FI116922B - Method for disconnecting a thyristor-coupled capacitor battery and a thyristor-coupled capacitor battery - Google Patents

Description

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Method for Disassembling a Thyristor Switched Capacitor Battery and a Thyristor Switched Capacitor Battery

Field of the Invention

The present invention relates to a method for disconnecting a thyristor-switched capacitor battery, said capacitor battery comprising a thyristor switch comprising a single thyristor, a coil coupled to said thyristor switch, and a capacitor coupled to said coil.

The invention further relates to a thyristor coupled capacitor 10 A risto comprising a thyristor switch comprising at least one thyristor connected in series with said thyristor switch and a condens connected in series with said coil.

Background of the Invention

Generally, 15 capacitors are used to compensate the transmission lines, such as static reactive power compensators SVC (Static \ pensator), which generally comprise a few, such as two or three, capacitor batteries with switchable battery capacities of approximately 50-150 Mvar, 1 - 3 kA The prior art thyristor coupled capacitor 20 is disconnected from the mains voltage at its natural zero point: the capacitor V has a peak voltage flf of the mains voltage

v · maximum energy available. The capacitors are thus left with mains voltages

a dc charge equal to a puff. In this case, the thyristor switch should: lava voltage TRV (Transient Recovery Voltage) a total of 25 dc voltage and the peak value of the mains voltage. However, since the voltage duration of a KS thyristor is currently only about 5.2 to 8 kV and typically * * * * can withstand significant overvoltages, the thyristor switch becomes a series of thyristors connected in series due to this phenomenon in the capacitor battery. However, the problem with the prior art solution is that when the thyristor switch comprises a plurality of 2 friction switches. In addition, considering that a large number of thyristors are typically only capacitors when disconnecting the battery, the power loss due to the large number is disproportionately high for the Vern crossover utilization rate.

CA 1208286 discloses a static kit comprising a thyristor switch circuit, which in turn comprises a terminal thyristor arranged to connect the device to a mains voltage, and an auxiliary thyristor configured to connect the voltage limiting device alongside the terminal thyristor when the voltage across the thyristor However, the problem with the solution of 10 is that there is an accumulation of noise in the switch. Power consumption is thus considerable. Many components, some of which come at a price, are needed in a voltage decoupling circuit

Brief Description of the Invention

It is therefore an object of the invention to provide a method of disconnecting a capacitance battery and a thyristor switched capacitance battery by which the above-mentioned disadvantages can be reduced.

The method according to the invention is characterized in that the denaturator battery further comprises a coil connected in parallel with the coil.

I method, wherein the auxiliary power source is charged until its I

20 is the amount of energy stored in the coil, and sam ... a thyristor switch at a predetermined time by directing the thyristor switch to a negative pre-oil for a predetermined backup time by discharging the voltage applied to the auxiliary energy to said coil.

Further, the capacitor for the battery according to the invention is characterized in that the capacitor battery further comprises a coil powered with a coil, the capacitor battery comprising means! ** ·. to charge the energy source, and means for turning off the thyristor switch * * at a specified time by controlling the voltage of the thyristor switch (204) to a predetermined backup time by discharging the voltage charged by the auxiliary energy 30 to the coil.

** l S I ncriistiui «iich aHIS twietnrikvtkpth / IfnnHeneaate 3 this amount of energy corresponds to the amount of energy stored in the coil. The probe is turned off at a predetermined time, preferably at zero capacitance, by controlling the thyristor switch voltage negative for a predetermined safety time, preferably longer than the determined disconnection time of the thyristors 5, by discharging the auxiliary capacitor with one or more thyristors.

According to one embodiment of the invention, the energy contained in the coil is further transmitted, for example, to a capacitor or a resistor

According to another embodiment of the invention, the tyristc 10 capacitor battery is connected to a triangle or a star.

According to a third embodiment of the invention, the capacitor battery employed is one or three phase.

