CN105896585B - A kind of Polynuclear complex system exchange side fault traversing control method - Google Patents
A kind of Polynuclear complex system exchange side fault traversing control method Download PDFInfo
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Abstract
The present invention provides a kind of Polynuclear complex system exchange side fault traversing control method.It uses constant DC current control, an Inverter Station MMC that the control for determining DC voltage, remaining Inverter Station MMC is selected to select on the Baseline Control Strategy of constant DC current control in converting plant LCC, the control of highest vertical compression is configured for converting plant LCC；To select each Inverter Station MMC of constant DC current control to configure current limiting low-voltage control.The beneficial effects of the invention are as follows：For the exchange side failure of Hybrid HVDC system any one end current conversion station, converting plant and each Inverter Station respectively take corresponding action (decentralised control) to coordinate the power distribution between each station, and DC voltage and current stabilization is controlled, no vertical compression overvoltage, low pressure ovennodulation risk.The present invention handles AC fault and is not necessarily to quick interior communication, and controller architecture is simple, parameter tuning is convenient, is conveniently used for engineering practice.
Description
Technical field
It is mixed based on line commutation transverter LCC and modular multi-electrical-level voltage source current converter MMC that the present invention relates to a kind of
DC transmission system is closed, high voltage power transmission technical field is belonged to.
Background technology
Based on line commutation transverter (LCC：Line Commutated Converter) Traditional DC technology of transmission of electricity tool
Have the advantages that technology maturation, at low cost, overload energy is strong, but there is also commutation failure, harmonic content is big, needs reactive-load compensation etc.
Problem；Based on modular multi-electrical-level voltage source current converter (MMC：Modular Multi-level Converter) flexibility it is straight
Flow technology of transmission of electricity, can separately adjustable active reactive power, have superior controllability and flexibility, be solve receiving end power grid it is thin
Weak, the passive powered effective way of power grid, however flexible direct current technical costs is high, loss is big, control is complicated.Multi-terminal HVDC transmission
System refers to the DC transmission system containing more than two current conversion stations under same direct current rack.Its outstanding feature is can
The more drop points of multiple feed are realized by electricity, as a kind of more flexible, efficiently power transmission mode, in new-energy grid-connected, constructs city
The fields such as DC distribution net have broad application prospects.
A kind of Polynuclear complex system topology comprising one 12 pulsation converting plant LCC and two and with
Upper Inverter Station MMC, because there is flexible direct current fast response time, the advantages such as control accuracy height usually to select an Inverter Station MMC fixed
DC voltage control, 12 pulsation converting plant LCC and remaining Inverter Station MMC select constant DC current control.It is more for above-mentioned mixing
The control strategy of DC transmission system, control system is held to have the following technical problems：When the exchange system of 12 pulsation converting plant LCC
System breaks down, and the detectability of converting plant LCC be less than all Inverter Station MMC transimission powers and when, DC voltage can continue
Decline, too low DC voltage can cause flexible direct current system ovennodulation, control effect to be deteriorated, and harmonic wave is conveyed to AC system；
Determine the AC system of DC voltage Inverter Station MMC when selecting and break down, and the transmission power ability of Inverter Station MMC1 is serious
When limitation, DC voltage will continue to rise, and causing flexible direct current, there are the risks of module capacitance over-voltage breakdown.
Therefore the present invention proposes a kind of Polynuclear complex system in the control method of exchange side failure, and mixing is straight
When temporary AC fault occurs in the AC system of arbitrary current conversion station side in streaming system, Polynuclear complex system is using this
The technical solution of invention both without over-voltage breakdown danger, will not because DC voltage is too low and ovennodulation even collapse, can
It is steady to complete fault traversing, and it can be promptly restored to pre-fault status after a failure.This method is using control means on the spot, nothing
Rapid communication is needed, the reliability and low cost of effective guarantee control are capable of.
