JPH08340638A - Compensation controller of power system - Google Patents

Abstract

PURPOSE: To control the secondary excitation winding by the feedback of the electric parameter of a power system, and improve the resistance to overcurrent by installing a wire wound AC machine equipped with a primary winding and a secondary excitation winding to insert its generation voltage in series, in the line of the power system. CONSTITUTION: The output x of the electric parameter detection means 10 of a transmission circuit 5 gives a command value y to an excitation means 600 through a command value generation means 11, and excites a secondary excitation winding 50b, and adds or reduces the intensity of the excitation. Accompanying this, the voltage generated in the primary winding 50a of the wire wound AC machine 50, that is, the insertion voltage Vi changes, which adjusts and controls the electric parameter such as the current, voltage, power, etc., of the transmission line 5. As a result, in case that grounding accident occurs in the transmission line 5, the accident current flows to the primary winding 50a, and an overcurrent flows to the secondary winding 50b, too, but since the voltage of the secondary winding or the excitation means is low, it does not become so large in VA capacity. Therefore, the resistance to overcurrent can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system compensation controller for compensating a reactance voltage of a power system.

[0002]

2. Description of the Related Art FIG. 8 shows, for example, "Measurement and Control Vol.
It is a figure which shows the example of the compensation system of the conventional alternating current electric power system introduced also into the 9th (September, 1993 issue) PP742-749. In the figure, 1 is a power source on the power transmission side, 2 is a static power converter, 3 is a power receiving side system, 4 is an auxiliary power transformer, 5 is a power transmission line, 6 is the reactance of the power system including the reactance of the power transmission line 5, 32 is a high voltage primary winding 311
And iL is the line current of the transmission line 5.

In FIG. 8, the static power converter 2 is composed of two voltage type self-excited inverters / converters linked via a direct current, and applies an appropriate voltage to the power transmission line 5 in series. The current and power flowing between the power transmitting and receiving terminals are adjusted by changing the phase of this applied voltage.

[0004]

Since the conventional AC power system compensation system is constructed as described above, ground faults often occur in the lines of the power system as shown by arrows, and the line is inserted in series in the power transmission line. The ground fault current also flows through the static power conversion device 2 that has been operated. This ground fault current is several times the rated current to 10
Reaches more than twice. For this reason, the semiconductor element in the static power converter having a small overcurrent withstanding capability is threatened. In other words,
There is a problem in that the static electric power converter has a shortage of overcurrent capability and it is difficult to coordinate protection. In addition, there is a problem to be solved in the device itself of the present invention for improving the overcurrent withstand capability. In particular, there are challenges in improving control characteristics and compensating performance.

The present invention has been made in order to solve the above problems, and it is possible to improve the overcurrent withstanding capability of the series compensator and to improve the reliability of the power system. The purpose is to obtain the device. Another object of the present invention is to obtain a compensation control device for a power system, which can improve control characteristics or compensation performance.

[0006]

According to a first aspect of the present invention, there is provided a compensation control device for a power system, which includes a primary winding and a secondary excitation winding in which a generated voltage is inserted in series in a line of the power system. A winding type AC machine, means for detecting an electric variable of the power system, and exciting means for receiving the output of the detecting means and exciting the secondary exciting winding.

A compensation control apparatus for a power system according to a second aspect of the present invention is a winding type AC machine having a primary winding and a secondary excitation winding in which a generated voltage is inserted in series in a line of the power system. Receiving the output of the command value generation means for generating the voltage command value that the primary winding should generate in response to the detection means of the electric variable of the power system, the output of the detection means, and the output of the command value generation means And an excitation means for exciting the secondary excitation winding.

According to a third aspect of the invention, there is provided a power system compensation control device according to the first or second aspect of the invention, wherein the electric variable detecting means includes a current detecting means for detecting a line current of the power system. It is a thing.

According to a fourth aspect of the present invention, there is provided a power system compensation control device according to the first and second aspects of the invention, wherein the electric variable detecting means detects electric power transmitted through a line of the electric power system. The power detection means is provided.

According to a fifth aspect of the present invention, in the power system compensation control device according to the second aspect of the invention, the command value generating means is a "voltage vector command including at least two axial vector components to be generated by the primary winding.""Value" is output and an exciting means for exciting the secondary excitation winding based on the voltage vector command value is provided.

