CN110912173B - VSC direct-current power grid control method - Google Patents
VSC direct-current power grid control method Download PDFInfo
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- CN110912173B CN110912173B CN201911104248.1A CN201911104248A CN110912173B CN 110912173 B CN110912173 B CN 110912173B CN 201911104248 A CN201911104248 A CN 201911104248A CN 110912173 B CN110912173 B CN 110912173B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a control method of a VSC direct current power grid, which defines that a first-stage control is the control adopted by the outermost converter station in the VSC direct current power grid, defines that a second-stage control is the converter station connected with the first-stage converter station through a high-voltage direct current line, the alternating current side of the converter station in the second-stage control is connected with a weak alternating current power grid, the first-stage control uses direct current voltage control and adopts a feedforward double-closed loop decoupling control strategy to control, and the converter station in the second-stage control controls the flow direction of power and the balance of alternating current voltage through the feedforward decoupling control strategy and the phasing angle control. The control method can enable the weak alternating current system in the VSC direct current power grid to stably operate. The weak alternating current system applying the control strategy can stably connect a power feeding station and a power receiving station in the direct current system at the same time, and the alternating current system can carry a certain amount of alternating current load. The hierarchical control strategy provides a solution for multi-converter station control of a direct current power grid.
Description
Technical Field
The invention belongs to the field of parallel operation and operation of alternating-current and direct-current systems, the field of power grid planning and the field of power system simulation, and relates to a direct-current power grid, in particular to a direct-current power grid formed by a voltage source converter station and in which alternating-current and direct-current systems are connected in a mixed mode.
Background
With the improvement of the application technology of power electronic components, direct current transmission and a direct current power grid become important supplements of an alternating current power grid. Dc power transmission has been successfully operated in china for many years to deliver excess power in the middle and west to eastern coastal areas. Meanwhile, the extra-high voltage direct current transmission and the extra-high voltage alternating current transmission are used together to continuously transmit the wind power and the solar power in the west and the north to the load center in the east, so that important contribution is made to energy conservation and emission reduction of the country.
In urban distribution networks, most of the power transmission uses cables as medium due to limited space. In the transmission of alternating current cables with longer distance, the economy of adopting direct current transmission is better, and the direct current transmission occupies less space than the alternating current transmission. The direct current power grid of the voltage source converter station (voltage source converter, VSC) has great advantages in the aspect of integrating wind energy and solar energy, can enable wind energy and solar energy to generate electricity smoothly to be connected in, and can independently control active power and reactive power. In view of this, a VSC-based direct current network can be an important component of the energy internet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel control method for a VSC direct current power grid, which can improve the control stability of a system, in particular to the stability of a weak alternating current system directly powered by VSC inversion in a direct current power grid with more VSCs.
The technical scheme adopted for solving the technical problems is as follows:
a control method of a VSC direct current power grid defines that a first-stage control is adopted by the outermost converter station in the VSC direct current power grid, a second-stage control is defined that the converter station is connected with the first-stage converter station through a high-voltage direct current line, a weak alternating current power grid is connected to the alternating current side of the converter station in the second-stage control, the first-stage control uses direct current voltage control, a feedforward double-closed loop decoupling control strategy is adopted for control, and in the second-stage control, the converter station controls the flow direction of power and the balance of alternating current voltage through the feedforward decoupling control strategy and phasing angle control.
In the first-stage control, the direct-current voltage is controlled to input parameters to the inner ring through the outer ring PI control, active and reactive parameters are decoupled in the inner ring to obtain decoupled control signals, the parameters in the rotating rectangular coordinate system are converted into coordinate parameters of the three-phase alternating-current system through a dq- > abc calculation matrix, and the given direct-current side voltage is output by the converter station through the parameters to perform direct-current voltage control.
In the second-stage control, active power is controlled to input parameters to the inner ring through the outer ring PI control, active and reactive parameters are decoupled in the inner ring to obtain decoupled control signals, parameters in a rotary rectangular coordinate system are converted into coordinate parameters of a three-phase alternating current system through a dq- > abc calculation matrix, and a given active power is output by a converter station through the parameters to perform power control.
