CN103633623B - High voltage DC transformers and control method thereof - Google Patents
High voltage DC transformers and control method thereof Download PDFInfo
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- CN103633623B CN103633623B CN201310659469.1A CN201310659469A CN103633623B CN 103633623 B CN103633623 B CN 103633623B CN 201310659469 A CN201310659469 A CN 201310659469A CN 103633623 B CN103633623 B CN 103633623B
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Abstract
A kind of high voltage DC transformers and control method thereof, be made up of N platform isolated form low pressure dcdc converter.The high-pressure side of every isolated form low pressure dcdc converter comprises the first mechanical type by-pass switch (K1), low-pressure side comprises the second mechanical type by-pass switch (K2).When normally working, control system makes R platform isolated form low pressure dcdc converter be in redundant state, and remaining N R platform isolated form low pressure dcdc converter is in normal condition, 0 < R < N；When internal arbitrary isolated form low pressure dcdc converter breaks down, its high-pressure side the first mechanical type by-pass switch (K1) Guan Bi, low-pressure side the second mechanical type by-pass switch (K2) disconnect；No matter whether internal circuit breaks down, and any time only has N R platform isolated form low pressure dcdc converter to bear high-voltage dc voltage, does not affect input, output voltage when therefore certain partial circuit is bypassed.
Description
Technical field
The present invention relates to a kind of high reliability in HVDC (more than 10kV) power transmission and distribution field high voltage DC transformers and
Control method.
Background technology
HVDC (High Voltage Direct Current, the HVDC) technology of more than 10kV is commonly used to from a distance
Power plant transmits high-power power to electrical equipment, and transmission line of electricity can be overhead transmission line or submarine cable.When traditional exchange connection
When net scheme is infeasible, HVDC technology can be used for connecting two independent electrical networks.General HVDC transmission system ratio is handed over
Stream transmission system has lower cost and higher efficiency.In the middle of AC transmission system, can pass through along the line at power transmission line
Backbone network electric power is tapped to load by power transformer.But for HVDC transmission system, due to power transformer without
Method transmission direct current energy, when needs are to load supplying along the line it is generally required to set up current conversion station.But, the usual capacity of current conversion station is very
Greatly, distribution or the load tap of direct current power are not suitable for.
In existing high voltage DC transformers circuit topology scheme, it is generally individually by the input side direct current of low pressure DC-DC converter
Electric capacity is directly connected in series to HVDC side.Such as, United States Patent (USP) US 8345457, European patent EP 1184963A2,
Chinese patent CN 201830144 U, Chinese patent CN 102185480 A, Chinese patent CN 102522897 A etc. are at high pressure
DC side is all to have employed this scheme.
The shortcoming of these existing programs is, when a certain low pressure DC-DC converter breaks down or damage, if by its high pressure
This capacitance short-circuit then can directly be damaged this electric capacity by the DC capacitor bypass of input side；Simultaneously as total N platform DC-DC
The high-pressure side DC capacitor of changer is directly connected, if the high-pressure side DC capacitor of a DC-DC converter is bypassed, then holds
N-1 can be reduced to by the electric capacity quantity of high-voltage dc voltage, also just say, the unidirectional current that remaining electric capacity not broken down bears
Pressure can rise a height of original N/ (N-1), and this can affect the safe operation of DC capacitor；Further, due to each low voltage DC-DC
The input voltage of changer changes, and the output voltage of whole commutator transformer also can directly be affected.Therefore, existing specially
High voltage DC transformers scheme partial circuit the most therein in profit breaks down will defeated to whole high voltage DC transformers
Enter, output characteristics produces and has a strong impact on, and even causes damage, causes system out of service, it is difficult to realizes the event of main circuit part
Barrier redundancy and high reliability are run.
