CN104104094A - Chained static var generator (SVG) control algorithm with network voltage phase correction - Google Patents
Chained static var generator (SVG) control algorithm with network voltage phase correction Download PDFInfo
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Abstract
The invention discloses a chained static var generator (SVG) control algorithm with network voltage phase correction. Before operation, network voltage is subjected to phase correction, time delay caused by signal sampling, control computing, insulated gate bipolar translator (IGBT) turning on and the like can be avoided, meanwhile, disturbance of network voltage can be overcome by introduction of network voltage feedforward control, moreover, reactive current is tracked by the aid of repetitive learning control, and by means of a direct voltage balance control algorithm, active current required by direct current capacitor voltage stabilization can be obtained on one hand and direct current side voltage of each H bridge can be balanced on the other hand.
Description
Technical field
The invention belongs to power domain, relate to a kind of quality of power supply device that voltage source inversion transformation technique can be realized leading or hysteresis reactive power compensation that passes through being applied in electric power system; Particularly relate to a kind of static reacance generator SVG based on IGBT chain inverter, can be widely used in all kinds of electric power systems.
Background technology
Along with the raising of social industrialized level, more and more high-power, non-linear equipment enters electrical network, and the quality of power supply that it brings is polluted also more and more serious.On the other hand, along with increasing of accurate electric energy user in electrical network, require electrical network that the electric energy adapting with the desired quality index of user must be provided.Therefore accurate electric energy user and power quality problem this contradiction is progressively risen to principal contradiction.Power quality problem is especially with idle the most serious with harmonic problem, and the harm that they cause electrical network is mainly reflected in the following aspects:
The increase of reactive power, can cause apparent power to increase sum current and increase, thereby place capacity in electrical network is increased.Meanwhile, the capacity of the startup of power consumer and control appliance, measuring instrument also will strengthen; The increase of reactive power increases total current, thereby the loss of equipment and circuit is increased; Reactive power also can make the voltage drop of circuit and transformer increase, if impact load also can make voltage big ups and downs; Reactive power can cause that power factor declines, and power supplying efficiency is reduced, and grid loss increases, and has caused the economic loss of power supply department, also makes user's the electricity charge (fine that comprises power supply department) increase; Harmonic wave makes the equipment in electrical network produce additional harmonic loss, thereby reduces the service efficiency of generating, transmission of electricity and power consumption equipment; Harmonic wave produces extra thermal effect, thereby causes power consumption equipment (electric rotating machine, capacitor, transformer) heating, makes ageing of insulation, reduces the useful life of equipment, even destroyed; Harmonic wave causes electrical measuring instrument metering inaccurate, and nearby electron equipment and communication system are produced to interference, also can cause some protection equipment malfunctions works, as relaying protection, fuse etc.; Greatly increase the possibility of system resonance.Harmonic wave easily makes, between electrical network and compensation condenser, in parallel or series resonance occurs, and makes even decades of times of several times of amplified harmonic currents, causes overcurrent, causes the damage of capacitor, the reactor being attached thereto and resistor.
Normal parallel connection type passive filter, the silent oscillation dynamic passive compensation SVC device of adopting suppresses harmonic wave, compensating reactive power at present, but exist the response time long, aluminium foil ability, electric energy loss be large, easily and the critical defect such as network system generation resonance, floor space is large.Yet, traditional reactive power compensator is if electrostatic condenser in parallel is owing to using mechanical switch, adjusting function is poor, do not possess rapidity, repeatability and successional feature, thereby can not realize and correct in short-term the function that voltage raises or lands, it is helpless that the compensation of impact load or burden without work also seems.