In the phase angle control, the converter station generates a three-phase ac control signal corresponding to the phase angle signal by a predetermined phase angle and signal generating means, and the converter station can output a voltage of a predetermined phase angle by the signal to perform phase angle control of the weak ac power grid.
In a direct current network including a weak alternating current system, a shortest path for connecting a converter station to a strong network is selected, and the control level of the converter station is defined as n+1-level control according to the number n of the converter stations separated between a certain converter station and the alternating current strong network.
Furthermore, the third-stage converter station is coupled to the second-stage control converter station via a weak ac power network.
The invention has the advantages and positive effects that:
1. the control method can enable the weak alternating current system in the VSC direct current power grid to stably operate. The weak alternating current system applying the control strategy can stably connect a power feeding station and a power receiving station in the direct current system at the same time, and the alternating current system can carry a certain amount of alternating current load. The hierarchical control strategy provides a solution for multi-converter station control of a direct current power grid.
2. The control method can enable the alternating voltage of the weak alternating current system connected with the power feeding station to have a high stabilizing speed, reduce the stabilizing balance time of the system and enable the whole direct current power transmission network to have good dynamic stability. Converter stations that deliver electrical energy to a weak ac power grid are referred to as "power feeders" and converter stations that absorb electrical energy from a weak ac power grid are referred to as "power receivers". The alternating current weak power grid in the direct current power grid is used for setting the control mode and the control scheme of the converter station connected with the weak power grid according to the distinction between the power feeding station and the power receiving station, so that the stability of the system can be improved.
3. With the control method, when the power of the weak alternating current system in the direct current power grid is increased, the power of the voltage control station of the weak alternating current power grid can be reliably reversed, so that the direct current power grid can provide more active power for the weak alternating current system. The direct current power grid can ensure that the middle weak alternating current system reliably operates when the power changes, and the balance station can accurately and timely meet the power change and stability requirements of the middle weak alternating current system.
Drawings
Fig. 1 is a control schematic of the present invention.
Detailed Description
The invention will now be described in further detail by way of specific examples, which are given by way of illustration only and not by way of limitation, with reference to the accompanying drawings.
VSC (Voltage source converter) straightThe control system comprises converter stations VSC1, VSC2, VSC3, VSC4, an alternating current strong power grid, a weak alternating current power grid, a filter in the weak alternating current power grid, a direct current transmission line, a decoupling control strategy, phase angle control (delta setting), active control (P), alternating current voltage control (U) rms ) And an upper hierarchical control strategy. The AC strong grid AC exchanges energy with the dc grid via the converter stations VSC1 and VSC 4. In the direct current network, a weak alternating current network is included, which exchanges energy with the direct current network via VSC2 and VSC 3. The converter station is controlled by a decoupling control strategy, the decoupling control strategy controls trigger pulses for the converter station by active control and phasing angle control, and the upper layer is controlled by the control quantity of the decoupling control strategy.
The converter station VSC1 and the converter station VSC4 are directly connected with the ac strong power grid, so that the VSC1 and the VSC4 belong to the first-stage control, the VSC2 is connected with the VSC1 through a direct-current cable, the other side of the VSC2 is connected with the ac weak power grid, and therefore the shortest path of the connection of the VSC2 and the ac strong power grid is connected with the strong power grid through the VSC1, namely the control level of the VSC2 is the second stage. Likewise, the control hierarchy of VSC3 is also the second level.
The power flows from VSC1 to VSC2 and then from VSC3 to VSC4, and the weak grid load between VSC2 and VSC3 consumes a small part of the alternating current power, and at the same time the alternating current weak grid inputs power to VSC 3.
The AC is an alternating-current strong power grid, the AC inputs alternating-current power to a converter station VSC1, the converter station VSC1 performs switching control through signals sent by a PWM signal generator, a trigger angle of the PWM signal generator is from a calculation matrix of 'dq- > abc', dq parameters are from improved feedforward decoupling control, an outer loop voltage PI control and control signals obtained from the AC alternating-current power grid are output to the improved feedforward decoupling control for calculation, and measured direct-current voltage values are compared with given direct-current voltage values and output to a PI controller of the outer loop voltage controller.