Summary of the invention
It is an object of the invention to overcome existing HVDC distribution system high voltage DC transformers is difficult to main circuit fault redundance
Run and cause the shortcoming that system reliability is low, propose a kind of high voltage DC transformers and control method thereof.The present invention is possible not only to
When damage or fault occurs in partial circuit within HVDC distribution system, it can be kept apart with remaining circuit, and not shadow
Ring the normal work of whole commutator transformer, also will not change the DC voltage level of high pressure and low-pressure side simultaneously, height can be improved
Straightening flows to low-voltage direct changer reliability of operation.
High voltage DC transformers of the present invention is made up of N platform isolated form low pressure DC-DC converter, and N is any positive integer.Wherein,
The high-pressure side first of described isolated form low pressure DC-DC converter connects terminal and second and connects between terminal and be parallel with the first machine
Tool formula by-pass switch；The low-pressure side the 3rd of described isolated form low pressure DC-DC converter connect terminal and the 4th connect terminal it
Between be in series with the second mechanical type by-pass switch；The high-pressure side first of First isolated form low pressure DC-DC converter connect terminal with
The positive pole of HVDC side links together；The high-pressure side second of N platform isolated form low pressure DC-DC converter connect terminal with
The negative pole of HVDC side links together；M platform isolated form low pressure DC-DC converter high-pressure side second connects terminal and
M+1 platform isolated form low pressure DC-DC converter high-pressure side first connects terminal and links together, 1 < m < N；N platform isolated form is low
Low-pressure side the 3rd connection terminal of pressure DC-DC converter connects jointly with the positive pole of low-voltage direct side；N platform isolated form is low
Low-pressure side the 4th connection terminal of pressure DC-DC converter connects jointly with the negative pole of low-voltage direct side.
High voltage DC transformers of the present invention be characterised by its isolated form low pressure DC-DC converter by mechanical type by-pass switch, half
Conductor switch, capacitor, high frequency transformer and passive device are constituted；First mechanical type by-pass switch and the second semiconductor switch
In parallel；First semiconductor switch and the second semiconductor switch are connected in series, and the emitter stage of the i.e. first semiconductor switch and the second half is led
The colelctor electrode of body switch is connected to the first connection terminal；It is commonly connected that first capacitor and the second capacitor are connected in series in first
Point；3rd semiconductor switch and the 4th semiconductor switch are connected in series, the emitter stage of the i.e. the 3rd semiconductor switch and the 4th quasiconductor
The colelctor electrode of switch is connected to the second points of common connection；It is commonly connected that 3rd capacitor and the 4th capacitor are connected in series in the 4th
Point；5th semiconductor switch and the 6th semiconductor switch are connected in series, the emitter stage of the i.e. the 5th semiconductor switch and the 6th quasiconductor
The colelctor electrode of switch is connected to the 3rd points of common connection；The colelctor electrode of the first semiconductor switch and the positive pole of the first capacitor, the 3rd
The colelctor electrode of semiconductor switch is connected to the 5th junction point；The emitter stage of the second semiconductor switch and the negative pole of the second capacitor,
The emitter stage of four semiconductor switch is connected to the second connection terminal；The colelctor electrode of the 5th semiconductor switch and the positive pole of the 3rd capacitor
It is connected to the 6th junction point；The emitter stage of the 6th semiconductor switch and the negative pole of the 4th capacitor are connected to the 4th connection terminal；The
One end of two mechanical formula by-pass switches is connected to the 6th junction point, and the other end of the second mechanical formula by-pass switch is as
Three connect terminal；First, second two points of common connection and the high-pressure side windings in series of the first passive device and high frequency transformer
Connect；3rd points of common connection and the 4th points of common connection and the low-pressure side windings in series of the second passive device and high frequency transformer
Connect.