Invention content
The purpose of the application is to provide a kind of Polynuclear complex system exchange side fault traversing control method, so as to
Enable Polynuclear complex system steadily to complete AC fault to pass through, it is ensured that multiterminal mixed DC system is without vertical compression mistake
Pressure, low pressure ovennodulation risk.
The present invention specifically uses following technical scheme：
A kind of Polynuclear complex system exchange side fault traversing control method, the Polynuclear complex system
System includes multiterminal current conversion station, i.e. a converting plant LCC and at least two Inverter Station MMC, the converting plant LCC are for by exchange side
Electric energy rectification is direct current energy and sends it to DC link, and the Inverter Station MMC is used for the DC link
Electric energy inversion be AC energy and to inject corresponding AC network；It is characterized in that：
Constant DC current control, an Inverter Station MMC is used to select constant DC voltage control in converting plant LCC, remaining is inverse
Become station MMC to select on the Baseline Control Strategy of constant DC current control, configures the control of highest vertical compression for converting plant LCC, setting is most
The direct voltage reference value of high vertical compression control, to select each Inverter Station MMC of constant DC current control to configure current limiting low-voltage control,
Current limiting low-voltage control parameter is set.
The exchange side fault traversing control method of the present invention includes the following steps：
Step 1：Constant DC current control, an Inverter Station MMC is used to select constant DC voltage control in converting plant LCC,
Remaining Inverter Station MMC is selected on the Baseline Control Strategy of constant DC current control, and the control of highest vertical compression is configured for converting plant LCC,
To select each Inverter Station MMC of constant DC current control to configure current limiting low-voltage control；
Step 2：The direct voltage reference value of converting plant LCC highest vertical compressions control is set；
Step 3：The current limiting low-voltage control parameter of the Inverter Station MMC of constant DC current control is set：DC voltage is normal
When range of operation, DC current reference value remains unchanged, and DC voltage is less than preset normal operation range and straight higher than minimum
When galvanic electricity is pressed, DC current reference value and DC voltage are in a linear relationship, when DC voltage is equal to or less than minimum DC voltage,
DC current reference value is 0；
Step 4：Polynuclear complex system normal operation, converting plant LCC occur exchange side failure, enter step 5；
It selects the Inverter Station MMC of constant DC voltage control that exchange side failure occurs, enters step 6；Select the inverse of constant DC current control
Become station MMC and exchange side failure occurs, enters step 7：
Step 5：In rectification side AC fault, Polynuclear complex system determines DC current by converting plant LCC
Control reduces the Trigger Angle of converting plant LCC, the constant DC voltage control of constant DC voltage control Inverter Station MMC is selected to reduce selection
The inverter power of constant DC voltage control Inverter Station MMC, and select the Inverter Station MMC of constant DC current control will be according to low pressure
Current limited Control parameter reduces the DC current reference value of constant DC current control, stable DC voltage, subsequently into step 8；
Step 6：When slight AC fault occurs for the Inverter Station MMC for selecting constant DC voltage control, multiterminal element is mixed
The highest vertical compression control that transmission system passes through the constant DC voltage control and converting plant LCC of constant DC voltage control Inverter Station MMC
The Trigger Angle minimum amplitude limit that system increases converting plant LCC constant DC current controls carrys out stable DC voltage, subsequently into step 8；
Step 7：When AC fault occurs for the Inverter Station MMC exchange side of remaining selection constant DC current control, mixing is more
End DC transmission system determines direct current by selecting the constant DC current control of the Inverter Station MMC of constant DC current control and selecting
The constant DC voltage control of voltage-controlled Inverter Station MMC carrys out stable DC voltage, subsequently into step 8；
Step 8：After rectification side or inverter side AC fault are eliminated, each current conversion station will restore former normal operation and control plan
Slightly, i.e. converting plant LCC uses constant DC voltage control, remaining Inverter Station using constant DC current control, an Inverter Station MMC
MMC uses constant DC current control, the operation of Polynuclear complex system normal table.
