JPS62272835A - Method of controlling superconducting energy storage apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a control method for a superconducting energy storage device,
T flows into the superconducting energy storage bag # from the special vC current transformation system.
Control method for superconducting energy storage device suitable for high-speed control of effective and reactive overpowering force P [Prior art] Superconducting energy storage device has super! It controls the active and reactive power of an AC system using the energy storage function of the four coils, and is used as a system stabilization device. In order to stabilize the AC system with this system, superconducting energy has been stored from the AC system in response to active and reactive power command values from the system control device, as described in a paper at the 1981 National Conference of the Institute of Electrical Engineers of Japan. 1 [The active and reactive power flowing into 1t was controlled in a closed loop.

However, in order to stably perform closed-loop control, it is necessary to provide a function circuit with a time constant in the loop of the closed-loop control system, which makes it impossible to provide an instantaneous response to the closed-loop control system. Energy storage bag #t
ri, it was not possible to cope with the rapid change π in active and reactive power required for grid stabilization in the event of a power system fault.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not consider speeding up the response of the superconducting energy storage device, and has problems such as being unable to respond to sudden changes in active and reactive power required in the event of a system failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control method for a superconducting energy storage device that enables high-speed control of the active and reactive power of a superconducting energy storage device in order to solve the above-mentioned problems.

〔problem? Means to solve]

For the above purpose, an adder circuit is provided between the function circuit and the circuit connected to the next stage of the function circuit in the conventional closed-loop antibacterial system, and the output signal of the function circuit and the active/reactive power command from the system control and adjustment device are The signal resulting from the addition of the values is used as an input signal to the circuit at the next stage, so that the signal is continuously acquired.

[Effect]

The output signal of the adder circuit provided between the function circuit and the circuit connected to the next stage of the function circuit in the closed-loop control system. The only difference is the delay in the operating time. Therefore, the superconducting energy storage device quickly responds to changes in active and reactive power command values from the system control and adjustment device without being affected by the time constant of the function circuit.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is an overall configuration diagram of this embodiment, and shows an AC system 1,
A main circuit consisting of a converter transformer 2.3, a thyristor converter 4.5, a superconducting coil 6, and an alternating current detection circuit 7,
DC current detection circuit 8, AC voltage detection circuits 9, 10. Active/reactive power calculation circuit 1], No-load DC tEE calculation circuit 1
2, an active/reactive power calculation circuit 13, and a phase control circuit].

In Fig. 1, each thyristor converter 4 and 50 control angles are αl [degrees] and α2 [degrees], respectively, the no-load maximum DC 1 voltage of one thyristor converter is EO [V], and the superconducting coil 6 If the direct R flowing through the current is IdCA] and T, then the AC system] is super 1! If the active power PCW] flowing into the conductive energy storage device fit, the reactive power Q[Var] and the commutation reactor 7 of the thyristor conversion device are ignored, they are expressed by the following equation.

P=EoId(ωSα, -4-cosα2) ・
...(1) Q = Eo Id(sinα++sinα
2) As can be seen from equations (1) and (2) of (2), active power P and reactive power Q can be adjusted by manipulating each control and sub-delay angle α1°C2.

Therefore, in the control circuit of superconducting energy storage snowmaking,
5! Detects the active power P and reactive power Q from the superconducting energy storage system Vca from the flow system 1, and calculates the active power command value Pr and the reactive power command 1 given from the system control and adjustment device.
Compared with Qr, each control @ delay angle α1.
α2 is 4! i! It has the ability to create

In order to realize the above function, P and Q are obtained from the AC R, current and AC voltage detected via the active/reactive power calculation circuit 11a, the AC current detection circuit 7, and the AC voltage detection circuit 9 in the control circuit shown in FIG. Calculate and output. Also, formula (1),
In order to calculate C1 and C2 from the relationship (2), a page of no-load DC'Narita EO1 DC current Ia is required, and since E and Q are proportional to the effective value of AC voltage, the AC voltage detection circuit lO No-load M current current ball calculation circuit 12 based on the output signal
is released, and a direct current 'IlI flow detection flow path output circuit is obtained at Ia. Active reactive power 1 subcircuit 13ri, P, QtoP
r, Qr cn values are compared, and the suppression delay angles αI and α2 for bringing P and Q closer to pr and Qr are calculated using the values of Eo and Id. m signal C8t, C82? i=output T. here,
The DC current setting 9[1dr is a signal necessary for stable operation of the superconducting energy storage device. (, T-This is a signal generated by the setting circuit. Phase control circuit 14ri, phase control signal CSt.

Generate gate pulse signals g1*gz to control each thyristor converter 4.5 with control delay angles αl and α2 according to the size of C82. :r.

The present invention is applied to the above active/reactive power calculation circuit 13, and FIG. 2 shows a detailed circuit diagram thereof.

The circuit in Figure 2 is an adder circuit 15.16.1? .

18.19,20,21. Current side - function circuit 22, active power side - function circuit 23, reactive power limiting function circuit 24, multiplier circuits 25, 26, divider circuit 27゜28, active/reactive power limiter 29, phase side secondary signal calculation The circuit 30 is implemented in the present invention with adder circuits 18 and 19.