The VSC1 converts alternating current power of the AC into direct current power through direct current voltage control of a first stage and then transmits the direct current power to the VSC2, the VSC2 adopts fixed active power control, direct current is input to the VSC2, a converter station VSC2 carries out switch control through signals sent by a PWM signal generator, a trigger angle of the PWM signal generator is from a computing matrix of 'dq- > abc', dq parameters are from decoupling control with improved feedforward, outer ring active PI control and measurement signals obtained from an AC power grid are output to the improved feedforward decoupling control to be computed, and measured active power values are compared with given active power values and output to a PI controller of an outer ring voltage controller. The VSC2 converts the direct current power into alternating current power through fixed active power control and outputs the alternating current power to a weak alternating current system.
The system comprises a VSC3 and a weak alternating current system vector, wherein the VSC3 performs switching control operation through PWM control signals, the power of the weak alternating current system is converted into direct current power to be transmitted to a direct current power grid, the PWM control signals of the VSC3 are from a sinusoidal signal generator, the signals of the sinusoidal signal generator are from phasing angle delta control and given constant voltage control, and the signals of the constant voltage control are from the difference between a given voltage value and a voltage measured value.
The VSC4 converts direct current power into alternating current power and transmits the alternating current power to an alternating current power grid AC, the VSC4 performs switching control through signals sent by a PWM signal generator, the trigger angle of the PWM signal generator is from a calculation matrix of 'dq- > abc', the dq parameter is from decoupling control with improved feedforward, the outer loop voltage PI control and control signals from the AC power grid are output to the improved feedforward decoupling control for calculation, the measured direct current voltage value is compared with a given direct current voltage value, and the calculated direct current voltage value is output to a PI controller of the outer loop voltage controller.
The converter station VSC2 controls alternating voltage, the converter station VSC3 controls active power, the VSC2 generates starting pulse in a phased angle control mode to trigger the switching of a transistor, the VSC1 and the VSC4 are controlled by adopting constant direct voltage to control the first-stage direct voltage of the whole direct current power grid, the power transmission of the alternating current strong power grid and the direct current power grid is ensured, and the control of the converter station triggering pulse is performed through a feedforward decoupling control strategy.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that variations and modifications can be made without departing from the scope of the invention.
Claims (1)
1. A control method of a VSC direct current power grid is characterized by comprising the following steps: the control system comprises a converter station VSC1, VSC2, VSC3, VSC4, an alternating current strong power grid, a weak alternating current power grid, a filter in the weak alternating current power grid, a direct current transmission line, a decoupling control strategy, phase angle control, active control, alternating current voltage control and an upper hierarchical control strategy, wherein the alternating current strong power grid AC exchanges energy with the direct current power grid through the converter station VSC1 and the VSC4, the direct current power grid comprises a weak alternating current power grid, the weak alternating current power grid exchanges energy with the direct current power grid through the VSC2 and the VSC3, the converter station is controlled through the decoupling control strategy, the active control and the phasing angle control are used for controlling trigger pulses for the converter station, and the upper hierarchical control is used for controlling the quantity of the decoupling control strategy;
the converter station VSC1 and the converter station VSC4 are directly connected with an alternating current strong power grid, the VSC1 and the VSC4 belong to first-stage control, the VSC2 is connected with the VSC1 through a direct current cable, the other side of the VSC2 is connected with an alternating current weak power grid, the control level of the VSC2 is a second stage, and the control level of the VSC3 is also the second stage;
the power flows from the VSC1 to the VSC2, and then flows from the VSC3 to the VSC4, a small part of alternating current power is consumed by a weak current network load between the VSC2 and the VSC3, and meanwhile, the alternating current weak current network inputs power to the VSC 3;
the AC is an alternating-current strong power grid, the AC inputs alternating-current power to a converter station VSC1, the converter station VSC1 performs switching control through signals sent by a PWM signal generator, a trigger angle of the PWM signal generator is from a calculation matrix of 'dq- > abc', dq parameters are from improved feedforward decoupling control, an outer loop voltage PI control and control signals obtained from the AC alternating-current power grid are output to the improved feedforward decoupling control for calculation, a measured direct-current voltage value is compared with a given direct-current voltage value, and the calculated direct-current voltage value is output to a PI controller of an outer loop voltage controller;