Controlling high voltage DC transformers of the present invention to be realized by the control system of high voltage DC transformers, concrete grammar is as follows:
Described control method makes the R platform in high voltage DC transformers N platform isolated form low pressure DC-DC converter be in redundancy
Duty, and 0 < R < N；Under normal circumstances, high-pressure side first mechanical type of N platform isolated form low pressure DC-DC converter
By-pass switch is in off state, and its low-pressure side the second mechanical type by-pass switch is in closure state；Control at any one
In cycle processed, it is low that the high-pressure side of N-R platform isolated form low pressure DC-DC converter is connected in series to HVDC side, i.e. isolated form
Pressure on high-tension side first semiconductor switch of DC-DC converter is conducting state, and the second semiconductor switch is off state；With
Time, high-pressure side first semiconductor switch of remaining R platform isolated form low pressure DC-DC converter is off state, and the second half
Conductor switch is conducting state, i.e. the high-pressure side of R platform isolated form low pressure DC-DC converter is not connected in series in HVDC；
Due to the low-pressure side of every isolated form low pressure DC-DC converter be connected in parallel and inverter power can two-way flow, therefore
The high side voltage of N platform isolated form low pressure DC-DC converter is the most equal, and is equal to 1/ (N-R) of high-voltage dc voltage；When
When there is damage or fault in the inside of any one isolated form low pressure DC-DC converter, its on high-tension side first mechanical type bypass
Switch Guan Bi, the mechanical type by-pass switch of its low-pressure side disconnects simultaneously so that this module contacts cut-out with remainder circuit；
After the isolated form low pressure DC-DC converter broken down is bypassed, within any one control cycle, still only has N-R platform
The high-pressure side of isolated form low pressure DC-DC converter has been connected in series to HVDC side, does not interferes with whole HVDC transformation
The normal work of device, does not interferes with the nominal designed value of input, output voltage yet.It addition, the institute in commutator transformer of the present invention
The mechanical type by-pass switch is had to have only to bear low-voltage dc voltage, it is to avoid mechanical high-voltage dc switch is difficult to the tired of physics realization
Difficult.
Therefore, compared with existing high voltage DC transformers, the present invention can realize high voltage DC transformers interior section circuit and go out
During existing fault the most properly functioning, improve its reliability of operation, be particularly suited for the higher 10kV of reliability requirement with
On high-voltage direct current power grid power transmission and distribution field.
Accompanying drawing explanation
Fig. 1 is high voltage DC transformers circuit theory diagrams of the present invention.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
The circuit theory diagrams of high voltage DC transformers the most of the present invention, high voltage DC transformers of the present invention is by N platform isolated form
Low pressure DC-DC converter is constituted, and N is any positive integer.Wherein, the high pressure of described isolated form low pressure DC-DC converter
Side first connects terminal T1Terminal T is connected with second2Between be parallel with the first mechanical type by-pass switch K1；Described isolated form is low
The low-pressure side the 3rd of pressure DC-DC converter connects terminal T3Terminal T is connected with the 4th4Between be in series with second mechanical type bypass open
Close K2)；The high-pressure side first of First isolated form low pressure DC-DC converter connects terminal T1Connect with the positive pole of HVDC side
It is connected together；The high-pressure side second of N platform isolated form low pressure DC-DC converter connects terminal T2Negative pole with HVDC side
Link together；M platform isolated form low pressure DC-DC converter high-pressure side second connects terminal T2With m+1 platform isolated form
Low pressure DC-DC converter high-pressure side first connects terminal T1Link together, 1 < m < N；N platform isolated form low voltage DC-DC
The low-pressure side the 3rd of changer connects terminal T3Jointly connect with the positive pole of low-voltage direct side；N platform isolated form low voltage DC-DC
The low-pressure side the 4th of changer connects terminal T4Jointly connect with the negative pole of low-voltage direct side.
Isolated form low pressure DC-DC converter in high voltage DC transformers of the present invention is by mechanical type by-pass switch K1、K2, partly lead
Body switch S1-S6, capacitor C1-C4, high frequency transformer HFT and passive device Z1、Z2Constitute；First mechanical type bypass
Switch K1With the second semiconductor switch S2In parallel；First semiconductor switch S1 and the second semiconductor switch S2It is connected in series, i.e.