Present invention preferably comprises following scheme
In steps of 5, including in detail below content：
(1) Polynuclear complex system determines DC voltage by converting plant LCC constant DC current controls, selection first
The constant DC voltage control of Inverter Station MMC is controlled, reduces the Trigger Angle of converting plant LCC and reduces and select constant DC voltage control
The inverter power of Inverter Station MMC maintains the DC voltage of Polynuclear complex system in preset reference value, otherwise enters
(2)；
(2) it when the DC voltage of Polynuclear complex system is less than normal operation DC voltage range, selects fixed straight
The Inverter Station MMC of galvanic electricity flow control refers to the DC current for reducing constant DC current control according to current limiting low-voltage control parameter
Value reduces DC current, maintains DC voltage in preset minimum.
In step 6, including in detail below content：
(1) Polynuclear complex system is first by constant DC voltage control Inverter Station MMC by determining DC voltage
Control maintains the DC voltage of Polynuclear complex system in preset reference value, otherwise enters (2)；
(2) when the DC voltage of Polynuclear complex system is higher than normal operation DC voltage range, converting plant
The highest vertical compression control of LCC will increase the Trigger Angle minimum amplitude limit of converting plant LCC constant DC current controls, and DC voltage is maintained to exist
Preset peak.
The present invention has technique effect beneficial below：
When temporary AC fault occurs in the AC system of arbitrary current conversion station side, Polynuclear complex system uses
Technical scheme of the present invention both without over-voltage breakdown danger, will not because DC voltage is too low and ovennodulation even collapse, energy
Enough steady completion fault traversings, and it can be promptly restored to pre-fault status after a failure.This method uses control means on the spot,
Without rapid communication, it is capable of the reliability and low cost of effective guarantee control.
Description of the drawings
Fig. 1 is the mixing MTDC transmission system topological diagram based on LCC and MMC；
Fig. 2 is Polynuclear complex system exchange side fault traversing control method flow chart disclosed by the invention；Fig. 3
It is the control block diagram of converting plant LCC；
Fig. 4 is the control block diagram for the Inverter Station MMC for selecting constant DC current control；
Fig. 5 is converting plant LCC external characteristic curve figures；
Fig. 6 is Inverter Station MMC1 external characteristic curve figures；
Fig. 7 is Inverter Station MMC2 external characteristic curve figures；
External characteristic curve figure when Fig. 8 is converting plant LCC exchange side failures；
External characteristic curve figure when Fig. 9 is Inverter Station MMC1 exchange side failures；
External characteristic curve figure when Figure 10 is Inverter Station MMC2 exchange side failures.
Specific implementation mode：
The technical solution of the application is described in further detail with specific embodiment with reference to the accompanying drawings of the specification.
The invention discloses a kind of Polynuclear complex system exchange side fault traversing control method, the mixing is more
Hold DC transmission system as shown in Fig. 1, including multiterminal current conversion station, i.e. a converting plant LCC and at least two Inverter Station MMC,
The converting plant LCC, which is used for, to be direct current energy by exchange side electric energy rectification and sends it to DC link, the Inverter Station
MMC, which is used for, to be AC energy by the electric energy inversion of the DC link and injects corresponding AC network.
Constant DC current control, an Inverter Station MMC is used to select constant DC voltage control in converting plant LCC, remaining is inverse
Become station MMC to select on the Baseline Control Strategy of constant DC current control, configures the control of highest vertical compression for converting plant LCC, setting is most
The direct voltage reference value of high vertical compression control, when the highest vertical compression of converting plant LCC configurations is controlled in DC voltage higher than preset
When normal operating voltage range, increase the Trigger Angle minimum amplitude limit of converting plant LCC constant DC current controls, DC voltage is maintained to exist
Preset peak.
To select each Inverter Station MMC of constant DC current control to configure current limiting low-voltage control, setting current limiting low-voltage controls ginseng
Number：Determine the correspondence of Inverter Station the MMC DC currents desired value and DC voltage of constant DC current control；Determine DC current
The current limiting low-voltage control of the Inverter Station MMC of control reduces and selects when DC voltage is less than preset normal operating voltage range
The DC current reference value of the Inverter Station MMC of constant DC current control maintains DC voltage in preset minimum.