An essential advantage of the arrangement according to the invention is that the number of thyristors 15 comprised in a square-connected capacitor battery is substantially reduced, since no direct voltage is left on the return voltage, so that the return voltage is substantially lower than in the known solution. As a result, the battery thyristors have a much smaller association. This is very advantageous for etc transmission companies as the smallest loss compensators of type 20 are the most profitable. Another advantage is that the cost of manufacturing the battery is reduced by the thyristor required): v. as the number of roads decreases. A further advantage is that the structure of the thyristor coupled capacitor battery of k * * is relatively simple and easy to manufacture, and furthermore, the thyristor coupled capacitor array is typically of good reliability.

BRIEF DESCRIPTION OF THE DRAWING DESCRIPTION OF THE INVENTION The invention will now be described in more detail in the full description of the preferred embodiments, with reference to the accompanying drawings, in which:

Fig. 1a shows a thyristor coupled capacitor pair according to the prior art and Fig. 1b k 30: *:

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1a illustrates the coupling of a thyristor coupled capacitor pair according to the prior art and an embodiment of Fig. 1b to a mains voltage 100. The coupled capacitor battery of the prior art typically disconnects naturally from the reference 100 only at zero 104 in response to silk swelling. In the figure, a disconnection moment of the prior art solution r is denoted by reference numeral 106. Because of the relatively small ice current 10, the current thyristors typically do not withstand significant over-thyristors connected in series.

It is possible to disconnect the thyristor-coupled capacitor battery according to the invention from mains voltage 100, for example four beams previously with a maximum value of 110 of 110. There is no door to the capacitor and thus the instantaneous voltage of the capacitor is zero 112 In the figure, a disconnection moment of the circuit according to a different embodiment of the invention, or with reference numeral 114. If, for example, the mains voltage is the effective value, h kV, is typical of the prior art capacitor battery! 20 20 kV DC, whereby the voltage returning to the thyristor switch is no. In the capacitor battery of the invention, however, no condensation remains on the DC component, so the burning voltage here would be a tap [•• I. only about 20 kV. Thus, in a capacitor battery according to the invention! *, you will notice the prior art solution to the thyristors

m * 25 m, which allows for significantly cheaper switching solutions V

Figure 2 shows a preferred embodiment of the invention; A thyristor coupled capacitor battery according to claim 1, comprising a series of at least one, preferably multiple, e.g. 5 to 20, thyristor switch TV (204) having a thyristor Ti (202), a current suppressor a (.a 30 (206) and a compensation capacitor C (208) blood to U1 - U2, for example, as shown in the figure.

A

5a, such as a voltage or current transformer fla, until the amount of energy stored in the auxiliary conduit CA (210) corresponds to the amount of energy stored in the coil L (206). Preferably, the capacitor battery comprises a diode (212) of Fig. 2r and a current limiting resistor R (214) by means of which the ap 5 CA (210) can be charged. In order to prevent the DC capacitor C (208) from being charged with DC voltage, the thyristor switch TV (204) is energized, for example, by switching off the mains voltage by discharging the capacitor U (CA) to the coil L (206), for example comprising a switching element 10 a semiconductor component such as a thyristor or IGBT (Insulated Gat Transistor). The auxiliary switch TVA (216) is preferably controlled by a secondly connected control electronics for supplying the input disconnection command and the current pulse current output from the capacitor CA (210) to be at least 15 (206) at the time of disconnection. The coil voltage U {is equal to but opposite the thyristor switch voltage. Thus, the thyristor switch TV (204) shuts off when the thyristors are energized for a negative predetermined safety time, which is preferably longer than the predetermined switch-off time of the torque switch (200, 202). According to one embodiment of the invention, the voltage U (C) and the voltage U1 - U2 of the Konder 20 C are zero: The energy demanded can be further transmitted, for example, to auxiliary capacitors (210) or to a resistor which is preferably very small : The power is turned off.

According to one embodiment of the invention, the circuit is t nal, whereby both the diode D (212) and the thyristor TVA (216) are connected as shown in Fig. 2.