First semiconductor switch S1Emitter stage and the second semiconductor switch S2Colelctor electrode be connected to the first connection terminal T1；First electricity
Container C1With the second capacitor C2It is connected in series in the first points of common connection a；3rd semiconductor switch S3Open with the 4th quasiconductor
Close S4It is connected in series, the i.e. the 3rd semiconductor switch S3Emitter stage and the 4th semiconductor switch S4Colelctor electrode to be connected to second public
Junction point b altogether；3rd capacitor C3With the 4th capacitor C4Being connected in series, its junction point is the 4th points of common connection d；5th
Semiconductor switch S5With the 6th semiconductor switch S6It is connected in series, the i.e. the 5th semiconductor switch S5Emitter stage and the 6th quasiconductor
Switch S6Colelctor electrode be connected to the 3rd points of common connection c；First semiconductor switch S1Colelctor electrode and the first capacitor C1's
Positive pole, the 3rd semiconductor switch S3Colelctor electrode be connected to the 5th junction point P5；Second semiconductor switch S2Emitter stage and
Two capacitor C2Negative pole, the 4th semiconductor switch S4Emitter stage be connected to the second connection terminal T2；5th semiconductor switch
S5Colelctor electrode and the 3rd capacitor C3Positive pole be connected to the 6th points of common connection P6；6th semiconductor switch S6Emitter stage
With the 4th capacitor C4Negative pole be connected to the 4th connection terminal T4Second mechanical formula by-pass switch K2One end be connected to
Six points of common connection P6, the second mechanical formula by-pass switch K2The other end as the 3rd connect terminal T3；First, second
Two points of common connection a, b and the first passive device Z1And the high-pressure side windings in series of high frequency transformer HFT connects；3rd
Points of common connection c and the 4th points of common connection d and the second passive device Z2And the low-pressure side winding string of high frequency transformer HFT
Connection connects.
The control method of high voltage DC transformers of the present invention is as follows:
The present invention by the control system of high voltage DC transformers control described in high voltage DC transformers so that described in N platform every
R platform in release low pressure DC-DC converter is redundancy of effort state, and 0 < R < N；Under normal circumstances, HVDC transformation
The control system of device makes high-pressure side the first mechanical type by-pass switch K of N platform isolated form low pressure DC-DC converter1It is in closing
Disconnected state, and its low-pressure side the second mechanical type by-pass switch K2It is in closure state；Within any one control cycle, high
The control system of straightening convertor transformer makes the high-pressure side of N-R platform isolated form low pressure DC-DC converter be connected in series to high straightening
The control system of stream side, i.e. high voltage DC transformers makes on high-tension side first semiconductor switch of isolated form low pressure DC-DC converter
S1For conducting state, and the second semiconductor switch S2For off state；Meanwhile, the control system of high voltage DC transformers makes remaining
High-pressure side the first semiconductor switch S of R platform isolated form low pressure DC-DC converter1For off state, and the second quasiconductor is opened
Close S2For conducting state, even the high-pressure side of R platform isolated form low pressure DC-DC converter is not connected in series in HVDC；By
Low-pressure side in every isolated form low pressure DC-DC converter is connected in parallel and inverter power can two-way flow, therefore N
The high side voltage of platform isolated form low pressure DC-DC converter is the most equal, and is equal to 1/ (N-R) of high-voltage dc voltage；When appointing
When there is damage or fault in the inside of an isolated form low pressure DC-DC converter of anticipating, the control system order of high voltage DC transformers
Its on high-tension side first mechanical type by-pass switch K1Guan Bi, with the mechanical type by-pass switch K of its low-pressure side in season2Disconnect so that
Be damaged or fault isolated form low pressure DC-DC converter and remainder circuit contact cut-out；The isolation broken down
After type low pressure DC-DC converter is bypassed, within any one control cycle, still only has N-R platform isolated form low pressure
The high-pressure side of DC-DC converter has been connected in series to HVDC side, does not interferes with the normal work of whole high voltage DC transformers
Make, also do not interfere with the nominal designed value of input, output voltage.