Converting plant LCC judges whether to increase the Trigger Angle of converting plant LCC constant DC current controls in real time according to DC voltage
Minimum amplitude limit, the Inverter Station MMC of constant DC current control judge whether to reduce DC current reference value in real time according to DC voltage.
For the technical solution of the application Polynuclear complex system exchange side fault traversing control method is discussed in detail,
The application is using topological structure shown in Fig. 1 as embodiment, wherein current conversion station LCC is converting plant, and L1, L12 are the flat wave electricity of DC line
Anti- device, T1, T12 are its converter power transformers, and UF is wave filter on AC side, and AC1 is the AC system that our station is accessed；MMC1,
MMC2 is Inverter Station, and L2, L3 are bridge arm reactors, and T2, T3 are converter power transformers, and AC2, AC3 are the AC systems of its access.
The technical solution control flow of the application is as shown in Fig. 2, includes the following steps：
Step 1：Constant DC current control, an Inverter Station MMC is used to select constant DC voltage control in converting plant LCC,
Remaining Inverter Station MMC is selected on the Baseline Control Strategy of constant DC current control, and the control of highest vertical compression is configured for converting plant LCC,
To select each Inverter Station MMC of constant DC current control to configure current limiting low-voltage control.The input of converting plant LCC highest vertical compressions control
For highest vertical compression reference value (Vdc_ref) and current DC voltage (Vdc), the output of highest vertical compression control is converting plant LCC fixed straight
The Trigger Angle minimum amplitude limit (α of galvanic electricity flow controlmin).While property, highest is connected for series thyristor in guarantee converter valve simultaneously
Output (the Trigger Angle minimum amplitude limit α of vertical compression controlmin) it cannot be below minimum trigger angle (αmin_ref).The controller chassis of converting plant LCC
Figure is shown in Fig. 3.I in Fig. 3dc_refIndicate the DC current reference of converting plant LCC constant DC current controls, IdcIndicate that converting plant LCC is straight
Galvanic electricity stream, α indicate Trigger Angle.The current limiting low-voltage of the Inverter Station MMC of constant DC current control controls, and inputs as raw DC electric current
Instruct (Idc_ref) and current DC voltage (Vdc), export the final DC current instruction inputted for constant current control
(Idc_ref*).The control block diagram of the Inverter Station MMC of constant DC current control is shown in Fig. 4.I in Fig. 4dcIndicate constant DC current control
The DC current of Inverter Station MMC, IdrefIndicate the D shaft currents reference for being output to inner ring of constant DC current control.By above-mentioned control
The external characteristics for each current conversion station that mode processed is set is successively as shown in Fig. 5, Fig. 6 and Fig. 7.In figure, longitudinal axis Udc indicates DC voltage,
Horizontal axis Idc indicates DC current, and Udc_nor indicates standard DC voltage when normal operation, when Udc_min indicates normal operation
Minimum DC voltage, I_LCC_max indicate converting plant LCC DC current maximum value, I_M1_max expression determine DC voltage
Inverter Station MMC DC current maximum value, I_M2_max indicate determine DC current Inverter Station MMC DC current maximum
Value.
Step 2：The direct voltage reference value for designing the control of converting plant LCC highest vertical compressions need to consider that mixing multiterminal element is defeated
The DC break down voltage and insulating capacity of electric system.When the usual value of direct voltage reference value of highest vertical compression control presets normal operation
The DC voltage upper limit.For example, the rated direct voltage that the direct voltage reference value for choosing the control of highest vertical compression is 1.05 times.
