stopped when the voltage distortion reaches a set value. Therefore, in the event of a power outage, the regenerative inverter applies voltage to the AC load. What is the effect of preventing the continuous supply of highly distorted AC power and ensuring smooth operation of the regenerative power station system?

[Brief explanation of the drawing]

Figure 1 is a basic configuration diagram of a conventional regenerative substation system, Figure 2
The figure shows the control pattern of the converter and inverter, Figure 3 is a price block diagram that realizes the control pattern of Figure 2, and Figure 4 is a regenerative 9-power station system with the magnetostriction detection device of the present invention added. FIG. 45 is a basic configuration diagram showing a concrete arrangement of the magnetostriction detection device of the present invention. (10) is a converter made up of diodes (II) to (161), an input/< -ta is made up of 12[1(riSirisk circle ~・2Q'), and 1301 is a DC reactor. vessel, 6υ
,・52flf pressure gauge, 6υ, 8”4, ・,631
AC breaker 1. ．． 711 is an overhead wire, I'll is a rail, 731 is a small car, ・7θ is a single-connection substation, '8
1) is a voltage standard, the column is a minimum phase standard, ・b is a 1-voltage controller, the side is a phase shifter, the state is a voltage sensor, ・89) is a voltage divider, ・91 AC load, ・噬 is a voltage distortion Detection device (9
5-1) The transformer (95-2) is a fundamental wave suppression filter,
(95-31 is a band pass filter, (95-4) i peak value comparison and holding circuit, (95-5) is a timer circuit, 1
There are 4 sources of AC. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) In a regenerative substation system that includes a converter that supplies DC power to the overhead lines of an electric railway using a DC feeding system, and an inverter that regenerates regenerative energy generated by vehicles capable of regenerative braking to the AC side, the above-mentioned AC side A method for operating a regenerative inverter, characterized in that a voltage distortion detection device is provided in the inverter, and control is performed so that regeneration from the inverter is stopped when the voltage distortion exceeds a set value. (2) The method of operating a regenerative inverter according to claim 1, wherein the regeneration from the inverter is stopped by stopping the gate pulse of the inverter (cutting off the gate). (3) Regenerative inverter operation according to claim 1, characterized in that regeneration from the inverter is stopped by opening a cutter provided on at least one of the input and output sides of the inverter. Method.