. · *. Figures 3a, 3b and 3c show, for example, in Figure 2 the magnitude of a solution according to a preferred embodiment of the invention. 30 sesti. Fig. 3a shows the voltage: ··· “(300) of the auxiliary capacitor CA (210) as a function of time t. The auxiliary capacitor CA (210) is charged; 6 then the fireplace n equal to the voltage U (TV) of the thyristor switch TV (204). Hereby, the thyristor switch TV (204) originally replaced by the TV (304) is preferably completely replaced by the auxiliary capacitor CA (210) as shown in Fig. 3c. The thyristor switch TV (204) 3c shows which security time is preferably longer than the field time U of the thyristor (200, 2C, as shown in Figure 3b).

According to a preferred embodiment of the invention, the thyristors capacitor battery is connected to a triangle or a star.

According to a preferred embodiment of the invention, the thyristor capacitor battery is one or three phase.

It is obvious to a person skilled in the art that the basic idea of technological development can be implemented in many different ways. The invention and its forms are thus not limited to the examples and components described above, but may vary within the scope of the appended claims.

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Claims (13)

A method for inputting a thyristor coupled capacitor battery, said capacitor battery comprising at least one (200, 202) thyristor switch (204), a coil (206) coupled to said thyristor switch (204) and a capacitor (208) connected in series to said coil (208). 206), characterized in that said capacitor battery further comprises: auxiliary energy 10 (210) coupled in parallel with said coil (206), the method comprising: charging said auxiliary energy source (210) until its I energy corresponds to the energy stored in the coil (206). said thyristor switch (204) by predetermined control of the voltage of the thyristor switch (204) to a negative predetermined safety time by discharging said auxiliary power source (210) into said coil (206). A method according to claim 1, characterized in that said thyristor switch (204) is turned off at the zero point of the voltage of the capacitor. A method according to claim 1 or 2, characterized by: ♦ turning off said thyristor switch (204) at a mains voltage: 25. A method according to any one of the preceding claims, characterized in that said auxiliary energy source (210) is at least one of the following capacitors 30. A method according to any one of the preceding claims Method according to one of the preceding claims, characterized in that said auxiliary energy source (210) is charged with one of the following components: 5. a coil (206) - a capacitor (208) - an auxiliary transformer A method according to any one of the preceding claims, characterized in that a charge element (!) Comprising said capacitor battery (208) is discharged into said auxiliary power source (210). A method according to claim 7, characterized in that said coupling element (216) comprises at least one pu 15 component. A method according to any one of the preceding claims, characterized in that said safety time is longer than said tripping time of said thyristor (5). A thyristor coupled capacitor battery comprising an air den thyristor (200,202) comprising a thyristor switch (204), a coil (206) Γ ': connected in series with said thyristor switch (204) and a capacitor (208) coupled to said coil (206). characterized in that said capacitor battery further comprises: auxiliary energy ..T (210) coupled in parallel with said coil (206), said capacitor battery comprising: means for charging said auxiliary power source (210), and: Means for switching off said thyristor switch (204). ···. At a specified time by controlling the voltage of the thyristor switch (204) nege • · * output to said / terminals said capacitor battery comprises means for switching off said switch (204). the voltage of capacitor (208) to zero A capacitor according to claim 10 or 11, characterized in that said capacitor battery 5 comprises means for extinguishing said plunger (204) at a mains voltage zero. A capacitor grid according to any one of claims 10 to 12, characterized in that said auxiliary power source (210) is at least one of the following - a capacitor battery A capacitor grid according to any one of claims 10 to 13, characterized in that said coil (206) is arranged to discharge at least one of the following components: - to said capacitor (208) - a resistor A condenser according to any one of claims 10 to 14; Risto,: v: known for • «; * 19; one of the following components arranged to charge an auxiliary power source (210):. / 25 - coil (206)! # Γ - capacitor (208) - auxiliary transformer ♦ * + \: 16. A capacitor according to any one of claims 10 to 15; Risto,. 30 known for. * ··. the capacitor battery (208) comprising a switching element (216) · • M \ \. The condenser junction according to any one of claims 10 to 17, characterized in that said safety time is longer than the predetermined tripping time of said thyristor (S5.). • * 9 9 9 • · 9 «4 · 9 9 999 9 9999 999 9 9 9 m 999 9 9 9 9. m 999 • 99 9 9 9 9999