According to a sixth aspect of the present invention, there is provided a power system compensation control apparatus according to the fifth aspect of the invention, wherein the exciting means is "a voltage vector command value to be generated by the primary winding and a current of the primary winding or A secondary excitation current command means for determining the secondary excitation current by inputting the proportional amount and ", and a secondary excitation current control means subordinate to the secondary excitation current command means.

According to a seventh aspect of the present invention, there is provided a power system compensation control device according to the second aspect to the sixth aspect, wherein the command value generating means is "a voltage command to be generated by the primary winding. A command value "including in-phase / opposite-phase components with respect to current is generated, and a speed detection means and a speed control means of the wire wound type AC machine are provided. The phase component is adjusted.

According to an eighth aspect of the present invention, there is provided a power system compensation control apparatus according to any one of the first to seventh aspects, further comprising an exciting AC machine coupled to a rotor of the wire-wound AC machine. Excitation power is transmitted and received between and the above-mentioned excitation means.

[0014]

According to a first aspect of the present invention, there is provided a winding type AC machine having a primary winding and a secondary excitation winding, the generated voltage of which is inserted in series in a line of the power system.
The electric variable of the electric power system is provided with detecting means and exciting means for exciting the secondary excitation winding by receiving the output of the detecting means, whereby the electric variable is feedback-controlled by the excitation control, and the electric variable is Can be tailored to control objectives and goals. Moreover, since the winding type AC machine is inserted in series, the overcurrent withstand capability is large. On the other hand, when the ground fault fault current flows through the primary winding, it also flows through the secondary winding. However, the exciting power supply only requires a low voltage, low frequency, small capacity, and the current capacity is easily increased.

According to a second aspect of the present invention, there is provided a power system compensation control device comprising: a winding type AC machine having a primary winding and a secondary excitation winding, the generated voltage of which is inserted in series in a line of the power system; The electric variable detecting means for the electric power system, the command value generating means for receiving the output of the detecting means to generate a voltage command value to be generated by the primary winding, and the output for receiving the command value generating means By providing an exciting means for exciting the secondary excitation winding, a desired voltage command required for the power system is given in a fast-forwarding manner, and the secondary excitation winding is controlled depending on this.

According to a third aspect of the invention, there is provided a power system compensation control device according to the first or second aspect of the invention, wherein the electric variable detecting means includes a current detecting means for detecting a line current of the power system. As a result, the secondary excitation winding is controlled so that the desired line current required for the power system is obtained.

According to a fourth aspect of the present invention, there is provided the power system compensation control device according to the first or second aspect of the invention, wherein the electric variable detecting means detects the electric power transmitted through the line of the electric power system. By providing the power detection means,
The secondary excitation winding is controlled so that the desired transmission power required for the power system is obtained.

According to a fifth aspect of the present invention, in the power system compensation control device according to the second aspect of the invention, the command value generating means is a "voltage vector command value including at least two axial vector components to be generated by the primary winding." Is provided and the excitation means for exciting the secondary excitation winding based on the voltage vector command value is provided, the two axis components of the insertion voltage are distinguished and vector controlled, and the real axis imaginary of the line current and the power is calculated. The basis for vector control of two axis components is created.

According to a sixth aspect of the present invention, there is provided the power system compensation control device according to the fifth aspect of the invention, wherein the excitation means is "a voltage vector command value to be generated by the primary winding and a current of the primary winding or the current thereof. By providing a secondary exciting current command means for determining the secondary exciting current by inputting a proportional amount and ", and a secondary exciting current control means subordinate to the secondary exciting current commanding means, the secondary response can be performed in a speed-responsive feedforward manner. The exciting current is controlled.

According to a seventh aspect of the present invention, there is provided the power system compensation control device according to the second to sixth aspects of the invention, wherein the command value generating means sets "the voltage command to be generated by the primary winding to the line command". A command value "including in-phase / opposite-phase components with respect to current is generated, and a speed detection means and a speed control means of the wire wound type AC machine are provided. By adjusting the phase components, the speed is controlled by the power present in the wirewound AC machine.

According to an eighth aspect of the present invention, there is provided a power system compensation control device according to any one of the first to seventh aspects, which comprises an exciting AC machine coupled to a rotor of the wire-wound AC machine. By exchanging excitation power with the excitation means, stable excitation power can be exchanged between the excitation means and the excitation AC machine even in the event of a power system failure.