Static reacance generator based on voltage source inversion transformation technique (SVG), as forward position and the developing direction of dynamic reactive regulation technology, is current study hotspot both domestic and external.The topological structure of the current power distribution network dynamic reactive adjusting main separation because its outstanding advantages becomes of the chain type SVG device based on the cascade of chain type H bridge inversion unit.Direct hanging type chain type SVG device, in its control method, current tracking is controlled and is conventionally adopted PI to control, or feedback decoupling control, but reckons without the impact of line voltage time delay on control system.The control of H bridge DC side realizes the control of direct voltage by additional-energy conversion circuit, its shortcoming is that power cell circuit is complicated, and device operation efficiency is low.Also there is the PI control that directly each H bridge inversion unit is realized independent direct voltage, or out of phase three H bridge inversion units are combined and realize the tracking control of direct voltage, but these voltage control methods have all been ignored the interaction between H bridge inversion unit, and the adjustment time of control system is long, control difficult parameters to adjust.
Summary of the invention:
The invention discloses a kind of chain type SVG control algolithm of proofreading and correct with electric network voltage phase, before computing, line voltage is carried out to phasing, avoided the time delay producing because of factors such as signal sampling, control are calculated, IGBT opens, introduce voltage feed-forward control simultaneously and control the disturbance that overcomes line voltage, adopt in addition repetitive study control to follow the tracks of reactive current, adopt voltage balance control algorithm, obtained on the one hand the required active current of DC capacitor voltage stabilizing, on the one hand balance each H bridge DC side voltage.
To achieve these goals, the present invention is achieved through the following technical solutions:
Based on power current inverter, take voltage source inverter as core, DC side adopts DC capacitor for energy-storage travelling wave tube is to provide voltage support.In when operation, be equivalent to all adjustable three-phase alternating-current supplies of voltage, phase place and an amplitude.The normal operation of inverter depends on the voltage support of DC side, when inverter incoming transport power supply, by the reverse fly-wheel diode of each IGBT, forms rectifier, and direct current capacitor is charged; After normal operation, the energy storage of direct current capacitor will be used for meeting the internal loss of inverter, and capacitance voltage can decline, and must constantly to capacitor charging complementary energy, make voltage remain on working range.By very little angle of inverter output voltage delay system voltage is realized, inverter absorbs a small amount of meritorious its internal loss that meets from system, keeps voltage levvl.Change the amplitude of inverter output voltage, reach and send or absorb idle object.The control method of whole system comprises following content:
1, the reactive current track algorithm based on repetitive study control
The first step: determine load-side electric current according to the system side electric current detecting and SVG output current;
Second step: the load current obtaining is obtained to referenced reactive current through the p-q algorithm based on instantaneous reactive power theory;
The 3rd step: by referenced reactive current value with SVG output current to be detected poor, acquisition electric current difference, carries out repetitive study control by electric current difference by repetitive study control device, acquisition reactive current modulation signal;
2, with the fundamental voltage feedfoward control algorithm of phasing
The first step: according to the three phase network fundamental voltage detecting
being multiplied by coefficient k 1 obtains and the equidirectional component of fundamental voltage;
Second step: the vertical vector that calculates each phase fundamental voltage according to the three phase network voltage detecting
with the coefficient k 2 acquisition vertical component that multiplies each other;
The 3rd step: the vertical component that the component in the same way that the first step is obtained and second step obtain is added, obtains the fundamental voltage feedforward modulation signal after proofreading and correct;
3, DC voltage control algorithm
The first step: detect the DC voltage (chain type SVG main circuit is every to be consisted of the cascade of a plurality of H bridge, and setting number is N) of N H bridge power unit of three-phase, and the mean value in a power frequency period of recursion calculating, obtain
Second step: the DC voltage obtaining according to the first step, then ask the mean value of single-phase N unit, obtain
The 3rd step: the A of take is example mutually, obtains second step
as command value, the first step obtains
as sampled value, carry out PI adjusting, obtain the instruction of SVG active current amplitude, B, C are similar.
The 4th step: the three phase network voltage (fundamental voltage feedforward modulation signal) after the correction obtaining according to the fundamental voltage feedfoward control algorithm with phasing
the vertical vector of each phase fundamental voltage after calculation correction
The 5th step: the active current amplitude that after the correction that the 4th step is obtained, the vertical vector of each phase fundamental voltage and the 3rd step obtain multiplies each other and obtains active current modulation signal.