The detailed description of the invention of the present invention is further illustrated: HVDC as a example by the high voltage DC transformers of a 16kV/750V
Voltage is 16kV, and low-voltage dc voltage is 750V, contains 18 isolated form low pressure DC-DC converter, i.e. N=18 altogether；
The isolated form low pressure DC-DC converter of 2 redundancies, i.e. R=2 are set；Assume isolated form low pressure DC-DC converter simultaneously
The control cycle is 1/10kHz=0.1ms, then:
(1) under normal circumstances, the high-pressure side mechanical type by-pass switch K of 18 isolated form low pressure DC-DC converter1All locate
In off state, and its low-pressure side mechanical type by-pass switch K2It is in closure state, the control cycle of any one 0.1ms
In, high-pressure side only has the high-pressure side capacitances in series of 16 isolated form low pressure DC-DC converter to be connected to HVDC side all the time,
Voltage on each electric capacity is 16kV/16=1000V；And the high-pressure side of remaining 2 isolated form low pressure DC-DC converter by
In S2In the conduction state, its capacitance voltage is obtained energy support by DC-DC converter from low-pressure side, is also 1000V.
(2) when damage or fault occurs in the inside of any one isolated form low pressure DC-DC converter in 18, it is high
The mechanical type by-pass switch K of pressure side1Close immediately, simultaneously the mechanical type by-pass switch K of its low-pressure side2Disconnect immediately so that send out
The isolated form low pressure DC-DC converter of raw damage or fault contacts cut-out with remainder circuit；The isolated form of this fault is low
After pressure DC-DC converter is bypassed, state normal isolated form low pressure DC-DC converter still has 17, and arbitrarily
Still the high-pressure side of 18-2=16 platform isolated form low pressure DC-DC converter is only had to be connected in series in one 0.1ms control cycle
HVDC side, thus without affecting the normal work of whole high voltage DC transformers, high-pressure side remains 16 isolated forms
The high-pressure side electric capacity of low pressure DC-DC converter bears high-voltage dc voltage 16kV, and therefore output voltage also will not change.
Claims (1)
1. a control method for high voltage DC transformers, described high voltage DC transformers is by N platform isolated form low voltage DC-DC
Changer is connected by high-pressure side, low-pressure side parallel connection is constituted, and N is any positive integer；Described isolated form low voltage DC-DC becomes
The high-pressure side of parallel operation first connects terminal (T1) and the second connection terminal (T2The first mechanical type by-pass switch (K it is parallel with between)1)；
The low-pressure side the 3rd of described isolated form low pressure DC-DC converter connects terminal (T3) and the 4th connection terminal (T4Between)
It is in series with the second mechanical type by-pass switch (K2)；The high-pressure side first of First isolated form low pressure DC-DC converter connects terminal
(T1) link together with the positive pole of HVDC side；The high-pressure side second of N platform isolated form low pressure DC-DC converter is even
Connecting terminal (T2) link together with the negative pole of HVDC side；M platform isolated form low pressure DC-DC converter high-pressure side
Two connect terminal (T2) it is connected terminal (T with m+1 platform isolated form low pressure DC-DC converter high-pressure side first1) be connected to
Together, 1 < m < N；The low-pressure side the 3rd of N platform isolated form low pressure DC-DC converter connects terminal (T3) and low-voltage direct side
Positive pole jointly connect；The low-pressure side the 4th of N platform isolated form low pressure DC-DC converter connects terminal (T4) and low pressure
The negative pole of DC side connects jointly；
Described isolated form low pressure DC-DC converter is by mechanical type by-pass switch (K1、K2), semiconductor switch (S1-S6)、
Capacitor (C1-C4), high frequency transformer (HFT) and passive device (Z1、Z2) constitute；First mechanical type by-pass switch
(K1) and the second semiconductor switch (S2) in parallel；First semiconductor switch (S1) and the second semiconductor switch (S2) series connection
Connect, the i.e. first semiconductor switch (S1) emitter stage and the second semiconductor switch (S2) colelctor electrode be connected to the first connection