[0022]

【Example】

Example 1. FIG. 1 shows an embodiment of the present invention. In FIG. 1, 10 is an electric variable detecting means for detecting electric variables such as current, voltage and electric power of a transmission line, 11 is a command value generating means and 12 is a winding type AC. Compensation voltage applying means composed of the machine 50 and its exciting means 600, 70 is an auxiliary power transformer, and iL is a line current. The same reference numerals indicate the same means or equivalent means.

In the embodiment shown in the figure, the output x of the electric variable detecting means 10 of the power transmission line 5 is given to the command value generating means 11, and the command value generating means 11 receives the detected output x and the compensating voltage applying means 12 receives the detected output x. A command value y is given to the excitation means 600. The excitation means 600 receives the command value y and receives the secondary excitation winding 5
0b is excited and the intensity of the excitation is adjusted. Along with this, the voltage generated in the primary winding, that is, the insertion voltage Vi changes, and the electric variable x such as the current, voltage, and electric power of the transmission line 5 is adjusted. That is, the electric variable x detected by the electric variable detecting means 10 and fed back is controlled. At this time, depending on what is selected as the electrical variable x to be detected, it is possible to control the electrical variable according to the target objective.

For example, when the voltage is controlled, the voltage is detected and fed back, when the current is controlled, the current is detected and fed back, and when the power is controlled, the power is detected and fed back. Further, even when controlling the power, when controlling the active power or the reactive power, it is possible to detect the active current or the reactive current and feed them back. Further, in the case of stabilizing control of power fluctuation or phase fluctuation, stabilization control can be performed by feedback of active power or active current or control using these as parameters. Furthermore, in the voltage control, it is possible to cope with the control using reactive current or reactive power as a parameter. Thus, the electrical variable to be detected can be selected from various variables according to the purpose of use, and
It can be controlled by various dependent relationships.

When a ground fault occurs in the power transmission line in the embodiment of the present invention, a fault current flows through the primary winding 50a, but this overcurrent withstand capability is much higher than that of semiconductors. Next, an overcurrent also flows through the secondary winding 50b due to the transaction, but the voltage of the secondary winding and the excitation means is low, and therefore the VA capacity does not increase so much. That is, even if the current capacity of the static power converter (cycloconverter, inverter / converter, etc.) as the exciting means is increased, the voltage is low, so that the VA capacity is considerably reduced. Also, when the fault current bypass short-circuit switch means (thyristor switch or the like) is connected to the secondary winding 50b to take countermeasures, the VA capacity is considerably small because of the low voltage circuit. For the above reasons, the present invention has a feature that the overcurrent withstand capability can be improved. Along with this, the overall reliability is improved.

Example 2. FIG. 2 is a diagram showing another embodiment of the present invention. In FIG. 2, 7 is a power detecting means or power calculating means, 8 is a current detecting means for detecting a line current, and 9 is a current detecting means.
Is a voltage detecting means for detecting the line voltage, 100 is a flywheel coupled to the rotating shaft of the winding AC machine 50, and 32 is an insulating transformer having a primary winding 311 and a secondary winding 312.

In the figure, as described above, the electrical variable x may be any one of current, voltage, and power, or a combination thereof, depending on the target purpose. The flywheel 100 stores the amount of active power, that is, energy together with the rotor inertia of the alternator, and enables intervention (injection / absorption) of active power to the compensation voltage applying means 12. Further, the insulation transformer 32 suppresses the insulation class of the AC machine to a low level when it is applied to the high-voltage transmission line 5, and enhances overall economic efficiency and overall reliability.

Example 3. FIG. 3 is a view showing still another embodiment of the present invention, in which 80 is an exciting AC machine (shaft exciter, generator / motor) coupled to the rotary shaft of the winding AC machine 50, Reference numeral 81 is the armature, 82 is the field winding, and 83 is field control means having a voltage adjusting function.

In the figure, the exciting AC machine 80 is provided with a damper and can operate in a power generation mode or an electric mode, and the exciting means 600 is preferably a reversible power converter capable of exchanging electric power. That is, the exciting AC machine 80 can transfer the input / output power of the secondary exciting winding 50b and the exciting means 600 that change to positive or negative. As a result, excitation control can be performed regardless of whether the rotor speed is above or below the synchronous speed. That is,
The exciting current can be controlled regardless of the slip voltage induced in the secondary exciting winding, and the change in the direction of the flow of electric power generated at this time can be dealt with.

Further, even when the exciting means 600 requires reactive power, the exciting AC machine supplies the reactive power, so that there is no need to supply it from the power system. Further, even if there is a line voltage drop, phase loss, power failure, or the like due to an accident in the power system, the voltage of the excitation auxiliary power supply, that is, the armature 81 is maintained stable while the rotation is maintained. There is a feature called.