Step 3：The current limiting low-voltage control parameter of DC current Inverter Station MMC is determined in design.According to Hybrid HVDC system
Mathematical model and operation characteristic, the DC current desired values of Inverter Station MMC constant DC current controls should be in line with DC voltage
Sexual intercourse.After considering the voltage fluctuation of certain nargin and the minimum DC voltage limitation of Hybrid HVDC system, determine fixed straight
The correspondence of Inverter Station the MMC DC currents desired value and DC voltage of galvanic electricity flow control, the i.e. current limiting low-voltage of Inverter Station MMC
Control parameter is arranged.
It illustrates：Assuming that existing Polynuclear complex system, when normal operation, DC voltage fluctuation is ranging from
0.95p.u. to 1.05p.u. ensures that the minimum DC voltage of Inverter Station MMC not ovennodulations is 0.7p.u. according to design requirement.
Then designing current limiting low-voltage control is：
K is current limiting low-voltage control parameter in above formula.
Step 4：Polynuclear complex system normal operation, converting plant LCC occur exchange side failure, enter step 5；
It selects the Inverter Station MMC of constant DC voltage control that exchange side failure occurs, enters step 6；Select the inverse of constant DC current control
Become station MMC and exchange side failure occurs, enters step 7：
Step 5：In converting plant LCC AC faults,
(1) Polynuclear complex system determines DC voltage by converting plant LCC constant DC current controls, selection first
The constant DC voltage control of Inverter Station MMC is controlled, reduces the Trigger Angle of converting plant LCC and reduces and select constant DC voltage control
The inverter power of Inverter Station MMC, it is ensured that the DC voltage of Polynuclear complex system remains constant.Converting plant LCC's touches
Sending out angle will reduce, but be limited by alternating voltage and minimum trigger angle, and the DC voltage and DC current of converting plant LCC all can be
Decline.As shown in figure 8, LCC stable operating points will be moved from A points to G points；Select determining for constant DC voltage control Inverter Station MMC
DC voltage control by reduce inverter power ensure Inverter Station MMC DC voltage maintain it is constant, constant DC voltage control it is inverse
Becoming station MMC DC currents can also reduce.As shown in figure 9, the Inverter Station MMC stable operating points of constant DC voltage control will be by C points
It is moved to D points.Otherwise enter (2)
(2) when the DC voltage of Polynuclear complex system is less than normal operation DC voltage range, determine direct current
Voltage-controlled Inverter Station MMC loses the control ability to DC voltage, as shown in figure 9, the Inverter Station of constant DC voltage control
MMC stable operating points will be from D points to D0Point movement.Select the Inverter Station MMC of constant DC current control will be according to current limiting low-voltage control
Parameter processed reduces the DC current reference value of constant DC current control, is maintained by reducing DC current by DC voltage default
Minimum.The DC current of the Inverter Station MMC of constant DC current control can decline, as shown in Figure 10, constant DC current control
Inverter Station MMC stable operating point will from E points to F points move.Subsequently into step 8.
Step 6：When selecting the Inverter Station MMC of constant DC voltage control that AC fault occurs,
(1) DC voltage is maintained by selecting the constant DC voltage control of the Inverter Station MMC of constant DC voltage control first
Constant, each stable operating point of standing will remain unchanged；Otherwise enter (2)
(2) when the DC voltage of Polynuclear complex system is higher than normal operation DC voltage range, determine direct current
Voltage-controlled Inverter Station MMC is forced down by its alternating current to be influenced, and DC current will reduce, as shown in figure 9, constant DC voltage control
Inverter Station MMC stable operating point will from C points to H points move.The highest vertical compression control of converting plant LCC will increase converting plant
The Trigger Angle minimum amplitude limit of LCC constant DC current controls, makes DC voltage maintain preset peak.It is increased by DC voltage
It influences, the DC current of converting plant LCC will reduce, as shown in figure 8, LCC stable operating points are from A to M.Constant DC current control
Inverter Station MMC can keep our station DC current constant, but our station DC voltage will rise with other stations, as shown in Figure 10,
The Inverter Station MMC stable operating points of constant DC current control are moved from E to I.Movement is subsequently into step 8.