4 systems are controlled
The first step: detection system side three-phase voltage and three-phase current, SVG output current;
Second step: 2 kinds of current value computational load side electric currents that detect according to the first step, and obtain referenced reactive current through the p-q algorithm based on instantaneous reactive power theory;
The 3rd step: referenced reactive current and SVG output current value are compared, and by electric current difference process repetitive study control, obtain reactive current modulation signal;
The 4th step: obtain the fundamental voltage feedforward modulation signal after proofreading and correct by the fundamental voltage feedfoward control algorithm with phasing according to the three-phase system side group wave voltage detecting;
The 5th step: detect the DC voltage of N H bridge power unit of three-phase, by as 3) the DC voltage control algorithm acquisition active current modulation signal as shown in;
The 6th step: reactive current modulation signal, fundamental voltage feedforward modulation signal, active current modulation signal are added, obtain each phase modulation signal of chain type SVG;
The 7th step: by each mutually required modulation signal of SVG, control the required pwm control signal of each phase brachium pontis switching tube of controlled SVG through one pole frequency multiplication phase-shifting carrier wave.
Compared with prior art, remarkable advantage of the present invention is: before computing, line voltage is carried out to phasing, avoided the time delay producing because of factors such as signal sampling, control are calculated, IGBT opens, introduce voltage feed-forward control simultaneously and control the disturbance that overcomes line voltage, adopt in addition repetitive study control to follow the tracks of reactive current, adopt voltage balance control algorithm, obtained on the one hand the required active current of DC capacitor voltage stabilizing, on the one hand balance each H bridge DC side voltage.
Accompanying drawing explanation:
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is p, the q reactive current direct-detection algorithm principle block diagram that the present invention is based on idle theory;
Fig. 3 is the reactive current track algorithm block diagram that the present invention is based on repetitive study control;
Fig. 4 is the fundamental voltage feedfoward control algorithm block diagram of band phasing of the present invention;
Fig. 5 is the grid-connected figure that affects on the phase place of line voltage of the present invention;
Fig. 6 is power unit direct voltage control algolithm block diagram of the present invention;
Fig. 7 is system control block diagram of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, concrete technical scheme of the present invention is described in further detail.
See Fig. 1, a kind of 10kV high-voltage static var generator SVG, main circuit adopts three-phase star connection,, main circuit isolated neutral.Each connects by a plurality of H bridge inversion unit cascades, and each storage capacitor is given a H bridge inversion unit power supply, and final output voltage is by the stack of a plurality of H bridge inversion unit output voltages.A plurality of power cells of every phase cascade, by high voltage connector 3KM1, linked reactor L and the grid-connected circuit breaker series connection of High-voltage Incoming Cabinet connecting system, wherein charging resistor 3R is in parallel with high voltage connector 3KM1.SVG is when holding state, and the grid-connected circuit breaker Q F of High-voltage Incoming Cabinet and high voltage connector 3KM1 are in off-state.When system is grid-connected, closed grid-connected circuit breaker Q F, electrical network charges to power cell by reactor L and charging resistor, closed high contactor 3KM1 when charging finishes, system starts to be incorporated into the power networks.
SVG main control part adopts double T IDSP+AlteraFPGA chip, completes pq computing reactive current, fundamental voltage control, Boost repetitive study control, DC voltage control in FPGA.Peripheral circuit mainly comprises digital quantity input/output circuitry, analog signal conditioner circuit, Ethernet communication circuit etc., in DSP, complete various protections and with the functions such as PLC communication.