the method comprises the steps that VSC1 converts alternating current power of an AC into direct current power through direct current voltage control of a first stage, then the direct current power is transmitted to VSC2, the VSC2 adopts fixed active power control, direct current is input to the VSC2, a converter station VSC2 performs switching control through signals sent by a PWM signal generator, a trigger angle of the PWM signal generator is from a dq- > abc calculation matrix, dq parameters are from improved feedforward decoupling control, outer loop active PI control and measurement signals obtained from an AC power grid are output to the improved feedforward decoupling control for calculation, measured active power values are compared with given active power values, the output is output to a PI controller of an outer loop voltage controller, and the VSC2 converts the direct current power into alternating current power through fixed active power control and outputs the alternating current power to a weak alternating current system;
the system comprises a VSC3 and a weak alternating current system vector, wherein the VSC3 performs switching control operation through PWM control signals, the power of the weak alternating current system is converted into direct current power to be transmitted to a direct current power grid, the PWM control signals of the VSC3 are from a sinusoidal signal generator, the signals of the sinusoidal signal generator are from phasing angle delta control and given constant voltage control, and the signals of the constant voltage control are from the difference between a given voltage value and a voltage measurement value;
the VSC4 converts direct current power into alternating current power and transmits the alternating current power to an alternating current power grid AC, the VSC4 performs switching control through signals sent by a PWM signal generator, a trigger angle of the PWM signal generator is from a dq- > abc calculation matrix, dq parameters are from feedforward decoupling control improved, an outer loop voltage PI control and control signals obtained from the AC power grid are output to feedforward decoupling control improved to be calculated, a measured direct current voltage value is compared with a given direct current voltage value, and the calculated direct current voltage value is output to a PI controller of an outer loop voltage controller;
the method comprises the steps that a converter station VSC2 controls alternating voltage, a converter station VSC3 controls active power, the VSC2 generates starting pulses in a phased angle control mode to trigger switching of transistors, VSC1 and VSC4 control the first-stage direct voltage of the whole direct current power grid in a fixed direct current voltage mode, power transmission of an alternating current strong power grid and the direct current power grid is guaranteed, and control of converter station triggering pulses is conducted through a feedforward decoupling control strategy;
defining a first-stage control as a control adopted by the outermost converter station in the VSC direct-current power grid, defining a second-stage control as a converter station connected with the first-stage converter station through a high-voltage direct-current line, wherein the alternating-current side of the converter station in the second-stage control is connected with a weak alternating-current power grid, the first-stage control uses direct-current voltage control and adopts a feedforward double-closed-loop decoupling control strategy to control, and the converter station in the second-stage control controls the flow direction of power and the balance of alternating-current voltage through the feedforward decoupling control strategy and the phasing angle control;
in the first-stage control, direct-current voltage is controlled to input parameters to an inner ring through an outer ring PI control, active and reactive parameters are decoupled in the inner ring to obtain decoupled control signals, parameters in a rotating rectangular coordinate system are converted into coordinate parameters of a three-phase alternating-current system through a dq- > abc calculation matrix, and a given direct-current side voltage is output by a converter station through the parameters to perform direct-current voltage control;
in the second-stage control, active power is controlled to input parameters to an inner ring through an outer ring PI control, active and reactive parameters are decoupled in the inner ring to obtain a decoupled control signal, parameters in a rotary rectangular coordinate system are converted into coordinate parameters of a three-phase alternating current system through a dq-abc calculation matrix, and a converter station outputs given active power through the parameters to perform power control;
in the phase angle control, the converter station generates a three-phase alternating current control signal corresponding to a phase angle signal through a given phase angle and a signal generating device, and can output a voltage with a given phase angle through the signal to perform phase angle control of a weak alternating current power grid;
selecting the shortest path of a converter station connected to a strong power grid in a direct current power grid containing a weak alternating current system, and defining the control level of the converter station as n+1 level control according to the number n of the converter stations separated between a certain converter station and the alternating current strong power grid;
the third-stage converter station is coupled to the second-stage control converter station via a weak ac power network.
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