Example 4. FIG. 4 is a diagram showing a detailed partial embodiment relating to the electric variable detecting means 10 and the command value generating means 11. In the electric variable detection means 10 of FIG.
Numerals 3 and 14 are three-phase / two-phase conversion means or the same calculation means for calculating the following equation. The three-phase / two-phase conversion means 14 relating to the current can also perform the same calculation only by changing the voltage to the current, and can perform conversion using the same conversion matrix.

[0032]

[Equation 1]

Further, 15 is a power detection means or power calculation means for receiving or outputting the current detection means 8 and the voltage detection means 9 to detect or calculate the transmitted power. These detection outputs are given to the command value generating means 11.

Next, of the command value generating means 11, a method of deriving a reference vector required for control and calculation will be described first. In the command value generating means 11, reference numerals 16 and 17 denote integrating means or integral calculating means, which rotate the phase in the direction delayed by 90 ° (the axes are interchanged and one polarity becomes negative), and the flux linkage number λα of the α-β axis. , Λβ are output. At this time, the sign is changed with respect to the β-axis integrating means 17 whose polarity changes, and the β-axis flux linkage number λβ is obtained. 18 is a vector absolute value calculation means,
19 and 20 are unit vectors [eα, which are reference vectors.
eβ] ^T = [sin θe, cos θe] ^T is a dividing means, and 21 is a means (inverse trigonometric function calculating means) for calculating the rotation angle θe of the reference vector from the unit vector [eα, eβ] ^T.

The above 16 to 21 are the coordinate reference calculating means for determining the reference coordinates (unit vector e or the rotation angle θe of the reference vector) for observation and control. In the above-mentioned embodiment, since the magnetic flux linkage numbers λα and λβ obtained by integrating the voltage are used as a reference, there is a feature that the influence of the instantaneous voltage fluctuation is less likely to occur and the malfunction due to the surge is less likely to occur.

As another embodiment, the flux linkage numbers λα, λβ
Instead, the voltage vectors Vα, Vβ and the current vector iα,
iβ can be chosen as the reference vector. In this case, the voltage or current obtained from the output of the voltage detecting means 9 or the current detecting means 8 is converted into the 3-phase / 2-phase converting means 13 or 14.
3 phase / 2 phase conversion with the output Vα, Vβ or iα,
iβ may be input to the absolute value calculating means 18 and the dividing means 19 and 20.

These have a feature that the derivation of the reference vector is easy. In addition, the current vector has a feature that it is easy to survive a ground fault and is not easily affected by a voltage surge. Furthermore, by combining these with a PLL (Phase Locked Loop), the rotation angle θe of the reference vector
Or the unit vector [eα, eβ] ^T = [sin
θe, cos θe] ^T can be calculated.

Next, the part for calculating the command value Vi ^* of the insertion voltage vector to be applied by the compensation voltage applying means 12 in order to control the transmitted power will be described. In the figure, 22 and 23 are power control means, 22 is a power comparison section thereof, and 23 is a power control calculation section. Further, reference numeral 24 is a coordinate conversion means for converting the current vectors iα, iβ into the quantities id, iq of the synchronous rotation coordinates by the unit vectors eα, eβ, and performs the calculation of the following equation.

[0039]

[Equation 2]

That is, it is a vector rotator which reverses the current vectors iα, iβ rotating at an electrical angle θe by θe according to the above equation and converts them into a stationary vector. Furthermore, 2
Reference numerals 5 and 26 are multiplication means, 27 is orthogonal transformation means (orthogonal switching means), and 28 is vector rotation means.

Next, the operation will be described. First, the power comparison unit 22 compares the power command P ^* with the transmitted power P, the deviation is given to the power control calculation unit 23, and the proportional coefficient (insertion reactance) Xi is output. At this time, the power control calculation unit 23 may perform control calculation such as proportional calculation P, proportional integral calculation PI, and proportional integral differential calculation PID. Then, the multiplication means 25, 26 add the proportional coefficient Xi to each axis current id, iq.
To output voltage vectors Vid ^* and Viq ^* to be inserted. At this time, the phase of the reactance voltage to be inserted must be advanced by 90 ° (π / 2) with respect to the current. That is, it is necessary to perform the orthogonal transformation, and 27 is this means, and the outputs of the multiplying means 25 and 26 are given to the other axes, and the sign given from the imaginary axis (q axis) to the real axis (d axis) is inverted.
These calculations may be performed on the stator coordinates (α-β axis or RST axis).