1) the reactive current track algorithm based on repetitive study control
See Fig. 2, the p based on idle theory, q reactive current direct-detection algorithm;
See Fig. 3, the reactive current track algorithm block diagram based on repetitive study control, traditional repetitive controller, the delay link on forward path makes the controlled quentity controlled variable in this cycle just can be embodied in next cycle.Repetitive controller is directly connected on the forward path of control system, so when load changing, because controlled quentity controlled variable embodied in next cycle, thereby controller is restricted the tracking of instruction.Repetitive controller can be brought into play better effect in stable situation and while being input as periodic signal, therefore repeating to increase FEEDBACK CONTROL on the basis of controlling, and its object is to meet stability of a system condition, and accelerates the response speed of system.
2) with the fundamental voltage feedfoward control algorithm of phasing
See that Fig. 4 is the fundamental voltage feedfoward control algorithm block diagram with phasing, line voltage has impact to grid-connected current, for phase place, also has certain lagging influence as Fig. 5.Here adopt voltage feed-forward control to control to offset the impact of line voltage on grid-connected current.Take suitable feedfoward control, can make line voltage be kept to zero to the impact of grid-connected current.In fact feedfoward control is exactly by adopting the mode of open loop control to remove compensating disturbance signal, it can not change the characteristic of control system, if can overcome the disturbance of line voltage by feedfoward control, so just can reduce greatly current command signal, alleviate the burden of current regulator.
The first step: according to the three phase network fundamental voltage detecting
being multiplied by the first COEFFICIENT K 1 obtains and the equidirectional component of fundamental voltage;
Second step: Fig. 5 is known
with
vertically,
vector is similar, calculates the vertical vector of each phase fundamental voltage according to the three phase network voltage detecting
consider sampling time delay, control computation delay, pwm signal issues the factors such as time delay, by itself and the COEFFICIENT K 2 acquisition vertical component that multiplies each other;
The 3rd step: the vertical component that the component in the same way that the first step is obtained and second step obtain is added, obtains the fundamental voltage feedforward modulation signal after proofreading and correct;
3) DC voltage control algorithm
In the process of actual motion, active loss always exists chain type SVG device, comprise the loss of linked reactor and tandem type, mixed type and the parallel connection type loss etc. of H bridge inversion unit self, and these losses are all directly or indirectly subject to the impact of device offset current size, so DC side need to absorb a part of the stable of DC voltage of gaining merit to maintain from electrical network.Existence due to element characteristics difference simultaneously also makes direct voltage between unit also there will be seriously unbalanced.In order to realize the stable and balance of DC voltage, see Fig. 6, power unit direct voltage control algolithm implementation procedure:
The first step: detect the DC voltage of N H bridge power unit of three-phase, and the mean value in a power frequency period of recursion calculating, obtain
Second step: the DC voltage obtaining according to the first step, then ask the mean value of single-phase N unit, obtain
The 3rd step: the A of take is example mutually, obtains second step
as command value, the first step obtains
as sampled value, carry out PI adjusting, obtain the instruction of SVG active current amplitude, B, C are similar.
The 4th step: the three phase network voltage after the correction obtaining according to the fundamental voltage feedfoward control algorithm with phasing
the vertical vector of each phase fundamental voltage after calculation correction
The 5th step: the active current amplitude that after the correction that the 4th step is obtained, the vertical vector of each phase fundamental voltage and the 3rd step obtain multiplies each other and obtains active current modulation signal.
4) see Fig. 7, system is controlled:
The first step: detection system side three-phase voltage and three-phase current, SVG output current;
Second step: 2 kinds of current value computational load side electric currents that detect according to the first step, and obtain referenced reactive current through the p-q algorithm based on instantaneous reactive power theory;
The 3rd step: referenced reactive current and SVG output current value are compared, and by electric current difference process repetitive study control, obtain reactive current modulation signal;
The 4th step: obtain the fundamental voltage feedforward modulation signal after proofreading and correct by the fundamental voltage feedfoward control algorithm with phasing according to the three-phase system side group wave voltage detecting;
The 5th step: detect the DC voltage of N H bridge power unit of three-phase, by as 3) the DC voltage control algorithm acquisition active current modulation signal as shown in;
The 6th step: reactive current modulation signal, fundamental voltage feedforward modulation signal, active current modulation signal are added, obtain each phase PWM modulation signal of chain type SVG;
The 7th step: by each mutually required modulation signal of SVG, control the required pwm control signal of each phase brachium pontis switching tube of controlled SVG through one pole frequency multiplication phase-shifting carrier wave.