Terminal (T1)；First capacitor (C1) and the second capacitor (C2) be connected in series, junction point is the first points of common connection (a)；
3rd semiconductor switch (S3) and the 4th semiconductor switch (S4) be connected in series, the i.e. the 3rd semiconductor switch (S3) transmitting
Pole and the 4th semiconductor switch (S4) colelctor electrode be connected to the second points of common connection (b)；3rd capacitor (C3) with the 4th
Capacitor (C4) be connected in series, its points of common connection is the 4th points of common connection (d)；5th semiconductor switch (S5) and the
Six semiconductor switch (S6) be connected in series, the i.e. the 5th semiconductor switch (S5) emitter stage and the 6th semiconductor switch (S6)
Colelctor electrode be connected to the 3rd points of common connection (c)；First semiconductor switch (S1) colelctor electrode and the first capacitor (C1)
Positive pole, the 3rd semiconductor switch (S3) colelctor electrode be connected to the 5th junction point (P5)；Second semiconductor switch (S2)
Emitter stage and the second capacitor (C2) negative pole, the 4th semiconductor switch (S4) emitter stage be connected to the second connection terminal
(T2)；5th semiconductor switch (S5) colelctor electrode and the 3rd capacitor (C3) positive pole be connected to the 6th junction point (P6)；
6th semiconductor switch (S6) emitter stage and the 4th capacitor (C4) negative pole be connected to the 4th connection terminal (T4)；The
Two mechanical formula by-pass switch (K2) one end be connected to the 6th junction point (P6), the second mechanical formula by-pass switch (K2)
The other end as the 3rd connect terminal (T3)；First, second two points of common connection (a, b) and the first passive device (Z1)
And the high-pressure side windings in series of high frequency transformer (HFT) connects；3rd points of common connection (c) and the 4th points of common connection
(d) and the second passive device (Z2) and the low-pressure side windings in series connection of high frequency transformer (HFT)；
It is characterized in that described control method is: in described high voltage DC transformers, N platform isolated form low voltage DC-DC becomes
R platform in parallel operation is redundancy of effort state, and 0 < R < N；Under normal circumstances, N platform isolated form low pressure DC-DC converter
High-pressure side the first mechanical type by-pass switch (K1) it is in off state, and its low-pressure side the second mechanical type by-pass switch (K2)
It is in closure state；Within any one control cycle, the high-pressure side series connection of N-R platform isolated form low pressure DC-DC converter
It is connected to the on high-tension side first semiconductor switch (S in HVDC side, i.e. isolated form low pressure DC-DC converter1) for turning on shape
State, and the second semiconductor switch (S2) it is off state；Meanwhile, remaining R platform isolated form low pressure DC-DC converter
High-pressure side the first semiconductor switch (S1) it is off state, and the second semiconductor switch (S2) be conducting state, i.e. R platform every
The high-pressure side of release low pressure DC-DC converter is not connected in series in HVDC；Due to every isolated form low voltage DC-DC conversion
The low-pressure side of device is connected in parallel and inverter power can two-way flow, therefore N platform isolated form low pressure DC-DC converter
High side voltage is the most equal, and is equal to 1/ (N-R) of high-voltage dc voltage；When any one isolated form low voltage DC-DC converts
When there is damage or fault in the inside of device, its on high-tension side first mechanical type by-pass switch (K1) Guan Bi, simultaneously its low-pressure side
Mechanical type by-pass switch (K2) disconnect so that it is damaged or the isolated form low pressure DC-DC converter of fault and remainder
The contact of circuit is cut off；After the isolated form low pressure DC-DC converter of this fault is bypassed, within any one control cycle
Still the high-pressure side of N-R platform isolated form low pressure DC-DC converter is only had to be connected in series to HVDC side, not affect whole
The normal work of high voltage DC transformers, nor affects on the nominal designed value of input voltage, output voltage.
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| CN201310659469.1A CN103633623B (en) | 2013-12-08 | 2013-12-08 | High voltage DC transformers and control method thereof |
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