By performing these transmission power control, the transmission power can be adjusted by the feedback control action.
In addition, the power command P ^* can be operated to stabilize the power system, prevent power fluctuations, and prevent phase fluctuations. The insertion reactance Xi can also be used when the line current is controlled by the variable reactance control. Further, the variational rotation angle command Δθ ^* from the compensation voltage applying means 12
A vector rotating means 28 for applying rotation is provided, and this output Vi ^* serves as a voltage vector command to the compensation voltage applying means 12. Here, the variation rotation angle command Δθ has a function of adjusting the electric power interposed in the compensation voltage applying means 12 and has a function of controlling an amount (speed of the wire-wound AC machine) corresponding to the integrated value. The vector rotation can be obtained by multiplying the input vector by the matrix of the following equation from the left.

[0043]

(Equation 3)

In this embodiment, the simple multiplication of the coefficient Xi is sufficient, and the compensation voltage applying means 1 for applying the orthogonal voltage is used.
Since the average value and integrated value of the electric power intervening in 2 can be made almost zero, there is an economical advantage.

Example 5. FIG. 5 is a diagram showing another detailed partial embodiment of the electric variable detection means 10 and the command value generation means 11. In the figure, 51 and 53 are d-axis (real axis) current control means, 51 is a current comparison section thereof, 53 is a current control calculation section thereof, 52 and 54 are q-axis (imaginary axis) current control section, Is a current comparison unit, and 54 is a current control calculation unit. Further, 55 and 58 are coefficient multiplying means (coefficient multipliers) for determining the voltage command value to be given to the same axis, and 56 and 57.
Is a coefficient multiplying means (coefficient multiplier) for determining the voltage command value to be applied to the other axis (orthogonal axis), and 59 and 60 are command value synthesizing means (adding / subtracting means).

The current / voltage / power / reference vector detection / calculation unit is the same as in FIG. next,
The operation of the voltage command value generator when the line current is controlled by the inner control loop will be described. The electric power comparison unit 22 compares the transmitted electric power P with the electric power command P ^*, and the deviation is given to the electric power control calculation unit 23 to output the actual axis current command value id ^* . At this time, the power control calculation unit 23 may perform control calculation such as proportional calculation P, proportional integral calculation PI, and proportional integral differential calculation PID. Further, the actual axis current id is compared with the actual axis current command value id ^* by the current comparing section 51, and this current deviation is given to the current control calculating section 53 to output the current deviation response amount ied. At this time, the current control calculator 53 may perform control calculations such as proportional calculation P and proportional integral calculation PI.

On the other hand, q-axis current control side (imaginary axis current control side)
Is used to control the power that is present in the compensating voltage applying means, which will be described later, or the speed that is the amount of its integrated response.
The axis current command value iq ^* is given from the compensation voltage applying means 12. The operation and characterization of the q-axis current control means 52, 54 may be the same as in the case of the d-axis.

By thus controlling the line current, the line current fluctuation suppression action by the feedback control action works. Here, an example of fine control for controlling the biaxial component of the line current, that is, the current vector is shown, but the actual axis current control system (line active current control section) is mainly used. Also,
Absolute current value control is also possible.

Next, the detailed operation of the portion for determining the insertion voltage command value Vi ^* from the biaxial line current control means will be described. Coefficient multiplication means 55 to 58 and synthesis means 5 are applied to the outputs from the control calculation means 53 and 54 for each axis.
9 and 60 perform the matrix calculation of the following equation.

[0050]

[Equation 4]

Here, k2 is a coefficient for giving a quadrature reactance voltage for flowing the self-axis current, and k3 is a coefficient for adding a resistance drop voltage and damping for giving the self-axis current. In this manner, not only the reactance voltage to the orthogonal other axis but also the voltage component of the same axis (self axis) is applied to improve the control characteristic of the line current.
Further, the actual axis current command id ^* is replaced with the active current command i _P ^* ,
The imaginary axis current command iq ^* can be used in place of the reactive current command i _Q ^*. Furthermore, the imaginary axis current command iq ^* is set to zero,
Since the variation influences the electric power that intervenes in the compensation voltage applying means 12, the variation imaginary axis current command Δiq ^* from the compensation voltage applying means 12 is received, and thereby the compensation voltage applying means 12 is received.
It is possible to control the electric power intervening in and the integrated response amount (speed). The voltage command value vector Vi obtained as described above
^* Is given as the insertion voltage command to the compensation voltage applying means 12.