The above; it is only preferably embodiment of the present invention; protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, can apparently obtain the simple change of technical scheme or equivalence and replace and all fall within the scope of protection of the present invention.
Claims (4)
1. a chain type SVG control method of proofreading and correct with electric network voltage phase, for line voltage is carried out to phasing, described method realizes the accurate tracking of reactive current, and maintains the equilibrium that each power cell direct current is surveyed voltage, it is characterized in that, said method comprising the steps of:
1) the reactive current track algorithm based on based on repetitive study control obtains reactive current modulation signal;
2) the fundamental voltage feedfoward control algorithm based on phasing obtains the fundamental voltage feedforward modulation signal after proofreading and correct;
3) based on DC voltage control algorithm, obtain active current modulation signal;
4) reactive current modulation signal, fundamental voltage feedforward modulation signal, active current modulation signal are added, obtain each phase modulation signal of chain type SVG;
5) by each mutually required modulation signal of SVG, through one pole frequency multiplication phase-shifting carrier wave, control the required pwm control signal of each phase brachium pontis switching tube of controlled SVG.
2. control method according to claim 1, is characterized in that, described step 1) specifically comprise:
11): according to the system side electric current detecting and SVG output current, determine load-side electric current;
12): the load current obtaining is obtained to referenced reactive current through the p-q algorithm based on instantaneous reactive power theory;
13): by referenced reactive current value with SVG output current to be detected poor, acquisition electric current difference, carries out repetitive study control by electric current difference by repetitive study control device, acquisition reactive current modulation signal.
3. control method according to claim 1, is characterized in that, described step 2) specifically comprise:
21): according to the three phase network fundamental voltage detecting
being multiplied by coefficient k 1 obtains and the equidirectional component of fundamental voltage;
22): the vertical vector that calculates each phase fundamental voltage according to the three phase network voltage detecting
with the coefficient k 2 acquisition vertical component that multiplies each other;
23): the vertical component that the component in the same way that the first step is obtained and second step obtain is added, obtain the fundamental voltage feedforward modulation signal after proofreading and correct.
4. control method according to claim 1, is characterized in that, described step 3) specifically comprise:
31): detect the DC voltage of N H bridge power unit of three-phase, and the mean value in a power frequency period of recursion calculating, obtain
32) DC voltage: according to step 31) obtaining, then ask the mean value of single-phase N unit, obtain
33): the A of take is example mutually, by step 32) obtain
as command value, the first step obtains
as sampled value, carry out PI adjusting, obtain the instruction of SVG active current amplitude, B, C are similar;
34): the fundamental voltage feedforward modulation signal after the correction obtaining according to the fundamental voltage feedfoward control algorithm with phasing
the vertical vector of each phase fundamental voltage after calculation correction
35) vertical vector and the step 33 of each phase fundamental voltage after the correction: by step 34) obtaining) current amplitude multiplies each other and obtains active current modulation signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107359621A (en) * | 2017-08-22 | 2017-11-17 | 武汉合康智能电气有限公司 | A kind of DC voltage-stabilizing method and system of charging module APFC |
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| JPS54162143A (en) * | 1978-06-14 | 1979-12-22 | Hitachi Ltd | Reactive-power controller |
| CN203632255U (en) * | 2013-12-11 | 2014-06-04 | 哈尔滨理工大学 | Three-phase static var generator based on Z source network |
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| CN107359621A (en) * | 2017-08-22 | 2017-11-17 | 武汉合康智能电气有限公司 | A kind of DC voltage-stabilizing method and system of charging module APFC |
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