Next, the second FI! The operation of the circuit J will be explained. The difference between the DC current setting value Idr and the DC current detection value Id is output to the adder circuit 17 as at (=Idr - Id), and the CI is multiplied by 1 to the current control function circuit 22 as C1 (=Kt#t).
Output. The adder circuit 15 receives the active power command value Pr from the grid side@device, and the output signal C of the even function circuit 22 on the downstream side.
From I and active power detection value P, signal gp (Pr+C1-
P) is created. Active power snow 11@Function circuit 23, for example, the number of transmission intervals G pcs in the following equation) However, Kp, Tp
s and Tp2 are the gain, lag time constant, and lead time constant, respectively.

At this time, the output becomes Dp 1rx Gp (s)·ip. It also has this circuit frame limiter function, and the magnitude of the signal Dp2 is used as the limiter value, and the value of Dpl is -l.
Dp, l≦Dpl≦IDI)21.

In other words, when DQ2 is a positive value, Gp(s) ・t p
>Dpz, then Dp+=DQ2, and when DQ2 is a negative value, if Gp(S)·gp<Dpz, then Dpt=Dps.

Adder circuit 18F1Pr, creates Pr2 (=Dpt+Pr) using DI)t as an input signal.

The adder circuit 16 receives a reactive power command ([
A difference εa (=Qr−Q) between Qr and the detected reactive power value Q is created. Similar to the circuit 23, the reactive power control function circuit 24 realizes the following transfer function GQ(S).

However, KQ * TQI * Towri'
lia, lag time constant, and lead time constant. At this time, the output DQI becomes GQ(S)·at2. Also, like the circuit 23, this circuit also has a limiter function, and the magnitude of the signal DQ2 is used as the limiter value.
The value of QI is −IDQ21≦DQI≦IDQ! Limited to + range. That is, when DQ2 is a positive value, GQ(
S)・'If Q>DQ2, set DQ1=DQ2, and DQ
When 2 has a negative value, if GQ(S)·'Q<DQ2, then Dqt=DQz. The adder circuit 19 has Q'l
Qr2 (=DQs +Q
Create r l.

You can get more ePr! , Qr= by equations (1), (2) v
α ri and α2 are calculated by using them instead of P and Q at c.

In other words, α type from the following equation. α2 will be found.

P r* = Eo I d ("tlr -) - Q)
Sc12 ) = (5) Qrx = EoId (s
inαt −1−cos ax ) ...(6)
First, from the divider circuit 27.28Vc, convert the above equation to 2EoZ
Compare 9 standard with d. Therefore, the divider circuit 27.2
8 output signals Pr, , Qr, frame each Pr1
=Pr2/2EoId I Qrl=Qr2/2Eo
It becomes Id. At this time, equations (5) and (6)d are converted as follows: A- However, the device's ? #Note: It is necessary to satisfy the condition of P r21 + Q convex S1, and if P? t+Qr”l)
1, the active/reactive power limiter 29 operates and P
' Change I + Qrt f respectively and Pro + Qro
and T. At this time, - becomes. From the above relational expression of the phase control signal calculation circuit 300, α! , α25-calculate\α1. Signals proportional to the magnitude of α2 are output as phase side #J signals C8I and C82, respectively.

Moreover, the multiplier circuits 25 and 26 each have P'O*
Qro vc2Eo If multiplied, pr3. Pr3 and output. Furthermore, pr and Qr are subtracted from each of the adder circuits 20 and 21H1, and the values Dp2 and DQ2 corresponding to DpHDQI are obtained for P'o * Q'o''.
Find f backwards.

In FIG. 2, an open-loop control system for active power consisting of a JJO calculator circuit 15 and an active power control function circuit 23, an adder circuit 16, and a reactive power control system consisting of an active power control function circuit 24 are shown. In the loop control system, Pr, Qr, l! :P,
The divider circuit 2 is connected to an open loop control system in which pr is directly delayed to the 71OX circuit 18 and Qr is directly delayed to the adder circuit 19Vc.
7.28, phase-based sub-signal calculation consisting of active/reactive power limiter 29 and phase control signal calculation circuit! 1! K p
Transmit the changes of r and Qr at high speed.

〔Effect of the invention〕

According to the present invention, since it is possible to transmit the change of valid/invalid force command from the system control device to the phase control signal calculation mechanism, MAit for the command from the system control #J device can be transmitted to the phase control signal calculation mechanism. It is possible to speed up the response of conductive energy storage devices.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment using the method of the present invention,
FIG. 2 is also a block diagram.

Claims (1)

[Claims] 1. A superconducting energy storage device that transfers power between an AC system and a superconducting coil using a semiconductor power converter converts active power or reactive power flowing from the AC system into the semiconductor according to an active power command value or a reactive power command value. In a control method for a superconducting energy storage device that is adjusted by closed-loop control of a power converter, an open-loop element is added to the output side of the function element that performs the closed-loop control, to which changes in the active power command value or reactive power command value are directly transmitted. A control method for a superconducting energy storage device characterized by the following.