Step 7：When AC fault occurs for the Inverter Station MMC exchange side of remaining selection constant DC current control, then select
The Inverter Station MMC of constant DC current control by constant DC current control, will select the Inverter Station MMC of constant DC voltage control logical
Cross constant DC voltage control, it is ensured that the DC voltage of Polynuclear complex system remains constant.Constant DC current control
Inverter Station MMC is forced down by its alternating current to be influenced, and DC current will decline, and as shown in Figure 10, stable operating point is moved from E to K.
The Inverter Station MMC of constant DC voltage control increases inverter power by constant DC voltage control, and DC current will increase, such as Fig. 9
Shown, stable operating point is moved stable operating point from C points to J points.Subsequently into step 8.
Step 8：After converting plant or Inverter Station AC fault are eliminated, each current conversion station will restore former normal operation control,
I.e. Polynuclear complex system will be used using constant DC current control, an Inverter Station MMC in converting plant LCC and be determined direct current
Voltage controls, remaining Inverter Station MMC uses constant DC current control, and Polynuclear complex system is in converting plant and Inverter Station
Standard operating status is restored under the collective effect of control.
It is detailed description of the present invention to embodiment above, despite for above-mentioned specific embodiment, it should be apparent that
Not departing from can make various changes and modifications within the scope of the disclosure of the claims restriction.
Claims (5)
1. a kind of Polynuclear complex system exchange side fault traversing control method, the Polynuclear complex system
Including multiterminal current conversion station, i.e. a converting plant LCC and at least two Inverter Station MMC, the converting plant LCC are used for exchange side is electric
Energy rectification is direct current energy and sends it to DC link, and the Inverter Station MMC is used for the DC link
Electric energy inversion is AC energy and injects corresponding AC network；It is characterized in that：
Constant DC current control, an Inverter Station MMC is used to select constant DC voltage control, remaining Inverter Station in converting plant LCC
MMC is selected on the Baseline Control Strategy of constant DC current control, configures the control of highest vertical compression for converting plant LCC, setting highest is straight
The direct voltage reference value of voltage-controlled system, to select each Inverter Station MMC of constant DC current control to configure current limiting low-voltage control, setting
Current limiting low-voltage control parameter；
The direct voltage reference value of highest vertical compression control is set, and the highest vertical compression of converting plant LCC configurations is controlled in DC voltage height
When preset normal operating voltage range, increase the Trigger Angle minimum amplitude limit of converting plant LCC constant DC current controls, remains straight
Galvanic electricity is pressed in preset peak.
2. Polynuclear complex system exchange side fault traversing control method according to claim 1, feature exist
In：
The correspondence for determining Inverter Station the MMC DC currents desired value and DC voltage of constant DC current control, that is, be arranged inverse
Become the current limiting low-voltage control parameter of station MMC；The current limiting low-voltage control of the Inverter Station MMC of constant DC current control is forced down in direct current
When preset normal operating voltage range, reduce the DC current reference value for the Inverter Station MMC for selecting constant DC current control,
Maintain DC voltage in preset minimum.