Further, instead of the command inputs id ^* and 1q ^* of the command value generating means 11, the line current command (absolute value) i
L ^* , active current command i _P ^* , reactive current command i _Q ^* , active power command P ^* , reactive current command Q ^*, etc. are given, and by giving these commands from a host control means (not shown), the system current Control, active current or reactive current control, active power or reactive power control, and eventually power flow control, system stabilization control (voltage, current, power stabilization, out-of-step suppression, control theoretical dynamic stability Etc.) and phase differential swing of the system
It has features that can suppress power fluctuations and further improve transient characteristics and dynamic characteristics.

Example 6. FIG. 6 is a diagram showing a detailed embodiment of the compensation voltage applying means 12 according to the present invention using a winding type AC machine. In the figure, 151R, 151S and 151T are primary winding current detecting means which can also serve as line current detection. , 16
9 is a power supply for secondary excitation (AC / AC power converter, AC-D
C-AC converter / inverter or cycloconverter), 160a, 160b, 160c are current detecting means capable of detecting both direct current and alternating current, 152, 161
Is a three-phase / two-phase conversion means (can be converted by using the same conversion matrix as in the case of voltage also in the case of current), 162 and 167 are vector rotation means, 163 and 164 are comparison parts of secondary excitation current control means, and 165. , 166 are current control calculation units of the secondary excitation current control means, and 168 is a 2-phase / 3-phase conversion means.

Further, 155 is a detecting means for the mechanical rotation angle θm, and 156 is means for multiplying the output of the rotation angle θm by the number of pole pairs np to convert it into a rotating electrical angle θr. further,
157 is a speed detecting means for detecting (calculating) the rotation speed ωr from the rotating electrical angle θr, 158 is a speed control means, 159.
Is a slip angle detecting means for detecting the slip angle θs by subtracting the rotating electrical angle θr from the electrical angle θe, and 153 is a coordinate converting means for converting the amount of the αβ axis into the amount of the dq axes of the synchronous rotation coordinate, 154
Is a command value calculation means of the secondary excitation current for generating the secondary excitation current commands i2d ^* , i2q ^* from the insertion voltage command Vi ^* and the primary currents i1d, i1q.

Next, the operation will be described. In the figure, the output of the speed control means is fed back to the command value generation means 11 and fed back as an insertion voltage command Vi ^* . At this time, the command value generating means 11 controls the electric power intervening in the compensation voltage applying means 12, that is, the amounts (iq ^* , Δθ ^* ) related to the effective power and torque of the wire-wound AC machine 50, and the line current and The in-phase voltage component is included in the insertion voltage command Vi ^* , and its control is performed. As a result, the winding type AC machine 50
The torque and eventually the speed are adjusted to complete the speed control system. With these, the compensation voltage applying means 1
2, that is, the electric power and torque existing in the wire-wound AC machine 50 can be adjusted to control the speed of the wire-wound AC machine 50. If the command ωr ^* of this speed control system is commanded within the upper and lower limits, the rotational energy can be converted into active power and taken in and out within the upper and lower limits of speed.

On the other hand, the vector rotation means 162 causes the secondary excitation current vector i2 of the slip frequency by the slip angle θs.
Is reversely rotated (in Equation 3, the conversion matrix of Δθ ^* = − θs is multiplied from the input current vector from the left) to convert into the amount of synchronous rotation coordinates. As a result, the secondary excitation current vectors i2d and i2q in the synchronous rotation coordinates are obtained, and the command values i2d ^* and i2 are obtained.
Compared with q ^* . The command values i2d ^* and i2q ^* are obtained by the calculation of the following equation by the command value calculation means 154 for the secondary excitation current.

[0057]

(Equation 5)

Here, ωe is the angular frequency of the system, M is the primary secondary mutual inductance of the winding type AC machine, L1 is the primary inductance of the winding type AC machine, and Lt is the leakage inductance of the transformer 32. In the above equation, the first term on the right side means the exciting current for the primary voltage generation, and the second term means the exciting current for canceling the demagnetizing magnetic flux due to the primary current. Therefore,
The secondary current command vector [i2d ^* , i2q ^* ] ^T can be determined from the primary current vector [i1d, i1q] ^T and the insertion voltage command vector [Vid ^* , Viq ^* ] ^T. Prior to this, the primary winding current i1 (R, S, T) of the winding type AC machine 50 proportional to the line current is converted into a three-phase / two-phase conversion means 15.
After the three-phase / two-phase conversion by 2, the coordinate conversion means 15 is further added.
3, the fixed coordinate quantities i1α and i1β are changed to the synchronous rotation coordinate quantity i.
Convert to 1d and i1q.