3. a kind of Polynuclear complex system exchange side fault traversing control method, the Polynuclear complex system
Including multiterminal current conversion station, i.e. a converting plant LCC and at least two Inverter Station MMC, the converting plant LCC are used for exchange side is electric
Energy rectification is direct current energy and sends it to DC link, and the Inverter Station MMC is used for the DC link
Electric energy inversion is AC energy and injects corresponding AC network；It is characterized in that, the exchange side fault traversing control
Method includes the following steps：
Step 1：Constant DC current control, an Inverter Station MMC is used to select constant DC voltage control in converting plant LCC, remaining
Inverter Station MMC is selected on the Baseline Control Strategy of constant DC current control, the control of highest vertical compression is configured for converting plant LCC, for choosing
With each Inverter Station MMC configuration current limiting low-voltage controls of constant DC current control；
Step 2：The direct voltage reference value of converting plant LCC highest vertical compressions control is set；
Step 3：The current limiting low-voltage control parameter of the Inverter Station MMC of constant DC current control is set：DC voltage is in normal operation
When range, DC current reference value remains unchanged, and DC voltage is less than preset normal operation range and is higher than minimum direct current
When pressure, DC current reference value and DC voltage are in a linear relationship, when DC voltage is equal to or less than minimum DC voltage, direct current
Current reference value is 0；
Step 4：Polynuclear complex system normal operation, converting plant LCC occur exchange side failure, enter step 5；It selects
Exchange side failure occurs for the Inverter Station MMC of constant DC voltage control, enters step 6；Select the Inverter Station of constant DC current control
Exchange side failure occurs for MMC, enters step 7：
Step 5：In rectification side AC fault, Polynuclear complex system passes through converting plant LCC constant DC current controls
It is fixed straight that the Trigger Angle for reducing converting plant LCC, the constant DC voltage control for selecting constant DC voltage control Inverter Station MMC reduce selection
The inverter power of the voltage-controlled Inverter Station MMC processed of galvanic electricity, and select the Inverter Station MMC of constant DC current control will be according to current limiting low-voltage
Control parameter reduces the DC current reference value of constant DC current control, stable DC voltage, subsequently into step 8；
Step 6：When slight AC fault occurs for the Inverter Station MMC for selecting constant DC voltage control, Polynuclear complex
System is controlled and is increased by the constant DC voltage control of constant DC voltage control Inverter Station MMC and the highest vertical compression of converting plant LCC
The Trigger Angle minimum amplitude limit of big converting plant LCC constant DC current controls carrys out stable DC voltage, subsequently into step 8；
Step 7：When AC fault occurs for the Inverter Station MMC exchange side of remaining selection constant DC current control, mixing multiterminal are straight
Stream transmission system determines DC voltage by selecting the constant DC current control of the Inverter Station MMC of constant DC current control and selecting
The constant DC voltage control of the Inverter Station MMC of control carrys out stable DC voltage, subsequently into step 8；
Step 8：After rectification side or inverter side AC fault are eliminated, each current conversion station will restore former normal operation control strategy,
That is converting plant LCC uses constant DC voltage control, remaining Inverter Station MMC to adopt using constant DC current control, an Inverter Station MMC
With constant DC current control, the operation of Polynuclear complex system normal table.
4. Polynuclear complex system exchange side fault traversing control method according to claim 3, feature exist
In：
In steps of 5, including in detail below content：
(1) Polynuclear complex system passes through converting plant LCC constant DC current controls, selection constant DC voltage control first
The constant DC voltage control of Inverter Station MMC reduces the Trigger Angle of converting plant LCC and reduces and selects constant DC voltage control inversion
It stands the inverter power of MMC, maintains the DC voltage of Polynuclear complex system in preset reference value；Otherwise enter (2)；
(2) when the DC voltage of Polynuclear complex system is less than normal operation DC voltage range, direct current is determined in selection
The Inverter Station MMC of flow control will reduce the DC current reference value of constant DC current control according to current limiting low-voltage control parameter, subtract
Small DC current maintains DC voltage in preset minimum.
5. Polynuclear complex system exchange side fault traversing control method according to claim 3, feature exist
In：
In step 6, including in detail below content：
(1) Polynuclear complex system is first by constant DC voltage control Inverter Station MMC by constant DC voltage control,
Maintain the DC voltage of Polynuclear complex system in preset reference value；Otherwise enter (2)；
(2) when the DC voltage of Polynuclear complex system is higher than normal operation DC voltage range, converting plant LCC is most
High vertical compression control will increase the Trigger Angle minimum amplitude limit of converting plant LCC constant DC current controls, maintain DC voltage preset
Peak.
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| CN104993509B (en) * | 2015-07-20 | 2017-07-25 | Abb技术有限公司 | Polynuclear complex system and its Inverter Station and control method |
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