Further, in the figure, after comparison by the comparison units 163 and 164 of the secondary excitation current control means, calculation is performed by the current control calculation units 165 and 166 of the secondary excitation current control means to obtain the secondary voltage command V2d. ^* , V2q ^* are output. This output is rotated by the sliding angle θs by the vector rotating means 167 and converted into rotor coordinate amounts V2α ^* and V2β ^* . Further, a three-phase voltage command V2 ^* = [V which should be given to the secondary excitation power source 169 by converting this output into two-phase / three-phase
_2u ^*, V _2V ^*, it is possible to obtain the V _2W ^{*] T.} As a result of desired secondary excitation being obtained by these secondary excitation current control systems, the desired insertion voltage, that is, the primary winding voltage is obtained.

Example 7. FIG. 7 is a diagram showing another embodiment of a compensation voltage applying means using a winding type AC machine, in which a primary voltage control system is provided as a method of determining a secondary current command.
In the figure, reference numeral 71 is a compensation voltage, that is, primary voltage detection means proportional to the insertion voltage, 72 is a collective coordinate conversion means, and 73.
Is a voltage control means.

The collective coordinate conversion means 72 may be executed separately for the two-phase / three-phase conversion means 152 and the coordinate conversion means 153, but it is also possible to collectively execute the following equations. In this respect, the same applies to the above-described embodiment, and the inverse conversion can be collectively performed in the same manner. The same applies to the current.

[0062]

(Equation 6)

In the inverse transformation, the transformation matrix part is expressed by transposing the transformation matrix of the above equation. The voltage control means 73 may have the same configuration as the current control means 163 to 166, and the output of the voltage control means 73 may be the secondary current command vector [i2d].
^* ', I2q ^* '] ^T. However, d
Since the axial voltage is obtained by the q-axis exciting current and the q-axis voltage is obtained by the d-axis exciting current, the sign of the output of the d-axis voltage control means is changed to the q-axis exciting current command, and the output of the q-axis voltage control means. Is the d-axis exciting current command.

As a result, it is possible to provide the secondary current control system that can also have the function of preventing the overcurrent of the secondary winding and the current limiting function in the minor loop, and the control system of the insertion voltage outside the minor loop. Further, the command value generating means 11 shown in FIGS.
In addition, the power flow and line current can be controlled with a major loop. As described above, in this embodiment, since the compensation voltage, that is, the insertion voltage is feedback-controlled, the control accuracy is high. Other functions and features are shown in FIG.
Is the same as

[0065]

As described above, according to the first aspect of the invention, the winding type AC machine having the primary winding and the secondary excitation winding in which the generated voltage is inserted in series in the line of the power system. Since the secondary excitation winding is controlled by the feedback of the electric variable of the power system, there is an effect that the electric variable can be matched with the control purpose and the target. Further, since the winding type AC machine is inserted in series, the overcurrent withstand capability is improved.
On the other hand, when a ground fault fault current flows through the primary winding, an overcurrent also flows through the secondary winding, but the exciting power supply can be of low voltage, low frequency and small capacity, so that the current capacity can be increased. As a result, the overall reliability is improved.

According to the second aspect of the present invention, the command value generating means for receiving the output of the electric variable detecting means and generating the voltage command value to be generated by the primary winding, and the output of the command value generating means. In response to the above, the excitation means for exciting the secondary excitation winding is provided, so that the desired voltage command necessary for the power system is given in a fast-response feedforward manner and the secondary voltage is subordinated to this. The excitation winding is controlled, and the response is improved.

According to the invention of claim 3, in the inventions of claims 1 and 2, the means for detecting the electric variable comprises a current detecting means for detecting the line current of the electric power system. The secondary excitation winding is controlled so that the desired line current required for the electric power system is obtained, and there is an effect suitable for line current control and power flow control using the line current as a parameter. Further, there is an effect that the current limiting control works on the overcurrent.

According to a fourth aspect of the present invention, in the first and second aspects of the present invention, the electric variable detecting means includes electric power detecting means for detecting electric power transmitted through the line of the electric power system. With this configuration, the secondary excitation winding is controlled so that the desired transmission power required for the power system is obtained, and there is an effect suitable for direct power control.

According to the invention of claim 5, in the invention of claim 2, the command value generating means outputs "a voltage vector command value including at least two axial vector components to be generated by the primary winding", Since it is configured to control the excitation of the secondary excitation winding based on the voltage vector command value,
The two-axis components of the insertion voltage are distinguished and vector-controlled in a feed-forward manner, and there is an effect that vector control of the real-axis and imaginary-axis two-components of the line current and power can be performed.

According to the invention of claim 6, in the invention of claim 5, the exciting means inputs "the voltage vector command value to be generated by the primary winding and the current of the primary winding or its proportional amount". As the secondary excitation current command means for determining the secondary excitation current, and the secondary excitation current control means subordinate to the secondary excitation current command means, the secondary excitation current is controlled in a fast-response feedforward manner. There is an effect that can be done.

According to the invention of claim 7, in the inventions of claims 2 to 6, the command value generating means is "in-phase with the current of the line in the voltage command to be generated by the primary winding.・ Producing a command value "including a negative-phase component" and providing the speed detection means and the speed control means of the above-mentioned winding type AC machine, and adjusting the in-phase / negative-phase components in response to the output of the speed control means. Since it is configured as described above, there is an effect that the speed can be controlled by the electric power intervening in the winding type AC machine.

According to the eighth aspect of the present invention, an exciting AC machine coupled to the rotor of the AC machine is provided, and exciting power is exchanged between the exciting AC machine and the exciting means. Therefore, even in the event of a power system failure, there is an effect that stable excitation power can be exchanged between the excitation means and the excitation AC machine. The inventions of claims 2 to 7 have the effect of improving the control characteristics, and the invention of claim 8 has the effect of improving the reliability of the excitation control system.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing a partial embodiment relating to a detection control unit of the present invention.

FIG. 5 is a diagram showing another partial embodiment relating to the detection control unit of the present invention.

FIG. 6 is a diagram showing a partial embodiment relating to a main circuit and a compensation voltage applying section of the present invention.

FIG. 7 is a diagram showing another partial embodiment of the main circuit and the compensation voltage applying means section of the present invention.

FIG. 8 is a diagram showing a conventional example.

[Explanation of symbols]

10 electric variable detecting means, 11 command value generating means, 12
Compensation voltage application means, 50-winding AC machine, 600 excitation means.

Claims (8)

[Claims] 1. A winding type AC machine having a primary winding and a secondary excitation winding, the generated voltage of which is inserted in series in a line of a power system, a means for detecting an electric variable of the power system, and A compensation control device for a power system, comprising: excitation means for receiving the output of the detection means and exciting the secondary excitation winding. 2. A winding type AC machine having a primary winding and a secondary excitation winding, the generated voltage of which is inserted in series in a line of a power system, a means for detecting an electric variable of the power system, and Command value generation means for receiving the output of the detection means to generate a voltage command value to be generated by the primary winding, and excitation means for receiving the output of the command value generation means to excite the secondary excitation winding. Compensation control device for the power system equipped. 3. The compensation control apparatus for the electric power system according to claim 1, wherein the electric variable detection unit includes a current detection unit for detecting a line current of the electric power system. 4. The electric power system according to claim 1, wherein the electric variable detection means includes electric power detection means for detecting electric power transmitted through the line of the electric power system. Compensation control device. 5. The command value generating means outputs a voltage vector command value composed of at least biaxial vector components to be generated by the primary winding, and excites the secondary excitation winding based on the voltage vector command value. The compensation control device for the electric power system according to claim 2, further comprising: 6. The secondary excitation current for determining the secondary excitation current is input to the excitation means by a voltage vector command value to be generated by the primary winding and a current of the primary winding or a proportional amount thereof. 6. The compensation control device for the electric power system according to claim 5, further comprising command means and secondary excitation current control means dependent on the command means. 7. The command value generating means generates a command value for causing a voltage command to be generated by the primary winding to include an in-phase component and an anti-phase component with respect to a current of the line, and the winding-type AC Equipped with speed detection means and speed control means of the machine,
7. The compensation control device for the electric power system according to claim 2, wherein the in-phase and anti-phase components are adjusted in response to the output of the speed control means. 8. An exciter AC machine coupled to a rotor of the wire-wound AC machine, and exciter power is exchanged between the exciter AC machine and the exciter means. The compensation control device for the electric power system according to claim 7.